17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * This file is derived from various .h and .c files from the zlib-0.95
37c478bd9Sstevel@tonic-gate * distribution by Jean-loup Gailly and Mark Adler, with some additions
47c478bd9Sstevel@tonic-gate * by Paul Mackerras to aid in implementing Deflate compression and
57c478bd9Sstevel@tonic-gate * decompression for PPP packets. See zlib.h for conditions of
67c478bd9Sstevel@tonic-gate * distribution and use.
77c478bd9Sstevel@tonic-gate *
87c478bd9Sstevel@tonic-gate * Changes that have been made include:
97c478bd9Sstevel@tonic-gate * - changed functions not used outside this file to "local"
107c478bd9Sstevel@tonic-gate * - added minCompression parameter to deflateInit2
117c478bd9Sstevel@tonic-gate * - added Z_PACKET_FLUSH (see zlib.h for details)
127c478bd9Sstevel@tonic-gate * - added inflateIncomp
137c478bd9Sstevel@tonic-gate *
147c478bd9Sstevel@tonic-gate * $Id: zlib.c,v 1.2 1999/04/01 07:26:30 paulus Exp $
157c478bd9Sstevel@tonic-gate */
167c478bd9Sstevel@tonic-gate
177c478bd9Sstevel@tonic-gate
187c478bd9Sstevel@tonic-gate /*+++++*/
197c478bd9Sstevel@tonic-gate /* zutil.h -- internal interface and configuration of the compression library
207c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Jean-loup Gailly.
217c478bd9Sstevel@tonic-gate * For conditions of distribution and use, see copyright notice in zlib.h
227c478bd9Sstevel@tonic-gate */
237c478bd9Sstevel@tonic-gate
247c478bd9Sstevel@tonic-gate /* WARNING: this file should *not* be used by applications. It is
257c478bd9Sstevel@tonic-gate part of the implementation of the compression library and is
267c478bd9Sstevel@tonic-gate subject to change. Applications should only use zlib.h.
277c478bd9Sstevel@tonic-gate */
287c478bd9Sstevel@tonic-gate
297c478bd9Sstevel@tonic-gate /* From: zutil.h,v 1.9 1995/05/03 17:27:12 jloup Exp */
307c478bd9Sstevel@tonic-gate
317c478bd9Sstevel@tonic-gate #define _Z_UTIL_H
327c478bd9Sstevel@tonic-gate
337c478bd9Sstevel@tonic-gate #include "zlib.h"
347c478bd9Sstevel@tonic-gate
357c478bd9Sstevel@tonic-gate #ifdef STDC
367c478bd9Sstevel@tonic-gate # include <string.h>
377c478bd9Sstevel@tonic-gate #endif
387c478bd9Sstevel@tonic-gate
397c478bd9Sstevel@tonic-gate #ifndef local
407c478bd9Sstevel@tonic-gate # define local static
417c478bd9Sstevel@tonic-gate #endif
427c478bd9Sstevel@tonic-gate /* compile with -Dlocal if your debugger can't find static symbols */
437c478bd9Sstevel@tonic-gate
447c478bd9Sstevel@tonic-gate #define FAR
457c478bd9Sstevel@tonic-gate
467c478bd9Sstevel@tonic-gate typedef unsigned char uch;
477c478bd9Sstevel@tonic-gate typedef uch FAR uchf;
487c478bd9Sstevel@tonic-gate typedef unsigned short ush;
497c478bd9Sstevel@tonic-gate typedef ush FAR ushf;
507c478bd9Sstevel@tonic-gate typedef unsigned long ulg;
517c478bd9Sstevel@tonic-gate
527c478bd9Sstevel@tonic-gate extern char *z_errmsg[]; /* indexed by 1-zlib_error */
537c478bd9Sstevel@tonic-gate
547c478bd9Sstevel@tonic-gate #define ERR_RETURN(strm,err) return (strm->msg=z_errmsg[1-err], err)
557c478bd9Sstevel@tonic-gate /* To be used only when the state is known to be valid */
567c478bd9Sstevel@tonic-gate
577c478bd9Sstevel@tonic-gate #ifndef NULL
587c478bd9Sstevel@tonic-gate #define NULL ((void *) 0)
597c478bd9Sstevel@tonic-gate #endif
607c478bd9Sstevel@tonic-gate
617c478bd9Sstevel@tonic-gate /* common constants */
627c478bd9Sstevel@tonic-gate
637c478bd9Sstevel@tonic-gate #define DEFLATED 8
647c478bd9Sstevel@tonic-gate
657c478bd9Sstevel@tonic-gate #ifndef DEF_WBITS
667c478bd9Sstevel@tonic-gate # define DEF_WBITS MAX_WBITS
677c478bd9Sstevel@tonic-gate #endif
687c478bd9Sstevel@tonic-gate /* default windowBits for decompression. MAX_WBITS is for compression only */
697c478bd9Sstevel@tonic-gate
707c478bd9Sstevel@tonic-gate #if MAX_MEM_LEVEL >= 8
717c478bd9Sstevel@tonic-gate # define DEF_MEM_LEVEL 8
727c478bd9Sstevel@tonic-gate #else
737c478bd9Sstevel@tonic-gate # define DEF_MEM_LEVEL MAX_MEM_LEVEL
747c478bd9Sstevel@tonic-gate #endif
757c478bd9Sstevel@tonic-gate /* default memLevel */
767c478bd9Sstevel@tonic-gate
777c478bd9Sstevel@tonic-gate #define STORED_BLOCK 0
787c478bd9Sstevel@tonic-gate #define STATIC_TREES 1
797c478bd9Sstevel@tonic-gate #define DYN_TREES 2
807c478bd9Sstevel@tonic-gate /* The three kinds of block type */
817c478bd9Sstevel@tonic-gate
827c478bd9Sstevel@tonic-gate #define MIN_MATCH 3
837c478bd9Sstevel@tonic-gate #define MAX_MATCH 258
847c478bd9Sstevel@tonic-gate /* The minimum and maximum match lengths */
857c478bd9Sstevel@tonic-gate
867c478bd9Sstevel@tonic-gate /* functions */
877c478bd9Sstevel@tonic-gate
887c478bd9Sstevel@tonic-gate #if defined(STDC) && !defined(HAVE_MEMCPY) && !defined(NO_MEMCPY)
897c478bd9Sstevel@tonic-gate # define HAVE_MEMCPY
907c478bd9Sstevel@tonic-gate #endif
917c478bd9Sstevel@tonic-gate #ifdef HAVE_MEMCPY
927c478bd9Sstevel@tonic-gate # define zmemcpy memcpy
937c478bd9Sstevel@tonic-gate # define zmemzero(dest, len) memset(dest, 0, len)
947c478bd9Sstevel@tonic-gate #else
957c478bd9Sstevel@tonic-gate # define zmemcpy(d, s, n) bcopy((s), (d), (n))
967c478bd9Sstevel@tonic-gate # define zmemzero bzero
977c478bd9Sstevel@tonic-gate #endif
987c478bd9Sstevel@tonic-gate
997c478bd9Sstevel@tonic-gate /* Diagnostic functions */
1007c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
1017c478bd9Sstevel@tonic-gate # include <stdio.h>
1027c478bd9Sstevel@tonic-gate # ifndef verbose
1037c478bd9Sstevel@tonic-gate # define verbose 0
1047c478bd9Sstevel@tonic-gate # endif
1057c478bd9Sstevel@tonic-gate # define Assert(cond,msg) {if(!(cond)) z_error(msg);}
1067c478bd9Sstevel@tonic-gate # define Trace(x) fprintf x
1077c478bd9Sstevel@tonic-gate # define Tracev(x) {if (verbose) fprintf x ;}
1087c478bd9Sstevel@tonic-gate # define Tracevv(x) {if (verbose>1) fprintf x ;}
1097c478bd9Sstevel@tonic-gate # define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
1107c478bd9Sstevel@tonic-gate # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
1117c478bd9Sstevel@tonic-gate #else
1127c478bd9Sstevel@tonic-gate # define Assert(cond,msg)
1137c478bd9Sstevel@tonic-gate # define Trace(x)
1147c478bd9Sstevel@tonic-gate # define Tracev(x)
1157c478bd9Sstevel@tonic-gate # define Tracevv(x)
1167c478bd9Sstevel@tonic-gate # define Tracec(c,x)
1177c478bd9Sstevel@tonic-gate # define Tracecv(c,x)
1187c478bd9Sstevel@tonic-gate #endif
1197c478bd9Sstevel@tonic-gate
1207c478bd9Sstevel@tonic-gate
1217c478bd9Sstevel@tonic-gate typedef uLong (*check_func) OF((uLong check, Bytef *buf, uInt len));
1227c478bd9Sstevel@tonic-gate
1237c478bd9Sstevel@tonic-gate /* voidpf zcalloc OF((voidpf opaque, unsigned items, unsigned size)); */
1247c478bd9Sstevel@tonic-gate /* void zcfree OF((voidpf opaque, voidpf ptr)); */
1257c478bd9Sstevel@tonic-gate
1267c478bd9Sstevel@tonic-gate #define ZALLOC(strm, items, size) \
1277c478bd9Sstevel@tonic-gate (*((strm)->zalloc))((strm)->opaque, (items), (size))
1287c478bd9Sstevel@tonic-gate #define ZFREE(strm, addr, size) \
1297c478bd9Sstevel@tonic-gate (*((strm)->zfree))((strm)->opaque, (voidpf)(addr), (size))
1307c478bd9Sstevel@tonic-gate #define TRY_FREE(s, p, n) {if (p) ZFREE(s, p, n);}
1317c478bd9Sstevel@tonic-gate
1327c478bd9Sstevel@tonic-gate /* deflate.h -- internal compression state
1337c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Jean-loup Gailly
134*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
1357c478bd9Sstevel@tonic-gate */
1367c478bd9Sstevel@tonic-gate
1377c478bd9Sstevel@tonic-gate /* WARNING: this file should *not* be used by applications. It is
1387c478bd9Sstevel@tonic-gate part of the implementation of the compression library and is
1397c478bd9Sstevel@tonic-gate subject to change. Applications should only use zlib.h.
1407c478bd9Sstevel@tonic-gate */
1417c478bd9Sstevel@tonic-gate
1427c478bd9Sstevel@tonic-gate
1437c478bd9Sstevel@tonic-gate /*+++++*/
1447c478bd9Sstevel@tonic-gate /* From: deflate.h,v 1.5 1995/05/03 17:27:09 jloup Exp */
1457c478bd9Sstevel@tonic-gate
1467c478bd9Sstevel@tonic-gate /* ===========================================================================
1477c478bd9Sstevel@tonic-gate * Internal compression state.
1487c478bd9Sstevel@tonic-gate */
1497c478bd9Sstevel@tonic-gate
1507c478bd9Sstevel@tonic-gate /* Data type */
1517c478bd9Sstevel@tonic-gate #define BINARY 0
1527c478bd9Sstevel@tonic-gate #define ASCII 1
1537c478bd9Sstevel@tonic-gate #define UNKNOWN 2
1547c478bd9Sstevel@tonic-gate
1557c478bd9Sstevel@tonic-gate #define LENGTH_CODES 29
1567c478bd9Sstevel@tonic-gate /* number of length codes, not counting the special END_BLOCK code */
1577c478bd9Sstevel@tonic-gate
1587c478bd9Sstevel@tonic-gate #define LITERALS 256
1597c478bd9Sstevel@tonic-gate /* number of literal bytes 0..255 */
1607c478bd9Sstevel@tonic-gate
1617c478bd9Sstevel@tonic-gate #define L_CODES (LITERALS+1+LENGTH_CODES)
1627c478bd9Sstevel@tonic-gate /* number of Literal or Length codes, including the END_BLOCK code */
1637c478bd9Sstevel@tonic-gate
1647c478bd9Sstevel@tonic-gate #define D_CODES 30
1657c478bd9Sstevel@tonic-gate /* number of distance codes */
1667c478bd9Sstevel@tonic-gate
1677c478bd9Sstevel@tonic-gate #define BL_CODES 19
1687c478bd9Sstevel@tonic-gate /* number of codes used to transfer the bit lengths */
1697c478bd9Sstevel@tonic-gate
1707c478bd9Sstevel@tonic-gate #define HEAP_SIZE (2*L_CODES+1)
1717c478bd9Sstevel@tonic-gate /* maximum heap size */
1727c478bd9Sstevel@tonic-gate
1737c478bd9Sstevel@tonic-gate #define MAX_BITS 15
1747c478bd9Sstevel@tonic-gate /* All codes must not exceed MAX_BITS bits */
1757c478bd9Sstevel@tonic-gate
1767c478bd9Sstevel@tonic-gate #define INIT_STATE 42
1777c478bd9Sstevel@tonic-gate #define BUSY_STATE 113
1787c478bd9Sstevel@tonic-gate #define FLUSH_STATE 124
1797c478bd9Sstevel@tonic-gate #define FINISH_STATE 666
1807c478bd9Sstevel@tonic-gate /* Stream status */
1817c478bd9Sstevel@tonic-gate
1827c478bd9Sstevel@tonic-gate
1837c478bd9Sstevel@tonic-gate /* Data structure describing a single value and its code string. */
1847c478bd9Sstevel@tonic-gate typedef struct ct_data_s {
1857c478bd9Sstevel@tonic-gate union {
1867c478bd9Sstevel@tonic-gate ush freq; /* frequency count */
1877c478bd9Sstevel@tonic-gate ush code; /* bit string */
1887c478bd9Sstevel@tonic-gate } fc;
1897c478bd9Sstevel@tonic-gate union {
1907c478bd9Sstevel@tonic-gate ush dad; /* father node in Huffman tree */
1917c478bd9Sstevel@tonic-gate ush len; /* length of bit string */
1927c478bd9Sstevel@tonic-gate } dl;
1937c478bd9Sstevel@tonic-gate } FAR ct_data;
1947c478bd9Sstevel@tonic-gate
1957c478bd9Sstevel@tonic-gate #define Freq fc.freq
1967c478bd9Sstevel@tonic-gate #define Code fc.code
1977c478bd9Sstevel@tonic-gate #define Dad dl.dad
1987c478bd9Sstevel@tonic-gate #define Len dl.len
1997c478bd9Sstevel@tonic-gate
2007c478bd9Sstevel@tonic-gate typedef struct static_tree_desc_s static_tree_desc;
2017c478bd9Sstevel@tonic-gate
2027c478bd9Sstevel@tonic-gate typedef struct tree_desc_s {
2037c478bd9Sstevel@tonic-gate ct_data *dyn_tree; /* the dynamic tree */
2047c478bd9Sstevel@tonic-gate int max_code; /* largest code with non zero frequency */
2057c478bd9Sstevel@tonic-gate static_tree_desc *stat_desc; /* the corresponding static tree */
2067c478bd9Sstevel@tonic-gate } FAR tree_desc;
2077c478bd9Sstevel@tonic-gate
2087c478bd9Sstevel@tonic-gate typedef ush Pos;
2097c478bd9Sstevel@tonic-gate typedef Pos FAR Posf;
2107c478bd9Sstevel@tonic-gate typedef unsigned IPos;
2117c478bd9Sstevel@tonic-gate
2127c478bd9Sstevel@tonic-gate /* A Pos is an index in the character window. We use short instead of int to
2137c478bd9Sstevel@tonic-gate * save space in the various tables. IPos is used only for parameter passing.
2147c478bd9Sstevel@tonic-gate */
2157c478bd9Sstevel@tonic-gate
2167c478bd9Sstevel@tonic-gate typedef struct deflate_state {
2177c478bd9Sstevel@tonic-gate z_stream *strm; /* pointer back to this zlib stream */
2187c478bd9Sstevel@tonic-gate int status; /* as the name implies */
2197c478bd9Sstevel@tonic-gate Bytef *pending_buf; /* output still pending */
2207c478bd9Sstevel@tonic-gate Bytef *pending_out; /* next pending byte to output to the stream */
2217c478bd9Sstevel@tonic-gate int pending; /* nb of bytes in the pending buffer */
2227c478bd9Sstevel@tonic-gate uLong adler; /* adler32 of uncompressed data */
2237c478bd9Sstevel@tonic-gate int noheader; /* suppress zlib header and adler32 */
2247c478bd9Sstevel@tonic-gate Byte data_type; /* UNKNOWN, BINARY or ASCII */
2257c478bd9Sstevel@tonic-gate Byte method; /* STORED (for zip only) or DEFLATED */
2267c478bd9Sstevel@tonic-gate int minCompr; /* min size decrease for Z_FLUSH_NOSTORE */
2277c478bd9Sstevel@tonic-gate
2287c478bd9Sstevel@tonic-gate /* used by deflate.c: */
2297c478bd9Sstevel@tonic-gate
2307c478bd9Sstevel@tonic-gate uInt w_size; /* LZ77 window size (32K by default) */
2317c478bd9Sstevel@tonic-gate uInt w_bits; /* log2(w_size) (8..16) */
2327c478bd9Sstevel@tonic-gate uInt w_mask; /* w_size - 1 */
2337c478bd9Sstevel@tonic-gate
2347c478bd9Sstevel@tonic-gate Bytef *window;
2357c478bd9Sstevel@tonic-gate /* Sliding window. Input bytes are read into the second half of the window,
2367c478bd9Sstevel@tonic-gate * and move to the first half later to keep a dictionary of at least wSize
2377c478bd9Sstevel@tonic-gate * bytes. With this organization, matches are limited to a distance of
2387c478bd9Sstevel@tonic-gate * wSize-MAX_MATCH bytes, but this ensures that IO is always
2397c478bd9Sstevel@tonic-gate * performed with a length multiple of the block size. Also, it limits
2407c478bd9Sstevel@tonic-gate * the window size to 64K, which is quite useful on MSDOS.
2417c478bd9Sstevel@tonic-gate * To do: use the user input buffer as sliding window.
2427c478bd9Sstevel@tonic-gate */
2437c478bd9Sstevel@tonic-gate
2447c478bd9Sstevel@tonic-gate ulg window_size;
2457c478bd9Sstevel@tonic-gate /* Actual size of window: 2*wSize, except when the user input buffer
2467c478bd9Sstevel@tonic-gate * is directly used as sliding window.
2477c478bd9Sstevel@tonic-gate */
2487c478bd9Sstevel@tonic-gate
2497c478bd9Sstevel@tonic-gate Posf *prev;
2507c478bd9Sstevel@tonic-gate /* Link to older string with same hash index. To limit the size of this
2517c478bd9Sstevel@tonic-gate * array to 64K, this link is maintained only for the last 32K strings.
2527c478bd9Sstevel@tonic-gate * An index in this array is thus a window index modulo 32K.
2537c478bd9Sstevel@tonic-gate */
2547c478bd9Sstevel@tonic-gate
2557c478bd9Sstevel@tonic-gate Posf *head; /* Heads of the hash chains or NIL. */
2567c478bd9Sstevel@tonic-gate
2577c478bd9Sstevel@tonic-gate uInt ins_h; /* hash index of string to be inserted */
2587c478bd9Sstevel@tonic-gate uInt hash_size; /* number of elements in hash table */
2597c478bd9Sstevel@tonic-gate uInt hash_bits; /* log2(hash_size) */
2607c478bd9Sstevel@tonic-gate uInt hash_mask; /* hash_size-1 */
2617c478bd9Sstevel@tonic-gate
2627c478bd9Sstevel@tonic-gate uInt hash_shift;
2637c478bd9Sstevel@tonic-gate /* Number of bits by which ins_h must be shifted at each input
2647c478bd9Sstevel@tonic-gate * step. It must be such that after MIN_MATCH steps, the oldest
2657c478bd9Sstevel@tonic-gate * byte no longer takes part in the hash key, that is:
2667c478bd9Sstevel@tonic-gate * hash_shift * MIN_MATCH >= hash_bits
2677c478bd9Sstevel@tonic-gate */
2687c478bd9Sstevel@tonic-gate
2697c478bd9Sstevel@tonic-gate long block_start;
2707c478bd9Sstevel@tonic-gate /* Window position at the beginning of the current output block. Gets
2717c478bd9Sstevel@tonic-gate * negative when the window is moved backwards.
2727c478bd9Sstevel@tonic-gate */
2737c478bd9Sstevel@tonic-gate
2747c478bd9Sstevel@tonic-gate uInt match_length; /* length of best match */
2757c478bd9Sstevel@tonic-gate IPos prev_match; /* previous match */
2767c478bd9Sstevel@tonic-gate int match_available; /* set if previous match exists */
2777c478bd9Sstevel@tonic-gate uInt strstart; /* start of string to insert */
2787c478bd9Sstevel@tonic-gate uInt match_start; /* start of matching string */
2797c478bd9Sstevel@tonic-gate uInt lookahead; /* number of valid bytes ahead in window */
2807c478bd9Sstevel@tonic-gate
2817c478bd9Sstevel@tonic-gate uInt prev_length;
2827c478bd9Sstevel@tonic-gate /* Length of the best match at previous step. Matches not greater than this
2837c478bd9Sstevel@tonic-gate * are discarded. This is used in the lazy match evaluation.
2847c478bd9Sstevel@tonic-gate */
2857c478bd9Sstevel@tonic-gate
2867c478bd9Sstevel@tonic-gate uInt max_chain_length;
2877c478bd9Sstevel@tonic-gate /* To speed up deflation, hash chains are never searched beyond this
2887c478bd9Sstevel@tonic-gate * length. A higher limit improves compression ratio but degrades the
2897c478bd9Sstevel@tonic-gate * speed.
2907c478bd9Sstevel@tonic-gate */
2917c478bd9Sstevel@tonic-gate
2927c478bd9Sstevel@tonic-gate uInt max_lazy_match;
2937c478bd9Sstevel@tonic-gate /* Attempt to find a better match only when the current match is strictly
2947c478bd9Sstevel@tonic-gate * smaller than this value. This mechanism is used only for compression
2957c478bd9Sstevel@tonic-gate * levels >= 4.
2967c478bd9Sstevel@tonic-gate */
2977c478bd9Sstevel@tonic-gate # define max_insert_length max_lazy_match
2987c478bd9Sstevel@tonic-gate /* Insert new strings in the hash table only if the match length is not
2997c478bd9Sstevel@tonic-gate * greater than this length. This saves time but degrades compression.
3007c478bd9Sstevel@tonic-gate * max_insert_length is used only for compression levels <= 3.
3017c478bd9Sstevel@tonic-gate */
3027c478bd9Sstevel@tonic-gate
3037c478bd9Sstevel@tonic-gate int level; /* compression level (1..9) */
3047c478bd9Sstevel@tonic-gate int strategy; /* favor or force Huffman coding*/
3057c478bd9Sstevel@tonic-gate
3067c478bd9Sstevel@tonic-gate uInt good_match;
3077c478bd9Sstevel@tonic-gate /* Use a faster search when the previous match is longer than this */
3087c478bd9Sstevel@tonic-gate
3097c478bd9Sstevel@tonic-gate int nice_match; /* Stop searching when current match exceeds this */
3107c478bd9Sstevel@tonic-gate
3117c478bd9Sstevel@tonic-gate /* used by trees.c: */
3127c478bd9Sstevel@tonic-gate /* Didn't use ct_data typedef below to supress compiler warning */
3137c478bd9Sstevel@tonic-gate struct ct_data_s dyn_ltree[HEAP_SIZE]; /* literal and length tree */
3147c478bd9Sstevel@tonic-gate struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
3157c478bd9Sstevel@tonic-gate struct ct_data_s bl_tree[2*BL_CODES+1]; /* Huffman tree for bit lengths */
3167c478bd9Sstevel@tonic-gate
3177c478bd9Sstevel@tonic-gate struct tree_desc_s l_desc; /* desc. for literal tree */
3187c478bd9Sstevel@tonic-gate struct tree_desc_s d_desc; /* desc. for distance tree */
3197c478bd9Sstevel@tonic-gate struct tree_desc_s bl_desc; /* desc. for bit length tree */
3207c478bd9Sstevel@tonic-gate
3217c478bd9Sstevel@tonic-gate ush bl_count[MAX_BITS+1];
3227c478bd9Sstevel@tonic-gate /* number of codes at each bit length for an optimal tree */
3237c478bd9Sstevel@tonic-gate
3247c478bd9Sstevel@tonic-gate int heap[2*L_CODES+1]; /* heap used to build the Huffman trees */
3257c478bd9Sstevel@tonic-gate int heap_len; /* number of elements in the heap */
3267c478bd9Sstevel@tonic-gate int heap_max; /* element of largest frequency */
3277c478bd9Sstevel@tonic-gate /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
3287c478bd9Sstevel@tonic-gate * The same heap array is used to build all trees.
3297c478bd9Sstevel@tonic-gate */
3307c478bd9Sstevel@tonic-gate
3317c478bd9Sstevel@tonic-gate uch depth[2*L_CODES+1];
3327c478bd9Sstevel@tonic-gate /* Depth of each subtree used as tie breaker for trees of equal frequency
3337c478bd9Sstevel@tonic-gate */
3347c478bd9Sstevel@tonic-gate
3357c478bd9Sstevel@tonic-gate uchf *l_buf; /* buffer for literals or lengths */
3367c478bd9Sstevel@tonic-gate
3377c478bd9Sstevel@tonic-gate uInt lit_bufsize;
3387c478bd9Sstevel@tonic-gate /* Size of match buffer for literals/lengths. There are 4 reasons for
3397c478bd9Sstevel@tonic-gate * limiting lit_bufsize to 64K:
3407c478bd9Sstevel@tonic-gate * - frequencies can be kept in 16 bit counters
3417c478bd9Sstevel@tonic-gate * - if compression is not successful for the first block, all input
3427c478bd9Sstevel@tonic-gate * data is still in the window so we can still emit a stored block even
3437c478bd9Sstevel@tonic-gate * when input comes from standard input. (This can also be done for
3447c478bd9Sstevel@tonic-gate * all blocks if lit_bufsize is not greater than 32K.)
3457c478bd9Sstevel@tonic-gate * - if compression is not successful for a file smaller than 64K, we can
3467c478bd9Sstevel@tonic-gate * even emit a stored file instead of a stored block (saving 5 bytes).
3477c478bd9Sstevel@tonic-gate * This is applicable only for zip (not gzip or zlib).
3487c478bd9Sstevel@tonic-gate * - creating new Huffman trees less frequently may not provide fast
3497c478bd9Sstevel@tonic-gate * adaptation to changes in the input data statistics. (Take for
3507c478bd9Sstevel@tonic-gate * example a binary file with poorly compressible code followed by
3517c478bd9Sstevel@tonic-gate * a highly compressible string table.) Smaller buffer sizes give
3527c478bd9Sstevel@tonic-gate * fast adaptation but have of course the overhead of transmitting
3537c478bd9Sstevel@tonic-gate * trees more frequently.
3547c478bd9Sstevel@tonic-gate * - I can't count above 4
3557c478bd9Sstevel@tonic-gate */
3567c478bd9Sstevel@tonic-gate
3577c478bd9Sstevel@tonic-gate uInt last_lit; /* running index in l_buf */
3587c478bd9Sstevel@tonic-gate
3597c478bd9Sstevel@tonic-gate ushf *d_buf;
3607c478bd9Sstevel@tonic-gate /* Buffer for distances. To simplify the code, d_buf and l_buf have
3617c478bd9Sstevel@tonic-gate * the same number of elements. To use different lengths, an extra flag
3627c478bd9Sstevel@tonic-gate * array would be necessary.
3637c478bd9Sstevel@tonic-gate */
3647c478bd9Sstevel@tonic-gate
3657c478bd9Sstevel@tonic-gate ulg opt_len; /* bit length of current block with optimal trees */
3667c478bd9Sstevel@tonic-gate ulg static_len; /* bit length of current block with static trees */
3677c478bd9Sstevel@tonic-gate ulg compressed_len; /* total bit length of compressed file */
3687c478bd9Sstevel@tonic-gate uInt matches; /* number of string matches in current block */
3697c478bd9Sstevel@tonic-gate int last_eob_len; /* bit length of EOB code for last block */
3707c478bd9Sstevel@tonic-gate
3717c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
3727c478bd9Sstevel@tonic-gate ulg bits_sent; /* bit length of the compressed data */
3737c478bd9Sstevel@tonic-gate #endif
3747c478bd9Sstevel@tonic-gate
3757c478bd9Sstevel@tonic-gate ush bi_buf;
3767c478bd9Sstevel@tonic-gate /* Output buffer. bits are inserted starting at the bottom (least
3777c478bd9Sstevel@tonic-gate * significant bits).
3787c478bd9Sstevel@tonic-gate */
3797c478bd9Sstevel@tonic-gate int bi_valid;
3807c478bd9Sstevel@tonic-gate /* Number of valid bits in bi_buf. All bits above the last valid bit
3817c478bd9Sstevel@tonic-gate * are always zero.
3827c478bd9Sstevel@tonic-gate */
3837c478bd9Sstevel@tonic-gate
3847c478bd9Sstevel@tonic-gate uInt blocks_in_packet;
3857c478bd9Sstevel@tonic-gate /* Number of blocks produced since the last time Z_PACKET_FLUSH
3867c478bd9Sstevel@tonic-gate * was used.
3877c478bd9Sstevel@tonic-gate */
3887c478bd9Sstevel@tonic-gate
3897c478bd9Sstevel@tonic-gate } FAR deflate_state;
3907c478bd9Sstevel@tonic-gate
3917c478bd9Sstevel@tonic-gate /* Output a byte on the stream.
3927c478bd9Sstevel@tonic-gate * IN assertion: there is enough room in pending_buf.
3937c478bd9Sstevel@tonic-gate */
3947c478bd9Sstevel@tonic-gate #define put_byte(s, c) {s->pending_buf[s->pending++] = (c);}
3957c478bd9Sstevel@tonic-gate
3967c478bd9Sstevel@tonic-gate
3977c478bd9Sstevel@tonic-gate #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
3987c478bd9Sstevel@tonic-gate /* Minimum amount of lookahead, except at the end of the input file.
3997c478bd9Sstevel@tonic-gate * See deflate.c for comments about the MIN_MATCH+1.
4007c478bd9Sstevel@tonic-gate */
4017c478bd9Sstevel@tonic-gate
4027c478bd9Sstevel@tonic-gate #define MAX_DIST(s) ((s)->w_size-MIN_LOOKAHEAD)
4037c478bd9Sstevel@tonic-gate /* In order to simplify the code, particularly on 16 bit machines, match
4047c478bd9Sstevel@tonic-gate * distances are limited to MAX_DIST instead of WSIZE.
4057c478bd9Sstevel@tonic-gate */
4067c478bd9Sstevel@tonic-gate
4077c478bd9Sstevel@tonic-gate /* in trees.c */
4087c478bd9Sstevel@tonic-gate local void ct_init OF((deflate_state *s));
4097c478bd9Sstevel@tonic-gate local int ct_tally OF((deflate_state *s, int dist, int lc));
4107c478bd9Sstevel@tonic-gate local ulg ct_flush_block OF((deflate_state *s, charf *buf, ulg stored_len,
4117c478bd9Sstevel@tonic-gate int flush));
4127c478bd9Sstevel@tonic-gate local void ct_align OF((deflate_state *s));
4137c478bd9Sstevel@tonic-gate local void ct_stored_block OF((deflate_state *s, charf *buf, ulg stored_len,
4147c478bd9Sstevel@tonic-gate int eof));
4157c478bd9Sstevel@tonic-gate local void ct_stored_type_only OF((deflate_state *s));
4167c478bd9Sstevel@tonic-gate
4177c478bd9Sstevel@tonic-gate
4187c478bd9Sstevel@tonic-gate /*+++++*/
4197c478bd9Sstevel@tonic-gate /* deflate.c -- compress data using the deflation algorithm
4207c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Jean-loup Gailly.
421*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
4227c478bd9Sstevel@tonic-gate */
4237c478bd9Sstevel@tonic-gate
4247c478bd9Sstevel@tonic-gate /*
4257c478bd9Sstevel@tonic-gate * ALGORITHM
4267c478bd9Sstevel@tonic-gate *
4277c478bd9Sstevel@tonic-gate * The "deflation" process depends on being able to identify portions
4287c478bd9Sstevel@tonic-gate * of the input text which are identical to earlier input (within a
4297c478bd9Sstevel@tonic-gate * sliding window trailing behind the input currently being processed).
4307c478bd9Sstevel@tonic-gate *
4317c478bd9Sstevel@tonic-gate * The most straightforward technique turns out to be the fastest for
4327c478bd9Sstevel@tonic-gate * most input files: try all possible matches and select the longest.
4337c478bd9Sstevel@tonic-gate * The key feature of this algorithm is that insertions into the string
4347c478bd9Sstevel@tonic-gate * dictionary are very simple and thus fast, and deletions are avoided
4357c478bd9Sstevel@tonic-gate * completely. Insertions are performed at each input character, whereas
4367c478bd9Sstevel@tonic-gate * string matches are performed only when the previous match ends. So it
4377c478bd9Sstevel@tonic-gate * is preferable to spend more time in matches to allow very fast string
4387c478bd9Sstevel@tonic-gate * insertions and avoid deletions. The matching algorithm for small
4397c478bd9Sstevel@tonic-gate * strings is inspired from that of Rabin & Karp. A brute force approach
4407c478bd9Sstevel@tonic-gate * is used to find longer strings when a small match has been found.
4417c478bd9Sstevel@tonic-gate * A similar algorithm is used in comic (by Jan-Mark Wams) and freeze
4427c478bd9Sstevel@tonic-gate * (by Leonid Broukhis).
4437c478bd9Sstevel@tonic-gate * A previous version of this file used a more sophisticated algorithm
4447c478bd9Sstevel@tonic-gate * (by Fiala and Greene) which is guaranteed to run in linear amortized
4457c478bd9Sstevel@tonic-gate * time, but has a larger average cost, uses more memory and is patented.
4467c478bd9Sstevel@tonic-gate * However the F&G algorithm may be faster for some highly redundant
4477c478bd9Sstevel@tonic-gate * files if the parameter max_chain_length (described below) is too large.
4487c478bd9Sstevel@tonic-gate *
4497c478bd9Sstevel@tonic-gate * ACKNOWLEDGEMENTS
4507c478bd9Sstevel@tonic-gate *
4517c478bd9Sstevel@tonic-gate * The idea of lazy evaluation of matches is due to Jan-Mark Wams, and
4527c478bd9Sstevel@tonic-gate * I found it in 'freeze' written by Leonid Broukhis.
4537c478bd9Sstevel@tonic-gate * Thanks to many people for bug reports and testing.
4547c478bd9Sstevel@tonic-gate *
4557c478bd9Sstevel@tonic-gate * REFERENCES
4567c478bd9Sstevel@tonic-gate *
4577c478bd9Sstevel@tonic-gate * Deutsch, L.P.,"'Deflate' Compressed Data Format Specification".
4587c478bd9Sstevel@tonic-gate * Available in ftp.uu.net:/pub/archiving/zip/doc/deflate-1.1.doc
4597c478bd9Sstevel@tonic-gate *
4607c478bd9Sstevel@tonic-gate * A description of the Rabin and Karp algorithm is given in the book
4617c478bd9Sstevel@tonic-gate * "Algorithms" by R. Sedgewick, Addison-Wesley, p252.
4627c478bd9Sstevel@tonic-gate *
4637c478bd9Sstevel@tonic-gate * Fiala,E.R., and Greene,D.H.
4647c478bd9Sstevel@tonic-gate * Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595
4657c478bd9Sstevel@tonic-gate *
4667c478bd9Sstevel@tonic-gate */
4677c478bd9Sstevel@tonic-gate
4687c478bd9Sstevel@tonic-gate /* From: deflate.c,v 1.8 1995/05/03 17:27:08 jloup Exp */
4697c478bd9Sstevel@tonic-gate
4707c478bd9Sstevel@tonic-gate local char zlib_copyright[] = " deflate Copyright 1995 Jean-loup Gailly ";
4717c478bd9Sstevel@tonic-gate /*
4727c478bd9Sstevel@tonic-gate If you use the zlib library in a product, an acknowledgment is welcome
4737c478bd9Sstevel@tonic-gate in the documentation of your product. If for some reason you cannot
4747c478bd9Sstevel@tonic-gate include such an acknowledgment, I would appreciate that you keep this
4757c478bd9Sstevel@tonic-gate copyright string in the executable of your product.
4767c478bd9Sstevel@tonic-gate */
4777c478bd9Sstevel@tonic-gate
4787c478bd9Sstevel@tonic-gate #define NIL 0
4797c478bd9Sstevel@tonic-gate /* Tail of hash chains */
4807c478bd9Sstevel@tonic-gate
4817c478bd9Sstevel@tonic-gate #ifndef TOO_FAR
4827c478bd9Sstevel@tonic-gate # define TOO_FAR 4096
4837c478bd9Sstevel@tonic-gate #endif
4847c478bd9Sstevel@tonic-gate /* Matches of length 3 are discarded if their distance exceeds TOO_FAR */
4857c478bd9Sstevel@tonic-gate
4867c478bd9Sstevel@tonic-gate #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
4877c478bd9Sstevel@tonic-gate /* Minimum amount of lookahead, except at the end of the input file.
4887c478bd9Sstevel@tonic-gate * See deflate.c for comments about the MIN_MATCH+1.
4897c478bd9Sstevel@tonic-gate */
4907c478bd9Sstevel@tonic-gate
4917c478bd9Sstevel@tonic-gate /* Values for max_lazy_match, good_match and max_chain_length, depending on
4927c478bd9Sstevel@tonic-gate * the desired pack level (0..9). The values given below have been tuned to
4937c478bd9Sstevel@tonic-gate * exclude worst case performance for pathological files. Better values may be
4947c478bd9Sstevel@tonic-gate * found for specific files.
4957c478bd9Sstevel@tonic-gate */
4967c478bd9Sstevel@tonic-gate
4977c478bd9Sstevel@tonic-gate typedef struct config_s {
4987c478bd9Sstevel@tonic-gate ush good_length; /* reduce lazy search above this match length */
4997c478bd9Sstevel@tonic-gate ush max_lazy; /* do not perform lazy search above this match length */
5007c478bd9Sstevel@tonic-gate ush nice_length; /* quit search above this match length */
5017c478bd9Sstevel@tonic-gate ush max_chain;
5027c478bd9Sstevel@tonic-gate } config;
5037c478bd9Sstevel@tonic-gate
5047c478bd9Sstevel@tonic-gate local config configuration_table[10] = {
5057c478bd9Sstevel@tonic-gate /* good lazy nice chain */
5067c478bd9Sstevel@tonic-gate /* 0 */ {0, 0, 0, 0}, /* store only */
5077c478bd9Sstevel@tonic-gate /* 1 */ {4, 4, 8, 4}, /* maximum speed, no lazy matches */
5087c478bd9Sstevel@tonic-gate /* 2 */ {4, 5, 16, 8},
5097c478bd9Sstevel@tonic-gate /* 3 */ {4, 6, 32, 32},
5107c478bd9Sstevel@tonic-gate
5117c478bd9Sstevel@tonic-gate /* 4 */ {4, 4, 16, 16}, /* lazy matches */
5127c478bd9Sstevel@tonic-gate /* 5 */ {8, 16, 32, 32},
5137c478bd9Sstevel@tonic-gate /* 6 */ {8, 16, 128, 128},
5147c478bd9Sstevel@tonic-gate /* 7 */ {8, 32, 128, 256},
5157c478bd9Sstevel@tonic-gate /* 8 */ {32, 128, 258, 1024},
5167c478bd9Sstevel@tonic-gate /* 9 */ {32, 258, 258, 4096}}; /* maximum compression */
5177c478bd9Sstevel@tonic-gate
5187c478bd9Sstevel@tonic-gate /* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4
5197c478bd9Sstevel@tonic-gate * For deflate_fast() (levels <= 3) good is ignored and lazy has a different
5207c478bd9Sstevel@tonic-gate * meaning.
5217c478bd9Sstevel@tonic-gate */
5227c478bd9Sstevel@tonic-gate
5237c478bd9Sstevel@tonic-gate #define EQUAL 0
5247c478bd9Sstevel@tonic-gate /* result of memcmp for equal strings */
5257c478bd9Sstevel@tonic-gate
5267c478bd9Sstevel@tonic-gate /* ===========================================================================
5277c478bd9Sstevel@tonic-gate * Prototypes for local functions.
5287c478bd9Sstevel@tonic-gate */
5297c478bd9Sstevel@tonic-gate
5307c478bd9Sstevel@tonic-gate local void fill_window OF((deflate_state *s));
5317c478bd9Sstevel@tonic-gate local int deflate_fast OF((deflate_state *s, int flush));
5327c478bd9Sstevel@tonic-gate local int deflate_slow OF((deflate_state *s, int flush));
5337c478bd9Sstevel@tonic-gate local void lm_init OF((deflate_state *s));
5347c478bd9Sstevel@tonic-gate local int longest_match OF((deflate_state *s, IPos cur_match));
5357c478bd9Sstevel@tonic-gate local void putShortMSB OF((deflate_state *s, uInt b));
5367c478bd9Sstevel@tonic-gate local void flush_pending OF((z_stream *strm));
5377c478bd9Sstevel@tonic-gate local int read_buf OF((z_stream *strm, charf *buf, unsigned size));
5387c478bd9Sstevel@tonic-gate #ifdef ASMV
5397c478bd9Sstevel@tonic-gate void match_init OF((void)); /* asm code initialization */
5407c478bd9Sstevel@tonic-gate #endif
5417c478bd9Sstevel@tonic-gate
5427c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
5437c478bd9Sstevel@tonic-gate local void check_match OF((deflate_state *s, IPos start, IPos match,
5447c478bd9Sstevel@tonic-gate int length));
5457c478bd9Sstevel@tonic-gate #endif
5467c478bd9Sstevel@tonic-gate
5477c478bd9Sstevel@tonic-gate
5487c478bd9Sstevel@tonic-gate /* ===========================================================================
5497c478bd9Sstevel@tonic-gate * Update a hash value with the given input byte
5507c478bd9Sstevel@tonic-gate * IN assertion: all calls to to UPDATE_HASH are made with consecutive
5517c478bd9Sstevel@tonic-gate * input characters, so that a running hash key can be computed from the
5527c478bd9Sstevel@tonic-gate * previous key instead of complete recalculation each time.
5537c478bd9Sstevel@tonic-gate */
5547c478bd9Sstevel@tonic-gate #define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask)
5557c478bd9Sstevel@tonic-gate
5567c478bd9Sstevel@tonic-gate
5577c478bd9Sstevel@tonic-gate /* ===========================================================================
5587c478bd9Sstevel@tonic-gate * Insert string str in the dictionary and set match_head to the previous head
5597c478bd9Sstevel@tonic-gate * of the hash chain (the most recent string with same hash key). Return
5607c478bd9Sstevel@tonic-gate * the previous length of the hash chain.
5617c478bd9Sstevel@tonic-gate * IN assertion: all calls to to INSERT_STRING are made with consecutive
5627c478bd9Sstevel@tonic-gate * input characters and the first MIN_MATCH bytes of str are valid
5637c478bd9Sstevel@tonic-gate * (except for the last MIN_MATCH-1 bytes of the input file).
5647c478bd9Sstevel@tonic-gate */
5657c478bd9Sstevel@tonic-gate #define INSERT_STRING(s, str, match_head) \
5667c478bd9Sstevel@tonic-gate (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
5677c478bd9Sstevel@tonic-gate s->prev[(str) & s->w_mask] = match_head = s->head[s->ins_h], \
5687c478bd9Sstevel@tonic-gate s->head[s->ins_h] = (str))
5697c478bd9Sstevel@tonic-gate
5707c478bd9Sstevel@tonic-gate /* ===========================================================================
5717c478bd9Sstevel@tonic-gate * Initialize the hash table (avoiding 64K overflow for 16 bit systems).
5727c478bd9Sstevel@tonic-gate * prev[] will be initialized on the fly.
5737c478bd9Sstevel@tonic-gate */
5747c478bd9Sstevel@tonic-gate #define CLEAR_HASH(s) \
5757c478bd9Sstevel@tonic-gate s->head[s->hash_size-1] = NIL; \
5767c478bd9Sstevel@tonic-gate zmemzero((charf *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head));
5777c478bd9Sstevel@tonic-gate
5787c478bd9Sstevel@tonic-gate /* ========================================================================= */
deflateInit(strm,level)5797c478bd9Sstevel@tonic-gate int deflateInit (strm, level)
5807c478bd9Sstevel@tonic-gate z_stream *strm;
5817c478bd9Sstevel@tonic-gate int level;
5827c478bd9Sstevel@tonic-gate {
5837c478bd9Sstevel@tonic-gate return deflateInit2 (strm, level, DEFLATED, MAX_WBITS, DEF_MEM_LEVEL,
5847c478bd9Sstevel@tonic-gate 0, 0);
5857c478bd9Sstevel@tonic-gate /* To do: ignore strm->next_in if we use it as window */
5867c478bd9Sstevel@tonic-gate }
5877c478bd9Sstevel@tonic-gate
5887c478bd9Sstevel@tonic-gate /* ========================================================================= */
deflateInit2(strm,level,method,windowBits,memLevel,strategy,minCompression)5897c478bd9Sstevel@tonic-gate int deflateInit2 (strm, level, method, windowBits, memLevel,
5907c478bd9Sstevel@tonic-gate strategy, minCompression)
5917c478bd9Sstevel@tonic-gate z_stream *strm;
5927c478bd9Sstevel@tonic-gate int level;
5937c478bd9Sstevel@tonic-gate int method;
5947c478bd9Sstevel@tonic-gate int windowBits;
5957c478bd9Sstevel@tonic-gate int memLevel;
5967c478bd9Sstevel@tonic-gate int strategy;
5977c478bd9Sstevel@tonic-gate int minCompression;
5987c478bd9Sstevel@tonic-gate {
5997c478bd9Sstevel@tonic-gate deflate_state *s;
6007c478bd9Sstevel@tonic-gate int noheader = 0;
6017c478bd9Sstevel@tonic-gate
6027c478bd9Sstevel@tonic-gate if (strm == Z_NULL) return Z_STREAM_ERROR;
6037c478bd9Sstevel@tonic-gate
6047c478bd9Sstevel@tonic-gate strm->msg = Z_NULL;
6057c478bd9Sstevel@tonic-gate /* if (strm->zalloc == Z_NULL) strm->zalloc = zcalloc; */
6067c478bd9Sstevel@tonic-gate /* if (strm->zfree == Z_NULL) strm->zfree = zcfree; */
6077c478bd9Sstevel@tonic-gate
6087c478bd9Sstevel@tonic-gate if (level == Z_DEFAULT_COMPRESSION) level = 6;
6097c478bd9Sstevel@tonic-gate
6107c478bd9Sstevel@tonic-gate if (windowBits < 0) { /* undocumented feature: suppress zlib header */
6117c478bd9Sstevel@tonic-gate noheader = 1;
6127c478bd9Sstevel@tonic-gate windowBits = -windowBits;
6137c478bd9Sstevel@tonic-gate }
6147c478bd9Sstevel@tonic-gate if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != DEFLATED ||
6157c478bd9Sstevel@tonic-gate windowBits < 8 || windowBits > 15 || level < 1 || level > 9) {
6167c478bd9Sstevel@tonic-gate return Z_STREAM_ERROR;
6177c478bd9Sstevel@tonic-gate }
6187c478bd9Sstevel@tonic-gate s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state));
6197c478bd9Sstevel@tonic-gate if (s == Z_NULL) return Z_MEM_ERROR;
6207c478bd9Sstevel@tonic-gate strm->state = (struct internal_state FAR *)s;
6217c478bd9Sstevel@tonic-gate s->strm = strm;
6227c478bd9Sstevel@tonic-gate
6237c478bd9Sstevel@tonic-gate s->noheader = noheader;
6247c478bd9Sstevel@tonic-gate s->w_bits = windowBits;
6257c478bd9Sstevel@tonic-gate s->w_size = 1 << s->w_bits;
6267c478bd9Sstevel@tonic-gate s->w_mask = s->w_size - 1;
6277c478bd9Sstevel@tonic-gate
6287c478bd9Sstevel@tonic-gate s->hash_bits = memLevel + 7;
6297c478bd9Sstevel@tonic-gate s->hash_size = 1 << s->hash_bits;
6307c478bd9Sstevel@tonic-gate s->hash_mask = s->hash_size - 1;
6317c478bd9Sstevel@tonic-gate s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH);
6327c478bd9Sstevel@tonic-gate
6337c478bd9Sstevel@tonic-gate s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte));
6347c478bd9Sstevel@tonic-gate s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos));
6357c478bd9Sstevel@tonic-gate s->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos));
6367c478bd9Sstevel@tonic-gate
6377c478bd9Sstevel@tonic-gate s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */
6387c478bd9Sstevel@tonic-gate
6397c478bd9Sstevel@tonic-gate s->pending_buf = (uchf *) ZALLOC(strm, s->lit_bufsize, 2*sizeof(ush));
6407c478bd9Sstevel@tonic-gate
6417c478bd9Sstevel@tonic-gate if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL ||
6427c478bd9Sstevel@tonic-gate s->pending_buf == Z_NULL) {
6437c478bd9Sstevel@tonic-gate strm->msg = z_errmsg[1-Z_MEM_ERROR];
6447c478bd9Sstevel@tonic-gate deflateEnd (strm);
6457c478bd9Sstevel@tonic-gate return Z_MEM_ERROR;
6467c478bd9Sstevel@tonic-gate }
6477c478bd9Sstevel@tonic-gate s->d_buf = (ushf *) &(s->pending_buf[s->lit_bufsize]);
6487c478bd9Sstevel@tonic-gate s->l_buf = (uchf *) &(s->pending_buf[3*s->lit_bufsize]);
6497c478bd9Sstevel@tonic-gate /* We overlay pending_buf and d_buf+l_buf. This works since the average
6507c478bd9Sstevel@tonic-gate * output size for (length,distance) codes is <= 32 bits (worst case
6517c478bd9Sstevel@tonic-gate * is 15+15+13=33).
6527c478bd9Sstevel@tonic-gate */
6537c478bd9Sstevel@tonic-gate
6547c478bd9Sstevel@tonic-gate s->level = level;
6557c478bd9Sstevel@tonic-gate s->strategy = strategy;
6567c478bd9Sstevel@tonic-gate s->method = (Byte)method;
6577c478bd9Sstevel@tonic-gate s->minCompr = minCompression;
6587c478bd9Sstevel@tonic-gate s->blocks_in_packet = 0;
6597c478bd9Sstevel@tonic-gate
6607c478bd9Sstevel@tonic-gate return deflateReset(strm);
6617c478bd9Sstevel@tonic-gate }
6627c478bd9Sstevel@tonic-gate
6637c478bd9Sstevel@tonic-gate /* ========================================================================= */
deflateReset(strm)6647c478bd9Sstevel@tonic-gate int deflateReset (strm)
6657c478bd9Sstevel@tonic-gate z_stream *strm;
6667c478bd9Sstevel@tonic-gate {
6677c478bd9Sstevel@tonic-gate deflate_state *s;
668*55fea89dSDan Cross
6697c478bd9Sstevel@tonic-gate if (strm == Z_NULL || strm->state == Z_NULL ||
6707c478bd9Sstevel@tonic-gate strm->zalloc == Z_NULL || strm->zfree == Z_NULL) return Z_STREAM_ERROR;
6717c478bd9Sstevel@tonic-gate
6727c478bd9Sstevel@tonic-gate strm->total_in = strm->total_out = 0;
6737c478bd9Sstevel@tonic-gate strm->msg = Z_NULL; /* use zfree if we ever allocate msg dynamically */
6747c478bd9Sstevel@tonic-gate strm->data_type = Z_UNKNOWN;
6757c478bd9Sstevel@tonic-gate
6767c478bd9Sstevel@tonic-gate s = (deflate_state *)strm->state;
6777c478bd9Sstevel@tonic-gate s->pending = 0;
6787c478bd9Sstevel@tonic-gate s->pending_out = s->pending_buf;
6797c478bd9Sstevel@tonic-gate
6807c478bd9Sstevel@tonic-gate if (s->noheader < 0) {
6817c478bd9Sstevel@tonic-gate s->noheader = 0; /* was set to -1 by deflate(..., Z_FINISH); */
6827c478bd9Sstevel@tonic-gate }
6837c478bd9Sstevel@tonic-gate s->status = s->noheader ? BUSY_STATE : INIT_STATE;
6847c478bd9Sstevel@tonic-gate s->adler = 1;
6857c478bd9Sstevel@tonic-gate
6867c478bd9Sstevel@tonic-gate ct_init(s);
6877c478bd9Sstevel@tonic-gate lm_init(s);
6887c478bd9Sstevel@tonic-gate
6897c478bd9Sstevel@tonic-gate return Z_OK;
6907c478bd9Sstevel@tonic-gate }
6917c478bd9Sstevel@tonic-gate
6927c478bd9Sstevel@tonic-gate /* =========================================================================
6937c478bd9Sstevel@tonic-gate * Put a short in the pending buffer. The 16-bit value is put in MSB order.
6947c478bd9Sstevel@tonic-gate * IN assertion: the stream state is correct and there is enough room in
6957c478bd9Sstevel@tonic-gate * pending_buf.
6967c478bd9Sstevel@tonic-gate */
putShortMSB(s,b)6977c478bd9Sstevel@tonic-gate local void putShortMSB (s, b)
6987c478bd9Sstevel@tonic-gate deflate_state *s;
6997c478bd9Sstevel@tonic-gate uInt b;
7007c478bd9Sstevel@tonic-gate {
7017c478bd9Sstevel@tonic-gate put_byte(s, (Byte)(b >> 8));
7027c478bd9Sstevel@tonic-gate put_byte(s, (Byte)(b & 0xff));
703*55fea89dSDan Cross }
7047c478bd9Sstevel@tonic-gate
7057c478bd9Sstevel@tonic-gate /* =========================================================================
7067c478bd9Sstevel@tonic-gate * Flush as much pending output as possible.
7077c478bd9Sstevel@tonic-gate */
flush_pending(strm)7087c478bd9Sstevel@tonic-gate local void flush_pending(strm)
7097c478bd9Sstevel@tonic-gate z_stream *strm;
7107c478bd9Sstevel@tonic-gate {
7117c478bd9Sstevel@tonic-gate deflate_state *state = (deflate_state *) strm->state;
7127c478bd9Sstevel@tonic-gate unsigned len = state->pending;
7137c478bd9Sstevel@tonic-gate
7147c478bd9Sstevel@tonic-gate if (len > strm->avail_out) len = strm->avail_out;
7157c478bd9Sstevel@tonic-gate if (len == 0) return;
7167c478bd9Sstevel@tonic-gate
7177c478bd9Sstevel@tonic-gate if (strm->next_out != NULL) {
7187c478bd9Sstevel@tonic-gate zmemcpy(strm->next_out, state->pending_out, len);
7197c478bd9Sstevel@tonic-gate strm->next_out += len;
7207c478bd9Sstevel@tonic-gate }
7217c478bd9Sstevel@tonic-gate state->pending_out += len;
7227c478bd9Sstevel@tonic-gate strm->total_out += len;
7237c478bd9Sstevel@tonic-gate strm->avail_out -= len;
7247c478bd9Sstevel@tonic-gate state->pending -= len;
7257c478bd9Sstevel@tonic-gate if (state->pending == 0) {
7267c478bd9Sstevel@tonic-gate state->pending_out = state->pending_buf;
7277c478bd9Sstevel@tonic-gate }
7287c478bd9Sstevel@tonic-gate }
7297c478bd9Sstevel@tonic-gate
7307c478bd9Sstevel@tonic-gate /* ========================================================================= */
deflate(strm,flush)7317c478bd9Sstevel@tonic-gate int deflate (strm, flush)
7327c478bd9Sstevel@tonic-gate z_stream *strm;
7337c478bd9Sstevel@tonic-gate int flush;
7347c478bd9Sstevel@tonic-gate {
7357c478bd9Sstevel@tonic-gate deflate_state *state = (deflate_state *) strm->state;
7367c478bd9Sstevel@tonic-gate
7377c478bd9Sstevel@tonic-gate if (strm == Z_NULL || state == Z_NULL) return Z_STREAM_ERROR;
738*55fea89dSDan Cross
7397c478bd9Sstevel@tonic-gate if (strm->next_in == Z_NULL && strm->avail_in != 0) {
7407c478bd9Sstevel@tonic-gate ERR_RETURN(strm, Z_STREAM_ERROR);
7417c478bd9Sstevel@tonic-gate }
7427c478bd9Sstevel@tonic-gate if (strm->avail_out == 0) ERR_RETURN(strm, Z_BUF_ERROR);
7437c478bd9Sstevel@tonic-gate
7447c478bd9Sstevel@tonic-gate state->strm = strm; /* just in case */
7457c478bd9Sstevel@tonic-gate
7467c478bd9Sstevel@tonic-gate /* Write the zlib header */
7477c478bd9Sstevel@tonic-gate if (state->status == INIT_STATE) {
7487c478bd9Sstevel@tonic-gate
7497c478bd9Sstevel@tonic-gate uInt header = (DEFLATED + ((state->w_bits-8)<<4)) << 8;
7507c478bd9Sstevel@tonic-gate uInt level_flags = (state->level-1) >> 1;
7517c478bd9Sstevel@tonic-gate
7527c478bd9Sstevel@tonic-gate if (level_flags > 3) level_flags = 3;
7537c478bd9Sstevel@tonic-gate header |= (level_flags << 6);
7547c478bd9Sstevel@tonic-gate header += 31 - (header % 31);
7557c478bd9Sstevel@tonic-gate
7567c478bd9Sstevel@tonic-gate state->status = BUSY_STATE;
7577c478bd9Sstevel@tonic-gate putShortMSB(state, header);
7587c478bd9Sstevel@tonic-gate }
7597c478bd9Sstevel@tonic-gate
7607c478bd9Sstevel@tonic-gate /* Flush as much pending output as possible */
7617c478bd9Sstevel@tonic-gate if (state->pending != 0) {
7627c478bd9Sstevel@tonic-gate flush_pending(strm);
7637c478bd9Sstevel@tonic-gate if (strm->avail_out == 0) return Z_OK;
7647c478bd9Sstevel@tonic-gate }
7657c478bd9Sstevel@tonic-gate
7667c478bd9Sstevel@tonic-gate /* If we came back in here to get the last output from
7677c478bd9Sstevel@tonic-gate * a previous flush, we're done for now.
7687c478bd9Sstevel@tonic-gate */
7697c478bd9Sstevel@tonic-gate if (state->status == FLUSH_STATE) {
7707c478bd9Sstevel@tonic-gate state->status = BUSY_STATE;
7717c478bd9Sstevel@tonic-gate if (flush != Z_NO_FLUSH && flush != Z_FINISH)
7727c478bd9Sstevel@tonic-gate return Z_OK;
7737c478bd9Sstevel@tonic-gate }
7747c478bd9Sstevel@tonic-gate
7757c478bd9Sstevel@tonic-gate /* User must not provide more input after the first FINISH: */
7767c478bd9Sstevel@tonic-gate if (state->status == FINISH_STATE && strm->avail_in != 0) {
7777c478bd9Sstevel@tonic-gate ERR_RETURN(strm, Z_BUF_ERROR);
7787c478bd9Sstevel@tonic-gate }
7797c478bd9Sstevel@tonic-gate
7807c478bd9Sstevel@tonic-gate /* Start a new block or continue the current one.
7817c478bd9Sstevel@tonic-gate */
7827c478bd9Sstevel@tonic-gate if (strm->avail_in != 0 || state->lookahead != 0 ||
7837c478bd9Sstevel@tonic-gate (flush == Z_FINISH && state->status != FINISH_STATE)) {
7847c478bd9Sstevel@tonic-gate int quit;
7857c478bd9Sstevel@tonic-gate
7867c478bd9Sstevel@tonic-gate if (flush == Z_FINISH) {
7877c478bd9Sstevel@tonic-gate state->status = FINISH_STATE;
7887c478bd9Sstevel@tonic-gate }
7897c478bd9Sstevel@tonic-gate if (state->level <= 3) {
7907c478bd9Sstevel@tonic-gate quit = deflate_fast(state, flush);
7917c478bd9Sstevel@tonic-gate } else {
7927c478bd9Sstevel@tonic-gate quit = deflate_slow(state, flush);
7937c478bd9Sstevel@tonic-gate }
7947c478bd9Sstevel@tonic-gate if (quit || strm->avail_out == 0)
7957c478bd9Sstevel@tonic-gate return Z_OK;
7967c478bd9Sstevel@tonic-gate /* If flush != Z_NO_FLUSH && avail_out == 0, the next call
7977c478bd9Sstevel@tonic-gate * of deflate should use the same flush parameter to make sure
7987c478bd9Sstevel@tonic-gate * that the flush is complete. So we don't have to output an
7997c478bd9Sstevel@tonic-gate * empty block here, this will be done at next call. This also
8007c478bd9Sstevel@tonic-gate * ensures that for a very small output buffer, we emit at most
8017c478bd9Sstevel@tonic-gate * one empty block.
8027c478bd9Sstevel@tonic-gate */
8037c478bd9Sstevel@tonic-gate }
8047c478bd9Sstevel@tonic-gate
8057c478bd9Sstevel@tonic-gate /* If a flush was requested, we have a little more to output now. */
8067c478bd9Sstevel@tonic-gate if (flush != Z_NO_FLUSH && flush != Z_FINISH
8077c478bd9Sstevel@tonic-gate && state->status != FINISH_STATE) {
8087c478bd9Sstevel@tonic-gate switch (flush) {
8097c478bd9Sstevel@tonic-gate case Z_PARTIAL_FLUSH:
8107c478bd9Sstevel@tonic-gate ct_align(state);
8117c478bd9Sstevel@tonic-gate break;
8127c478bd9Sstevel@tonic-gate case Z_PACKET_FLUSH:
8137c478bd9Sstevel@tonic-gate /* Output just the 3-bit `stored' block type value,
8147c478bd9Sstevel@tonic-gate but not a zero length. */
8157c478bd9Sstevel@tonic-gate ct_stored_type_only(state);
8167c478bd9Sstevel@tonic-gate break;
8177c478bd9Sstevel@tonic-gate default:
8187c478bd9Sstevel@tonic-gate ct_stored_block(state, (char*)0, 0L, 0);
8197c478bd9Sstevel@tonic-gate /* For a full flush, this empty block will be recognized
8207c478bd9Sstevel@tonic-gate * as a special marker by inflate_sync().
8217c478bd9Sstevel@tonic-gate */
8227c478bd9Sstevel@tonic-gate if (flush == Z_FULL_FLUSH) {
8237c478bd9Sstevel@tonic-gate CLEAR_HASH(state); /* forget history */
8247c478bd9Sstevel@tonic-gate }
8257c478bd9Sstevel@tonic-gate }
8267c478bd9Sstevel@tonic-gate flush_pending(strm);
8277c478bd9Sstevel@tonic-gate if (strm->avail_out == 0) {
8287c478bd9Sstevel@tonic-gate /* We'll have to come back to get the rest of the output;
8297c478bd9Sstevel@tonic-gate * this ensures we don't output a second zero-length stored
8307c478bd9Sstevel@tonic-gate * block (or whatever).
8317c478bd9Sstevel@tonic-gate */
8327c478bd9Sstevel@tonic-gate state->status = FLUSH_STATE;
8337c478bd9Sstevel@tonic-gate return Z_OK;
8347c478bd9Sstevel@tonic-gate }
8357c478bd9Sstevel@tonic-gate }
8367c478bd9Sstevel@tonic-gate
8377c478bd9Sstevel@tonic-gate Assert(strm->avail_out > 0, "bug2");
8387c478bd9Sstevel@tonic-gate
8397c478bd9Sstevel@tonic-gate if (flush != Z_FINISH) return Z_OK;
8407c478bd9Sstevel@tonic-gate if (state->noheader) return Z_STREAM_END;
8417c478bd9Sstevel@tonic-gate
8427c478bd9Sstevel@tonic-gate /* Write the zlib trailer (adler32) */
8437c478bd9Sstevel@tonic-gate putShortMSB(state, (uInt)(state->adler >> 16));
8447c478bd9Sstevel@tonic-gate putShortMSB(state, (uInt)(state->adler & 0xffff));
8457c478bd9Sstevel@tonic-gate flush_pending(strm);
8467c478bd9Sstevel@tonic-gate /* If avail_out is zero, the application will call deflate again
8477c478bd9Sstevel@tonic-gate * to flush the rest.
8487c478bd9Sstevel@tonic-gate */
8497c478bd9Sstevel@tonic-gate state->noheader = -1; /* write the trailer only once! */
8507c478bd9Sstevel@tonic-gate return state->pending != 0 ? Z_OK : Z_STREAM_END;
8517c478bd9Sstevel@tonic-gate }
8527c478bd9Sstevel@tonic-gate
8537c478bd9Sstevel@tonic-gate /* ========================================================================= */
deflateEnd(strm)8547c478bd9Sstevel@tonic-gate int deflateEnd (strm)
8557c478bd9Sstevel@tonic-gate z_stream *strm;
8567c478bd9Sstevel@tonic-gate {
8577c478bd9Sstevel@tonic-gate deflate_state *state = (deflate_state *) strm->state;
8587c478bd9Sstevel@tonic-gate
8597c478bd9Sstevel@tonic-gate if (strm == Z_NULL || state == Z_NULL) return Z_STREAM_ERROR;
8607c478bd9Sstevel@tonic-gate
8617c478bd9Sstevel@tonic-gate TRY_FREE(strm, state->window, state->w_size * 2 * sizeof(Byte));
8627c478bd9Sstevel@tonic-gate TRY_FREE(strm, state->prev, state->w_size * sizeof(Pos));
8637c478bd9Sstevel@tonic-gate TRY_FREE(strm, state->head, state->hash_size * sizeof(Pos));
8647c478bd9Sstevel@tonic-gate TRY_FREE(strm, state->pending_buf, state->lit_bufsize * 2 * sizeof(ush));
8657c478bd9Sstevel@tonic-gate
8667c478bd9Sstevel@tonic-gate ZFREE(strm, state, sizeof(deflate_state));
8677c478bd9Sstevel@tonic-gate strm->state = Z_NULL;
8687c478bd9Sstevel@tonic-gate
8697c478bd9Sstevel@tonic-gate return Z_OK;
8707c478bd9Sstevel@tonic-gate }
8717c478bd9Sstevel@tonic-gate
8727c478bd9Sstevel@tonic-gate /* ===========================================================================
8737c478bd9Sstevel@tonic-gate * Read a new buffer from the current input stream, update the adler32
8747c478bd9Sstevel@tonic-gate * and total number of bytes read.
8757c478bd9Sstevel@tonic-gate */
read_buf(strm,buf,size)8767c478bd9Sstevel@tonic-gate local int read_buf(strm, buf, size)
8777c478bd9Sstevel@tonic-gate z_stream *strm;
8787c478bd9Sstevel@tonic-gate charf *buf;
8797c478bd9Sstevel@tonic-gate unsigned size;
8807c478bd9Sstevel@tonic-gate {
8817c478bd9Sstevel@tonic-gate unsigned len = strm->avail_in;
8827c478bd9Sstevel@tonic-gate deflate_state *state = (deflate_state *) strm->state;
8837c478bd9Sstevel@tonic-gate
8847c478bd9Sstevel@tonic-gate if (len > size) len = size;
8857c478bd9Sstevel@tonic-gate if (len == 0) return 0;
8867c478bd9Sstevel@tonic-gate
8877c478bd9Sstevel@tonic-gate strm->avail_in -= len;
8887c478bd9Sstevel@tonic-gate
8897c478bd9Sstevel@tonic-gate if (!state->noheader) {
8907c478bd9Sstevel@tonic-gate state->adler = adler32(state->adler, strm->next_in, len);
8917c478bd9Sstevel@tonic-gate }
8927c478bd9Sstevel@tonic-gate zmemcpy(buf, strm->next_in, len);
8937c478bd9Sstevel@tonic-gate strm->next_in += len;
8947c478bd9Sstevel@tonic-gate strm->total_in += len;
8957c478bd9Sstevel@tonic-gate
8967c478bd9Sstevel@tonic-gate return (int)len;
8977c478bd9Sstevel@tonic-gate }
8987c478bd9Sstevel@tonic-gate
8997c478bd9Sstevel@tonic-gate /* ===========================================================================
9007c478bd9Sstevel@tonic-gate * Initialize the "longest match" routines for a new zlib stream
9017c478bd9Sstevel@tonic-gate */
lm_init(s)9027c478bd9Sstevel@tonic-gate local void lm_init (s)
9037c478bd9Sstevel@tonic-gate deflate_state *s;
9047c478bd9Sstevel@tonic-gate {
9057c478bd9Sstevel@tonic-gate s->window_size = (ulg)2L*s->w_size;
9067c478bd9Sstevel@tonic-gate
9077c478bd9Sstevel@tonic-gate CLEAR_HASH(s);
9087c478bd9Sstevel@tonic-gate
9097c478bd9Sstevel@tonic-gate /* Set the default configuration parameters:
9107c478bd9Sstevel@tonic-gate */
9117c478bd9Sstevel@tonic-gate s->max_lazy_match = configuration_table[s->level].max_lazy;
9127c478bd9Sstevel@tonic-gate s->good_match = configuration_table[s->level].good_length;
9137c478bd9Sstevel@tonic-gate s->nice_match = configuration_table[s->level].nice_length;
9147c478bd9Sstevel@tonic-gate s->max_chain_length = configuration_table[s->level].max_chain;
9157c478bd9Sstevel@tonic-gate
9167c478bd9Sstevel@tonic-gate s->strstart = 0;
9177c478bd9Sstevel@tonic-gate s->block_start = 0L;
9187c478bd9Sstevel@tonic-gate s->lookahead = 0;
9197c478bd9Sstevel@tonic-gate s->match_length = MIN_MATCH-1;
9207c478bd9Sstevel@tonic-gate s->match_available = 0;
9217c478bd9Sstevel@tonic-gate s->ins_h = 0;
9227c478bd9Sstevel@tonic-gate #ifdef ASMV
9237c478bd9Sstevel@tonic-gate match_init(); /* initialize the asm code */
9247c478bd9Sstevel@tonic-gate #endif
9257c478bd9Sstevel@tonic-gate }
9267c478bd9Sstevel@tonic-gate
9277c478bd9Sstevel@tonic-gate /* ===========================================================================
9287c478bd9Sstevel@tonic-gate * Set match_start to the longest match starting at the given string and
9297c478bd9Sstevel@tonic-gate * return its length. Matches shorter or equal to prev_length are discarded,
9307c478bd9Sstevel@tonic-gate * in which case the result is equal to prev_length and match_start is
9317c478bd9Sstevel@tonic-gate * garbage.
9327c478bd9Sstevel@tonic-gate * IN assertions: cur_match is the head of the hash chain for the current
9337c478bd9Sstevel@tonic-gate * string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
9347c478bd9Sstevel@tonic-gate */
9357c478bd9Sstevel@tonic-gate #ifndef ASMV
9367c478bd9Sstevel@tonic-gate /* For 80x86 and 680x0, an optimized version will be provided in match.asm or
9377c478bd9Sstevel@tonic-gate * match.S. The code will be functionally equivalent.
9387c478bd9Sstevel@tonic-gate */
longest_match(s,cur_match)9397c478bd9Sstevel@tonic-gate local int longest_match(s, cur_match)
9407c478bd9Sstevel@tonic-gate deflate_state *s;
9417c478bd9Sstevel@tonic-gate IPos cur_match; /* current match */
9427c478bd9Sstevel@tonic-gate {
9437c478bd9Sstevel@tonic-gate unsigned chain_length = s->max_chain_length;/* max hash chain length */
9447c478bd9Sstevel@tonic-gate register Bytef *scan = s->window + s->strstart; /* current string */
9457c478bd9Sstevel@tonic-gate register Bytef *match; /* matched string */
9467c478bd9Sstevel@tonic-gate register int len; /* length of current match */
9477c478bd9Sstevel@tonic-gate int best_len = s->prev_length; /* best match length so far */
9487c478bd9Sstevel@tonic-gate IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
9497c478bd9Sstevel@tonic-gate s->strstart - (IPos)MAX_DIST(s) : NIL;
9507c478bd9Sstevel@tonic-gate /* Stop when cur_match becomes <= limit. To simplify the code,
9517c478bd9Sstevel@tonic-gate * we prevent matches with the string of window index 0.
9527c478bd9Sstevel@tonic-gate */
9537c478bd9Sstevel@tonic-gate Posf *prev = s->prev;
9547c478bd9Sstevel@tonic-gate uInt wmask = s->w_mask;
9557c478bd9Sstevel@tonic-gate
9567c478bd9Sstevel@tonic-gate #ifdef UNALIGNED_OK
9577c478bd9Sstevel@tonic-gate /* Compare two bytes at a time. Note: this is not always beneficial.
9587c478bd9Sstevel@tonic-gate * Try with and without -DUNALIGNED_OK to check.
9597c478bd9Sstevel@tonic-gate */
9607c478bd9Sstevel@tonic-gate register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1;
9617c478bd9Sstevel@tonic-gate register ush scan_start = *(ushf*)scan;
9627c478bd9Sstevel@tonic-gate register ush scan_end = *(ushf*)(scan+best_len-1);
9637c478bd9Sstevel@tonic-gate #else
9647c478bd9Sstevel@tonic-gate register Bytef *strend = s->window + s->strstart + MAX_MATCH;
9657c478bd9Sstevel@tonic-gate register Byte scan_end1 = scan[best_len-1];
9667c478bd9Sstevel@tonic-gate register Byte scan_end = scan[best_len];
9677c478bd9Sstevel@tonic-gate #endif
9687c478bd9Sstevel@tonic-gate
9697c478bd9Sstevel@tonic-gate /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
9707c478bd9Sstevel@tonic-gate * It is easy to get rid of this optimization if necessary.
9717c478bd9Sstevel@tonic-gate */
9727c478bd9Sstevel@tonic-gate Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
9737c478bd9Sstevel@tonic-gate
9747c478bd9Sstevel@tonic-gate /* Do not waste too much time if we already have a good match: */
9757c478bd9Sstevel@tonic-gate if (s->prev_length >= s->good_match) {
9767c478bd9Sstevel@tonic-gate chain_length >>= 2;
9777c478bd9Sstevel@tonic-gate }
9787c478bd9Sstevel@tonic-gate Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
9797c478bd9Sstevel@tonic-gate
9807c478bd9Sstevel@tonic-gate do {
9817c478bd9Sstevel@tonic-gate Assert(cur_match < s->strstart, "no future");
9827c478bd9Sstevel@tonic-gate match = s->window + cur_match;
9837c478bd9Sstevel@tonic-gate
9847c478bd9Sstevel@tonic-gate /* Skip to next match if the match length cannot increase
9857c478bd9Sstevel@tonic-gate * or if the match length is less than 2:
9867c478bd9Sstevel@tonic-gate */
9877c478bd9Sstevel@tonic-gate #if (defined(UNALIGNED_OK) && MAX_MATCH == 258)
9887c478bd9Sstevel@tonic-gate /* This code assumes sizeof(unsigned short) == 2. Do not use
9897c478bd9Sstevel@tonic-gate * UNALIGNED_OK if your compiler uses a different size.
9907c478bd9Sstevel@tonic-gate */
9917c478bd9Sstevel@tonic-gate if (*(ushf*)(match+best_len-1) != scan_end ||
9927c478bd9Sstevel@tonic-gate *(ushf*)match != scan_start) continue;
9937c478bd9Sstevel@tonic-gate
9947c478bd9Sstevel@tonic-gate /* It is not necessary to compare scan[2] and match[2] since they are
9957c478bd9Sstevel@tonic-gate * always equal when the other bytes match, given that the hash keys
9967c478bd9Sstevel@tonic-gate * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at
9977c478bd9Sstevel@tonic-gate * strstart+3, +5, ... up to strstart+257. We check for insufficient
9987c478bd9Sstevel@tonic-gate * lookahead only every 4th comparison; the 128th check will be made
9997c478bd9Sstevel@tonic-gate * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is
10007c478bd9Sstevel@tonic-gate * necessary to put more guard bytes at the end of the window, or
10017c478bd9Sstevel@tonic-gate * to check more often for insufficient lookahead.
10027c478bd9Sstevel@tonic-gate */
10037c478bd9Sstevel@tonic-gate Assert(scan[2] == match[2], "scan[2]?");
10047c478bd9Sstevel@tonic-gate scan++, match++;
10057c478bd9Sstevel@tonic-gate do {
10067c478bd9Sstevel@tonic-gate } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
10077c478bd9Sstevel@tonic-gate *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
10087c478bd9Sstevel@tonic-gate *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
10097c478bd9Sstevel@tonic-gate *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
10107c478bd9Sstevel@tonic-gate scan < strend);
10117c478bd9Sstevel@tonic-gate /* The funny "do {}" generates better code on most compilers */
10127c478bd9Sstevel@tonic-gate
10137c478bd9Sstevel@tonic-gate /* Here, scan <= window+strstart+257 */
10147c478bd9Sstevel@tonic-gate Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
10157c478bd9Sstevel@tonic-gate if (*scan == *match) scan++;
10167c478bd9Sstevel@tonic-gate
10177c478bd9Sstevel@tonic-gate len = (MAX_MATCH - 1) - (int)(strend-scan);
10187c478bd9Sstevel@tonic-gate scan = strend - (MAX_MATCH-1);
10197c478bd9Sstevel@tonic-gate
10207c478bd9Sstevel@tonic-gate #else /* UNALIGNED_OK */
10217c478bd9Sstevel@tonic-gate
10227c478bd9Sstevel@tonic-gate if (match[best_len] != scan_end ||
10237c478bd9Sstevel@tonic-gate match[best_len-1] != scan_end1 ||
10247c478bd9Sstevel@tonic-gate *match != *scan ||
10257c478bd9Sstevel@tonic-gate *++match != scan[1]) continue;
10267c478bd9Sstevel@tonic-gate
10277c478bd9Sstevel@tonic-gate /* The check at best_len-1 can be removed because it will be made
10287c478bd9Sstevel@tonic-gate * again later. (This heuristic is not always a win.)
10297c478bd9Sstevel@tonic-gate * It is not necessary to compare scan[2] and match[2] since they
10307c478bd9Sstevel@tonic-gate * are always equal when the other bytes match, given that
10317c478bd9Sstevel@tonic-gate * the hash keys are equal and that HASH_BITS >= 8.
10327c478bd9Sstevel@tonic-gate */
10337c478bd9Sstevel@tonic-gate scan += 2, match++;
10347c478bd9Sstevel@tonic-gate Assert(*scan == *match, "match[2]?");
10357c478bd9Sstevel@tonic-gate
10367c478bd9Sstevel@tonic-gate /* We check for insufficient lookahead only every 8th comparison;
10377c478bd9Sstevel@tonic-gate * the 256th check will be made at strstart+258.
10387c478bd9Sstevel@tonic-gate */
10397c478bd9Sstevel@tonic-gate do {
10407c478bd9Sstevel@tonic-gate } while (*++scan == *++match && *++scan == *++match &&
10417c478bd9Sstevel@tonic-gate *++scan == *++match && *++scan == *++match &&
10427c478bd9Sstevel@tonic-gate *++scan == *++match && *++scan == *++match &&
10437c478bd9Sstevel@tonic-gate *++scan == *++match && *++scan == *++match &&
10447c478bd9Sstevel@tonic-gate scan < strend);
10457c478bd9Sstevel@tonic-gate
10467c478bd9Sstevel@tonic-gate Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
10477c478bd9Sstevel@tonic-gate
10487c478bd9Sstevel@tonic-gate len = MAX_MATCH - (int)(strend - scan);
10497c478bd9Sstevel@tonic-gate scan = strend - MAX_MATCH;
10507c478bd9Sstevel@tonic-gate
10517c478bd9Sstevel@tonic-gate #endif /* UNALIGNED_OK */
10527c478bd9Sstevel@tonic-gate
10537c478bd9Sstevel@tonic-gate if (len > best_len) {
10547c478bd9Sstevel@tonic-gate s->match_start = cur_match;
10557c478bd9Sstevel@tonic-gate best_len = len;
10567c478bd9Sstevel@tonic-gate if (len >= s->nice_match) break;
10577c478bd9Sstevel@tonic-gate #ifdef UNALIGNED_OK
10587c478bd9Sstevel@tonic-gate scan_end = *(ushf*)(scan+best_len-1);
10597c478bd9Sstevel@tonic-gate #else
10607c478bd9Sstevel@tonic-gate scan_end1 = scan[best_len-1];
10617c478bd9Sstevel@tonic-gate scan_end = scan[best_len];
10627c478bd9Sstevel@tonic-gate #endif
10637c478bd9Sstevel@tonic-gate }
10647c478bd9Sstevel@tonic-gate } while ((cur_match = prev[cur_match & wmask]) > limit
10657c478bd9Sstevel@tonic-gate && --chain_length != 0);
10667c478bd9Sstevel@tonic-gate
10677c478bd9Sstevel@tonic-gate return best_len;
10687c478bd9Sstevel@tonic-gate }
10697c478bd9Sstevel@tonic-gate #endif /* ASMV */
10707c478bd9Sstevel@tonic-gate
10717c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
10727c478bd9Sstevel@tonic-gate /* ===========================================================================
10737c478bd9Sstevel@tonic-gate * Check that the match at match_start is indeed a match.
10747c478bd9Sstevel@tonic-gate */
check_match(s,start,match,length)10757c478bd9Sstevel@tonic-gate local void check_match(s, start, match, length)
10767c478bd9Sstevel@tonic-gate deflate_state *s;
10777c478bd9Sstevel@tonic-gate IPos start, match;
10787c478bd9Sstevel@tonic-gate int length;
10797c478bd9Sstevel@tonic-gate {
10807c478bd9Sstevel@tonic-gate /* check that the match is indeed a match */
10817c478bd9Sstevel@tonic-gate if (memcmp((charf *)s->window + match,
10827c478bd9Sstevel@tonic-gate (charf *)s->window + start, length) != EQUAL) {
10837c478bd9Sstevel@tonic-gate fprintf(stderr,
10847c478bd9Sstevel@tonic-gate " start %u, match %u, length %d\n",
10857c478bd9Sstevel@tonic-gate start, match, length);
10867c478bd9Sstevel@tonic-gate do { fprintf(stderr, "%c%c", s->window[match++],
10877c478bd9Sstevel@tonic-gate s->window[start++]); } while (--length != 0);
10887c478bd9Sstevel@tonic-gate z_error("invalid match");
10897c478bd9Sstevel@tonic-gate }
10907c478bd9Sstevel@tonic-gate if (verbose > 1) {
10917c478bd9Sstevel@tonic-gate fprintf(stderr,"\\[%d,%d]", start-match, length);
10927c478bd9Sstevel@tonic-gate do { putc(s->window[start++], stderr); } while (--length != 0);
10937c478bd9Sstevel@tonic-gate }
10947c478bd9Sstevel@tonic-gate }
10957c478bd9Sstevel@tonic-gate #else
10967c478bd9Sstevel@tonic-gate # define check_match(s, start, match, length)
10977c478bd9Sstevel@tonic-gate #endif
10987c478bd9Sstevel@tonic-gate
10997c478bd9Sstevel@tonic-gate /* ===========================================================================
11007c478bd9Sstevel@tonic-gate * Fill the window when the lookahead becomes insufficient.
11017c478bd9Sstevel@tonic-gate * Updates strstart and lookahead.
11027c478bd9Sstevel@tonic-gate *
11037c478bd9Sstevel@tonic-gate * IN assertion: lookahead < MIN_LOOKAHEAD
11047c478bd9Sstevel@tonic-gate * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
11057c478bd9Sstevel@tonic-gate * At least one byte has been read, or avail_in == 0; reads are
11067c478bd9Sstevel@tonic-gate * performed for at least two bytes (required for the zip translate_eol
11077c478bd9Sstevel@tonic-gate * option -- not supported here).
11087c478bd9Sstevel@tonic-gate */
fill_window(s)11097c478bd9Sstevel@tonic-gate local void fill_window(s)
11107c478bd9Sstevel@tonic-gate deflate_state *s;
11117c478bd9Sstevel@tonic-gate {
11127c478bd9Sstevel@tonic-gate register unsigned n, m;
11137c478bd9Sstevel@tonic-gate register Posf *p;
11147c478bd9Sstevel@tonic-gate unsigned more; /* Amount of free space at the end of the window. */
11157c478bd9Sstevel@tonic-gate uInt wsize = s->w_size;
11167c478bd9Sstevel@tonic-gate
11177c478bd9Sstevel@tonic-gate do {
11187c478bd9Sstevel@tonic-gate more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart);
11197c478bd9Sstevel@tonic-gate
11207c478bd9Sstevel@tonic-gate /* Deal with !@#$% 64K limit: */
11217c478bd9Sstevel@tonic-gate if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
11227c478bd9Sstevel@tonic-gate more = wsize;
11237c478bd9Sstevel@tonic-gate } else if (more == (unsigned)(-1)) {
11247c478bd9Sstevel@tonic-gate /* Very unlikely, but possible on 16 bit machine if strstart == 0
11257c478bd9Sstevel@tonic-gate * and lookahead == 1 (input done one byte at time)
11267c478bd9Sstevel@tonic-gate */
11277c478bd9Sstevel@tonic-gate more--;
11287c478bd9Sstevel@tonic-gate
11297c478bd9Sstevel@tonic-gate /* If the window is almost full and there is insufficient lookahead,
11307c478bd9Sstevel@tonic-gate * move the upper half to the lower one to make room in the upper half.
11317c478bd9Sstevel@tonic-gate */
11327c478bd9Sstevel@tonic-gate } else if (s->strstart >= wsize+MAX_DIST(s)) {
11337c478bd9Sstevel@tonic-gate
11347c478bd9Sstevel@tonic-gate /* By the IN assertion, the window is not empty so we can't confuse
11357c478bd9Sstevel@tonic-gate * more == 0 with more == 64K on a 16 bit machine.
11367c478bd9Sstevel@tonic-gate */
11377c478bd9Sstevel@tonic-gate zmemcpy((charf *)s->window, (charf *)s->window+wsize,
11387c478bd9Sstevel@tonic-gate (unsigned)wsize);
11397c478bd9Sstevel@tonic-gate s->match_start -= wsize;
11407c478bd9Sstevel@tonic-gate s->strstart -= wsize; /* we now have strstart >= MAX_DIST */
11417c478bd9Sstevel@tonic-gate
11427c478bd9Sstevel@tonic-gate s->block_start -= (long) wsize;
11437c478bd9Sstevel@tonic-gate
11447c478bd9Sstevel@tonic-gate /* Slide the hash table (could be avoided with 32 bit values
11457c478bd9Sstevel@tonic-gate at the expense of memory usage):
11467c478bd9Sstevel@tonic-gate */
11477c478bd9Sstevel@tonic-gate n = s->hash_size;
11487c478bd9Sstevel@tonic-gate p = &s->head[n];
11497c478bd9Sstevel@tonic-gate do {
11507c478bd9Sstevel@tonic-gate m = *--p;
11517c478bd9Sstevel@tonic-gate *p = (Pos)(m >= wsize ? m-wsize : NIL);
11527c478bd9Sstevel@tonic-gate } while (--n);
11537c478bd9Sstevel@tonic-gate
11547c478bd9Sstevel@tonic-gate n = wsize;
11557c478bd9Sstevel@tonic-gate p = &s->prev[n];
11567c478bd9Sstevel@tonic-gate do {
11577c478bd9Sstevel@tonic-gate m = *--p;
11587c478bd9Sstevel@tonic-gate *p = (Pos)(m >= wsize ? m-wsize : NIL);
11597c478bd9Sstevel@tonic-gate /* If n is not on any hash chain, prev[n] is garbage but
11607c478bd9Sstevel@tonic-gate * its value will never be used.
11617c478bd9Sstevel@tonic-gate */
11627c478bd9Sstevel@tonic-gate } while (--n);
11637c478bd9Sstevel@tonic-gate
11647c478bd9Sstevel@tonic-gate more += wsize;
11657c478bd9Sstevel@tonic-gate }
11667c478bd9Sstevel@tonic-gate if (s->strm->avail_in == 0) return;
11677c478bd9Sstevel@tonic-gate
11687c478bd9Sstevel@tonic-gate /* If there was no sliding:
11697c478bd9Sstevel@tonic-gate * strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
11707c478bd9Sstevel@tonic-gate * more == window_size - lookahead - strstart
11717c478bd9Sstevel@tonic-gate * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
11727c478bd9Sstevel@tonic-gate * => more >= window_size - 2*WSIZE + 2
11737c478bd9Sstevel@tonic-gate * In the BIG_MEM or MMAP case (not yet supported),
11747c478bd9Sstevel@tonic-gate * window_size == input_size + MIN_LOOKAHEAD &&
11757c478bd9Sstevel@tonic-gate * strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD.
11767c478bd9Sstevel@tonic-gate * Otherwise, window_size == 2*WSIZE so more >= 2.
11777c478bd9Sstevel@tonic-gate * If there was sliding, more >= WSIZE. So in all cases, more >= 2.
11787c478bd9Sstevel@tonic-gate */
11797c478bd9Sstevel@tonic-gate Assert(more >= 2, "more < 2");
11807c478bd9Sstevel@tonic-gate
11817c478bd9Sstevel@tonic-gate n = read_buf(s->strm, (charf *)s->window + s->strstart + s->lookahead,
11827c478bd9Sstevel@tonic-gate more);
11837c478bd9Sstevel@tonic-gate s->lookahead += n;
11847c478bd9Sstevel@tonic-gate
11857c478bd9Sstevel@tonic-gate /* Initialize the hash value now that we have some input: */
11867c478bd9Sstevel@tonic-gate if (s->lookahead >= MIN_MATCH) {
11877c478bd9Sstevel@tonic-gate s->ins_h = s->window[s->strstart];
11887c478bd9Sstevel@tonic-gate UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]);
11897c478bd9Sstevel@tonic-gate #if MIN_MATCH != 3
11907c478bd9Sstevel@tonic-gate Call UPDATE_HASH() MIN_MATCH-3 more times
11917c478bd9Sstevel@tonic-gate #endif
11927c478bd9Sstevel@tonic-gate }
11937c478bd9Sstevel@tonic-gate /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage,
11947c478bd9Sstevel@tonic-gate * but this is not important since only literal bytes will be emitted.
11957c478bd9Sstevel@tonic-gate */
11967c478bd9Sstevel@tonic-gate
11977c478bd9Sstevel@tonic-gate } while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0);
11987c478bd9Sstevel@tonic-gate }
11997c478bd9Sstevel@tonic-gate
12007c478bd9Sstevel@tonic-gate /* ===========================================================================
12017c478bd9Sstevel@tonic-gate * Flush the current block, with given end-of-file flag.
12027c478bd9Sstevel@tonic-gate * IN assertion: strstart is set to the end of the current match.
12037c478bd9Sstevel@tonic-gate */
12047c478bd9Sstevel@tonic-gate #define FLUSH_BLOCK_ONLY(s, flush) { \
12057c478bd9Sstevel@tonic-gate ct_flush_block(s, (s->block_start >= 0L ? \
12067c478bd9Sstevel@tonic-gate (charf *)&s->window[(unsigned)s->block_start] : \
12077c478bd9Sstevel@tonic-gate (charf *)Z_NULL), (long)s->strstart - s->block_start, (flush)); \
12087c478bd9Sstevel@tonic-gate s->block_start = s->strstart; \
12097c478bd9Sstevel@tonic-gate flush_pending(s->strm); \
12107c478bd9Sstevel@tonic-gate Tracev((stderr,"[FLUSH]")); \
12117c478bd9Sstevel@tonic-gate }
12127c478bd9Sstevel@tonic-gate
12137c478bd9Sstevel@tonic-gate /* Same but force premature exit if necessary. */
12147c478bd9Sstevel@tonic-gate #define FLUSH_BLOCK(s, flush) { \
12157c478bd9Sstevel@tonic-gate FLUSH_BLOCK_ONLY(s, flush); \
12167c478bd9Sstevel@tonic-gate if (s->strm->avail_out == 0) return 1; \
12177c478bd9Sstevel@tonic-gate }
12187c478bd9Sstevel@tonic-gate
12197c478bd9Sstevel@tonic-gate /* ===========================================================================
12207c478bd9Sstevel@tonic-gate * Compress as much as possible from the input stream, return true if
12217c478bd9Sstevel@tonic-gate * processing was terminated prematurely (no more input or output space).
12227c478bd9Sstevel@tonic-gate * This function does not perform lazy evaluationof matches and inserts
12237c478bd9Sstevel@tonic-gate * new strings in the dictionary only for unmatched strings or for short
12247c478bd9Sstevel@tonic-gate * matches. It is used only for the fast compression options.
12257c478bd9Sstevel@tonic-gate */
deflate_fast(s,flush)12267c478bd9Sstevel@tonic-gate local int deflate_fast(s, flush)
12277c478bd9Sstevel@tonic-gate deflate_state *s;
12287c478bd9Sstevel@tonic-gate int flush;
12297c478bd9Sstevel@tonic-gate {
12307c478bd9Sstevel@tonic-gate IPos hash_head = NIL; /* head of the hash chain */
12317c478bd9Sstevel@tonic-gate int bflush; /* set if current block must be flushed */
12327c478bd9Sstevel@tonic-gate
12337c478bd9Sstevel@tonic-gate s->prev_length = MIN_MATCH-1;
12347c478bd9Sstevel@tonic-gate
12357c478bd9Sstevel@tonic-gate for (;;) {
12367c478bd9Sstevel@tonic-gate /* Make sure that we always have enough lookahead, except
12377c478bd9Sstevel@tonic-gate * at the end of the input file. We need MAX_MATCH bytes
12387c478bd9Sstevel@tonic-gate * for the next match, plus MIN_MATCH bytes to insert the
12397c478bd9Sstevel@tonic-gate * string following the next match.
12407c478bd9Sstevel@tonic-gate */
12417c478bd9Sstevel@tonic-gate if (s->lookahead < MIN_LOOKAHEAD) {
12427c478bd9Sstevel@tonic-gate fill_window(s);
12437c478bd9Sstevel@tonic-gate if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) return 1;
12447c478bd9Sstevel@tonic-gate
12457c478bd9Sstevel@tonic-gate if (s->lookahead == 0) break; /* flush the current block */
12467c478bd9Sstevel@tonic-gate }
12477c478bd9Sstevel@tonic-gate
12487c478bd9Sstevel@tonic-gate /* Insert the string window[strstart .. strstart+2] in the
12497c478bd9Sstevel@tonic-gate * dictionary, and set hash_head to the head of the hash chain:
12507c478bd9Sstevel@tonic-gate */
12517c478bd9Sstevel@tonic-gate if (s->lookahead >= MIN_MATCH) {
12527c478bd9Sstevel@tonic-gate INSERT_STRING(s, s->strstart, hash_head);
12537c478bd9Sstevel@tonic-gate }
12547c478bd9Sstevel@tonic-gate
12557c478bd9Sstevel@tonic-gate /* Find the longest match, discarding those <= prev_length.
12567c478bd9Sstevel@tonic-gate * At this point we have always match_length < MIN_MATCH
12577c478bd9Sstevel@tonic-gate */
12587c478bd9Sstevel@tonic-gate if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) {
12597c478bd9Sstevel@tonic-gate /* To simplify the code, we prevent matches with the string
12607c478bd9Sstevel@tonic-gate * of window index 0 (in particular we have to avoid a match
12617c478bd9Sstevel@tonic-gate * of the string with itself at the start of the input file).
12627c478bd9Sstevel@tonic-gate */
12637c478bd9Sstevel@tonic-gate if (s->strategy != Z_HUFFMAN_ONLY) {
12647c478bd9Sstevel@tonic-gate s->match_length = longest_match (s, hash_head);
12657c478bd9Sstevel@tonic-gate }
12667c478bd9Sstevel@tonic-gate /* longest_match() sets match_start */
12677c478bd9Sstevel@tonic-gate
12687c478bd9Sstevel@tonic-gate if (s->match_length > s->lookahead) s->match_length = s->lookahead;
12697c478bd9Sstevel@tonic-gate }
12707c478bd9Sstevel@tonic-gate if (s->match_length >= MIN_MATCH) {
12717c478bd9Sstevel@tonic-gate check_match(s, s->strstart, s->match_start, s->match_length);
12727c478bd9Sstevel@tonic-gate
12737c478bd9Sstevel@tonic-gate bflush = ct_tally(s, s->strstart - s->match_start,
12747c478bd9Sstevel@tonic-gate s->match_length - MIN_MATCH);
12757c478bd9Sstevel@tonic-gate
12767c478bd9Sstevel@tonic-gate s->lookahead -= s->match_length;
12777c478bd9Sstevel@tonic-gate
12787c478bd9Sstevel@tonic-gate /* Insert new strings in the hash table only if the match length
12797c478bd9Sstevel@tonic-gate * is not too large. This saves time but degrades compression.
12807c478bd9Sstevel@tonic-gate */
12817c478bd9Sstevel@tonic-gate if (s->match_length <= s->max_insert_length &&
12827c478bd9Sstevel@tonic-gate s->lookahead >= MIN_MATCH) {
12837c478bd9Sstevel@tonic-gate s->match_length--; /* string at strstart already in hash table */
12847c478bd9Sstevel@tonic-gate do {
12857c478bd9Sstevel@tonic-gate s->strstart++;
12867c478bd9Sstevel@tonic-gate INSERT_STRING(s, s->strstart, hash_head);
12877c478bd9Sstevel@tonic-gate /* strstart never exceeds WSIZE-MAX_MATCH, so there are
12887c478bd9Sstevel@tonic-gate * always MIN_MATCH bytes ahead.
12897c478bd9Sstevel@tonic-gate */
12907c478bd9Sstevel@tonic-gate } while (--s->match_length != 0);
1291*55fea89dSDan Cross s->strstart++;
12927c478bd9Sstevel@tonic-gate } else {
12937c478bd9Sstevel@tonic-gate s->strstart += s->match_length;
12947c478bd9Sstevel@tonic-gate s->match_length = 0;
12957c478bd9Sstevel@tonic-gate s->ins_h = s->window[s->strstart];
12967c478bd9Sstevel@tonic-gate UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]);
12977c478bd9Sstevel@tonic-gate #if MIN_MATCH != 3
12987c478bd9Sstevel@tonic-gate Call UPDATE_HASH() MIN_MATCH-3 more times
12997c478bd9Sstevel@tonic-gate #endif
13007c478bd9Sstevel@tonic-gate /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not
13017c478bd9Sstevel@tonic-gate * matter since it will be recomputed at next deflate call.
13027c478bd9Sstevel@tonic-gate */
13037c478bd9Sstevel@tonic-gate }
13047c478bd9Sstevel@tonic-gate } else {
13057c478bd9Sstevel@tonic-gate /* No match, output a literal byte */
13067c478bd9Sstevel@tonic-gate Tracevv((stderr,"%c", s->window[s->strstart]));
13077c478bd9Sstevel@tonic-gate bflush = ct_tally (s, 0, s->window[s->strstart]);
13087c478bd9Sstevel@tonic-gate s->lookahead--;
1309*55fea89dSDan Cross s->strstart++;
13107c478bd9Sstevel@tonic-gate }
13117c478bd9Sstevel@tonic-gate if (bflush) FLUSH_BLOCK(s, Z_NO_FLUSH);
13127c478bd9Sstevel@tonic-gate }
13137c478bd9Sstevel@tonic-gate FLUSH_BLOCK(s, flush);
13147c478bd9Sstevel@tonic-gate return 0; /* normal exit */
13157c478bd9Sstevel@tonic-gate }
13167c478bd9Sstevel@tonic-gate
13177c478bd9Sstevel@tonic-gate /* ===========================================================================
13187c478bd9Sstevel@tonic-gate * Same as above, but achieves better compression. We use a lazy
13197c478bd9Sstevel@tonic-gate * evaluation for matches: a match is finally adopted only if there is
13207c478bd9Sstevel@tonic-gate * no better match at the next window position.
13217c478bd9Sstevel@tonic-gate */
deflate_slow(s,flush)13227c478bd9Sstevel@tonic-gate local int deflate_slow(s, flush)
13237c478bd9Sstevel@tonic-gate deflate_state *s;
13247c478bd9Sstevel@tonic-gate int flush;
13257c478bd9Sstevel@tonic-gate {
13267c478bd9Sstevel@tonic-gate IPos hash_head = NIL; /* head of hash chain */
13277c478bd9Sstevel@tonic-gate int bflush; /* set if current block must be flushed */
13287c478bd9Sstevel@tonic-gate
13297c478bd9Sstevel@tonic-gate /* Process the input block. */
13307c478bd9Sstevel@tonic-gate for (;;) {
13317c478bd9Sstevel@tonic-gate /* Make sure that we always have enough lookahead, except
13327c478bd9Sstevel@tonic-gate * at the end of the input file. We need MAX_MATCH bytes
13337c478bd9Sstevel@tonic-gate * for the next match, plus MIN_MATCH bytes to insert the
13347c478bd9Sstevel@tonic-gate * string following the next match.
13357c478bd9Sstevel@tonic-gate */
13367c478bd9Sstevel@tonic-gate if (s->lookahead < MIN_LOOKAHEAD) {
13377c478bd9Sstevel@tonic-gate fill_window(s);
13387c478bd9Sstevel@tonic-gate if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) return 1;
13397c478bd9Sstevel@tonic-gate
13407c478bd9Sstevel@tonic-gate if (s->lookahead == 0) break; /* flush the current block */
13417c478bd9Sstevel@tonic-gate }
13427c478bd9Sstevel@tonic-gate
13437c478bd9Sstevel@tonic-gate /* Insert the string window[strstart .. strstart+2] in the
13447c478bd9Sstevel@tonic-gate * dictionary, and set hash_head to the head of the hash chain:
13457c478bd9Sstevel@tonic-gate */
13467c478bd9Sstevel@tonic-gate if (s->lookahead >= MIN_MATCH) {
13477c478bd9Sstevel@tonic-gate INSERT_STRING(s, s->strstart, hash_head);
13487c478bd9Sstevel@tonic-gate }
13497c478bd9Sstevel@tonic-gate
13507c478bd9Sstevel@tonic-gate /* Find the longest match, discarding those <= prev_length.
13517c478bd9Sstevel@tonic-gate */
13527c478bd9Sstevel@tonic-gate s->prev_length = s->match_length, s->prev_match = s->match_start;
13537c478bd9Sstevel@tonic-gate s->match_length = MIN_MATCH-1;
13547c478bd9Sstevel@tonic-gate
13557c478bd9Sstevel@tonic-gate if (hash_head != NIL && s->prev_length < s->max_lazy_match &&
13567c478bd9Sstevel@tonic-gate s->strstart - hash_head <= MAX_DIST(s)) {
13577c478bd9Sstevel@tonic-gate /* To simplify the code, we prevent matches with the string
13587c478bd9Sstevel@tonic-gate * of window index 0 (in particular we have to avoid a match
13597c478bd9Sstevel@tonic-gate * of the string with itself at the start of the input file).
13607c478bd9Sstevel@tonic-gate */
13617c478bd9Sstevel@tonic-gate if (s->strategy != Z_HUFFMAN_ONLY) {
13627c478bd9Sstevel@tonic-gate s->match_length = longest_match (s, hash_head);
13637c478bd9Sstevel@tonic-gate }
13647c478bd9Sstevel@tonic-gate /* longest_match() sets match_start */
13657c478bd9Sstevel@tonic-gate if (s->match_length > s->lookahead) s->match_length = s->lookahead;
13667c478bd9Sstevel@tonic-gate
13677c478bd9Sstevel@tonic-gate if (s->match_length <= 5 && (s->strategy == Z_FILTERED ||
13687c478bd9Sstevel@tonic-gate (s->match_length == MIN_MATCH &&
13697c478bd9Sstevel@tonic-gate s->strstart - s->match_start > TOO_FAR))) {
13707c478bd9Sstevel@tonic-gate
13717c478bd9Sstevel@tonic-gate /* If prev_match is also MIN_MATCH, match_start is garbage
13727c478bd9Sstevel@tonic-gate * but we will ignore the current match anyway.
13737c478bd9Sstevel@tonic-gate */
13747c478bd9Sstevel@tonic-gate s->match_length = MIN_MATCH-1;
13757c478bd9Sstevel@tonic-gate }
13767c478bd9Sstevel@tonic-gate }
13777c478bd9Sstevel@tonic-gate /* If there was a match at the previous step and the current
13787c478bd9Sstevel@tonic-gate * match is not better, output the previous match:
13797c478bd9Sstevel@tonic-gate */
13807c478bd9Sstevel@tonic-gate if (s->prev_length >= MIN_MATCH && s->match_length <= s->prev_length) {
13817c478bd9Sstevel@tonic-gate uInt max_insert = s->strstart + s->lookahead - MIN_MATCH;
13827c478bd9Sstevel@tonic-gate /* Do not insert strings in hash table beyond this. */
13837c478bd9Sstevel@tonic-gate
13847c478bd9Sstevel@tonic-gate check_match(s, s->strstart-1, s->prev_match, s->prev_length);
13857c478bd9Sstevel@tonic-gate
13867c478bd9Sstevel@tonic-gate bflush = ct_tally(s, s->strstart -1 - s->prev_match,
13877c478bd9Sstevel@tonic-gate s->prev_length - MIN_MATCH);
13887c478bd9Sstevel@tonic-gate
13897c478bd9Sstevel@tonic-gate /* Insert in hash table all strings up to the end of the match.
13907c478bd9Sstevel@tonic-gate * strstart-1 and strstart are already inserted. If there is not
13917c478bd9Sstevel@tonic-gate * enough lookahead, the last two strings are not inserted in
13927c478bd9Sstevel@tonic-gate * the hash table.
13937c478bd9Sstevel@tonic-gate */
13947c478bd9Sstevel@tonic-gate s->lookahead -= s->prev_length-1;
13957c478bd9Sstevel@tonic-gate s->prev_length -= 2;
13967c478bd9Sstevel@tonic-gate do {
13977c478bd9Sstevel@tonic-gate if (++s->strstart <= max_insert) {
13987c478bd9Sstevel@tonic-gate INSERT_STRING(s, s->strstart, hash_head);
13997c478bd9Sstevel@tonic-gate }
14007c478bd9Sstevel@tonic-gate } while (--s->prev_length != 0);
14017c478bd9Sstevel@tonic-gate s->match_available = 0;
14027c478bd9Sstevel@tonic-gate s->match_length = MIN_MATCH-1;
14037c478bd9Sstevel@tonic-gate s->strstart++;
14047c478bd9Sstevel@tonic-gate
14057c478bd9Sstevel@tonic-gate if (bflush) FLUSH_BLOCK(s, Z_NO_FLUSH);
14067c478bd9Sstevel@tonic-gate
14077c478bd9Sstevel@tonic-gate } else if (s->match_available) {
14087c478bd9Sstevel@tonic-gate /* If there was no match at the previous position, output a
14097c478bd9Sstevel@tonic-gate * single literal. If there was a match but the current match
14107c478bd9Sstevel@tonic-gate * is longer, truncate the previous match to a single literal.
14117c478bd9Sstevel@tonic-gate */
14127c478bd9Sstevel@tonic-gate Tracevv((stderr,"%c", s->window[s->strstart-1]));
14137c478bd9Sstevel@tonic-gate if (ct_tally (s, 0, s->window[s->strstart-1])) {
14147c478bd9Sstevel@tonic-gate FLUSH_BLOCK_ONLY(s, Z_NO_FLUSH);
14157c478bd9Sstevel@tonic-gate }
14167c478bd9Sstevel@tonic-gate s->strstart++;
14177c478bd9Sstevel@tonic-gate s->lookahead--;
14187c478bd9Sstevel@tonic-gate if (s->strm->avail_out == 0) return 1;
14197c478bd9Sstevel@tonic-gate } else {
14207c478bd9Sstevel@tonic-gate /* There is no previous match to compare with, wait for
14217c478bd9Sstevel@tonic-gate * the next step to decide.
14227c478bd9Sstevel@tonic-gate */
14237c478bd9Sstevel@tonic-gate s->match_available = 1;
14247c478bd9Sstevel@tonic-gate s->strstart++;
14257c478bd9Sstevel@tonic-gate s->lookahead--;
14267c478bd9Sstevel@tonic-gate }
14277c478bd9Sstevel@tonic-gate }
14287c478bd9Sstevel@tonic-gate Assert (flush != Z_NO_FLUSH, "no flush?");
14297c478bd9Sstevel@tonic-gate if (s->match_available) {
14307c478bd9Sstevel@tonic-gate Tracevv((stderr,"%c", s->window[s->strstart-1]));
14317c478bd9Sstevel@tonic-gate ct_tally (s, 0, s->window[s->strstart-1]);
14327c478bd9Sstevel@tonic-gate s->match_available = 0;
14337c478bd9Sstevel@tonic-gate }
14347c478bd9Sstevel@tonic-gate FLUSH_BLOCK(s, flush);
14357c478bd9Sstevel@tonic-gate return 0;
14367c478bd9Sstevel@tonic-gate }
14377c478bd9Sstevel@tonic-gate
14387c478bd9Sstevel@tonic-gate
14397c478bd9Sstevel@tonic-gate /*+++++*/
14407c478bd9Sstevel@tonic-gate /* trees.c -- output deflated data using Huffman coding
14417c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Jean-loup Gailly
1442*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
14437c478bd9Sstevel@tonic-gate */
14447c478bd9Sstevel@tonic-gate
14457c478bd9Sstevel@tonic-gate /*
14467c478bd9Sstevel@tonic-gate * ALGORITHM
14477c478bd9Sstevel@tonic-gate *
14487c478bd9Sstevel@tonic-gate * The "deflation" process uses several Huffman trees. The more
14497c478bd9Sstevel@tonic-gate * common source values are represented by shorter bit sequences.
14507c478bd9Sstevel@tonic-gate *
14517c478bd9Sstevel@tonic-gate * Each code tree is stored in a compressed form which is itself
14527c478bd9Sstevel@tonic-gate * a Huffman encoding of the lengths of all the code strings (in
14537c478bd9Sstevel@tonic-gate * ascending order by source values). The actual code strings are
14547c478bd9Sstevel@tonic-gate * reconstructed from the lengths in the inflate process, as described
14557c478bd9Sstevel@tonic-gate * in the deflate specification.
14567c478bd9Sstevel@tonic-gate *
14577c478bd9Sstevel@tonic-gate * REFERENCES
14587c478bd9Sstevel@tonic-gate *
14597c478bd9Sstevel@tonic-gate * Deutsch, L.P.,"'Deflate' Compressed Data Format Specification".
14607c478bd9Sstevel@tonic-gate * Available in ftp.uu.net:/pub/archiving/zip/doc/deflate-1.1.doc
14617c478bd9Sstevel@tonic-gate *
14627c478bd9Sstevel@tonic-gate * Storer, James A.
14637c478bd9Sstevel@tonic-gate * Data Compression: Methods and Theory, pp. 49-50.
14647c478bd9Sstevel@tonic-gate * Computer Science Press, 1988. ISBN 0-7167-8156-5.
14657c478bd9Sstevel@tonic-gate *
14667c478bd9Sstevel@tonic-gate * Sedgewick, R.
14677c478bd9Sstevel@tonic-gate * Algorithms, p290.
14687c478bd9Sstevel@tonic-gate * Addison-Wesley, 1983. ISBN 0-201-06672-6.
14697c478bd9Sstevel@tonic-gate */
14707c478bd9Sstevel@tonic-gate
14717c478bd9Sstevel@tonic-gate /* From: trees.c,v 1.5 1995/05/03 17:27:12 jloup Exp */
14727c478bd9Sstevel@tonic-gate
14737c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
14747c478bd9Sstevel@tonic-gate # include <ctype.h>
14757c478bd9Sstevel@tonic-gate #endif
14767c478bd9Sstevel@tonic-gate
14777c478bd9Sstevel@tonic-gate /* ===========================================================================
14787c478bd9Sstevel@tonic-gate * Constants
14797c478bd9Sstevel@tonic-gate */
14807c478bd9Sstevel@tonic-gate
14817c478bd9Sstevel@tonic-gate #define MAX_BL_BITS 7
14827c478bd9Sstevel@tonic-gate /* Bit length codes must not exceed MAX_BL_BITS bits */
14837c478bd9Sstevel@tonic-gate
14847c478bd9Sstevel@tonic-gate #define END_BLOCK 256
14857c478bd9Sstevel@tonic-gate /* end of block literal code */
14867c478bd9Sstevel@tonic-gate
14877c478bd9Sstevel@tonic-gate #define REP_3_6 16
14887c478bd9Sstevel@tonic-gate /* repeat previous bit length 3-6 times (2 bits of repeat count) */
14897c478bd9Sstevel@tonic-gate
14907c478bd9Sstevel@tonic-gate #define REPZ_3_10 17
14917c478bd9Sstevel@tonic-gate /* repeat a zero length 3-10 times (3 bits of repeat count) */
14927c478bd9Sstevel@tonic-gate
14937c478bd9Sstevel@tonic-gate #define REPZ_11_138 18
14947c478bd9Sstevel@tonic-gate /* repeat a zero length 11-138 times (7 bits of repeat count) */
14957c478bd9Sstevel@tonic-gate
14967c478bd9Sstevel@tonic-gate local int extra_lbits[LENGTH_CODES] /* extra bits for each length code */
14977c478bd9Sstevel@tonic-gate = {0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0};
14987c478bd9Sstevel@tonic-gate
14997c478bd9Sstevel@tonic-gate local int extra_dbits[D_CODES] /* extra bits for each distance code */
15007c478bd9Sstevel@tonic-gate = {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
15017c478bd9Sstevel@tonic-gate
15027c478bd9Sstevel@tonic-gate local int extra_blbits[BL_CODES]/* extra bits for each bit length code */
15037c478bd9Sstevel@tonic-gate = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7};
15047c478bd9Sstevel@tonic-gate
15057c478bd9Sstevel@tonic-gate local uch bl_order[BL_CODES]
15067c478bd9Sstevel@tonic-gate = {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15};
15077c478bd9Sstevel@tonic-gate /* The lengths of the bit length codes are sent in order of decreasing
15087c478bd9Sstevel@tonic-gate * probability, to avoid transmitting the lengths for unused bit length codes.
15097c478bd9Sstevel@tonic-gate */
15107c478bd9Sstevel@tonic-gate
15117c478bd9Sstevel@tonic-gate #define Buf_size (8 * 2*sizeof(char))
15127c478bd9Sstevel@tonic-gate /* Number of bits used within bi_buf. (bi_buf might be implemented on
15137c478bd9Sstevel@tonic-gate * more than 16 bits on some systems.)
15147c478bd9Sstevel@tonic-gate */
15157c478bd9Sstevel@tonic-gate
15167c478bd9Sstevel@tonic-gate /* ===========================================================================
15177c478bd9Sstevel@tonic-gate * Local data. These are initialized only once.
15187c478bd9Sstevel@tonic-gate * To do: initialize at compile time to be completely reentrant. ???
15197c478bd9Sstevel@tonic-gate */
15207c478bd9Sstevel@tonic-gate
15217c478bd9Sstevel@tonic-gate local ct_data static_ltree[L_CODES+2];
15227c478bd9Sstevel@tonic-gate /* The static literal tree. Since the bit lengths are imposed, there is no
15237c478bd9Sstevel@tonic-gate * need for the L_CODES extra codes used during heap construction. However
15247c478bd9Sstevel@tonic-gate * The codes 286 and 287 are needed to build a canonical tree (see ct_init
15257c478bd9Sstevel@tonic-gate * below).
15267c478bd9Sstevel@tonic-gate */
15277c478bd9Sstevel@tonic-gate
15287c478bd9Sstevel@tonic-gate local ct_data static_dtree[D_CODES];
15297c478bd9Sstevel@tonic-gate /* The static distance tree. (Actually a trivial tree since all codes use
15307c478bd9Sstevel@tonic-gate * 5 bits.)
15317c478bd9Sstevel@tonic-gate */
15327c478bd9Sstevel@tonic-gate
15337c478bd9Sstevel@tonic-gate local uch dist_code[512];
15347c478bd9Sstevel@tonic-gate /* distance codes. The first 256 values correspond to the distances
15357c478bd9Sstevel@tonic-gate * 3 .. 258, the last 256 values correspond to the top 8 bits of
15367c478bd9Sstevel@tonic-gate * the 15 bit distances.
15377c478bd9Sstevel@tonic-gate */
15387c478bd9Sstevel@tonic-gate
15397c478bd9Sstevel@tonic-gate local uch length_code[MAX_MATCH-MIN_MATCH+1];
15407c478bd9Sstevel@tonic-gate /* length code for each normalized match length (0 == MIN_MATCH) */
15417c478bd9Sstevel@tonic-gate
15427c478bd9Sstevel@tonic-gate local int base_length[LENGTH_CODES];
15437c478bd9Sstevel@tonic-gate /* First normalized length for each code (0 = MIN_MATCH) */
15447c478bd9Sstevel@tonic-gate
15457c478bd9Sstevel@tonic-gate local int base_dist[D_CODES];
15467c478bd9Sstevel@tonic-gate /* First normalized distance for each code (0 = distance of 1) */
15477c478bd9Sstevel@tonic-gate
15487c478bd9Sstevel@tonic-gate struct static_tree_desc_s {
15497c478bd9Sstevel@tonic-gate ct_data *static_tree; /* static tree or NULL */
15507c478bd9Sstevel@tonic-gate intf *extra_bits; /* extra bits for each code or NULL */
15517c478bd9Sstevel@tonic-gate int extra_base; /* base index for extra_bits */
15527c478bd9Sstevel@tonic-gate int elems; /* max number of elements in the tree */
15537c478bd9Sstevel@tonic-gate int max_length; /* max bit length for the codes */
15547c478bd9Sstevel@tonic-gate };
15557c478bd9Sstevel@tonic-gate
15567c478bd9Sstevel@tonic-gate local static_tree_desc static_l_desc =
15577c478bd9Sstevel@tonic-gate {static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS};
15587c478bd9Sstevel@tonic-gate
15597c478bd9Sstevel@tonic-gate local static_tree_desc static_d_desc =
15607c478bd9Sstevel@tonic-gate {static_dtree, extra_dbits, 0, D_CODES, MAX_BITS};
15617c478bd9Sstevel@tonic-gate
15627c478bd9Sstevel@tonic-gate local static_tree_desc static_bl_desc =
15637c478bd9Sstevel@tonic-gate {(ct_data *)0, extra_blbits, 0, BL_CODES, MAX_BL_BITS};
15647c478bd9Sstevel@tonic-gate
15657c478bd9Sstevel@tonic-gate /* ===========================================================================
15667c478bd9Sstevel@tonic-gate * Local (static) routines in this file.
15677c478bd9Sstevel@tonic-gate */
15687c478bd9Sstevel@tonic-gate
15697c478bd9Sstevel@tonic-gate local void ct_static_init OF((void));
15707c478bd9Sstevel@tonic-gate local void init_block OF((deflate_state *s));
15717c478bd9Sstevel@tonic-gate local void pqdownheap OF((deflate_state *s, ct_data *tree, int k));
15727c478bd9Sstevel@tonic-gate local void gen_bitlen OF((deflate_state *s, tree_desc *desc));
15737c478bd9Sstevel@tonic-gate local void gen_codes OF((ct_data *tree, int max_code, ushf *bl_count));
15747c478bd9Sstevel@tonic-gate local void build_tree OF((deflate_state *s, tree_desc *desc));
15757c478bd9Sstevel@tonic-gate local void scan_tree OF((deflate_state *s, ct_data *tree, int max_code));
15767c478bd9Sstevel@tonic-gate local void send_tree OF((deflate_state *s, ct_data *tree, int max_code));
15777c478bd9Sstevel@tonic-gate local int build_bl_tree OF((deflate_state *s));
15787c478bd9Sstevel@tonic-gate local void send_all_trees OF((deflate_state *s, int lcodes, int dcodes,
15797c478bd9Sstevel@tonic-gate int blcodes));
15807c478bd9Sstevel@tonic-gate local void compress_block OF((deflate_state *s, ct_data *ltree,
15817c478bd9Sstevel@tonic-gate ct_data *dtree));
15827c478bd9Sstevel@tonic-gate local void set_data_type OF((deflate_state *s));
15837c478bd9Sstevel@tonic-gate local unsigned bi_reverse OF((unsigned value, int length));
15847c478bd9Sstevel@tonic-gate local void bi_windup OF((deflate_state *s));
15857c478bd9Sstevel@tonic-gate local void bi_flush OF((deflate_state *s));
15867c478bd9Sstevel@tonic-gate local void copy_block OF((deflate_state *s, charf *buf, unsigned len,
15877c478bd9Sstevel@tonic-gate int header));
15887c478bd9Sstevel@tonic-gate
15897c478bd9Sstevel@tonic-gate #ifndef DEBUG_ZLIB
15907c478bd9Sstevel@tonic-gate # define send_code(s, c, tree) send_bits(s, tree[c].Code, tree[c].Len)
15917c478bd9Sstevel@tonic-gate /* Send a code of the given tree. c and tree must not have side effects */
15927c478bd9Sstevel@tonic-gate
15937c478bd9Sstevel@tonic-gate #else /* DEBUG_ZLIB */
15947c478bd9Sstevel@tonic-gate # define send_code(s, c, tree) \
15957c478bd9Sstevel@tonic-gate { if (verbose>1) fprintf(stderr,"\ncd %3d ",(c)); \
15967c478bd9Sstevel@tonic-gate send_bits(s, tree[c].Code, tree[c].Len); }
15977c478bd9Sstevel@tonic-gate #endif
15987c478bd9Sstevel@tonic-gate
15997c478bd9Sstevel@tonic-gate #define d_code(dist) \
16007c478bd9Sstevel@tonic-gate ((dist) < 256 ? dist_code[dist] : dist_code[256+((dist)>>7)])
16017c478bd9Sstevel@tonic-gate /* Mapping from a distance to a distance code. dist is the distance - 1 and
16027c478bd9Sstevel@tonic-gate * must not have side effects. dist_code[256] and dist_code[257] are never
16037c478bd9Sstevel@tonic-gate * used.
16047c478bd9Sstevel@tonic-gate */
16057c478bd9Sstevel@tonic-gate
16067c478bd9Sstevel@tonic-gate /* ===========================================================================
16077c478bd9Sstevel@tonic-gate * Output a short LSB first on the stream.
16087c478bd9Sstevel@tonic-gate * IN assertion: there is enough room in pendingBuf.
16097c478bd9Sstevel@tonic-gate */
16107c478bd9Sstevel@tonic-gate #define put_short(s, w) { \
16117c478bd9Sstevel@tonic-gate put_byte(s, (uch)((w) & 0xff)); \
16127c478bd9Sstevel@tonic-gate put_byte(s, (uch)((ush)(w) >> 8)); \
16137c478bd9Sstevel@tonic-gate }
16147c478bd9Sstevel@tonic-gate
16157c478bd9Sstevel@tonic-gate /* ===========================================================================
16167c478bd9Sstevel@tonic-gate * Send a value on a given number of bits.
16177c478bd9Sstevel@tonic-gate * IN assertion: length <= 16 and value fits in length bits.
16187c478bd9Sstevel@tonic-gate */
16197c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
16207c478bd9Sstevel@tonic-gate local void send_bits OF((deflate_state *s, int value, int length));
16217c478bd9Sstevel@tonic-gate
send_bits(s,value,length)16227c478bd9Sstevel@tonic-gate local void send_bits(s, value, length)
16237c478bd9Sstevel@tonic-gate deflate_state *s;
16247c478bd9Sstevel@tonic-gate int value; /* value to send */
16257c478bd9Sstevel@tonic-gate int length; /* number of bits */
16267c478bd9Sstevel@tonic-gate {
16277c478bd9Sstevel@tonic-gate Tracev((stderr," l %2d v %4x ", length, value));
16287c478bd9Sstevel@tonic-gate Assert(length > 0 && length <= 15, "invalid length");
16297c478bd9Sstevel@tonic-gate s->bits_sent += (ulg)length;
16307c478bd9Sstevel@tonic-gate
16317c478bd9Sstevel@tonic-gate /* If not enough room in bi_buf, use (valid) bits from bi_buf and
16327c478bd9Sstevel@tonic-gate * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
16337c478bd9Sstevel@tonic-gate * unused bits in value.
16347c478bd9Sstevel@tonic-gate */
16357c478bd9Sstevel@tonic-gate if (s->bi_valid > (int)Buf_size - length) {
16367c478bd9Sstevel@tonic-gate s->bi_buf |= (value << s->bi_valid);
16377c478bd9Sstevel@tonic-gate put_short(s, s->bi_buf);
16387c478bd9Sstevel@tonic-gate s->bi_buf = (ush)value >> (Buf_size - s->bi_valid);
16397c478bd9Sstevel@tonic-gate s->bi_valid += length - Buf_size;
16407c478bd9Sstevel@tonic-gate } else {
16417c478bd9Sstevel@tonic-gate s->bi_buf |= value << s->bi_valid;
16427c478bd9Sstevel@tonic-gate s->bi_valid += length;
16437c478bd9Sstevel@tonic-gate }
16447c478bd9Sstevel@tonic-gate }
16457c478bd9Sstevel@tonic-gate #else /* !DEBUG_ZLIB */
16467c478bd9Sstevel@tonic-gate
16477c478bd9Sstevel@tonic-gate #define send_bits(s, value, length) \
16487c478bd9Sstevel@tonic-gate { int len = length;\
16497c478bd9Sstevel@tonic-gate if (s->bi_valid > (int)Buf_size - len) {\
16507c478bd9Sstevel@tonic-gate int val = value;\
16517c478bd9Sstevel@tonic-gate s->bi_buf |= (val << s->bi_valid);\
16527c478bd9Sstevel@tonic-gate put_short(s, s->bi_buf);\
16537c478bd9Sstevel@tonic-gate s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\
16547c478bd9Sstevel@tonic-gate s->bi_valid += len - Buf_size;\
16557c478bd9Sstevel@tonic-gate } else {\
16567c478bd9Sstevel@tonic-gate s->bi_buf |= (value) << s->bi_valid;\
16577c478bd9Sstevel@tonic-gate s->bi_valid += len;\
16587c478bd9Sstevel@tonic-gate }\
16597c478bd9Sstevel@tonic-gate }
16607c478bd9Sstevel@tonic-gate #endif /* DEBUG_ZLIB */
16617c478bd9Sstevel@tonic-gate
16627c478bd9Sstevel@tonic-gate
16637c478bd9Sstevel@tonic-gate #define MAX(a,b) (a >= b ? a : b)
16647c478bd9Sstevel@tonic-gate /* the arguments must not have side effects */
16657c478bd9Sstevel@tonic-gate
16667c478bd9Sstevel@tonic-gate /* ===========================================================================
16677c478bd9Sstevel@tonic-gate * Initialize the various 'constant' tables.
16687c478bd9Sstevel@tonic-gate * To do: do this at compile time.
16697c478bd9Sstevel@tonic-gate */
ct_static_init()16707c478bd9Sstevel@tonic-gate local void ct_static_init()
16717c478bd9Sstevel@tonic-gate {
16727c478bd9Sstevel@tonic-gate int n; /* iterates over tree elements */
16737c478bd9Sstevel@tonic-gate int bits; /* bit counter */
16747c478bd9Sstevel@tonic-gate int length; /* length value */
16757c478bd9Sstevel@tonic-gate int code; /* code value */
16767c478bd9Sstevel@tonic-gate int dist; /* distance index */
16777c478bd9Sstevel@tonic-gate ush bl_count[MAX_BITS+1];
16787c478bd9Sstevel@tonic-gate /* number of codes at each bit length for an optimal tree */
16797c478bd9Sstevel@tonic-gate
16807c478bd9Sstevel@tonic-gate /* Initialize the mapping length (0..255) -> length code (0..28) */
16817c478bd9Sstevel@tonic-gate length = 0;
16827c478bd9Sstevel@tonic-gate for (code = 0; code < LENGTH_CODES-1; code++) {
16837c478bd9Sstevel@tonic-gate base_length[code] = length;
16847c478bd9Sstevel@tonic-gate for (n = 0; n < (1<<extra_lbits[code]); n++) {
16857c478bd9Sstevel@tonic-gate length_code[length++] = (uch)code;
16867c478bd9Sstevel@tonic-gate }
16877c478bd9Sstevel@tonic-gate }
16887c478bd9Sstevel@tonic-gate Assert (length == 256, "ct_static_init: length != 256");
16897c478bd9Sstevel@tonic-gate /* Note that the length 255 (match length 258) can be represented
16907c478bd9Sstevel@tonic-gate * in two different ways: code 284 + 5 bits or code 285, so we
16917c478bd9Sstevel@tonic-gate * overwrite length_code[255] to use the best encoding:
16927c478bd9Sstevel@tonic-gate */
16937c478bd9Sstevel@tonic-gate length_code[length-1] = (uch)code;
16947c478bd9Sstevel@tonic-gate
16957c478bd9Sstevel@tonic-gate /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
16967c478bd9Sstevel@tonic-gate dist = 0;
16977c478bd9Sstevel@tonic-gate for (code = 0 ; code < 16; code++) {
16987c478bd9Sstevel@tonic-gate base_dist[code] = dist;
16997c478bd9Sstevel@tonic-gate for (n = 0; n < (1<<extra_dbits[code]); n++) {
17007c478bd9Sstevel@tonic-gate dist_code[dist++] = (uch)code;
17017c478bd9Sstevel@tonic-gate }
17027c478bd9Sstevel@tonic-gate }
17037c478bd9Sstevel@tonic-gate Assert (dist == 256, "ct_static_init: dist != 256");
17047c478bd9Sstevel@tonic-gate dist >>= 7; /* from now on, all distances are divided by 128 */
17057c478bd9Sstevel@tonic-gate for ( ; code < D_CODES; code++) {
17067c478bd9Sstevel@tonic-gate base_dist[code] = dist << 7;
17077c478bd9Sstevel@tonic-gate for (n = 0; n < (1<<(extra_dbits[code]-7)); n++) {
17087c478bd9Sstevel@tonic-gate dist_code[256 + dist++] = (uch)code;
17097c478bd9Sstevel@tonic-gate }
17107c478bd9Sstevel@tonic-gate }
17117c478bd9Sstevel@tonic-gate Assert (dist == 256, "ct_static_init: 256+dist != 512");
17127c478bd9Sstevel@tonic-gate
17137c478bd9Sstevel@tonic-gate /* Construct the codes of the static literal tree */
17147c478bd9Sstevel@tonic-gate for (bits = 0; bits <= MAX_BITS; bits++) bl_count[bits] = 0;
17157c478bd9Sstevel@tonic-gate n = 0;
17167c478bd9Sstevel@tonic-gate while (n <= 143) static_ltree[n++].Len = 8, bl_count[8]++;
17177c478bd9Sstevel@tonic-gate while (n <= 255) static_ltree[n++].Len = 9, bl_count[9]++;
17187c478bd9Sstevel@tonic-gate while (n <= 279) static_ltree[n++].Len = 7, bl_count[7]++;
17197c478bd9Sstevel@tonic-gate while (n <= 287) static_ltree[n++].Len = 8, bl_count[8]++;
17207c478bd9Sstevel@tonic-gate /* Codes 286 and 287 do not exist, but we must include them in the
17217c478bd9Sstevel@tonic-gate * tree construction to get a canonical Huffman tree (longest code
17227c478bd9Sstevel@tonic-gate * all ones)
17237c478bd9Sstevel@tonic-gate */
17247c478bd9Sstevel@tonic-gate gen_codes((ct_data *)static_ltree, L_CODES+1, bl_count);
17257c478bd9Sstevel@tonic-gate
17267c478bd9Sstevel@tonic-gate /* The static distance tree is trivial: */
17277c478bd9Sstevel@tonic-gate for (n = 0; n < D_CODES; n++) {
17287c478bd9Sstevel@tonic-gate static_dtree[n].Len = 5;
17297c478bd9Sstevel@tonic-gate static_dtree[n].Code = bi_reverse(n, 5);
17307c478bd9Sstevel@tonic-gate }
17317c478bd9Sstevel@tonic-gate }
17327c478bd9Sstevel@tonic-gate
17337c478bd9Sstevel@tonic-gate /* ===========================================================================
17347c478bd9Sstevel@tonic-gate * Initialize the tree data structures for a new zlib stream.
17357c478bd9Sstevel@tonic-gate */
ct_init(s)17367c478bd9Sstevel@tonic-gate local void ct_init(s)
17377c478bd9Sstevel@tonic-gate deflate_state *s;
17387c478bd9Sstevel@tonic-gate {
17397c478bd9Sstevel@tonic-gate if (static_dtree[0].Len == 0) {
17407c478bd9Sstevel@tonic-gate ct_static_init(); /* To do: at compile time */
17417c478bd9Sstevel@tonic-gate }
17427c478bd9Sstevel@tonic-gate
17437c478bd9Sstevel@tonic-gate s->compressed_len = 0L;
17447c478bd9Sstevel@tonic-gate
17457c478bd9Sstevel@tonic-gate s->l_desc.dyn_tree = s->dyn_ltree;
17467c478bd9Sstevel@tonic-gate s->l_desc.stat_desc = &static_l_desc;
17477c478bd9Sstevel@tonic-gate
17487c478bd9Sstevel@tonic-gate s->d_desc.dyn_tree = s->dyn_dtree;
17497c478bd9Sstevel@tonic-gate s->d_desc.stat_desc = &static_d_desc;
17507c478bd9Sstevel@tonic-gate
17517c478bd9Sstevel@tonic-gate s->bl_desc.dyn_tree = s->bl_tree;
17527c478bd9Sstevel@tonic-gate s->bl_desc.stat_desc = &static_bl_desc;
17537c478bd9Sstevel@tonic-gate
17547c478bd9Sstevel@tonic-gate s->bi_buf = 0;
17557c478bd9Sstevel@tonic-gate s->bi_valid = 0;
17567c478bd9Sstevel@tonic-gate s->last_eob_len = 8; /* enough lookahead for inflate */
17577c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
17587c478bd9Sstevel@tonic-gate s->bits_sent = 0L;
17597c478bd9Sstevel@tonic-gate #endif
17607c478bd9Sstevel@tonic-gate s->blocks_in_packet = 0;
17617c478bd9Sstevel@tonic-gate
17627c478bd9Sstevel@tonic-gate /* Initialize the first block of the first file: */
17637c478bd9Sstevel@tonic-gate init_block(s);
17647c478bd9Sstevel@tonic-gate }
17657c478bd9Sstevel@tonic-gate
17667c478bd9Sstevel@tonic-gate /* ===========================================================================
17677c478bd9Sstevel@tonic-gate * Initialize a new block.
17687c478bd9Sstevel@tonic-gate */
init_block(s)17697c478bd9Sstevel@tonic-gate local void init_block(s)
17707c478bd9Sstevel@tonic-gate deflate_state *s;
17717c478bd9Sstevel@tonic-gate {
17727c478bd9Sstevel@tonic-gate int n; /* iterates over tree elements */
17737c478bd9Sstevel@tonic-gate
17747c478bd9Sstevel@tonic-gate /* Initialize the trees. */
17757c478bd9Sstevel@tonic-gate for (n = 0; n < L_CODES; n++) s->dyn_ltree[n].Freq = 0;
17767c478bd9Sstevel@tonic-gate for (n = 0; n < D_CODES; n++) s->dyn_dtree[n].Freq = 0;
17777c478bd9Sstevel@tonic-gate for (n = 0; n < BL_CODES; n++) s->bl_tree[n].Freq = 0;
17787c478bd9Sstevel@tonic-gate
17797c478bd9Sstevel@tonic-gate s->dyn_ltree[END_BLOCK].Freq = 1;
17807c478bd9Sstevel@tonic-gate s->opt_len = s->static_len = 0L;
17817c478bd9Sstevel@tonic-gate s->last_lit = s->matches = 0;
17827c478bd9Sstevel@tonic-gate }
17837c478bd9Sstevel@tonic-gate
17847c478bd9Sstevel@tonic-gate #define SMALLEST 1
17857c478bd9Sstevel@tonic-gate /* Index within the heap array of least frequent node in the Huffman tree */
17867c478bd9Sstevel@tonic-gate
17877c478bd9Sstevel@tonic-gate
17887c478bd9Sstevel@tonic-gate /* ===========================================================================
17897c478bd9Sstevel@tonic-gate * Remove the smallest element from the heap and recreate the heap with
17907c478bd9Sstevel@tonic-gate * one less element. Updates heap and heap_len.
17917c478bd9Sstevel@tonic-gate */
17927c478bd9Sstevel@tonic-gate #define pqremove(s, tree, top) \
17937c478bd9Sstevel@tonic-gate {\
17947c478bd9Sstevel@tonic-gate top = s->heap[SMALLEST]; \
17957c478bd9Sstevel@tonic-gate s->heap[SMALLEST] = s->heap[s->heap_len--]; \
17967c478bd9Sstevel@tonic-gate pqdownheap(s, tree, SMALLEST); \
17977c478bd9Sstevel@tonic-gate }
17987c478bd9Sstevel@tonic-gate
17997c478bd9Sstevel@tonic-gate /* ===========================================================================
18007c478bd9Sstevel@tonic-gate * Compares to subtrees, using the tree depth as tie breaker when
18017c478bd9Sstevel@tonic-gate * the subtrees have equal frequency. This minimizes the worst case length.
18027c478bd9Sstevel@tonic-gate */
18037c478bd9Sstevel@tonic-gate #define smaller(tree, n, m, depth) \
18047c478bd9Sstevel@tonic-gate (tree[n].Freq < tree[m].Freq || \
18057c478bd9Sstevel@tonic-gate (tree[n].Freq == tree[m].Freq && depth[n] <= depth[m]))
18067c478bd9Sstevel@tonic-gate
18077c478bd9Sstevel@tonic-gate /* ===========================================================================
18087c478bd9Sstevel@tonic-gate * Restore the heap property by moving down the tree starting at node k,
18097c478bd9Sstevel@tonic-gate * exchanging a node with the smallest of its two sons if necessary, stopping
18107c478bd9Sstevel@tonic-gate * when the heap property is re-established (each father smaller than its
18117c478bd9Sstevel@tonic-gate * two sons).
18127c478bd9Sstevel@tonic-gate */
pqdownheap(s,tree,k)18137c478bd9Sstevel@tonic-gate local void pqdownheap(s, tree, k)
18147c478bd9Sstevel@tonic-gate deflate_state *s;
18157c478bd9Sstevel@tonic-gate ct_data *tree; /* the tree to restore */
18167c478bd9Sstevel@tonic-gate int k; /* node to move down */
18177c478bd9Sstevel@tonic-gate {
18187c478bd9Sstevel@tonic-gate int v = s->heap[k];
18197c478bd9Sstevel@tonic-gate int j = k << 1; /* left son of k */
18207c478bd9Sstevel@tonic-gate while (j <= s->heap_len) {
18217c478bd9Sstevel@tonic-gate /* Set j to the smallest of the two sons: */
18227c478bd9Sstevel@tonic-gate if (j < s->heap_len &&
18237c478bd9Sstevel@tonic-gate smaller(tree, s->heap[j+1], s->heap[j], s->depth)) {
18247c478bd9Sstevel@tonic-gate j++;
18257c478bd9Sstevel@tonic-gate }
18267c478bd9Sstevel@tonic-gate /* Exit if v is smaller than both sons */
18277c478bd9Sstevel@tonic-gate if (smaller(tree, v, s->heap[j], s->depth)) break;
18287c478bd9Sstevel@tonic-gate
18297c478bd9Sstevel@tonic-gate /* Exchange v with the smallest son */
18307c478bd9Sstevel@tonic-gate s->heap[k] = s->heap[j]; k = j;
18317c478bd9Sstevel@tonic-gate
18327c478bd9Sstevel@tonic-gate /* And continue down the tree, setting j to the left son of k */
18337c478bd9Sstevel@tonic-gate j <<= 1;
18347c478bd9Sstevel@tonic-gate }
18357c478bd9Sstevel@tonic-gate s->heap[k] = v;
18367c478bd9Sstevel@tonic-gate }
18377c478bd9Sstevel@tonic-gate
18387c478bd9Sstevel@tonic-gate /* ===========================================================================
18397c478bd9Sstevel@tonic-gate * Compute the optimal bit lengths for a tree and update the total bit length
18407c478bd9Sstevel@tonic-gate * for the current block.
18417c478bd9Sstevel@tonic-gate * IN assertion: the fields freq and dad are set, heap[heap_max] and
18427c478bd9Sstevel@tonic-gate * above are the tree nodes sorted by increasing frequency.
18437c478bd9Sstevel@tonic-gate * OUT assertions: the field len is set to the optimal bit length, the
18447c478bd9Sstevel@tonic-gate * array bl_count contains the frequencies for each bit length.
18457c478bd9Sstevel@tonic-gate * The length opt_len is updated; static_len is also updated if stree is
18467c478bd9Sstevel@tonic-gate * not null.
18477c478bd9Sstevel@tonic-gate */
gen_bitlen(s,desc)18487c478bd9Sstevel@tonic-gate local void gen_bitlen(s, desc)
18497c478bd9Sstevel@tonic-gate deflate_state *s;
18507c478bd9Sstevel@tonic-gate tree_desc *desc; /* the tree descriptor */
18517c478bd9Sstevel@tonic-gate {
18527c478bd9Sstevel@tonic-gate ct_data *tree = desc->dyn_tree;
18537c478bd9Sstevel@tonic-gate int max_code = desc->max_code;
18547c478bd9Sstevel@tonic-gate ct_data *stree = desc->stat_desc->static_tree;
18557c478bd9Sstevel@tonic-gate intf *extra = desc->stat_desc->extra_bits;
18567c478bd9Sstevel@tonic-gate int base = desc->stat_desc->extra_base;
18577c478bd9Sstevel@tonic-gate int max_length = desc->stat_desc->max_length;
18587c478bd9Sstevel@tonic-gate int h; /* heap index */
18597c478bd9Sstevel@tonic-gate int n, m; /* iterate over the tree elements */
18607c478bd9Sstevel@tonic-gate int bits; /* bit length */
18617c478bd9Sstevel@tonic-gate int xbits; /* extra bits */
18627c478bd9Sstevel@tonic-gate ush f; /* frequency */
18637c478bd9Sstevel@tonic-gate int overflow = 0; /* number of elements with bit length too large */
18647c478bd9Sstevel@tonic-gate
18657c478bd9Sstevel@tonic-gate for (bits = 0; bits <= MAX_BITS; bits++) s->bl_count[bits] = 0;
18667c478bd9Sstevel@tonic-gate
18677c478bd9Sstevel@tonic-gate /* In a first pass, compute the optimal bit lengths (which may
18687c478bd9Sstevel@tonic-gate * overflow in the case of the bit length tree).
18697c478bd9Sstevel@tonic-gate */
18707c478bd9Sstevel@tonic-gate tree[s->heap[s->heap_max]].Len = 0; /* root of the heap */
18717c478bd9Sstevel@tonic-gate
18727c478bd9Sstevel@tonic-gate for (h = s->heap_max+1; h < HEAP_SIZE; h++) {
18737c478bd9Sstevel@tonic-gate n = s->heap[h];
18747c478bd9Sstevel@tonic-gate bits = tree[tree[n].Dad].Len + 1;
18757c478bd9Sstevel@tonic-gate if (bits > max_length) bits = max_length, overflow++;
18767c478bd9Sstevel@tonic-gate tree[n].Len = (ush)bits;
18777c478bd9Sstevel@tonic-gate /* We overwrite tree[n].Dad which is no longer needed */
18787c478bd9Sstevel@tonic-gate
18797c478bd9Sstevel@tonic-gate if (n > max_code) continue; /* not a leaf node */
18807c478bd9Sstevel@tonic-gate
18817c478bd9Sstevel@tonic-gate s->bl_count[bits]++;
18827c478bd9Sstevel@tonic-gate xbits = 0;
18837c478bd9Sstevel@tonic-gate if (n >= base) xbits = extra[n-base];
18847c478bd9Sstevel@tonic-gate f = tree[n].Freq;
18857c478bd9Sstevel@tonic-gate s->opt_len += (ulg)f * (bits + xbits);
18867c478bd9Sstevel@tonic-gate if (stree) s->static_len += (ulg)f * (stree[n].Len + xbits);
18877c478bd9Sstevel@tonic-gate }
18887c478bd9Sstevel@tonic-gate if (overflow == 0) return;
18897c478bd9Sstevel@tonic-gate
18907c478bd9Sstevel@tonic-gate Trace((stderr,"\nbit length overflow\n"));
18917c478bd9Sstevel@tonic-gate /* This happens for example on obj2 and pic of the Calgary corpus */
18927c478bd9Sstevel@tonic-gate
18937c478bd9Sstevel@tonic-gate /* Find the first bit length which could increase: */
18947c478bd9Sstevel@tonic-gate do {
18957c478bd9Sstevel@tonic-gate bits = max_length-1;
18967c478bd9Sstevel@tonic-gate while (s->bl_count[bits] == 0) bits--;
18977c478bd9Sstevel@tonic-gate s->bl_count[bits]--; /* move one leaf down the tree */
18987c478bd9Sstevel@tonic-gate s->bl_count[bits+1] += 2; /* move one overflow item as its brother */
18997c478bd9Sstevel@tonic-gate s->bl_count[max_length]--;
19007c478bd9Sstevel@tonic-gate /* The brother of the overflow item also moves one step up,
19017c478bd9Sstevel@tonic-gate * but this does not affect bl_count[max_length]
19027c478bd9Sstevel@tonic-gate */
19037c478bd9Sstevel@tonic-gate overflow -= 2;
19047c478bd9Sstevel@tonic-gate } while (overflow > 0);
19057c478bd9Sstevel@tonic-gate
19067c478bd9Sstevel@tonic-gate /* Now recompute all bit lengths, scanning in increasing frequency.
19077c478bd9Sstevel@tonic-gate * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
19087c478bd9Sstevel@tonic-gate * lengths instead of fixing only the wrong ones. This idea is taken
19097c478bd9Sstevel@tonic-gate * from 'ar' written by Haruhiko Okumura.)
19107c478bd9Sstevel@tonic-gate */
19117c478bd9Sstevel@tonic-gate for (bits = max_length; bits != 0; bits--) {
19127c478bd9Sstevel@tonic-gate n = s->bl_count[bits];
19137c478bd9Sstevel@tonic-gate while (n != 0) {
19147c478bd9Sstevel@tonic-gate m = s->heap[--h];
19157c478bd9Sstevel@tonic-gate if (m > max_code) continue;
19167c478bd9Sstevel@tonic-gate if (tree[m].Len != (unsigned) bits) {
19177c478bd9Sstevel@tonic-gate Trace((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
19187c478bd9Sstevel@tonic-gate s->opt_len += ((long)bits - (long)tree[m].Len)
19197c478bd9Sstevel@tonic-gate *(long)tree[m].Freq;
19207c478bd9Sstevel@tonic-gate tree[m].Len = (ush)bits;
19217c478bd9Sstevel@tonic-gate }
19227c478bd9Sstevel@tonic-gate n--;
19237c478bd9Sstevel@tonic-gate }
19247c478bd9Sstevel@tonic-gate }
19257c478bd9Sstevel@tonic-gate }
19267c478bd9Sstevel@tonic-gate
19277c478bd9Sstevel@tonic-gate /* ===========================================================================
19287c478bd9Sstevel@tonic-gate * Generate the codes for a given tree and bit counts (which need not be
19297c478bd9Sstevel@tonic-gate * optimal).
19307c478bd9Sstevel@tonic-gate * IN assertion: the array bl_count contains the bit length statistics for
19317c478bd9Sstevel@tonic-gate * the given tree and the field len is set for all tree elements.
19327c478bd9Sstevel@tonic-gate * OUT assertion: the field code is set for all tree elements of non
19337c478bd9Sstevel@tonic-gate * zero code length.
19347c478bd9Sstevel@tonic-gate */
gen_codes(tree,max_code,bl_count)19357c478bd9Sstevel@tonic-gate local void gen_codes (tree, max_code, bl_count)
19367c478bd9Sstevel@tonic-gate ct_data *tree; /* the tree to decorate */
19377c478bd9Sstevel@tonic-gate int max_code; /* largest code with non zero frequency */
19387c478bd9Sstevel@tonic-gate ushf *bl_count; /* number of codes at each bit length */
19397c478bd9Sstevel@tonic-gate {
19407c478bd9Sstevel@tonic-gate ush next_code[MAX_BITS+1]; /* next code value for each bit length */
19417c478bd9Sstevel@tonic-gate ush code = 0; /* running code value */
19427c478bd9Sstevel@tonic-gate int bits; /* bit index */
19437c478bd9Sstevel@tonic-gate int n; /* code index */
19447c478bd9Sstevel@tonic-gate
19457c478bd9Sstevel@tonic-gate /* The distribution counts are first used to generate the code values
19467c478bd9Sstevel@tonic-gate * without bit reversal.
19477c478bd9Sstevel@tonic-gate */
19487c478bd9Sstevel@tonic-gate for (bits = 1; bits <= MAX_BITS; bits++) {
19497c478bd9Sstevel@tonic-gate next_code[bits] = code = (code + bl_count[bits-1]) << 1;
19507c478bd9Sstevel@tonic-gate }
19517c478bd9Sstevel@tonic-gate /* Check that the bit counts in bl_count are consistent. The last code
19527c478bd9Sstevel@tonic-gate * must be all ones.
19537c478bd9Sstevel@tonic-gate */
19547c478bd9Sstevel@tonic-gate Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
19557c478bd9Sstevel@tonic-gate "inconsistent bit counts");
19567c478bd9Sstevel@tonic-gate Tracev((stderr,"\ngen_codes: max_code %d ", max_code));
19577c478bd9Sstevel@tonic-gate
19587c478bd9Sstevel@tonic-gate for (n = 0; n <= max_code; n++) {
19597c478bd9Sstevel@tonic-gate int len = tree[n].Len;
19607c478bd9Sstevel@tonic-gate if (len == 0) continue;
19617c478bd9Sstevel@tonic-gate /* Now reverse the bits */
19627c478bd9Sstevel@tonic-gate tree[n].Code = bi_reverse(next_code[len]++, len);
19637c478bd9Sstevel@tonic-gate
19647c478bd9Sstevel@tonic-gate Tracec(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
19657c478bd9Sstevel@tonic-gate n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
19667c478bd9Sstevel@tonic-gate }
19677c478bd9Sstevel@tonic-gate }
19687c478bd9Sstevel@tonic-gate
19697c478bd9Sstevel@tonic-gate /* ===========================================================================
19707c478bd9Sstevel@tonic-gate * Construct one Huffman tree and assigns the code bit strings and lengths.
19717c478bd9Sstevel@tonic-gate * Update the total bit length for the current block.
19727c478bd9Sstevel@tonic-gate * IN assertion: the field freq is set for all tree elements.
19737c478bd9Sstevel@tonic-gate * OUT assertions: the fields len and code are set to the optimal bit length
19747c478bd9Sstevel@tonic-gate * and corresponding code. The length opt_len is updated; static_len is
19757c478bd9Sstevel@tonic-gate * also updated if stree is not null. The field max_code is set.
19767c478bd9Sstevel@tonic-gate */
build_tree(s,desc)19777c478bd9Sstevel@tonic-gate local void build_tree(s, desc)
19787c478bd9Sstevel@tonic-gate deflate_state *s;
19797c478bd9Sstevel@tonic-gate tree_desc *desc; /* the tree descriptor */
19807c478bd9Sstevel@tonic-gate {
19817c478bd9Sstevel@tonic-gate ct_data *tree = desc->dyn_tree;
19827c478bd9Sstevel@tonic-gate ct_data *stree = desc->stat_desc->static_tree;
19837c478bd9Sstevel@tonic-gate int elems = desc->stat_desc->elems;
19847c478bd9Sstevel@tonic-gate int n, m; /* iterate over heap elements */
19857c478bd9Sstevel@tonic-gate int max_code = -1; /* largest code with non zero frequency */
19867c478bd9Sstevel@tonic-gate int node; /* new node being created */
19877c478bd9Sstevel@tonic-gate
19887c478bd9Sstevel@tonic-gate /* Construct the initial heap, with least frequent element in
19897c478bd9Sstevel@tonic-gate * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
19907c478bd9Sstevel@tonic-gate * heap[0] is not used.
19917c478bd9Sstevel@tonic-gate */
19927c478bd9Sstevel@tonic-gate s->heap_len = 0, s->heap_max = HEAP_SIZE;
19937c478bd9Sstevel@tonic-gate
19947c478bd9Sstevel@tonic-gate for (n = 0; n < elems; n++) {
19957c478bd9Sstevel@tonic-gate if (tree[n].Freq != 0) {
19967c478bd9Sstevel@tonic-gate s->heap[++(s->heap_len)] = max_code = n;
19977c478bd9Sstevel@tonic-gate s->depth[n] = 0;
19987c478bd9Sstevel@tonic-gate } else {
19997c478bd9Sstevel@tonic-gate tree[n].Len = 0;
20007c478bd9Sstevel@tonic-gate }
20017c478bd9Sstevel@tonic-gate }
20027c478bd9Sstevel@tonic-gate
20037c478bd9Sstevel@tonic-gate /* The pkzip format requires that at least one distance code exists,
20047c478bd9Sstevel@tonic-gate * and that at least one bit should be sent even if there is only one
20057c478bd9Sstevel@tonic-gate * possible code. So to avoid special checks later on we force at least
20067c478bd9Sstevel@tonic-gate * two codes of non zero frequency.
20077c478bd9Sstevel@tonic-gate */
20087c478bd9Sstevel@tonic-gate while (s->heap_len < 2) {
20097c478bd9Sstevel@tonic-gate node = s->heap[++(s->heap_len)] = (max_code < 2 ? ++max_code : 0);
20107c478bd9Sstevel@tonic-gate tree[node].Freq = 1;
20117c478bd9Sstevel@tonic-gate s->depth[node] = 0;
20127c478bd9Sstevel@tonic-gate s->opt_len--; if (stree) s->static_len -= stree[node].Len;
20137c478bd9Sstevel@tonic-gate /* node is 0 or 1 so it does not have extra bits */
20147c478bd9Sstevel@tonic-gate }
20157c478bd9Sstevel@tonic-gate desc->max_code = max_code;
20167c478bd9Sstevel@tonic-gate
20177c478bd9Sstevel@tonic-gate /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
20187c478bd9Sstevel@tonic-gate * establish sub-heaps of increasing lengths:
20197c478bd9Sstevel@tonic-gate */
20207c478bd9Sstevel@tonic-gate for (n = s->heap_len/2; n >= 1; n--) pqdownheap(s, tree, n);
20217c478bd9Sstevel@tonic-gate
20227c478bd9Sstevel@tonic-gate /* Construct the Huffman tree by repeatedly combining the least two
20237c478bd9Sstevel@tonic-gate * frequent nodes.
20247c478bd9Sstevel@tonic-gate */
20257c478bd9Sstevel@tonic-gate node = elems; /* next internal node of the tree */
20267c478bd9Sstevel@tonic-gate do {
20277c478bd9Sstevel@tonic-gate pqremove(s, tree, n); /* n = node of least frequency */
20287c478bd9Sstevel@tonic-gate m = s->heap[SMALLEST]; /* m = node of next least frequency */
20297c478bd9Sstevel@tonic-gate
20307c478bd9Sstevel@tonic-gate s->heap[--(s->heap_max)] = n; /* keep the nodes sorted by frequency */
20317c478bd9Sstevel@tonic-gate s->heap[--(s->heap_max)] = m;
20327c478bd9Sstevel@tonic-gate
20337c478bd9Sstevel@tonic-gate /* Create a new node father of n and m */
20347c478bd9Sstevel@tonic-gate tree[node].Freq = tree[n].Freq + tree[m].Freq;
20357c478bd9Sstevel@tonic-gate s->depth[node] = (uch) (MAX(s->depth[n], s->depth[m]) + 1);
20367c478bd9Sstevel@tonic-gate tree[n].Dad = tree[m].Dad = (ush)node;
20377c478bd9Sstevel@tonic-gate #ifdef DUMP_BL_TREE
20387c478bd9Sstevel@tonic-gate if (tree == s->bl_tree) {
20397c478bd9Sstevel@tonic-gate fprintf(stderr,"\nnode %d(%d), sons %d(%d) %d(%d)",
20407c478bd9Sstevel@tonic-gate node, tree[node].Freq, n, tree[n].Freq, m, tree[m].Freq);
20417c478bd9Sstevel@tonic-gate }
20427c478bd9Sstevel@tonic-gate #endif
20437c478bd9Sstevel@tonic-gate /* and insert the new node in the heap */
20447c478bd9Sstevel@tonic-gate s->heap[SMALLEST] = node++;
20457c478bd9Sstevel@tonic-gate pqdownheap(s, tree, SMALLEST);
20467c478bd9Sstevel@tonic-gate
20477c478bd9Sstevel@tonic-gate } while (s->heap_len >= 2);
20487c478bd9Sstevel@tonic-gate
20497c478bd9Sstevel@tonic-gate s->heap[--(s->heap_max)] = s->heap[SMALLEST];
20507c478bd9Sstevel@tonic-gate
20517c478bd9Sstevel@tonic-gate /* At this point, the fields freq and dad are set. We can now
20527c478bd9Sstevel@tonic-gate * generate the bit lengths.
20537c478bd9Sstevel@tonic-gate */
20547c478bd9Sstevel@tonic-gate gen_bitlen(s, (tree_desc *)desc);
20557c478bd9Sstevel@tonic-gate
20567c478bd9Sstevel@tonic-gate /* The field len is now set, we can generate the bit codes */
20577c478bd9Sstevel@tonic-gate gen_codes ((ct_data *)tree, max_code, s->bl_count);
20587c478bd9Sstevel@tonic-gate }
20597c478bd9Sstevel@tonic-gate
20607c478bd9Sstevel@tonic-gate /* ===========================================================================
20617c478bd9Sstevel@tonic-gate * Scan a literal or distance tree to determine the frequencies of the codes
20627c478bd9Sstevel@tonic-gate * in the bit length tree.
20637c478bd9Sstevel@tonic-gate */
scan_tree(s,tree,max_code)20647c478bd9Sstevel@tonic-gate local void scan_tree (s, tree, max_code)
20657c478bd9Sstevel@tonic-gate deflate_state *s;
20667c478bd9Sstevel@tonic-gate ct_data *tree; /* the tree to be scanned */
20677c478bd9Sstevel@tonic-gate int max_code; /* and its largest code of non zero frequency */
20687c478bd9Sstevel@tonic-gate {
20697c478bd9Sstevel@tonic-gate int n; /* iterates over all tree elements */
20707c478bd9Sstevel@tonic-gate int prevlen = -1; /* last emitted length */
20717c478bd9Sstevel@tonic-gate int curlen; /* length of current code */
20727c478bd9Sstevel@tonic-gate int nextlen = tree[0].Len; /* length of next code */
20737c478bd9Sstevel@tonic-gate int count = 0; /* repeat count of the current code */
20747c478bd9Sstevel@tonic-gate int max_count = 7; /* max repeat count */
20757c478bd9Sstevel@tonic-gate int min_count = 4; /* min repeat count */
20767c478bd9Sstevel@tonic-gate
20777c478bd9Sstevel@tonic-gate if (nextlen == 0) max_count = 138, min_count = 3;
20787c478bd9Sstevel@tonic-gate tree[max_code+1].Len = (ush)0xffff; /* guard */
20797c478bd9Sstevel@tonic-gate
20807c478bd9Sstevel@tonic-gate for (n = 0; n <= max_code; n++) {
20817c478bd9Sstevel@tonic-gate curlen = nextlen; nextlen = tree[n+1].Len;
20827c478bd9Sstevel@tonic-gate if (++count < max_count && curlen == nextlen) {
20837c478bd9Sstevel@tonic-gate continue;
20847c478bd9Sstevel@tonic-gate } else if (count < min_count) {
20857c478bd9Sstevel@tonic-gate s->bl_tree[curlen].Freq += count;
20867c478bd9Sstevel@tonic-gate } else if (curlen != 0) {
20877c478bd9Sstevel@tonic-gate if (curlen != prevlen) s->bl_tree[curlen].Freq++;
20887c478bd9Sstevel@tonic-gate s->bl_tree[REP_3_6].Freq++;
20897c478bd9Sstevel@tonic-gate } else if (count <= 10) {
20907c478bd9Sstevel@tonic-gate s->bl_tree[REPZ_3_10].Freq++;
20917c478bd9Sstevel@tonic-gate } else {
20927c478bd9Sstevel@tonic-gate s->bl_tree[REPZ_11_138].Freq++;
20937c478bd9Sstevel@tonic-gate }
20947c478bd9Sstevel@tonic-gate count = 0; prevlen = curlen;
20957c478bd9Sstevel@tonic-gate if (nextlen == 0) {
20967c478bd9Sstevel@tonic-gate max_count = 138, min_count = 3;
20977c478bd9Sstevel@tonic-gate } else if (curlen == nextlen) {
20987c478bd9Sstevel@tonic-gate max_count = 6, min_count = 3;
20997c478bd9Sstevel@tonic-gate } else {
21007c478bd9Sstevel@tonic-gate max_count = 7, min_count = 4;
21017c478bd9Sstevel@tonic-gate }
21027c478bd9Sstevel@tonic-gate }
21037c478bd9Sstevel@tonic-gate }
21047c478bd9Sstevel@tonic-gate
21057c478bd9Sstevel@tonic-gate /* ===========================================================================
21067c478bd9Sstevel@tonic-gate * Send a literal or distance tree in compressed form, using the codes in
21077c478bd9Sstevel@tonic-gate * bl_tree.
21087c478bd9Sstevel@tonic-gate */
send_tree(s,tree,max_code)21097c478bd9Sstevel@tonic-gate local void send_tree (s, tree, max_code)
21107c478bd9Sstevel@tonic-gate deflate_state *s;
21117c478bd9Sstevel@tonic-gate ct_data *tree; /* the tree to be scanned */
21127c478bd9Sstevel@tonic-gate int max_code; /* and its largest code of non zero frequency */
21137c478bd9Sstevel@tonic-gate {
21147c478bd9Sstevel@tonic-gate int n; /* iterates over all tree elements */
21157c478bd9Sstevel@tonic-gate int prevlen = -1; /* last emitted length */
21167c478bd9Sstevel@tonic-gate int curlen; /* length of current code */
21177c478bd9Sstevel@tonic-gate int nextlen = tree[0].Len; /* length of next code */
21187c478bd9Sstevel@tonic-gate int count = 0; /* repeat count of the current code */
21197c478bd9Sstevel@tonic-gate int max_count = 7; /* max repeat count */
21207c478bd9Sstevel@tonic-gate int min_count = 4; /* min repeat count */
21217c478bd9Sstevel@tonic-gate
21227c478bd9Sstevel@tonic-gate /* tree[max_code+1].Len = -1; */ /* guard already set */
21237c478bd9Sstevel@tonic-gate if (nextlen == 0) max_count = 138, min_count = 3;
21247c478bd9Sstevel@tonic-gate
21257c478bd9Sstevel@tonic-gate for (n = 0; n <= max_code; n++) {
21267c478bd9Sstevel@tonic-gate curlen = nextlen; nextlen = tree[n+1].Len;
21277c478bd9Sstevel@tonic-gate if (++count < max_count && curlen == nextlen) {
21287c478bd9Sstevel@tonic-gate continue;
21297c478bd9Sstevel@tonic-gate } else if (count < min_count) {
21307c478bd9Sstevel@tonic-gate do { send_code(s, curlen, s->bl_tree); } while (--count != 0);
21317c478bd9Sstevel@tonic-gate
21327c478bd9Sstevel@tonic-gate } else if (curlen != 0) {
21337c478bd9Sstevel@tonic-gate if (curlen != prevlen) {
21347c478bd9Sstevel@tonic-gate send_code(s, curlen, s->bl_tree); count--;
21357c478bd9Sstevel@tonic-gate }
21367c478bd9Sstevel@tonic-gate Assert(count >= 3 && count <= 6, " 3_6?");
21377c478bd9Sstevel@tonic-gate send_code(s, REP_3_6, s->bl_tree); send_bits(s, count-3, 2);
21387c478bd9Sstevel@tonic-gate
21397c478bd9Sstevel@tonic-gate } else if (count <= 10) {
21407c478bd9Sstevel@tonic-gate send_code(s, REPZ_3_10, s->bl_tree); send_bits(s, count-3, 3);
21417c478bd9Sstevel@tonic-gate
21427c478bd9Sstevel@tonic-gate } else {
21437c478bd9Sstevel@tonic-gate send_code(s, REPZ_11_138, s->bl_tree); send_bits(s, count-11, 7);
21447c478bd9Sstevel@tonic-gate }
21457c478bd9Sstevel@tonic-gate count = 0; prevlen = curlen;
21467c478bd9Sstevel@tonic-gate if (nextlen == 0) {
21477c478bd9Sstevel@tonic-gate max_count = 138, min_count = 3;
21487c478bd9Sstevel@tonic-gate } else if (curlen == nextlen) {
21497c478bd9Sstevel@tonic-gate max_count = 6, min_count = 3;
21507c478bd9Sstevel@tonic-gate } else {
21517c478bd9Sstevel@tonic-gate max_count = 7, min_count = 4;
21527c478bd9Sstevel@tonic-gate }
21537c478bd9Sstevel@tonic-gate }
21547c478bd9Sstevel@tonic-gate }
21557c478bd9Sstevel@tonic-gate
21567c478bd9Sstevel@tonic-gate /* ===========================================================================
21577c478bd9Sstevel@tonic-gate * Construct the Huffman tree for the bit lengths and return the index in
21587c478bd9Sstevel@tonic-gate * bl_order of the last bit length code to send.
21597c478bd9Sstevel@tonic-gate */
build_bl_tree(s)21607c478bd9Sstevel@tonic-gate local int build_bl_tree(s)
21617c478bd9Sstevel@tonic-gate deflate_state *s;
21627c478bd9Sstevel@tonic-gate {
21637c478bd9Sstevel@tonic-gate int max_blindex; /* index of last bit length code of non zero freq */
21647c478bd9Sstevel@tonic-gate
21657c478bd9Sstevel@tonic-gate /* Determine the bit length frequencies for literal and distance trees */
21667c478bd9Sstevel@tonic-gate scan_tree(s, (ct_data *)s->dyn_ltree, s->l_desc.max_code);
21677c478bd9Sstevel@tonic-gate scan_tree(s, (ct_data *)s->dyn_dtree, s->d_desc.max_code);
21687c478bd9Sstevel@tonic-gate
21697c478bd9Sstevel@tonic-gate /* Build the bit length tree: */
21707c478bd9Sstevel@tonic-gate build_tree(s, (tree_desc *)(&(s->bl_desc)));
21717c478bd9Sstevel@tonic-gate /* opt_len now includes the length of the tree representations, except
21727c478bd9Sstevel@tonic-gate * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
21737c478bd9Sstevel@tonic-gate */
21747c478bd9Sstevel@tonic-gate
21757c478bd9Sstevel@tonic-gate /* Determine the number of bit length codes to send. The pkzip format
21767c478bd9Sstevel@tonic-gate * requires that at least 4 bit length codes be sent. (appnote.txt says
21777c478bd9Sstevel@tonic-gate * 3 but the actual value used is 4.)
21787c478bd9Sstevel@tonic-gate */
21797c478bd9Sstevel@tonic-gate for (max_blindex = BL_CODES-1; max_blindex >= 3; max_blindex--) {
21807c478bd9Sstevel@tonic-gate if (s->bl_tree[bl_order[max_blindex]].Len != 0) break;
21817c478bd9Sstevel@tonic-gate }
21827c478bd9Sstevel@tonic-gate /* Update opt_len to include the bit length tree and counts */
21837c478bd9Sstevel@tonic-gate s->opt_len += 3*(max_blindex+1) + 5+5+4;
21847c478bd9Sstevel@tonic-gate Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld",
21857c478bd9Sstevel@tonic-gate s->opt_len, s->static_len));
21867c478bd9Sstevel@tonic-gate
21877c478bd9Sstevel@tonic-gate return max_blindex;
21887c478bd9Sstevel@tonic-gate }
21897c478bd9Sstevel@tonic-gate
21907c478bd9Sstevel@tonic-gate /* ===========================================================================
21917c478bd9Sstevel@tonic-gate * Send the header for a block using dynamic Huffman trees: the counts, the
21927c478bd9Sstevel@tonic-gate * lengths of the bit length codes, the literal tree and the distance tree.
21937c478bd9Sstevel@tonic-gate * IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
21947c478bd9Sstevel@tonic-gate */
send_all_trees(s,lcodes,dcodes,blcodes)21957c478bd9Sstevel@tonic-gate local void send_all_trees(s, lcodes, dcodes, blcodes)
21967c478bd9Sstevel@tonic-gate deflate_state *s;
21977c478bd9Sstevel@tonic-gate int lcodes, dcodes, blcodes; /* number of codes for each tree */
21987c478bd9Sstevel@tonic-gate {
21997c478bd9Sstevel@tonic-gate int rank; /* index in bl_order */
22007c478bd9Sstevel@tonic-gate
22017c478bd9Sstevel@tonic-gate Assert (lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes");
22027c478bd9Sstevel@tonic-gate Assert (lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES,
22037c478bd9Sstevel@tonic-gate "too many codes");
22047c478bd9Sstevel@tonic-gate Tracev((stderr, "\nbl counts: "));
22057c478bd9Sstevel@tonic-gate send_bits(s, lcodes-257, 5); /* not +255 as stated in appnote.txt */
22067c478bd9Sstevel@tonic-gate send_bits(s, dcodes-1, 5);
22077c478bd9Sstevel@tonic-gate send_bits(s, blcodes-4, 4); /* not -3 as stated in appnote.txt */
22087c478bd9Sstevel@tonic-gate for (rank = 0; rank < blcodes; rank++) {
22097c478bd9Sstevel@tonic-gate Tracev((stderr, "\nbl code %2d ", bl_order[rank]));
22107c478bd9Sstevel@tonic-gate send_bits(s, s->bl_tree[bl_order[rank]].Len, 3);
22117c478bd9Sstevel@tonic-gate }
22127c478bd9Sstevel@tonic-gate Tracev((stderr, "\nbl tree: sent %ld", s->bits_sent));
22137c478bd9Sstevel@tonic-gate
22147c478bd9Sstevel@tonic-gate send_tree(s, (ct_data *)s->dyn_ltree, lcodes-1); /* literal tree */
22157c478bd9Sstevel@tonic-gate Tracev((stderr, "\nlit tree: sent %ld", s->bits_sent));
22167c478bd9Sstevel@tonic-gate
22177c478bd9Sstevel@tonic-gate send_tree(s, (ct_data *)s->dyn_dtree, dcodes-1); /* distance tree */
22187c478bd9Sstevel@tonic-gate Tracev((stderr, "\ndist tree: sent %ld", s->bits_sent));
22197c478bd9Sstevel@tonic-gate }
22207c478bd9Sstevel@tonic-gate
22217c478bd9Sstevel@tonic-gate /* ===========================================================================
22227c478bd9Sstevel@tonic-gate * Send a stored block
22237c478bd9Sstevel@tonic-gate */
ct_stored_block(s,buf,stored_len,eof)22247c478bd9Sstevel@tonic-gate local void ct_stored_block(s, buf, stored_len, eof)
22257c478bd9Sstevel@tonic-gate deflate_state *s;
22267c478bd9Sstevel@tonic-gate charf *buf; /* input block */
22277c478bd9Sstevel@tonic-gate ulg stored_len; /* length of input block */
22287c478bd9Sstevel@tonic-gate int eof; /* true if this is the last block for a file */
22297c478bd9Sstevel@tonic-gate {
22307c478bd9Sstevel@tonic-gate send_bits(s, (STORED_BLOCK<<1)+eof, 3); /* send block type */
22317c478bd9Sstevel@tonic-gate s->compressed_len = (s->compressed_len + 3 + 7) & ~7L;
22327c478bd9Sstevel@tonic-gate s->compressed_len += (stored_len + 4) << 3;
22337c478bd9Sstevel@tonic-gate
22347c478bd9Sstevel@tonic-gate copy_block(s, buf, (unsigned)stored_len, 1); /* with header */
22357c478bd9Sstevel@tonic-gate }
22367c478bd9Sstevel@tonic-gate
22377c478bd9Sstevel@tonic-gate /* Send just the `stored block' type code without any length bytes or data.
22387c478bd9Sstevel@tonic-gate */
ct_stored_type_only(s)22397c478bd9Sstevel@tonic-gate local void ct_stored_type_only(s)
22407c478bd9Sstevel@tonic-gate deflate_state *s;
22417c478bd9Sstevel@tonic-gate {
22427c478bd9Sstevel@tonic-gate send_bits(s, (STORED_BLOCK << 1), 3);
22437c478bd9Sstevel@tonic-gate bi_windup(s);
22447c478bd9Sstevel@tonic-gate s->compressed_len = (s->compressed_len + 3) & ~7L;
22457c478bd9Sstevel@tonic-gate }
22467c478bd9Sstevel@tonic-gate
22477c478bd9Sstevel@tonic-gate
22487c478bd9Sstevel@tonic-gate /* ===========================================================================
22497c478bd9Sstevel@tonic-gate * Send one empty static block to give enough lookahead for inflate.
22507c478bd9Sstevel@tonic-gate * This takes 10 bits, of which 7 may remain in the bit buffer.
22517c478bd9Sstevel@tonic-gate * The current inflate code requires 9 bits of lookahead. If the EOB
22527c478bd9Sstevel@tonic-gate * code for the previous block was coded on 5 bits or less, inflate
22537c478bd9Sstevel@tonic-gate * may have only 5+3 bits of lookahead to decode this EOB.
22547c478bd9Sstevel@tonic-gate * (There are no problems if the previous block is stored or fixed.)
22557c478bd9Sstevel@tonic-gate */
ct_align(s)22567c478bd9Sstevel@tonic-gate local void ct_align(s)
22577c478bd9Sstevel@tonic-gate deflate_state *s;
22587c478bd9Sstevel@tonic-gate {
22597c478bd9Sstevel@tonic-gate send_bits(s, STATIC_TREES<<1, 3);
22607c478bd9Sstevel@tonic-gate send_code(s, END_BLOCK, static_ltree);
22617c478bd9Sstevel@tonic-gate s->compressed_len += 10L; /* 3 for block type, 7 for EOB */
22627c478bd9Sstevel@tonic-gate bi_flush(s);
22637c478bd9Sstevel@tonic-gate /* Of the 10 bits for the empty block, we have already sent
22647c478bd9Sstevel@tonic-gate * (10 - bi_valid) bits. The lookahead for the EOB of the previous
22657c478bd9Sstevel@tonic-gate * block was thus its length plus what we have just sent.
22667c478bd9Sstevel@tonic-gate */
22677c478bd9Sstevel@tonic-gate if (s->last_eob_len + 10 - s->bi_valid < 9) {
22687c478bd9Sstevel@tonic-gate send_bits(s, STATIC_TREES<<1, 3);
22697c478bd9Sstevel@tonic-gate send_code(s, END_BLOCK, static_ltree);
22707c478bd9Sstevel@tonic-gate s->compressed_len += 10L;
22717c478bd9Sstevel@tonic-gate bi_flush(s);
22727c478bd9Sstevel@tonic-gate }
22737c478bd9Sstevel@tonic-gate s->last_eob_len = 7;
22747c478bd9Sstevel@tonic-gate }
22757c478bd9Sstevel@tonic-gate
22767c478bd9Sstevel@tonic-gate /* ===========================================================================
22777c478bd9Sstevel@tonic-gate * Determine the best encoding for the current block: dynamic trees, static
22787c478bd9Sstevel@tonic-gate * trees or store, and output the encoded block to the zip file. This function
22797c478bd9Sstevel@tonic-gate * returns the total compressed length for the file so far.
22807c478bd9Sstevel@tonic-gate */
ct_flush_block(s,buf,stored_len,flush)22817c478bd9Sstevel@tonic-gate local ulg ct_flush_block(s, buf, stored_len, flush)
22827c478bd9Sstevel@tonic-gate deflate_state *s;
22837c478bd9Sstevel@tonic-gate charf *buf; /* input block, or NULL if too old */
22847c478bd9Sstevel@tonic-gate ulg stored_len; /* length of input block */
22857c478bd9Sstevel@tonic-gate int flush; /* Z_FINISH if this is the last block for a file */
22867c478bd9Sstevel@tonic-gate {
22877c478bd9Sstevel@tonic-gate ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */
22887c478bd9Sstevel@tonic-gate int max_blindex; /* index of last bit length code of non zero freq */
22897c478bd9Sstevel@tonic-gate int eof = flush == Z_FINISH;
22907c478bd9Sstevel@tonic-gate
22917c478bd9Sstevel@tonic-gate ++s->blocks_in_packet;
22927c478bd9Sstevel@tonic-gate
22937c478bd9Sstevel@tonic-gate /* Check if the file is ascii or binary */
22947c478bd9Sstevel@tonic-gate if (s->data_type == UNKNOWN) set_data_type(s);
22957c478bd9Sstevel@tonic-gate
22967c478bd9Sstevel@tonic-gate /* Construct the literal and distance trees */
22977c478bd9Sstevel@tonic-gate build_tree(s, (tree_desc *)(&(s->l_desc)));
22987c478bd9Sstevel@tonic-gate Tracev((stderr, "\nlit data: dyn %ld, stat %ld", s->opt_len,
22997c478bd9Sstevel@tonic-gate s->static_len));
23007c478bd9Sstevel@tonic-gate
23017c478bd9Sstevel@tonic-gate build_tree(s, (tree_desc *)(&(s->d_desc)));
23027c478bd9Sstevel@tonic-gate Tracev((stderr, "\ndist data: dyn %ld, stat %ld", s->opt_len,
23037c478bd9Sstevel@tonic-gate s->static_len));
23047c478bd9Sstevel@tonic-gate /* At this point, opt_len and static_len are the total bit lengths of
23057c478bd9Sstevel@tonic-gate * the compressed block data, excluding the tree representations.
23067c478bd9Sstevel@tonic-gate */
23077c478bd9Sstevel@tonic-gate
23087c478bd9Sstevel@tonic-gate /* Build the bit length tree for the above two trees, and get the index
23097c478bd9Sstevel@tonic-gate * in bl_order of the last bit length code to send.
23107c478bd9Sstevel@tonic-gate */
23117c478bd9Sstevel@tonic-gate max_blindex = build_bl_tree(s);
23127c478bd9Sstevel@tonic-gate
23137c478bd9Sstevel@tonic-gate /* Determine the best encoding. Compute first the block length in bytes */
23147c478bd9Sstevel@tonic-gate opt_lenb = (s->opt_len+3+7)>>3;
23157c478bd9Sstevel@tonic-gate static_lenb = (s->static_len+3+7)>>3;
23167c478bd9Sstevel@tonic-gate
23177c478bd9Sstevel@tonic-gate Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ",
23187c478bd9Sstevel@tonic-gate opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,
23197c478bd9Sstevel@tonic-gate s->last_lit));
23207c478bd9Sstevel@tonic-gate
23217c478bd9Sstevel@tonic-gate if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
23227c478bd9Sstevel@tonic-gate
23237c478bd9Sstevel@tonic-gate /* If compression failed and this is the first and last block,
23247c478bd9Sstevel@tonic-gate * and if the .zip file can be seeked (to rewrite the local header),
23257c478bd9Sstevel@tonic-gate * the whole file is transformed into a stored file:
23267c478bd9Sstevel@tonic-gate */
23277c478bd9Sstevel@tonic-gate #ifdef STORED_FILE_OK
23287c478bd9Sstevel@tonic-gate # ifdef FORCE_STORED_FILE
23297c478bd9Sstevel@tonic-gate if (eof && compressed_len == 0L) /* force stored file */
23307c478bd9Sstevel@tonic-gate # else
23317c478bd9Sstevel@tonic-gate if (stored_len <= opt_lenb && eof && s->compressed_len==0L && seekable())
23327c478bd9Sstevel@tonic-gate # endif
23337c478bd9Sstevel@tonic-gate {
23347c478bd9Sstevel@tonic-gate /* Since LIT_BUFSIZE <= 2*WSIZE, the input data must be there: */
23357c478bd9Sstevel@tonic-gate if (buf == (charf*)0) error ("block vanished");
23367c478bd9Sstevel@tonic-gate
23377c478bd9Sstevel@tonic-gate copy_block(buf, (unsigned)stored_len, 0); /* without header */
23387c478bd9Sstevel@tonic-gate s->compressed_len = stored_len << 3;
23397c478bd9Sstevel@tonic-gate s->method = STORED;
23407c478bd9Sstevel@tonic-gate } else
23417c478bd9Sstevel@tonic-gate #endif /* STORED_FILE_OK */
23427c478bd9Sstevel@tonic-gate
23437c478bd9Sstevel@tonic-gate /* For Z_PACKET_FLUSH, if we don't achieve the required minimum
23447c478bd9Sstevel@tonic-gate * compression, and this block contains all the data since the last
23457c478bd9Sstevel@tonic-gate * time we used Z_PACKET_FLUSH, then just omit this block completely
23467c478bd9Sstevel@tonic-gate * from the output.
23477c478bd9Sstevel@tonic-gate */
23487c478bd9Sstevel@tonic-gate if (flush == Z_PACKET_FLUSH && s->blocks_in_packet == 1
23497c478bd9Sstevel@tonic-gate && opt_lenb > stored_len - s->minCompr) {
23507c478bd9Sstevel@tonic-gate s->blocks_in_packet = 0;
23517c478bd9Sstevel@tonic-gate /* output nothing */
23527c478bd9Sstevel@tonic-gate } else
23537c478bd9Sstevel@tonic-gate
23547c478bd9Sstevel@tonic-gate #ifdef FORCE_STORED
23557c478bd9Sstevel@tonic-gate if (buf != (char*)0) /* force stored block */
23567c478bd9Sstevel@tonic-gate #else
23577c478bd9Sstevel@tonic-gate if (stored_len+4 <= opt_lenb && buf != (char*)0)
23587c478bd9Sstevel@tonic-gate /* 4: two words for the lengths */
23597c478bd9Sstevel@tonic-gate #endif
23607c478bd9Sstevel@tonic-gate {
23617c478bd9Sstevel@tonic-gate /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
23627c478bd9Sstevel@tonic-gate * Otherwise we can't have processed more than WSIZE input bytes since
23637c478bd9Sstevel@tonic-gate * the last block flush, because compression would have been
23647c478bd9Sstevel@tonic-gate * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
23657c478bd9Sstevel@tonic-gate * transform a block into a stored block.
23667c478bd9Sstevel@tonic-gate */
23677c478bd9Sstevel@tonic-gate ct_stored_block(s, buf, stored_len, eof);
23687c478bd9Sstevel@tonic-gate } else
23697c478bd9Sstevel@tonic-gate
23707c478bd9Sstevel@tonic-gate #ifdef FORCE_STATIC
23717c478bd9Sstevel@tonic-gate if (static_lenb >= 0) /* force static trees */
23727c478bd9Sstevel@tonic-gate #else
23737c478bd9Sstevel@tonic-gate if (static_lenb == opt_lenb)
23747c478bd9Sstevel@tonic-gate #endif
23757c478bd9Sstevel@tonic-gate {
23767c478bd9Sstevel@tonic-gate send_bits(s, (STATIC_TREES<<1)+eof, 3);
23777c478bd9Sstevel@tonic-gate compress_block(s, (ct_data *)static_ltree, (ct_data *)static_dtree);
23787c478bd9Sstevel@tonic-gate s->compressed_len += 3 + s->static_len;
23797c478bd9Sstevel@tonic-gate } else {
23807c478bd9Sstevel@tonic-gate send_bits(s, (DYN_TREES<<1)+eof, 3);
23817c478bd9Sstevel@tonic-gate send_all_trees(s, s->l_desc.max_code+1, s->d_desc.max_code+1,
23827c478bd9Sstevel@tonic-gate max_blindex+1);
23837c478bd9Sstevel@tonic-gate compress_block(s, (ct_data *)s->dyn_ltree, (ct_data *)s->dyn_dtree);
23847c478bd9Sstevel@tonic-gate s->compressed_len += 3 + s->opt_len;
23857c478bd9Sstevel@tonic-gate }
23867c478bd9Sstevel@tonic-gate Assert (s->compressed_len == s->bits_sent, "bad compressed size");
23877c478bd9Sstevel@tonic-gate init_block(s);
23887c478bd9Sstevel@tonic-gate
23897c478bd9Sstevel@tonic-gate if (eof) {
23907c478bd9Sstevel@tonic-gate bi_windup(s);
23917c478bd9Sstevel@tonic-gate s->compressed_len += 7; /* align on byte boundary */
23927c478bd9Sstevel@tonic-gate }
23937c478bd9Sstevel@tonic-gate Tracev((stderr,"\ncomprlen %lu(%lu) ", s->compressed_len>>3,
23947c478bd9Sstevel@tonic-gate s->compressed_len-7*eof));
23957c478bd9Sstevel@tonic-gate
23967c478bd9Sstevel@tonic-gate return s->compressed_len >> 3;
23977c478bd9Sstevel@tonic-gate }
23987c478bd9Sstevel@tonic-gate
23997c478bd9Sstevel@tonic-gate /* ===========================================================================
24007c478bd9Sstevel@tonic-gate * Save the match info and tally the frequency counts. Return true if
24017c478bd9Sstevel@tonic-gate * the current block must be flushed.
24027c478bd9Sstevel@tonic-gate */
ct_tally(s,dist,lc)24037c478bd9Sstevel@tonic-gate local int ct_tally (s, dist, lc)
24047c478bd9Sstevel@tonic-gate deflate_state *s;
24057c478bd9Sstevel@tonic-gate int dist; /* distance of matched string */
24067c478bd9Sstevel@tonic-gate int lc; /* match length-MIN_MATCH or unmatched char (if dist==0) */
24077c478bd9Sstevel@tonic-gate {
24087c478bd9Sstevel@tonic-gate s->d_buf[s->last_lit] = (ush)dist;
24097c478bd9Sstevel@tonic-gate s->l_buf[s->last_lit++] = (uch)lc;
24107c478bd9Sstevel@tonic-gate if (dist == 0) {
24117c478bd9Sstevel@tonic-gate /* lc is the unmatched char */
24127c478bd9Sstevel@tonic-gate s->dyn_ltree[lc].Freq++;
24137c478bd9Sstevel@tonic-gate } else {
24147c478bd9Sstevel@tonic-gate s->matches++;
24157c478bd9Sstevel@tonic-gate /* Here, lc is the match length - MIN_MATCH */
24167c478bd9Sstevel@tonic-gate dist--; /* dist = match distance - 1 */
24177c478bd9Sstevel@tonic-gate Assert((ush)dist < (ush)MAX_DIST(s) &&
24187c478bd9Sstevel@tonic-gate (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
24197c478bd9Sstevel@tonic-gate (ush)d_code(dist) < (ush)D_CODES, "ct_tally: bad match");
24207c478bd9Sstevel@tonic-gate
24217c478bd9Sstevel@tonic-gate s->dyn_ltree[length_code[lc]+LITERALS+1].Freq++;
24227c478bd9Sstevel@tonic-gate s->dyn_dtree[d_code(dist)].Freq++;
24237c478bd9Sstevel@tonic-gate }
24247c478bd9Sstevel@tonic-gate
24257c478bd9Sstevel@tonic-gate /* Try to guess if it is profitable to stop the current block here */
24267c478bd9Sstevel@tonic-gate if (s->level > 2 && (s->last_lit & 0xfff) == 0) {
24277c478bd9Sstevel@tonic-gate /* Compute an upper bound for the compressed length */
24287c478bd9Sstevel@tonic-gate ulg out_length = (ulg)s->last_lit*8L;
24297c478bd9Sstevel@tonic-gate ulg in_length = (ulg)s->strstart - s->block_start;
24307c478bd9Sstevel@tonic-gate int dcode;
24317c478bd9Sstevel@tonic-gate for (dcode = 0; dcode < D_CODES; dcode++) {
24327c478bd9Sstevel@tonic-gate out_length += (ulg)s->dyn_dtree[dcode].Freq *
24337c478bd9Sstevel@tonic-gate (5L+extra_dbits[dcode]);
24347c478bd9Sstevel@tonic-gate }
24357c478bd9Sstevel@tonic-gate out_length >>= 3;
24367c478bd9Sstevel@tonic-gate Tracev((stderr,"\nlast_lit %u, in %ld, out ~%ld(%ld%%) ",
24377c478bd9Sstevel@tonic-gate s->last_lit, in_length, out_length,
24387c478bd9Sstevel@tonic-gate 100L - out_length*100L/in_length));
24397c478bd9Sstevel@tonic-gate if (s->matches < s->last_lit/2 && out_length < in_length/2) return 1;
24407c478bd9Sstevel@tonic-gate }
24417c478bd9Sstevel@tonic-gate return (s->last_lit == s->lit_bufsize-1);
24427c478bd9Sstevel@tonic-gate /* We avoid equality with lit_bufsize because of wraparound at 64K
24437c478bd9Sstevel@tonic-gate * on 16 bit machines and because stored blocks are restricted to
24447c478bd9Sstevel@tonic-gate * 64K-1 bytes.
24457c478bd9Sstevel@tonic-gate */
24467c478bd9Sstevel@tonic-gate }
24477c478bd9Sstevel@tonic-gate
24487c478bd9Sstevel@tonic-gate /* ===========================================================================
24497c478bd9Sstevel@tonic-gate * Send the block data compressed using the given Huffman trees
24507c478bd9Sstevel@tonic-gate */
compress_block(s,ltree,dtree)24517c478bd9Sstevel@tonic-gate local void compress_block(s, ltree, dtree)
24527c478bd9Sstevel@tonic-gate deflate_state *s;
24537c478bd9Sstevel@tonic-gate ct_data *ltree; /* literal tree */
24547c478bd9Sstevel@tonic-gate ct_data *dtree; /* distance tree */
24557c478bd9Sstevel@tonic-gate {
24567c478bd9Sstevel@tonic-gate unsigned dist; /* distance of matched string */
24577c478bd9Sstevel@tonic-gate int lc; /* match length or unmatched char (if dist == 0) */
24587c478bd9Sstevel@tonic-gate unsigned lx = 0; /* running index in l_buf */
24597c478bd9Sstevel@tonic-gate unsigned code; /* the code to send */
24607c478bd9Sstevel@tonic-gate int extra; /* number of extra bits to send */
24617c478bd9Sstevel@tonic-gate
24627c478bd9Sstevel@tonic-gate if (s->last_lit != 0) do {
24637c478bd9Sstevel@tonic-gate dist = s->d_buf[lx];
24647c478bd9Sstevel@tonic-gate lc = s->l_buf[lx++];
24657c478bd9Sstevel@tonic-gate if (dist == 0) {
24667c478bd9Sstevel@tonic-gate send_code(s, lc, ltree); /* send a literal byte */
24677c478bd9Sstevel@tonic-gate Tracecv(isgraph(lc), (stderr," '%c' ", lc));
24687c478bd9Sstevel@tonic-gate } else {
24697c478bd9Sstevel@tonic-gate /* Here, lc is the match length - MIN_MATCH */
24707c478bd9Sstevel@tonic-gate code = length_code[lc];
24717c478bd9Sstevel@tonic-gate send_code(s, code+LITERALS+1, ltree); /* send the length code */
24727c478bd9Sstevel@tonic-gate extra = extra_lbits[code];
24737c478bd9Sstevel@tonic-gate if (extra != 0) {
24747c478bd9Sstevel@tonic-gate lc -= base_length[code];
24757c478bd9Sstevel@tonic-gate send_bits(s, lc, extra); /* send the extra length bits */
24767c478bd9Sstevel@tonic-gate }
24777c478bd9Sstevel@tonic-gate dist--; /* dist is now the match distance - 1 */
24787c478bd9Sstevel@tonic-gate code = d_code(dist);
24797c478bd9Sstevel@tonic-gate Assert (code < D_CODES, "bad d_code");
24807c478bd9Sstevel@tonic-gate
24817c478bd9Sstevel@tonic-gate send_code(s, code, dtree); /* send the distance code */
24827c478bd9Sstevel@tonic-gate extra = extra_dbits[code];
24837c478bd9Sstevel@tonic-gate if (extra != 0) {
24847c478bd9Sstevel@tonic-gate dist -= base_dist[code];
24857c478bd9Sstevel@tonic-gate send_bits(s, dist, extra); /* send the extra distance bits */
24867c478bd9Sstevel@tonic-gate }
24877c478bd9Sstevel@tonic-gate } /* literal or match pair ? */
24887c478bd9Sstevel@tonic-gate
24897c478bd9Sstevel@tonic-gate /* Check that the overlay between pending_buf and d_buf+l_buf is ok: */
24907c478bd9Sstevel@tonic-gate Assert(s->pending < s->lit_bufsize + 2*lx, "pendingBuf overflow");
24917c478bd9Sstevel@tonic-gate
24927c478bd9Sstevel@tonic-gate } while (lx < s->last_lit);
24937c478bd9Sstevel@tonic-gate
24947c478bd9Sstevel@tonic-gate send_code(s, END_BLOCK, ltree);
24957c478bd9Sstevel@tonic-gate s->last_eob_len = ltree[END_BLOCK].Len;
24967c478bd9Sstevel@tonic-gate }
24977c478bd9Sstevel@tonic-gate
24987c478bd9Sstevel@tonic-gate /* ===========================================================================
24997c478bd9Sstevel@tonic-gate * Set the data type to ASCII or BINARY, using a crude approximation:
25007c478bd9Sstevel@tonic-gate * binary if more than 20% of the bytes are <= 6 or >= 128, ascii otherwise.
25017c478bd9Sstevel@tonic-gate * IN assertion: the fields freq of dyn_ltree are set and the total of all
25027c478bd9Sstevel@tonic-gate * frequencies does not exceed 64K (to fit in an int on 16 bit machines).
25037c478bd9Sstevel@tonic-gate */
set_data_type(s)25047c478bd9Sstevel@tonic-gate local void set_data_type(s)
25057c478bd9Sstevel@tonic-gate deflate_state *s;
25067c478bd9Sstevel@tonic-gate {
25077c478bd9Sstevel@tonic-gate int n = 0;
25087c478bd9Sstevel@tonic-gate unsigned ascii_freq = 0;
25097c478bd9Sstevel@tonic-gate unsigned bin_freq = 0;
25107c478bd9Sstevel@tonic-gate while (n < 7) bin_freq += s->dyn_ltree[n++].Freq;
25117c478bd9Sstevel@tonic-gate while (n < 128) ascii_freq += s->dyn_ltree[n++].Freq;
25127c478bd9Sstevel@tonic-gate while (n < LITERALS) bin_freq += s->dyn_ltree[n++].Freq;
25137c478bd9Sstevel@tonic-gate s->data_type = (Byte)(bin_freq > (ascii_freq >> 2) ? BINARY : ASCII);
25147c478bd9Sstevel@tonic-gate }
25157c478bd9Sstevel@tonic-gate
25167c478bd9Sstevel@tonic-gate /* ===========================================================================
25177c478bd9Sstevel@tonic-gate * Reverse the first len bits of a code, using straightforward code (a faster
25187c478bd9Sstevel@tonic-gate * method would use a table)
25197c478bd9Sstevel@tonic-gate * IN assertion: 1 <= len <= 15
25207c478bd9Sstevel@tonic-gate */
bi_reverse(code,len)25217c478bd9Sstevel@tonic-gate local unsigned bi_reverse(code, len)
25227c478bd9Sstevel@tonic-gate unsigned code; /* the value to invert */
25237c478bd9Sstevel@tonic-gate int len; /* its bit length */
25247c478bd9Sstevel@tonic-gate {
25257c478bd9Sstevel@tonic-gate register unsigned res = 0;
25267c478bd9Sstevel@tonic-gate do {
25277c478bd9Sstevel@tonic-gate res |= code & 1;
25287c478bd9Sstevel@tonic-gate code >>= 1, res <<= 1;
25297c478bd9Sstevel@tonic-gate } while (--len > 0);
25307c478bd9Sstevel@tonic-gate return res >> 1;
25317c478bd9Sstevel@tonic-gate }
25327c478bd9Sstevel@tonic-gate
25337c478bd9Sstevel@tonic-gate /* ===========================================================================
25347c478bd9Sstevel@tonic-gate * Flush the bit buffer, keeping at most 7 bits in it.
25357c478bd9Sstevel@tonic-gate */
bi_flush(s)25367c478bd9Sstevel@tonic-gate local void bi_flush(s)
25377c478bd9Sstevel@tonic-gate deflate_state *s;
25387c478bd9Sstevel@tonic-gate {
25397c478bd9Sstevel@tonic-gate if (s->bi_valid == 16) {
25407c478bd9Sstevel@tonic-gate put_short(s, s->bi_buf);
25417c478bd9Sstevel@tonic-gate s->bi_buf = 0;
25427c478bd9Sstevel@tonic-gate s->bi_valid = 0;
25437c478bd9Sstevel@tonic-gate } else if (s->bi_valid >= 8) {
25447c478bd9Sstevel@tonic-gate put_byte(s, (Byte)s->bi_buf);
25457c478bd9Sstevel@tonic-gate s->bi_buf >>= 8;
25467c478bd9Sstevel@tonic-gate s->bi_valid -= 8;
25477c478bd9Sstevel@tonic-gate }
25487c478bd9Sstevel@tonic-gate }
25497c478bd9Sstevel@tonic-gate
25507c478bd9Sstevel@tonic-gate /* ===========================================================================
25517c478bd9Sstevel@tonic-gate * Flush the bit buffer and align the output on a byte boundary
25527c478bd9Sstevel@tonic-gate */
bi_windup(s)25537c478bd9Sstevel@tonic-gate local void bi_windup(s)
25547c478bd9Sstevel@tonic-gate deflate_state *s;
25557c478bd9Sstevel@tonic-gate {
25567c478bd9Sstevel@tonic-gate if (s->bi_valid > 8) {
25577c478bd9Sstevel@tonic-gate put_short(s, s->bi_buf);
25587c478bd9Sstevel@tonic-gate } else if (s->bi_valid > 0) {
25597c478bd9Sstevel@tonic-gate put_byte(s, (Byte)s->bi_buf);
25607c478bd9Sstevel@tonic-gate }
25617c478bd9Sstevel@tonic-gate s->bi_buf = 0;
25627c478bd9Sstevel@tonic-gate s->bi_valid = 0;
25637c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
25647c478bd9Sstevel@tonic-gate s->bits_sent = (s->bits_sent+7) & ~7;
25657c478bd9Sstevel@tonic-gate #endif
25667c478bd9Sstevel@tonic-gate }
25677c478bd9Sstevel@tonic-gate
25687c478bd9Sstevel@tonic-gate /* ===========================================================================
25697c478bd9Sstevel@tonic-gate * Copy a stored block, storing first the length and its
25707c478bd9Sstevel@tonic-gate * one's complement if requested.
25717c478bd9Sstevel@tonic-gate */
copy_block(s,buf,len,header)25727c478bd9Sstevel@tonic-gate local void copy_block(s, buf, len, header)
25737c478bd9Sstevel@tonic-gate deflate_state *s;
25747c478bd9Sstevel@tonic-gate charf *buf; /* the input data */
25757c478bd9Sstevel@tonic-gate unsigned len; /* its length */
25767c478bd9Sstevel@tonic-gate int header; /* true if block header must be written */
25777c478bd9Sstevel@tonic-gate {
25787c478bd9Sstevel@tonic-gate bi_windup(s); /* align on byte boundary */
25797c478bd9Sstevel@tonic-gate s->last_eob_len = 8; /* enough lookahead for inflate */
25807c478bd9Sstevel@tonic-gate
25817c478bd9Sstevel@tonic-gate if (header) {
2582*55fea89dSDan Cross put_short(s, (ush)len);
25837c478bd9Sstevel@tonic-gate put_short(s, (ush)~len);
25847c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
25857c478bd9Sstevel@tonic-gate s->bits_sent += 2*16;
25867c478bd9Sstevel@tonic-gate #endif
25877c478bd9Sstevel@tonic-gate }
25887c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
25897c478bd9Sstevel@tonic-gate s->bits_sent += (ulg)len<<3;
25907c478bd9Sstevel@tonic-gate #endif
25917c478bd9Sstevel@tonic-gate while (len--) {
25927c478bd9Sstevel@tonic-gate put_byte(s, *buf++);
25937c478bd9Sstevel@tonic-gate }
25947c478bd9Sstevel@tonic-gate }
25957c478bd9Sstevel@tonic-gate
25967c478bd9Sstevel@tonic-gate
25977c478bd9Sstevel@tonic-gate /*+++++*/
25987c478bd9Sstevel@tonic-gate /* infblock.h -- header to use infblock.c
25997c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
2600*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
26017c478bd9Sstevel@tonic-gate */
26027c478bd9Sstevel@tonic-gate
26037c478bd9Sstevel@tonic-gate /* WARNING: this file should *not* be used by applications. It is
26047c478bd9Sstevel@tonic-gate part of the implementation of the compression library and is
26057c478bd9Sstevel@tonic-gate subject to change. Applications should only use zlib.h.
26067c478bd9Sstevel@tonic-gate */
26077c478bd9Sstevel@tonic-gate
26087c478bd9Sstevel@tonic-gate struct inflate_blocks_state;
26097c478bd9Sstevel@tonic-gate typedef struct inflate_blocks_state FAR inflate_blocks_statef;
26107c478bd9Sstevel@tonic-gate
26117c478bd9Sstevel@tonic-gate local inflate_blocks_statef * inflate_blocks_new OF((
26127c478bd9Sstevel@tonic-gate z_stream *z,
26137c478bd9Sstevel@tonic-gate check_func c, /* check function */
26147c478bd9Sstevel@tonic-gate uInt w)); /* window size */
26157c478bd9Sstevel@tonic-gate
26167c478bd9Sstevel@tonic-gate local int inflate_blocks OF((
26177c478bd9Sstevel@tonic-gate inflate_blocks_statef *,
26187c478bd9Sstevel@tonic-gate z_stream *,
26197c478bd9Sstevel@tonic-gate int)); /* initial return code */
26207c478bd9Sstevel@tonic-gate
26217c478bd9Sstevel@tonic-gate local void inflate_blocks_reset OF((
26227c478bd9Sstevel@tonic-gate inflate_blocks_statef *,
26237c478bd9Sstevel@tonic-gate z_stream *,
26247c478bd9Sstevel@tonic-gate uLongf *)); /* check value on output */
26257c478bd9Sstevel@tonic-gate
26267c478bd9Sstevel@tonic-gate local int inflate_blocks_free OF((
26277c478bd9Sstevel@tonic-gate inflate_blocks_statef *,
26287c478bd9Sstevel@tonic-gate z_stream *,
26297c478bd9Sstevel@tonic-gate uLongf *)); /* check value on output */
26307c478bd9Sstevel@tonic-gate
26317c478bd9Sstevel@tonic-gate local int inflate_addhistory OF((
26327c478bd9Sstevel@tonic-gate inflate_blocks_statef *,
26337c478bd9Sstevel@tonic-gate z_stream *));
26347c478bd9Sstevel@tonic-gate
26357c478bd9Sstevel@tonic-gate local int inflate_packet_flush OF((
26367c478bd9Sstevel@tonic-gate inflate_blocks_statef *));
26377c478bd9Sstevel@tonic-gate
26387c478bd9Sstevel@tonic-gate /*+++++*/
26397c478bd9Sstevel@tonic-gate /* inftrees.h -- header to use inftrees.c
26407c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
2641*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
26427c478bd9Sstevel@tonic-gate */
26437c478bd9Sstevel@tonic-gate
26447c478bd9Sstevel@tonic-gate /* WARNING: this file should *not* be used by applications. It is
26457c478bd9Sstevel@tonic-gate part of the implementation of the compression library and is
26467c478bd9Sstevel@tonic-gate subject to change. Applications should only use zlib.h.
26477c478bd9Sstevel@tonic-gate */
26487c478bd9Sstevel@tonic-gate
26497c478bd9Sstevel@tonic-gate /* Huffman code lookup table entry--this entry is four bytes for machines
26507c478bd9Sstevel@tonic-gate that have 16-bit pointers (e.g. PC's in the small or medium model). */
26517c478bd9Sstevel@tonic-gate
26527c478bd9Sstevel@tonic-gate typedef struct inflate_huft_s FAR inflate_huft;
26537c478bd9Sstevel@tonic-gate
26547c478bd9Sstevel@tonic-gate struct inflate_huft_s {
26557c478bd9Sstevel@tonic-gate union {
26567c478bd9Sstevel@tonic-gate struct {
26577c478bd9Sstevel@tonic-gate Byte Exop; /* number of extra bits or operation */
26587c478bd9Sstevel@tonic-gate Byte Bits; /* number of bits in this code or subcode */
26597c478bd9Sstevel@tonic-gate } what;
26607c478bd9Sstevel@tonic-gate uInt Nalloc; /* number of these allocated here */
26617c478bd9Sstevel@tonic-gate Bytef *pad; /* pad structure to a power of 2 (4 bytes for */
26627c478bd9Sstevel@tonic-gate } word; /* 16-bit, 8 bytes for 32-bit machines) */
26637c478bd9Sstevel@tonic-gate union {
26647c478bd9Sstevel@tonic-gate uInt Base; /* literal, length base, or distance base */
26657c478bd9Sstevel@tonic-gate inflate_huft *Next; /* pointer to next level of table */
26667c478bd9Sstevel@tonic-gate } more;
26677c478bd9Sstevel@tonic-gate };
26687c478bd9Sstevel@tonic-gate
26697c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
26707c478bd9Sstevel@tonic-gate local uInt inflate_hufts;
26717c478bd9Sstevel@tonic-gate #endif
26727c478bd9Sstevel@tonic-gate
26737c478bd9Sstevel@tonic-gate local int inflate_trees_bits OF((
26747c478bd9Sstevel@tonic-gate uIntf *, /* 19 code lengths */
26757c478bd9Sstevel@tonic-gate uIntf *, /* bits tree desired/actual depth */
26767c478bd9Sstevel@tonic-gate inflate_huft * FAR *, /* bits tree result */
26777c478bd9Sstevel@tonic-gate z_stream *)); /* for zalloc, zfree functions */
26787c478bd9Sstevel@tonic-gate
26797c478bd9Sstevel@tonic-gate local int inflate_trees_dynamic OF((
26807c478bd9Sstevel@tonic-gate uInt, /* number of literal/length codes */
26817c478bd9Sstevel@tonic-gate uInt, /* number of distance codes */
26827c478bd9Sstevel@tonic-gate uIntf *, /* that many (total) code lengths */
26837c478bd9Sstevel@tonic-gate uIntf *, /* literal desired/actual bit depth */
26847c478bd9Sstevel@tonic-gate uIntf *, /* distance desired/actual bit depth */
26857c478bd9Sstevel@tonic-gate inflate_huft * FAR *, /* literal/length tree result */
26867c478bd9Sstevel@tonic-gate inflate_huft * FAR *, /* distance tree result */
26877c478bd9Sstevel@tonic-gate z_stream *)); /* for zalloc, zfree functions */
26887c478bd9Sstevel@tonic-gate
26897c478bd9Sstevel@tonic-gate local int inflate_trees_fixed OF((
26907c478bd9Sstevel@tonic-gate uIntf *, /* literal desired/actual bit depth */
26917c478bd9Sstevel@tonic-gate uIntf *, /* distance desired/actual bit depth */
26927c478bd9Sstevel@tonic-gate inflate_huft * FAR *, /* literal/length tree result */
26937c478bd9Sstevel@tonic-gate inflate_huft * FAR *)); /* distance tree result */
26947c478bd9Sstevel@tonic-gate
26957c478bd9Sstevel@tonic-gate local int inflate_trees_free OF((
26967c478bd9Sstevel@tonic-gate inflate_huft *, /* tables to free */
26977c478bd9Sstevel@tonic-gate z_stream *)); /* for zfree function */
26987c478bd9Sstevel@tonic-gate
26997c478bd9Sstevel@tonic-gate
27007c478bd9Sstevel@tonic-gate /*+++++*/
27017c478bd9Sstevel@tonic-gate /* infcodes.h -- header to use infcodes.c
27027c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
2703*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
27047c478bd9Sstevel@tonic-gate */
27057c478bd9Sstevel@tonic-gate
27067c478bd9Sstevel@tonic-gate /* WARNING: this file should *not* be used by applications. It is
27077c478bd9Sstevel@tonic-gate part of the implementation of the compression library and is
27087c478bd9Sstevel@tonic-gate subject to change. Applications should only use zlib.h.
27097c478bd9Sstevel@tonic-gate */
27107c478bd9Sstevel@tonic-gate
27117c478bd9Sstevel@tonic-gate struct inflate_codes_state;
27127c478bd9Sstevel@tonic-gate typedef struct inflate_codes_state FAR inflate_codes_statef;
27137c478bd9Sstevel@tonic-gate
27147c478bd9Sstevel@tonic-gate local inflate_codes_statef *inflate_codes_new OF((
27157c478bd9Sstevel@tonic-gate uInt, uInt,
27167c478bd9Sstevel@tonic-gate inflate_huft *, inflate_huft *,
27177c478bd9Sstevel@tonic-gate z_stream *));
27187c478bd9Sstevel@tonic-gate
27197c478bd9Sstevel@tonic-gate local int inflate_codes OF((
27207c478bd9Sstevel@tonic-gate inflate_blocks_statef *,
27217c478bd9Sstevel@tonic-gate z_stream *,
27227c478bd9Sstevel@tonic-gate int));
27237c478bd9Sstevel@tonic-gate
27247c478bd9Sstevel@tonic-gate local void inflate_codes_free OF((
27257c478bd9Sstevel@tonic-gate inflate_codes_statef *,
27267c478bd9Sstevel@tonic-gate z_stream *));
27277c478bd9Sstevel@tonic-gate
27287c478bd9Sstevel@tonic-gate
27297c478bd9Sstevel@tonic-gate /*+++++*/
27307c478bd9Sstevel@tonic-gate /* inflate.c -- zlib interface to inflate modules
27317c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
2732*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
27337c478bd9Sstevel@tonic-gate */
27347c478bd9Sstevel@tonic-gate
27357c478bd9Sstevel@tonic-gate /* inflate private state */
27367c478bd9Sstevel@tonic-gate struct internal_state {
27377c478bd9Sstevel@tonic-gate
27387c478bd9Sstevel@tonic-gate /* mode */
27397c478bd9Sstevel@tonic-gate enum {
27407c478bd9Sstevel@tonic-gate METHOD, /* waiting for method byte */
27417c478bd9Sstevel@tonic-gate FLAG, /* waiting for flag byte */
27427c478bd9Sstevel@tonic-gate BLOCKS, /* decompressing blocks */
27437c478bd9Sstevel@tonic-gate CHECK4, /* four check bytes to go */
27447c478bd9Sstevel@tonic-gate CHECK3, /* three check bytes to go */
27457c478bd9Sstevel@tonic-gate CHECK2, /* two check bytes to go */
27467c478bd9Sstevel@tonic-gate CHECK1, /* one check byte to go */
27477c478bd9Sstevel@tonic-gate DONE, /* finished check, done */
27487c478bd9Sstevel@tonic-gate BAD} /* got an error--stay here */
27497c478bd9Sstevel@tonic-gate mode; /* current inflate mode */
27507c478bd9Sstevel@tonic-gate
27517c478bd9Sstevel@tonic-gate /* mode dependent information */
27527c478bd9Sstevel@tonic-gate union {
27537c478bd9Sstevel@tonic-gate uInt method; /* if FLAGS, method byte */
27547c478bd9Sstevel@tonic-gate struct {
27557c478bd9Sstevel@tonic-gate uLong was; /* computed check value */
27567c478bd9Sstevel@tonic-gate uLong need; /* stream check value */
27577c478bd9Sstevel@tonic-gate } check; /* if CHECK, check values to compare */
27587c478bd9Sstevel@tonic-gate uInt marker; /* if BAD, inflateSync's marker bytes count */
27597c478bd9Sstevel@tonic-gate } sub; /* submode */
27607c478bd9Sstevel@tonic-gate
27617c478bd9Sstevel@tonic-gate /* mode independent information */
27627c478bd9Sstevel@tonic-gate int nowrap; /* flag for no wrapper */
27637c478bd9Sstevel@tonic-gate uInt wbits; /* log2(window size) (8..15, defaults to 15) */
2764*55fea89dSDan Cross inflate_blocks_statef
27657c478bd9Sstevel@tonic-gate *blocks; /* current inflate_blocks state */
27667c478bd9Sstevel@tonic-gate
27677c478bd9Sstevel@tonic-gate };
27687c478bd9Sstevel@tonic-gate
27697c478bd9Sstevel@tonic-gate
inflateReset(z)27707c478bd9Sstevel@tonic-gate int inflateReset(z)
27717c478bd9Sstevel@tonic-gate z_stream *z;
27727c478bd9Sstevel@tonic-gate {
27737c478bd9Sstevel@tonic-gate uLong c;
27747c478bd9Sstevel@tonic-gate
27757c478bd9Sstevel@tonic-gate if (z == Z_NULL || z->state == Z_NULL)
27767c478bd9Sstevel@tonic-gate return Z_STREAM_ERROR;
27777c478bd9Sstevel@tonic-gate z->total_in = z->total_out = 0;
27787c478bd9Sstevel@tonic-gate z->msg = Z_NULL;
27797c478bd9Sstevel@tonic-gate z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
27807c478bd9Sstevel@tonic-gate inflate_blocks_reset(z->state->blocks, z, &c);
27817c478bd9Sstevel@tonic-gate Trace((stderr, "inflate: reset\n"));
27827c478bd9Sstevel@tonic-gate return Z_OK;
27837c478bd9Sstevel@tonic-gate }
27847c478bd9Sstevel@tonic-gate
27857c478bd9Sstevel@tonic-gate
inflateEnd(z)27867c478bd9Sstevel@tonic-gate int inflateEnd(z)
27877c478bd9Sstevel@tonic-gate z_stream *z;
27887c478bd9Sstevel@tonic-gate {
27897c478bd9Sstevel@tonic-gate uLong c;
27907c478bd9Sstevel@tonic-gate
27917c478bd9Sstevel@tonic-gate if (z == Z_NULL || z->state == Z_NULL || z->zfree == Z_NULL)
27927c478bd9Sstevel@tonic-gate return Z_STREAM_ERROR;
27937c478bd9Sstevel@tonic-gate if (z->state->blocks != Z_NULL)
27947c478bd9Sstevel@tonic-gate inflate_blocks_free(z->state->blocks, z, &c);
27957c478bd9Sstevel@tonic-gate ZFREE(z, z->state, sizeof(struct internal_state));
27967c478bd9Sstevel@tonic-gate z->state = Z_NULL;
27977c478bd9Sstevel@tonic-gate Trace((stderr, "inflate: end\n"));
27987c478bd9Sstevel@tonic-gate return Z_OK;
27997c478bd9Sstevel@tonic-gate }
28007c478bd9Sstevel@tonic-gate
28017c478bd9Sstevel@tonic-gate
inflateInit2(z,w)28027c478bd9Sstevel@tonic-gate int inflateInit2(z, w)
28037c478bd9Sstevel@tonic-gate z_stream *z;
28047c478bd9Sstevel@tonic-gate int w;
28057c478bd9Sstevel@tonic-gate {
28067c478bd9Sstevel@tonic-gate /* initialize state */
28077c478bd9Sstevel@tonic-gate if (z == Z_NULL)
28087c478bd9Sstevel@tonic-gate return Z_STREAM_ERROR;
28097c478bd9Sstevel@tonic-gate /* if (z->zalloc == Z_NULL) z->zalloc = zcalloc; */
28107c478bd9Sstevel@tonic-gate /* if (z->zfree == Z_NULL) z->zfree = zcfree; */
28117c478bd9Sstevel@tonic-gate if ((z->state = (struct internal_state FAR *)
28127c478bd9Sstevel@tonic-gate ZALLOC(z,1,sizeof(struct internal_state))) == Z_NULL)
28137c478bd9Sstevel@tonic-gate return Z_MEM_ERROR;
28147c478bd9Sstevel@tonic-gate z->state->blocks = Z_NULL;
28157c478bd9Sstevel@tonic-gate
28167c478bd9Sstevel@tonic-gate /* handle undocumented nowrap option (no zlib header or check) */
28177c478bd9Sstevel@tonic-gate z->state->nowrap = 0;
28187c478bd9Sstevel@tonic-gate if (w < 0)
28197c478bd9Sstevel@tonic-gate {
28207c478bd9Sstevel@tonic-gate w = - w;
28217c478bd9Sstevel@tonic-gate z->state->nowrap = 1;
28227c478bd9Sstevel@tonic-gate }
28237c478bd9Sstevel@tonic-gate
28247c478bd9Sstevel@tonic-gate /* set window size */
28257c478bd9Sstevel@tonic-gate if (w < 8 || w > 15)
28267c478bd9Sstevel@tonic-gate {
28277c478bd9Sstevel@tonic-gate inflateEnd(z);
28287c478bd9Sstevel@tonic-gate return Z_STREAM_ERROR;
28297c478bd9Sstevel@tonic-gate }
28307c478bd9Sstevel@tonic-gate z->state->wbits = (uInt)w;
28317c478bd9Sstevel@tonic-gate
28327c478bd9Sstevel@tonic-gate /* create inflate_blocks state */
28337c478bd9Sstevel@tonic-gate if ((z->state->blocks =
28347c478bd9Sstevel@tonic-gate inflate_blocks_new(z, z->state->nowrap ? Z_NULL : adler32, 1 << w))
28357c478bd9Sstevel@tonic-gate == Z_NULL)
28367c478bd9Sstevel@tonic-gate {
28377c478bd9Sstevel@tonic-gate inflateEnd(z);
28387c478bd9Sstevel@tonic-gate return Z_MEM_ERROR;
28397c478bd9Sstevel@tonic-gate }
28407c478bd9Sstevel@tonic-gate Trace((stderr, "inflate: allocated\n"));
28417c478bd9Sstevel@tonic-gate
28427c478bd9Sstevel@tonic-gate /* reset state */
28437c478bd9Sstevel@tonic-gate inflateReset(z);
28447c478bd9Sstevel@tonic-gate return Z_OK;
28457c478bd9Sstevel@tonic-gate }
28467c478bd9Sstevel@tonic-gate
28477c478bd9Sstevel@tonic-gate
inflateInit(z)28487c478bd9Sstevel@tonic-gate int inflateInit(z)
28497c478bd9Sstevel@tonic-gate z_stream *z;
28507c478bd9Sstevel@tonic-gate {
28517c478bd9Sstevel@tonic-gate return inflateInit2(z, DEF_WBITS);
28527c478bd9Sstevel@tonic-gate }
28537c478bd9Sstevel@tonic-gate
28547c478bd9Sstevel@tonic-gate
28557c478bd9Sstevel@tonic-gate #define NEEDBYTE {if(z->avail_in==0)goto empty;r=Z_OK;}
28567c478bd9Sstevel@tonic-gate #define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
28577c478bd9Sstevel@tonic-gate
inflate(z,f)28587c478bd9Sstevel@tonic-gate int inflate(z, f)
28597c478bd9Sstevel@tonic-gate z_stream *z;
28607c478bd9Sstevel@tonic-gate int f;
28617c478bd9Sstevel@tonic-gate {
28627c478bd9Sstevel@tonic-gate int r;
28637c478bd9Sstevel@tonic-gate uInt b;
28647c478bd9Sstevel@tonic-gate
28657c478bd9Sstevel@tonic-gate if (z == Z_NULL || z->next_in == Z_NULL)
28667c478bd9Sstevel@tonic-gate return Z_STREAM_ERROR;
28677c478bd9Sstevel@tonic-gate r = Z_BUF_ERROR;
28687c478bd9Sstevel@tonic-gate while (1) switch (z->state->mode)
28697c478bd9Sstevel@tonic-gate {
28707c478bd9Sstevel@tonic-gate case METHOD:
28717c478bd9Sstevel@tonic-gate NEEDBYTE
28727c478bd9Sstevel@tonic-gate if (((z->state->sub.method = NEXTBYTE) & 0xf) != DEFLATED)
28737c478bd9Sstevel@tonic-gate {
28747c478bd9Sstevel@tonic-gate z->state->mode = BAD;
28757c478bd9Sstevel@tonic-gate z->msg = "unknown compression method";
28767c478bd9Sstevel@tonic-gate z->state->sub.marker = 5; /* can't try inflateSync */
28777c478bd9Sstevel@tonic-gate break;
28787c478bd9Sstevel@tonic-gate }
28797c478bd9Sstevel@tonic-gate if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
28807c478bd9Sstevel@tonic-gate {
28817c478bd9Sstevel@tonic-gate z->state->mode = BAD;
28827c478bd9Sstevel@tonic-gate z->msg = "invalid window size";
28837c478bd9Sstevel@tonic-gate z->state->sub.marker = 5; /* can't try inflateSync */
28847c478bd9Sstevel@tonic-gate break;
28857c478bd9Sstevel@tonic-gate }
28867c478bd9Sstevel@tonic-gate z->state->mode = FLAG;
28875b85b345SToomas Soome /* FALLTHROUGH */
28887c478bd9Sstevel@tonic-gate case FLAG:
28897c478bd9Sstevel@tonic-gate NEEDBYTE
28907c478bd9Sstevel@tonic-gate if ((b = NEXTBYTE) & 0x20)
28917c478bd9Sstevel@tonic-gate {
28927c478bd9Sstevel@tonic-gate z->state->mode = BAD;
28937c478bd9Sstevel@tonic-gate z->msg = "invalid reserved bit";
28947c478bd9Sstevel@tonic-gate z->state->sub.marker = 5; /* can't try inflateSync */
28957c478bd9Sstevel@tonic-gate break;
28967c478bd9Sstevel@tonic-gate }
28977c478bd9Sstevel@tonic-gate if (((z->state->sub.method << 8) + b) % 31)
28987c478bd9Sstevel@tonic-gate {
28997c478bd9Sstevel@tonic-gate z->state->mode = BAD;
29007c478bd9Sstevel@tonic-gate z->msg = "incorrect header check";
29017c478bd9Sstevel@tonic-gate z->state->sub.marker = 5; /* can't try inflateSync */
29027c478bd9Sstevel@tonic-gate break;
29037c478bd9Sstevel@tonic-gate }
29047c478bd9Sstevel@tonic-gate Trace((stderr, "inflate: zlib header ok\n"));
29057c478bd9Sstevel@tonic-gate z->state->mode = BLOCKS;
29065b85b345SToomas Soome /* FALLTHROUGH */
29077c478bd9Sstevel@tonic-gate case BLOCKS:
29087c478bd9Sstevel@tonic-gate r = inflate_blocks(z->state->blocks, z, r);
29097c478bd9Sstevel@tonic-gate if (f == Z_PACKET_FLUSH && z->avail_in == 0 && z->avail_out != 0)
29107c478bd9Sstevel@tonic-gate r = inflate_packet_flush(z->state->blocks);
29117c478bd9Sstevel@tonic-gate if (r == Z_DATA_ERROR)
29127c478bd9Sstevel@tonic-gate {
29137c478bd9Sstevel@tonic-gate z->state->mode = BAD;
29147c478bd9Sstevel@tonic-gate z->state->sub.marker = 0; /* can try inflateSync */
29157c478bd9Sstevel@tonic-gate break;
29167c478bd9Sstevel@tonic-gate }
29177c478bd9Sstevel@tonic-gate if (r != Z_STREAM_END)
29187c478bd9Sstevel@tonic-gate return r;
29197c478bd9Sstevel@tonic-gate r = Z_OK;
29207c478bd9Sstevel@tonic-gate inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
29217c478bd9Sstevel@tonic-gate if (z->state->nowrap)
29227c478bd9Sstevel@tonic-gate {
29237c478bd9Sstevel@tonic-gate z->state->mode = DONE;
29247c478bd9Sstevel@tonic-gate break;
29257c478bd9Sstevel@tonic-gate }
29267c478bd9Sstevel@tonic-gate z->state->mode = CHECK4;
29275b85b345SToomas Soome /* FALLTHROUGH */
29287c478bd9Sstevel@tonic-gate case CHECK4:
29297c478bd9Sstevel@tonic-gate NEEDBYTE
29307c478bd9Sstevel@tonic-gate z->state->sub.check.need = (uLong)NEXTBYTE << 24;
29317c478bd9Sstevel@tonic-gate z->state->mode = CHECK3;
29325b85b345SToomas Soome /* FALLTHROUGH */
29337c478bd9Sstevel@tonic-gate case CHECK3:
29347c478bd9Sstevel@tonic-gate NEEDBYTE
29357c478bd9Sstevel@tonic-gate z->state->sub.check.need += (uLong)NEXTBYTE << 16;
29367c478bd9Sstevel@tonic-gate z->state->mode = CHECK2;
29375b85b345SToomas Soome /* FALLTHROUGH */
29387c478bd9Sstevel@tonic-gate case CHECK2:
29397c478bd9Sstevel@tonic-gate NEEDBYTE
29407c478bd9Sstevel@tonic-gate z->state->sub.check.need += (uLong)NEXTBYTE << 8;
29417c478bd9Sstevel@tonic-gate z->state->mode = CHECK1;
29425b85b345SToomas Soome /* FALLTHROUGH */
29437c478bd9Sstevel@tonic-gate case CHECK1:
29447c478bd9Sstevel@tonic-gate NEEDBYTE
29457c478bd9Sstevel@tonic-gate z->state->sub.check.need += (uLong)NEXTBYTE;
29467c478bd9Sstevel@tonic-gate
29477c478bd9Sstevel@tonic-gate if (z->state->sub.check.was != z->state->sub.check.need)
29487c478bd9Sstevel@tonic-gate {
29497c478bd9Sstevel@tonic-gate z->state->mode = BAD;
29507c478bd9Sstevel@tonic-gate z->msg = "incorrect data check";
29517c478bd9Sstevel@tonic-gate z->state->sub.marker = 5; /* can't try inflateSync */
29527c478bd9Sstevel@tonic-gate break;
29537c478bd9Sstevel@tonic-gate }
29547c478bd9Sstevel@tonic-gate Trace((stderr, "inflate: zlib check ok\n"));
29557c478bd9Sstevel@tonic-gate z->state->mode = DONE;
29565b85b345SToomas Soome /* FALLTHROUGH */
29577c478bd9Sstevel@tonic-gate case DONE:
29587c478bd9Sstevel@tonic-gate return Z_STREAM_END;
29597c478bd9Sstevel@tonic-gate case BAD:
29607c478bd9Sstevel@tonic-gate return Z_DATA_ERROR;
29617c478bd9Sstevel@tonic-gate default:
29627c478bd9Sstevel@tonic-gate return Z_STREAM_ERROR;
29637c478bd9Sstevel@tonic-gate }
29647c478bd9Sstevel@tonic-gate
29657c478bd9Sstevel@tonic-gate empty:
29667c478bd9Sstevel@tonic-gate if (f != Z_PACKET_FLUSH)
29677c478bd9Sstevel@tonic-gate return r;
29687c478bd9Sstevel@tonic-gate z->state->mode = BAD;
29697c478bd9Sstevel@tonic-gate z->state->sub.marker = 0; /* can try inflateSync */
29707c478bd9Sstevel@tonic-gate return Z_DATA_ERROR;
29717c478bd9Sstevel@tonic-gate }
29727c478bd9Sstevel@tonic-gate
29737c478bd9Sstevel@tonic-gate /*
29747c478bd9Sstevel@tonic-gate * This subroutine adds the data at next_in/avail_in to the output history
29757c478bd9Sstevel@tonic-gate * without performing any output. The output buffer must be "caught up";
29767c478bd9Sstevel@tonic-gate * i.e. no pending output (hence s->read equals s->write), and the state must
29777c478bd9Sstevel@tonic-gate * be BLOCKS (i.e. we should be willing to see the start of a series of
29787c478bd9Sstevel@tonic-gate * BLOCKS). On exit, the output will also be caught up, and the checksum
29797c478bd9Sstevel@tonic-gate * will have been updated if need be.
29807c478bd9Sstevel@tonic-gate */
29817c478bd9Sstevel@tonic-gate
inflateIncomp(z)29827c478bd9Sstevel@tonic-gate int inflateIncomp(z)
29837c478bd9Sstevel@tonic-gate z_stream *z;
29847c478bd9Sstevel@tonic-gate {
29857c478bd9Sstevel@tonic-gate if (z->state->mode != BLOCKS)
29867c478bd9Sstevel@tonic-gate return Z_DATA_ERROR;
29877c478bd9Sstevel@tonic-gate return inflate_addhistory(z->state->blocks, z);
29887c478bd9Sstevel@tonic-gate }
29897c478bd9Sstevel@tonic-gate
29907c478bd9Sstevel@tonic-gate
inflateSync(z)29917c478bd9Sstevel@tonic-gate int inflateSync(z)
29927c478bd9Sstevel@tonic-gate z_stream *z;
29937c478bd9Sstevel@tonic-gate {
29947c478bd9Sstevel@tonic-gate uInt n; /* number of bytes to look at */
29957c478bd9Sstevel@tonic-gate Bytef *p; /* pointer to bytes */
29967c478bd9Sstevel@tonic-gate uInt m; /* number of marker bytes found in a row */
29977c478bd9Sstevel@tonic-gate uLong r, w; /* temporaries to save total_in and total_out */
29987c478bd9Sstevel@tonic-gate
29997c478bd9Sstevel@tonic-gate /* set up */
30007c478bd9Sstevel@tonic-gate if (z == Z_NULL || z->state == Z_NULL)
30017c478bd9Sstevel@tonic-gate return Z_STREAM_ERROR;
30027c478bd9Sstevel@tonic-gate if (z->state->mode != BAD)
30037c478bd9Sstevel@tonic-gate {
30047c478bd9Sstevel@tonic-gate z->state->mode = BAD;
30057c478bd9Sstevel@tonic-gate z->state->sub.marker = 0;
30067c478bd9Sstevel@tonic-gate }
30077c478bd9Sstevel@tonic-gate if ((n = z->avail_in) == 0)
30087c478bd9Sstevel@tonic-gate return Z_BUF_ERROR;
30097c478bd9Sstevel@tonic-gate p = z->next_in;
30107c478bd9Sstevel@tonic-gate m = z->state->sub.marker;
30117c478bd9Sstevel@tonic-gate
30127c478bd9Sstevel@tonic-gate /* search */
30137c478bd9Sstevel@tonic-gate while (n && m < 4)
30147c478bd9Sstevel@tonic-gate {
30157c478bd9Sstevel@tonic-gate if (*p == (Byte)(m < 2 ? 0 : 0xff))
30167c478bd9Sstevel@tonic-gate m++;
30177c478bd9Sstevel@tonic-gate else if (*p)
30187c478bd9Sstevel@tonic-gate m = 0;
30197c478bd9Sstevel@tonic-gate else
30207c478bd9Sstevel@tonic-gate m = 4 - m;
30217c478bd9Sstevel@tonic-gate p++, n--;
30227c478bd9Sstevel@tonic-gate }
30237c478bd9Sstevel@tonic-gate
30247c478bd9Sstevel@tonic-gate /* restore */
30257c478bd9Sstevel@tonic-gate z->total_in += p - z->next_in;
30267c478bd9Sstevel@tonic-gate z->next_in = p;
30277c478bd9Sstevel@tonic-gate z->avail_in = n;
30287c478bd9Sstevel@tonic-gate z->state->sub.marker = m;
30297c478bd9Sstevel@tonic-gate
30307c478bd9Sstevel@tonic-gate /* return no joy or set up to restart on a new block */
30317c478bd9Sstevel@tonic-gate if (m != 4)
30327c478bd9Sstevel@tonic-gate return Z_DATA_ERROR;
30337c478bd9Sstevel@tonic-gate r = z->total_in; w = z->total_out;
30347c478bd9Sstevel@tonic-gate inflateReset(z);
30357c478bd9Sstevel@tonic-gate z->total_in = r; z->total_out = w;
30367c478bd9Sstevel@tonic-gate z->state->mode = BLOCKS;
30377c478bd9Sstevel@tonic-gate return Z_OK;
30387c478bd9Sstevel@tonic-gate }
30397c478bd9Sstevel@tonic-gate
30407c478bd9Sstevel@tonic-gate #undef NEEDBYTE
30417c478bd9Sstevel@tonic-gate #undef NEXTBYTE
30427c478bd9Sstevel@tonic-gate
30437c478bd9Sstevel@tonic-gate /*+++++*/
30447c478bd9Sstevel@tonic-gate /* infutil.h -- types and macros common to blocks and codes
30457c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
3046*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
30477c478bd9Sstevel@tonic-gate */
30487c478bd9Sstevel@tonic-gate
30497c478bd9Sstevel@tonic-gate /* WARNING: this file should *not* be used by applications. It is
30507c478bd9Sstevel@tonic-gate part of the implementation of the compression library and is
30517c478bd9Sstevel@tonic-gate subject to change. Applications should only use zlib.h.
30527c478bd9Sstevel@tonic-gate */
30537c478bd9Sstevel@tonic-gate
30547c478bd9Sstevel@tonic-gate /* inflate blocks semi-private state */
30557c478bd9Sstevel@tonic-gate struct inflate_blocks_state {
30567c478bd9Sstevel@tonic-gate
30577c478bd9Sstevel@tonic-gate /* mode */
30587c478bd9Sstevel@tonic-gate enum {
30597c478bd9Sstevel@tonic-gate TYPE, /* get type bits (3, including end bit) */
30607c478bd9Sstevel@tonic-gate LENS, /* get lengths for stored */
30617c478bd9Sstevel@tonic-gate STORED, /* processing stored block */
30627c478bd9Sstevel@tonic-gate TABLE, /* get table lengths */
30637c478bd9Sstevel@tonic-gate BTREE, /* get bit lengths tree for a dynamic block */
30647c478bd9Sstevel@tonic-gate DTREE, /* get length, distance trees for a dynamic block */
30657c478bd9Sstevel@tonic-gate CODES, /* processing fixed or dynamic block */
30667c478bd9Sstevel@tonic-gate DRY, /* output remaining window bytes */
30677c478bd9Sstevel@tonic-gate DONEB, /* finished last block, done */
30687c478bd9Sstevel@tonic-gate BADB} /* got a data error--stuck here */
30697c478bd9Sstevel@tonic-gate mode; /* current inflate_block mode */
30707c478bd9Sstevel@tonic-gate
30717c478bd9Sstevel@tonic-gate /* mode dependent information */
30727c478bd9Sstevel@tonic-gate union {
30737c478bd9Sstevel@tonic-gate uInt left; /* if STORED, bytes left to copy */
30747c478bd9Sstevel@tonic-gate struct {
30757c478bd9Sstevel@tonic-gate uInt table; /* table lengths (14 bits) */
30767c478bd9Sstevel@tonic-gate uInt index; /* index into blens (or border) */
30777c478bd9Sstevel@tonic-gate uIntf *blens; /* bit lengths of codes */
30787c478bd9Sstevel@tonic-gate uInt bb; /* bit length tree depth */
30797c478bd9Sstevel@tonic-gate inflate_huft *tb; /* bit length decoding tree */
30807c478bd9Sstevel@tonic-gate int nblens; /* # elements allocated at blens */
30817c478bd9Sstevel@tonic-gate } trees; /* if DTREE, decoding info for trees */
30827c478bd9Sstevel@tonic-gate struct {
30837c478bd9Sstevel@tonic-gate inflate_huft *tl, *td; /* trees to free */
3084*55fea89dSDan Cross inflate_codes_statef
30857c478bd9Sstevel@tonic-gate *codes;
30867c478bd9Sstevel@tonic-gate } decode; /* if CODES, current state */
30877c478bd9Sstevel@tonic-gate } sub; /* submode */
30887c478bd9Sstevel@tonic-gate uInt last; /* true if this block is the last block */
30897c478bd9Sstevel@tonic-gate
30907c478bd9Sstevel@tonic-gate /* mode independent information */
30917c478bd9Sstevel@tonic-gate uInt bitk; /* bits in bit buffer */
30927c478bd9Sstevel@tonic-gate uLong bitb; /* bit buffer */
30937c478bd9Sstevel@tonic-gate Bytef *window; /* sliding window */
30947c478bd9Sstevel@tonic-gate Bytef *end; /* one byte after sliding window */
30957c478bd9Sstevel@tonic-gate Bytef *read; /* window read pointer */
30967c478bd9Sstevel@tonic-gate Bytef *write; /* window write pointer */
30977c478bd9Sstevel@tonic-gate check_func checkfn; /* check function */
30987c478bd9Sstevel@tonic-gate uLong check; /* check on output */
30997c478bd9Sstevel@tonic-gate
31007c478bd9Sstevel@tonic-gate };
31017c478bd9Sstevel@tonic-gate
31027c478bd9Sstevel@tonic-gate
31037c478bd9Sstevel@tonic-gate /* defines for inflate input/output */
31047c478bd9Sstevel@tonic-gate /* update pointers and return */
31057c478bd9Sstevel@tonic-gate #define UPDBITS {s->bitb=b;s->bitk=k;}
31067c478bd9Sstevel@tonic-gate #define UPDIN {z->avail_in=n;z->total_in+=p-z->next_in;z->next_in=p;}
31077c478bd9Sstevel@tonic-gate #define UPDOUT {s->write=q;}
31087c478bd9Sstevel@tonic-gate #define UPDATE {UPDBITS UPDIN UPDOUT}
31097c478bd9Sstevel@tonic-gate #define LEAVE {UPDATE return inflate_flush(s,z,r);}
31107c478bd9Sstevel@tonic-gate /* get bytes and bits */
31117c478bd9Sstevel@tonic-gate #define LOADIN {p=z->next_in;n=z->avail_in;b=s->bitb;k=s->bitk;}
31127c478bd9Sstevel@tonic-gate #define NEEDBYTE {if(n)r=Z_OK;else LEAVE}
31137c478bd9Sstevel@tonic-gate #define NEXTBYTE (n--,*p++)
31147c478bd9Sstevel@tonic-gate #define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}}
31157c478bd9Sstevel@tonic-gate #define DUMPBITS(j) {b>>=(j);k-=(j);}
31167c478bd9Sstevel@tonic-gate /* output bytes */
31177c478bd9Sstevel@tonic-gate #define WAVAIL (q<s->read?s->read-q-1:s->end-q)
31187c478bd9Sstevel@tonic-gate #define LOADOUT {q=s->write;m=WAVAIL;}
31197c478bd9Sstevel@tonic-gate #define WRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=WAVAIL;}}
31207c478bd9Sstevel@tonic-gate #define FLUSH {UPDOUT r=inflate_flush(s,z,r); LOADOUT}
31217c478bd9Sstevel@tonic-gate #define NEEDOUT {if(m==0){WRAP if(m==0){FLUSH WRAP if(m==0) LEAVE}}r=Z_OK;}
31227c478bd9Sstevel@tonic-gate #define OUTBYTE(a) {*q++=(Byte)(a);m--;}
31237c478bd9Sstevel@tonic-gate /* load local pointers */
31247c478bd9Sstevel@tonic-gate #define LOAD {LOADIN LOADOUT}
31257c478bd9Sstevel@tonic-gate
31267c478bd9Sstevel@tonic-gate /* And'ing with mask[n] masks the lower n bits */
31277c478bd9Sstevel@tonic-gate local uInt inflate_mask[] = {
31287c478bd9Sstevel@tonic-gate 0x0000,
31297c478bd9Sstevel@tonic-gate 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
31307c478bd9Sstevel@tonic-gate 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
31317c478bd9Sstevel@tonic-gate };
31327c478bd9Sstevel@tonic-gate
31337c478bd9Sstevel@tonic-gate /* copy as much as possible from the sliding window to the output area */
31347c478bd9Sstevel@tonic-gate local int inflate_flush OF((
31357c478bd9Sstevel@tonic-gate inflate_blocks_statef *,
31367c478bd9Sstevel@tonic-gate z_stream *,
31377c478bd9Sstevel@tonic-gate int));
31387c478bd9Sstevel@tonic-gate
31397c478bd9Sstevel@tonic-gate /*+++++*/
31407c478bd9Sstevel@tonic-gate /* inffast.h -- header to use inffast.c
31417c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
3142*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
31437c478bd9Sstevel@tonic-gate */
31447c478bd9Sstevel@tonic-gate
31457c478bd9Sstevel@tonic-gate /* WARNING: this file should *not* be used by applications. It is
31467c478bd9Sstevel@tonic-gate part of the implementation of the compression library and is
31477c478bd9Sstevel@tonic-gate subject to change. Applications should only use zlib.h.
31487c478bd9Sstevel@tonic-gate */
31497c478bd9Sstevel@tonic-gate
31507c478bd9Sstevel@tonic-gate local int inflate_fast OF((
31517c478bd9Sstevel@tonic-gate uInt,
31527c478bd9Sstevel@tonic-gate uInt,
31537c478bd9Sstevel@tonic-gate inflate_huft *,
31547c478bd9Sstevel@tonic-gate inflate_huft *,
31557c478bd9Sstevel@tonic-gate inflate_blocks_statef *,
31567c478bd9Sstevel@tonic-gate z_stream *));
31577c478bd9Sstevel@tonic-gate
31587c478bd9Sstevel@tonic-gate
31597c478bd9Sstevel@tonic-gate /*+++++*/
31607c478bd9Sstevel@tonic-gate /* infblock.c -- interpret and process block types to last block
31617c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
3162*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
31637c478bd9Sstevel@tonic-gate */
31647c478bd9Sstevel@tonic-gate
31657c478bd9Sstevel@tonic-gate /* Table for deflate from PKZIP's appnote.txt. */
31667c478bd9Sstevel@tonic-gate local uInt border[] = { /* Order of the bit length code lengths */
31677c478bd9Sstevel@tonic-gate 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
31687c478bd9Sstevel@tonic-gate
31697c478bd9Sstevel@tonic-gate /*
31707c478bd9Sstevel@tonic-gate Notes beyond the 1.93a appnote.txt:
31717c478bd9Sstevel@tonic-gate
31727c478bd9Sstevel@tonic-gate 1. Distance pointers never point before the beginning of the output
31737c478bd9Sstevel@tonic-gate stream.
31747c478bd9Sstevel@tonic-gate 2. Distance pointers can point back across blocks, up to 32k away.
31757c478bd9Sstevel@tonic-gate 3. There is an implied maximum of 7 bits for the bit length table and
31767c478bd9Sstevel@tonic-gate 15 bits for the actual data.
31777c478bd9Sstevel@tonic-gate 4. If only one code exists, then it is encoded using one bit. (Zero
31787c478bd9Sstevel@tonic-gate would be more efficient, but perhaps a little confusing.) If two
31797c478bd9Sstevel@tonic-gate codes exist, they are coded using one bit each (0 and 1).
31807c478bd9Sstevel@tonic-gate 5. There is no way of sending zero distance codes--a dummy must be
31817c478bd9Sstevel@tonic-gate sent if there are none. (History: a pre 2.0 version of PKZIP would
31827c478bd9Sstevel@tonic-gate store blocks with no distance codes, but this was discovered to be
31837c478bd9Sstevel@tonic-gate too harsh a criterion.) Valid only for 1.93a. 2.04c does allow
31847c478bd9Sstevel@tonic-gate zero distance codes, which is sent as one code of zero bits in
31857c478bd9Sstevel@tonic-gate length.
31867c478bd9Sstevel@tonic-gate 6. There are up to 286 literal/length codes. Code 256 represents the
31877c478bd9Sstevel@tonic-gate end-of-block. Note however that the static length tree defines
31887c478bd9Sstevel@tonic-gate 288 codes just to fill out the Huffman codes. Codes 286 and 287
31897c478bd9Sstevel@tonic-gate cannot be used though, since there is no length base or extra bits
31907c478bd9Sstevel@tonic-gate defined for them. Similarily, there are up to 30 distance codes.
31917c478bd9Sstevel@tonic-gate However, static trees define 32 codes (all 5 bits) to fill out the
31927c478bd9Sstevel@tonic-gate Huffman codes, but the last two had better not show up in the data.
31937c478bd9Sstevel@tonic-gate 7. Unzip can check dynamic Huffman blocks for complete code sets.
31947c478bd9Sstevel@tonic-gate The exception is that a single code would not be complete (see #4).
31957c478bd9Sstevel@tonic-gate 8. The five bits following the block type is really the number of
31967c478bd9Sstevel@tonic-gate literal codes sent minus 257.
31977c478bd9Sstevel@tonic-gate 9. Length codes 8,16,16 are interpreted as 13 length codes of 8 bits
31987c478bd9Sstevel@tonic-gate (1+6+6). Therefore, to output three times the length, you output
31997c478bd9Sstevel@tonic-gate three codes (1+1+1), whereas to output four times the same length,
32007c478bd9Sstevel@tonic-gate you only need two codes (1+3). Hmm.
32017c478bd9Sstevel@tonic-gate 10. In the tree reconstruction algorithm, Code = Code + Increment
32027c478bd9Sstevel@tonic-gate only if BitLength(i) is not zero. (Pretty obvious.)
32037c478bd9Sstevel@tonic-gate 11. Correction: 4 Bits: # of Bit Length codes - 4 (4 - 19)
32047c478bd9Sstevel@tonic-gate 12. Note: length code 284 can represent 227-258, but length code 285
32057c478bd9Sstevel@tonic-gate really is 258. The last length deserves its own, short code
32067c478bd9Sstevel@tonic-gate since it gets used a lot in very redundant files. The length
32077c478bd9Sstevel@tonic-gate 258 is special since 258 - 3 (the min match length) is 255.
32087c478bd9Sstevel@tonic-gate 13. The literal/length and distance code bit lengths are read as a
32097c478bd9Sstevel@tonic-gate single stream of lengths. It is possible (and advantageous) for
32107c478bd9Sstevel@tonic-gate a repeat code (16, 17, or 18) to go across the boundary between
32117c478bd9Sstevel@tonic-gate the two sets of lengths.
32127c478bd9Sstevel@tonic-gate */
32137c478bd9Sstevel@tonic-gate
32147c478bd9Sstevel@tonic-gate
inflate_blocks_reset(s,z,c)32157c478bd9Sstevel@tonic-gate local void inflate_blocks_reset(s, z, c)
32167c478bd9Sstevel@tonic-gate inflate_blocks_statef *s;
32177c478bd9Sstevel@tonic-gate z_stream *z;
32187c478bd9Sstevel@tonic-gate uLongf *c;
32197c478bd9Sstevel@tonic-gate {
32207c478bd9Sstevel@tonic-gate if (s->checkfn != Z_NULL)
32217c478bd9Sstevel@tonic-gate *c = s->check;
32227c478bd9Sstevel@tonic-gate if (s->mode == BTREE || s->mode == DTREE)
32237c478bd9Sstevel@tonic-gate ZFREE(z, s->sub.trees.blens, s->sub.trees.nblens * sizeof(uInt));
32247c478bd9Sstevel@tonic-gate if (s->mode == CODES)
32257c478bd9Sstevel@tonic-gate {
32267c478bd9Sstevel@tonic-gate inflate_codes_free(s->sub.decode.codes, z);
32277c478bd9Sstevel@tonic-gate inflate_trees_free(s->sub.decode.td, z);
32287c478bd9Sstevel@tonic-gate inflate_trees_free(s->sub.decode.tl, z);
32297c478bd9Sstevel@tonic-gate }
32307c478bd9Sstevel@tonic-gate s->mode = TYPE;
32317c478bd9Sstevel@tonic-gate s->bitk = 0;
32327c478bd9Sstevel@tonic-gate s->bitb = 0;
32337c478bd9Sstevel@tonic-gate s->read = s->write = s->window;
32347c478bd9Sstevel@tonic-gate if (s->checkfn != Z_NULL)
32357c478bd9Sstevel@tonic-gate s->check = (*s->checkfn)(0L, Z_NULL, 0);
32367c478bd9Sstevel@tonic-gate Trace((stderr, "inflate: blocks reset\n"));
32377c478bd9Sstevel@tonic-gate }
32387c478bd9Sstevel@tonic-gate
32397c478bd9Sstevel@tonic-gate
inflate_blocks_new(z,c,w)32407c478bd9Sstevel@tonic-gate local inflate_blocks_statef *inflate_blocks_new(z, c, w)
32417c478bd9Sstevel@tonic-gate z_stream *z;
32427c478bd9Sstevel@tonic-gate check_func c;
32437c478bd9Sstevel@tonic-gate uInt w;
32447c478bd9Sstevel@tonic-gate {
32457c478bd9Sstevel@tonic-gate inflate_blocks_statef *s;
32467c478bd9Sstevel@tonic-gate
32477c478bd9Sstevel@tonic-gate if ((s = (inflate_blocks_statef *)ZALLOC
32487c478bd9Sstevel@tonic-gate (z,1,sizeof(struct inflate_blocks_state))) == Z_NULL)
32497c478bd9Sstevel@tonic-gate return s;
32507c478bd9Sstevel@tonic-gate if ((s->window = (Bytef *)ZALLOC(z, 1, w)) == Z_NULL)
32517c478bd9Sstevel@tonic-gate {
32527c478bd9Sstevel@tonic-gate ZFREE(z, s, sizeof(struct inflate_blocks_state));
32537c478bd9Sstevel@tonic-gate return Z_NULL;
32547c478bd9Sstevel@tonic-gate }
32557c478bd9Sstevel@tonic-gate s->end = s->window + w;
32567c478bd9Sstevel@tonic-gate s->checkfn = c;
32577c478bd9Sstevel@tonic-gate s->mode = TYPE;
32587c478bd9Sstevel@tonic-gate Trace((stderr, "inflate: blocks allocated\n"));
32597c478bd9Sstevel@tonic-gate inflate_blocks_reset(s, z, &s->check);
32607c478bd9Sstevel@tonic-gate return s;
32617c478bd9Sstevel@tonic-gate }
32627c478bd9Sstevel@tonic-gate
32637c478bd9Sstevel@tonic-gate
inflate_blocks(s,z,r)32647c478bd9Sstevel@tonic-gate local int inflate_blocks(s, z, r)
32657c478bd9Sstevel@tonic-gate inflate_blocks_statef *s;
32667c478bd9Sstevel@tonic-gate z_stream *z;
32677c478bd9Sstevel@tonic-gate int r;
32687c478bd9Sstevel@tonic-gate {
32697c478bd9Sstevel@tonic-gate uInt t; /* temporary storage */
32707c478bd9Sstevel@tonic-gate uLong b; /* bit buffer */
32717c478bd9Sstevel@tonic-gate uInt k; /* bits in bit buffer */
32727c478bd9Sstevel@tonic-gate Bytef *p; /* input data pointer */
32737c478bd9Sstevel@tonic-gate uInt n; /* bytes available there */
32747c478bd9Sstevel@tonic-gate Bytef *q; /* output window write pointer */
32757c478bd9Sstevel@tonic-gate uInt m; /* bytes to end of window or read pointer */
32767c478bd9Sstevel@tonic-gate
32777c478bd9Sstevel@tonic-gate /* copy input/output information to locals (UPDATE macro restores) */
32787c478bd9Sstevel@tonic-gate LOAD
32797c478bd9Sstevel@tonic-gate
32807c478bd9Sstevel@tonic-gate /* process input based on current state */
32817c478bd9Sstevel@tonic-gate while (1) switch (s->mode)
32827c478bd9Sstevel@tonic-gate {
32837c478bd9Sstevel@tonic-gate case TYPE:
32847c478bd9Sstevel@tonic-gate NEEDBITS(3)
32857c478bd9Sstevel@tonic-gate t = (uInt)b & 7;
32867c478bd9Sstevel@tonic-gate s->last = t & 1;
32877c478bd9Sstevel@tonic-gate switch (t >> 1)
32887c478bd9Sstevel@tonic-gate {
32897c478bd9Sstevel@tonic-gate case 0: /* stored */
32907c478bd9Sstevel@tonic-gate Trace((stderr, "inflate: stored block%s\n",
32917c478bd9Sstevel@tonic-gate s->last ? " (last)" : ""));
32927c478bd9Sstevel@tonic-gate DUMPBITS(3)
32937c478bd9Sstevel@tonic-gate t = k & 7; /* go to byte boundary */
32947c478bd9Sstevel@tonic-gate DUMPBITS(t)
32957c478bd9Sstevel@tonic-gate s->mode = LENS; /* get length of stored block */
32967c478bd9Sstevel@tonic-gate break;
32977c478bd9Sstevel@tonic-gate case 1: /* fixed */
32987c478bd9Sstevel@tonic-gate Trace((stderr, "inflate: fixed codes block%s\n",
32997c478bd9Sstevel@tonic-gate s->last ? " (last)" : ""));
33007c478bd9Sstevel@tonic-gate {
33017c478bd9Sstevel@tonic-gate uInt bl, bd;
33027c478bd9Sstevel@tonic-gate inflate_huft *tl, *td;
33037c478bd9Sstevel@tonic-gate
33047c478bd9Sstevel@tonic-gate inflate_trees_fixed(&bl, &bd, &tl, &td);
33057c478bd9Sstevel@tonic-gate s->sub.decode.codes = inflate_codes_new(bl, bd, tl, td, z);
33067c478bd9Sstevel@tonic-gate if (s->sub.decode.codes == Z_NULL)
33077c478bd9Sstevel@tonic-gate {
33087c478bd9Sstevel@tonic-gate r = Z_MEM_ERROR;
33097c478bd9Sstevel@tonic-gate LEAVE
33107c478bd9Sstevel@tonic-gate }
33117c478bd9Sstevel@tonic-gate s->sub.decode.tl = Z_NULL; /* don't try to free these */
33127c478bd9Sstevel@tonic-gate s->sub.decode.td = Z_NULL;
33137c478bd9Sstevel@tonic-gate }
33147c478bd9Sstevel@tonic-gate DUMPBITS(3)
33157c478bd9Sstevel@tonic-gate s->mode = CODES;
33167c478bd9Sstevel@tonic-gate break;
33177c478bd9Sstevel@tonic-gate case 2: /* dynamic */
33187c478bd9Sstevel@tonic-gate Trace((stderr, "inflate: dynamic codes block%s\n",
33197c478bd9Sstevel@tonic-gate s->last ? " (last)" : ""));
33207c478bd9Sstevel@tonic-gate DUMPBITS(3)
33217c478bd9Sstevel@tonic-gate s->mode = TABLE;
33227c478bd9Sstevel@tonic-gate break;
33237c478bd9Sstevel@tonic-gate case 3: /* illegal */
33247c478bd9Sstevel@tonic-gate DUMPBITS(3)
33257c478bd9Sstevel@tonic-gate s->mode = BADB;
33267c478bd9Sstevel@tonic-gate z->msg = "invalid block type";
33277c478bd9Sstevel@tonic-gate r = Z_DATA_ERROR;
33287c478bd9Sstevel@tonic-gate LEAVE
33297c478bd9Sstevel@tonic-gate }
33307c478bd9Sstevel@tonic-gate break;
33317c478bd9Sstevel@tonic-gate case LENS:
33327c478bd9Sstevel@tonic-gate NEEDBITS(32)
33337c478bd9Sstevel@tonic-gate if (((~b) >> 16) != (b & 0xffff))
33347c478bd9Sstevel@tonic-gate {
33357c478bd9Sstevel@tonic-gate s->mode = BADB;
33367c478bd9Sstevel@tonic-gate z->msg = "invalid stored block lengths";
33377c478bd9Sstevel@tonic-gate r = Z_DATA_ERROR;
33387c478bd9Sstevel@tonic-gate LEAVE
33397c478bd9Sstevel@tonic-gate }
33407c478bd9Sstevel@tonic-gate s->sub.left = (uInt)b & 0xffff;
33417c478bd9Sstevel@tonic-gate b = k = 0; /* dump bits */
33427c478bd9Sstevel@tonic-gate Tracev((stderr, "inflate: stored length %u\n", s->sub.left));
33437c478bd9Sstevel@tonic-gate s->mode = s->sub.left ? STORED : TYPE;
33447c478bd9Sstevel@tonic-gate break;
33457c478bd9Sstevel@tonic-gate case STORED:
33467c478bd9Sstevel@tonic-gate if (n == 0)
33477c478bd9Sstevel@tonic-gate LEAVE
33487c478bd9Sstevel@tonic-gate NEEDOUT
33497c478bd9Sstevel@tonic-gate t = s->sub.left;
33507c478bd9Sstevel@tonic-gate if (t > n) t = n;
33517c478bd9Sstevel@tonic-gate if (t > m) t = m;
33527c478bd9Sstevel@tonic-gate zmemcpy(q, p, t);
33537c478bd9Sstevel@tonic-gate p += t; n -= t;
33547c478bd9Sstevel@tonic-gate q += t; m -= t;
33557c478bd9Sstevel@tonic-gate if ((s->sub.left -= t) != 0)
33567c478bd9Sstevel@tonic-gate break;
33577c478bd9Sstevel@tonic-gate Tracev((stderr, "inflate: stored end, %lu total out\n",
33587c478bd9Sstevel@tonic-gate z->total_out + (q >= s->read ? q - s->read :
33597c478bd9Sstevel@tonic-gate (s->end - s->read) + (q - s->window))));
33607c478bd9Sstevel@tonic-gate s->mode = s->last ? DRY : TYPE;
33617c478bd9Sstevel@tonic-gate break;
33627c478bd9Sstevel@tonic-gate case TABLE:
33637c478bd9Sstevel@tonic-gate NEEDBITS(14)
33647c478bd9Sstevel@tonic-gate s->sub.trees.table = t = (uInt)b & 0x3fff;
33657c478bd9Sstevel@tonic-gate #ifndef PKZIP_BUG_WORKAROUND
33667c478bd9Sstevel@tonic-gate if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29)
33677c478bd9Sstevel@tonic-gate {
33687c478bd9Sstevel@tonic-gate s->mode = BADB;
33697c478bd9Sstevel@tonic-gate z->msg = "too many length or distance symbols";
33707c478bd9Sstevel@tonic-gate r = Z_DATA_ERROR;
33717c478bd9Sstevel@tonic-gate LEAVE
33727c478bd9Sstevel@tonic-gate }
33737c478bd9Sstevel@tonic-gate #endif
33747c478bd9Sstevel@tonic-gate t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
33757c478bd9Sstevel@tonic-gate if (t < 19)
33767c478bd9Sstevel@tonic-gate t = 19;
33777c478bd9Sstevel@tonic-gate if ((s->sub.trees.blens = (uIntf*)ZALLOC(z, t, sizeof(uInt))) == Z_NULL)
33787c478bd9Sstevel@tonic-gate {
33797c478bd9Sstevel@tonic-gate r = Z_MEM_ERROR;
33807c478bd9Sstevel@tonic-gate LEAVE
33817c478bd9Sstevel@tonic-gate }
33827c478bd9Sstevel@tonic-gate s->sub.trees.nblens = t;
33837c478bd9Sstevel@tonic-gate DUMPBITS(14)
33847c478bd9Sstevel@tonic-gate s->sub.trees.index = 0;
33857c478bd9Sstevel@tonic-gate Tracev((stderr, "inflate: table sizes ok\n"));
33867c478bd9Sstevel@tonic-gate s->mode = BTREE;
33877c478bd9Sstevel@tonic-gate case BTREE:
33887c478bd9Sstevel@tonic-gate while (s->sub.trees.index < 4 + (s->sub.trees.table >> 10))
33897c478bd9Sstevel@tonic-gate {
33907c478bd9Sstevel@tonic-gate NEEDBITS(3)
33917c478bd9Sstevel@tonic-gate s->sub.trees.blens[border[s->sub.trees.index++]] = (uInt)b & 7;
33927c478bd9Sstevel@tonic-gate DUMPBITS(3)
33937c478bd9Sstevel@tonic-gate }
33947c478bd9Sstevel@tonic-gate while (s->sub.trees.index < 19)
33957c478bd9Sstevel@tonic-gate s->sub.trees.blens[border[s->sub.trees.index++]] = 0;
33967c478bd9Sstevel@tonic-gate s->sub.trees.bb = 7;
33977c478bd9Sstevel@tonic-gate t = inflate_trees_bits(s->sub.trees.blens, &s->sub.trees.bb,
33987c478bd9Sstevel@tonic-gate &s->sub.trees.tb, z);
33997c478bd9Sstevel@tonic-gate if (t != Z_OK)
34007c478bd9Sstevel@tonic-gate {
34017c478bd9Sstevel@tonic-gate r = t;
34027c478bd9Sstevel@tonic-gate if (r == Z_DATA_ERROR)
34037c478bd9Sstevel@tonic-gate s->mode = BADB;
34047c478bd9Sstevel@tonic-gate LEAVE
34057c478bd9Sstevel@tonic-gate }
34067c478bd9Sstevel@tonic-gate s->sub.trees.index = 0;
34077c478bd9Sstevel@tonic-gate Tracev((stderr, "inflate: bits tree ok\n"));
34087c478bd9Sstevel@tonic-gate s->mode = DTREE;
34097c478bd9Sstevel@tonic-gate case DTREE:
34107c478bd9Sstevel@tonic-gate while (t = s->sub.trees.table,
34117c478bd9Sstevel@tonic-gate s->sub.trees.index < 258 + (t & 0x1f) + ((t >> 5) & 0x1f))
34127c478bd9Sstevel@tonic-gate {
34137c478bd9Sstevel@tonic-gate inflate_huft *h;
34147c478bd9Sstevel@tonic-gate uInt i, j, c;
34157c478bd9Sstevel@tonic-gate
34167c478bd9Sstevel@tonic-gate t = s->sub.trees.bb;
34177c478bd9Sstevel@tonic-gate NEEDBITS(t)
34187c478bd9Sstevel@tonic-gate h = s->sub.trees.tb + ((uInt)b & inflate_mask[t]);
34197c478bd9Sstevel@tonic-gate t = h->word.what.Bits;
34207c478bd9Sstevel@tonic-gate c = h->more.Base;
34217c478bd9Sstevel@tonic-gate if (c < 16)
34227c478bd9Sstevel@tonic-gate {
34237c478bd9Sstevel@tonic-gate DUMPBITS(t)
34247c478bd9Sstevel@tonic-gate s->sub.trees.blens[s->sub.trees.index++] = c;
34257c478bd9Sstevel@tonic-gate }
34267c478bd9Sstevel@tonic-gate else /* c == 16..18 */
34277c478bd9Sstevel@tonic-gate {
34287c478bd9Sstevel@tonic-gate i = c == 18 ? 7 : c - 14;
34297c478bd9Sstevel@tonic-gate j = c == 18 ? 11 : 3;
34307c478bd9Sstevel@tonic-gate NEEDBITS(t + i)
34317c478bd9Sstevel@tonic-gate DUMPBITS(t)
34327c478bd9Sstevel@tonic-gate j += (uInt)b & inflate_mask[i];
34337c478bd9Sstevel@tonic-gate DUMPBITS(i)
34347c478bd9Sstevel@tonic-gate i = s->sub.trees.index;
34357c478bd9Sstevel@tonic-gate t = s->sub.trees.table;
34367c478bd9Sstevel@tonic-gate if (i + j > 258 + (t & 0x1f) + ((t >> 5) & 0x1f) ||
34377c478bd9Sstevel@tonic-gate (c == 16 && i < 1))
34387c478bd9Sstevel@tonic-gate {
34397c478bd9Sstevel@tonic-gate s->mode = BADB;
34407c478bd9Sstevel@tonic-gate z->msg = "invalid bit length repeat";
34417c478bd9Sstevel@tonic-gate r = Z_DATA_ERROR;
34427c478bd9Sstevel@tonic-gate LEAVE
34437c478bd9Sstevel@tonic-gate }
34447c478bd9Sstevel@tonic-gate c = c == 16 ? s->sub.trees.blens[i - 1] : 0;
34457c478bd9Sstevel@tonic-gate do {
34467c478bd9Sstevel@tonic-gate s->sub.trees.blens[i++] = c;
34477c478bd9Sstevel@tonic-gate } while (--j);
34487c478bd9Sstevel@tonic-gate s->sub.trees.index = i;
34497c478bd9Sstevel@tonic-gate }
34507c478bd9Sstevel@tonic-gate }
34517c478bd9Sstevel@tonic-gate inflate_trees_free(s->sub.trees.tb, z);
34527c478bd9Sstevel@tonic-gate s->sub.trees.tb = Z_NULL;
34537c478bd9Sstevel@tonic-gate {
34547c478bd9Sstevel@tonic-gate uInt bl, bd;
34557c478bd9Sstevel@tonic-gate inflate_huft *tl, *td;
34567c478bd9Sstevel@tonic-gate inflate_codes_statef *c;
34577c478bd9Sstevel@tonic-gate
34587c478bd9Sstevel@tonic-gate bl = 9; /* must be <= 9 for lookahead assumptions */
34597c478bd9Sstevel@tonic-gate bd = 6; /* must be <= 9 for lookahead assumptions */
34607c478bd9Sstevel@tonic-gate t = s->sub.trees.table;
34617c478bd9Sstevel@tonic-gate t = inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f),
34627c478bd9Sstevel@tonic-gate s->sub.trees.blens, &bl, &bd, &tl, &td, z);
34637c478bd9Sstevel@tonic-gate if (t != Z_OK)
34647c478bd9Sstevel@tonic-gate {
34657c478bd9Sstevel@tonic-gate if (t == (uInt)Z_DATA_ERROR)
34667c478bd9Sstevel@tonic-gate s->mode = BADB;
34677c478bd9Sstevel@tonic-gate r = t;
34687c478bd9Sstevel@tonic-gate LEAVE
34697c478bd9Sstevel@tonic-gate }
34707c478bd9Sstevel@tonic-gate Tracev((stderr, "inflate: trees ok\n"));
34717c478bd9Sstevel@tonic-gate if ((c = inflate_codes_new(bl, bd, tl, td, z)) == Z_NULL)
34727c478bd9Sstevel@tonic-gate {
34737c478bd9Sstevel@tonic-gate inflate_trees_free(td, z);
34747c478bd9Sstevel@tonic-gate inflate_trees_free(tl, z);
34757c478bd9Sstevel@tonic-gate r = Z_MEM_ERROR;
34767c478bd9Sstevel@tonic-gate LEAVE
34777c478bd9Sstevel@tonic-gate }
34787c478bd9Sstevel@tonic-gate ZFREE(z, s->sub.trees.blens, s->sub.trees.nblens * sizeof(uInt));
34797c478bd9Sstevel@tonic-gate s->sub.decode.codes = c;
34807c478bd9Sstevel@tonic-gate s->sub.decode.tl = tl;
34817c478bd9Sstevel@tonic-gate s->sub.decode.td = td;
34827c478bd9Sstevel@tonic-gate }
34837c478bd9Sstevel@tonic-gate s->mode = CODES;
34845b85b345SToomas Soome /* FALLTHROUGH */
34857c478bd9Sstevel@tonic-gate case CODES:
34867c478bd9Sstevel@tonic-gate UPDATE
34877c478bd9Sstevel@tonic-gate if ((r = inflate_codes(s, z, r)) != Z_STREAM_END)
34887c478bd9Sstevel@tonic-gate return inflate_flush(s, z, r);
34897c478bd9Sstevel@tonic-gate r = Z_OK;
34907c478bd9Sstevel@tonic-gate inflate_codes_free(s->sub.decode.codes, z);
34917c478bd9Sstevel@tonic-gate inflate_trees_free(s->sub.decode.td, z);
34927c478bd9Sstevel@tonic-gate inflate_trees_free(s->sub.decode.tl, z);
34937c478bd9Sstevel@tonic-gate LOAD
34947c478bd9Sstevel@tonic-gate Tracev((stderr, "inflate: codes end, %lu total out\n",
34957c478bd9Sstevel@tonic-gate z->total_out + (q >= s->read ? q - s->read :
34967c478bd9Sstevel@tonic-gate (s->end - s->read) + (q - s->window))));
34977c478bd9Sstevel@tonic-gate if (!s->last)
34987c478bd9Sstevel@tonic-gate {
34997c478bd9Sstevel@tonic-gate s->mode = TYPE;
35007c478bd9Sstevel@tonic-gate break;
35017c478bd9Sstevel@tonic-gate }
35027c478bd9Sstevel@tonic-gate if (k > 7) /* return unused byte, if any */
35037c478bd9Sstevel@tonic-gate {
35047c478bd9Sstevel@tonic-gate Assert(k < 16, "inflate_codes grabbed too many bytes")
35057c478bd9Sstevel@tonic-gate k -= 8;
35067c478bd9Sstevel@tonic-gate n++;
35077c478bd9Sstevel@tonic-gate p--; /* can always return one */
35087c478bd9Sstevel@tonic-gate }
35097c478bd9Sstevel@tonic-gate s->mode = DRY;
35105b85b345SToomas Soome /* FALLTHROUGH */
35117c478bd9Sstevel@tonic-gate case DRY:
35127c478bd9Sstevel@tonic-gate FLUSH
35137c478bd9Sstevel@tonic-gate if (s->read != s->write)
35147c478bd9Sstevel@tonic-gate LEAVE
35157c478bd9Sstevel@tonic-gate s->mode = DONEB;
35165b85b345SToomas Soome /* FALLTHROUGH */
35177c478bd9Sstevel@tonic-gate case DONEB:
35187c478bd9Sstevel@tonic-gate r = Z_STREAM_END;
35197c478bd9Sstevel@tonic-gate LEAVE
35207c478bd9Sstevel@tonic-gate case BADB:
35217c478bd9Sstevel@tonic-gate r = Z_DATA_ERROR;
35227c478bd9Sstevel@tonic-gate LEAVE
35237c478bd9Sstevel@tonic-gate default:
35247c478bd9Sstevel@tonic-gate r = Z_STREAM_ERROR;
35257c478bd9Sstevel@tonic-gate LEAVE
35267c478bd9Sstevel@tonic-gate }
35277c478bd9Sstevel@tonic-gate }
35287c478bd9Sstevel@tonic-gate
35297c478bd9Sstevel@tonic-gate
inflate_blocks_free(s,z,c)35307c478bd9Sstevel@tonic-gate local int inflate_blocks_free(s, z, c)
35317c478bd9Sstevel@tonic-gate inflate_blocks_statef *s;
35327c478bd9Sstevel@tonic-gate z_stream *z;
35337c478bd9Sstevel@tonic-gate uLongf *c;
35347c478bd9Sstevel@tonic-gate {
35357c478bd9Sstevel@tonic-gate inflate_blocks_reset(s, z, c);
35367c478bd9Sstevel@tonic-gate ZFREE(z, s->window, s->end - s->window);
35377c478bd9Sstevel@tonic-gate ZFREE(z, s, sizeof(struct inflate_blocks_state));
35387c478bd9Sstevel@tonic-gate Trace((stderr, "inflate: blocks freed\n"));
35397c478bd9Sstevel@tonic-gate return Z_OK;
35407c478bd9Sstevel@tonic-gate }
35417c478bd9Sstevel@tonic-gate
35427c478bd9Sstevel@tonic-gate /*
35437c478bd9Sstevel@tonic-gate * This subroutine adds the data at next_in/avail_in to the output history
35447c478bd9Sstevel@tonic-gate * without performing any output. The output buffer must be "caught up";
35457c478bd9Sstevel@tonic-gate * i.e. no pending output (hence s->read equals s->write), and the state must
35467c478bd9Sstevel@tonic-gate * be BLOCKS (i.e. we should be willing to see the start of a series of
35477c478bd9Sstevel@tonic-gate * BLOCKS). On exit, the output will also be caught up, and the checksum
35487c478bd9Sstevel@tonic-gate * will have been updated if need be.
35497c478bd9Sstevel@tonic-gate */
inflate_addhistory(s,z)35507c478bd9Sstevel@tonic-gate local int inflate_addhistory(s, z)
35517c478bd9Sstevel@tonic-gate inflate_blocks_statef *s;
35527c478bd9Sstevel@tonic-gate z_stream *z;
35537c478bd9Sstevel@tonic-gate {
35547c478bd9Sstevel@tonic-gate uLong b; /* bit buffer */ /* NOT USED HERE */
35557c478bd9Sstevel@tonic-gate uInt k; /* bits in bit buffer */ /* NOT USED HERE */
35567c478bd9Sstevel@tonic-gate uInt t; /* temporary storage */
35577c478bd9Sstevel@tonic-gate Bytef *p; /* input data pointer */
35587c478bd9Sstevel@tonic-gate uInt n; /* bytes available there */
35597c478bd9Sstevel@tonic-gate Bytef *q; /* output window write pointer */
35607c478bd9Sstevel@tonic-gate uInt m; /* bytes to end of window or read pointer */
35617c478bd9Sstevel@tonic-gate
35627c478bd9Sstevel@tonic-gate if (s->read != s->write)
35637c478bd9Sstevel@tonic-gate return Z_STREAM_ERROR;
35647c478bd9Sstevel@tonic-gate if (s->mode != TYPE)
35657c478bd9Sstevel@tonic-gate return Z_DATA_ERROR;
35667c478bd9Sstevel@tonic-gate
35677c478bd9Sstevel@tonic-gate /* we're ready to rock */
35687c478bd9Sstevel@tonic-gate LOAD
35697c478bd9Sstevel@tonic-gate /* while there is input ready, copy to output buffer, moving
35707c478bd9Sstevel@tonic-gate * pointers as needed.
35717c478bd9Sstevel@tonic-gate */
35727c478bd9Sstevel@tonic-gate while (n) {
35737c478bd9Sstevel@tonic-gate t = n; /* how many to do */
35747c478bd9Sstevel@tonic-gate /* is there room until end of buffer? */
35757c478bd9Sstevel@tonic-gate if (t > m) t = m;
35767c478bd9Sstevel@tonic-gate /* update check information */
35777c478bd9Sstevel@tonic-gate if (s->checkfn != Z_NULL)
35787c478bd9Sstevel@tonic-gate s->check = (*s->checkfn)(s->check, q, t);
35797c478bd9Sstevel@tonic-gate zmemcpy(q, p, t);
35807c478bd9Sstevel@tonic-gate q += t;
35817c478bd9Sstevel@tonic-gate p += t;
35827c478bd9Sstevel@tonic-gate n -= t;
35837c478bd9Sstevel@tonic-gate z->total_out += t;
35847c478bd9Sstevel@tonic-gate s->read = q; /* drag read pointer forward */
35857c478bd9Sstevel@tonic-gate /* WRAP */ /* expand WRAP macro by hand to handle s->read */
35867c478bd9Sstevel@tonic-gate if (q == s->end) {
35877c478bd9Sstevel@tonic-gate s->read = q = s->window;
35887c478bd9Sstevel@tonic-gate m = WAVAIL;
35897c478bd9Sstevel@tonic-gate }
35907c478bd9Sstevel@tonic-gate }
35917c478bd9Sstevel@tonic-gate UPDATE
35927c478bd9Sstevel@tonic-gate return Z_OK;
35937c478bd9Sstevel@tonic-gate }
35947c478bd9Sstevel@tonic-gate
35957c478bd9Sstevel@tonic-gate
35967c478bd9Sstevel@tonic-gate /*
35977c478bd9Sstevel@tonic-gate * At the end of a Deflate-compressed PPP packet, we expect to have seen
35987c478bd9Sstevel@tonic-gate * a `stored' block type value but not the (zero) length bytes.
35997c478bd9Sstevel@tonic-gate */
inflate_packet_flush(s)36007c478bd9Sstevel@tonic-gate local int inflate_packet_flush(s)
36017c478bd9Sstevel@tonic-gate inflate_blocks_statef *s;
36027c478bd9Sstevel@tonic-gate {
36037c478bd9Sstevel@tonic-gate if (s->mode != LENS)
36047c478bd9Sstevel@tonic-gate return Z_DATA_ERROR;
36057c478bd9Sstevel@tonic-gate s->mode = TYPE;
36067c478bd9Sstevel@tonic-gate return Z_OK;
36077c478bd9Sstevel@tonic-gate }
36087c478bd9Sstevel@tonic-gate
36097c478bd9Sstevel@tonic-gate
36107c478bd9Sstevel@tonic-gate /*+++++*/
36117c478bd9Sstevel@tonic-gate /* inftrees.c -- generate Huffman trees for efficient decoding
36127c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
3613*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
36147c478bd9Sstevel@tonic-gate */
36157c478bd9Sstevel@tonic-gate
36167c478bd9Sstevel@tonic-gate /* simplify the use of the inflate_huft type with some defines */
36177c478bd9Sstevel@tonic-gate #define base more.Base
36187c478bd9Sstevel@tonic-gate #define next more.Next
36197c478bd9Sstevel@tonic-gate #define exop word.what.Exop
36207c478bd9Sstevel@tonic-gate #define bits word.what.Bits
36217c478bd9Sstevel@tonic-gate
36227c478bd9Sstevel@tonic-gate
36237c478bd9Sstevel@tonic-gate local int huft_build OF((
36247c478bd9Sstevel@tonic-gate uIntf *, /* code lengths in bits */
36257c478bd9Sstevel@tonic-gate uInt, /* number of codes */
36267c478bd9Sstevel@tonic-gate uInt, /* number of "simple" codes */
36277c478bd9Sstevel@tonic-gate uIntf *, /* list of base values for non-simple codes */
36287c478bd9Sstevel@tonic-gate uIntf *, /* list of extra bits for non-simple codes */
36297c478bd9Sstevel@tonic-gate inflate_huft * FAR*,/* result: starting table */
36307c478bd9Sstevel@tonic-gate uIntf *, /* maximum lookup bits (returns actual) */
36317c478bd9Sstevel@tonic-gate z_stream *)); /* for zalloc function */
36327c478bd9Sstevel@tonic-gate
36337c478bd9Sstevel@tonic-gate local voidpf falloc OF((
36347c478bd9Sstevel@tonic-gate voidpf, /* opaque pointer (not used) */
36357c478bd9Sstevel@tonic-gate uInt, /* number of items */
36367c478bd9Sstevel@tonic-gate uInt)); /* size of item */
36377c478bd9Sstevel@tonic-gate
36387c478bd9Sstevel@tonic-gate local void ffree OF((
36397c478bd9Sstevel@tonic-gate voidpf q, /* opaque pointer (not used) */
36407c478bd9Sstevel@tonic-gate voidpf p, /* what to free (not used) */
36417c478bd9Sstevel@tonic-gate uInt n)); /* number of bytes (not used) */
36427c478bd9Sstevel@tonic-gate
36437c478bd9Sstevel@tonic-gate /* Tables for deflate from PKZIP's appnote.txt. */
36447c478bd9Sstevel@tonic-gate local uInt cplens[] = { /* Copy lengths for literal codes 257..285 */
36457c478bd9Sstevel@tonic-gate 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
36467c478bd9Sstevel@tonic-gate 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
36477c478bd9Sstevel@tonic-gate /* actually lengths - 2; also see note #13 above about 258 */
36487c478bd9Sstevel@tonic-gate local uInt cplext[] = { /* Extra bits for literal codes 257..285 */
36497c478bd9Sstevel@tonic-gate 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
36507c478bd9Sstevel@tonic-gate 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 192, 192}; /* 192==invalid */
36517c478bd9Sstevel@tonic-gate local uInt cpdist[] = { /* Copy offsets for distance codes 0..29 */
36527c478bd9Sstevel@tonic-gate 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
36537c478bd9Sstevel@tonic-gate 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
36547c478bd9Sstevel@tonic-gate 8193, 12289, 16385, 24577};
36557c478bd9Sstevel@tonic-gate local uInt cpdext[] = { /* Extra bits for distance codes */
36567c478bd9Sstevel@tonic-gate 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
36577c478bd9Sstevel@tonic-gate 7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
36587c478bd9Sstevel@tonic-gate 12, 12, 13, 13};
36597c478bd9Sstevel@tonic-gate
36607c478bd9Sstevel@tonic-gate /*
36617c478bd9Sstevel@tonic-gate Huffman code decoding is performed using a multi-level table lookup.
36627c478bd9Sstevel@tonic-gate The fastest way to decode is to simply build a lookup table whose
36637c478bd9Sstevel@tonic-gate size is determined by the longest code. However, the time it takes
36647c478bd9Sstevel@tonic-gate to build this table can also be a factor if the data being decoded
36657c478bd9Sstevel@tonic-gate is not very long. The most common codes are necessarily the
36667c478bd9Sstevel@tonic-gate shortest codes, so those codes dominate the decoding time, and hence
36677c478bd9Sstevel@tonic-gate the speed. The idea is you can have a shorter table that decodes the
36687c478bd9Sstevel@tonic-gate shorter, more probable codes, and then point to subsidiary tables for
36697c478bd9Sstevel@tonic-gate the longer codes. The time it costs to decode the longer codes is
36707c478bd9Sstevel@tonic-gate then traded against the time it takes to make longer tables.
36717c478bd9Sstevel@tonic-gate
36727c478bd9Sstevel@tonic-gate This results of this trade are in the variables lbits and dbits
36737c478bd9Sstevel@tonic-gate below. lbits is the number of bits the first level table for literal/
36747c478bd9Sstevel@tonic-gate length codes can decode in one step, and dbits is the same thing for
36757c478bd9Sstevel@tonic-gate the distance codes. Subsequent tables are also less than or equal to
36767c478bd9Sstevel@tonic-gate those sizes. These values may be adjusted either when all of the
36777c478bd9Sstevel@tonic-gate codes are shorter than that, in which case the longest code length in
36787c478bd9Sstevel@tonic-gate bits is used, or when the shortest code is *longer* than the requested
36797c478bd9Sstevel@tonic-gate table size, in which case the length of the shortest code in bits is
36807c478bd9Sstevel@tonic-gate used.
36817c478bd9Sstevel@tonic-gate
36827c478bd9Sstevel@tonic-gate There are two different values for the two tables, since they code a
36837c478bd9Sstevel@tonic-gate different number of possibilities each. The literal/length table
36847c478bd9Sstevel@tonic-gate codes 286 possible values, or in a flat code, a little over eight
36857c478bd9Sstevel@tonic-gate bits. The distance table codes 30 possible values, or a little less
36867c478bd9Sstevel@tonic-gate than five bits, flat. The optimum values for speed end up being
36877c478bd9Sstevel@tonic-gate about one bit more than those, so lbits is 8+1 and dbits is 5+1.
36887c478bd9Sstevel@tonic-gate The optimum values may differ though from machine to machine, and
36897c478bd9Sstevel@tonic-gate possibly even between compilers. Your mileage may vary.
36907c478bd9Sstevel@tonic-gate */
36917c478bd9Sstevel@tonic-gate
36927c478bd9Sstevel@tonic-gate
36937c478bd9Sstevel@tonic-gate /* If BMAX needs to be larger than 16, then h and x[] should be uLong. */
36947c478bd9Sstevel@tonic-gate #define BMAX 15 /* maximum bit length of any code */
36957c478bd9Sstevel@tonic-gate #define N_MAX 288 /* maximum number of codes in any set */
36967c478bd9Sstevel@tonic-gate
36977c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
36987c478bd9Sstevel@tonic-gate uInt inflate_hufts;
36997c478bd9Sstevel@tonic-gate #endif
37007c478bd9Sstevel@tonic-gate
huft_build(b,n,s,d,e,t,m,zs)37017c478bd9Sstevel@tonic-gate local int huft_build(b, n, s, d, e, t, m, zs)
37027c478bd9Sstevel@tonic-gate uIntf *b; /* code lengths in bits (all assumed <= BMAX) */
37037c478bd9Sstevel@tonic-gate uInt n; /* number of codes (assumed <= N_MAX) */
37047c478bd9Sstevel@tonic-gate uInt s; /* number of simple-valued codes (0..s-1) */
37057c478bd9Sstevel@tonic-gate uIntf *d; /* list of base values for non-simple codes */
3706*55fea89dSDan Cross uIntf *e; /* list of extra bits for non-simple codes */
37077c478bd9Sstevel@tonic-gate inflate_huft * FAR *t; /* result: starting table */
37087c478bd9Sstevel@tonic-gate uIntf *m; /* maximum lookup bits, returns actual */
37097c478bd9Sstevel@tonic-gate z_stream *zs; /* for zalloc function */
37107c478bd9Sstevel@tonic-gate /* Given a list of code lengths and a maximum table size, make a set of
37117c478bd9Sstevel@tonic-gate tables to decode that set of codes. Return Z_OK on success, Z_BUF_ERROR
37127c478bd9Sstevel@tonic-gate if the given code set is incomplete (the tables are still built in this
37137c478bd9Sstevel@tonic-gate case), Z_DATA_ERROR if the input is invalid (all zero length codes or an
37147c478bd9Sstevel@tonic-gate over-subscribed set of lengths), or Z_MEM_ERROR if not enough memory. */
37157c478bd9Sstevel@tonic-gate {
37167c478bd9Sstevel@tonic-gate
37177c478bd9Sstevel@tonic-gate uInt a; /* counter for codes of length k */
37187c478bd9Sstevel@tonic-gate uInt c[BMAX+1]; /* bit length count table */
37197c478bd9Sstevel@tonic-gate uInt f; /* i repeats in table every f entries */
37207c478bd9Sstevel@tonic-gate int g; /* maximum code length */
37217c478bd9Sstevel@tonic-gate int h; /* table level */
37227c478bd9Sstevel@tonic-gate register uInt i; /* counter, current code */
37237c478bd9Sstevel@tonic-gate register uInt j; /* counter */
37247c478bd9Sstevel@tonic-gate register int k; /* number of bits in current code */
37257c478bd9Sstevel@tonic-gate int l; /* bits per table (returned in m) */
37267c478bd9Sstevel@tonic-gate register uIntf *p; /* pointer into c[], b[], or v[] */
37277c478bd9Sstevel@tonic-gate inflate_huft *q; /* points to current table */
37287c478bd9Sstevel@tonic-gate struct inflate_huft_s r; /* table entry for structure assignment */
37297c478bd9Sstevel@tonic-gate inflate_huft *u[BMAX]; /* table stack */
37307c478bd9Sstevel@tonic-gate uInt v[N_MAX]; /* values in order of bit length */
37317c478bd9Sstevel@tonic-gate register int w; /* bits before this table == (l * h) */
37327c478bd9Sstevel@tonic-gate uInt x[BMAX+1]; /* bit offsets, then code stack */
37337c478bd9Sstevel@tonic-gate uIntf *xp; /* pointer into x */
37347c478bd9Sstevel@tonic-gate int y; /* number of dummy codes added */
37357c478bd9Sstevel@tonic-gate uInt z; /* number of entries in current table */
37367c478bd9Sstevel@tonic-gate
37377c478bd9Sstevel@tonic-gate
37387c478bd9Sstevel@tonic-gate /* Generate counts for each bit length */
37397c478bd9Sstevel@tonic-gate p = c;
37407c478bd9Sstevel@tonic-gate #define C0 *p++ = 0;
37417c478bd9Sstevel@tonic-gate #define C2 C0 C0 C0 C0
37427c478bd9Sstevel@tonic-gate #define C4 C2 C2 C2 C2
37437c478bd9Sstevel@tonic-gate C4 /* clear c[]--assume BMAX+1 is 16 */
37447c478bd9Sstevel@tonic-gate p = b; i = n;
37457c478bd9Sstevel@tonic-gate do {
37467c478bd9Sstevel@tonic-gate c[*p++]++; /* assume all entries <= BMAX */
37477c478bd9Sstevel@tonic-gate } while (--i);
37487c478bd9Sstevel@tonic-gate if (c[0] == n) /* null input--all zero length codes */
37497c478bd9Sstevel@tonic-gate {
37507c478bd9Sstevel@tonic-gate *t = (inflate_huft *)Z_NULL;
37517c478bd9Sstevel@tonic-gate *m = 0;
37527c478bd9Sstevel@tonic-gate return Z_OK;
37537c478bd9Sstevel@tonic-gate }
37547c478bd9Sstevel@tonic-gate
37557c478bd9Sstevel@tonic-gate
37567c478bd9Sstevel@tonic-gate /* Find minimum and maximum length, bound *m by those */
37577c478bd9Sstevel@tonic-gate l = *m;
37587c478bd9Sstevel@tonic-gate for (j = 1; j <= BMAX; j++)
37597c478bd9Sstevel@tonic-gate if (c[j])
37607c478bd9Sstevel@tonic-gate break;
37617c478bd9Sstevel@tonic-gate k = j; /* minimum code length */
37627c478bd9Sstevel@tonic-gate if ((uInt)l < j)
37637c478bd9Sstevel@tonic-gate l = j;
37647c478bd9Sstevel@tonic-gate for (i = BMAX; i; i--)
37657c478bd9Sstevel@tonic-gate if (c[i])
37667c478bd9Sstevel@tonic-gate break;
37677c478bd9Sstevel@tonic-gate g = i; /* maximum code length */
37687c478bd9Sstevel@tonic-gate if ((uInt)l > i)
37697c478bd9Sstevel@tonic-gate l = i;
37707c478bd9Sstevel@tonic-gate *m = l;
37717c478bd9Sstevel@tonic-gate
37727c478bd9Sstevel@tonic-gate
37737c478bd9Sstevel@tonic-gate /* Adjust last length count to fill out codes, if needed */
37747c478bd9Sstevel@tonic-gate for (y = 1 << j; j < i; j++, y <<= 1)
37757c478bd9Sstevel@tonic-gate if ((y -= c[j]) < 0)
37767c478bd9Sstevel@tonic-gate return Z_DATA_ERROR;
37777c478bd9Sstevel@tonic-gate if ((y -= c[i]) < 0)
37787c478bd9Sstevel@tonic-gate return Z_DATA_ERROR;
37797c478bd9Sstevel@tonic-gate c[i] += y;
37807c478bd9Sstevel@tonic-gate
37817c478bd9Sstevel@tonic-gate
37827c478bd9Sstevel@tonic-gate /* Generate starting offsets into the value table for each length */
37837c478bd9Sstevel@tonic-gate x[1] = j = 0;
37847c478bd9Sstevel@tonic-gate p = c + 1; xp = x + 2;
37857c478bd9Sstevel@tonic-gate while (--i) { /* note that i == g from above */
37867c478bd9Sstevel@tonic-gate *xp++ = (j += *p++);
37877c478bd9Sstevel@tonic-gate }
37887c478bd9Sstevel@tonic-gate
37897c478bd9Sstevel@tonic-gate
37907c478bd9Sstevel@tonic-gate /* Make a table of values in order of bit lengths */
37917c478bd9Sstevel@tonic-gate p = b; i = 0;
37927c478bd9Sstevel@tonic-gate do {
37937c478bd9Sstevel@tonic-gate if ((j = *p++) != 0)
37947c478bd9Sstevel@tonic-gate v[x[j]++] = i;
37957c478bd9Sstevel@tonic-gate } while (++i < n);
37967c478bd9Sstevel@tonic-gate
37977c478bd9Sstevel@tonic-gate
37987c478bd9Sstevel@tonic-gate /* Generate the Huffman codes and for each, make the table entries */
37997c478bd9Sstevel@tonic-gate x[0] = i = 0; /* first Huffman code is zero */
38007c478bd9Sstevel@tonic-gate p = v; /* grab values in bit order */
38017c478bd9Sstevel@tonic-gate h = -1; /* no tables yet--level -1 */
38027c478bd9Sstevel@tonic-gate w = -l; /* bits decoded == (l * h) */
38037c478bd9Sstevel@tonic-gate u[0] = (inflate_huft *)Z_NULL; /* just to keep compilers happy */
38047c478bd9Sstevel@tonic-gate q = (inflate_huft *)Z_NULL; /* ditto */
38057c478bd9Sstevel@tonic-gate z = 0; /* ditto */
38067c478bd9Sstevel@tonic-gate
38077c478bd9Sstevel@tonic-gate /* go through the bit lengths (k already is bits in shortest code) */
38087c478bd9Sstevel@tonic-gate for (; k <= g; k++)
38097c478bd9Sstevel@tonic-gate {
38107c478bd9Sstevel@tonic-gate a = c[k];
38117c478bd9Sstevel@tonic-gate while (a--)
38127c478bd9Sstevel@tonic-gate {
38137c478bd9Sstevel@tonic-gate /* here i is the Huffman code of length k bits for value *p */
38147c478bd9Sstevel@tonic-gate /* make tables up to required level */
38157c478bd9Sstevel@tonic-gate while (k > w + l)
38167c478bd9Sstevel@tonic-gate {
38177c478bd9Sstevel@tonic-gate h++;
38187c478bd9Sstevel@tonic-gate w += l; /* previous table always l bits */
38197c478bd9Sstevel@tonic-gate
38207c478bd9Sstevel@tonic-gate /* compute minimum size table less than or equal to l bits */
38217c478bd9Sstevel@tonic-gate z = (z = g - w) > (uInt)l ? l : z; /* table size upper limit */
38227c478bd9Sstevel@tonic-gate if ((f = 1 << (j = k - w)) > a + 1) /* try a k-w bit table */
38237c478bd9Sstevel@tonic-gate { /* too few codes for k-w bit table */
38247c478bd9Sstevel@tonic-gate f -= a + 1; /* deduct codes from patterns left */
38257c478bd9Sstevel@tonic-gate xp = c + k;
38267c478bd9Sstevel@tonic-gate if (j < z)
38277c478bd9Sstevel@tonic-gate while (++j < z) /* try smaller tables up to z bits */
38287c478bd9Sstevel@tonic-gate {
38297c478bd9Sstevel@tonic-gate if ((f <<= 1) <= *++xp)
38307c478bd9Sstevel@tonic-gate break; /* enough codes to use up j bits */
38317c478bd9Sstevel@tonic-gate f -= *xp; /* else deduct codes from patterns */
38327c478bd9Sstevel@tonic-gate }
38337c478bd9Sstevel@tonic-gate }
38347c478bd9Sstevel@tonic-gate z = 1 << j; /* table entries for j-bit table */
38357c478bd9Sstevel@tonic-gate
38367c478bd9Sstevel@tonic-gate /* allocate and link in new table */
38377c478bd9Sstevel@tonic-gate if ((q = (inflate_huft *)ZALLOC
38387c478bd9Sstevel@tonic-gate (zs,z + 1,sizeof(inflate_huft))) == Z_NULL)
38397c478bd9Sstevel@tonic-gate {
38407c478bd9Sstevel@tonic-gate if (h)
38417c478bd9Sstevel@tonic-gate inflate_trees_free(u[0], zs);
38427c478bd9Sstevel@tonic-gate return Z_MEM_ERROR; /* not enough memory */
38437c478bd9Sstevel@tonic-gate }
38447c478bd9Sstevel@tonic-gate q->word.Nalloc = z + 1;
38457c478bd9Sstevel@tonic-gate #ifdef DEBUG_ZLIB
38467c478bd9Sstevel@tonic-gate inflate_hufts += z + 1;
38477c478bd9Sstevel@tonic-gate #endif
38487c478bd9Sstevel@tonic-gate *t = q + 1; /* link to list for huft_free() */
38497c478bd9Sstevel@tonic-gate *(t = &(q->next)) = Z_NULL;
38507c478bd9Sstevel@tonic-gate u[h] = ++q; /* table starts after link */
38517c478bd9Sstevel@tonic-gate
38527c478bd9Sstevel@tonic-gate /* connect to last table, if there is one */
38537c478bd9Sstevel@tonic-gate if (h)
38547c478bd9Sstevel@tonic-gate {
38557c478bd9Sstevel@tonic-gate x[h] = i; /* save pattern for backing up */
38567c478bd9Sstevel@tonic-gate r.bits = (Byte)l; /* bits to dump before this table */
38577c478bd9Sstevel@tonic-gate r.exop = (Byte)j; /* bits in this table */
38587c478bd9Sstevel@tonic-gate r.next = q; /* pointer to this table */
38597c478bd9Sstevel@tonic-gate j = i >> (w - l); /* (get around Turbo C bug) */
38607c478bd9Sstevel@tonic-gate u[h-1][j] = r; /* connect to last table */
38617c478bd9Sstevel@tonic-gate }
38627c478bd9Sstevel@tonic-gate }
38637c478bd9Sstevel@tonic-gate
38647c478bd9Sstevel@tonic-gate /* set up table entry in r */
38657c478bd9Sstevel@tonic-gate r.bits = (Byte)(k - w);
38667c478bd9Sstevel@tonic-gate if (p >= v + n)
38677c478bd9Sstevel@tonic-gate r.exop = 128 + 64; /* out of values--invalid code */
38687c478bd9Sstevel@tonic-gate else if (*p < s)
38697c478bd9Sstevel@tonic-gate {
38707c478bd9Sstevel@tonic-gate r.exop = (Byte)(*p < 256 ? 0 : 32 + 64); /* 256 is end-of-block */
38717c478bd9Sstevel@tonic-gate r.base = *p++; /* simple code is just the value */
38727c478bd9Sstevel@tonic-gate }
38737c478bd9Sstevel@tonic-gate else
38747c478bd9Sstevel@tonic-gate {
38757c478bd9Sstevel@tonic-gate r.exop = (Byte)e[*p - s] + 16 + 64; /* non-simple--look up in lists */
38767c478bd9Sstevel@tonic-gate r.base = d[*p++ - s];
38777c478bd9Sstevel@tonic-gate }
38787c478bd9Sstevel@tonic-gate
38797c478bd9Sstevel@tonic-gate /* fill code-like entries with r */
38807c478bd9Sstevel@tonic-gate f = 1 << (k - w);
38817c478bd9Sstevel@tonic-gate for (j = i >> w; j < z; j += f)
38827c478bd9Sstevel@tonic-gate q[j] = r;
38837c478bd9Sstevel@tonic-gate
38847c478bd9Sstevel@tonic-gate /* backwards increment the k-bit code i */
38857c478bd9Sstevel@tonic-gate for (j = 1 << (k - 1); i & j; j >>= 1)
38867c478bd9Sstevel@tonic-gate i ^= j;
38877c478bd9Sstevel@tonic-gate i ^= j;
38887c478bd9Sstevel@tonic-gate
38897c478bd9Sstevel@tonic-gate /* backup over finished tables */
38907c478bd9Sstevel@tonic-gate while ((i & ((1 << w) - 1)) != x[h])
38917c478bd9Sstevel@tonic-gate {
38927c478bd9Sstevel@tonic-gate h--; /* don't need to update q */
38937c478bd9Sstevel@tonic-gate w -= l;
38947c478bd9Sstevel@tonic-gate }
38957c478bd9Sstevel@tonic-gate }
38967c478bd9Sstevel@tonic-gate }
38977c478bd9Sstevel@tonic-gate
38987c478bd9Sstevel@tonic-gate
38997c478bd9Sstevel@tonic-gate /* Return Z_BUF_ERROR if we were given an incomplete table */
39007c478bd9Sstevel@tonic-gate return y != 0 && g != 1 ? Z_BUF_ERROR : Z_OK;
39017c478bd9Sstevel@tonic-gate }
39027c478bd9Sstevel@tonic-gate
39037c478bd9Sstevel@tonic-gate
inflate_trees_bits(c,bb,tb,z)39047c478bd9Sstevel@tonic-gate local int inflate_trees_bits(c, bb, tb, z)
39057c478bd9Sstevel@tonic-gate uIntf *c; /* 19 code lengths */
39067c478bd9Sstevel@tonic-gate uIntf *bb; /* bits tree desired/actual depth */
39077c478bd9Sstevel@tonic-gate inflate_huft * FAR *tb; /* bits tree result */
39087c478bd9Sstevel@tonic-gate z_stream *z; /* for zfree function */
39097c478bd9Sstevel@tonic-gate {
39107c478bd9Sstevel@tonic-gate int r;
39117c478bd9Sstevel@tonic-gate
39127c478bd9Sstevel@tonic-gate r = huft_build(c, 19, 19, (uIntf*)Z_NULL, (uIntf*)Z_NULL, tb, bb, z);
39137c478bd9Sstevel@tonic-gate if (r == Z_DATA_ERROR)
39147c478bd9Sstevel@tonic-gate z->msg = "oversubscribed dynamic bit lengths tree";
39157c478bd9Sstevel@tonic-gate else if (r == Z_BUF_ERROR)
39167c478bd9Sstevel@tonic-gate {
39177c478bd9Sstevel@tonic-gate inflate_trees_free(*tb, z);
39187c478bd9Sstevel@tonic-gate z->msg = "incomplete dynamic bit lengths tree";
39197c478bd9Sstevel@tonic-gate r = Z_DATA_ERROR;
39207c478bd9Sstevel@tonic-gate }
39217c478bd9Sstevel@tonic-gate return r;
39227c478bd9Sstevel@tonic-gate }
39237c478bd9Sstevel@tonic-gate
39247c478bd9Sstevel@tonic-gate
inflate_trees_dynamic(nl,nd,c,bl,bd,tl,td,z)39257c478bd9Sstevel@tonic-gate local int inflate_trees_dynamic(nl, nd, c, bl, bd, tl, td, z)
39267c478bd9Sstevel@tonic-gate uInt nl; /* number of literal/length codes */
39277c478bd9Sstevel@tonic-gate uInt nd; /* number of distance codes */
39287c478bd9Sstevel@tonic-gate uIntf *c; /* that many (total) code lengths */
39297c478bd9Sstevel@tonic-gate uIntf *bl; /* literal desired/actual bit depth */
39307c478bd9Sstevel@tonic-gate uIntf *bd; /* distance desired/actual bit depth */
39317c478bd9Sstevel@tonic-gate inflate_huft * FAR *tl; /* literal/length tree result */
39327c478bd9Sstevel@tonic-gate inflate_huft * FAR *td; /* distance tree result */
39337c478bd9Sstevel@tonic-gate z_stream *z; /* for zfree function */
39347c478bd9Sstevel@tonic-gate {
39357c478bd9Sstevel@tonic-gate int r;
39367c478bd9Sstevel@tonic-gate
39377c478bd9Sstevel@tonic-gate /* build literal/length tree */
39387c478bd9Sstevel@tonic-gate if ((r = huft_build(c, nl, 257, cplens, cplext, tl, bl, z)) != Z_OK)
39397c478bd9Sstevel@tonic-gate {
39407c478bd9Sstevel@tonic-gate if (r == Z_DATA_ERROR)
39417c478bd9Sstevel@tonic-gate z->msg = "oversubscribed literal/length tree";
39427c478bd9Sstevel@tonic-gate else if (r == Z_BUF_ERROR)
39437c478bd9Sstevel@tonic-gate {
39447c478bd9Sstevel@tonic-gate inflate_trees_free(*tl, z);
39457c478bd9Sstevel@tonic-gate z->msg = "incomplete literal/length tree";
39467c478bd9Sstevel@tonic-gate r = Z_DATA_ERROR;
39477c478bd9Sstevel@tonic-gate }
39487c478bd9Sstevel@tonic-gate return r;
39497c478bd9Sstevel@tonic-gate }
39507c478bd9Sstevel@tonic-gate
39517c478bd9Sstevel@tonic-gate /* build distance tree */
39527c478bd9Sstevel@tonic-gate if ((r = huft_build(c + nl, nd, 0, cpdist, cpdext, td, bd, z)) != Z_OK)
39537c478bd9Sstevel@tonic-gate {
39547c478bd9Sstevel@tonic-gate if (r == Z_DATA_ERROR)
39557c478bd9Sstevel@tonic-gate z->msg = "oversubscribed literal/length tree";
39567c478bd9Sstevel@tonic-gate else if (r == Z_BUF_ERROR) {
39577c478bd9Sstevel@tonic-gate #ifdef PKZIP_BUG_WORKAROUND
39587c478bd9Sstevel@tonic-gate r = Z_OK;
39597c478bd9Sstevel@tonic-gate }
39607c478bd9Sstevel@tonic-gate #else
39617c478bd9Sstevel@tonic-gate inflate_trees_free(*td, z);
39627c478bd9Sstevel@tonic-gate z->msg = "incomplete literal/length tree";
39637c478bd9Sstevel@tonic-gate r = Z_DATA_ERROR;
39647c478bd9Sstevel@tonic-gate }
39657c478bd9Sstevel@tonic-gate inflate_trees_free(*tl, z);
39667c478bd9Sstevel@tonic-gate return r;
39677c478bd9Sstevel@tonic-gate #endif
39687c478bd9Sstevel@tonic-gate }
39697c478bd9Sstevel@tonic-gate
39707c478bd9Sstevel@tonic-gate /* done */
39717c478bd9Sstevel@tonic-gate return Z_OK;
39727c478bd9Sstevel@tonic-gate }
39737c478bd9Sstevel@tonic-gate
39747c478bd9Sstevel@tonic-gate
39757c478bd9Sstevel@tonic-gate /* build fixed tables only once--keep them here */
39767c478bd9Sstevel@tonic-gate local int fixed_lock = 0;
39777c478bd9Sstevel@tonic-gate local int fixed_built = 0;
39787c478bd9Sstevel@tonic-gate #define FIXEDH 530 /* number of hufts used by fixed tables */
39797c478bd9Sstevel@tonic-gate local uInt fixed_left = FIXEDH;
39807c478bd9Sstevel@tonic-gate local inflate_huft fixed_mem[FIXEDH];
39817c478bd9Sstevel@tonic-gate local uInt fixed_bl;
39827c478bd9Sstevel@tonic-gate local uInt fixed_bd;
39837c478bd9Sstevel@tonic-gate local inflate_huft *fixed_tl;
39847c478bd9Sstevel@tonic-gate local inflate_huft *fixed_td;
39857c478bd9Sstevel@tonic-gate
39867c478bd9Sstevel@tonic-gate
falloc(q,n,s)39877c478bd9Sstevel@tonic-gate local voidpf falloc(q, n, s)
39887c478bd9Sstevel@tonic-gate voidpf q; /* opaque pointer (not used) */
39897c478bd9Sstevel@tonic-gate uInt n; /* number of items */
39907c478bd9Sstevel@tonic-gate uInt s; /* size of item */
39917c478bd9Sstevel@tonic-gate {
39927c478bd9Sstevel@tonic-gate Assert(s == sizeof(inflate_huft) && n <= fixed_left,
39937c478bd9Sstevel@tonic-gate "inflate_trees falloc overflow");
39947c478bd9Sstevel@tonic-gate if (q) s++; /* to make some compilers happy */
39957c478bd9Sstevel@tonic-gate fixed_left -= n;
39967c478bd9Sstevel@tonic-gate return (voidpf)(fixed_mem + fixed_left);
39977c478bd9Sstevel@tonic-gate }
39987c478bd9Sstevel@tonic-gate
39997c478bd9Sstevel@tonic-gate
ffree(q,p,n)40007c478bd9Sstevel@tonic-gate local void ffree(q, p, n)
40017c478bd9Sstevel@tonic-gate voidpf q;
40027c478bd9Sstevel@tonic-gate voidpf p;
40037c478bd9Sstevel@tonic-gate uInt n;
40047c478bd9Sstevel@tonic-gate {
40057c478bd9Sstevel@tonic-gate Assert(0, "inflate_trees ffree called!");
40067c478bd9Sstevel@tonic-gate if (q) q = p; /* to make some compilers happy */
40077c478bd9Sstevel@tonic-gate }
40087c478bd9Sstevel@tonic-gate
40097c478bd9Sstevel@tonic-gate
inflate_trees_fixed(bl,bd,tl,td)40107c478bd9Sstevel@tonic-gate local int inflate_trees_fixed(bl, bd, tl, td)
40117c478bd9Sstevel@tonic-gate uIntf *bl; /* literal desired/actual bit depth */
40127c478bd9Sstevel@tonic-gate uIntf *bd; /* distance desired/actual bit depth */
40137c478bd9Sstevel@tonic-gate inflate_huft * FAR *tl; /* literal/length tree result */
40147c478bd9Sstevel@tonic-gate inflate_huft * FAR *td; /* distance tree result */
40157c478bd9Sstevel@tonic-gate {
40167c478bd9Sstevel@tonic-gate /* build fixed tables if not built already--lock out other instances */
40177c478bd9Sstevel@tonic-gate while (++fixed_lock > 1)
40187c478bd9Sstevel@tonic-gate fixed_lock--;
40197c478bd9Sstevel@tonic-gate if (!fixed_built)
40207c478bd9Sstevel@tonic-gate {
40217c478bd9Sstevel@tonic-gate int k; /* temporary variable */
40227c478bd9Sstevel@tonic-gate unsigned c[288]; /* length list for huft_build */
40237c478bd9Sstevel@tonic-gate z_stream z; /* for falloc function */
40247c478bd9Sstevel@tonic-gate
40257c478bd9Sstevel@tonic-gate /* set up fake z_stream for memory routines */
40267c478bd9Sstevel@tonic-gate z.zalloc = falloc;
40277c478bd9Sstevel@tonic-gate z.zfree = ffree;
40287c478bd9Sstevel@tonic-gate z.opaque = Z_NULL;
40297c478bd9Sstevel@tonic-gate
40307c478bd9Sstevel@tonic-gate /* literal table */
40317c478bd9Sstevel@tonic-gate for (k = 0; k < 144; k++)
40327c478bd9Sstevel@tonic-gate c[k] = 8;
40337c478bd9Sstevel@tonic-gate for (; k < 256; k++)
40347c478bd9Sstevel@tonic-gate c[k] = 9;
40357c478bd9Sstevel@tonic-gate for (; k < 280; k++)
40367c478bd9Sstevel@tonic-gate c[k] = 7;
40377c478bd9Sstevel@tonic-gate for (; k < 288; k++)
40387c478bd9Sstevel@tonic-gate c[k] = 8;
40397c478bd9Sstevel@tonic-gate fixed_bl = 7;
40407c478bd9Sstevel@tonic-gate huft_build(c, 288, 257, cplens, cplext, &fixed_tl, &fixed_bl, &z);
40417c478bd9Sstevel@tonic-gate
40427c478bd9Sstevel@tonic-gate /* distance table */
40437c478bd9Sstevel@tonic-gate for (k = 0; k < 30; k++)
40447c478bd9Sstevel@tonic-gate c[k] = 5;
40457c478bd9Sstevel@tonic-gate fixed_bd = 5;
40467c478bd9Sstevel@tonic-gate huft_build(c, 30, 0, cpdist, cpdext, &fixed_td, &fixed_bd, &z);
40477c478bd9Sstevel@tonic-gate
40487c478bd9Sstevel@tonic-gate /* done */
40497c478bd9Sstevel@tonic-gate fixed_built = 1;
40507c478bd9Sstevel@tonic-gate }
40517c478bd9Sstevel@tonic-gate fixed_lock--;
40527c478bd9Sstevel@tonic-gate *bl = fixed_bl;
40537c478bd9Sstevel@tonic-gate *bd = fixed_bd;
40547c478bd9Sstevel@tonic-gate *tl = fixed_tl;
40557c478bd9Sstevel@tonic-gate *td = fixed_td;
40567c478bd9Sstevel@tonic-gate return Z_OK;
40577c478bd9Sstevel@tonic-gate }
40587c478bd9Sstevel@tonic-gate
40597c478bd9Sstevel@tonic-gate
inflate_trees_free(t,z)40607c478bd9Sstevel@tonic-gate local int inflate_trees_free(t, z)
40617c478bd9Sstevel@tonic-gate inflate_huft *t; /* table to free */
40627c478bd9Sstevel@tonic-gate z_stream *z; /* for zfree function */
40637c478bd9Sstevel@tonic-gate /* Free the malloc'ed tables built by huft_build(), which makes a linked
40647c478bd9Sstevel@tonic-gate list of the tables it made, with the links in a dummy first entry of
40657c478bd9Sstevel@tonic-gate each table. */
40667c478bd9Sstevel@tonic-gate {
40677c478bd9Sstevel@tonic-gate register inflate_huft *p, *q;
40687c478bd9Sstevel@tonic-gate
40697c478bd9Sstevel@tonic-gate /* Go through linked list, freeing from the malloced (t[-1]) address. */
40707c478bd9Sstevel@tonic-gate p = t;
40717c478bd9Sstevel@tonic-gate while (p != Z_NULL)
40727c478bd9Sstevel@tonic-gate {
40737c478bd9Sstevel@tonic-gate q = (--p)->next;
40747c478bd9Sstevel@tonic-gate ZFREE(z, p, p->word.Nalloc * sizeof(inflate_huft));
40757c478bd9Sstevel@tonic-gate p = q;
4076*55fea89dSDan Cross }
40777c478bd9Sstevel@tonic-gate return Z_OK;
40787c478bd9Sstevel@tonic-gate }
40797c478bd9Sstevel@tonic-gate
40807c478bd9Sstevel@tonic-gate /*+++++*/
40817c478bd9Sstevel@tonic-gate /* infcodes.c -- process literals and length/distance pairs
40827c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
4083*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
40847c478bd9Sstevel@tonic-gate */
40857c478bd9Sstevel@tonic-gate
40867c478bd9Sstevel@tonic-gate /* simplify the use of the inflate_huft type with some defines */
40877c478bd9Sstevel@tonic-gate #define base more.Base
40887c478bd9Sstevel@tonic-gate #define next more.Next
40897c478bd9Sstevel@tonic-gate #define exop word.what.Exop
40907c478bd9Sstevel@tonic-gate #define bits word.what.Bits
40917c478bd9Sstevel@tonic-gate
40927c478bd9Sstevel@tonic-gate /* inflate codes private state */
40937c478bd9Sstevel@tonic-gate struct inflate_codes_state {
40947c478bd9Sstevel@tonic-gate
40957c478bd9Sstevel@tonic-gate /* mode */
40967c478bd9Sstevel@tonic-gate enum { /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
40977c478bd9Sstevel@tonic-gate START, /* x: set up for LEN */
40987c478bd9Sstevel@tonic-gate LEN, /* i: get length/literal/eob next */
40997c478bd9Sstevel@tonic-gate LENEXT, /* i: getting length extra (have base) */
41007c478bd9Sstevel@tonic-gate DIST, /* i: get distance next */
41017c478bd9Sstevel@tonic-gate DISTEXT, /* i: getting distance extra */
41027c478bd9Sstevel@tonic-gate COPY, /* o: copying bytes in window, waiting for space */
41037c478bd9Sstevel@tonic-gate LIT, /* o: got literal, waiting for output space */
41047c478bd9Sstevel@tonic-gate WASH, /* o: got eob, possibly still output waiting */
41057c478bd9Sstevel@tonic-gate END, /* x: got eob and all data flushed */
41067c478bd9Sstevel@tonic-gate BADCODE} /* x: got error */
41077c478bd9Sstevel@tonic-gate mode; /* current inflate_codes mode */
41087c478bd9Sstevel@tonic-gate
41097c478bd9Sstevel@tonic-gate /* mode dependent information */
41107c478bd9Sstevel@tonic-gate uInt len;
41117c478bd9Sstevel@tonic-gate union {
41127c478bd9Sstevel@tonic-gate struct {
41137c478bd9Sstevel@tonic-gate inflate_huft *tree; /* pointer into tree */
41147c478bd9Sstevel@tonic-gate uInt need; /* bits needed */
41157c478bd9Sstevel@tonic-gate } code; /* if LEN or DIST, where in tree */
41167c478bd9Sstevel@tonic-gate uInt lit; /* if LIT, literal */
41177c478bd9Sstevel@tonic-gate struct {
41187c478bd9Sstevel@tonic-gate uInt get; /* bits to get for extra */
41197c478bd9Sstevel@tonic-gate uInt dist; /* distance back to copy from */
41207c478bd9Sstevel@tonic-gate } copy; /* if EXT or COPY, where and how much */
41217c478bd9Sstevel@tonic-gate } sub; /* submode */
41227c478bd9Sstevel@tonic-gate
41237c478bd9Sstevel@tonic-gate /* mode independent information */
41247c478bd9Sstevel@tonic-gate Byte lbits; /* ltree bits decoded per branch */
41257c478bd9Sstevel@tonic-gate Byte dbits; /* dtree bits decoder per branch */
41267c478bd9Sstevel@tonic-gate inflate_huft *ltree; /* literal/length/eob tree */
41277c478bd9Sstevel@tonic-gate inflate_huft *dtree; /* distance tree */
41287c478bd9Sstevel@tonic-gate
41297c478bd9Sstevel@tonic-gate };
41307c478bd9Sstevel@tonic-gate
41317c478bd9Sstevel@tonic-gate
inflate_codes_new(bl,bd,tl,td,z)41327c478bd9Sstevel@tonic-gate local inflate_codes_statef *inflate_codes_new(bl, bd, tl, td, z)
41337c478bd9Sstevel@tonic-gate uInt bl, bd;
41347c478bd9Sstevel@tonic-gate inflate_huft *tl, *td;
41357c478bd9Sstevel@tonic-gate z_stream *z;
41367c478bd9Sstevel@tonic-gate {
41377c478bd9Sstevel@tonic-gate inflate_codes_statef *c;
41387c478bd9Sstevel@tonic-gate
41397c478bd9Sstevel@tonic-gate if ((c = (inflate_codes_statef *)
41407c478bd9Sstevel@tonic-gate ZALLOC(z,1,sizeof(struct inflate_codes_state))) != Z_NULL)
41417c478bd9Sstevel@tonic-gate {
41427c478bd9Sstevel@tonic-gate c->mode = START;
41437c478bd9Sstevel@tonic-gate c->lbits = (Byte)bl;
41447c478bd9Sstevel@tonic-gate c->dbits = (Byte)bd;
41457c478bd9Sstevel@tonic-gate c->ltree = tl;
41467c478bd9Sstevel@tonic-gate c->dtree = td;
41477c478bd9Sstevel@tonic-gate Tracev((stderr, "inflate: codes new\n"));
41487c478bd9Sstevel@tonic-gate }
41497c478bd9Sstevel@tonic-gate return c;
41507c478bd9Sstevel@tonic-gate }
41517c478bd9Sstevel@tonic-gate
41527c478bd9Sstevel@tonic-gate
inflate_codes(s,z,r)41537c478bd9Sstevel@tonic-gate local int inflate_codes(s, z, r)
41547c478bd9Sstevel@tonic-gate inflate_blocks_statef *s;
41557c478bd9Sstevel@tonic-gate z_stream *z;
41567c478bd9Sstevel@tonic-gate int r;
41577c478bd9Sstevel@tonic-gate {
41587c478bd9Sstevel@tonic-gate uInt j; /* temporary storage */
41597c478bd9Sstevel@tonic-gate inflate_huft *t; /* temporary pointer */
41607c478bd9Sstevel@tonic-gate uInt e; /* extra bits or operation */
41617c478bd9Sstevel@tonic-gate uLong b; /* bit buffer */
41627c478bd9Sstevel@tonic-gate uInt k; /* bits in bit buffer */
41637c478bd9Sstevel@tonic-gate Bytef *p; /* input data pointer */
41647c478bd9Sstevel@tonic-gate uInt n; /* bytes available there */
41657c478bd9Sstevel@tonic-gate Bytef *q; /* output window write pointer */
41667c478bd9Sstevel@tonic-gate uInt m; /* bytes to end of window or read pointer */
41677c478bd9Sstevel@tonic-gate Bytef *f; /* pointer to copy strings from */
41687c478bd9Sstevel@tonic-gate inflate_codes_statef *c = s->sub.decode.codes; /* codes state */
41697c478bd9Sstevel@tonic-gate
41707c478bd9Sstevel@tonic-gate /* copy input/output information to locals (UPDATE macro restores) */
41717c478bd9Sstevel@tonic-gate LOAD
41727c478bd9Sstevel@tonic-gate
41737c478bd9Sstevel@tonic-gate /* process input and output based on current state */
41747c478bd9Sstevel@tonic-gate while (1) switch (c->mode)
41757c478bd9Sstevel@tonic-gate { /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
41767c478bd9Sstevel@tonic-gate case START: /* x: set up for LEN */
41777c478bd9Sstevel@tonic-gate #ifndef SLOW
41787c478bd9Sstevel@tonic-gate if (m >= 258 && n >= 10)
41797c478bd9Sstevel@tonic-gate {
41807c478bd9Sstevel@tonic-gate UPDATE
41817c478bd9Sstevel@tonic-gate r = inflate_fast(c->lbits, c->dbits, c->ltree, c->dtree, s, z);
41827c478bd9Sstevel@tonic-gate LOAD
41837c478bd9Sstevel@tonic-gate if (r != Z_OK)
41847c478bd9Sstevel@tonic-gate {
41857c478bd9Sstevel@tonic-gate c->mode = r == Z_STREAM_END ? WASH : BADCODE;
41867c478bd9Sstevel@tonic-gate break;
41877c478bd9Sstevel@tonic-gate }
41887c478bd9Sstevel@tonic-gate }
41897c478bd9Sstevel@tonic-gate #endif /* !SLOW */
41907c478bd9Sstevel@tonic-gate c->sub.code.need = c->lbits;
41917c478bd9Sstevel@tonic-gate c->sub.code.tree = c->ltree;
41927c478bd9Sstevel@tonic-gate c->mode = LEN;
41935b85b345SToomas Soome /* FALLTHROUGH */
41947c478bd9Sstevel@tonic-gate case LEN: /* i: get length/literal/eob next */
41957c478bd9Sstevel@tonic-gate j = c->sub.code.need;
41967c478bd9Sstevel@tonic-gate NEEDBITS(j)
41977c478bd9Sstevel@tonic-gate t = c->sub.code.tree + ((uInt)b & inflate_mask[j]);
41987c478bd9Sstevel@tonic-gate DUMPBITS(t->bits)
41997c478bd9Sstevel@tonic-gate e = (uInt)(t->exop);
42007c478bd9Sstevel@tonic-gate if (e == 0) /* literal */
42017c478bd9Sstevel@tonic-gate {
42027c478bd9Sstevel@tonic-gate c->sub.lit = t->base;
42037c478bd9Sstevel@tonic-gate Tracevv((stderr, t->base >= 0x20 && t->base < 0x7f ?
42047c478bd9Sstevel@tonic-gate "inflate: literal '%c'\n" :
42057c478bd9Sstevel@tonic-gate "inflate: literal 0x%02x\n", t->base));
42067c478bd9Sstevel@tonic-gate c->mode = LIT;
42077c478bd9Sstevel@tonic-gate break;
42087c478bd9Sstevel@tonic-gate }
42097c478bd9Sstevel@tonic-gate if (e & 16) /* length */
42107c478bd9Sstevel@tonic-gate {
42117c478bd9Sstevel@tonic-gate c->sub.copy.get = e & 15;
42127c478bd9Sstevel@tonic-gate c->len = t->base;
42137c478bd9Sstevel@tonic-gate c->mode = LENEXT;
42147c478bd9Sstevel@tonic-gate break;
42157c478bd9Sstevel@tonic-gate }
42167c478bd9Sstevel@tonic-gate if ((e & 64) == 0) /* next table */
42177c478bd9Sstevel@tonic-gate {
42187c478bd9Sstevel@tonic-gate c->sub.code.need = e;
42197c478bd9Sstevel@tonic-gate c->sub.code.tree = t->next;
42207c478bd9Sstevel@tonic-gate break;
42217c478bd9Sstevel@tonic-gate }
42227c478bd9Sstevel@tonic-gate if (e & 32) /* end of block */
42237c478bd9Sstevel@tonic-gate {
42247c478bd9Sstevel@tonic-gate Tracevv((stderr, "inflate: end of block\n"));
42257c478bd9Sstevel@tonic-gate c->mode = WASH;
42267c478bd9Sstevel@tonic-gate break;
42277c478bd9Sstevel@tonic-gate }
42287c478bd9Sstevel@tonic-gate c->mode = BADCODE; /* invalid code */
42297c478bd9Sstevel@tonic-gate z->msg = "invalid literal/length code";
42307c478bd9Sstevel@tonic-gate r = Z_DATA_ERROR;
42317c478bd9Sstevel@tonic-gate LEAVE
42327c478bd9Sstevel@tonic-gate case LENEXT: /* i: getting length extra (have base) */
42337c478bd9Sstevel@tonic-gate j = c->sub.copy.get;
42347c478bd9Sstevel@tonic-gate NEEDBITS(j)
42357c478bd9Sstevel@tonic-gate c->len += (uInt)b & inflate_mask[j];
42367c478bd9Sstevel@tonic-gate DUMPBITS(j)
42377c478bd9Sstevel@tonic-gate c->sub.code.need = c->dbits;
42387c478bd9Sstevel@tonic-gate c->sub.code.tree = c->dtree;
42397c478bd9Sstevel@tonic-gate Tracevv((stderr, "inflate: length %u\n", c->len));
42407c478bd9Sstevel@tonic-gate c->mode = DIST;
42415b85b345SToomas Soome /* FALLTHROUGH */
42427c478bd9Sstevel@tonic-gate case DIST: /* i: get distance next */
42437c478bd9Sstevel@tonic-gate j = c->sub.code.need;
42447c478bd9Sstevel@tonic-gate NEEDBITS(j)
42457c478bd9Sstevel@tonic-gate t = c->sub.code.tree + ((uInt)b & inflate_mask[j]);
42467c478bd9Sstevel@tonic-gate DUMPBITS(t->bits)
42477c478bd9Sstevel@tonic-gate e = (uInt)(t->exop);
42487c478bd9Sstevel@tonic-gate if (e & 16) /* distance */
42497c478bd9Sstevel@tonic-gate {
42507c478bd9Sstevel@tonic-gate c->sub.copy.get = e & 15;
42517c478bd9Sstevel@tonic-gate c->sub.copy.dist = t->base;
42527c478bd9Sstevel@tonic-gate c->mode = DISTEXT;
42537c478bd9Sstevel@tonic-gate break;
42547c478bd9Sstevel@tonic-gate }
42557c478bd9Sstevel@tonic-gate if ((e & 64) == 0) /* next table */
42567c478bd9Sstevel@tonic-gate {
42577c478bd9Sstevel@tonic-gate c->sub.code.need = e;
42587c478bd9Sstevel@tonic-gate c->sub.code.tree = t->next;
42597c478bd9Sstevel@tonic-gate break;
42607c478bd9Sstevel@tonic-gate }
42617c478bd9Sstevel@tonic-gate c->mode = BADCODE; /* invalid code */
42627c478bd9Sstevel@tonic-gate z->msg = "invalid distance code";
42637c478bd9Sstevel@tonic-gate r = Z_DATA_ERROR;
42647c478bd9Sstevel@tonic-gate LEAVE
42657c478bd9Sstevel@tonic-gate case DISTEXT: /* i: getting distance extra */
42667c478bd9Sstevel@tonic-gate j = c->sub.copy.get;
42677c478bd9Sstevel@tonic-gate NEEDBITS(j)
42687c478bd9Sstevel@tonic-gate c->sub.copy.dist += (uInt)b & inflate_mask[j];
42697c478bd9Sstevel@tonic-gate DUMPBITS(j)
42707c478bd9Sstevel@tonic-gate Tracevv((stderr, "inflate: distance %u\n", c->sub.copy.dist));
42717c478bd9Sstevel@tonic-gate c->mode = COPY;
42725b85b345SToomas Soome /* FALLTHROUGH */
42737c478bd9Sstevel@tonic-gate case COPY: /* o: copying bytes in window, waiting for space */
42747c478bd9Sstevel@tonic-gate #ifndef __TURBOC__ /* Turbo C bug for following expression */
42757c478bd9Sstevel@tonic-gate f = (uInt)(q - s->window) < c->sub.copy.dist ?
42767c478bd9Sstevel@tonic-gate s->end - (c->sub.copy.dist - (q - s->window)) :
42777c478bd9Sstevel@tonic-gate q - c->sub.copy.dist;
42787c478bd9Sstevel@tonic-gate #else
42797c478bd9Sstevel@tonic-gate f = q - c->sub.copy.dist;
42807c478bd9Sstevel@tonic-gate if ((uInt)(q - s->window) < c->sub.copy.dist)
42817c478bd9Sstevel@tonic-gate f = s->end - (c->sub.copy.dist - (q - s->window));
42827c478bd9Sstevel@tonic-gate #endif
42837c478bd9Sstevel@tonic-gate while (c->len)
42847c478bd9Sstevel@tonic-gate {
42857c478bd9Sstevel@tonic-gate NEEDOUT
42867c478bd9Sstevel@tonic-gate OUTBYTE(*f++)
42877c478bd9Sstevel@tonic-gate if (f == s->end)
42887c478bd9Sstevel@tonic-gate f = s->window;
42897c478bd9Sstevel@tonic-gate c->len--;
42907c478bd9Sstevel@tonic-gate }
42917c478bd9Sstevel@tonic-gate c->mode = START;
42927c478bd9Sstevel@tonic-gate break;
42937c478bd9Sstevel@tonic-gate case LIT: /* o: got literal, waiting for output space */
42947c478bd9Sstevel@tonic-gate NEEDOUT
42957c478bd9Sstevel@tonic-gate OUTBYTE(c->sub.lit)
42967c478bd9Sstevel@tonic-gate c->mode = START;
42977c478bd9Sstevel@tonic-gate break;
42987c478bd9Sstevel@tonic-gate case WASH: /* o: got eob, possibly more output */
42997c478bd9Sstevel@tonic-gate FLUSH
43007c478bd9Sstevel@tonic-gate if (s->read != s->write)
43017c478bd9Sstevel@tonic-gate LEAVE
43027c478bd9Sstevel@tonic-gate c->mode = END;
43035b85b345SToomas Soome /* FALLTHROUGH */
43047c478bd9Sstevel@tonic-gate case END:
43057c478bd9Sstevel@tonic-gate r = Z_STREAM_END;
43067c478bd9Sstevel@tonic-gate LEAVE
43077c478bd9Sstevel@tonic-gate case BADCODE: /* x: got error */
43087c478bd9Sstevel@tonic-gate r = Z_DATA_ERROR;
43097c478bd9Sstevel@tonic-gate LEAVE
43107c478bd9Sstevel@tonic-gate default:
43117c478bd9Sstevel@tonic-gate r = Z_STREAM_ERROR;
43127c478bd9Sstevel@tonic-gate LEAVE
43137c478bd9Sstevel@tonic-gate }
43147c478bd9Sstevel@tonic-gate }
43157c478bd9Sstevel@tonic-gate
43167c478bd9Sstevel@tonic-gate
inflate_codes_free(c,z)43177c478bd9Sstevel@tonic-gate local void inflate_codes_free(c, z)
43187c478bd9Sstevel@tonic-gate inflate_codes_statef *c;
43197c478bd9Sstevel@tonic-gate z_stream *z;
43207c478bd9Sstevel@tonic-gate {
43217c478bd9Sstevel@tonic-gate ZFREE(z, c, sizeof(struct inflate_codes_state));
43227c478bd9Sstevel@tonic-gate Tracev((stderr, "inflate: codes free\n"));
43237c478bd9Sstevel@tonic-gate }
43247c478bd9Sstevel@tonic-gate
43257c478bd9Sstevel@tonic-gate /*+++++*/
43267c478bd9Sstevel@tonic-gate /* inflate_util.c -- data and routines common to blocks and codes
43277c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
4328*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
43297c478bd9Sstevel@tonic-gate */
43307c478bd9Sstevel@tonic-gate
43317c478bd9Sstevel@tonic-gate /* copy as much as possible from the sliding window to the output area */
inflate_flush(s,z,r)43327c478bd9Sstevel@tonic-gate local int inflate_flush(s, z, r)
43337c478bd9Sstevel@tonic-gate inflate_blocks_statef *s;
43347c478bd9Sstevel@tonic-gate z_stream *z;
43357c478bd9Sstevel@tonic-gate int r;
43367c478bd9Sstevel@tonic-gate {
43377c478bd9Sstevel@tonic-gate uInt n;
43387c478bd9Sstevel@tonic-gate Bytef *p, *q;
43397c478bd9Sstevel@tonic-gate
43407c478bd9Sstevel@tonic-gate /* local copies of source and destination pointers */
43417c478bd9Sstevel@tonic-gate p = z->next_out;
43427c478bd9Sstevel@tonic-gate q = s->read;
43437c478bd9Sstevel@tonic-gate
43447c478bd9Sstevel@tonic-gate /* compute number of bytes to copy as far as end of window */
43457c478bd9Sstevel@tonic-gate n = (uInt)((q <= s->write ? s->write : s->end) - q);
43467c478bd9Sstevel@tonic-gate if (n > z->avail_out) n = z->avail_out;
43477c478bd9Sstevel@tonic-gate if (n && r == Z_BUF_ERROR) r = Z_OK;
43487c478bd9Sstevel@tonic-gate
43497c478bd9Sstevel@tonic-gate /* update counters */
43507c478bd9Sstevel@tonic-gate z->avail_out -= n;
43517c478bd9Sstevel@tonic-gate z->total_out += n;
43527c478bd9Sstevel@tonic-gate
43537c478bd9Sstevel@tonic-gate /* update check information */
43547c478bd9Sstevel@tonic-gate if (s->checkfn != Z_NULL)
43557c478bd9Sstevel@tonic-gate s->check = (*s->checkfn)(s->check, q, n);
43567c478bd9Sstevel@tonic-gate
43577c478bd9Sstevel@tonic-gate /* copy as far as end of window */
43587c478bd9Sstevel@tonic-gate if (p != NULL) {
43597c478bd9Sstevel@tonic-gate zmemcpy(p, q, n);
43607c478bd9Sstevel@tonic-gate p += n;
43617c478bd9Sstevel@tonic-gate }
43627c478bd9Sstevel@tonic-gate q += n;
43637c478bd9Sstevel@tonic-gate
43647c478bd9Sstevel@tonic-gate /* see if more to copy at beginning of window */
43657c478bd9Sstevel@tonic-gate if (q == s->end)
43667c478bd9Sstevel@tonic-gate {
43677c478bd9Sstevel@tonic-gate /* wrap pointers */
43687c478bd9Sstevel@tonic-gate q = s->window;
43697c478bd9Sstevel@tonic-gate if (s->write == s->end)
43707c478bd9Sstevel@tonic-gate s->write = s->window;
43717c478bd9Sstevel@tonic-gate
43727c478bd9Sstevel@tonic-gate /* compute bytes to copy */
43737c478bd9Sstevel@tonic-gate n = (uInt)(s->write - q);
43747c478bd9Sstevel@tonic-gate if (n > z->avail_out) n = z->avail_out;
43757c478bd9Sstevel@tonic-gate if (n && r == Z_BUF_ERROR) r = Z_OK;
43767c478bd9Sstevel@tonic-gate
43777c478bd9Sstevel@tonic-gate /* update counters */
43787c478bd9Sstevel@tonic-gate z->avail_out -= n;
43797c478bd9Sstevel@tonic-gate z->total_out += n;
43807c478bd9Sstevel@tonic-gate
43817c478bd9Sstevel@tonic-gate /* update check information */
43827c478bd9Sstevel@tonic-gate if (s->checkfn != Z_NULL)
43837c478bd9Sstevel@tonic-gate s->check = (*s->checkfn)(s->check, q, n);
43847c478bd9Sstevel@tonic-gate
43857c478bd9Sstevel@tonic-gate /* copy */
43867c478bd9Sstevel@tonic-gate if (p != NULL) {
43877c478bd9Sstevel@tonic-gate zmemcpy(p, q, n);
43887c478bd9Sstevel@tonic-gate p += n;
43897c478bd9Sstevel@tonic-gate }
43907c478bd9Sstevel@tonic-gate q += n;
43917c478bd9Sstevel@tonic-gate }
43927c478bd9Sstevel@tonic-gate
43937c478bd9Sstevel@tonic-gate /* update pointers */
43947c478bd9Sstevel@tonic-gate z->next_out = p;
43957c478bd9Sstevel@tonic-gate s->read = q;
43967c478bd9Sstevel@tonic-gate
43977c478bd9Sstevel@tonic-gate /* done */
43987c478bd9Sstevel@tonic-gate return r;
43997c478bd9Sstevel@tonic-gate }
44007c478bd9Sstevel@tonic-gate
44017c478bd9Sstevel@tonic-gate
44027c478bd9Sstevel@tonic-gate /*+++++*/
44037c478bd9Sstevel@tonic-gate /* inffast.c -- process literals and length/distance pairs fast
44047c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
4405*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
44067c478bd9Sstevel@tonic-gate */
44077c478bd9Sstevel@tonic-gate
44087c478bd9Sstevel@tonic-gate /* simplify the use of the inflate_huft type with some defines */
44097c478bd9Sstevel@tonic-gate #define base more.Base
44107c478bd9Sstevel@tonic-gate #define next more.Next
44117c478bd9Sstevel@tonic-gate #define exop word.what.Exop
44127c478bd9Sstevel@tonic-gate #define bits word.what.Bits
44137c478bd9Sstevel@tonic-gate
44147c478bd9Sstevel@tonic-gate /* macros for bit input with no checking and for returning unused bytes */
44157c478bd9Sstevel@tonic-gate #define GRABBITS(j) {while(k<(j)){b|=((uLong)NEXTBYTE)<<k;k+=8;}}
44167c478bd9Sstevel@tonic-gate #define UNGRAB {n+=(c=k>>3);p-=c;k&=7;}
44177c478bd9Sstevel@tonic-gate
44187c478bd9Sstevel@tonic-gate /* Called with number of bytes left to write in window at least 258
44197c478bd9Sstevel@tonic-gate (the maximum string length) and number of input bytes available
44207c478bd9Sstevel@tonic-gate at least ten. The ten bytes are six bytes for the longest length/
44217c478bd9Sstevel@tonic-gate distance pair plus four bytes for overloading the bit buffer. */
44227c478bd9Sstevel@tonic-gate
inflate_fast(bl,bd,tl,td,s,z)44237c478bd9Sstevel@tonic-gate local int inflate_fast(bl, bd, tl, td, s, z)
44247c478bd9Sstevel@tonic-gate uInt bl, bd;
44257c478bd9Sstevel@tonic-gate inflate_huft *tl, *td;
44267c478bd9Sstevel@tonic-gate inflate_blocks_statef *s;
44277c478bd9Sstevel@tonic-gate z_stream *z;
44287c478bd9Sstevel@tonic-gate {
44297c478bd9Sstevel@tonic-gate inflate_huft *t; /* temporary pointer */
44307c478bd9Sstevel@tonic-gate uInt e; /* extra bits or operation */
44317c478bd9Sstevel@tonic-gate uLong b; /* bit buffer */
44327c478bd9Sstevel@tonic-gate uInt k; /* bits in bit buffer */
44337c478bd9Sstevel@tonic-gate Bytef *p; /* input data pointer */
44347c478bd9Sstevel@tonic-gate uInt n; /* bytes available there */
44357c478bd9Sstevel@tonic-gate Bytef *q; /* output window write pointer */
44367c478bd9Sstevel@tonic-gate uInt m; /* bytes to end of window or read pointer */
44377c478bd9Sstevel@tonic-gate uInt ml; /* mask for literal/length tree */
44387c478bd9Sstevel@tonic-gate uInt md; /* mask for distance tree */
44397c478bd9Sstevel@tonic-gate uInt c; /* bytes to copy */
44407c478bd9Sstevel@tonic-gate uInt d; /* distance back to copy from */
44417c478bd9Sstevel@tonic-gate Bytef *r; /* copy source pointer */
44427c478bd9Sstevel@tonic-gate
44437c478bd9Sstevel@tonic-gate /* load input, output, bit values */
44447c478bd9Sstevel@tonic-gate LOAD
44457c478bd9Sstevel@tonic-gate
44467c478bd9Sstevel@tonic-gate /* initialize masks */
44477c478bd9Sstevel@tonic-gate ml = inflate_mask[bl];
44487c478bd9Sstevel@tonic-gate md = inflate_mask[bd];
44497c478bd9Sstevel@tonic-gate
44507c478bd9Sstevel@tonic-gate /* do until not enough input or output space for fast loop */
44517c478bd9Sstevel@tonic-gate do { /* assume called with m >= 258 && n >= 10 */
44527c478bd9Sstevel@tonic-gate /* get literal/length code */
44537c478bd9Sstevel@tonic-gate GRABBITS(20) /* max bits for literal/length code */
44547c478bd9Sstevel@tonic-gate if ((e = (t = tl + ((uInt)b & ml))->exop) == 0)
44557c478bd9Sstevel@tonic-gate {
44567c478bd9Sstevel@tonic-gate DUMPBITS(t->bits)
44577c478bd9Sstevel@tonic-gate Tracevv((stderr, t->base >= 0x20 && t->base < 0x7f ?
44587c478bd9Sstevel@tonic-gate "inflate: * literal '%c'\n" :
44597c478bd9Sstevel@tonic-gate "inflate: * literal 0x%02x\n", t->base));
44607c478bd9Sstevel@tonic-gate *q++ = (Byte)t->base;
44617c478bd9Sstevel@tonic-gate m--;
44627c478bd9Sstevel@tonic-gate continue;
44637c478bd9Sstevel@tonic-gate }
44647c478bd9Sstevel@tonic-gate do {
44657c478bd9Sstevel@tonic-gate DUMPBITS(t->bits)
44667c478bd9Sstevel@tonic-gate if (e & 16)
44677c478bd9Sstevel@tonic-gate {
44687c478bd9Sstevel@tonic-gate /* get extra bits for length */
44697c478bd9Sstevel@tonic-gate e &= 15;
44707c478bd9Sstevel@tonic-gate c = t->base + ((uInt)b & inflate_mask[e]);
44717c478bd9Sstevel@tonic-gate DUMPBITS(e)
44727c478bd9Sstevel@tonic-gate Tracevv((stderr, "inflate: * length %u\n", c));
44737c478bd9Sstevel@tonic-gate
44747c478bd9Sstevel@tonic-gate /* decode distance base of block to copy */
44757c478bd9Sstevel@tonic-gate GRABBITS(15); /* max bits for distance code */
44767c478bd9Sstevel@tonic-gate e = (t = td + ((uInt)b & md))->exop;
44777c478bd9Sstevel@tonic-gate do {
44787c478bd9Sstevel@tonic-gate DUMPBITS(t->bits)
44797c478bd9Sstevel@tonic-gate if (e & 16)
44807c478bd9Sstevel@tonic-gate {
44817c478bd9Sstevel@tonic-gate /* get extra bits to add to distance base */
44827c478bd9Sstevel@tonic-gate e &= 15;
44837c478bd9Sstevel@tonic-gate GRABBITS(e) /* get extra bits (up to 13) */
44847c478bd9Sstevel@tonic-gate d = t->base + ((uInt)b & inflate_mask[e]);
44857c478bd9Sstevel@tonic-gate DUMPBITS(e)
44867c478bd9Sstevel@tonic-gate Tracevv((stderr, "inflate: * distance %u\n", d));
44877c478bd9Sstevel@tonic-gate
44887c478bd9Sstevel@tonic-gate /* do the copy */
44897c478bd9Sstevel@tonic-gate m -= c;
44907c478bd9Sstevel@tonic-gate if ((uInt)(q - s->window) >= d) /* offset before dest */
44917c478bd9Sstevel@tonic-gate { /* just copy */
44927c478bd9Sstevel@tonic-gate r = q - d;
44937c478bd9Sstevel@tonic-gate *q++ = *r++; c--; /* minimum count is three, */
44947c478bd9Sstevel@tonic-gate *q++ = *r++; c--; /* so unroll loop a little */
44957c478bd9Sstevel@tonic-gate }
44967c478bd9Sstevel@tonic-gate else /* else offset after destination */
44977c478bd9Sstevel@tonic-gate {
44987c478bd9Sstevel@tonic-gate e = d - (q - s->window); /* bytes from offset to end */
44997c478bd9Sstevel@tonic-gate r = s->end - e; /* pointer to offset */
45007c478bd9Sstevel@tonic-gate if (c > e) /* if source crosses, */
45017c478bd9Sstevel@tonic-gate {
45027c478bd9Sstevel@tonic-gate c -= e; /* copy to end of window */
45037c478bd9Sstevel@tonic-gate do {
45047c478bd9Sstevel@tonic-gate *q++ = *r++;
45057c478bd9Sstevel@tonic-gate } while (--e);
45067c478bd9Sstevel@tonic-gate r = s->window; /* copy rest from start of window */
45077c478bd9Sstevel@tonic-gate }
45087c478bd9Sstevel@tonic-gate }
45097c478bd9Sstevel@tonic-gate do { /* copy all or what's left */
45107c478bd9Sstevel@tonic-gate *q++ = *r++;
45117c478bd9Sstevel@tonic-gate } while (--c);
45127c478bd9Sstevel@tonic-gate break;
45137c478bd9Sstevel@tonic-gate }
45147c478bd9Sstevel@tonic-gate else if ((e & 64) == 0)
45157c478bd9Sstevel@tonic-gate e = (t = t->next + ((uInt)b & inflate_mask[e]))->exop;
45167c478bd9Sstevel@tonic-gate else
45177c478bd9Sstevel@tonic-gate {
45187c478bd9Sstevel@tonic-gate z->msg = "invalid distance code";
45197c478bd9Sstevel@tonic-gate UNGRAB
45207c478bd9Sstevel@tonic-gate UPDATE
45217c478bd9Sstevel@tonic-gate return Z_DATA_ERROR;
45227c478bd9Sstevel@tonic-gate }
45237c478bd9Sstevel@tonic-gate } while (1);
45247c478bd9Sstevel@tonic-gate break;
45257c478bd9Sstevel@tonic-gate }
45267c478bd9Sstevel@tonic-gate if ((e & 64) == 0)
45277c478bd9Sstevel@tonic-gate {
45287c478bd9Sstevel@tonic-gate if ((e = (t = t->next + ((uInt)b & inflate_mask[e]))->exop) == 0)
45297c478bd9Sstevel@tonic-gate {
45307c478bd9Sstevel@tonic-gate DUMPBITS(t->bits)
45317c478bd9Sstevel@tonic-gate Tracevv((stderr, t->base >= 0x20 && t->base < 0x7f ?
45327c478bd9Sstevel@tonic-gate "inflate: * literal '%c'\n" :
45337c478bd9Sstevel@tonic-gate "inflate: * literal 0x%02x\n", t->base));
45347c478bd9Sstevel@tonic-gate *q++ = (Byte)t->base;
45357c478bd9Sstevel@tonic-gate m--;
45367c478bd9Sstevel@tonic-gate break;
45377c478bd9Sstevel@tonic-gate }
45387c478bd9Sstevel@tonic-gate }
45397c478bd9Sstevel@tonic-gate else if (e & 32)
45407c478bd9Sstevel@tonic-gate {
45417c478bd9Sstevel@tonic-gate Tracevv((stderr, "inflate: * end of block\n"));
45427c478bd9Sstevel@tonic-gate UNGRAB
45437c478bd9Sstevel@tonic-gate UPDATE
45447c478bd9Sstevel@tonic-gate return Z_STREAM_END;
45457c478bd9Sstevel@tonic-gate }
45467c478bd9Sstevel@tonic-gate else
45477c478bd9Sstevel@tonic-gate {
45487c478bd9Sstevel@tonic-gate z->msg = "invalid literal/length code";
45497c478bd9Sstevel@tonic-gate UNGRAB
45507c478bd9Sstevel@tonic-gate UPDATE
45517c478bd9Sstevel@tonic-gate return Z_DATA_ERROR;
45527c478bd9Sstevel@tonic-gate }
45537c478bd9Sstevel@tonic-gate } while (1);
45547c478bd9Sstevel@tonic-gate } while (m >= 258 && n >= 10);
45557c478bd9Sstevel@tonic-gate
45567c478bd9Sstevel@tonic-gate /* not enough input or output--restore pointers and return */
45577c478bd9Sstevel@tonic-gate UNGRAB
45587c478bd9Sstevel@tonic-gate UPDATE
45597c478bd9Sstevel@tonic-gate return Z_OK;
45607c478bd9Sstevel@tonic-gate }
45617c478bd9Sstevel@tonic-gate
45627c478bd9Sstevel@tonic-gate
45637c478bd9Sstevel@tonic-gate /*+++++*/
45647c478bd9Sstevel@tonic-gate /* zutil.c -- target dependent utility functions for the compression library
45657c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Jean-loup Gailly.
4566*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
45677c478bd9Sstevel@tonic-gate */
45687c478bd9Sstevel@tonic-gate
45697c478bd9Sstevel@tonic-gate /* From: zutil.c,v 1.8 1995/05/03 17:27:12 jloup Exp */
45707c478bd9Sstevel@tonic-gate
45717c478bd9Sstevel@tonic-gate char *zlib_version = ZLIB_VERSION;
45727c478bd9Sstevel@tonic-gate
45737c478bd9Sstevel@tonic-gate char *z_errmsg[] = {
45747c478bd9Sstevel@tonic-gate "stream end", /* Z_STREAM_END 1 */
45757c478bd9Sstevel@tonic-gate "", /* Z_OK 0 */
45767c478bd9Sstevel@tonic-gate "file error", /* Z_ERRNO (-1) */
45777c478bd9Sstevel@tonic-gate "stream error", /* Z_STREAM_ERROR (-2) */
45787c478bd9Sstevel@tonic-gate "data error", /* Z_DATA_ERROR (-3) */
45797c478bd9Sstevel@tonic-gate "insufficient memory", /* Z_MEM_ERROR (-4) */
45807c478bd9Sstevel@tonic-gate "buffer error", /* Z_BUF_ERROR (-5) */
45817c478bd9Sstevel@tonic-gate ""};
45827c478bd9Sstevel@tonic-gate
45837c478bd9Sstevel@tonic-gate
45847c478bd9Sstevel@tonic-gate /*+++++*/
45857c478bd9Sstevel@tonic-gate /* adler32.c -- compute the Adler-32 checksum of a data stream
45867c478bd9Sstevel@tonic-gate * Copyright (C) 1995 Mark Adler
4587*55fea89dSDan Cross * For conditions of distribution and use, see copyright notice in zlib.h
45887c478bd9Sstevel@tonic-gate */
45897c478bd9Sstevel@tonic-gate
45907c478bd9Sstevel@tonic-gate /* From: adler32.c,v 1.6 1995/05/03 17:27:08 jloup Exp */
45917c478bd9Sstevel@tonic-gate
45927c478bd9Sstevel@tonic-gate #define BASE 65521L /* largest prime smaller than 65536 */
45937c478bd9Sstevel@tonic-gate #define NMAX 5552
45947c478bd9Sstevel@tonic-gate /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
45957c478bd9Sstevel@tonic-gate
45967c478bd9Sstevel@tonic-gate #define DO1(buf) {s1 += *buf++; s2 += s1;}
45977c478bd9Sstevel@tonic-gate #define DO2(buf) DO1(buf); DO1(buf);
45987c478bd9Sstevel@tonic-gate #define DO4(buf) DO2(buf); DO2(buf);
45997c478bd9Sstevel@tonic-gate #define DO8(buf) DO4(buf); DO4(buf);
46007c478bd9Sstevel@tonic-gate #define DO16(buf) DO8(buf); DO8(buf);
46017c478bd9Sstevel@tonic-gate
46027c478bd9Sstevel@tonic-gate /* ========================================================================= */
adler32(adler,buf,len)46037c478bd9Sstevel@tonic-gate uLong adler32(adler, buf, len)
46047c478bd9Sstevel@tonic-gate uLong adler;
46057c478bd9Sstevel@tonic-gate Bytef *buf;
46067c478bd9Sstevel@tonic-gate uInt len;
46077c478bd9Sstevel@tonic-gate {
46087c478bd9Sstevel@tonic-gate unsigned long s1 = adler & 0xffff;
46097c478bd9Sstevel@tonic-gate unsigned long s2 = (adler >> 16) & 0xffff;
46107c478bd9Sstevel@tonic-gate int k;
46117c478bd9Sstevel@tonic-gate
46127c478bd9Sstevel@tonic-gate if (buf == Z_NULL) return 1L;
46137c478bd9Sstevel@tonic-gate
46147c478bd9Sstevel@tonic-gate while (len > 0) {
46157c478bd9Sstevel@tonic-gate k = len < NMAX ? len : NMAX;
46167c478bd9Sstevel@tonic-gate len -= k;
46177c478bd9Sstevel@tonic-gate while (k >= 16) {
46187c478bd9Sstevel@tonic-gate DO16(buf);
46197c478bd9Sstevel@tonic-gate k -= 16;
46207c478bd9Sstevel@tonic-gate }
46217c478bd9Sstevel@tonic-gate if (k != 0) do {
46227c478bd9Sstevel@tonic-gate DO1(buf);
46237c478bd9Sstevel@tonic-gate } while (--k);
46247c478bd9Sstevel@tonic-gate s1 %= BASE;
46257c478bd9Sstevel@tonic-gate s2 %= BASE;
46267c478bd9Sstevel@tonic-gate }
46277c478bd9Sstevel@tonic-gate return (s2 << 16) | s1;
46287c478bd9Sstevel@tonic-gate }
4629