/* * GRUB -- GRand Unified Bootloader * Copyright (C) 1999 Free Software Foundation, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* * Most of this file was originally the source file "inflate.c", written * by Mark Adler. It has been very heavily modified. In particular, the * original would run through the whole file at once, and this version can * be stopped and restarted on any boundary during the decompression process. * * The license and header comments that file are included here. */ /* inflate.c -- Not copyrighted 1992 by Mark Adler version c10p1, 10 January 1993 */ /* You can do whatever you like with this source file, though I would prefer that if you modify it and redistribute it that you include comments to that effect with your name and the date. Thank you. */ /* Inflate deflated (PKZIP's method 8 compressed) data. The compression method searches for as much of the current string of bytes (up to a length of 258) in the previous 32K bytes. If it doesn't find any matches (of at least length 3), it codes the next byte. Otherwise, it codes the length of the matched string and its distance backwards from the current position. There is a single Huffman code that codes both single bytes (called "literals") and match lengths. A second Huffman code codes the distance information, which follows a length code. Each length or distance code actually represents a base value and a number of "extra" (sometimes zero) bits to get to add to the base value. At the end of each deflated block is a special end-of-block (EOB) literal/ length code. The decoding process is basically: get a literal/length code; if EOB then done; if a literal, emit the decoded byte; if a length then get the distance and emit the referred-to bytes from the sliding window of previously emitted data. There are (currently) three kinds of inflate blocks: stored, fixed, and dynamic. The compressor deals with some chunk of data at a time, and decides which method to use on a chunk-by-chunk basis. A chunk might typically be 32K or 64K. If the chunk is uncompressible, then the "stored" method is used. In this case, the bytes are simply stored as is, eight bits per byte, with none of the above coding. The bytes are preceded by a count, since there is no longer an EOB code. If the data is compressible, then either the fixed or dynamic methods are used. In the dynamic method, the compressed data is preceded by an encoding of the literal/length and distance Huffman codes that are to be used to decode this block. The representation is itself Huffman coded, and so is preceded by a description of that code. These code descriptions take up a little space, and so for small blocks, there is a predefined set of codes, called the fixed codes. The fixed method is used if the block codes up smaller that way (usually for quite small chunks), otherwise the dynamic method is used. In the latter case, the codes are customized to the probabilities in the current block, and so can code it much better than the pre-determined fixed codes. The Huffman codes themselves are decoded using a mutli-level table lookup, in order to maximize the speed of decoding plus the speed of building the decoding tables. See the comments below that precede the lbits and dbits tuning parameters. */ /* Notes beyond the 1.93a appnote.txt: 1. Distance pointers never point before the beginning of the output stream. 2. Distance pointers can point back across blocks, up to 32k away. 3. There is an implied maximum of 7 bits for the bit length table and 15 bits for the actual data. 4. If only one code exists, then it is encoded using one bit. (Zero would be more efficient, but perhaps a little confusing.) If two codes exist, they are coded using one bit each (0 and 1). 5. There is no way of sending zero distance codes--a dummy must be sent if there are none. (History: a pre 2.0 version of PKZIP would store blocks with no distance codes, but this was discovered to be too harsh a criterion.) Valid only for 1.93a. 2.04c does allow zero distance codes, which is sent as one code of zero bits in length. 6. There are up to 286 literal/length codes. Code 256 represents the end-of-block. Note however that the static length tree defines 288 codes just to fill out the Huffman codes. Codes 286 and 287 cannot be used though, since there is no length base or extra bits defined for them. Similarly, there are up to 30 distance codes. However, static trees define 32 codes (all 5 bits) to fill out the Huffman codes, but the last two had better not show up in the data. 7. Unzip can check dynamic Huffman blocks for complete code sets. The exception is that a single code would not be complete (see #4). 8. The five bits following the block type is really the number of literal codes sent minus 257. 9. Length codes 8,16,16 are interpreted as 13 length codes of 8 bits (1+6+6). Therefore, to output three times the length, you output three codes (1+1+1), whereas to output four times the same length, you only need two codes (1+3). Hmm. 10. In the tree reconstruction algorithm, Code = Code + Increment only if BitLength(i) is not zero. (Pretty obvious.) 11. Correction: 4 Bits: # of Bit Length codes - 4 (4 - 19) 12. Note: length code 284 can represent 227-258, but length code 285 really is 258. The last length deserves its own, short code since it gets used a lot in very redundant files. The length 258 is special since 258 - 3 (the min match length) is 255. 13. The literal/length and distance code bit lengths are read as a single stream of lengths. It is possible (and advantageous) for a repeat code (16, 17, or 18) to go across the boundary between the two sets of lengths. */ #ifndef NO_DECOMPRESSION #include "shared.h" #include "filesys.h" /* so we can disable decompression */ int no_decompression = 0; /* used to tell if "read" should be redirected to "gunzip_read" */ int compressed_file; /* internal variables only */ static int gzip_data_offset; static int gzip_filepos; static int gzip_filemax; static int gzip_fsmax; static int saved_filepos; static unsigned long gzip_crc; static unsigned long crc; /* internal extra variables for use of inflate code */ static int block_type; static int block_len; static int last_block; static int code_state; /* Function prototypes */ static void initialize_tables (void); static unsigned long updcrc(unsigned char *, unsigned); /* * Linear allocator. */ static unsigned long linalloc_topaddr; static void * linalloc (int size) { linalloc_topaddr = (linalloc_topaddr - size) & ~3; return (void *) linalloc_topaddr; } static void reset_linalloc (void) { linalloc_topaddr = RAW_ADDR ((mbi.mem_upper << 10) + 0x100000); linalloc_topaddr -= ZFS_SCRATCH_SIZE; } /* internal variable swap function */ static void gunzip_swap_values (void) { register int itmp; /* swap filepos */ itmp = filepos; filepos = gzip_filepos; gzip_filepos = itmp; /* swap filemax */ itmp = filemax; filemax = gzip_filemax; gzip_filemax = itmp; /* swap fsmax */ itmp = fsmax; fsmax = gzip_fsmax; gzip_fsmax = itmp; } /* internal function for eating variable-length header fields */ static int bad_field (int len) { char ch = 1; int not_retval = 1; do { if (len >= 0) { if (!(len--)) break; } else { if (!ch) break; } } while ((not_retval = grub_read (&ch, 1)) == 1); return (!not_retval); } /* Little-Endian defines for the 2-byte magic number for gzip files */ #define GZIP_HDR_LE 0x8B1F #define OLD_GZIP_HDR_LE 0x9E1F /* Compression methods (see algorithm.doc) */ #define STORED 0 #define COMPRESSED 1 #define PACKED 2 #define LZHED 3 /* methods 4 to 7 reserved */ #define DEFLATED 8 #define MAX_METHODS 9 /* gzip flag byte */ #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */ #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ #define COMMENT 0x10 /* bit 4 set: file comment present */ #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ #define RESERVED 0xC0 /* bit 6,7: reserved */ #define UNSUPP_FLAGS (CONTINUATION|ENCRYPTED|RESERVED) /* inflate block codes */ #define INFLATE_STORED 0 #define INFLATE_FIXED 1 #define INFLATE_DYNAMIC 2 typedef unsigned char uch; typedef unsigned short ush; typedef unsigned long ulg; /* * Window Size * * This must be a power of two, and at least 32K for zip's deflate method */ #define WSIZE 0x8000 int gunzip_test_header (void) { unsigned char buf[10]; /* "compressed_file" is already reset to zero by this point */ /* * This checks if the file is gzipped. If a problem occurs here * (other than a real error with the disk) then we don't think it * is a compressed file, and simply mark it as such. */ if (no_decompression || grub_read (buf, 10) != 10 || ((*((unsigned short *) buf) != GZIP_HDR_LE) && (*((unsigned short *) buf) != OLD_GZIP_HDR_LE))) { filepos = 0; return ! errnum; } /* * This does consistency checking on the header data. If a * problem occurs from here on, then we have corrupt or otherwise * bad data, and the error should be reported to the user. */ if (buf[2] != DEFLATED || (buf[3] & UNSUPP_FLAGS) || ((buf[3] & EXTRA_FIELD) && (grub_read (buf, 2) != 2 || bad_field (*((unsigned short *) buf)))) || ((buf[3] & ORIG_NAME) && bad_field (-1)) || ((buf[3] & COMMENT) && bad_field (-1))) { if (! errnum) errnum = ERR_BAD_GZIP_HEADER; return 0; } gzip_data_offset = filepos; /* We could read the last 8 bytes of the file to get the uncompressed * size. Doing so under tftp would cause the file to be downloaded * twice, which can be problem with large files. So we set it to * MAXINT and correct it later when we get to the end of the file * in get_byte(). */ gzip_fsmax = gzip_filemax = MAXINT; initialize_tables (); compressed_file = 1; gunzip_swap_values (); /* * Now "gzip_*" values refer to the compressed data. */ filepos = 0; crc = (ulg)0xffffffffUL; return 1; } /* Huffman code lookup table entry--this entry is four bytes for machines that have 16-bit pointers (e.g. PC's in the small or medium model). Valid extra bits are 0..13. e == 15 is EOB (end of block), e == 16 means that v is a literal, 16 < e < 32 means that v is a pointer to the next table, which codes e - 16 bits, and lastly e == 99 indicates an unused code. If a code with e == 99 is looked up, this implies an error in the data. */ struct huft { uch e; /* number of extra bits or operation */ uch b; /* number of bits in this code or subcode */ union { ush n; /* literal, length base, or distance base */ struct huft *t; /* pointer to next level of table */ } v; }; /* The inflate algorithm uses a sliding 32K byte window on the uncompressed stream to find repeated byte strings. This is implemented here as a circular buffer. The index is updated simply by incrementing and then and'ing with 0x7fff (32K-1). */ /* It is left to other modules to supply the 32K area. It is assumed to be usable as if it were declared "uch slide[32768];" or as just "uch *slide;" and then malloc'ed in the latter case. The definition must be in unzip.h, included above. */ /* sliding window in uncompressed data */ static uch slide[WSIZE]; /* current position in slide */ static unsigned wp; /* Tables for deflate from PKZIP's appnote.txt. */ static unsigned bitorder[] = { /* Order of the bit length code lengths */ 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; static ush cplens[] = { /* Copy lengths for literal codes 257..285 */ 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0}; /* note: see note #13 above about the 258 in this list. */ static ush cplext[] = { /* Extra bits for literal codes 257..285 */ 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, 99, 99}; /* 99==invalid */ static ush cpdist[] = { /* Copy offsets for distance codes 0..29 */ 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577}; static ush cpdext[] = { /* Extra bits for distance codes */ 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}; /* Huffman code decoding is performed using a multi-level table lookup. The fastest way to decode is to simply build a lookup table whose size is determined by the longest code. However, the time it takes to build this table can also be a factor if the data being decoded is not very long. The most common codes are necessarily the shortest codes, so those codes dominate the decoding time, and hence the speed. The idea is you can have a shorter table that decodes the shorter, more probable codes, and then point to subsidiary tables for the longer codes. The time it costs to decode the longer codes is then traded against the time it takes to make longer tables. This results of this trade are in the variables lbits and dbits below. lbits is the number of bits the first level table for literal/ length codes can decode in one step, and dbits is the same thing for the distance codes. Subsequent tables are also less than or equal to those sizes. These values may be adjusted either when all of the codes are shorter than that, in which case the longest code length in bits is used, or when the shortest code is *longer* than the requested table size, in which case the length of the shortest code in bits is used. There are two different values for the two tables, since they code a different number of possibilities each. The literal/length table codes 286 possible values, or in a flat code, a little over eight bits. The distance table codes 30 possible values, or a little less than five bits, flat. The optimum values for speed end up being about one bit more than those, so lbits is 8+1 and dbits is 5+1. The optimum values may differ though from machine to machine, and possibly even between compilers. Your mileage may vary. */ static int lbits = 9; /* bits in base literal/length lookup table */ static int dbits = 6; /* bits in base distance lookup table */ /* If BMAX needs to be larger than 16, then h and x[] should be ulg. */ #define BMAX 16 /* maximum bit length of any code (16 for explode) */ #define N_MAX 288 /* maximum number of codes in any set */ static unsigned hufts; /* track memory usage */ /* Macros for inflate() bit peeking and grabbing. The usage is: NEEDBITS(j) x = b & mask_bits[j]; DUMPBITS(j) where NEEDBITS makes sure that b has at least j bits in it, and DUMPBITS removes the bits from b. The macros use the variable k for the number of bits in b. Normally, b and k are register variables for speed, and are initialized at the beginning of a routine that uses these macros from a global bit buffer and count. If we assume that EOB will be the longest code, then we will never ask for bits with NEEDBITS that are beyond the end of the stream. So, NEEDBITS should not read any more bytes than are needed to meet the request. Then no bytes need to be "returned" to the buffer at the end of the last block. However, this assumption is not true for fixed blocks--the EOB code is 7 bits, but the other literal/length codes can be 8 or 9 bits. (The EOB code is shorter than other codes because fixed blocks are generally short. So, while a block always has an EOB, many other literal/length codes have a significantly lower probability of showing up at all.) However, by making the first table have a lookup of seven bits, the EOB code will be found in that first lookup, and so will not require that too many bits be pulled from the stream. */ static ulg bb; /* bit buffer */ static unsigned bk; /* bits in bit buffer */ static ush mask_bits[] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff }; #define NEEDBITS(n) do {while(k<(n)){b|=((ulg)get_byte())<>=(n);k-=(n);} while (0) #define INBUFSIZ 0x2000 static uch inbuf[INBUFSIZ]; static int bufloc; static uch endbuf[8]; static int get_byte (void) { if (filepos == gzip_data_offset || bufloc == INBUFSIZ) { int pos; int old_filepos = filepos; bufloc = 0; grub_read (inbuf, INBUFSIZ); /* If there are 8 bytes or less left, we have read in all the * the file content. So get the last 8 bytes and get the crc * and uncompressed size. This is important for the loop in * gunzip_read() to terminate properly. */ if (filepos >= filemax - 8) { uch *eb = endbuf; for (pos = filemax - 8; pos < filepos; pos++) *eb++ = inbuf[pos - old_filepos]; if (filemax > filepos) grub_read(eb, filemax - filepos); gzip_crc = *((unsigned long *) endbuf); gzip_filemax = *((unsigned long *) (endbuf + 4)); } } return inbuf[bufloc++]; } /* decompression global pointers */ static struct huft *tl; /* literal/length code table */ static struct huft *td; /* distance code table */ static int bl; /* lookup bits for tl */ static int bd; /* lookup bits for td */ /* more function prototypes */ static int huft_build (unsigned *, unsigned, unsigned, ush *, ush *, struct huft **, int *); static int inflate_codes_in_window (void); /* Given a list of code lengths and a maximum table size, make a set of tables to decode that set of codes. Return zero on success, one if the given code set is incomplete (the tables are still built in this case), two if the input is invalid (all zero length codes or an oversubscribed set of lengths), and three if not enough memory. */ static int huft_build (unsigned *b, /* code lengths in bits (all assumed <= BMAX) */ unsigned n, /* number of codes (assumed <= N_MAX) */ unsigned s, /* number of simple-valued codes (0..s-1) */ ush * d, /* list of base values for non-simple codes */ ush * e, /* list of extra bits for non-simple codes */ struct huft **t, /* result: starting table */ int *m) /* maximum lookup bits, returns actual */ { unsigned a; /* counter for codes of length k */ unsigned c[BMAX + 1]; /* bit length count table */ unsigned f; /* i repeats in table every f entries */ int g; /* maximum code length */ int h; /* table level */ register unsigned i; /* counter, current code */ register unsigned j; /* counter */ register int k; /* number of bits in current code */ int l; /* bits per table (returned in m) */ register unsigned *p; /* pointer into c[], b[], or v[] */ register struct huft *q; /* points to current table */ struct huft r; /* table entry for structure assignment */ struct huft *u[BMAX]; /* table stack */ unsigned v[N_MAX]; /* values in order of bit length */ register int w; /* bits before this table == (l * h) */ unsigned x[BMAX + 1]; /* bit offsets, then code stack */ unsigned *xp; /* pointer into x */ int y; /* number of dummy codes added */ unsigned z; /* number of entries in current table */ /* Generate counts for each bit length */ memset ((char *) c, 0, sizeof (c)); p = b; i = n; do { c[*p]++; /* assume all entries <= BMAX */ p++; /* Can't combine with above line (Solaris bug) */ } while (--i); if (c[0] == n) /* null input--all zero length codes */ { *t = (struct huft *) NULL; *m = 0; return 0; } /* Find minimum and maximum length, bound *m by those */ l = *m; for (j = 1; j <= BMAX; j++) if (c[j]) break; k = j; /* minimum code length */ if ((unsigned) l < j) l = j; for (i = BMAX; i; i--) if (c[i]) break; g = i; /* maximum code length */ if ((unsigned) l > i) l = i; *m = l; /* Adjust last length count to fill out codes, if needed */ for (y = 1 << j; j < i; j++, y <<= 1) if ((y -= c[j]) < 0) return 2; /* bad input: more codes than bits */ if ((y -= c[i]) < 0) return 2; c[i] += y; /* Generate starting offsets into the value table for each length */ x[1] = j = 0; p = c + 1; xp = x + 2; while (--i) { /* note that i == g from above */ *xp++ = (j += *p++); } /* Make a table of values in order of bit lengths */ p = b; i = 0; do { if ((j = *p++) != 0) v[x[j]++] = i; } while (++i < n); /* Generate the Huffman codes and for each, make the table entries */ x[0] = i = 0; /* first Huffman code is zero */ p = v; /* grab values in bit order */ h = -1; /* no tables yet--level -1 */ w = -l; /* bits decoded == (l * h) */ u[0] = (struct huft *) NULL; /* just to keep compilers happy */ q = (struct huft *) NULL; /* ditto */ z = 0; /* ditto */ /* go through the bit lengths (k already is bits in shortest code) */ for (; k <= g; k++) { a = c[k]; while (a--) { /* here i is the Huffman code of length k bits for value *p */ /* make tables up to required level */ while (k > w + l) { h++; w += l; /* previous table always l bits */ /* compute minimum size table less than or equal to l bits */ z = (z = g - w) > (unsigned) l ? l : z; /* upper limit on table size */ if ((f = 1 << (j = k - w)) > a + 1) /* try a k-w bit table */ { /* too few codes for k-w bit table */ f -= a + 1; /* deduct codes from patterns left */ xp = c + k; while (++j < z) /* try smaller tables up to z bits */ { if ((f <<= 1) <= *++xp) break; /* enough codes to use up j bits */ f -= *xp; /* else deduct codes from patterns */ } } z = 1 << j; /* table entries for j-bit table */ /* allocate and link in new table */ q = (struct huft *) linalloc ((z + 1) * sizeof (struct huft)); hufts += z + 1; /* track memory usage */ *t = q + 1; /* link to list for huft_free() */ *(t = &(q->v.t)) = (struct huft *) NULL; u[h] = ++q; /* table starts after link */ /* connect to last table, if there is one */ if (h) { x[h] = i; /* save pattern for backing up */ r.b = (uch) l; /* bits to dump before this table */ r.e = (uch) (16 + j); /* bits in this table */ r.v.t = q; /* pointer to this table */ j = i >> (w - l); /* (get around Turbo C bug) */ u[h - 1][j] = r; /* connect to last table */ } } /* set up table entry in r */ r.b = (uch) (k - w); if (p >= v + n) r.e = 99; /* out of values--invalid code */ else if (*p < s) { r.e = (uch) (*p < 256 ? 16 : 15); /* 256 is end-of-block code */ r.v.n = (ush) (*p); /* simple code is just the value */ p++; /* one compiler does not like *p++ */ } else { r.e = (uch) e[*p - s]; /* non-simple--look up in lists */ r.v.n = d[*p++ - s]; } /* fill code-like entries with r */ f = 1 << (k - w); for (j = i >> w; j < z; j += f) q[j] = r; /* backwards increment the k-bit code i */ for (j = 1 << (k - 1); i & j; j >>= 1) i ^= j; i ^= j; /* backup over finished tables */ while ((i & ((1 << w) - 1)) != x[h]) { h--; /* don't need to update q */ w -= l; } } } /* Return true (1) if we were given an incomplete table */ return y != 0 && g != 1; } /* * inflate (decompress) the codes in a deflated (compressed) block. * Return an error code or zero if it all goes ok. */ static unsigned inflate_n, inflate_d; static int inflate_codes_in_window (void) { register unsigned e; /* table entry flag/number of extra bits */ unsigned n, d; /* length and index for copy */ unsigned w; /* current window position */ struct huft *t; /* pointer to table entry */ unsigned ml, md; /* masks for bl and bd bits */ register ulg b; /* bit buffer */ register unsigned k; /* number of bits in bit buffer */ /* make local copies of globals */ d = inflate_d; n = inflate_n; b = bb; /* initialize bit buffer */ k = bk; w = wp; /* initialize window position */ /* inflate the coded data */ ml = mask_bits[bl]; /* precompute masks for speed */ md = mask_bits[bd]; for (;;) /* do until end of block */ { if (!code_state) { NEEDBITS ((unsigned) bl); if ((e = (t = tl + ((unsigned) b & ml))->e) > 16) do { if (e == 99) { errnum = ERR_BAD_GZIP_DATA; return 0; } DUMPBITS (t->b); e -= 16; NEEDBITS (e); } while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e) > 16); DUMPBITS (t->b); if (e == 16) /* then it's a literal */ { slide[w++] = (uch) t->v.n; if (w == WSIZE) break; } else /* it's an EOB or a length */ { /* exit if end of block */ if (e == 15) { block_len = 0; break; } /* get length of block to copy */ NEEDBITS (e); n = t->v.n + ((unsigned) b & mask_bits[e]); DUMPBITS (e); /* decode distance of block to copy */ NEEDBITS ((unsigned) bd); if ((e = (t = td + ((unsigned) b & md))->e) > 16) do { if (e == 99) { errnum = ERR_BAD_GZIP_DATA; return 0; } DUMPBITS (t->b); e -= 16; NEEDBITS (e); } while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e) > 16); DUMPBITS (t->b); NEEDBITS (e); d = w - t->v.n - ((unsigned) b & mask_bits[e]); DUMPBITS (e); code_state++; } } if (code_state) { /* do the copy */ do { n -= (e = (e = WSIZE - ((d &= WSIZE - 1) > w ? d : w)) > n ? n : e); if (w - d >= e) { memmove (slide + w, slide + d, e); w += e; d += e; } else /* purposefully use the overlap for extra copies here!! */ { while (e--) slide[w++] = slide[d++]; } if (w == WSIZE) break; } while (n); if (!n) code_state--; /* did we break from the loop too soon? */ if (w == WSIZE) break; } } /* restore the globals from the locals */ inflate_d = d; inflate_n = n; wp = w; /* restore global window pointer */ bb = b; /* restore global bit buffer */ bk = k; return !block_len; } /* get header for an inflated type 0 (stored) block. */ static void init_stored_block (void) { register ulg b; /* bit buffer */ register unsigned k; /* number of bits in bit buffer */ /* make local copies of globals */ b = bb; /* initialize bit buffer */ k = bk; /* go to byte boundary */ DUMPBITS (k & 7); /* get the length and its complement */ NEEDBITS (16); block_len = ((unsigned) b & 0xffff); DUMPBITS (16); NEEDBITS (16); if (block_len != (unsigned) ((~b) & 0xffff)) errnum = ERR_BAD_GZIP_DATA; DUMPBITS (16); /* restore global variables */ bb = b; bk = k; } /* get header for an inflated type 1 (fixed Huffman codes) block. We should either replace this with a custom decoder, or at least precompute the Huffman tables. */ static void init_fixed_block () { int i; /* temporary variable */ unsigned l[288]; /* length list for huft_build */ /* set up literal table */ for (i = 0; i < 144; i++) l[i] = 8; for (; i < 256; i++) l[i] = 9; for (; i < 280; i++) l[i] = 7; for (; i < 288; i++) /* make a complete, but wrong code set */ l[i] = 8; bl = 7; if ((i = huft_build (l, 288, 257, cplens, cplext, &tl, &bl)) != 0) { errnum = ERR_BAD_GZIP_DATA; return; } /* set up distance table */ for (i = 0; i < 30; i++) /* make an incomplete code set */ l[i] = 5; bd = 5; if ((i = huft_build (l, 30, 0, cpdist, cpdext, &td, &bd)) > 1) { errnum = ERR_BAD_GZIP_DATA; return; } /* indicate we're now working on a block */ code_state = 0; block_len++; } /* get header for an inflated type 2 (dynamic Huffman codes) block. */ static void init_dynamic_block (void) { int i; /* temporary variables */ unsigned j; unsigned l; /* last length */ unsigned m; /* mask for bit lengths table */ unsigned n; /* number of lengths to get */ unsigned nb; /* number of bit length codes */ unsigned nl; /* number of literal/length codes */ unsigned nd; /* number of distance codes */ unsigned ll[286 + 30]; /* literal/length and distance code lengths */ register ulg b; /* bit buffer */ register unsigned k; /* number of bits in bit buffer */ /* make local bit buffer */ b = bb; k = bk; /* read in table lengths */ NEEDBITS (5); nl = 257 + ((unsigned) b & 0x1f); /* number of literal/length codes */ DUMPBITS (5); NEEDBITS (5); nd = 1 + ((unsigned) b & 0x1f); /* number of distance codes */ DUMPBITS (5); NEEDBITS (4); nb = 4 + ((unsigned) b & 0xf); /* number of bit length codes */ DUMPBITS (4); if (nl > 286 || nd > 30) { errnum = ERR_BAD_GZIP_DATA; return; } /* read in bit-length-code lengths */ for (j = 0; j < nb; j++) { NEEDBITS (3); ll[bitorder[j]] = (unsigned) b & 7; DUMPBITS (3); } for (; j < 19; j++) ll[bitorder[j]] = 0; /* build decoding table for trees--single level, 7 bit lookup */ bl = 7; if ((i = huft_build (ll, 19, 19, NULL, NULL, &tl, &bl)) != 0) { errnum = ERR_BAD_GZIP_DATA; return; } /* read in literal and distance code lengths */ n = nl + nd; m = mask_bits[bl]; i = l = 0; while ((unsigned) i < n) { NEEDBITS ((unsigned) bl); j = (td = tl + ((unsigned) b & m))->b; DUMPBITS (j); j = td->v.n; if (j < 16) /* length of code in bits (0..15) */ ll[i++] = l = j; /* save last length in l */ else if (j == 16) /* repeat last length 3 to 6 times */ { NEEDBITS (2); j = 3 + ((unsigned) b & 3); DUMPBITS (2); if ((unsigned) i + j > n) { errnum = ERR_BAD_GZIP_DATA; return; } while (j--) ll[i++] = l; } else if (j == 17) /* 3 to 10 zero length codes */ { NEEDBITS (3); j = 3 + ((unsigned) b & 7); DUMPBITS (3); if ((unsigned) i + j > n) { errnum = ERR_BAD_GZIP_DATA; return; } while (j--) ll[i++] = 0; l = 0; } else /* j == 18: 11 to 138 zero length codes */ { NEEDBITS (7); j = 11 + ((unsigned) b & 0x7f); DUMPBITS (7); if ((unsigned) i + j > n) { errnum = ERR_BAD_GZIP_DATA; return; } while (j--) ll[i++] = 0; l = 0; } } /* free decoding table for trees */ reset_linalloc (); /* restore the global bit buffer */ bb = b; bk = k; /* build the decoding tables for literal/length and distance codes */ bl = lbits; if ((i = huft_build (ll, nl, 257, cplens, cplext, &tl, &bl)) != 0) { #if 0 if (i == 1) printf ("gunzip: incomplete literal tree\n"); #endif errnum = ERR_BAD_GZIP_DATA; return; } bd = dbits; if ((i = huft_build (ll + nl, nd, 0, cpdist, cpdext, &td, &bd)) != 0) { #if 0 if (i == 1) printf ("gunzip: incomplete distance tree\n"); #endif errnum = ERR_BAD_GZIP_DATA; return; } /* indicate we're now working on a block */ code_state = 0; block_len++; } static void get_new_block (void) { register ulg b; /* bit buffer */ register unsigned k; /* number of bits in bit buffer */ hufts = 0; /* make local bit buffer */ b = bb; k = bk; /* read in last block bit */ NEEDBITS (1); last_block = (int) b & 1; DUMPBITS (1); /* read in block type */ NEEDBITS (2); block_type = (unsigned) b & 3; DUMPBITS (2); /* restore the global bit buffer */ bb = b; bk = k; if (block_type == INFLATE_STORED) init_stored_block (); if (block_type == INFLATE_FIXED) init_fixed_block (); if (block_type == INFLATE_DYNAMIC) init_dynamic_block (); } static void inflate_window (void) { /* initialize window */ wp = 0; /* * Main decompression loop. */ while (wp < WSIZE && !errnum) { if (!block_len) { if (last_block) break; get_new_block (); } if (block_type > INFLATE_DYNAMIC) errnum = ERR_BAD_GZIP_DATA; if (errnum) return; /* * Expand stored block here. */ if (block_type == INFLATE_STORED) { int w = wp; /* * This is basically a glorified pass-through */ while (block_len && w < WSIZE && !errnum) { slide[w++] = get_byte (); block_len--; } wp = w; continue; } /* * Expand other kind of block. */ if (inflate_codes_in_window ()) reset_linalloc (); } saved_filepos += WSIZE; } static void initialize_tables (void) { saved_filepos = 0; filepos = gzip_data_offset; /* initialize window, bit buffer */ bk = 0; bb = 0; /* reset partial decompression code */ last_block = 0; block_len = 0; /* reset memory allocation stuff */ reset_linalloc (); } int gunzip_read (char *buf, int len) { int ret = 0; int check_crc; ulg crc_value = 0xffffffffUL; compressed_file = 0; gunzip_swap_values (); /* * Now "gzip_*" values refer to the uncompressed data. */ /* do we reset decompression to the beginning of the file? */ if (saved_filepos > gzip_filepos + WSIZE) initialize_tables (); /* perform CRC check only if reading the entire file */ check_crc = (saved_filepos == 0 && len == MAXINT); /* * This loop operates upon uncompressed data only. The only * special thing it does is to make sure the decompression * window is within the range of data it needs. */ while (len > 0 && !errnum) { register int size; register char *srcaddr; while (gzip_filepos >= saved_filepos && !errnum) inflate_window (); if (errnum) break; /* We could have started with an unknown gzip_filemax (MAXINT) * which has been updated in get_byte(). If so, update len * to avoid reading beyond the end. */ if (len > (gzip_filemax - gzip_filepos)) { len = gzip_filemax - gzip_filepos; if (len < 0) { errnum = ERR_BAD_GZIP_DATA; break; } } srcaddr = (char *) ((gzip_filepos & (WSIZE - 1)) + slide); size = saved_filepos - gzip_filepos; if (size > len) size = len; memmove (buf, srcaddr, size); /* do CRC calculation here! */ crc_value = updcrc(buf, (unsigned)size); buf += size; len -= size; gzip_filepos += size; ret += size; } /* check for CRC error if reading entire file */ if (!errnum && check_crc && gzip_crc != crc_value) { #if 0 printf ("gunzip: crc value 0x%x, expected 0x%x\n", crc_value, gzip_crc); #endif errnum = ERR_BAD_GZIP_CRC; } compressed_file = 1; gunzip_swap_values (); /* * Now "gzip_*" values refer to the compressed data. */ if (errnum) ret = 0; return ret; } /* The crc_23_tab and updcrc() are adapted from gzip 1.3.3 */ /* ======================================================================== * Table of CRC-32's of all single-byte values (made by makecrc.c) */ static ulg crc_32_tab[] = { 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL }; /* =========================================================================== * Run a set of bytes through the crc shift register. If s is a NULL * pointer, then initialize the crc shift register contents instead. * Return the current crc in either case. */ static ulg updcrc(s, n) uch *s; /* pointer to bytes to pump through */ unsigned n; /* number of bytes in s[] */ { register ulg c; /* temporary variable */ c = crc; if (n) do { c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8); } while (--n); crc = c; return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */ } #endif /* ! NO_DECOMPRESSION */