1734b3a42SToomas Soome /*
2199767f8SToomas Soome * Copyright (c) 1998 Michael Smith.
3199767f8SToomas Soome * All rights reserved.
4199767f8SToomas Soome *
5199767f8SToomas Soome * Redistribution and use in source and binary forms, with or without
6199767f8SToomas Soome * modification, are permitted provided that the following conditions
7199767f8SToomas Soome * are met:
8199767f8SToomas Soome * 1. Redistributions of source code must retain the above copyright
9199767f8SToomas Soome * notice, this list of conditions and the following disclaimer.
10199767f8SToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
11199767f8SToomas Soome * notice, this list of conditions and the following disclaimer in the
12199767f8SToomas Soome * documentation and/or other materials provided with the distribution.
13199767f8SToomas Soome *
14199767f8SToomas Soome * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15199767f8SToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16199767f8SToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17199767f8SToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18199767f8SToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19199767f8SToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20199767f8SToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21199767f8SToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22199767f8SToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23199767f8SToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24199767f8SToomas Soome * SUCH DAMAGE.
25199767f8SToomas Soome */
26199767f8SToomas Soome
27199767f8SToomas Soome #include <sys/cdefs.h>
28199767f8SToomas Soome
29199767f8SToomas Soome #include "stand.h"
30199767f8SToomas Soome
31199767f8SToomas Soome #include <sys/stat.h>
32199767f8SToomas Soome #include <string.h>
33199767f8SToomas Soome #include <zlib.h>
34199767f8SToomas Soome
35*fd5b2b1fSToomas Soome #define Z_BUFSIZE 16384 /* match NFSREAD_MAX_SIZE */
36199767f8SToomas Soome
37199767f8SToomas Soome struct z_file
38199767f8SToomas Soome {
39734b3a42SToomas Soome int zf_rawfd;
40734b3a42SToomas Soome off_t zf_dataoffset;
41734b3a42SToomas Soome z_stream zf_zstream;
42734b3a42SToomas Soome int zf_endseen;
43*fd5b2b1fSToomas Soome unsigned char zf_buf[Z_BUFSIZE];
44199767f8SToomas Soome };
45199767f8SToomas Soome
46734b3a42SToomas Soome static int zf_fill(struct z_file *z);
47734b3a42SToomas Soome static int zf_open(const char *path, struct open_file *f);
48734b3a42SToomas Soome static int zf_close(struct open_file *f);
49734b3a42SToomas Soome static int zf_read(struct open_file *f, void *buf, size_t size, size_t *resid);
50734b3a42SToomas Soome static off_t zf_seek(struct open_file *f, off_t offset, int where);
51734b3a42SToomas Soome static int zf_stat(struct open_file *f, struct stat *sb);
52199767f8SToomas Soome
53199767f8SToomas Soome struct fs_ops gzipfs_fsops = {
54734b3a42SToomas Soome .fs_name = "zip",
55734b3a42SToomas Soome .fo_open = zf_open,
56734b3a42SToomas Soome .fo_close = zf_close,
57734b3a42SToomas Soome .fo_read = zf_read,
58734b3a42SToomas Soome .fo_write = null_write,
59734b3a42SToomas Soome .fo_seek = zf_seek,
60734b3a42SToomas Soome .fo_stat = zf_stat,
61734b3a42SToomas Soome .fo_readdir = null_readdir
62199767f8SToomas Soome };
63199767f8SToomas Soome
64199767f8SToomas Soome static int
zf_fill(struct z_file * zf)65199767f8SToomas Soome zf_fill(struct z_file *zf)
66199767f8SToomas Soome {
67734b3a42SToomas Soome int result;
68734b3a42SToomas Soome int req;
69734b3a42SToomas Soome
70734b3a42SToomas Soome req = Z_BUFSIZE - zf->zf_zstream.avail_in;
71734b3a42SToomas Soome result = 0;
72734b3a42SToomas Soome
73734b3a42SToomas Soome /* If we need more */
74734b3a42SToomas Soome if (req > 0) {
75734b3a42SToomas Soome /* move old data to bottom of buffer */
76734b3a42SToomas Soome if (req < Z_BUFSIZE)
77734b3a42SToomas Soome bcopy(zf->zf_buf + req, zf->zf_buf, Z_BUFSIZE - req);
78734b3a42SToomas Soome
79734b3a42SToomas Soome /* read to fill buffer and update availibility data */
80734b3a42SToomas Soome result = read(zf->zf_rawfd,
81734b3a42SToomas Soome zf->zf_buf + zf->zf_zstream.avail_in, req);
82734b3a42SToomas Soome zf->zf_zstream.next_in = zf->zf_buf;
83734b3a42SToomas Soome if (result >= 0)
84734b3a42SToomas Soome zf->zf_zstream.avail_in += result;
85734b3a42SToomas Soome }
86734b3a42SToomas Soome return (result);
87199767f8SToomas Soome }
88199767f8SToomas Soome
89199767f8SToomas Soome /*
90199767f8SToomas Soome * Adapted from get_byte/check_header in libz
91199767f8SToomas Soome *
92199767f8SToomas Soome * Returns 0 if the header is OK, nonzero if not.
93199767f8SToomas Soome */
94199767f8SToomas Soome static int
get_byte(struct z_file * zf,off_t * curoffp)95199767f8SToomas Soome get_byte(struct z_file *zf, off_t *curoffp)
96199767f8SToomas Soome {
97734b3a42SToomas Soome if ((zf->zf_zstream.avail_in == 0) && (zf_fill(zf) == -1))
98734b3a42SToomas Soome return (-1);
99734b3a42SToomas Soome zf->zf_zstream.avail_in--;
100734b3a42SToomas Soome ++*curoffp;
101734b3a42SToomas Soome return (*(zf->zf_zstream.next_in)++);
102199767f8SToomas Soome }
103199767f8SToomas Soome
104199767f8SToomas Soome static int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
105199767f8SToomas Soome
106199767f8SToomas Soome /* gzip flag byte */
107734b3a42SToomas Soome #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
108734b3a42SToomas Soome #define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
109734b3a42SToomas Soome #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
110734b3a42SToomas Soome #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
111734b3a42SToomas Soome #define COMMENT 0x10 /* bit 4 set: file comment present */
112734b3a42SToomas Soome #define RESERVED 0xE0 /* bits 5..7: reserved */
113199767f8SToomas Soome
114199767f8SToomas Soome static int
check_header(struct z_file * zf)115199767f8SToomas Soome check_header(struct z_file *zf)
116199767f8SToomas Soome {
117734b3a42SToomas Soome int method; /* method byte */
118734b3a42SToomas Soome int flags; /* flags byte */
119734b3a42SToomas Soome uInt len;
120734b3a42SToomas Soome int c;
121734b3a42SToomas Soome
122734b3a42SToomas Soome zf->zf_dataoffset = 0;
123734b3a42SToomas Soome /* Check the gzip magic header */
124734b3a42SToomas Soome for (len = 0; len < 2; len++) {
125734b3a42SToomas Soome c = get_byte(zf, &zf->zf_dataoffset);
126734b3a42SToomas Soome if (c != gz_magic[len]) {
127734b3a42SToomas Soome return (1);
128734b3a42SToomas Soome }
129734b3a42SToomas Soome }
130734b3a42SToomas Soome method = get_byte(zf, &zf->zf_dataoffset);
131734b3a42SToomas Soome flags = get_byte(zf, &zf->zf_dataoffset);
132734b3a42SToomas Soome if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
133734b3a42SToomas Soome return (1);
134734b3a42SToomas Soome }
135734b3a42SToomas Soome
136734b3a42SToomas Soome /* Discard time, xflags and OS code: */
137734b3a42SToomas Soome for (len = 0; len < 6; len++)
138734b3a42SToomas Soome (void) get_byte(zf, &zf->zf_dataoffset);
139734b3a42SToomas Soome
140734b3a42SToomas Soome if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
141734b3a42SToomas Soome len = (uInt)get_byte(zf, &zf->zf_dataoffset);
142734b3a42SToomas Soome len += ((uInt)get_byte(zf, &zf->zf_dataoffset))<<8;
143734b3a42SToomas Soome /* len is garbage if EOF but the loop below will quit anyway */
144734b3a42SToomas Soome while (len-- != 0 && get_byte(zf, &zf->zf_dataoffset) != -1)
145734b3a42SToomas Soome ;
146734b3a42SToomas Soome }
147734b3a42SToomas Soome if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
148734b3a42SToomas Soome while ((c = get_byte(zf, &zf->zf_dataoffset)) != 0 && c != -1)
149734b3a42SToomas Soome ;
150734b3a42SToomas Soome }
151734b3a42SToomas Soome if ((flags & COMMENT) != 0) { /* skip the .gz file comment */
152734b3a42SToomas Soome while ((c = get_byte(zf, &zf->zf_dataoffset)) != 0 && c != -1)
153734b3a42SToomas Soome ;
154199767f8SToomas Soome }
155734b3a42SToomas Soome if ((flags & HEAD_CRC) != 0) { /* skip the header crc */
156734b3a42SToomas Soome for (len = 0; len < 2; len++)
157734b3a42SToomas Soome c = get_byte(zf, &zf->zf_dataoffset);
158734b3a42SToomas Soome }
159734b3a42SToomas Soome /* if there's data left, we're in business */
160734b3a42SToomas Soome return ((c == -1) ? 1 : 0);
161199767f8SToomas Soome }
162734b3a42SToomas Soome
163199767f8SToomas Soome static int
zf_open(const char * fname,struct open_file * f)164199767f8SToomas Soome zf_open(const char *fname, struct open_file *f)
165199767f8SToomas Soome {
166734b3a42SToomas Soome char *zfname;
167734b3a42SToomas Soome int rawfd;
168734b3a42SToomas Soome struct z_file *zf;
169734b3a42SToomas Soome char *cp;
170734b3a42SToomas Soome int error;
171734b3a42SToomas Soome struct stat sb;
172734b3a42SToomas Soome
173734b3a42SToomas Soome /* Have to be in "just read it" mode */
174734b3a42SToomas Soome if (f->f_flags != F_READ)
175734b3a42SToomas Soome return (EPERM);
176734b3a42SToomas Soome
177734b3a42SToomas Soome /* If the name already ends in .gz or .bz2, ignore it */
178734b3a42SToomas Soome if ((cp = strrchr(fname, '.')) && (strcmp(cp, ".gz") == 0 ||
179734b3a42SToomas Soome strcmp(cp, ".bz2") == 0 || strcmp(cp, ".split") == 0))
180734b3a42SToomas Soome return (ENOENT);
181734b3a42SToomas Soome
182734b3a42SToomas Soome /* Try to open the compressed datafile */
183734b3a42SToomas Soome rawfd = open(fname, O_RDONLY | F_GZIP);
184734b3a42SToomas Soome if (rawfd == -1) {
185734b3a42SToomas Soome /* add .gz sufix and try again */
186734b3a42SToomas Soome zfname = malloc(strlen(fname) + 4);
187734b3a42SToomas Soome if (zfname == NULL)
188734b3a42SToomas Soome return (ENOMEM);
189734b3a42SToomas Soome sprintf(zfname, "%s.gz", fname);
190734b3a42SToomas Soome rawfd = open(zfname, O_RDONLY);
191734b3a42SToomas Soome free(zfname);
192734b3a42SToomas Soome if (rawfd == -1)
193734b3a42SToomas Soome return (ENOENT);
194734b3a42SToomas Soome }
195199767f8SToomas Soome
196734b3a42SToomas Soome if (fstat(rawfd, &sb) < 0) {
197734b3a42SToomas Soome printf("zf_open: stat failed\n");
198734b3a42SToomas Soome close(rawfd);
199734b3a42SToomas Soome return (ENOENT);
200734b3a42SToomas Soome }
201734b3a42SToomas Soome if (!S_ISREG(sb.st_mode)) {
202734b3a42SToomas Soome close(rawfd);
203734b3a42SToomas Soome return (EISDIR); /* best guess */
204734b3a42SToomas Soome }
205734b3a42SToomas Soome
206734b3a42SToomas Soome /* Allocate a z_file structure, populate it */
207734b3a42SToomas Soome zf = malloc(sizeof (struct z_file));
208734b3a42SToomas Soome if (zf == NULL)
209734b3a42SToomas Soome return (ENOMEM);
210734b3a42SToomas Soome bzero(zf, sizeof (struct z_file));
211734b3a42SToomas Soome zf->zf_rawfd = rawfd;
212734b3a42SToomas Soome
213734b3a42SToomas Soome /* Verify that the file is gzipped */
214734b3a42SToomas Soome if (check_header(zf)) {
215734b3a42SToomas Soome close(zf->zf_rawfd);
216734b3a42SToomas Soome free(zf);
217734b3a42SToomas Soome return (EFTYPE);
218734b3a42SToomas Soome }
219199767f8SToomas Soome
220734b3a42SToomas Soome /* Initialise the inflation engine */
221734b3a42SToomas Soome if ((error = inflateInit2(&(zf->zf_zstream), -15)) != Z_OK) {
222734b3a42SToomas Soome printf("zf_open: inflateInit returned %d : %s\n", error,
223734b3a42SToomas Soome zf->zf_zstream.msg);
224734b3a42SToomas Soome close(zf->zf_rawfd);
225734b3a42SToomas Soome free(zf);
226734b3a42SToomas Soome return (EIO);
227734b3a42SToomas Soome }
228734b3a42SToomas Soome
229734b3a42SToomas Soome /* Looks OK, we'll take it */
230734b3a42SToomas Soome f->f_fsdata = zf;
231734b3a42SToomas Soome return (0);
232199767f8SToomas Soome }
233199767f8SToomas Soome
234199767f8SToomas Soome static int
zf_close(struct open_file * f)235199767f8SToomas Soome zf_close(struct open_file *f)
236199767f8SToomas Soome {
237734b3a42SToomas Soome struct z_file *zf = (struct z_file *)f->f_fsdata;
238734b3a42SToomas Soome
239734b3a42SToomas Soome inflateEnd(&(zf->zf_zstream));
240734b3a42SToomas Soome close(zf->zf_rawfd);
241734b3a42SToomas Soome free(zf);
242734b3a42SToomas Soome return (0);
243199767f8SToomas Soome }
244734b3a42SToomas Soome
245734b3a42SToomas Soome static int
zf_read(struct open_file * f,void * buf,size_t size,size_t * resid)246199767f8SToomas Soome zf_read(struct open_file *f, void *buf, size_t size, size_t *resid)
247199767f8SToomas Soome {
248734b3a42SToomas Soome struct z_file *zf = (struct z_file *)f->f_fsdata;
249734b3a42SToomas Soome int error;
250734b3a42SToomas Soome
251734b3a42SToomas Soome zf->zf_zstream.next_out = buf; /* where and how much */
252734b3a42SToomas Soome zf->zf_zstream.avail_out = size;
253734b3a42SToomas Soome
254734b3a42SToomas Soome while (zf->zf_zstream.avail_out && zf->zf_endseen == 0) {
255734b3a42SToomas Soome if ((zf->zf_zstream.avail_in == 0) && (zf_fill(zf) == -1)) {
256734b3a42SToomas Soome printf("zf_read: fill error\n");
257734b3a42SToomas Soome return (EIO);
258734b3a42SToomas Soome }
259734b3a42SToomas Soome if (zf->zf_zstream.avail_in == 0) { /* oops, unexpected EOF */
260734b3a42SToomas Soome printf("zf_read: unexpected EOF\n");
261734b3a42SToomas Soome if (zf->zf_zstream.avail_out == size)
262734b3a42SToomas Soome return (EIO);
263734b3a42SToomas Soome break;
264734b3a42SToomas Soome }
265734b3a42SToomas Soome
266734b3a42SToomas Soome /* decompression pass */
267734b3a42SToomas Soome error = inflate(&zf->zf_zstream, Z_SYNC_FLUSH);
268734b3a42SToomas Soome if (error == Z_STREAM_END) { /* EOF, all done */
269734b3a42SToomas Soome zf->zf_endseen = 1;
270734b3a42SToomas Soome break;
271734b3a42SToomas Soome }
272734b3a42SToomas Soome if (error != Z_OK) { /* argh, decompression error */
273734b3a42SToomas Soome printf("inflate: %s\n", zf->zf_zstream.msg);
274734b3a42SToomas Soome return (EIO);
275734b3a42SToomas Soome }
276199767f8SToomas Soome }
277734b3a42SToomas Soome if (resid != NULL)
278734b3a42SToomas Soome *resid = zf->zf_zstream.avail_out;
279734b3a42SToomas Soome return (0);
280199767f8SToomas Soome }
281199767f8SToomas Soome
282199767f8SToomas Soome static int
zf_rewind(struct open_file * f)283199767f8SToomas Soome zf_rewind(struct open_file *f)
284199767f8SToomas Soome {
285734b3a42SToomas Soome struct z_file *zf = (struct z_file *)f->f_fsdata;
286199767f8SToomas Soome
287734b3a42SToomas Soome if (lseek(zf->zf_rawfd, zf->zf_dataoffset, SEEK_SET) == -1)
288734b3a42SToomas Soome return (-1);
289734b3a42SToomas Soome zf->zf_zstream.avail_in = 0;
290734b3a42SToomas Soome zf->zf_zstream.next_in = NULL;
291734b3a42SToomas Soome zf->zf_endseen = 0;
292734b3a42SToomas Soome (void) inflateReset(&zf->zf_zstream);
293199767f8SToomas Soome
294734b3a42SToomas Soome return (0);
295199767f8SToomas Soome }
296199767f8SToomas Soome
297199767f8SToomas Soome static off_t
zf_seek(struct open_file * f,off_t offset,int where)298199767f8SToomas Soome zf_seek(struct open_file *f, off_t offset, int where)
299199767f8SToomas Soome {
300734b3a42SToomas Soome struct z_file *zf = (struct z_file *)f->f_fsdata;
301734b3a42SToomas Soome off_t target;
302734b3a42SToomas Soome char discard[16];
303734b3a42SToomas Soome
304734b3a42SToomas Soome switch (where) {
305734b3a42SToomas Soome case SEEK_SET:
306734b3a42SToomas Soome target = offset;
307734b3a42SToomas Soome break;
308734b3a42SToomas Soome case SEEK_CUR:
309734b3a42SToomas Soome target = offset + zf->zf_zstream.total_out;
310734b3a42SToomas Soome break;
311734b3a42SToomas Soome default:
312734b3a42SToomas Soome errno = EINVAL;
313734b3a42SToomas Soome return (-1);
314734b3a42SToomas Soome }
315734b3a42SToomas Soome
316734b3a42SToomas Soome /* rewind if required */
317734b3a42SToomas Soome if (target < zf->zf_zstream.total_out && zf_rewind(f) != 0)
318734b3a42SToomas Soome return (-1);
319734b3a42SToomas Soome
320734b3a42SToomas Soome /* skip forwards if required */
321734b3a42SToomas Soome while (target > zf->zf_zstream.total_out) {
322734b3a42SToomas Soome errno = zf_read(f, discard, min(sizeof (discard),
323734b3a42SToomas Soome target - zf->zf_zstream.total_out), NULL);
324734b3a42SToomas Soome if (errno != 0)
325734b3a42SToomas Soome return (-1);
326734b3a42SToomas Soome }
327734b3a42SToomas Soome /* This is where we are (be honest if we overshot) */
328734b3a42SToomas Soome return (zf->zf_zstream.total_out);
329199767f8SToomas Soome }
330199767f8SToomas Soome
331199767f8SToomas Soome
332199767f8SToomas Soome static int
zf_stat(struct open_file * f,struct stat * sb)333199767f8SToomas Soome zf_stat(struct open_file *f, struct stat *sb)
334199767f8SToomas Soome {
335734b3a42SToomas Soome struct z_file *zf = (struct z_file *)f->f_fsdata;
336734b3a42SToomas Soome int result;
337734b3a42SToomas Soome off_t pos1, pos2;
338734b3a42SToomas Soome uint32_t size;
339734b3a42SToomas Soome
340734b3a42SToomas Soome /* stat as normal, but indicate that size is unknown */
341734b3a42SToomas Soome if ((result = fstat(zf->zf_rawfd, sb)) == 0) {
342734b3a42SToomas Soome if (sb->st_size == -1)
343734b3a42SToomas Soome return (result);
344734b3a42SToomas Soome pos1 = lseek(zf->zf_rawfd, 0, SEEK_CUR);
345734b3a42SToomas Soome pos2 = lseek(zf->zf_rawfd, sb->st_size - 4, SEEK_SET);
346734b3a42SToomas Soome if (pos2 != -1) {
347734b3a42SToomas Soome if (read(zf->zf_rawfd, &size, 4) == 4)
348734b3a42SToomas Soome sb->st_size = (off_t)size;
349734b3a42SToomas Soome else
350734b3a42SToomas Soome sb->st_size = -1;
351734b3a42SToomas Soome } else
352734b3a42SToomas Soome sb->st_size = -1;
353734b3a42SToomas Soome
354734b3a42SToomas Soome pos1 = lseek(zf->zf_rawfd, pos1, SEEK_SET);
355734b3a42SToomas Soome }
356734b3a42SToomas Soome return (result);
357199767f8SToomas Soome }
358