1 /* $NetBSD: cd9660.c,v 1.5 1997/06/26 19:11:33 drochner Exp $ */
4 * Copyright (C) 1996 Wolfgang Solfrank.
5 * Copyright (C) 1996 TooLs GmbH.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by TooLs GmbH.
19 * 4. The name of TooLs GmbH may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 * Stand-alone ISO9660 file reading package.
40 * Note: This doesn't support Rock Ridge extensions, extended attributes,
41 * blocksizes other than 2048 bytes, multi-extent files, etc.
43 #include <sys/param.h>
45 #include <sys/dirent.h>
46 #include <fs/cd9660/iso.h>
47 #include <fs/cd9660/cd9660_rrip.h>
51 #define SUSP_CONTINUATION "CE"
52 #define SUSP_PRESENT "SP"
53 #define SUSP_STOP "ST"
54 #define SUSP_EXTREF "ER"
55 #define RRIP_NAME "NM"
59 u_char signature [ISODCL ( 5, 6)];
60 u_char len_skp [ISODCL ( 7, 7)]; /* 711 */
63 static int buf_read_file(struct open_file *f, char **buf_p,
65 static int cd9660_open(const char *path, struct open_file *f);
66 static int cd9660_close(struct open_file *f);
67 static int cd9660_read(struct open_file *f, void *buf, size_t size,
69 static off_t cd9660_seek(struct open_file *f, off_t offset, int where);
70 static int cd9660_stat(struct open_file *f, struct stat *sb);
71 static int cd9660_readdir(struct open_file *f, struct dirent *d);
72 static int dirmatch(struct open_file *f, const char *path,
73 struct iso_directory_record *dp, int use_rrip, int lenskip);
74 static int rrip_check(struct open_file *f, struct iso_directory_record *dp,
76 static char *rrip_lookup_name(struct open_file *f,
77 struct iso_directory_record *dp, int lenskip, size_t *len);
78 static ISO_SUSP_HEADER *susp_lookup_record(struct open_file *f,
79 const char *identifier, struct iso_directory_record *dp,
82 struct fs_ops cd9660_fsops = {
93 #define F_ISDIR 0x0001 /* Directory */
94 #define F_ROOTDIR 0x0002 /* Root directory */
95 #define F_RR 0x0004 /* Rock Ridge on this volume */
98 int f_flags; /* file flags */
99 off_t f_off; /* Current offset within file */
100 daddr_t f_bno; /* Starting block number */
101 off_t f_size; /* Size of file */
102 daddr_t f_buf_blkno; /* block number of data block */
103 char *f_buf; /* buffer for data block */
104 int f_susp_skip; /* len_skip for SUSP records */
108 char namlen [ISODCL( 1, 1)]; /* 711 */
109 char extlen [ISODCL( 2, 2)]; /* 711 */
110 char block [ISODCL( 3, 6)]; /* 732 */
111 char parent [ISODCL( 7, 8)]; /* 722 */
115 #define PTSIZE(pp) roundup(PTFIXSZ + isonum_711((pp)->namlen), 2)
117 #define cdb2devb(bno) ((bno) * ISO_DEFAULT_BLOCK_SIZE / DEV_BSIZE)
119 static ISO_SUSP_HEADER *
120 susp_lookup_record(struct open_file *f, const char *identifier,
121 struct iso_directory_record *dp, int lenskip)
123 static char susp_buffer[ISO_DEFAULT_BLOCK_SIZE];
130 p = dp->name + isonum_711(dp->name_len) + lenskip;
131 /* Names of even length have a padding byte after the name. */
132 if ((isonum_711(dp->name_len) & 1) == 0)
134 end = (char *)dp + isonum_711(dp->length);
135 while (p + 3 < end) {
136 sh = (ISO_SUSP_HEADER *)p;
137 if (bcmp(sh->type, identifier, 2) == 0)
139 if (bcmp(sh->type, SUSP_STOP, 2) == 0)
141 if (bcmp(sh->type, SUSP_CONTINUATION, 2) == 0) {
142 shc = (ISO_RRIP_CONT *)sh;
143 error = f->f_dev->dv_strategy(f->f_devdata, F_READ,
144 cdb2devb(isonum_733(shc->location)),
145 ISO_DEFAULT_BLOCK_SIZE, susp_buffer, &read);
147 /* Bail if it fails. */
148 if (error != 0 || read != ISO_DEFAULT_BLOCK_SIZE)
150 p = susp_buffer + isonum_733(shc->offset);
151 end = p + isonum_733(shc->length);
153 /* Ignore this record and skip to the next. */
154 p += isonum_711(sh->length);
156 /* Avoid infinite loops with corrupted file systems */
157 if (isonum_711(sh->length) == 0)
165 rrip_lookup_name(struct open_file *f, struct iso_directory_record *dp,
166 int lenskip, size_t *len)
173 p = (ISO_RRIP_ALTNAME *)susp_lookup_record(f, RRIP_NAME, dp, lenskip);
177 case ISO_SUSP_CFLAG_CURRENT:
180 case ISO_SUSP_CFLAG_PARENT:
184 *len = isonum_711(p->h.length) - 5;
185 return ((char *)p + 5);
188 * We don't handle hostnames or continued names as they are
189 * too hard, so just bail and use the default name.
196 rrip_check(struct open_file *f, struct iso_directory_record *dp, int *lenskip)
198 ISO_SUSP_PRESENT *sp;
202 /* First, see if we can find a SP field. */
203 p = dp->name + isonum_711(dp->name_len);
204 if (p > (char *)dp + isonum_711(dp->length))
206 sp = (ISO_SUSP_PRESENT *)p;
207 if (bcmp(sp->h.type, SUSP_PRESENT, 2) != 0)
209 if (isonum_711(sp->h.length) != sizeof(ISO_SUSP_PRESENT))
211 if (sp->signature[0] != 0xbe || sp->signature[1] != 0xef)
213 *lenskip = isonum_711(sp->len_skp);
216 * Now look for an ER field. If RRIP is present, then there must
217 * be at least one of these. It would be more pedantic to walk
218 * through the list of fields looking for a Rock Ridge ER field.
220 er = (ISO_RRIP_EXTREF *)susp_lookup_record(f, SUSP_EXTREF, dp, 0);
227 dirmatch(struct open_file *f, const char *path, struct iso_directory_record *dp,
228 int use_rrip, int lenskip)
235 cp = rrip_lookup_name(f, dp, lenskip, &len);
239 len = isonum_711(dp->name_len);
244 for (i = len; --i >= 0; path++, cp++) {
245 if (!*path || *path == '/')
249 if (!icase && toupper(*path) == *cp)
253 if (*path && *path != '/')
256 * Allow stripping of trailing dots and the version number.
257 * Note that this will find the first instead of the last version
260 if (i >= 0 && (*cp == ';' || *cp == '.')) {
261 /* This is to prevent matching of numeric extensions */
262 if (*cp == '.' && cp[1] != ';')
265 if (*++cp != ';' && (*cp < '0' || *cp > '9'))
272 cd9660_open(const char *path, struct open_file *f)
274 struct file *fp = NULL;
276 struct iso_primary_descriptor *vd;
277 size_t buf_size, read, dsize, off;
279 struct iso_directory_record rec;
280 struct iso_directory_record *dp = NULL;
281 int rc, first, use_rrip, lenskip;
283 /* First find the volume descriptor */
284 buf = malloc(buf_size = ISO_DEFAULT_BLOCK_SIZE);
286 for (bno = 16;; bno++) {
288 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
289 ISO_DEFAULT_BLOCK_SIZE, buf, &read);
292 if (read != ISO_DEFAULT_BLOCK_SIZE) {
297 if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
299 if (isonum_711(vd->type) == ISO_VD_END)
301 if (isonum_711(vd->type) == ISO_VD_PRIMARY)
304 if (isonum_723(vd->logical_block_size) != ISO_DEFAULT_BLOCK_SIZE)
307 bcopy(vd->root_directory_record, &rec, sizeof(rec));
308 if (*path == '/') path++; /* eat leading '/' */
314 bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
315 dsize = isonum_733(rec.size);
319 while (off < dsize) {
320 if ((off % ISO_DEFAULT_BLOCK_SIZE) == 0) {
322 rc = f->f_dev->dv_strategy
323 (f->f_devdata, F_READ,
324 cdb2devb(bno + boff),
325 ISO_DEFAULT_BLOCK_SIZE,
329 if (read != ISO_DEFAULT_BLOCK_SIZE) {
334 dp = (struct iso_directory_record *) buf;
336 if (isonum_711(dp->length) == 0) {
337 /* skip to next block, if any */
338 off = boff * ISO_DEFAULT_BLOCK_SIZE;
342 /* See if RRIP is in use. */
344 use_rrip = rrip_check(f, dp, &lenskip);
346 if (dirmatch(f, path, dp, use_rrip,
347 first ? 0 : lenskip)) {
353 dp = (struct iso_directory_record *)
354 ((char *) dp + isonum_711(dp->length));
355 /* If the new block has zero length, it is padding. */
356 if (isonum_711(dp->length) == 0) {
357 /* Skip to next block, if any. */
358 off = boff * ISO_DEFAULT_BLOCK_SIZE;
361 off += isonum_711(dp->length);
369 while (*path && *path != '/') /* look for next component */
371 if (*path) path++; /* skip '/' */
374 /* allocate file system specific data structure */
375 fp = malloc(sizeof(struct file));
376 bzero(fp, sizeof(struct file));
377 f->f_fsdata = (void *)fp;
379 if ((isonum_711(rec.flags) & 2) != 0) {
380 fp->f_flags = F_ISDIR;
383 fp->f_flags |= F_ROOTDIR;
385 /* Check for Rock Ridge since we didn't in the loop above. */
386 bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
388 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
389 ISO_DEFAULT_BLOCK_SIZE, buf, &read);
392 if (read != ISO_DEFAULT_BLOCK_SIZE) {
396 dp = (struct iso_directory_record *)buf;
397 use_rrip = rrip_check(f, dp, &lenskip);
401 fp->f_susp_skip = lenskip;
404 fp->f_bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
405 fp->f_size = isonum_733(rec.size);
419 cd9660_close(struct open_file *f)
421 struct file *fp = (struct file *)f->f_fsdata;
430 buf_read_file(struct open_file *f, char **buf_p, size_t *size_p)
432 struct file *fp = (struct file *)f->f_fsdata;
433 daddr_t blkno, blkoff;
437 blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE + fp->f_bno;
438 blkoff = fp->f_off % ISO_DEFAULT_BLOCK_SIZE;
440 if (blkno != fp->f_buf_blkno) {
441 if (fp->f_buf == (char *)0)
442 fp->f_buf = malloc(ISO_DEFAULT_BLOCK_SIZE);
445 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ,
446 cdb2devb(blkno), ISO_DEFAULT_BLOCK_SIZE,
450 if (read != ISO_DEFAULT_BLOCK_SIZE)
453 fp->f_buf_blkno = blkno;
456 *buf_p = fp->f_buf + blkoff;
457 *size_p = ISO_DEFAULT_BLOCK_SIZE - blkoff;
459 if (*size_p > fp->f_size - fp->f_off)
460 *size_p = fp->f_size - fp->f_off;
465 cd9660_read(struct open_file *f, void *start, size_t size, size_t *resid)
467 struct file *fp = (struct file *)f->f_fsdata;
469 size_t buf_size, csize;
474 if (fp->f_off < 0 || fp->f_off >= fp->f_size)
477 rc = buf_read_file(f, &buf, &buf_size);
481 csize = size > buf_size ? buf_size : size;
482 bcopy(buf, addr, csize);
494 cd9660_readdir(struct open_file *f, struct dirent *d)
496 struct file *fp = (struct file *)f->f_fsdata;
497 struct iso_directory_record *ep;
498 size_t buf_size, reclen, namelen;
504 if (fp->f_off >= fp->f_size)
506 error = buf_read_file(f, &buf, &buf_size);
509 ep = (struct iso_directory_record *)buf;
511 if (isonum_711(ep->length) == 0) {
514 /* skip to next block, if any */
515 blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE;
516 fp->f_off = (blkno + 1) * ISO_DEFAULT_BLOCK_SIZE;
520 if (fp->f_flags & F_RR) {
521 if (fp->f_flags & F_ROOTDIR && fp->f_off == 0)
524 lenskip = fp->f_susp_skip;
525 name = rrip_lookup_name(f, ep, lenskip, &namelen);
529 namelen = isonum_711(ep->name_len);
532 if (ep->name[0] == 0)
534 else if (ep->name[0] == 1) {
540 reclen = sizeof(struct dirent) - (MAXNAMLEN+1) + namelen + 1;
541 reclen = (reclen + 3) & ~3;
543 d->d_fileno = isonum_733(ep->extent);
544 d->d_reclen = reclen;
545 if (isonum_711(ep->flags) & 2)
549 d->d_namlen = namelen;
551 bcopy(name, d->d_name, d->d_namlen);
552 d->d_name[d->d_namlen] = 0;
554 fp->f_off += isonum_711(ep->length);
559 cd9660_seek(struct open_file *f, off_t offset, int where)
561 struct file *fp = (struct file *)f->f_fsdata;
571 fp->f_off = fp->f_size - offset;
580 cd9660_stat(struct open_file *f, struct stat *sb)
582 struct file *fp = (struct file *)f->f_fsdata;
584 /* only important stuff */
585 sb->st_mode = S_IRUSR | S_IRGRP | S_IROTH;
586 if (fp->f_flags & F_ISDIR)
587 sb->st_mode |= S_IFDIR;
589 sb->st_mode |= S_IFREG;
590 sb->st_uid = sb->st_gid = 0;
591 sb->st_size = fp->f_size;