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>
46 #include <sys/dirent.h>
47 #include <fs/cd9660/iso.h>
48 #include <fs/cd9660/cd9660_rrip.h>
52 #define SUSP_CONTINUATION "CE"
53 #define SUSP_PRESENT "SP"
54 #define SUSP_STOP "ST"
55 #define SUSP_EXTREF "ER"
56 #define RRIP_NAME "NM"
60 u_char signature [ISODCL ( 5, 6)];
61 u_char len_skp [ISODCL ( 7, 7)]; /* 711 */
64 static int buf_read_file(struct open_file *f, char **buf_p,
66 static int cd9660_open(const char *path, struct open_file *f);
67 static int cd9660_close(struct open_file *f);
68 static int cd9660_read(struct open_file *f, void *buf, size_t size,
70 static off_t cd9660_seek(struct open_file *f, off_t offset, int where);
71 static int cd9660_stat(struct open_file *f, struct stat *sb);
72 static int cd9660_readdir(struct open_file *f, struct dirent *d);
73 static int dirmatch(struct open_file *f, const char *path,
74 struct iso_directory_record *dp, int use_rrip, int lenskip);
75 static int rrip_check(struct open_file *f, struct iso_directory_record *dp,
77 static char *rrip_lookup_name(struct open_file *f,
78 struct iso_directory_record *dp, int lenskip, size_t *len);
79 static ISO_SUSP_HEADER *susp_lookup_record(struct open_file *f,
80 const char *identifier, struct iso_directory_record *dp,
83 struct fs_ops cd9660_fsops = {
94 #define F_ISDIR 0x0001 /* Directory */
95 #define F_ROOTDIR 0x0002 /* Root directory */
96 #define F_RR 0x0004 /* Rock Ridge on this volume */
99 int f_flags; /* file flags */
100 off_t f_off; /* Current offset within file */
101 daddr_t f_bno; /* Starting block number */
102 off_t f_size; /* Size of file */
103 daddr_t f_buf_blkno; /* block number of data block */
104 char *f_buf; /* buffer for data block */
105 int f_susp_skip; /* len_skip for SUSP records */
109 char namlen [ISODCL( 1, 1)]; /* 711 */
110 char extlen [ISODCL( 2, 2)]; /* 711 */
111 char block [ISODCL( 3, 6)]; /* 732 */
112 char parent [ISODCL( 7, 8)]; /* 722 */
116 #define PTSIZE(pp) roundup(PTFIXSZ + isonum_711((pp)->namlen), 2)
118 #define cdb2devb(bno) ((bno) * ISO_DEFAULT_BLOCK_SIZE / DEV_BSIZE)
120 static ISO_SUSP_HEADER *
121 susp_lookup_record(struct open_file *f, const char *identifier,
122 struct iso_directory_record *dp, int lenskip)
124 static char susp_buffer[ISO_DEFAULT_BLOCK_SIZE];
131 p = dp->name + isonum_711(dp->name_len) + lenskip;
132 /* Names of even length have a padding byte after the name. */
133 if ((isonum_711(dp->name_len) & 1) == 0)
135 end = (char *)dp + isonum_711(dp->length);
136 while (p + 3 < end) {
137 sh = (ISO_SUSP_HEADER *)p;
138 if (bcmp(sh->type, identifier, 2) == 0)
140 if (bcmp(sh->type, SUSP_STOP, 2) == 0)
142 if (bcmp(sh->type, SUSP_CONTINUATION, 2) == 0) {
143 shc = (ISO_RRIP_CONT *)sh;
144 error = f->f_dev->dv_strategy(f->f_devdata, F_READ,
145 cdb2devb(isonum_733(shc->location)),
146 ISO_DEFAULT_BLOCK_SIZE, susp_buffer, &read);
148 /* Bail if it fails. */
149 if (error != 0 || read != ISO_DEFAULT_BLOCK_SIZE)
151 p = susp_buffer + isonum_733(shc->offset);
152 end = p + isonum_733(shc->length);
154 /* Ignore this record and skip to the next. */
155 p += isonum_711(sh->length);
157 /* Avoid infinite loops with corrupted file systems */
158 if (isonum_711(sh->length) == 0)
166 rrip_lookup_name(struct open_file *f, struct iso_directory_record *dp,
167 int lenskip, size_t *len)
174 p = (ISO_RRIP_ALTNAME *)susp_lookup_record(f, RRIP_NAME, dp, lenskip);
178 case ISO_SUSP_CFLAG_CURRENT:
181 case ISO_SUSP_CFLAG_PARENT:
185 *len = isonum_711(p->h.length) - 5;
186 return ((char *)p + 5);
189 * We don't handle hostnames or continued names as they are
190 * too hard, so just bail and use the default name.
197 rrip_check(struct open_file *f, struct iso_directory_record *dp, int *lenskip)
199 ISO_SUSP_PRESENT *sp;
203 /* First, see if we can find a SP field. */
204 p = dp->name + isonum_711(dp->name_len);
205 if (p > (char *)dp + isonum_711(dp->length))
207 sp = (ISO_SUSP_PRESENT *)p;
208 if (bcmp(sp->h.type, SUSP_PRESENT, 2) != 0)
210 if (isonum_711(sp->h.length) != sizeof(ISO_SUSP_PRESENT))
212 if (sp->signature[0] != 0xbe || sp->signature[1] != 0xef)
214 *lenskip = isonum_711(sp->len_skp);
217 * Now look for an ER field. If RRIP is present, then there must
218 * be at least one of these. It would be more pedantic to walk
219 * through the list of fields looking for a Rock Ridge ER field.
221 er = (ISO_RRIP_EXTREF *)susp_lookup_record(f, SUSP_EXTREF, dp, 0);
228 dirmatch(struct open_file *f, const char *path, struct iso_directory_record *dp,
229 int use_rrip, int lenskip)
236 cp = rrip_lookup_name(f, dp, lenskip, &len);
240 len = isonum_711(dp->name_len);
246 sep = strchr(path, '/');
256 for (i = len; --i >= 0; path++, cp++) {
257 if (!*path || *path == '/')
261 if (!icase && toupper(*path) == *cp)
265 if (*path && *path != '/')
268 * Allow stripping of trailing dots and the version number.
269 * Note that this will find the first instead of the last version
272 if (i >= 0 && (*cp == ';' || *cp == '.')) {
273 /* This is to prevent matching of numeric extensions */
274 if (*cp == '.' && cp[1] != ';')
277 if (*++cp != ';' && (*cp < '0' || *cp > '9'))
284 cd9660_open(const char *path, struct open_file *f)
286 struct file *fp = NULL;
288 struct iso_primary_descriptor *vd;
289 size_t read, dsize, off;
291 struct iso_directory_record rec;
292 struct iso_directory_record *dp = NULL;
293 int rc, first, use_rrip, lenskip;
296 /* First find the volume descriptor */
297 buf = malloc(MAX(ISO_DEFAULT_BLOCK_SIZE,
298 sizeof(struct iso_primary_descriptor)));
300 for (bno = 16;; bno++) {
302 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
303 ISO_DEFAULT_BLOCK_SIZE, buf, &read);
306 if (read != ISO_DEFAULT_BLOCK_SIZE) {
311 if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
313 if (isonum_711(vd->type) == ISO_VD_END)
315 if (isonum_711(vd->type) == ISO_VD_PRIMARY)
318 if (isonum_723(vd->logical_block_size) != ISO_DEFAULT_BLOCK_SIZE)
321 bcopy(vd->root_directory_record, &rec, sizeof(rec));
322 if (*path == '/') path++; /* eat leading '/' */
328 bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
329 dsize = isonum_733(rec.size);
333 while (off < dsize) {
334 if ((off % ISO_DEFAULT_BLOCK_SIZE) == 0) {
336 rc = f->f_dev->dv_strategy
337 (f->f_devdata, F_READ,
338 cdb2devb(bno + boff),
339 ISO_DEFAULT_BLOCK_SIZE,
343 if (read != ISO_DEFAULT_BLOCK_SIZE) {
348 dp = (struct iso_directory_record *) buf;
350 if (isonum_711(dp->length) == 0) {
351 /* skip to next block, if any */
352 off = boff * ISO_DEFAULT_BLOCK_SIZE;
356 /* See if RRIP is in use. */
358 use_rrip = rrip_check(f, dp, &lenskip);
360 if (dirmatch(f, path, dp, use_rrip,
361 first ? 0 : lenskip)) {
367 dp = (struct iso_directory_record *)
368 ((char *) dp + isonum_711(dp->length));
369 /* If the new block has zero length, it is padding. */
370 if (isonum_711(dp->length) == 0) {
371 /* Skip to next block, if any. */
372 off = boff * ISO_DEFAULT_BLOCK_SIZE;
375 off += isonum_711(dp->length);
383 while (*path && *path != '/') /* look for next component */
386 if (*path) /* this component was directory */
390 path++; /* skip '/' */
392 if (*path) /* We do have next component. */
397 * if the path had trailing / but the path does point to file,
398 * report the error ENOTDIR.
400 if (isdir == true && (isonum_711(rec.flags) & 2) == 0) {
405 /* allocate file system specific data structure */
406 fp = malloc(sizeof(struct file));
407 bzero(fp, sizeof(struct file));
408 f->f_fsdata = (void *)fp;
410 if ((isonum_711(rec.flags) & 2) != 0) {
411 fp->f_flags = F_ISDIR;
414 fp->f_flags |= F_ROOTDIR;
416 /* Check for Rock Ridge since we didn't in the loop above. */
417 bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
419 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
420 ISO_DEFAULT_BLOCK_SIZE, buf, &read);
423 if (read != ISO_DEFAULT_BLOCK_SIZE) {
427 dp = (struct iso_directory_record *)buf;
428 use_rrip = rrip_check(f, dp, &lenskip);
432 fp->f_susp_skip = lenskip;
435 fp->f_bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
436 fp->f_size = isonum_733(rec.size);
449 cd9660_close(struct open_file *f)
451 struct file *fp = (struct file *)f->f_fsdata;
460 buf_read_file(struct open_file *f, char **buf_p, size_t *size_p)
462 struct file *fp = (struct file *)f->f_fsdata;
463 daddr_t blkno, blkoff;
467 blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE + fp->f_bno;
468 blkoff = fp->f_off % ISO_DEFAULT_BLOCK_SIZE;
470 if (blkno != fp->f_buf_blkno) {
471 if (fp->f_buf == (char *)0)
472 fp->f_buf = malloc(ISO_DEFAULT_BLOCK_SIZE);
475 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ,
476 cdb2devb(blkno), ISO_DEFAULT_BLOCK_SIZE,
480 if (read != ISO_DEFAULT_BLOCK_SIZE)
483 fp->f_buf_blkno = blkno;
486 *buf_p = fp->f_buf + blkoff;
487 *size_p = ISO_DEFAULT_BLOCK_SIZE - blkoff;
489 if (*size_p > fp->f_size - fp->f_off)
490 *size_p = fp->f_size - fp->f_off;
495 cd9660_read(struct open_file *f, void *start, size_t size, size_t *resid)
497 struct file *fp = (struct file *)f->f_fsdata;
499 size_t buf_size, csize;
504 if (fp->f_off < 0 || fp->f_off >= fp->f_size)
507 rc = buf_read_file(f, &buf, &buf_size);
511 csize = size > buf_size ? buf_size : size;
512 bcopy(buf, addr, csize);
524 cd9660_readdir(struct open_file *f, struct dirent *d)
526 struct file *fp = (struct file *)f->f_fsdata;
527 struct iso_directory_record *ep;
528 size_t buf_size, reclen, namelen;
534 if (fp->f_off >= fp->f_size)
536 error = buf_read_file(f, &buf, &buf_size);
539 ep = (struct iso_directory_record *)buf;
541 if (isonum_711(ep->length) == 0) {
544 /* skip to next block, if any */
545 blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE;
546 fp->f_off = (blkno + 1) * ISO_DEFAULT_BLOCK_SIZE;
550 if (fp->f_flags & F_RR) {
551 if (fp->f_flags & F_ROOTDIR && fp->f_off == 0)
554 lenskip = fp->f_susp_skip;
555 name = rrip_lookup_name(f, ep, lenskip, &namelen);
559 namelen = isonum_711(ep->name_len);
562 if (ep->name[0] == 0)
564 else if (ep->name[0] == 1) {
570 reclen = sizeof(struct dirent) - (MAXNAMLEN+1) + namelen + 1;
571 reclen = (reclen + 3) & ~3;
573 d->d_fileno = isonum_733(ep->extent);
574 d->d_reclen = reclen;
575 if (isonum_711(ep->flags) & 2)
579 d->d_namlen = namelen;
581 bcopy(name, d->d_name, d->d_namlen);
582 d->d_name[d->d_namlen] = 0;
584 fp->f_off += isonum_711(ep->length);
589 cd9660_seek(struct open_file *f, off_t offset, int where)
591 struct file *fp = (struct file *)f->f_fsdata;
601 fp->f_off = fp->f_size - offset;
610 cd9660_stat(struct open_file *f, struct stat *sb)
612 struct file *fp = (struct file *)f->f_fsdata;
614 /* only important stuff */
615 sb->st_mode = S_IRUSR | S_IRGRP | S_IROTH;
616 if (fp->f_flags & F_ISDIR)
617 sb->st_mode |= S_IFDIR;
619 sb->st_mode |= S_IFREG;
620 sb->st_uid = sb->st_gid = 0;
621 sb->st_size = fp->f_size;