2 * Copyright (C) 1996 Wolfgang Solfrank.
3 * Copyright (C) 1996 TooLs GmbH.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by TooLs GmbH.
17 * 4. The name of TooLs GmbH may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 * $NetBSD: cd9660.c,v 1.5 1997/06/26 19:11:33 drochner Exp $
32 * $FreeBSD: src/lib/libstand/cd9660.c,v 1.4.2.4 2001/12/21 22:17:44 jhb Exp $
36 * Stand-alone ISO9660 file reading package.
38 * Note: This doesn't support Rock Ridge extensions, extended attributes,
39 * blocksizes other than 2048 bytes, multi-extent files, etc.
41 #include <sys/param.h>
43 #include <sys/dirent.h>
44 #include <isofs/cd9660/iso.h>
45 #include <isofs/cd9660/cd9660_rrip.h>
49 #define SUSP_CONTINUATION "CE"
50 #define SUSP_PRESENT "SP"
51 #define SUSP_STOP "ST"
52 #define SUSP_EXTREF "ER"
53 #define RRIP_NAME "NM"
57 u_char signature [ISODCL ( 5, 6)];
58 u_char len_skp [ISODCL ( 7, 7)]; /* 711 */
61 static int buf_read_file(struct open_file *f, char **buf_p,
63 static int cd9660_open(const char *path, struct open_file *f);
64 static int cd9660_close(struct open_file *f);
65 static int cd9660_read(struct open_file *f, void *buf, size_t size,
67 static int cd9660_write(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 u_daddr_t f_bno; /* Starting block number */
101 off_t f_size; /* Size of file */
102 u_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 /* XXX these should be in the system headers */
121 isonum_722(u_char *p)
123 return (*p << 8)|p[1];
127 isonum_732(u_char *p)
129 return (*p << 24)|(p[1] << 16)|(p[2] << 8)|p[3];
132 static ISO_SUSP_HEADER *
133 susp_lookup_record(struct open_file *f, const char *identifier,
134 struct iso_directory_record *dp, int lenskip)
136 static char susp_buffer[ISO_DEFAULT_BLOCK_SIZE];
143 p = dp->name + isonum_711(dp->name_len) + lenskip;
144 /* Names of even length have a padding byte after the name. */
145 if ((isonum_711(dp->name_len) & 1) == 0)
147 end = (char *)dp + isonum_711(dp->length);
148 while (p + 3 < end) {
149 sh = (ISO_SUSP_HEADER *)p;
150 if (bcmp(sh->type, identifier, 2) == 0)
152 if (bcmp(sh->type, SUSP_STOP, 2) == 0)
154 if (bcmp(sh->type, SUSP_CONTINUATION, 2) == 0) {
155 shc = (ISO_RRIP_CONT *)sh;
156 error = f->f_dev->dv_strategy(f->f_devdata, F_READ,
157 cdb2devb(isonum_733(shc->location)),
158 ISO_DEFAULT_BLOCK_SIZE, susp_buffer, &read);
160 /* Bail if it fails. */
161 if (error != 0 || read != ISO_DEFAULT_BLOCK_SIZE)
163 p = susp_buffer + isonum_733(shc->offset);
164 end = p + isonum_733(shc->length);
166 /* Ignore this record and skip to the next. */
167 p += isonum_711(sh->length);
173 rrip_lookup_name(struct open_file *f, struct iso_directory_record *dp,
174 int lenskip, size_t *len)
181 p = (ISO_RRIP_ALTNAME *)susp_lookup_record(f, RRIP_NAME, dp, lenskip);
185 case ISO_SUSP_CFLAG_CURRENT:
188 case ISO_SUSP_CFLAG_PARENT:
192 *len = isonum_711(p->h.length) - 5;
193 return ((char *)p + 5);
196 * We don't handle hostnames or continued names as they are
197 * too hard, so just bail and use the default name.
204 rrip_check(struct open_file *f, struct iso_directory_record *dp, int *lenskip)
206 ISO_SUSP_PRESENT *sp;
210 /* First, see if we can find a SP field. */
211 p = dp->name + isonum_711(dp->name_len);
212 if (p > (char *)dp + isonum_711(dp->length))
214 sp = (ISO_SUSP_PRESENT *)p;
215 if (bcmp(sp->h.type, SUSP_PRESENT, 2) != 0)
217 if (isonum_711(sp->h.length) != sizeof(ISO_SUSP_PRESENT))
219 if (sp->signature[0] != 0xbe || sp->signature[1] != 0xef)
221 *lenskip = isonum_711(sp->len_skp);
224 * Now look for an ER field. If RRIP is present, then there must
225 * be at least one of these. It would be more pedantic to walk
226 * through the list of fields looking for a Rock Ridge ER field.
228 er = (ISO_RRIP_EXTREF *)susp_lookup_record(f, SUSP_EXTREF, dp, 0);
235 dirmatch(struct open_file *f, const char *path, struct iso_directory_record *dp,
236 int use_rrip, int lenskip)
243 cp = rrip_lookup_name(f, dp, lenskip, &len);
247 len = isonum_711(dp->name_len);
252 for (i = len; --i >= 0; path++, cp++) {
253 if (!*path || *path == '/')
257 if (!icase && toupper(*path) == *cp)
261 if (*path && *path != '/')
265 * Allow stripping of trailing dots and the version number.
267 * Note that this will find the first instead of the last version
268 * of a file unless explicitly specified.
270 * For any inexact matches we ignore everything after and including
271 * the semicolon in the directory entry name, assuming it is a
272 * version number whether it is or not.
276 return 1; /* ignore version */
277 if (cp[0] == '.' && i == 0)
278 return 1; /* ignore trailing dot */
279 if (cp[0] == '.' && i > 0 && cp[1] == ';')
280 return 1; /* ignore trailing dot w/ version */
281 return 0; /* else mismatch */
287 cd9660_open(const char *path, struct open_file *f)
289 struct file *fp = NULL;
291 struct iso_primary_descriptor *vd;
292 size_t buf_size, read, dsize, off;
294 struct iso_directory_record rec;
295 struct iso_directory_record *dp = NULL;
296 int rc, first, use_rrip, lenskip;
298 /* First find the volume descriptor */
299 buf = malloc(buf_size = ISO_DEFAULT_BLOCK_SIZE);
301 for (bno = 16;; bno++) {
303 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
304 ISO_DEFAULT_BLOCK_SIZE, buf, &read);
307 if (read != ISO_DEFAULT_BLOCK_SIZE) {
312 if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
314 if (isonum_711(vd->type) == ISO_VD_END)
316 if (isonum_711(vd->type) == ISO_VD_PRIMARY)
319 if (isonum_723(vd->logical_block_size) != ISO_DEFAULT_BLOCK_SIZE)
322 rec = *(struct iso_directory_record *) vd->root_directory_record;
323 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 off += isonum_711(dp->length);
377 while (*path && *path != '/') /* look for next component */
379 if (*path == '/') { /* skip /, make sure is dir */
381 if (*path && (isonum_711(dp->flags) & 2) == 0) {
382 rc = ENOENT; /* not directory */
388 /* allocate file system specific data structure */
389 fp = malloc(sizeof(struct file));
390 bzero(fp, sizeof(struct file));
391 f->f_fsdata = (void *)fp;
393 if ((isonum_711(rec.flags) & 2) != 0) {
394 fp->f_flags = F_ISDIR;
397 fp->f_flags |= F_ROOTDIR;
399 /* Check for Rock Ridge since we didn't in the loop above. */
400 bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
402 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
403 ISO_DEFAULT_BLOCK_SIZE, buf, &read);
406 if (read != ISO_DEFAULT_BLOCK_SIZE) {
410 dp = (struct iso_directory_record *)buf;
411 use_rrip = rrip_check(f, dp, &lenskip);
415 fp->f_susp_skip = lenskip;
418 fp->f_bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
419 fp->f_size = isonum_733(rec.size);
434 cd9660_close(struct open_file *f)
436 struct file *fp = (struct file *)f->f_fsdata;
446 buf_read_file(struct open_file *f, char **buf_p, size_t *size_p)
448 struct file *fp = (struct file *)f->f_fsdata;
449 u_daddr_t blkno, blkoff;
453 blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE + fp->f_bno;
454 blkoff = fp->f_off % ISO_DEFAULT_BLOCK_SIZE;
456 if (blkno != fp->f_buf_blkno) {
457 if (fp->f_buf == NULL)
458 fp->f_buf = malloc(ISO_DEFAULT_BLOCK_SIZE);
461 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ,
462 cdb2devb(blkno), ISO_DEFAULT_BLOCK_SIZE, fp->f_buf, &read);
465 if (read != ISO_DEFAULT_BLOCK_SIZE)
468 fp->f_buf_blkno = blkno;
471 *buf_p = fp->f_buf + blkoff;
472 *size_p = ISO_DEFAULT_BLOCK_SIZE - blkoff;
474 if (*size_p > fp->f_size - fp->f_off)
475 *size_p = fp->f_size - fp->f_off;
480 cd9660_read(struct open_file *f, void *start, size_t size, size_t *resid)
482 struct file *fp = (struct file *)f->f_fsdata;
484 size_t buf_size, csize;
489 if (fp->f_off < 0 || fp->f_off >= fp->f_size)
492 rc = buf_read_file(f, &buf, &buf_size);
496 csize = size > buf_size ? buf_size : size;
497 bcopy(buf, addr, csize);
509 cd9660_readdir(struct open_file *f, struct dirent *d)
511 struct file *fp = (struct file *)f->f_fsdata;
512 struct iso_directory_record *ep;
513 size_t buf_size, reclen, namelen;
519 if (fp->f_off >= fp->f_size)
521 error = buf_read_file(f, &buf, &buf_size);
524 ep = (struct iso_directory_record *)buf;
526 if (isonum_711(ep->length) == 0) {
529 /* skip to next block, if any */
530 blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE;
531 fp->f_off = (blkno + 1) * ISO_DEFAULT_BLOCK_SIZE;
535 if (fp->f_flags & F_RR) {
536 if (fp->f_flags & F_ROOTDIR && fp->f_off == 0)
539 lenskip = fp->f_susp_skip;
540 name = rrip_lookup_name(f, ep, lenskip, &namelen);
544 namelen = isonum_711(ep->name_len);
547 if (ep->name[0] == 0)
549 else if (ep->name[0] == 1) {
555 reclen = _DIRENT_RECLEN(namelen);
557 d->d_ino = isonum_733(ep->extent);
558 if (isonum_711(ep->flags) & 2)
562 d->d_namlen = namelen;
564 bcopy(name, d->d_name, d->d_namlen);
565 d->d_name[d->d_namlen] = 0;
567 fp->f_off += isonum_711(ep->length);
572 cd9660_write(struct open_file *f, void *start, size_t size, size_t *resid)
578 cd9660_seek(struct open_file *f, off_t offset, int where)
580 struct file *fp = (struct file *)f->f_fsdata;
590 fp->f_off = fp->f_size - offset;
599 cd9660_stat(struct open_file *f, struct stat *sb)
601 struct file *fp = (struct file *)f->f_fsdata;
603 /* only important stuff */
604 sb->st_mode = S_IRUSR | S_IRGRP | S_IROTH;
605 if (fp->f_flags & F_ISDIR)
606 sb->st_mode |= S_IFDIR;
608 sb->st_mode |= S_IFREG;
609 sb->st_uid = sb->st_gid = 0;
610 sb->st_size = fp->f_size;