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 $
33 * $DragonFly: src/lib/libstand/cd9660.c,v 1.4 2003/12/01 08:52:20 dillon Exp $
37 * Stand-alone ISO9660 file reading package.
39 * Note: This doesn't support Rock Ridge extensions, extended attributes,
40 * blocksizes other than 2048 bytes, multi-extent files, etc.
42 #include <sys/param.h>
44 #include <sys/dirent.h>
45 #include <isofs/cd9660/iso.h>
46 #include <isofs/cd9660/cd9660_rrip.h>
50 #define SUSP_CONTINUATION "CE"
51 #define SUSP_PRESENT "SP"
52 #define SUSP_STOP "ST"
53 #define SUSP_EXTREF "ER"
54 #define RRIP_NAME "NM"
58 u_char signature [ISODCL ( 5, 6)];
59 u_char len_skp [ISODCL ( 7, 7)]; /* 711 */
62 static int buf_read_file(struct open_file *f, char **buf_p,
64 static int cd9660_open(const char *path, struct open_file *f);
65 static int cd9660_close(struct open_file *f);
66 static int cd9660_read(struct open_file *f, void *buf, size_t size,
68 static int cd9660_write(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 /* XXX these should be in the system headers */
125 return (*p << 8)|p[1];
132 return (*p << 24)|(p[1] << 16)|(p[2] << 8)|p[3];
135 static ISO_SUSP_HEADER *
136 susp_lookup_record(struct open_file *f, const char *identifier,
137 struct iso_directory_record *dp, int lenskip)
139 static char susp_buffer[ISO_DEFAULT_BLOCK_SIZE];
146 p = dp->name + isonum_711(dp->name_len) + lenskip;
147 /* Names of even length have a padding byte after the name. */
148 if ((isonum_711(dp->name_len) & 1) == 0)
150 end = (char *)dp + isonum_711(dp->length);
151 while (p + 3 < end) {
152 sh = (ISO_SUSP_HEADER *)p;
153 if (bcmp(sh->type, identifier, 2) == 0)
155 if (bcmp(sh->type, SUSP_STOP, 2) == 0)
157 if (bcmp(sh->type, SUSP_CONTINUATION, 2) == 0) {
158 shc = (ISO_RRIP_CONT *)sh;
159 error = f->f_dev->dv_strategy(f->f_devdata, F_READ,
160 cdb2devb(isonum_733(shc->location)),
161 ISO_DEFAULT_BLOCK_SIZE, susp_buffer, &read);
163 /* Bail if it fails. */
164 if (error != 0 || read != ISO_DEFAULT_BLOCK_SIZE)
166 p = susp_buffer + isonum_733(shc->offset);
167 end = p + isonum_733(shc->length);
169 /* Ignore this record and skip to the next. */
170 p += isonum_711(sh->length);
176 rrip_lookup_name(struct open_file *f, struct iso_directory_record *dp,
177 int lenskip, size_t *len)
184 p = (ISO_RRIP_ALTNAME *)susp_lookup_record(f, RRIP_NAME, dp, lenskip);
188 case ISO_SUSP_CFLAG_CURRENT:
191 case ISO_SUSP_CFLAG_PARENT:
195 *len = isonum_711(p->h.length) - 5;
196 return ((char *)p + 5);
199 * We don't handle hostnames or continued names as they are
200 * too hard, so just bail and use the default name.
207 rrip_check(struct open_file *f, struct iso_directory_record *dp, int *lenskip)
209 ISO_SUSP_PRESENT *sp;
213 /* First, see if we can find a SP field. */
214 p = dp->name + isonum_711(dp->name_len);
215 if (p > (char *)dp + isonum_711(dp->length))
217 sp = (ISO_SUSP_PRESENT *)p;
218 if (bcmp(sp->h.type, SUSP_PRESENT, 2) != 0)
220 if (isonum_711(sp->h.length) != sizeof(ISO_SUSP_PRESENT))
222 if (sp->signature[0] != 0xbe || sp->signature[1] != 0xef)
224 *lenskip = isonum_711(sp->len_skp);
227 * Now look for an ER field. If RRIP is present, then there must
228 * be at least one of these. It would be more pedantic to walk
229 * through the list of fields looking for a Rock Ridge ER field.
231 er = (ISO_RRIP_EXTREF *)susp_lookup_record(f, SUSP_EXTREF, dp, 0);
238 dirmatch(struct open_file *f, const char *path, struct iso_directory_record *dp,
239 int use_rrip, int lenskip)
246 cp = rrip_lookup_name(f, dp, lenskip, &len);
250 len = isonum_711(dp->name_len);
255 for (i = len; --i >= 0; path++, cp++) {
256 if (!*path || *path == '/')
260 if (!icase && toupper(*path) == *cp)
264 if (*path && *path != '/')
267 * Allow stripping of trailing dots and the version number.
268 * Note that this will find the first instead of the last version
271 if (i >= 0 && (*cp == ';' || *cp == '.')) {
272 /* This is to prevent matching of numeric extensions */
273 if (*cp == '.' && cp[1] != ';')
276 if (*++cp != ';' && (*cp < '0' || *cp > '9'))
283 cd9660_open(const char *path, struct open_file *f)
287 struct iso_primary_descriptor *vd;
288 size_t buf_size, read, dsize, off;
290 struct iso_directory_record rec;
291 struct iso_directory_record *dp = 0;
292 int rc, first, use_rrip, lenskip;
294 /* First find the volume descriptor */
295 buf = malloc(buf_size = ISO_DEFAULT_BLOCK_SIZE);
297 for (bno = 16;; bno++) {
299 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
300 ISO_DEFAULT_BLOCK_SIZE, buf, &read);
303 if (read != ISO_DEFAULT_BLOCK_SIZE) {
308 if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
310 if (isonum_711(vd->type) == ISO_VD_END)
312 if (isonum_711(vd->type) == ISO_VD_PRIMARY)
315 if (isonum_723(vd->logical_block_size) != ISO_DEFAULT_BLOCK_SIZE)
318 rec = *(struct iso_directory_record *) vd->root_directory_record;
319 if (*path == '/') path++; /* eat leading '/' */
324 bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
325 dsize = isonum_733(rec.size);
329 while (off < dsize) {
330 if ((off % ISO_DEFAULT_BLOCK_SIZE) == 0) {
332 rc = f->f_dev->dv_strategy
333 (f->f_devdata, F_READ,
334 cdb2devb(bno + boff),
335 ISO_DEFAULT_BLOCK_SIZE,
339 if (read != ISO_DEFAULT_BLOCK_SIZE) {
344 dp = (struct iso_directory_record *) buf;
346 if (isonum_711(dp->length) == 0) {
347 /* skip to next block, if any */
348 off = boff * ISO_DEFAULT_BLOCK_SIZE;
352 /* See if RRIP is in use. */
354 use_rrip = rrip_check(f, dp, &lenskip);
356 if (dirmatch(f, path, dp, use_rrip,
357 first ? 0 : lenskip)) {
363 dp = (struct iso_directory_record *)
364 ((char *) dp + isonum_711(dp->length));
365 off += isonum_711(dp->length);
373 while (*path && *path != '/') /* look for next component */
375 if (*path == '/') { /* skip /, make sure is dir */
377 if (*path && (isonum_711(dp->flags) & 2) == 0) {
378 rc = ENOENT; /* not directory */
384 /* allocate file system specific data structure */
385 fp = malloc(sizeof(struct file));
386 bzero(fp, sizeof(struct file));
387 f->f_fsdata = (void *)fp;
389 if ((isonum_711(rec.flags) & 2) != 0) {
390 fp->f_flags = F_ISDIR;
393 fp->f_flags |= F_ROOTDIR;
395 /* Check for Rock Ridge since we didn't in the loop above. */
396 bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
398 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
399 ISO_DEFAULT_BLOCK_SIZE, buf, &read);
402 if (read != ISO_DEFAULT_BLOCK_SIZE) {
406 dp = (struct iso_directory_record *)buf;
407 use_rrip = rrip_check(f, dp, &lenskip);
411 fp->f_susp_skip = lenskip;
414 fp->f_bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
415 fp->f_size = isonum_733(rec.size);
429 cd9660_close(struct open_file *f)
431 struct file *fp = (struct file *)f->f_fsdata;
440 buf_read_file(struct open_file *f, char **buf_p, size_t *size_p)
442 struct file *fp = (struct file *)f->f_fsdata;
443 daddr_t blkno, blkoff;
447 blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE + fp->f_bno;
448 blkoff = fp->f_off % ISO_DEFAULT_BLOCK_SIZE;
450 if (blkno != fp->f_buf_blkno) {
451 if (fp->f_buf == (char *)0)
452 fp->f_buf = malloc(ISO_DEFAULT_BLOCK_SIZE);
455 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ,
456 cdb2devb(blkno), ISO_DEFAULT_BLOCK_SIZE, fp->f_buf, &read);
459 if (read != ISO_DEFAULT_BLOCK_SIZE)
462 fp->f_buf_blkno = blkno;
465 *buf_p = fp->f_buf + blkoff;
466 *size_p = ISO_DEFAULT_BLOCK_SIZE - blkoff;
468 if (*size_p > fp->f_size - fp->f_off)
469 *size_p = fp->f_size - fp->f_off;
474 cd9660_read(struct open_file *f, void *start, size_t size, size_t *resid)
476 struct file *fp = (struct file *)f->f_fsdata;
478 size_t buf_size, csize;
483 if (fp->f_off < 0 || fp->f_off >= fp->f_size)
486 rc = buf_read_file(f, &buf, &buf_size);
490 csize = size > buf_size ? buf_size : size;
491 bcopy(buf, addr, csize);
503 cd9660_readdir(struct open_file *f, struct dirent *d)
505 struct file *fp = (struct file *)f->f_fsdata;
506 struct iso_directory_record *ep;
507 size_t buf_size, reclen, namelen;
513 if (fp->f_off >= fp->f_size)
515 error = buf_read_file(f, &buf, &buf_size);
518 ep = (struct iso_directory_record *)buf;
520 if (isonum_711(ep->length) == 0) {
523 /* skip to next block, if any */
524 blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE;
525 fp->f_off = (blkno + 1) * ISO_DEFAULT_BLOCK_SIZE;
529 if (fp->f_flags & F_RR) {
530 if (fp->f_flags & F_ROOTDIR && fp->f_off == 0)
533 lenskip = fp->f_susp_skip;
534 name = rrip_lookup_name(f, ep, lenskip, &namelen);
538 namelen = isonum_711(ep->name_len);
541 if (ep->name[0] == 0)
543 else if (ep->name[0] == 1) {
549 reclen = sizeof(struct dirent) - (MAXNAMLEN+1) + namelen + 1;
550 reclen = (reclen + 3) & ~3;
552 d->d_fileno = isonum_733(ep->extent);
553 d->d_reclen = reclen;
554 if (isonum_711(ep->flags) & 2)
558 d->d_namlen = namelen;
560 bcopy(name, d->d_name, d->d_namlen);
561 d->d_name[d->d_namlen] = 0;
563 fp->f_off += isonum_711(ep->length);
568 cd9660_write(struct open_file *f, void *start, size_t size, size_t *resid)
574 cd9660_seek(struct open_file *f, off_t offset, int where)
576 struct file *fp = (struct file *)f->f_fsdata;
586 fp->f_off = fp->f_size - offset;
595 cd9660_stat(struct open_file *f, struct stat *sb)
597 struct file *fp = (struct file *)f->f_fsdata;
599 /* only important stuff */
600 sb->st_mode = S_IRUSR | S_IRGRP | S_IROTH;
601 if (fp->f_flags & F_ISDIR)
602 sb->st_mode |= S_IFDIR;
604 sb->st_mode |= S_IFREG;
605 sb->st_uid = sb->st_gid = 0;
606 sb->st_size = fp->f_size;