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 <vfs/isofs/cd9660/iso.h>
45 #include <vfs/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 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);
160 rrip_lookup_name(struct open_file *f, struct iso_directory_record *dp,
161 int lenskip, size_t *len)
168 p = (ISO_RRIP_ALTNAME *)susp_lookup_record(f, RRIP_NAME, dp, lenskip);
172 case ISO_SUSP_CFLAG_CURRENT:
175 case ISO_SUSP_CFLAG_PARENT:
179 *len = isonum_711(p->h.length) - 5;
180 return ((char *)p + 5);
183 * We don't handle hostnames or continued names as they are
184 * too hard, so just bail and use the default name.
191 rrip_check(struct open_file *f, struct iso_directory_record *dp, int *lenskip)
193 ISO_SUSP_PRESENT *sp;
197 /* First, see if we can find a SP field. */
198 p = dp->name + isonum_711(dp->name_len);
199 if (p > (char *)dp + isonum_711(dp->length))
201 sp = (ISO_SUSP_PRESENT *)p;
202 if (bcmp(sp->h.type, SUSP_PRESENT, 2) != 0)
204 if (isonum_711(sp->h.length) != sizeof(ISO_SUSP_PRESENT))
206 if (sp->signature[0] != 0xbe || sp->signature[1] != 0xef)
208 *lenskip = isonum_711(sp->len_skp);
211 * Now look for an ER field. If RRIP is present, then there must
212 * be at least one of these. It would be more pedantic to walk
213 * through the list of fields looking for a Rock Ridge ER field.
215 er = (ISO_RRIP_EXTREF *)susp_lookup_record(f, SUSP_EXTREF, dp, 0);
222 dirmatch(struct open_file *f, const char *path, struct iso_directory_record *dp,
223 int use_rrip, int lenskip)
230 cp = rrip_lookup_name(f, dp, lenskip, &len);
234 len = isonum_711(dp->name_len);
239 for (i = len; --i >= 0; path++, cp++) {
240 if (!*path || *path == '/')
244 if (!icase && toupper(*path) == *cp)
248 if (*path && *path != '/')
252 * Allow stripping of trailing dots and the version number.
254 * Note that this will find the first instead of the last version
255 * of a file unless explicitly specified.
257 * For any inexact matches we ignore everything after and including
258 * the semicolon in the directory entry name, assuming it is a
259 * version number whether it is or not.
263 return 1; /* ignore version */
264 if (cp[0] == '.' && i == 0)
265 return 1; /* ignore trailing dot */
266 if (cp[0] == '.' && i > 0 && cp[1] == ';')
267 return 1; /* ignore trailing dot w/ version */
268 return 0; /* else mismatch */
274 cd9660_open(const char *path, struct open_file *f)
276 struct file *fp = NULL;
278 struct iso_primary_descriptor *vd;
279 size_t buf_size, read, dsize, off;
281 struct iso_directory_record rec;
282 struct iso_directory_record *dp = NULL;
283 int rc, first, use_rrip, lenskip;
285 /* First find the volume descriptor */
286 buf = malloc(buf_size = ISO_DEFAULT_BLOCK_SIZE);
288 for (bno = 16;; bno++) {
290 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
291 ISO_DEFAULT_BLOCK_SIZE, buf, &read);
294 if (read != ISO_DEFAULT_BLOCK_SIZE) {
299 if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
301 if (isonum_711(vd->type) == ISO_VD_END)
303 if (isonum_711(vd->type) == ISO_VD_PRIMARY)
306 if (isonum_723(vd->logical_block_size) != ISO_DEFAULT_BLOCK_SIZE)
309 rec = *(struct iso_directory_record *) vd->root_directory_record;
310 if (*path == '/') path++; /* eat leading '/' */
315 bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
316 dsize = isonum_733(rec.size);
320 while (off < dsize) {
321 if ((off % ISO_DEFAULT_BLOCK_SIZE) == 0) {
323 rc = f->f_dev->dv_strategy
324 (f->f_devdata, F_READ,
325 cdb2devb(bno + boff),
326 ISO_DEFAULT_BLOCK_SIZE,
330 if (read != ISO_DEFAULT_BLOCK_SIZE) {
335 dp = (struct iso_directory_record *) buf;
337 if (isonum_711(dp->length) == 0) {
338 /* skip to next block, if any */
339 off = boff * ISO_DEFAULT_BLOCK_SIZE;
343 /* See if RRIP is in use. */
345 use_rrip = rrip_check(f, dp, &lenskip);
347 if (dirmatch(f, path, dp, use_rrip,
348 first ? 0 : lenskip)) {
354 dp = (struct iso_directory_record *)
355 ((char *) dp + isonum_711(dp->length));
356 off += isonum_711(dp->length);
364 while (*path && *path != '/') /* look for next component */
366 if (*path == '/') { /* skip /, make sure is dir */
368 if (*path && (isonum_711(dp->flags) & 2) == 0) {
369 rc = ENOENT; /* not directory */
375 /* allocate file system specific data structure */
376 fp = malloc(sizeof(struct file));
377 bzero(fp, sizeof(struct file));
378 f->f_fsdata = (void *)fp;
380 if ((isonum_711(rec.flags) & 2) != 0) {
381 fp->f_flags = F_ISDIR;
384 fp->f_flags |= F_ROOTDIR;
386 /* Check for Rock Ridge since we didn't in the loop above. */
387 bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
389 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
390 ISO_DEFAULT_BLOCK_SIZE, buf, &read);
393 if (read != ISO_DEFAULT_BLOCK_SIZE) {
397 dp = (struct iso_directory_record *)buf;
398 use_rrip = rrip_check(f, dp, &lenskip);
402 fp->f_susp_skip = lenskip;
405 fp->f_bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
406 fp->f_size = isonum_733(rec.size);
421 cd9660_close(struct open_file *f)
423 struct file *fp = (struct file *)f->f_fsdata;
433 buf_read_file(struct open_file *f, char **buf_p, size_t *size_p)
435 struct file *fp = (struct file *)f->f_fsdata;
436 u_daddr_t blkno, blkoff;
440 blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE + fp->f_bno;
441 blkoff = fp->f_off % ISO_DEFAULT_BLOCK_SIZE;
443 if (blkno != fp->f_buf_blkno) {
444 if (fp->f_buf == NULL)
445 fp->f_buf = malloc(ISO_DEFAULT_BLOCK_SIZE);
448 rc = f->f_dev->dv_strategy(f->f_devdata, F_READ,
449 cdb2devb(blkno), ISO_DEFAULT_BLOCK_SIZE, fp->f_buf, &read);
452 if (read != ISO_DEFAULT_BLOCK_SIZE)
455 fp->f_buf_blkno = blkno;
458 *buf_p = fp->f_buf + blkoff;
459 *size_p = ISO_DEFAULT_BLOCK_SIZE - blkoff;
461 if (*size_p > fp->f_size - fp->f_off)
462 *size_p = fp->f_size - fp->f_off;
467 cd9660_read(struct open_file *f, void *start, size_t size, size_t *resid)
469 struct file *fp = (struct file *)f->f_fsdata;
471 size_t buf_size, csize;
476 if (fp->f_off < 0 || fp->f_off >= fp->f_size)
479 rc = buf_read_file(f, &buf, &buf_size);
483 csize = size > buf_size ? buf_size : size;
484 bcopy(buf, addr, csize);
496 cd9660_readdir(struct open_file *f, struct dirent *d)
498 struct file *fp = (struct file *)f->f_fsdata;
499 struct iso_directory_record *ep;
500 size_t buf_size, namelen;
506 if (fp->f_off >= fp->f_size)
508 error = buf_read_file(f, &buf, &buf_size);
511 ep = (struct iso_directory_record *)buf;
513 if (isonum_711(ep->length) == 0) {
516 /* skip to next block, if any */
517 blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE;
518 fp->f_off = (blkno + 1) * ISO_DEFAULT_BLOCK_SIZE;
522 if (fp->f_flags & F_RR) {
523 if (fp->f_flags & F_ROOTDIR && fp->f_off == 0)
526 lenskip = fp->f_susp_skip;
527 name = rrip_lookup_name(f, ep, lenskip, &namelen);
531 namelen = isonum_711(ep->name_len);
534 if (ep->name[0] == 0)
536 else if (ep->name[0] == 1) {
543 d->d_ino = isonum_733(ep->extent);
544 if (isonum_711(ep->flags) & 2)
548 d->d_namlen = namelen;
550 bcopy(name, d->d_name, d->d_namlen);
551 d->d_name[d->d_namlen] = 0;
553 fp->f_off += isonum_711(ep->length);
558 cd9660_write(struct open_file *f, void *start, size_t size, size_t *resid)
564 cd9660_seek(struct open_file *f, off_t offset, int where)
566 struct file *fp = (struct file *)f->f_fsdata;
576 fp->f_off = fp->f_size - offset;
585 cd9660_stat(struct open_file *f, struct stat *sb)
587 struct file *fp = (struct file *)f->f_fsdata;
589 /* only important stuff */
590 sb->st_mode = S_IRUSR | S_IRGRP | S_IROTH;
591 if (fp->f_flags & F_ISDIR)
592 sb->st_mode |= S_IFDIR;
594 sb->st_mode |= S_IFREG;
595 sb->st_uid = sb->st_gid = 0;
596 sb->st_size = fp->f_size;