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.
32 /* Originally derived from libsa/cd9660.c: */
33 /* $NetBSD: cd9660.c,v 1.5 1997/06/26 19:11:33 drochner Exp $ */
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
39 #include <fs/cd9660/iso.h>
40 #include <fs/cd9660/cd9660_rrip.h>
42 static uint64_t cd9660_lookup(const char *);
43 static ssize_t cd9660_fsread(uint64_t, void *, size_t);
45 #define SUSP_CONTINUATION "CE"
46 #define SUSP_PRESENT "SP"
47 #define SUSP_STOP "ST"
48 #define SUSP_EXTREF "ER"
49 #define RRIP_NAME "NM"
53 u_char signature [ISODCL ( 5, 6)];
54 u_char len_skp [ISODCL ( 7, 7)]; /* 711 */
58 read_iso_block(void *buffer, daddr_t blkno)
61 return (drvread(&dsk, buffer, blkno * 4, 4));
64 static ISO_SUSP_HEADER *
65 susp_lookup_record(const char *identifier, struct iso_directory_record *dp,
68 static char susp_buffer[ISO_DEFAULT_BLOCK_SIZE];
74 p = dp->name + isonum_711(dp->name_len) + lenskip;
75 /* Names of even length have a padding byte after the name. */
76 if ((isonum_711(dp->name_len) & 1) == 0)
78 end = (char *)dp + isonum_711(dp->length);
80 sh = (ISO_SUSP_HEADER *)p;
81 if (bcmp(sh->type, identifier, 2) == 0)
83 if (bcmp(sh->type, SUSP_STOP, 2) == 0)
85 if (bcmp(sh->type, SUSP_CONTINUATION, 2) == 0) {
86 shc = (ISO_RRIP_CONT *)sh;
87 error = read_iso_block(susp_buffer,
88 isonum_733(shc->location));
90 /* Bail if it fails. */
93 p = susp_buffer + isonum_733(shc->offset);
94 end = p + isonum_733(shc->length);
96 /* Ignore this record and skip to the next. */
97 p += isonum_711(sh->length);
99 /* Avoid infinite loops with corrupted file systems */
100 if (isonum_711(sh->length) == 0)
108 rrip_lookup_name(struct iso_directory_record *dp, int lenskip, size_t *len)
115 p = (ISO_RRIP_ALTNAME *)susp_lookup_record(RRIP_NAME, dp, lenskip);
119 case ISO_SUSP_CFLAG_CURRENT:
122 case ISO_SUSP_CFLAG_PARENT:
126 *len = isonum_711(p->h.length) - 5;
127 return ((char *)p + 5);
130 * We don't handle hostnames or continued names as they are
131 * too hard, so just bail and use the default name.
138 rrip_check(struct iso_directory_record *dp, int *lenskip)
140 ISO_SUSP_PRESENT *sp;
144 /* First, see if we can find a SP field. */
145 p = dp->name + isonum_711(dp->name_len);
146 if (p > (char *)dp + isonum_711(dp->length)) {
149 sp = (ISO_SUSP_PRESENT *)p;
150 if (bcmp(sp->h.type, SUSP_PRESENT, 2) != 0) {
153 if (isonum_711(sp->h.length) != sizeof(ISO_SUSP_PRESENT)) {
156 if (sp->signature[0] != 0xbe || sp->signature[1] != 0xef) {
159 *lenskip = isonum_711(sp->len_skp);
162 * Now look for an ER field. If RRIP is present, then there must
163 * be at least one of these. It would be more pedantic to walk
164 * through the list of fields looking for a Rock Ridge ER field.
166 er = (ISO_RRIP_EXTREF *)susp_lookup_record(SUSP_EXTREF, dp, 0);
174 dirmatch(const char *path, struct iso_directory_record *dp, int use_rrip,
178 const char *cp = NULL;
182 cp = rrip_lookup_name(dp, lenskip, &len);
186 len = isonum_711(dp->name_len);
191 for (i = len; --i >= 0; path++, cp++) {
192 if (!*path || *path == '/')
196 if (!icase && toupper(*path) == *cp)
200 if (*path && *path != '/') {
204 * Allow stripping of trailing dots and the version number.
205 * Note that this will find the first instead of the last version
208 if (i >= 0 && (*cp == ';' || *cp == '.')) {
209 /* This is to prevent matching of numeric extensions */
210 if (*cp == '.' && cp[1] != ';') {
214 if (*++cp != ';' && (*cp < '0' || *cp > '9')) {
222 cd9660_lookup(const char *path)
224 static char blkbuf[MAX(ISO_DEFAULT_BLOCK_SIZE,
225 sizeof(struct iso_primary_descriptor))];
226 struct iso_primary_descriptor *vd;
227 struct iso_directory_record rec;
228 struct iso_directory_record *dp = NULL;
231 int rc, first, use_rrip, lenskip;
234 for (bno = 16;; bno++) {
235 rc = read_iso_block(blkbuf, bno);
236 vd = (struct iso_primary_descriptor *)blkbuf;
238 if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
240 if (isonum_711(vd->type) == ISO_VD_END)
242 if (isonum_711(vd->type) == ISO_VD_PRIMARY)
246 bcopy(vd->root_directory_record, &rec, sizeof(rec));
247 if (*path == '/') path++; /* eat leading '/' */
253 bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
254 dsize = isonum_733(rec.size);
258 while (off < dsize) {
259 if ((off % ISO_DEFAULT_BLOCK_SIZE) == 0) {
260 rc = read_iso_block(blkbuf, bno + boff);
265 dp = (struct iso_directory_record *) blkbuf;
267 if (isonum_711(dp->length) == 0) {
268 /* skip to next block, if any */
269 off = boff * ISO_DEFAULT_BLOCK_SIZE;
273 /* See if RRIP is in use. */
275 use_rrip = rrip_check(dp, &lenskip);
277 if (dirmatch(path, dp, use_rrip,
278 first ? 0 : lenskip)) {
284 dp = (struct iso_directory_record *)
285 ((char *) dp + isonum_711(dp->length));
286 /* If the new block has zero length, it is padding. */
287 if (isonum_711(dp->length) == 0) {
288 /* Skip to next block, if any. */
289 off = boff * ISO_DEFAULT_BLOCK_SIZE;
292 off += isonum_711(dp->length);
299 while (*path && *path != '/') /* look for next component */
301 if (*path) path++; /* skip '/' */
304 if ((isonum_711(rec.flags) & 2) != 0) {
308 cookie = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
309 cookie = (cookie << 32) | isonum_733(rec.size);
315 cd9660_fsread(uint64_t cookie, void *buf, size_t nbytes)
317 static char blkbuf[ISO_DEFAULT_BLOCK_SIZE];
318 static daddr_t curstart = 0, curblk = 0;
319 daddr_t blk, blk_off;
321 size_t size, remaining, n;
324 size = cookie & 0xffffffff;
325 blk = (cookie >> 32) & 0xffffffff;
327 /* Make sure we're looking at the right file. */
328 if (((blk << 32) | size) != cookie) {
332 if (blk != curstart) {
344 while (remaining > 0) {
345 blk_off = fs_off >> ISO_DEFAULT_BLOCK_SHIFT;
346 byte_off = fs_off & (ISO_DEFAULT_BLOCK_SIZE - 1);
348 if (curblk != curstart + blk_off) {
349 curblk = curstart + blk_off;
350 read_iso_block(blkbuf, curblk);
353 if (remaining < ISO_DEFAULT_BLOCK_SIZE - byte_off) {
356 n = ISO_DEFAULT_BLOCK_SIZE - byte_off;
358 memcpy(s, blkbuf + byte_off, n);