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/param.h>
36 #include <fs/cd9660/iso.h>
37 #include <fs/cd9660/cd9660_rrip.h>
39 static uint64_t cd9660_lookup(const char *);
40 static ssize_t cd9660_fsread(uint64_t, void *, size_t);
42 #define SUSP_CONTINUATION "CE"
43 #define SUSP_PRESENT "SP"
44 #define SUSP_STOP "ST"
45 #define SUSP_EXTREF "ER"
46 #define RRIP_NAME "NM"
50 u_char signature [ISODCL ( 5, 6)];
51 u_char len_skp [ISODCL ( 7, 7)]; /* 711 */
55 read_iso_block(void *buffer, daddr_t blkno)
58 return (drvread(&dsk, buffer, blkno * 4, 4));
61 static ISO_SUSP_HEADER *
62 susp_lookup_record(const char *identifier, struct iso_directory_record *dp,
65 static char susp_buffer[ISO_DEFAULT_BLOCK_SIZE];
71 p = dp->name + isonum_711(dp->name_len) + lenskip;
72 /* Names of even length have a padding byte after the name. */
73 if ((isonum_711(dp->name_len) & 1) == 0)
75 end = (char *)dp + isonum_711(dp->length);
77 sh = (ISO_SUSP_HEADER *)p;
78 if (bcmp(sh->type, identifier, 2) == 0)
80 if (bcmp(sh->type, SUSP_STOP, 2) == 0)
82 if (bcmp(sh->type, SUSP_CONTINUATION, 2) == 0) {
83 shc = (ISO_RRIP_CONT *)sh;
84 error = read_iso_block(susp_buffer,
85 isonum_733(shc->location));
87 /* Bail if it fails. */
90 p = susp_buffer + isonum_733(shc->offset);
91 end = p + isonum_733(shc->length);
93 /* Ignore this record and skip to the next. */
94 p += isonum_711(sh->length);
96 /* Avoid infinite loops with corrupted file systems */
97 if (isonum_711(sh->length) == 0)
105 rrip_lookup_name(struct iso_directory_record *dp, int lenskip, size_t *len)
112 p = (ISO_RRIP_ALTNAME *)susp_lookup_record(RRIP_NAME, dp, lenskip);
116 case ISO_SUSP_CFLAG_CURRENT:
119 case ISO_SUSP_CFLAG_PARENT:
123 *len = isonum_711(p->h.length) - 5;
124 return ((char *)p + 5);
127 * We don't handle hostnames or continued names as they are
128 * too hard, so just bail and use the default name.
135 rrip_check(struct iso_directory_record *dp, int *lenskip)
137 ISO_SUSP_PRESENT *sp;
141 /* First, see if we can find a SP field. */
142 p = dp->name + isonum_711(dp->name_len);
143 if (p > (char *)dp + isonum_711(dp->length)) {
146 sp = (ISO_SUSP_PRESENT *)p;
147 if (bcmp(sp->h.type, SUSP_PRESENT, 2) != 0) {
150 if (isonum_711(sp->h.length) != sizeof(ISO_SUSP_PRESENT)) {
153 if (sp->signature[0] != 0xbe || sp->signature[1] != 0xef) {
156 *lenskip = isonum_711(sp->len_skp);
159 * Now look for an ER field. If RRIP is present, then there must
160 * be at least one of these. It would be more pedantic to walk
161 * through the list of fields looking for a Rock Ridge ER field.
163 er = (ISO_RRIP_EXTREF *)susp_lookup_record(SUSP_EXTREF, dp, 0);
171 dirmatch(const char *path, struct iso_directory_record *dp, int use_rrip,
175 const char *cp = NULL;
179 cp = rrip_lookup_name(dp, lenskip, &len);
183 len = isonum_711(dp->name_len);
188 for (i = len; --i >= 0; path++, cp++) {
189 if (!*path || *path == '/')
193 if (!icase && toupper(*path) == *cp)
197 if (*path && *path != '/') {
201 * Allow stripping of trailing dots and the version number.
202 * Note that this will find the first instead of the last version
205 if (i >= 0 && (*cp == ';' || *cp == '.')) {
206 /* This is to prevent matching of numeric extensions */
207 if (*cp == '.' && cp[1] != ';') {
211 if (*++cp != ';' && (*cp < '0' || *cp > '9')) {
219 cd9660_lookup(const char *path)
221 static char blkbuf[MAX(ISO_DEFAULT_BLOCK_SIZE,
222 sizeof(struct iso_primary_descriptor))];
223 struct iso_primary_descriptor *vd;
224 struct iso_directory_record rec;
225 struct iso_directory_record *dp = NULL;
228 int rc, first, use_rrip, lenskip;
231 for (bno = 16;; bno++) {
232 rc = read_iso_block(blkbuf, bno);
233 vd = (struct iso_primary_descriptor *)blkbuf;
235 if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
237 if (isonum_711(vd->type) == ISO_VD_END)
239 if (isonum_711(vd->type) == ISO_VD_PRIMARY)
243 bcopy(vd->root_directory_record, &rec, sizeof(rec));
244 if (*path == '/') path++; /* eat leading '/' */
250 bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
251 dsize = isonum_733(rec.size);
255 while (off < dsize) {
256 if ((off % ISO_DEFAULT_BLOCK_SIZE) == 0) {
257 rc = read_iso_block(blkbuf, bno + boff);
262 dp = (struct iso_directory_record *) blkbuf;
264 if (isonum_711(dp->length) == 0) {
265 /* skip to next block, if any */
266 off = boff * ISO_DEFAULT_BLOCK_SIZE;
270 /* See if RRIP is in use. */
272 use_rrip = rrip_check(dp, &lenskip);
274 if (dirmatch(path, dp, use_rrip,
275 first ? 0 : lenskip)) {
281 dp = (struct iso_directory_record *)
282 ((char *) dp + isonum_711(dp->length));
283 /* If the new block has zero length, it is padding. */
284 if (isonum_711(dp->length) == 0) {
285 /* Skip to next block, if any. */
286 off = boff * ISO_DEFAULT_BLOCK_SIZE;
289 off += isonum_711(dp->length);
296 while (*path && *path != '/') /* look for next component */
298 if (*path) path++; /* skip '/' */
301 if ((isonum_711(rec.flags) & 2) != 0) {
305 cookie = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
306 cookie = (cookie << 32) | isonum_733(rec.size);
312 cd9660_fsread(uint64_t cookie, void *buf, size_t nbytes)
314 static char blkbuf[ISO_DEFAULT_BLOCK_SIZE];
315 static daddr_t curstart = 0, curblk = 0;
316 daddr_t blk, blk_off;
318 size_t size, remaining, n;
321 size = cookie & 0xffffffff;
322 blk = (cookie >> 32) & 0xffffffff;
324 /* Make sure we're looking at the right file. */
325 if (((blk << 32) | size) != cookie) {
329 if (blk != curstart) {
341 while (remaining > 0) {
342 blk_off = fs_off >> ISO_DEFAULT_BLOCK_SHIFT;
343 byte_off = fs_off & (ISO_DEFAULT_BLOCK_SIZE - 1);
345 if (curblk != curstart + blk_off) {
346 curblk = curstart + blk_off;
347 read_iso_block(blkbuf, curblk);
350 if (remaining < ISO_DEFAULT_BLOCK_SIZE - byte_off) {
353 n = ISO_DEFAULT_BLOCK_SIZE - byte_off;
355 memcpy(s, blkbuf + byte_off, n);