279 lines
6.9 KiB
C
279 lines
6.9 KiB
C
/* $NetBSD: cd9660.c,v 1.1 1998/02/01 06:59:30 thorpej Exp $ */
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/*
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* Copyright (C) 1996 Wolfgang Solfrank.
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* Copyright (C) 1996 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* File lookup for ISO-9660 file systems. Taken from:
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*
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* src/sys/lib/libsa/cd9660.c
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*
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* NetBSD: cd9660.c,v 1.5 1997/06/26 19:11:33 drochner Exp
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*/
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/*
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* Stand-alone ISO9660 file reading package.
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*
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* Note: This doesn't support Rock Ridge extensions, extended attributes,
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* blocksizes other than 2048 bytes, multi-extent files, etc.
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*/
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#include <sys/param.h>
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#include <isofs/cd9660/iso.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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struct ptable_ent {
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char namlen [ISODCL( 1, 1)]; /* 711 */
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char extlen [ISODCL( 2, 2)]; /* 711 */
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char block [ISODCL( 3, 6)]; /* 732 */
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char parent [ISODCL( 7, 8)]; /* 722 */
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char name [1];
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};
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#define PTFIXSZ 8
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#define PTSIZE(pp) roundup(PTFIXSZ + isonum_711((pp)->namlen), 2)
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#define cdb2devb(bno) ((bno) * ISO_DEFAULT_BLOCK_SIZE / DEV_BSIZE)
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static int pnmatch __P((char *, struct ptable_ent *));
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static int dirmatch __P((char *, struct iso_directory_record *));
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static int strategy __P((int, off_t, size_t, void *, size_t *));
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static int
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pnmatch(path, pp)
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char *path;
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struct ptable_ent *pp;
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{
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char *cp;
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int i;
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cp = pp->name;
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for (i = isonum_711(pp->namlen); --i >= 0; path++, cp++) {
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if (toupper(*path) == *cp)
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continue;
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return 0;
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}
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if (*path != '/')
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return 0;
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return 1;
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}
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static int
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dirmatch(path, dp)
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char *path;
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struct iso_directory_record *dp;
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{
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char *cp;
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int i;
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/* This needs to be a regular file */
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if (dp->flags[0] & 6)
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return 0;
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cp = dp->name;
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for (i = isonum_711(dp->name_len); --i >= 0; path++, cp++) {
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if (!*path)
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break;
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if (toupper(*path) == *cp)
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continue;
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return 0;
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}
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if (*path)
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return 0;
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/*
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* Allow stripping of trailing dots and the version number.
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* Note that this will find the first instead of the last version
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* of a file.
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*/
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if (i >= 0 && (*cp == ';' || *cp == '.')) {
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/* This is to prevent matching of numeric extensions */
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if (*cp == '.' && cp[1] != ';')
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return 0;
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while (--i >= 0)
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if (*++cp != ';' && (*cp < '0' || *cp > '9'))
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return 0;
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}
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return 1;
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}
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static int
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strategy(fd, blkno, size, buf, cnt)
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int fd;
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off_t blkno;
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size_t size;
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void *buf;
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size_t *cnt;
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{
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off_t offset = blkno * DEV_BSIZE;
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if (lseek(fd, offset, SEEK_SET) != offset)
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return (1);
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*cnt = read(fd, buf, size);
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if (*cnt != size)
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return (1);
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return (0);
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}
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int
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cd9660_lookup(path, fd, blknop, sizep)
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char *path;
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int fd;
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u_long *blknop, *sizep;
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{
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void *buf;
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struct iso_primary_descriptor *vd;
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size_t buf_size, read, psize, dsize;
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daddr_t bno;
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int parent, ent;
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struct ptable_ent *pp;
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struct iso_directory_record *dp = 0;
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int rc;
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/* First find the volume descriptor */
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buf = malloc(buf_size = ISO_DEFAULT_BLOCK_SIZE);
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vd = buf;
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for (bno = 16;; bno++) {
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rc = strategy(fd, cdb2devb(bno), ISO_DEFAULT_BLOCK_SIZE,
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buf, &read);
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if (rc)
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goto out;
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if (read != ISO_DEFAULT_BLOCK_SIZE) {
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rc = EIO;
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goto out;
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}
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rc = EINVAL;
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if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
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goto out;
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if (isonum_711(vd->type) == ISO_VD_END)
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goto out;
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if (isonum_711(vd->type) == ISO_VD_PRIMARY)
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break;
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}
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if (isonum_723(vd->logical_block_size) != ISO_DEFAULT_BLOCK_SIZE)
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goto out;
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/* Now get the path table and lookup the directory of the file */
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bno = isonum_732(vd->type_m_path_table);
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psize = isonum_733(vd->path_table_size);
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if (psize > ISO_DEFAULT_BLOCK_SIZE) {
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free(buf);
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buf = malloc(buf_size = roundup(psize, ISO_DEFAULT_BLOCK_SIZE));
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}
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rc = strategy(fd, cdb2devb(bno), buf_size, buf, &read);
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if (rc)
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goto out;
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if (read != buf_size) {
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rc = EIO;
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goto out;
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}
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parent = 1;
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pp = (struct ptable_ent *)buf;
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ent = 1;
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bno = isonum_732(pp->block) + isonum_711(pp->extlen);
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rc = ENOENT;
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while (*path) {
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if ((u_long)pp >= (u_long)buf + psize)
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break;
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if (isonum_722(pp->parent) != parent)
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break;
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if (!pnmatch(path, pp)) {
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pp = (struct ptable_ent *)((u_long)pp + PTSIZE(pp));
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ent++;
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continue;
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}
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path += isonum_711(pp->namlen) + 1;
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parent = ent;
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bno = isonum_732(pp->block) + isonum_711(pp->extlen);
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while ((u_long)pp < (u_long)buf + psize) {
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if (isonum_722(pp->parent) == parent)
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break;
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pp = (struct ptable_ent *)((u_long)pp + PTSIZE(pp));
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ent++;
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}
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}
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/* Now bno has the start of the directory that supposedly contains the file */
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bno--;
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dsize = 1; /* Something stupid, but > 0 XXX */
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for (psize = 0; psize < dsize;) {
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if (!(psize % ISO_DEFAULT_BLOCK_SIZE)) {
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bno++;
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rc = strategy(fd, cdb2devb(bno),
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ISO_DEFAULT_BLOCK_SIZE, buf, &read);
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if (rc)
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goto out;
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if (read != ISO_DEFAULT_BLOCK_SIZE) {
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rc = EIO;
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goto out;
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}
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dp = (struct iso_directory_record *)buf;
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}
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if (!isonum_711(dp->length)) {
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if ((void *)dp == buf)
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psize += ISO_DEFAULT_BLOCK_SIZE;
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else
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psize = roundup(psize, ISO_DEFAULT_BLOCK_SIZE);
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continue;
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}
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if (dsize == 1)
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dsize = isonum_733(dp->size);
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if (dirmatch(path, dp))
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break;
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psize += isonum_711(dp->length);
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dp = (struct iso_directory_record *)((u_long)dp + isonum_711(dp->length));
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}
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if (psize >= dsize) {
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rc = ENOENT;
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goto out;
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}
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*blknop = isonum_733(dp->extent);
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*sizep = isonum_733(dp->size);
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free(buf);
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return 0;
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out:
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free(buf);
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return rc;
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}
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