402 lines
9.4 KiB
C
402 lines
9.4 KiB
C
/* $NetBSD: cd9660.c,v 1.5 1997/06/26 19:11:33 drochner 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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* 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 <string.h>
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#include <isofs/cd9660/iso.h>
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#include "stand.h"
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static int cd9660_open(const char *path, struct open_file *f);
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static int cd9660_close(struct open_file *f);
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static int cd9660_read(struct open_file *f, void *buf, size_t size, size_t *resid);
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static int cd9660_write(struct open_file *f, void *buf, size_t size, size_t *resid);
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static off_t cd9660_seek(struct open_file *f, off_t offset, int where);
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static int cd9660_stat(struct open_file *f, struct stat *sb);
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struct fs_ops cd9660_fsops = {
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"cd9660", cd9660_open, cd9660_close, cd9660_read, cd9660_write, cd9660_seek, cd9660_stat
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};
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struct file {
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off_t off; /* Current offset within file */
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daddr_t bno; /* Starting block number */
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off_t size; /* Size of file */
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};
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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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/* XXX these should be in the system headers */
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static __inline int
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isonum_722(p)
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u_char *p;
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{
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return (*p << 8)|p[1];
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}
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static __inline int
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isonum_732(p)
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u_char *p;
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{
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return (*p << 24)|(p[1] << 16)|(p[2] << 8)|p[3];
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}
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static int
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pnmatch(path, pp)
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const 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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const 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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cd9660_open(path, f)
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const char *path;
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struct open_file *f;
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{
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struct file *fp = 0;
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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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twiddle();
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rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, 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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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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twiddle();
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rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
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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 ((void *)pp >= 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 *)((void *)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 ((void *)pp < 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 *)((void *)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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twiddle();
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rc = f->f_dev->dv_strategy(f->f_devdata, F_READ,
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cdb2devb(bno),
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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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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 *)((void *)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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/* allocate file system specific data structure */
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fp = malloc(sizeof(struct file));
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bzero(fp, sizeof(struct file));
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f->f_fsdata = (void *)fp;
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fp->off = 0;
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fp->bno = isonum_733(dp->extent);
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fp->size = 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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if (fp)
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free(fp);
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free(buf);
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return rc;
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}
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static int
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cd9660_close(f)
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struct open_file *f;
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{
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struct file *fp = (struct file *)f->f_fsdata;
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f->f_fsdata = 0;
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free(fp);
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return 0;
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}
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static int
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cd9660_read(f, start, size, resid)
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struct open_file *f;
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void *start;
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size_t size;
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size_t *resid;
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{
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struct file *fp = (struct file *)f->f_fsdata;
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int rc = 0;
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daddr_t bno;
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char buf[ISO_DEFAULT_BLOCK_SIZE];
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char *dp;
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size_t read, off;
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while (size) {
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if (fp->off < 0 || fp->off >= fp->size)
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break;
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bno = fp->off / ISO_DEFAULT_BLOCK_SIZE + fp->bno;
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if (fp->off & (ISO_DEFAULT_BLOCK_SIZE - 1)
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|| size < ISO_DEFAULT_BLOCK_SIZE)
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dp = buf;
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else
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dp = start;
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twiddle();
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rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
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ISO_DEFAULT_BLOCK_SIZE, dp, &read);
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if (rc)
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return rc;
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if (read != ISO_DEFAULT_BLOCK_SIZE)
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return EIO;
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if (dp == buf) {
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off = fp->off & (ISO_DEFAULT_BLOCK_SIZE - 1);
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if (read > off + size)
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read = off + size;
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read -= off;
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bcopy(buf + off, start, read);
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start += read;
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fp->off += read;
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size -= read;
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} else {
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start += ISO_DEFAULT_BLOCK_SIZE;
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fp->off += ISO_DEFAULT_BLOCK_SIZE;
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size -= ISO_DEFAULT_BLOCK_SIZE;
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}
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}
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if (resid)
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*resid = size;
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return rc;
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}
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static int
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cd9660_write(f, start, size, resid)
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struct open_file *f;
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void *start;
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size_t size;
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size_t *resid;
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{
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return EROFS;
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}
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static off_t
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cd9660_seek(f, offset, where)
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struct open_file *f;
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off_t offset;
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int where;
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{
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struct file *fp = (struct file *)f->f_fsdata;
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switch (where) {
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case SEEK_SET:
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fp->off = offset;
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break;
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case SEEK_CUR:
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fp->off += offset;
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break;
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case SEEK_END:
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fp->off = fp->size - offset;
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break;
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default:
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return -1;
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}
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return fp->off;
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}
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static int
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cd9660_stat(f, sb)
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struct open_file *f;
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struct stat *sb;
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{
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struct file *fp = (struct file *)f->f_fsdata;
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/* only importatn stuff */
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sb->st_mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
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sb->st_uid = sb->st_gid = 0;
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sb->st_size = fp->size;
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return 0;
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}
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