406 lines
9.1 KiB
C
406 lines
9.1 KiB
C
/* $NetBSD: cd9660.c,v 1.1 1996/09/30 16:01:19 ws Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 1996 Wolfgang Solfrank.
|
|
* Copyright (C) 1996 TooLs GmbH.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by TooLs GmbH.
|
|
* 4. The name of TooLs GmbH may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Stand-alone ISO9660 file reading package.
|
|
*
|
|
* Note: This doesn't support Rock Ridge extensions, extended attributes,
|
|
* blocksizes other than 2048 bytes, multi-extent files, etc.
|
|
*/
|
|
#include <sys/param.h>
|
|
|
|
#include <lib/libkern/libkern.h>
|
|
|
|
/* THIS IS AN UGLY HACK!!! XXX */
|
|
struct fid;
|
|
struct mbuf;
|
|
struct nameidata;
|
|
struct netexport { int x; };
|
|
struct proc;
|
|
struct statfs;
|
|
struct ucred;
|
|
#include <isofs/cd9660/iso.h>
|
|
/* These once were in iso.h, but got deleted??? */
|
|
extern __inline int
|
|
isonum_722(p)
|
|
unsigned char *p;
|
|
{
|
|
return ((char)*p << 8)|p[1];
|
|
}
|
|
|
|
extern __inline int
|
|
isonum_732(p)
|
|
unsigned char *p;
|
|
{
|
|
return (*p << 24)|(p[1] << 16)|(p[2] << 8)|p[3];
|
|
}
|
|
|
|
#include "stand.h"
|
|
#include "cd9660.h"
|
|
|
|
struct file {
|
|
off_t off; /* Current offset within file */
|
|
daddr_t bno; /* Starting block number */
|
|
off_t size; /* Size of file */
|
|
};
|
|
|
|
struct ptable_ent {
|
|
char namlen [ISODCL( 1, 1)]; /* 711 */
|
|
char extlen [ISODCL( 2, 2)]; /* 711 */
|
|
char block [ISODCL( 3, 6)]; /* 732 */
|
|
char parent [ISODCL( 7, 8)]; /* 722 */
|
|
char name [1];
|
|
};
|
|
#define PTFIXSZ 8
|
|
#define PTSIZE(pp) roundup(PTFIXSZ + isonum_711((pp)->namlen), 2)
|
|
|
|
#define cdb2devb(bno) ((bno) * ISO_DEFAULT_BLOCK_SIZE / DEV_BSIZE)
|
|
|
|
static int
|
|
toupper(c)
|
|
int c;
|
|
{
|
|
return c >= 'a' && c <= 'z' ? c - 'a' + 'A' : c;
|
|
}
|
|
|
|
static int
|
|
pnmatch(path, pp)
|
|
char *path;
|
|
struct ptable_ent *pp;
|
|
{
|
|
char *cp;
|
|
int i;
|
|
|
|
cp = pp->name;
|
|
for (i = isonum_711(pp->namlen); --i >= 0; path++, cp++) {
|
|
if (toupper(*path) == *cp)
|
|
continue;
|
|
return 0;
|
|
}
|
|
if (*path != '/')
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
dirmatch(path, dp)
|
|
char *path;
|
|
struct iso_directory_record *dp;
|
|
{
|
|
char *cp;
|
|
int i;
|
|
|
|
/* This needs to be a regular file */
|
|
if (dp->flags[0] & 6)
|
|
return 0;
|
|
|
|
cp = dp->name;
|
|
for (i = isonum_711(dp->name_len); --i >= 0; path++, cp++) {
|
|
if (!*path)
|
|
break;
|
|
if (toupper(*path) == *cp)
|
|
continue;
|
|
return 0;
|
|
}
|
|
if (*path)
|
|
return 0;
|
|
/*
|
|
* Allow stripping of trailing dots and the version number.
|
|
* Note that this will find the first instead of the last version
|
|
* of a file.
|
|
*/
|
|
if (i >= 0 && (*cp == ';' || *cp == '.')) {
|
|
/* This is to prevent matching of numeric extensions */
|
|
if (*cp == '.' && cp[1] != ';')
|
|
return 0;
|
|
while (--i >= 0)
|
|
if (*++cp != ';' && (*cp < '0' || *cp > '9'))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
cd9660_open(path, f)
|
|
char *path;
|
|
struct open_file *f;
|
|
{
|
|
struct file *fp = 0;
|
|
void *buf;
|
|
struct iso_primary_descriptor *vd;
|
|
size_t buf_size, read, psize, dsize;
|
|
daddr_t bno;
|
|
int parent, ent;
|
|
struct ptable_ent *pp;
|
|
struct iso_directory_record *dp;
|
|
int rc;
|
|
|
|
/* First find the volume descriptor */
|
|
buf = alloc(buf_size = ISO_DEFAULT_BLOCK_SIZE);
|
|
vd = buf;
|
|
for (bno = 16;; bno++) {
|
|
twiddle();
|
|
rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
|
|
ISO_DEFAULT_BLOCK_SIZE, buf, &read);
|
|
if (rc)
|
|
goto out;
|
|
if (read != ISO_DEFAULT_BLOCK_SIZE) {
|
|
rc = EIO;
|
|
goto out;
|
|
}
|
|
rc = EINVAL;
|
|
if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
|
|
goto out;
|
|
if (isonum_711(vd->type) == ISO_VD_END)
|
|
goto out;
|
|
if (isonum_711(vd->type) == ISO_VD_PRIMARY)
|
|
break;
|
|
}
|
|
if (isonum_723(vd->logical_block_size) != ISO_DEFAULT_BLOCK_SIZE)
|
|
goto out;
|
|
|
|
/* Now get the path table and lookup the directory of the file */
|
|
bno = isonum_732(vd->type_m_path_table);
|
|
psize = isonum_733(vd->path_table_size);
|
|
|
|
if (psize > ISO_DEFAULT_BLOCK_SIZE) {
|
|
free(buf, ISO_DEFAULT_BLOCK_SIZE);
|
|
buf = alloc(buf_size = roundup(psize, ISO_DEFAULT_BLOCK_SIZE));
|
|
}
|
|
|
|
twiddle();
|
|
rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
|
|
buf_size, buf, &read);
|
|
if (rc)
|
|
goto out;
|
|
if (read != buf_size) {
|
|
rc = EIO;
|
|
goto out;
|
|
}
|
|
|
|
parent = 1;
|
|
pp = (struct ptable_ent *)buf;
|
|
ent = 1;
|
|
bno = isonum_732(pp->block) + isonum_711(pp->extlen);
|
|
|
|
rc = ENOENT;
|
|
while (*path) {
|
|
if ((void *)pp >= buf + psize)
|
|
break;
|
|
if (isonum_722(pp->parent) != parent)
|
|
break;
|
|
if (!pnmatch(path, pp)) {
|
|
pp = (struct ptable_ent *)((void *)pp + PTSIZE(pp));
|
|
ent++;
|
|
continue;
|
|
}
|
|
path += isonum_711(pp->namlen) + 1;
|
|
parent = ent;
|
|
bno = isonum_732(pp->block) + isonum_711(pp->extlen);
|
|
while ((void *)pp < buf + psize) {
|
|
if (isonum_722(pp->parent) == parent)
|
|
break;
|
|
pp = (struct ptable_ent *)((void *)pp + PTSIZE(pp));
|
|
ent++;
|
|
}
|
|
}
|
|
|
|
/* Now bno has the start of the directory that supposedly contains the file */
|
|
bno--;
|
|
dsize = 1; /* Something stupid, but > 0 XXX */
|
|
for (psize = 0; psize < dsize;) {
|
|
if (!(psize % ISO_DEFAULT_BLOCK_SIZE)) {
|
|
bno++;
|
|
twiddle();
|
|
rc = f->f_dev->dv_strategy(f->f_devdata, F_READ,
|
|
cdb2devb(bno),
|
|
ISO_DEFAULT_BLOCK_SIZE,
|
|
buf, &read);
|
|
if (rc)
|
|
goto out;
|
|
if (read != ISO_DEFAULT_BLOCK_SIZE) {
|
|
rc = EIO;
|
|
goto out;
|
|
}
|
|
dp = (struct iso_directory_record *)buf;
|
|
}
|
|
if (!isonum_711(dp->length)) {
|
|
if ((void *)dp == buf)
|
|
psize += ISO_DEFAULT_BLOCK_SIZE;
|
|
else
|
|
psize = roundup(psize, ISO_DEFAULT_BLOCK_SIZE);
|
|
continue;
|
|
}
|
|
if (dsize == 1)
|
|
dsize = isonum_733(dp->size);
|
|
if (dirmatch(path, dp))
|
|
break;
|
|
psize += isonum_711(dp->length);
|
|
dp = (struct iso_directory_record *)((void *)dp + isonum_711(dp->length));
|
|
}
|
|
|
|
if (psize >= dsize) {
|
|
rc = ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
/* allocate file system specific data structure */
|
|
fp = alloc(sizeof(struct file));
|
|
bzero(fp, sizeof(struct file));
|
|
f->f_fsdata = (void *)fp;
|
|
|
|
fp->off = 0;
|
|
fp->bno = isonum_733(dp->extent);
|
|
fp->size = isonum_733(dp->size);
|
|
free(buf, buf_size);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
if (fp)
|
|
free(fp, sizeof(struct file));
|
|
free(buf, buf_size);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
cd9660_close(f)
|
|
struct open_file *f;
|
|
{
|
|
struct file *fp = (struct file *)f->f_fsdata;
|
|
|
|
f->f_fsdata = 0;
|
|
free(fp, sizeof *fp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
cd9660_read(f, start, size, resid)
|
|
struct open_file *f;
|
|
void *start;
|
|
size_t size;
|
|
size_t *resid;
|
|
{
|
|
struct file *fp = (struct file *)f->f_fsdata;
|
|
int rc = 0;
|
|
daddr_t bno;
|
|
char buf[ISO_DEFAULT_BLOCK_SIZE];
|
|
char *dp;
|
|
size_t read, off;
|
|
|
|
while (size) {
|
|
if (fp->off < 0 || fp->off >= fp->size)
|
|
break;
|
|
bno = fp->off / ISO_DEFAULT_BLOCK_SIZE + fp->bno;
|
|
if (fp->off & (ISO_DEFAULT_BLOCK_SIZE - 1)
|
|
|| size < ISO_DEFAULT_BLOCK_SIZE)
|
|
dp = buf;
|
|
else
|
|
dp = start;
|
|
twiddle();
|
|
rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
|
|
ISO_DEFAULT_BLOCK_SIZE, dp, &read);
|
|
if (rc)
|
|
return rc;
|
|
if (read != ISO_DEFAULT_BLOCK_SIZE)
|
|
return EIO;
|
|
if (dp == buf) {
|
|
off = fp->off & (ISO_DEFAULT_BLOCK_SIZE - 1);
|
|
if (read > off + size)
|
|
read = off + size;
|
|
read -= off;
|
|
bcopy(buf + off, start, read);
|
|
start += read;
|
|
fp->off += read;
|
|
size -= read;
|
|
} else {
|
|
start += ISO_DEFAULT_BLOCK_SIZE;
|
|
fp->off += ISO_DEFAULT_BLOCK_SIZE;
|
|
size -= ISO_DEFAULT_BLOCK_SIZE;
|
|
}
|
|
}
|
|
if (resid)
|
|
*resid = size;
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
cd9660_write(f, start, size, resid)
|
|
struct open_file *f;
|
|
void *start;
|
|
size_t size;
|
|
size_t *resid;
|
|
{
|
|
return EROFS;
|
|
}
|
|
|
|
off_t
|
|
cd9660_seek(f, offset, where)
|
|
struct open_file *f;
|
|
off_t offset;
|
|
int where;
|
|
{
|
|
struct file *fp = (struct file *)f->f_fsdata;
|
|
|
|
switch (where) {
|
|
case SEEK_SET:
|
|
fp->off = offset;
|
|
break;
|
|
case SEEK_CUR:
|
|
fp->off += offset;
|
|
break;
|
|
case SEEK_END:
|
|
fp->off = fp->size - offset;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
return fp->off;
|
|
}
|
|
|
|
int
|
|
cd9660_stat(f, sb)
|
|
struct open_file *f;
|
|
struct stat *sb;
|
|
{
|
|
struct file *fp = (struct file *)f->f_fsdata;
|
|
|
|
/* only importatn stuff */
|
|
sb->st_mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
|
|
sb->st_uid = sb->st_gid = 0;
|
|
sb->st_size = fp->size;
|
|
return 0;
|
|
}
|