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| Current File : //usr/src/sys/fs/cd9660/cd9660_rrip.c |
/*-
* Copyright (c) 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley
* by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
* Support code is derived from software contributed to Berkeley
* by Atsushi Murai (amurai@spec.co.jp).
*
* 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.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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.
*
* @(#)cd9660_rrip.c 8.6 (Berkeley) 12/5/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/fs/cd9660/cd9660_rrip.c 193066 2009-05-29 21:27:12Z jamie $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/jail.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <fs/cd9660/iso.h>
#include <fs/cd9660/cd9660_node.h>
#include <fs/cd9660/cd9660_rrip.h>
#include <fs/cd9660/iso_rrip.h>
typedef int rrt_func_t(void *, ISO_RRIP_ANALYZE *ana);
typedef struct {
char type[2];
rrt_func_t *func;
void (*func2)(struct iso_directory_record *isodir, ISO_RRIP_ANALYZE *ana);
int result;
} RRIP_TABLE;
static int cd9660_rrip_altname(ISO_RRIP_ALTNAME *p, ISO_RRIP_ANALYZE *ana);
static int cd9660_rrip_attr(ISO_RRIP_ATTR *p, ISO_RRIP_ANALYZE *ana);
static int cd9660_rrip_cont(ISO_RRIP_CONT *p, ISO_RRIP_ANALYZE *ana);
static void cd9660_rrip_defattr(struct iso_directory_record *isodir,
ISO_RRIP_ANALYZE *ana);
static void cd9660_rrip_defname(struct iso_directory_record *isodir,
ISO_RRIP_ANALYZE *ana);
static void cd9660_rrip_deftstamp(struct iso_directory_record *isodir,
ISO_RRIP_ANALYZE *ana);
static int cd9660_rrip_device(ISO_RRIP_DEVICE *p, ISO_RRIP_ANALYZE *ana);
static int cd9660_rrip_extref(ISO_RRIP_EXTREF *p, ISO_RRIP_ANALYZE *ana);
static int cd9660_rrip_idflag(ISO_RRIP_IDFLAG *p, ISO_RRIP_ANALYZE *ana);
static int cd9660_rrip_loop(struct iso_directory_record *isodir,
ISO_RRIP_ANALYZE *ana, RRIP_TABLE *table);
static int cd9660_rrip_pclink(ISO_RRIP_CLINK *p, ISO_RRIP_ANALYZE *ana);
static int cd9660_rrip_reldir(ISO_RRIP_RELDIR *p, ISO_RRIP_ANALYZE *ana);
static int cd9660_rrip_slink(ISO_RRIP_SLINK *p, ISO_RRIP_ANALYZE *ana);
static int cd9660_rrip_stop(ISO_SUSP_HEADER *p, ISO_RRIP_ANALYZE *ana);
static int cd9660_rrip_tstamp(ISO_RRIP_TSTAMP *p, ISO_RRIP_ANALYZE *ana);
/*
* POSIX file attribute
*/
static int
cd9660_rrip_attr(p,ana)
ISO_RRIP_ATTR *p;
ISO_RRIP_ANALYZE *ana;
{
ana->inop->inode.iso_mode = isonum_733(p->mode);
ana->inop->inode.iso_uid = isonum_733(p->uid);
ana->inop->inode.iso_gid = isonum_733(p->gid);
ana->inop->inode.iso_links = isonum_733(p->links);
ana->fields &= ~ISO_SUSP_ATTR;
return ISO_SUSP_ATTR;
}
static void
cd9660_rrip_defattr(isodir,ana)
struct iso_directory_record *isodir;
ISO_RRIP_ANALYZE *ana;
{
/* But this is a required field! */
printf("RRIP without PX field?\n");
cd9660_defattr(isodir,ana->inop,NULL,ISO_FTYPE_RRIP);
}
/*
* Symbolic Links
*/
static int
cd9660_rrip_slink(p,ana)
ISO_RRIP_SLINK *p;
ISO_RRIP_ANALYZE *ana;
{
ISO_RRIP_SLINK_COMPONENT *pcomp;
ISO_RRIP_SLINK_COMPONENT *pcompe;
int len, wlen, cont;
char *outbuf, *inbuf;
char hostbuf[MAXHOSTNAMELEN];
pcomp = (ISO_RRIP_SLINK_COMPONENT *)p->component;
pcompe = (ISO_RRIP_SLINK_COMPONENT *)((char *)p + isonum_711(p->h.length));
len = *ana->outlen;
outbuf = ana->outbuf;
cont = ana->cont;
/*
* Gathering a Symbolic name from each component with path
*/
for (;
pcomp < pcompe;
pcomp = (ISO_RRIP_SLINK_COMPONENT *)((char *)pcomp + ISO_RRIP_SLSIZ
+ isonum_711(pcomp->clen))) {
if (!cont) {
if (len < ana->maxlen) {
len++;
*outbuf++ = '/';
}
}
cont = 0;
inbuf = "..";
wlen = 0;
switch (*pcomp->cflag) {
case ISO_SUSP_CFLAG_CURRENT:
/* Inserting Current */
wlen = 1;
break;
case ISO_SUSP_CFLAG_PARENT:
/* Inserting Parent */
wlen = 2;
break;
case ISO_SUSP_CFLAG_ROOT:
/* Inserting slash for ROOT */
/* Double slash, nothing really to do here. */
break;
case ISO_SUSP_CFLAG_VOLROOT:
/* Inserting a mount point i.e. "/cdrom" */
/* same as above */
outbuf -= len;
len = 0;
inbuf = ana->imp->im_mountp->mnt_stat.f_mntonname;
wlen = strlen(inbuf);
break;
case ISO_SUSP_CFLAG_HOST:
/* Inserting hostname i.e. "kurt.tools.de" */
getcredhostname(curthread->td_ucred, hostbuf,
sizeof(hostbuf));
inbuf = hostbuf;
wlen = strlen(inbuf);
break;
case ISO_SUSP_CFLAG_CONTINUE:
cont = 1;
/* FALLTHROUGH */
case 0:
/* Inserting component */
wlen = isonum_711(pcomp->clen);
inbuf = pcomp->name;
break;
default:
printf("RRIP with incorrect flags?");
wlen = ana->maxlen + 1;
break;
}
if (len + wlen > ana->maxlen) {
/* indicate error to caller */
ana->cont = 1;
ana->fields = 0;
ana->outbuf -= *ana->outlen;
*ana->outlen = 0;
return 0;
}
bcopy(inbuf,outbuf,wlen);
outbuf += wlen;
len += wlen;
}
ana->outbuf = outbuf;
*ana->outlen = len;
ana->cont = cont;
if (!isonum_711(p->flags)) {
ana->fields &= ~ISO_SUSP_SLINK;
return ISO_SUSP_SLINK;
}
return 0;
}
/*
* Alternate name
*/
static int
cd9660_rrip_altname(p,ana)
ISO_RRIP_ALTNAME *p;
ISO_RRIP_ANALYZE *ana;
{
char *inbuf;
int wlen;
int cont;
char hostbuf[MAXHOSTNAMELEN];
inbuf = "..";
wlen = 0;
cont = 0;
switch (*p->flags) {
case ISO_SUSP_CFLAG_CURRENT:
/* Inserting Current */
wlen = 1;
break;
case ISO_SUSP_CFLAG_PARENT:
/* Inserting Parent */
wlen = 2;
break;
case ISO_SUSP_CFLAG_HOST:
/* Inserting hostname i.e. "kurt.tools.de" */
getcredhostname(curthread->td_ucred, hostbuf, sizeof(hostbuf));
inbuf = hostbuf;
wlen = strlen(inbuf);
break;
case ISO_SUSP_CFLAG_CONTINUE:
cont = 1;
/* FALLTHROUGH */
case 0:
/* Inserting component */
wlen = isonum_711(p->h.length) - 5;
inbuf = (char *)p + 5;
break;
default:
printf("RRIP with incorrect NM flags?\n");
wlen = ana->maxlen + 1;
break;
}
if ((*ana->outlen += wlen) > ana->maxlen) {
/* treat as no name field */
ana->fields &= ~ISO_SUSP_ALTNAME;
ana->outbuf -= *ana->outlen - wlen;
*ana->outlen = 0;
return 0;
}
bcopy(inbuf,ana->outbuf,wlen);
ana->outbuf += wlen;
if (!cont) {
ana->fields &= ~ISO_SUSP_ALTNAME;
return ISO_SUSP_ALTNAME;
}
return 0;
}
static void
cd9660_rrip_defname(isodir,ana)
struct iso_directory_record *isodir;
ISO_RRIP_ANALYZE *ana;
{
isofntrans(isodir->name,isonum_711(isodir->name_len),
ana->outbuf,ana->outlen,
1,isonum_711(isodir->flags)&4, ana->imp->joliet_level,
ana->imp->im_flags, ana->imp->im_d2l);
switch (*ana->outbuf) {
default:
break;
case 1:
*ana->outlen = 2;
/* FALLTHROUGH */
case 0:
/* outlen is 1 already */
strcpy(ana->outbuf,"..");
break;
}
}
/*
* Parent or Child Link
*/
static int
cd9660_rrip_pclink(p,ana)
ISO_RRIP_CLINK *p;
ISO_RRIP_ANALYZE *ana;
{
*ana->inump = isonum_733(p->dir_loc) << ana->imp->im_bshift;
ana->fields &= ~(ISO_SUSP_CLINK|ISO_SUSP_PLINK);
return *p->h.type == 'C' ? ISO_SUSP_CLINK : ISO_SUSP_PLINK;
}
/*
* Relocated directory
*/
static int
cd9660_rrip_reldir(p,ana)
ISO_RRIP_RELDIR *p;
ISO_RRIP_ANALYZE *ana;
{
/* special hack to make caller aware of RE field */
*ana->outlen = 0;
ana->fields = 0;
return ISO_SUSP_RELDIR|ISO_SUSP_ALTNAME|ISO_SUSP_CLINK|ISO_SUSP_PLINK;
}
static int
cd9660_rrip_tstamp(p,ana)
ISO_RRIP_TSTAMP *p;
ISO_RRIP_ANALYZE *ana;
{
u_char *ptime;
ptime = p->time;
/* Check a format of time stamp (7bytes/17bytes) */
if (!(*p->flags&ISO_SUSP_TSTAMP_FORM17)) {
if (*p->flags&ISO_SUSP_TSTAMP_CREAT)
ptime += 7;
if (*p->flags&ISO_SUSP_TSTAMP_MODIFY) {
cd9660_tstamp_conv7(ptime,&ana->inop->inode.iso_mtime,
ISO_FTYPE_RRIP);
ptime += 7;
} else
bzero(&ana->inop->inode.iso_mtime,sizeof(struct timespec));
if (*p->flags&ISO_SUSP_TSTAMP_ACCESS) {
cd9660_tstamp_conv7(ptime,&ana->inop->inode.iso_atime,
ISO_FTYPE_RRIP);
ptime += 7;
} else
ana->inop->inode.iso_atime = ana->inop->inode.iso_mtime;
if (*p->flags&ISO_SUSP_TSTAMP_ATTR)
cd9660_tstamp_conv7(ptime,&ana->inop->inode.iso_ctime,
ISO_FTYPE_RRIP);
else
ana->inop->inode.iso_ctime = ana->inop->inode.iso_mtime;
} else {
if (*p->flags&ISO_SUSP_TSTAMP_CREAT)
ptime += 17;
if (*p->flags&ISO_SUSP_TSTAMP_MODIFY) {
cd9660_tstamp_conv17(ptime,&ana->inop->inode.iso_mtime);
ptime += 17;
} else
bzero(&ana->inop->inode.iso_mtime,sizeof(struct timespec));
if (*p->flags&ISO_SUSP_TSTAMP_ACCESS) {
cd9660_tstamp_conv17(ptime,&ana->inop->inode.iso_atime);
ptime += 17;
} else
ana->inop->inode.iso_atime = ana->inop->inode.iso_mtime;
if (*p->flags&ISO_SUSP_TSTAMP_ATTR)
cd9660_tstamp_conv17(ptime,&ana->inop->inode.iso_ctime);
else
ana->inop->inode.iso_ctime = ana->inop->inode.iso_mtime;
}
ana->fields &= ~ISO_SUSP_TSTAMP;
return ISO_SUSP_TSTAMP;
}
static void
cd9660_rrip_deftstamp(isodir,ana)
struct iso_directory_record *isodir;
ISO_RRIP_ANALYZE *ana;
{
cd9660_deftstamp(isodir,ana->inop,NULL,ISO_FTYPE_RRIP);
}
/*
* POSIX device modes
*/
static int
cd9660_rrip_device(p,ana)
ISO_RRIP_DEVICE *p;
ISO_RRIP_ANALYZE *ana;
{
u_int high, low;
high = isonum_733(p->dev_t_high);
low = isonum_733(p->dev_t_low);
if (high == 0)
ana->inop->inode.iso_rdev = makedev(major(low), minor(low));
else
ana->inop->inode.iso_rdev = makedev(high, minor(low));
ana->fields &= ~ISO_SUSP_DEVICE;
return ISO_SUSP_DEVICE;
}
/*
* Flag indicating
*/
static int
cd9660_rrip_idflag(p,ana)
ISO_RRIP_IDFLAG *p;
ISO_RRIP_ANALYZE *ana;
{
ana->fields &= isonum_711(p->flags)|~0xff; /* don't touch high bits */
/* special handling of RE field */
if (ana->fields&ISO_SUSP_RELDIR)
return cd9660_rrip_reldir(/* XXX */ (ISO_RRIP_RELDIR *)p,ana);
return ISO_SUSP_IDFLAG;
}
/*
* Continuation pointer
*/
static int
cd9660_rrip_cont(p,ana)
ISO_RRIP_CONT *p;
ISO_RRIP_ANALYZE *ana;
{
ana->iso_ce_blk = isonum_733(p->location);
ana->iso_ce_off = isonum_733(p->offset);
ana->iso_ce_len = isonum_733(p->length);
return ISO_SUSP_CONT;
}
/*
* System Use end
*/
static int
cd9660_rrip_stop(p,ana)
ISO_SUSP_HEADER *p;
ISO_RRIP_ANALYZE *ana;
{
return ISO_SUSP_STOP;
}
/*
* Extension reference
*/
static int
cd9660_rrip_extref(p,ana)
ISO_RRIP_EXTREF *p;
ISO_RRIP_ANALYZE *ana;
{
if ( ! ((isonum_711(p->len_id) == 10
&& bcmp((char *)p + 8,"RRIP_1991A",10) == 0)
|| (isonum_711(p->len_id) == 10
&& bcmp((char *)p + 8,"IEEE_P1282",10) == 0)
|| (isonum_711(p->len_id) == 9
&& bcmp((char *)p + 8,"IEEE_1282", 9) == 0))
|| isonum_711(p->version) != 1)
return 0;
ana->fields &= ~ISO_SUSP_EXTREF;
return ISO_SUSP_EXTREF;
}
static int
cd9660_rrip_loop(isodir,ana,table)
struct iso_directory_record *isodir;
ISO_RRIP_ANALYZE *ana;
RRIP_TABLE *table;
{
RRIP_TABLE *ptable;
ISO_SUSP_HEADER *phead;
ISO_SUSP_HEADER *pend;
struct buf *bp = NULL;
char *pwhead;
u_short c;
int result;
/*
* Note: If name length is odd,
* it will be padding 1 byte after the name
*/
pwhead = isodir->name + isonum_711(isodir->name_len);
if (!(isonum_711(isodir->name_len)&1))
pwhead++;
isochar(isodir->name, pwhead, ana->imp->joliet_level, &c, NULL,
ana->imp->im_flags, ana->imp->im_d2l);
/* If it's not the '.' entry of the root dir obey SP field */
if (c != 0 || isonum_733(isodir->extent) != ana->imp->root_extent)
pwhead += ana->imp->rr_skip;
else
pwhead += ana->imp->rr_skip0;
phead = (ISO_SUSP_HEADER *)pwhead;
pend = (ISO_SUSP_HEADER *)((char *)isodir + isonum_711(isodir->length));
result = 0;
while (1) {
ana->iso_ce_len = 0;
/*
* Note: "pend" should be more than one SUSP header
*/
while (pend >= phead + 1) {
if (isonum_711(phead->version) == 1) {
for (ptable = table; ptable->func; ptable++) {
if (*phead->type == *ptable->type
&& phead->type[1] == ptable->type[1]) {
result |= ptable->func(phead,ana);
break;
}
}
if (!ana->fields)
break;
}
if (result&ISO_SUSP_STOP) {
result &= ~ISO_SUSP_STOP;
break;
}
/* plausibility check */
if (isonum_711(phead->length) < sizeof(*phead))
break;
/*
* move to next SUSP
* Hopefully this works with newer versions, too
*/
phead = (ISO_SUSP_HEADER *)((char *)phead + isonum_711(phead->length));
}
if (ana->fields && ana->iso_ce_len) {
if (ana->iso_ce_blk >= ana->imp->volume_space_size
|| ana->iso_ce_off + ana->iso_ce_len > ana->imp->logical_block_size
|| bread(ana->imp->im_devvp,
ana->iso_ce_blk <<
(ana->imp->im_bshift - DEV_BSHIFT),
ana->imp->logical_block_size, NOCRED, &bp))
/* what to do now? */
break;
phead = (ISO_SUSP_HEADER *)(bp->b_data + ana->iso_ce_off);
pend = (ISO_SUSP_HEADER *) ((char *)phead + ana->iso_ce_len);
} else
break;
}
if (bp)
brelse(bp);
/*
* If we don't find the Basic SUSP stuffs, just set default value
* (attribute/time stamp)
*/
for (ptable = table; ptable->func2; ptable++)
if (!(ptable->result&result))
ptable->func2(isodir,ana);
return result;
}
/*
* Get Attributes.
*/
/*
* XXX the casts are bogus but will do for now.
*/
#define BC (rrt_func_t *)
static RRIP_TABLE rrip_table_analyze[] = {
{ "PX", BC cd9660_rrip_attr, cd9660_rrip_defattr, ISO_SUSP_ATTR },
{ "TF", BC cd9660_rrip_tstamp, cd9660_rrip_deftstamp, ISO_SUSP_TSTAMP },
{ "PN", BC cd9660_rrip_device, 0, ISO_SUSP_DEVICE },
{ "RR", BC cd9660_rrip_idflag, 0, ISO_SUSP_IDFLAG },
{ "CE", BC cd9660_rrip_cont, 0, ISO_SUSP_CONT },
{ "ST", BC cd9660_rrip_stop, 0, ISO_SUSP_STOP },
{ "", 0, 0, 0 }
};
int
cd9660_rrip_analyze(isodir,inop,imp)
struct iso_directory_record *isodir;
struct iso_node *inop;
struct iso_mnt *imp;
{
ISO_RRIP_ANALYZE analyze;
analyze.inop = inop;
analyze.imp = imp;
analyze.fields = ISO_SUSP_ATTR|ISO_SUSP_TSTAMP|ISO_SUSP_DEVICE;
return cd9660_rrip_loop(isodir,&analyze,rrip_table_analyze);
}
/*
* Get Alternate Name.
*/
static RRIP_TABLE rrip_table_getname[] = {
{ "NM", BC cd9660_rrip_altname, cd9660_rrip_defname, ISO_SUSP_ALTNAME },
{ "CL", BC cd9660_rrip_pclink, 0, ISO_SUSP_CLINK|ISO_SUSP_PLINK },
{ "PL", BC cd9660_rrip_pclink, 0, ISO_SUSP_CLINK|ISO_SUSP_PLINK },
{ "RE", BC cd9660_rrip_reldir, 0, ISO_SUSP_RELDIR },
{ "RR", BC cd9660_rrip_idflag, 0, ISO_SUSP_IDFLAG },
{ "CE", BC cd9660_rrip_cont, 0, ISO_SUSP_CONT },
{ "ST", BC cd9660_rrip_stop, 0, ISO_SUSP_STOP },
{ "", 0, 0, 0 }
};
int
cd9660_rrip_getname(isodir,outbuf,outlen,inump,imp)
struct iso_directory_record *isodir;
char *outbuf;
u_short *outlen;
ino_t *inump;
struct iso_mnt *imp;
{
ISO_RRIP_ANALYZE analyze;
RRIP_TABLE *tab;
u_short c;
analyze.outbuf = outbuf;
analyze.outlen = outlen;
analyze.maxlen = NAME_MAX;
analyze.inump = inump;
analyze.imp = imp;
analyze.fields = ISO_SUSP_ALTNAME|ISO_SUSP_RELDIR|ISO_SUSP_CLINK|ISO_SUSP_PLINK;
*outlen = 0;
isochar(isodir->name, isodir->name + isonum_711(isodir->name_len),
imp->joliet_level, &c, NULL, imp->im_flags, imp->im_d2l);
tab = rrip_table_getname;
if (c == 0 || c == 1) {
cd9660_rrip_defname(isodir,&analyze);
analyze.fields &= ~ISO_SUSP_ALTNAME;
tab++;
}
return cd9660_rrip_loop(isodir,&analyze,tab);
}
/*
* Get Symbolic Link.
*/
static RRIP_TABLE rrip_table_getsymname[] = {
{ "SL", BC cd9660_rrip_slink, 0, ISO_SUSP_SLINK },
{ "RR", BC cd9660_rrip_idflag, 0, ISO_SUSP_IDFLAG },
{ "CE", BC cd9660_rrip_cont, 0, ISO_SUSP_CONT },
{ "ST", BC cd9660_rrip_stop, 0, ISO_SUSP_STOP },
{ "", 0, 0, 0 }
};
int
cd9660_rrip_getsymname(isodir,outbuf,outlen,imp)
struct iso_directory_record *isodir;
char *outbuf;
u_short *outlen;
struct iso_mnt *imp;
{
ISO_RRIP_ANALYZE analyze;
analyze.outbuf = outbuf;
analyze.outlen = outlen;
*outlen = 0;
analyze.maxlen = MAXPATHLEN;
analyze.cont = 1; /* don't start with a slash */
analyze.imp = imp;
analyze.fields = ISO_SUSP_SLINK;
return (cd9660_rrip_loop(isodir,&analyze,rrip_table_getsymname)&ISO_SUSP_SLINK);
}
static RRIP_TABLE rrip_table_extref[] = {
{ "ER", BC cd9660_rrip_extref, 0, ISO_SUSP_EXTREF },
{ "CE", BC cd9660_rrip_cont, 0, ISO_SUSP_CONT },
{ "ST", BC cd9660_rrip_stop, 0, ISO_SUSP_STOP },
{ "", 0, 0, 0 }
};
/*
* Check for Rock Ridge Extension and return offset of its fields.
* Note: We insist on the ER field.
*/
int
cd9660_rrip_offset(isodir,imp)
struct iso_directory_record *isodir;
struct iso_mnt *imp;
{
ISO_RRIP_OFFSET *p;
ISO_RRIP_ANALYZE analyze;
imp->rr_skip0 = 0;
p = (ISO_RRIP_OFFSET *)(isodir->name + 1);
if (bcmp(p,"SP\7\1\276\357",6)) {
/* Maybe, it's a CDROM XA disc? */
imp->rr_skip0 = 15;
p = (ISO_RRIP_OFFSET *)((char *)p + 15);
if (bcmp(p,"SP\7\1\276\357",6))
return -1;
}
analyze.imp = imp;
analyze.fields = ISO_SUSP_EXTREF;
if (!(cd9660_rrip_loop(isodir,&analyze,rrip_table_extref)&ISO_SUSP_EXTREF))
return -1;
return isonum_711(p->skip);
}