[apple/xnu.git] / bsd / isofs / cd9660 / cd9660_rrip.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*      $NetBSD: cd9660_rrip.c,v 1.11 1994/12/24 15:30:10 cgd Exp $     */

/*-
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 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



 * HISTORY
 * 22-Jan-98    radar 1669467 - ISO 9660 CD support - jwc

 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/kernel.h>
#include <sys/stat.h>
#include <sys/types.h>

#include <sys/time.h>

#include <isofs/cd9660/iso.h>
#include <isofs/cd9660/cd9660_node.h>
#include <isofs/cd9660/cd9660_rrip.h>
#include <isofs/cd9660/iso_rrip.h>

/*
 * POSIX file attribute
 */
static int
cd9660_rrip_attr(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(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);
}

/*
 * Symbolic Links
 */
static int
cd9660_rrip_slink(ISO_RRIP_SLINK *p, ISO_RRIP_ANALYZE *ana)
{
        register ISO_RRIP_SLINK_COMPONENT *pcomp;
        register ISO_RRIP_SLINK_COMPONENT *pcompe;
        int len, wlen, cont;
        char *outbuf, *inbuf;
        
        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 */
                        /* start over from beginning(?) */
                        outbuf -= len;
                        len = 0;
                        break;
                        
                case ISO_SUSP_CFLAG_VOLROOT:
                        /* Inserting a mount point i.e. "/cdrom" */
                        /* same as above */
                        outbuf -= len;
                        len = 0;
                        inbuf = &(vfs_statfs(ana->imp->im_mountp)->f_mntonname);
                        wlen = strlen(inbuf);
                        break;
                        
                case ISO_SUSP_CFLAG_HOST:
                        /* Inserting hostname i.e. "kurt.tools.de" */
                        inbuf = hostname;
                        wlen = hostnamelen;
                        break;
                        
                case ISO_SUSP_CFLAG_CONTINUE:
                        cont = 1;
                        /* fall thru */
                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(ISO_RRIP_ALTNAME *p, ISO_RRIP_ANALYZE *ana)
{
        char *inbuf;
        int wlen;
        int cont;
        
        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" */
                inbuf = hostname;
                wlen = hostnamelen;
                break;
                
        case ISO_SUSP_CFLAG_CONTINUE:
                cont = 1;
                /* fall thru */
        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(struct iso_directory_record *isodir, ISO_RRIP_ANALYZE *ana)
{
        strcpy(ana->outbuf,"..");
        switch (*isodir->name) {
        default:
                isofntrans(isodir->name, isonum_711(isodir->name_len),
                           ana->outbuf, ana->outlen, 1,
                           isonum_711(isodir->flags) & associatedBit);
                break;
        case 0:
                *ana->outlen = 1;
                break;
        case 1:
                *ana->outlen = 2;
                break;
        }
}

/*
 * Parent or Child Link
 */
static int
cd9660_rrip_pclink(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
 */
/* ARGSUSED */
static int
cd9660_rrip_reldir(__unused 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(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);
                        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);
                        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);
                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(struct iso_directory_record *isodir,
                        ISO_RRIP_ANALYZE *ana)
{
        cd9660_deftstamp(isodir,ana->inop,NULL);
}

/*
 * POSIX device modes
 */
static int
cd9660_rrip_device(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(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(p,ana);
        
        return ISO_SUSP_IDFLAG;
}

/*
 * Continuation pointer
 */
static int
cd9660_rrip_cont(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
 */
/* ARGSUSED */
static int
cd9660_rrip_stop(__unused ISO_SUSP_HEADER *p, __unused ISO_RRIP_ANALYZE *ana)
{
        return ISO_SUSP_STOP;
}

/*
 * Extension reference
 */
static int
cd9660_rrip_extref(ISO_RRIP_EXTREF *p, ISO_RRIP_ANALYZE *ana)
{
        if (isonum_711(p->len_id) != 10
            || bcmp((char *)p + 8,"RRIP_1991A",10)
            || isonum_711(p->version) != 1)
                return 0;
        ana->fields &= ~ISO_SUSP_EXTREF;
        return ISO_SUSP_EXTREF;
}

typedef int (*rrip_table_func)(ISO_SUSP_HEADER *phead, ISO_RRIP_ANALYZE *ana);
typedef int (*rrip_table_func2)(struct iso_directory_record *isodir,
                              ISO_RRIP_ANALYZE *ana);
typedef struct {
        char type[2];
        rrip_table_func func;
        rrip_table_func2 func2;
        int result;
} RRIP_TABLE;

static int
cd9660_rrip_loop(struct iso_directory_record *isodir, ISO_RRIP_ANALYZE *ana,
                RRIP_TABLE *table)
{
        register RRIP_TABLE *ptable;
        register ISO_SUSP_HEADER *phead;
        register ISO_SUSP_HEADER *pend;
        struct buf *bp = NULL;
        char *pwhead;
        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++;
        
        /* If it's not the '.' entry of the root dir obey SP field */
        if (*isodir->name != 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
                            || buf_bread(ana->imp->im_devvp,
#if 1 // radar 1669467 - logical and physical blocksize are the same
                                     (daddr64_t)((unsigned)ana->iso_ce_blk),
#else
                                     (daddr64_t)((unsigned)(ana->iso_ce_blk << (ana->imp->im_bshift - DEV_BSHIFT))),
#endif // radar 1669467
                                     ana->imp->logical_block_size, NOCRED, &bp))
                                /* what to do now? */
                                break;
                        phead = (ISO_SUSP_HEADER *)((char *)buf_dataptr(bp) + ana->iso_ce_off);
                        pend = (ISO_SUSP_HEADER *) ((char *)phead + ana->iso_ce_len);
                } else
                        break;
        }
        if (bp)
                buf_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.
 */
static RRIP_TABLE rrip_table_analyze[] = {
        { "PX", (rrip_table_func)cd9660_rrip_attr,
                                        (rrip_table_func2)cd9660_rrip_defattr,
                                                                ISO_SUSP_ATTR },
        { "TF", (rrip_table_func)cd9660_rrip_tstamp,
                                        (rrip_table_func2)cd9660_rrip_deftstamp,
                                                                ISO_SUSP_TSTAMP },
        { "PN", (rrip_table_func)cd9660_rrip_device,
                                        0,                      ISO_SUSP_DEVICE },
        { "RR", (rrip_table_func)cd9660_rrip_idflag,
                                        0,                      ISO_SUSP_IDFLAG },
        { "CE", (rrip_table_func)cd9660_rrip_cont,
                                        0,                      ISO_SUSP_CONT },
        { "ST", cd9660_rrip_stop,       0,                      ISO_SUSP_STOP },
        { "",   0,                      0,                      0 }
};

int
cd9660_rrip_analyze(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", (rrip_table_func)cd9660_rrip_altname,
                                        (rrip_table_func2)cd9660_rrip_defname,
                                                                ISO_SUSP_ALTNAME },
        { "CL", (rrip_table_func)cd9660_rrip_pclink,
                                        0,                      ISO_SUSP_CLINK|ISO_SUSP_PLINK },
        { "PL", (rrip_table_func)cd9660_rrip_pclink,
                                        0,                      ISO_SUSP_CLINK|ISO_SUSP_PLINK },
        { "RE", (rrip_table_func)cd9660_rrip_reldir,
                                        0,                      ISO_SUSP_RELDIR },
        { "RR", (rrip_table_func)cd9660_rrip_idflag,
                                        0,                      ISO_SUSP_IDFLAG },
        { "CE", (rrip_table_func)cd9660_rrip_cont,
                                        0,                      ISO_SUSP_CONT },
        { "ST", cd9660_rrip_stop,       0,                      ISO_SUSP_STOP },
        { "",   0,                      0,                      0 }
};

int
cd9660_rrip_getname(struct iso_directory_record *isodir, char *outbuf,
                        u_short *outlen, ino_t *inump, struct iso_mnt *imp)
{
        ISO_RRIP_ANALYZE analyze;
        RRIP_TABLE *tab;
        
        analyze.outbuf = outbuf;
        analyze.outlen = outlen;
        analyze.maxlen = ISO_RRIP_NAMEMAX;
        analyze.inump = inump;
        analyze.imp = imp;
        analyze.fields = ISO_SUSP_ALTNAME|ISO_SUSP_RELDIR|ISO_SUSP_CLINK|ISO_SUSP_PLINK;
        *outlen = 0;
        
        tab = rrip_table_getname;
        if (*isodir->name == 0
            || *isodir->name == 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", (rrip_table_func)cd9660_rrip_slink,
                                        0,                      ISO_SUSP_SLINK },
        { "RR", (rrip_table_func)cd9660_rrip_idflag,
                                        0,                      ISO_SUSP_IDFLAG },
        { "CE", (rrip_table_func)cd9660_rrip_cont,
                                        0,                      ISO_SUSP_CONT },
        { "ST", cd9660_rrip_stop,       0,                      ISO_SUSP_STOP },
        { "",   0,                      0,                      0 }
};

int
cd9660_rrip_getsymname(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", (rrip_table_func)cd9660_rrip_extref,
                                        0,                      ISO_SUSP_EXTREF },
        { "CE", (rrip_table_func)cd9660_rrip_cont,
                                        0,                      ISO_SUSP_CONT },
        { "ST", 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(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);
}