/*      $NetBSD: cd9660_rrip.c,v 1.19 2026/05/05 08:39:45 mrg 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. 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>
__KERNEL_RCSID(0, "$NetBSD: cd9660_rrip.c,v 1.19 2026/05/05 08:39:45 mrg Exp $");

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

#include <sys/time.h>

#include <fs/cd9660/iso.h>
#include <fs/cd9660/cd9660_extern.h>
#include <fs/cd9660/cd9660_node.h>
#include <fs/cd9660/cd9660_rrip.h>
#include <fs/cd9660/iso_rrip.h>

typedef struct {
        char type[2];
        int (*func)(void *, ISO_RRIP_ANALYZE *);
        void (*func2)(void *, ISO_RRIP_ANALYZE *);
        int result;
} RRIP_TABLE;

static int cd9660_rrip_attr(void *, ISO_RRIP_ANALYZE *);
static void cd9660_rrip_defattr(void *, ISO_RRIP_ANALYZE *);
static int cd9660_rrip_slink(void *, ISO_RRIP_ANALYZE *);
static int cd9660_rrip_altname(void *, ISO_RRIP_ANALYZE *);
static void cd9660_rrip_defname(void *, ISO_RRIP_ANALYZE *);
static int cd9660_rrip_pclink(void *, ISO_RRIP_ANALYZE *);
static int cd9660_rrip_reldir(void *, ISO_RRIP_ANALYZE *);
static int cd9660_rrip_tstamp(void *, ISO_RRIP_ANALYZE *);
static void cd9660_rrip_deftstamp(void *, ISO_RRIP_ANALYZE *);
static int cd9660_rrip_device(void *, ISO_RRIP_ANALYZE *);
static int cd9660_rrip_idflag(void *, ISO_RRIP_ANALYZE *);
static int cd9660_rrip_cont(void *, ISO_RRIP_ANALYZE *);
static int cd9660_rrip_stop(void *, ISO_RRIP_ANALYZE *);
static int cd9660_rrip_extref(void *, ISO_RRIP_ANALYZE *);
static int cd9660_rrip_loop(struct iso_directory_record *,
                                 ISO_RRIP_ANALYZE *, const RRIP_TABLE *);
/*
 * POSIX file attribute
 */
static int
cd9660_rrip_attr(void *v, ISO_RRIP_ANALYZE *ana)
{
        ISO_RRIP_ATTR *p = v;

        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(void *v, ISO_RRIP_ANALYZE *ana)
{
        struct iso_directory_record *isodir = v;

        /* 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(void *v, ISO_RRIP_ANALYZE *ana)
{
        ISO_RRIP_SLINK  *p = v;
        ISO_RRIP_SLINK_COMPONENT *pcomp;
        ISO_RRIP_SLINK_COMPONENT *pcompe;
        int len, wlen, cont;
        char *outbuf;
        const char *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 = ana->imp->im_mountp->mnt_stat.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;
                }

                memcpy(outbuf, inbuf, 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(void *v, ISO_RRIP_ANALYZE *ana)
{
        ISO_RRIP_ALTNAME *p = v;
        const 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 */
                if (isonum_711(p->h.length) < sizeof(*p)) {
                        /* Entry is too small; corrupted. */
                        ana->fields &= ~ISO_SUSP_ALTNAME;
                        *ana->outlen = 0;
                        return ISO_SUSP_STOP;
                }
                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;
        }

        memcpy(ana->outbuf, inbuf, wlen);
        ana->outbuf += wlen;

        if (!cont) {
                ana->fields &= ~ISO_SUSP_ALTNAME;
                return ISO_SUSP_ALTNAME;
        }
        return 0;
}

static void
cd9660_rrip_defname(void *v, ISO_RRIP_ANALYZE *ana)
{
        struct iso_directory_record *isodir = v;

        isofntrans(isodir->name, isonum_711(isodir->name_len),
                   ana->outbuf, ana->outlen,
                   1, 0, isonum_711(isodir->flags) & 4,
                   ana->imp->im_joliet_level);
        switch (ana->outbuf[0]) {
        default:
                break;
        case 0:
                ana->outbuf[0] = '.';
                *ana->outlen = 1;
                break;
        case 1:
                strlcpy(ana->outbuf, "..", ana->maxlen - *ana->outlen);
                *ana->outlen = 2;
                break;
        }
}

/*
 * Parent or Child Link
 */
static int
cd9660_rrip_pclink(void *v, ISO_RRIP_ANALYZE *ana)
{
        ISO_RRIP_CLINK  *p = v;

        *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(void *v, 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(void *v, ISO_RRIP_ANALYZE *ana)
{
        ISO_RRIP_TSTAMP *p = v;
        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
                        memset(&ana->inop->inode.iso_mtime, 0, 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
                        memset(&ana->inop->inode.iso_mtime, 0, 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(void *v, ISO_RRIP_ANALYZE *ana)
{
        struct iso_directory_record  *isodir = v;

        cd9660_deftstamp(isodir, ana->inop, NULL);
}

/*
 * POSIX device modes
 */
static int
cd9660_rrip_device(void *v, ISO_RRIP_ANALYZE *ana)
{
        ISO_RRIP_DEVICE *p = v;
        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(void *v, ISO_RRIP_ANALYZE *ana)
{
        ISO_RRIP_IDFLAG *p = v;

        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(void *v, ISO_RRIP_ANALYZE *ana)
{
        ISO_RRIP_CONT *p = v;

        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(void *v, ISO_RRIP_ANALYZE *ana)
{
        return ISO_SUSP_STOP;
}

/*
 * Extension reference
 */
static int
cd9660_rrip_extref(void *v, ISO_RRIP_ANALYZE *ana)
{
        ISO_RRIP_EXTREF *p = v;

        if (isonum_711(p->version) != 1)
                return 0;
        if (isonum_711(p->len_id) != 9
            && isonum_711(p->len_id) != 10)
                return 0;
        if (isonum_711(p->len_id) == 9
            && memcmp((char *)p + 8, "IEEE_1282", 9))
                return 0;
        if (isonum_711(p->len_id) == 10
            && memcmp((char *)p + 8, "IEEE_P1282", 10)
            && memcmp((char *)p + 8, "RRIP_1991A", 10))
                return 0;
        ana->fields &= ~ISO_SUSP_EXTREF;
        return ISO_SUSP_EXTREF;
}


static int
cd9660_rrip_loop(struct iso_directory_record *isodir, ISO_RRIP_ANALYZE *ana,
        const RRIP_TABLE *table)
{
        const RRIP_TABLE *ptable;
        ISO_SUSP_HEADER *phead;
        ISO_SUSP_HEADER *pend;
        struct buf *bp = NULL;
        char *pwhead;
        u_int16_t c;
        int result;

        /*
         * Note: If name length is odd,
         *       it will be padded by 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->im_joliet_level, &c);

        /* 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,
                                     0, &bp))
                                /* what to do now? */
                                break;
                        phead = (ISO_SUSP_HEADER *)((char *)bp->b_data + ana->iso_ce_off);
                        pend = (ISO_SUSP_HEADER *)((char *)phead + ana->iso_ce_len);
                } else
                        break;
        }
        if (bp)
                brelse(bp, 0);
        /*
         * 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 const RRIP_TABLE rrip_table_analyze[] = {
        { "PX", cd9660_rrip_attr,       cd9660_rrip_defattr,    ISO_SUSP_ATTR },
        { "TF", cd9660_rrip_tstamp,     cd9660_rrip_deftstamp,  ISO_SUSP_TSTAMP },
        { "PN", cd9660_rrip_device,     0,                      ISO_SUSP_DEVICE },
        { "RR", cd9660_rrip_idflag,     0,                      ISO_SUSP_IDFLAG },
        { "CE", 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 const RRIP_TABLE rrip_table_getname[] = {
        { "NM", cd9660_rrip_altname,    cd9660_rrip_defname,    ISO_SUSP_ALTNAME },
        { "CL", cd9660_rrip_pclink,     0,                      ISO_SUSP_CLINK|ISO_SUSP_PLINK },
        { "PL", cd9660_rrip_pclink,     0,                      ISO_SUSP_CLINK|ISO_SUSP_PLINK },
        { "RE", cd9660_rrip_reldir,     0,                      ISO_SUSP_RELDIR },
        { "RR", cd9660_rrip_idflag,     0,                      ISO_SUSP_IDFLAG },
        { "CE", 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;
        const RRIP_TABLE *tab;
        u_int16_t c;

        analyze.outbuf = outbuf;
        analyze.outlen = outlen;
        analyze.maxlen = ISO_MAXNAMLEN;
        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->im_joliet_level, &c);
        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 const RRIP_TABLE rrip_table_getsymname[] = {
        { "SL", cd9660_rrip_slink,      0,                      ISO_SUSP_SLINK },
        { "RR", cd9660_rrip_idflag,     0,                      ISO_SUSP_IDFLAG },
        { "CE", 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 const RRIP_TABLE rrip_table_extref[] = {
        { "ER", cd9660_rrip_extref,     0,      ISO_SUSP_EXTREF },
        { "CE", 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 (memcmp(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 (memcmp(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);
}