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cd9660_rrip.c

/**   $MirOS: src/sys/isofs/cd9660/cd9660_rrip.c,v 1.2 2008/11/01 00:21:32 tg Exp $ */
/*    $OpenBSD: cd9660_rrip.c,v 1.8 2003/06/02 23:28:05 millert Exp $   */
/*    $NetBSD: cd9660_rrip.c,v 1.17 1997/01/24 00:27:32 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. 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/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/types.h>

#include <sys/time.h>

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

00060 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 *, RRIP_TABLE *);
/*
 * POSIX file attribute
 */
static int
cd9660_rrip_attr(v, ana)
      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(v, ana)
      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(v, ana)
      void *v;
      ISO_RRIP_ANALYZE *ana;
{
      ISO_RRIP_SLINK  *p = v;
      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 = 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);
            }
            
            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(v, ana)
      void *v;
      ISO_RRIP_ANALYZE *ana;
{
      ISO_RRIP_ALTNAME *p = v;
      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(v, ana)
      void *v;
      ISO_RRIP_ANALYZE *ana;
{
      struct iso_directory_record *isodir = v;

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

/*
 * Parent or Child Link
 */
static int
cd9660_rrip_pclink(v, ana)
      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(v, ana)
      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(v, ana)
      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
                  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(v, ana)
      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(v, ana)
      void *v;
      ISO_RRIP_ANALYZE *ana;
{
      ISO_RRIP_DEVICE *p = v;
      u_int high, low;
      uint64_t tdev;
      
      high = isonum_733(p->dev_t_high);
      low  = isonum_733(p->dev_t_low);

      tdev = (uint32_t)high;
      tdev <<= 32;
      tdev |= (uint32_t)low;
      ana->inop->inode.iso_rdev = (dev_t)tdev;

      ana->fields &= ~ISO_SUSP_DEVICE;
      return (ISO_SUSP_DEVICE);
}

/*
 * Flag indicating
 */
static int
cd9660_rrip_idflag(v, ana)
      void *v;
      ISO_RRIP_ANALYZE *ana;
{
      ISO_RRIP_IDFLAG *p = v;

      /* don't touch high bits */
      ana->fields &= isonum_711(p->flags) | ~0xff;
      /* 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(v, ana)
      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(v, ana)
      void *v;
      ISO_RRIP_ANALYZE *ana;
{
      return (ISO_SUSP_STOP);
}

/*
 * Extension reference
 */
static int
cd9660_rrip_extref(v, ana)
      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 &&
          bcmp((char *)p + 8, "IEEE_1282", 9))
            return (0);
      if (isonum_711(p->len_id) == 10 &&
          bcmp((char *)p + 8, "IEEE_P1282", 10) &&
          bcmp((char *)p + 8, "RRIP_1991A", 10))
            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;
{
      register RRIP_TABLE *ptable;
      register ISO_SUSP_HEADER *phead;
      register ISO_SUSP_HEADER *pend;
      struct buf *bp = NULL;
      char *pwhead;
      u_char 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->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, 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.
 */
static 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(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", 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(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_char 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);
      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", 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(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", 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(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));
}

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