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cpio.c

/*    $OpenBSD: cpio.c,v 1.5 1997/07/25 18:58:28 mickey Exp $     */
/*    $NetBSD: cpio.c,v 1.5 1995/03/21 09:07:13 cgd Exp $   */

/*-
 * Copyright (c) 1992 Keith Muller.
 * Copyright (c) 1992, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Keith Muller of the University of California, San Diego.
 *
 * 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.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)cpio.c  8.1 (Berkeley) 5/31/93";
#else
static char rcsid[] = "$OpenBSD: cpio.c,v 1.5 1997/07/25 18:58:28 mickey Exp $";
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include "pax.h"
#include "cpio.h"
#include "extern.h"

static int rd_nm __P((register ARCHD *, int));
static int rd_ln_nm __P((register ARCHD *));
static int com_rd __P((register ARCHD *));

/*
 * Routines which support the different cpio versions
 */

static int swp_head;          /* binary cpio header byte swap */

/*
 * Routines common to all versions of cpio
 */

/*
 * cpio_strd()
 *    Fire up the hard link detection code
 * Return:
 *      0 if ok -1 otherwise (the return values of lnk_start())
 */

#ifdef __STDC__
int
cpio_strd(void)
#else
int
cpio_strd()
#endif
{
      return(lnk_start());
}

/*
 * cpio_trail()
 *    Called to determine if a header block is a valid trailer. We are
 *    passed the block, the in_sync flag (which tells us we are in resync
 *    mode; looking for a valid header), and cnt (which starts at zero)
 *    which is used to count the number of empty blocks we have seen so far.
 * Return:
 *    0 if a valid trailer, -1 if not a valid trailer, 
 */

#ifdef __STDC__
int
cpio_trail(register ARCHD *arcn)
#else
int
cpio_trail(arcn)
      register ARCHD *arcn;
#endif
{
      /*
       * look for trailer id in file we are about to process
       */
      if ((strcmp(arcn->name, TRAILER) == 0) && (arcn->sb.st_size == 0))
            return(0);
      return(-1);
}

/*
 * com_rd()
 *    operations common to all cpio read functions.
 * Return:
 *    0
 */

#ifdef __STDC__
static int
com_rd(register ARCHD *arcn)
#else
static int
com_rd(arcn)
      register ARCHD *arcn;
#endif
{
      arcn->skip = 0;
      arcn->pat = NULL;
      arcn->org_name = arcn->name;
      switch(arcn->sb.st_mode & C_IFMT) {
      case C_ISFIFO:
            arcn->type = PAX_FIF;
            break;
      case C_ISDIR:
            arcn->type = PAX_DIR;
            break;
      case C_ISBLK:
            arcn->type = PAX_BLK;
            break;
      case C_ISCHR:
            arcn->type = PAX_CHR;
            break;
      case C_ISLNK:
            arcn->type = PAX_SLK;
            break;
      case C_ISOCK:
            arcn->type = PAX_SCK;
            break;
      case C_ISCTG:
      case C_ISREG:
      default:
            /*
             * we have file data, set up skip (pad is set in the format
             * specific sections)
             */
            arcn->sb.st_mode = (arcn->sb.st_mode & 0xfff) | C_ISREG;
            arcn->type = PAX_REG;
            arcn->skip = arcn->sb.st_size;
            break;
      }
      if (chk_lnk(arcn) < 0)
            return(-1);
      return(0);
}

/*
 * cpio_end_wr()
 *    write the special file with the name trailer in the proper format
 * Return:
 *    result of the write of the trailer from the cpio specific write func
 */

#ifdef __STDC__
int
cpio_endwr(void)
#else
int
cpio_endwr()
#endif
{
      ARCHD last;

      /*
       * create a trailer request and call the proper format write function
       */
      memset(&last, 0, sizeof(last));
      last.nlen = sizeof(TRAILER) - 1;
      last.type = PAX_REG;
      last.sb.st_nlink = 1;
      (void)strcpy(last.name, TRAILER);
      return((*frmt->wr)(&last));
}

/*
 * rd_nam()
 *    read in the file name which follows the cpio header
 * Return:
 *    0 if ok, -1 otherwise
 */

#ifdef __STDC__
static int
rd_nm(register ARCHD *arcn, int nsz)
#else
static int
rd_nm(arcn, nsz)
      register ARCHD *arcn;
      int nsz;
#endif
{
      /*
       * do not even try bogus values
       */
      if ((nsz == 0) || (nsz > sizeof(arcn->name))) {
            paxwarn(1, "Cpio file name length %d is out of range", nsz);
            return(-1);
      }

      /*
       * read the name and make sure it is not empty and is \0 terminated
       */
      if ((rd_wrbuf(arcn->name,nsz) != nsz) || (arcn->name[nsz-1] != '\0') ||
          (arcn->name[0] == '\0')) {
            paxwarn(1, "Cpio file name in header is corrupted");
            return(-1);
      }
      return(0);
}

/*
 * rd_ln_nm()
 *    read in the link name for a file with links. The link name is stored
 *    like file data (and is NOT \0 terminated!)
 * Return:
 *    0 if ok, -1 otherwise
 */

#ifdef __STDC__
static int
rd_ln_nm(register ARCHD *arcn)
#else
static int
rd_ln_nm(arcn)
      register ARCHD *arcn;
#endif
{
      /*
       * check the length specified for bogus values
       */
      if ((arcn->sb.st_size == 0) ||
          (arcn->sb.st_size >= sizeof(arcn->ln_name))) {
#           ifdef NET2_STAT
            paxwarn(1, "Cpio link name length is invalid: %lu",
                arcn->sb.st_size);
#           else
            paxwarn(1, "Cpio link name length is invalid: %qu",
                arcn->sb.st_size);
#           endif
            return(-1);
      }

      /*
       * read in the link name and \0 terminate it
       */
      if (rd_wrbuf(arcn->ln_name, (int)arcn->sb.st_size) !=
          (int)arcn->sb.st_size) {
            paxwarn(1, "Cpio link name read error");
            return(-1);
      }
      arcn->ln_nlen = arcn->sb.st_size;
      arcn->ln_name[arcn->ln_nlen] = '\0';

      /*
       * watch out for those empty link names
       */
      if (arcn->ln_name[0] == '\0') {
            paxwarn(1, "Cpio link name is corrupt");
            return(-1);
      }
      return(0);
}

/*
 * Routines common to the extended byte oriented cpio format
 */

/*
 * cpio_id()
 *      determine if a block given to us is a valid extended byte oriented
 *    cpio header
 * Return:
 *      0 if a valid header, -1 otherwise
 */

#ifdef __STDC__
int
cpio_id(char *blk, int size)
#else
int
cpio_id(blk, size)
      char *blk;
      int size;
#endif
{
      if ((size < sizeof(HD_CPIO)) ||
          (strncmp(blk, AMAGIC, sizeof(AMAGIC) - 1) != 0))
            return(-1);
      return(0);
}

/*
 * cpio_rd()
 *    determine if a buffer is a byte oriented extended cpio archive entry.
 *    convert and store the values in the ARCHD parameter.
 * Return:
 *    0 if a valid header, -1 otherwise.
 */

#ifdef __STDC__
int
cpio_rd(register ARCHD *arcn, register char *buf)
#else
int
cpio_rd(arcn, buf)
      register ARCHD *arcn;
      register char *buf;
#endif
{
      register int nsz;
      register HD_CPIO *hd;

      /*
       * check that this is a valid header, if not return -1
       */
      if (cpio_id(buf, sizeof(HD_CPIO)) < 0)
            return(-1);
      hd = (HD_CPIO *)buf;

      /*
       * byte oriented cpio (posix) does not have padding! extract the octal
       * ascii fields from the header
       */
      arcn->pad = 0L;
      arcn->sb.st_dev = (dev_t)asc_ul(hd->c_dev, sizeof(hd->c_dev), OCT);
      arcn->sb.st_ino = (ino_t)asc_ul(hd->c_ino, sizeof(hd->c_ino), OCT);
      arcn->sb.st_mode = (mode_t)asc_ul(hd->c_mode, sizeof(hd->c_mode), OCT);
      arcn->sb.st_uid = (uid_t)asc_ul(hd->c_uid, sizeof(hd->c_uid), OCT);
      arcn->sb.st_gid = (gid_t)asc_ul(hd->c_gid, sizeof(hd->c_gid), OCT);
      arcn->sb.st_nlink = (nlink_t)asc_ul(hd->c_nlink, sizeof(hd->c_nlink),
          OCT);
      arcn->sb.st_rdev = (dev_t)asc_ul(hd->c_rdev, sizeof(hd->c_rdev), OCT);
      arcn->sb.st_mtime = (time_t)asc_ul(hd->c_mtime, sizeof(hd->c_mtime),
          OCT);
      arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
#     ifdef NET2_STAT
      arcn->sb.st_size = (off_t)asc_ul(hd->c_filesize,sizeof(hd->c_filesize),
          OCT);
#     else
      arcn->sb.st_size = (off_t)asc_uqd(hd->c_filesize,sizeof(hd->c_filesize),
          OCT);
#     endif

      /*
       * check name size and if valid, read in the name of this entry (name
       * follows header in the archive)
       */
      if ((nsz = (int)asc_ul(hd->c_namesize,sizeof(hd->c_namesize),OCT)) < 2)
            return(-1);
      arcn->nlen = nsz - 1;
      if (rd_nm(arcn, nsz) < 0)
            return(-1);

      if (((arcn->sb.st_mode&C_IFMT) != C_ISLNK)||(arcn->sb.st_size == 0)) {
            /*
             * no link name to read for this file
             */
            arcn->ln_nlen = 0;
            arcn->ln_name[0] = '\0';
            return(com_rd(arcn));
      }

      /*
       * check link name size and read in the link name. Link names are
       * stored like file data.
       */
      if (rd_ln_nm(arcn) < 0)
            return(-1);

      /*
       * we have a valid header (with a link)
       */
      return(com_rd(arcn));
}

/*
 * cpio_endrd()
 *      no cleanup needed here, just return size of the trailer (for append)
 * Return:
 *      size of trailer header in this format
 */

#ifdef __STDC__
off_t
cpio_endrd(void)
#else
off_t
cpio_endrd()
#endif
{
      return((off_t)(sizeof(HD_CPIO) + sizeof(TRAILER)));
}

/*
 * cpio_stwr()
 *    start up the device mapping table
 * Return:
 *    0 if ok, -1 otherwise (what dev_start() returns)
 */

#ifdef __STDC__
int
cpio_stwr(void)
#else
int
cpio_stwr()
#endif
{
      return(dev_start());
}

/*
 * cpio_wr()
 *    copy the data in the ARCHD to buffer in extended byte oriented cpio
 *    format.
 * Return
 *      0 if file has data to be written after the header, 1 if file has NO
 *    data to write after the header, -1 if archive write failed
 */

#ifdef __STDC__
int
cpio_wr(register ARCHD *arcn)
#else
int
cpio_wr(arcn)
      register ARCHD *arcn;
#endif
{
      register HD_CPIO *hd;
      register int nsz;
      char hdblk[sizeof(HD_CPIO)];

      /*
       * check and repair truncated device and inode fields in the header
       */
      if (map_dev(arcn, (u_long)CPIO_MASK, (u_long)CPIO_MASK) < 0)
            return(-1);

      arcn->pad = 0L;
      nsz = arcn->nlen + 1;
      hd = (HD_CPIO *)hdblk;
      if ((arcn->type != PAX_BLK) && (arcn->type != PAX_CHR))
            arcn->sb.st_rdev = 0;

      switch(arcn->type) {
      case PAX_CTG:
      case PAX_REG:
      case PAX_HRG:
            /*
             * set data size for file data
             */
#           ifdef NET2_STAT
            if (ul_asc((u_long)arcn->sb.st_size, hd->c_filesize,
                sizeof(hd->c_filesize), OCT)) {
#           else
            if (uqd_asc((u_quad_t)arcn->sb.st_size, hd->c_filesize,
                sizeof(hd->c_filesize), OCT)) {
#           endif
                  paxwarn(1,"File is too large for cpio format %s",
                      arcn->org_name);
                  return(1);
            }
            break;
      case PAX_SLK:
            /*
             * set data size to hold link name
             */
            if (ul_asc((u_long)arcn->ln_nlen, hd->c_filesize,
                sizeof(hd->c_filesize), OCT))
                  goto out;
            break;
      default:
            /*
             * all other file types have no file data
             */
            if (ul_asc((u_long)0, hd->c_filesize, sizeof(hd->c_filesize),
                 OCT))
                  goto out;
            break;
      }

      /*
       * copy the values to the header using octal ascii
       */
      if (ul_asc((u_long)MAGIC, hd->c_magic, sizeof(hd->c_magic), OCT) ||
          ul_asc((u_long)arcn->sb.st_dev, hd->c_dev, sizeof(hd->c_dev),
            OCT) ||
          ul_asc((u_long)arcn->sb.st_ino, hd->c_ino, sizeof(hd->c_ino),
            OCT) ||
          ul_asc((u_long)arcn->sb.st_mode, hd->c_mode, sizeof(hd->c_mode),
            OCT) ||
          ul_asc((u_long)arcn->sb.st_uid, hd->c_uid, sizeof(hd->c_uid),
            OCT) ||
          ul_asc((u_long)arcn->sb.st_gid, hd->c_gid, sizeof(hd->c_gid),
            OCT) ||
          ul_asc((u_long)arcn->sb.st_nlink, hd->c_nlink, sizeof(hd->c_nlink),
             OCT) ||
          ul_asc((u_long)arcn->sb.st_rdev, hd->c_rdev, sizeof(hd->c_rdev),
            OCT) ||
          ul_asc((u_long)arcn->sb.st_mtime,hd->c_mtime,sizeof(hd->c_mtime),
            OCT) ||
          ul_asc((u_long)nsz, hd->c_namesize, sizeof(hd->c_namesize), OCT))
            goto out;

      /*
       * write the file name to the archive
       */
      if ((wr_rdbuf(hdblk, (int)sizeof(HD_CPIO)) < 0) ||
          (wr_rdbuf(arcn->name, nsz) < 0)) {
            paxwarn(1, "Unable to write cpio header for %s", arcn->org_name);
            return(-1);
      }

      /*
       * if this file has data, we are done. The caller will write the file
       * data, if we are link tell caller we are done, go to next file
       */
      if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG) ||
          (arcn->type == PAX_HRG))
            return(0);
      if (arcn->type != PAX_SLK)
            return(1);

      /*
       * write the link name to the archive, tell the caller to go to the
       * next file as we are done.
       */
      if (wr_rdbuf(arcn->ln_name, arcn->ln_nlen) < 0) {
            paxwarn(1,"Unable to write cpio link name for %s",arcn->org_name);
            return(-1);
      }
      return(1);

    out:
      /*
       * header field is out of range
       */
      paxwarn(1, "Cpio header field is too small to store file %s",
          arcn->org_name);
      return(1);
}

/*
 * Routines common to the system VR4 version of cpio (with/without file CRC)
 */

/*
 * vcpio_id()
 *      determine if a block given to us is a valid system VR4 cpio header
 *    WITHOUT crc. WATCH it the magic cookies are in OCTAL, the header 
 *    uses HEX
 * Return:
 *      0 if a valid header, -1 otherwise
 */

#ifdef __STDC__
int
vcpio_id(char *blk, int size)
#else
int
vcpio_id(blk, size)
      char *blk;
      int size;
#endif
{
      if ((size < sizeof(HD_VCPIO)) ||
          (strncmp(blk, AVMAGIC, sizeof(AVMAGIC) - 1) != 0))
            return(-1);
      return(0);
}

/*
 * crc_id()
 *      determine if a block given to us is a valid system VR4 cpio header
 *    WITH crc. WATCH it the magic cookies are in OCTAL the header uses HEX
 * Return:
 *      0 if a valid header, -1 otherwise
 */

#ifdef __STDC__
int
crc_id(char *blk, int size)
#else
int
crc_id(blk, size)
      char *blk;
      int size;
#endif
{
      if ((size < sizeof(HD_VCPIO)) ||
          (strncmp(blk, AVCMAGIC, sizeof(AVCMAGIC) - 1) != 0))
            return(-1);
      return(0);
}

/*
 * crc_strd()
 w    set file data CRC calculations. Fire up the hard link detection code
 * Return:
 *      0 if ok -1 otherwise (the return values of lnk_start())
 */

#ifdef __STDC__
int
crc_strd(void)
#else
int
crc_strd()
#endif
{
      docrc = 1;
      return(lnk_start());
}

/*
 * vcpio_rd()
 *    determine if a buffer is a system VR4 archive entry. (with/without CRC)
 *    convert and store the values in the ARCHD parameter.
 * Return:
 *    0 if a valid header, -1 otherwise.
 */

#ifdef __STDC__
int
vcpio_rd(register ARCHD *arcn, register char *buf)
#else
int
vcpio_rd(arcn, buf)
      register ARCHD *arcn;
      register char *buf;
#endif
{
      register HD_VCPIO *hd;
      dev_t devminor;
      dev_t devmajor;
      register int nsz;

      /*
       * during the id phase it was determined if we were using CRC, use the
       * proper id routine.
       */
      if (docrc) {
            if (crc_id(buf, sizeof(HD_VCPIO)) < 0)
                  return(-1);
      } else {
            if (vcpio_id(buf, sizeof(HD_VCPIO)) < 0)
                  return(-1);
      }

      hd = (HD_VCPIO *)buf;
      arcn->pad = 0L;

      /*
       * extract the hex ascii fields from the header
       */
      arcn->sb.st_ino = (ino_t)asc_ul(hd->c_ino, sizeof(hd->c_ino), HEX);
      arcn->sb.st_mode = (mode_t)asc_ul(hd->c_mode, sizeof(hd->c_mode), HEX);
      arcn->sb.st_uid = (uid_t)asc_ul(hd->c_uid, sizeof(hd->c_uid), HEX);
      arcn->sb.st_gid = (gid_t)asc_ul(hd->c_gid, sizeof(hd->c_gid), HEX);
      arcn->sb.st_mtime = (time_t)asc_ul(hd->c_mtime,sizeof(hd->c_mtime),HEX);
      arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
#     ifdef NET2_STAT
      arcn->sb.st_size = (off_t)asc_ul(hd->c_filesize,
          sizeof(hd->c_filesize), HEX);
#     else
      arcn->sb.st_size = (off_t)asc_uqd(hd->c_filesize,
          sizeof(hd->c_filesize), HEX);
#     endif
      arcn->sb.st_nlink = (nlink_t)asc_ul(hd->c_nlink, sizeof(hd->c_nlink),
          HEX);
      devmajor = (dev_t)asc_ul(hd->c_maj, sizeof(hd->c_maj), HEX);
      devminor = (dev_t)asc_ul(hd->c_min, sizeof(hd->c_min), HEX);
      arcn->sb.st_dev = TODEV(devmajor, devminor);
      devmajor = (dev_t)asc_ul(hd->c_rmaj, sizeof(hd->c_maj), HEX);
      devminor = (dev_t)asc_ul(hd->c_rmin, sizeof(hd->c_min), HEX);
      arcn->sb.st_rdev = TODEV(devmajor, devminor);
      arcn->crc = asc_ul(hd->c_chksum, sizeof(hd->c_chksum), HEX);

      /*
       * check the length of the file name, if ok read it in, return -1 if
       * bogus
       */
      if ((nsz = (int)asc_ul(hd->c_namesize,sizeof(hd->c_namesize),HEX)) < 2)
            return(-1);
      arcn->nlen = nsz - 1;
      if (rd_nm(arcn, nsz) < 0)
            return(-1);

      /*
       * skip padding. header + filename is aligned to 4 byte boundries
       */
      if (rd_skip((off_t)(VCPIO_PAD(sizeof(HD_VCPIO) + nsz))) < 0)
            return(-1);

      /*
       * if not a link (or a file with no data), calculate pad size (for
       * padding which follows the file data), clear the link name and return
       */
      if (((arcn->sb.st_mode&C_IFMT) != C_ISLNK)||(arcn->sb.st_size == 0)) {
            /*
             * we have a valid header (not a link)
             */
            arcn->ln_nlen = 0;
            arcn->ln_name[0] = '\0';
            arcn->pad = VCPIO_PAD(arcn->sb.st_size);
            return(com_rd(arcn));
      }

      /*
       * read in the link name and skip over the padding
       */
      if ((rd_ln_nm(arcn) < 0) ||
          (rd_skip((off_t)(VCPIO_PAD(arcn->sb.st_size))) < 0))
            return(-1);

      /*
       * we have a valid header (with a link)
       */
      return(com_rd(arcn));
}

/*
 * vcpio_endrd()
 *      no cleanup needed here, just return size of the trailer (for append)
 * Return:
 *      size of trailer header in this format
 */

#ifdef __STDC__
off_t
vcpio_endrd(void)
#else
off_t
vcpio_endrd()
#endif
{
      return((off_t)(sizeof(HD_VCPIO) + sizeof(TRAILER) +
            (VCPIO_PAD(sizeof(HD_VCPIO) + sizeof(TRAILER)))));
}

/*
 * crc_stwr()
 *    start up the device mapping table, enable crc file calculation
 * Return:
 *    0 if ok, -1 otherwise (what dev_start() returns)
 */

#ifdef __STDC__
int
crc_stwr(void)
#else
int
crc_stwr()
#endif
{
      docrc = 1;
      return(dev_start());
}

/*
 * vcpio_wr()
 *    copy the data in the ARCHD to buffer in system VR4 cpio
 *    (with/without crc) format.
 * Return
 *    0 if file has data to be written after the header, 1 if file has
 *    NO data to write after the header, -1 if archive write failed
 */

#ifdef __STDC__
int
vcpio_wr(register ARCHD *arcn)
#else
int
vcpio_wr(arcn)
      register ARCHD *arcn;
#endif
{
      register HD_VCPIO *hd;
      unsigned int nsz;
      char hdblk[sizeof(HD_VCPIO)];

      /*
       * check and repair truncated device and inode fields in the cpio
       * header
       */
      if (map_dev(arcn, (u_long)VCPIO_MASK, (u_long)VCPIO_MASK) < 0)
            return(-1);
      nsz = arcn->nlen + 1;
      hd = (HD_VCPIO *)hdblk;
      if ((arcn->type != PAX_BLK) && (arcn->type != PAX_CHR))
            arcn->sb.st_rdev = 0;

      /*
       * add the proper magic value depending whether we were asked for
       * file data crc's, and the crc if needed.
       */
      if (docrc) {
            if (ul_asc((u_long)VCMAGIC, hd->c_magic, sizeof(hd->c_magic),
                  OCT) ||
                ul_asc((u_long)arcn->crc,hd->c_chksum,sizeof(hd->c_chksum),
                  HEX))
                  goto out;
      } else {
            if (ul_asc((u_long)VMAGIC, hd->c_magic, sizeof(hd->c_magic),
                  OCT) ||
                ul_asc((u_long)0L, hd->c_chksum, sizeof(hd->c_chksum),HEX))
                  goto out;
      }

      switch(arcn->type) {
      case PAX_CTG:
      case PAX_REG:
      case PAX_HRG:
            /*
             * caller will copy file data to the archive. tell him how
             * much to pad.
             */
            arcn->pad = VCPIO_PAD(arcn->sb.st_size);
#           ifdef NET2_STAT
            if (ul_asc((u_long)arcn->sb.st_size, hd->c_filesize,
                sizeof(hd->c_filesize), HEX)) {
#           else
            if (uqd_asc((u_quad_t)arcn->sb.st_size, hd->c_filesize,
                sizeof(hd->c_filesize), HEX)) {
#           endif
                  paxwarn(1,"File is too large for sv4cpio format %s",
                      arcn->org_name);
                  return(1);
            }
            break;
      case PAX_SLK:
            /*
             * no file data for the caller to process, the file data has
             * the size of the link
             */
            arcn->pad = 0L;
            if (ul_asc((u_long)arcn->ln_nlen, hd->c_filesize,
                sizeof(hd->c_filesize), HEX))
                  goto out;
            break;
      default:
            /*
             * no file data for the caller to process
             */
            arcn->pad = 0L;
            if (ul_asc((u_long)0L, hd->c_filesize, sizeof(hd->c_filesize),
                HEX))
                  goto out;
            break;
      }

      /*
       * set the other fields in the header
       */
      if (ul_asc((u_long)arcn->sb.st_ino, hd->c_ino, sizeof(hd->c_ino),
            HEX) ||
          ul_asc((u_long)arcn->sb.st_mode, hd->c_mode, sizeof(hd->c_mode),
            HEX) ||
          ul_asc((u_long)arcn->sb.st_uid, hd->c_uid, sizeof(hd->c_uid),
            HEX) ||
          ul_asc((u_long)arcn->sb.st_gid, hd->c_gid, sizeof(hd->c_gid),
            HEX) ||
          ul_asc((u_long)arcn->sb.st_mtime, hd->c_mtime, sizeof(hd->c_mtime),
            HEX) ||
          ul_asc((u_long)arcn->sb.st_nlink, hd->c_nlink, sizeof(hd->c_nlink),
            HEX) ||
          ul_asc((u_long)MAJOR(arcn->sb.st_dev),hd->c_maj, sizeof(hd->c_maj),
            HEX) ||
          ul_asc((u_long)MINOR(arcn->sb.st_dev),hd->c_min, sizeof(hd->c_min),
            HEX) ||
          ul_asc((u_long)MAJOR(arcn->sb.st_rdev),hd->c_rmaj,sizeof(hd->c_maj),
            HEX) ||
          ul_asc((u_long)MINOR(arcn->sb.st_rdev),hd->c_rmin,sizeof(hd->c_min),
            HEX) ||
          ul_asc((u_long)nsz, hd->c_namesize, sizeof(hd->c_namesize), HEX))
            goto out;

      /*
       * write the header, the file name and padding as required.
       */
      if ((wr_rdbuf(hdblk, (int)sizeof(HD_VCPIO)) < 0) ||
          (wr_rdbuf(arcn->name, (int)nsz) < 0)  ||
          (wr_skip((off_t)(VCPIO_PAD(sizeof(HD_VCPIO) + nsz))) < 0)) {
            paxwarn(1,"Could not write sv4cpio header for %s",arcn->org_name);
            return(-1);
      }

      /*
       * if we have file data, tell the caller we are done, copy the file
       */
      if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG) ||
          (arcn->type == PAX_HRG))
            return(0);

      /*
       * if we are not a link, tell the caller we are done, go to next file
       */
      if (arcn->type != PAX_SLK)
            return(1);

      /*
       * write the link name, tell the caller we are done.
       */
      if ((wr_rdbuf(arcn->ln_name, arcn->ln_nlen) < 0) ||
          (wr_skip((off_t)(VCPIO_PAD(arcn->ln_nlen))) < 0)) {
            paxwarn(1,"Could not write sv4cpio link name for %s",
                arcn->org_name);
            return(-1);
      }
      return(1);

    out:
      /*
       * header field is out of range
       */
      paxwarn(1,"Sv4cpio header field is too small for file %s",arcn->org_name);
      return(1);
}

/*
 * Routines common to the old binary header cpio
 */

/*
 * bcpio_id()
 *      determine if a block given to us is a old binary cpio header
 *    (with/without header byte swapping)
 * Return:
 *      0 if a valid header, -1 otherwise
 */

#ifdef __STDC__
int
bcpio_id(char *blk, int size)
#else
int
bcpio_id(blk, size)
      char *blk;
      int size;
#endif
{
      if (size < sizeof(HD_BCPIO))
            return(-1);

      /*
       * check both normal and byte swapped magic cookies
       */
      if (((u_short)SHRT_EXT(blk)) == MAGIC)
            return(0);
      if (((u_short)RSHRT_EXT(blk)) == MAGIC) {
            if (!swp_head)
                  ++swp_head;
            return(0);
      }
      return(-1);
}

/*
 * bcpio_rd()
 *    determine if a buffer is a old binary archive entry. (it may have byte
 *    swapped header) convert and store the values in the ARCHD parameter.
 *    This is a very old header format and should not really be used.
 * Return:
 *    0 if a valid header, -1 otherwise.
 */

#ifdef __STDC__
int
bcpio_rd(register ARCHD *arcn, register char *buf)
#else
int
bcpio_rd(arcn, buf)
      register ARCHD *arcn;
      register char *buf;
#endif
{
      register HD_BCPIO *hd;
      register int nsz;

      /*
       * check the header
       */
      if (bcpio_id(buf, sizeof(HD_BCPIO)) < 0)
            return(-1);

      arcn->pad = 0L;
      hd = (HD_BCPIO *)buf;
      if (swp_head) {
            /*
             * header has swapped bytes on 16 bit boundries
             */
            arcn->sb.st_dev = (dev_t)(RSHRT_EXT(hd->h_dev));
            arcn->sb.st_ino = (ino_t)(RSHRT_EXT(hd->h_ino));
            arcn->sb.st_mode = (mode_t)(RSHRT_EXT(hd->h_mode));
            arcn->sb.st_uid = (uid_t)(RSHRT_EXT(hd->h_uid));
            arcn->sb.st_gid = (gid_t)(RSHRT_EXT(hd->h_gid));
            arcn->sb.st_nlink = (nlink_t)(RSHRT_EXT(hd->h_nlink));
            arcn->sb.st_rdev = (dev_t)(RSHRT_EXT(hd->h_rdev));
            arcn->sb.st_mtime = (time_t)(RSHRT_EXT(hd->h_mtime_1));
            arcn->sb.st_mtime =  (arcn->sb.st_mtime << 16) |
                  ((time_t)(RSHRT_EXT(hd->h_mtime_2)));
            arcn->sb.st_size = (off_t)(RSHRT_EXT(hd->h_filesize_1));
            arcn->sb.st_size = (arcn->sb.st_size << 16) |
                  ((off_t)(RSHRT_EXT(hd->h_filesize_2)));
            nsz = (int)(RSHRT_EXT(hd->h_namesize));
      } else {
            arcn->sb.st_dev = (dev_t)(SHRT_EXT(hd->h_dev));
            arcn->sb.st_ino = (ino_t)(SHRT_EXT(hd->h_ino));
            arcn->sb.st_mode = (mode_t)(SHRT_EXT(hd->h_mode));
            arcn->sb.st_uid = (uid_t)(SHRT_EXT(hd->h_uid));
            arcn->sb.st_gid = (gid_t)(SHRT_EXT(hd->h_gid));
            arcn->sb.st_nlink = (nlink_t)(SHRT_EXT(hd->h_nlink));
            arcn->sb.st_rdev = (dev_t)(SHRT_EXT(hd->h_rdev));
            arcn->sb.st_mtime = (time_t)(SHRT_EXT(hd->h_mtime_1));
            arcn->sb.st_mtime =  (arcn->sb.st_mtime << 16) |
                  ((time_t)(SHRT_EXT(hd->h_mtime_2)));
            arcn->sb.st_size = (off_t)(SHRT_EXT(hd->h_filesize_1));
            arcn->sb.st_size = (arcn->sb.st_size << 16) |
                  ((off_t)(SHRT_EXT(hd->h_filesize_2)));
            nsz = (int)(SHRT_EXT(hd->h_namesize));
      }
      arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;

      /*
       * check the file name size, if bogus give up. otherwise read the file
       * name
       */
      if (nsz < 2)
            return(-1);
      arcn->nlen = nsz - 1;
      if (rd_nm(arcn, nsz) < 0)
            return(-1);

      /*
       * header + file name are aligned to 2 byte boundries, skip if needed
       */
      if (rd_skip((off_t)(BCPIO_PAD(sizeof(HD_BCPIO) + nsz))) < 0)
            return(-1);

      /*
       * if not a link (or a file with no data), calculate pad size (for
       * padding which follows the file data), clear the link name and return
       */
      if (((arcn->sb.st_mode & C_IFMT) != C_ISLNK)||(arcn->sb.st_size == 0)){
            /*
             * we have a valid header (not a link)
             */
            arcn->ln_nlen = 0;
            arcn->ln_name[0] = '\0';
            arcn->pad = BCPIO_PAD(arcn->sb.st_size);
            return(com_rd(arcn));
      }

      if ((rd_ln_nm(arcn) < 0) ||
          (rd_skip((off_t)(BCPIO_PAD(arcn->sb.st_size))) < 0))
            return(-1);

      /*
       * we have a valid header (with a link)
       */
      return(com_rd(arcn));
}

/*
 * bcpio_endrd()
 *      no cleanup needed here, just return size of the trailer (for append)
 * Return:
 *      size of trailer header in this format
 */

#ifdef __STDC__
off_t
bcpio_endrd(void)
#else
off_t
bcpio_endrd()
#endif
{
      return((off_t)(sizeof(HD_BCPIO) + sizeof(TRAILER) +
            (BCPIO_PAD(sizeof(HD_BCPIO) + sizeof(TRAILER)))));
}

/*
 * bcpio_wr()
 *    copy the data in the ARCHD to buffer in old binary cpio format
 *    There is a real chance of field overflow with this critter. So we
 *    always check the conversion is ok. nobody in his their right mind
 *    should write an achive in this format...
 * Return
 *      0 if file has data to be written after the header, 1 if file has NO
 *    data to write after the header, -1 if archive write failed
 */

#ifdef __STDC__
int
bcpio_wr(register ARCHD *arcn)
#else
int
bcpio_wr(arcn)
      register ARCHD *arcn;
#endif
{
      register HD_BCPIO *hd;
      register int nsz;
      char hdblk[sizeof(HD_BCPIO)];
      off_t t_offt;
      int t_int;
      time_t t_timet;

      /*
       * check and repair truncated device and inode fields in the cpio
       * header
       */
      if (map_dev(arcn, (u_long)BCPIO_MASK, (u_long)BCPIO_MASK) < 0)
            return(-1);

      if ((arcn->type != PAX_BLK) && (arcn->type != PAX_CHR))
            arcn->sb.st_rdev = 0;
      hd = (HD_BCPIO *)hdblk;

      switch(arcn->type) {
      case PAX_CTG:
      case PAX_REG:
      case PAX_HRG:
            /*
             * caller will copy file data to the archive. tell him how
             * much to pad.
             */
            arcn->pad = BCPIO_PAD(arcn->sb.st_size);
            hd->h_filesize_1[0] = CHR_WR_0(arcn->sb.st_size);
            hd->h_filesize_1[1] = CHR_WR_1(arcn->sb.st_size);
            hd->h_filesize_2[0] = CHR_WR_2(arcn->sb.st_size);
            hd->h_filesize_2[1] = CHR_WR_3(arcn->sb.st_size);
            t_offt = (off_t)(SHRT_EXT(hd->h_filesize_1));
            t_offt = (t_offt<<16) | ((off_t)(SHRT_EXT(hd->h_filesize_2)));
            if (arcn->sb.st_size != t_offt) {
                  paxwarn(1,"File is too large for bcpio format %s",
                      arcn->org_name);
                  return(1);
            }
            break;
      case PAX_SLK:
            /*
             * no file data for the caller to process, the file data has
             * the size of the link
             */
            arcn->pad = 0L;
            hd->h_filesize_1[0] = CHR_WR_0(arcn->ln_nlen);
            hd->h_filesize_1[1] = CHR_WR_1(arcn->ln_nlen);
            hd->h_filesize_2[0] = CHR_WR_2(arcn->ln_nlen);
            hd->h_filesize_2[1] = CHR_WR_3(arcn->ln_nlen);
            t_int = (int)(SHRT_EXT(hd->h_filesize_1));
            t_int = (t_int << 16) | ((int)(SHRT_EXT(hd->h_filesize_2)));
            if (arcn->ln_nlen != t_int)
                  goto out;
            break;
      default:
            /*
             * no file data for the caller to process
             */
            arcn->pad = 0L;
            hd->h_filesize_1[0] = (char)0;
            hd->h_filesize_1[1] = (char)0;
            hd->h_filesize_2[0] = (char)0;
            hd->h_filesize_2[1] = (char)0;
            break;
      }

      /*
       * build up the rest of the fields
       */
      hd->h_magic[0] = CHR_WR_2(MAGIC);
      hd->h_magic[1] = CHR_WR_3(MAGIC);
      hd->h_dev[0] = CHR_WR_2(arcn->sb.st_dev);
      hd->h_dev[1] = CHR_WR_3(arcn->sb.st_dev);
      if (arcn->sb.st_dev != (dev_t)(SHRT_EXT(hd->h_dev)))
            goto out;
      hd->h_ino[0] = CHR_WR_2(arcn->sb.st_ino);
      hd->h_ino[1] = CHR_WR_3(arcn->sb.st_ino);
      if (arcn->sb.st_ino != (ino_t)(SHRT_EXT(hd->h_ino)))
            goto out;
      hd->h_mode[0] = CHR_WR_2(arcn->sb.st_mode);
      hd->h_mode[1] = CHR_WR_3(arcn->sb.st_mode);
      if (arcn->sb.st_mode != (mode_t)(SHRT_EXT(hd->h_mode)))
            goto out;
      hd->h_uid[0] = CHR_WR_2(arcn->sb.st_uid);
      hd->h_uid[1] = CHR_WR_3(arcn->sb.st_uid);
      if (arcn->sb.st_uid != (uid_t)(SHRT_EXT(hd->h_uid)))
            goto out;
      hd->h_gid[0] = CHR_WR_2(arcn->sb.st_gid);
      hd->h_gid[1] = CHR_WR_3(arcn->sb.st_gid);
      if (arcn->sb.st_gid != (gid_t)(SHRT_EXT(hd->h_gid)))
            goto out;
      hd->h_nlink[0] = CHR_WR_2(arcn->sb.st_nlink);
      hd->h_nlink[1] = CHR_WR_3(arcn->sb.st_nlink);
      if (arcn->sb.st_nlink != (nlink_t)(SHRT_EXT(hd->h_nlink)))
            goto out;
      hd->h_rdev[0] = CHR_WR_2(arcn->sb.st_rdev);
      hd->h_rdev[1] = CHR_WR_3(arcn->sb.st_rdev);
      if (arcn->sb.st_rdev != (dev_t)(SHRT_EXT(hd->h_rdev)))
            goto out;
      hd->h_mtime_1[0] = CHR_WR_0(arcn->sb.st_mtime);
      hd->h_mtime_1[1] = CHR_WR_1(arcn->sb.st_mtime);
      hd->h_mtime_2[0] = CHR_WR_2(arcn->sb.st_mtime);
      hd->h_mtime_2[1] = CHR_WR_3(arcn->sb.st_mtime);
      t_timet = (time_t)(SHRT_EXT(hd->h_mtime_1));
      t_timet =  (t_timet << 16) | ((time_t)(SHRT_EXT(hd->h_mtime_2)));
      if (arcn->sb.st_mtime != t_timet)
            goto out;
      nsz = arcn->nlen + 1;
      hd->h_namesize[0] = CHR_WR_2(nsz);
      hd->h_namesize[1] = CHR_WR_3(nsz);
      if (nsz != (int)(SHRT_EXT(hd->h_namesize)))
            goto out;

      /*
       * write the header, the file name and padding as required.
       */
      if ((wr_rdbuf(hdblk, (int)sizeof(HD_BCPIO)) < 0) ||
          (wr_rdbuf(arcn->name, nsz) < 0) ||
          (wr_skip((off_t)(BCPIO_PAD(sizeof(HD_BCPIO) + nsz))) < 0)) {
            paxwarn(1, "Could not write bcpio header for %s", arcn->org_name);
            return(-1);
      }

      /*
       * if we have file data, tell the caller we are done
       */
      if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG) ||
          (arcn->type == PAX_HRG))
            return(0);

      /*
       * if we are not a link, tell the caller we are done, go to next file
       */
      if (arcn->type != PAX_SLK)
            return(1);

      /*
       * write the link name, tell the caller we are done.
       */
      if ((wr_rdbuf(arcn->ln_name, arcn->ln_nlen) < 0) ||
          (wr_skip((off_t)(BCPIO_PAD(arcn->ln_nlen))) < 0)) {
            paxwarn(1,"Could not write bcpio link name for %s",arcn->org_name);
            return(-1);
      }
      return(1);

    out:
      /*
       * header field is out of range
       */
      paxwarn(1,"Bcpio header field is too small for file %s", arcn->org_name);
      return(1);
}

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