cpio.c

早期freebsd实现

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
 */

#if __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
			warn(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)) {
		warn(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) {
		warn(1,"Unable to write cpio link name for %s",arcn->org_name);
		return(-1);
	}
	return(1);

    out:
	/*
	 * header field is out of range
	 */
	warn(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
 */

#if __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
 */

#if __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())
 */

#if __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.
 */

#if __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
 */

#if __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)
 */

#if __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
 */

#if __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
			warn(1,"File is too large for sv4cpio format %s",
			    arcn->org_name);
			return(1);
		}
		break;
	case PAX_SLK: