cpio.c

早期freebsd实现

		/*
		 * 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)) {
		warn(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)) {
		warn(1,"Could not write sv4cpio link name for %s",
		    arcn->org_name);
		return(-1);
	}
	return(1);

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

#if __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.
 */

#if __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
 */

#if __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
 */

#if __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) {
			warn(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)) {
		warn(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)) {
		warn(1,"Could not write bcpio link name for %s",arcn->org_name);
		return(-1);
	}
	return(1);

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