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unbzip2.c revision 1.10 
      1 /*	$NetBSD: unbzip2.c,v 1.10 2006/10/03 08:20:03 simonb Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Simon Burge.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /* This file is #included by gzip.c */
     40 
     41 static off_t
     42 unbzip2(int in, int out, char *pre, size_t prelen, off_t *bytes_in)
     43 {
     44 	int		ret, end_of_file;
     45 	off_t		bytes_out = 0;
     46 	bz_stream	bzs;
     47 	static char	*inbuf, *outbuf;
     48 
     49 	if (inbuf == NULL)
     50 		inbuf = malloc(BUFLEN);
     51 	if (outbuf == NULL)
     52 		outbuf = malloc(BUFLEN);
     53 	if (inbuf == NULL || outbuf == NULL)
     54 	        maybe_err("malloc");
     55 
     56 	bzs.bzalloc = NULL;
     57 	bzs.bzfree = NULL;
     58 	bzs.opaque = NULL;
     59 
     60 	end_of_file = 0;
     61 	ret = BZ2_bzDecompressInit(&bzs, 0, 0);
     62 	if (ret != BZ_OK)
     63 	        maybe_errx("bzip2 init");
     64 
     65 	/* Prepend. */
     66 	bzs.avail_in = prelen;
     67 	bzs.next_in = pre;
     68 
     69 	if (bytes_in)
     70 		*bytes_in = prelen;
     71 
     72 	while (ret >= BZ_OK && ret != BZ_STREAM_END) {
     73 	        if (bzs.avail_in == 0 && !end_of_file) {
     74 			ssize_t	n;
     75 
     76 	                n = read(in, inbuf, BUFLEN);
     77 	                if (n < 0)
     78 	                        maybe_err("read");
     79 	                if (n == 0)
     80 	                        end_of_file = 1;
     81 	                bzs.next_in = inbuf;
     82 	                bzs.avail_in = n;
     83 			if (bytes_in)
     84 				*bytes_in += n;
     85 	        }
     86 
     87 	        bzs.next_out = outbuf;
     88 	        bzs.avail_out = BUFLEN;
     89 	        ret = BZ2_bzDecompress(&bzs);
     90 
     91 	        switch (ret) {
     92 	        case BZ_STREAM_END:
     93 	        case BZ_OK:
     94 	                if (ret == BZ_OK && end_of_file)
     95 	                        maybe_err("read");
     96 	                if (!tflag) {
     97 				ssize_t	n;
     98 
     99 	                        n = write(out, outbuf, BUFLEN - bzs.avail_out);
    100 	                        if (n < 0)
    101 	                                maybe_err("write");
    102 	                	bytes_out += n;
    103 	                }
    104 	                break;
    105 
    106 	        case BZ_DATA_ERROR:
    107 	                maybe_warnx("bzip2 data integrity error");
    108 			break;
    109 
    110 	        case BZ_DATA_ERROR_MAGIC:
    111 	                maybe_warnx("bzip2 magic number error");
    112 			break;
    113 
    114 	        case BZ_MEM_ERROR:
    115 	                maybe_warnx("bzip2 out of memory");
    116 			break;
    117 
    118 	        }
    119 	}
    120 
    121 	if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK)
    122 	        return (-1);
    123 
    124 	return (bytes_out);
    125 }
    126