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unbzip2.c revision 1.10 
      1  1.10  simonb /*	$NetBSD: unbzip2.c,v 1.10 2006/10/03 08:20:03 simonb Exp $	*/
      2  1.10  simonb 
      3  1.10  simonb /*-
      4  1.10  simonb  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  1.10  simonb  * All rights reserved.
      6  1.10  simonb  *
      7  1.10  simonb  * This code is derived from software contributed to The NetBSD Foundation
      8  1.10  simonb  * by Simon Burge.
      9  1.10  simonb  *
     10  1.10  simonb  * Redistribution and use in source and binary forms, with or without
     11  1.10  simonb  * modification, are permitted provided that the following conditions
     12  1.10  simonb  * are met:
     13  1.10  simonb  * 1. Redistributions of source code must retain the above copyright
     14  1.10  simonb  *    notice, this list of conditions and the following disclaimer.
     15  1.10  simonb  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.10  simonb  *    notice, this list of conditions and the following disclaimer in the
     17  1.10  simonb  *    documentation and/or other materials provided with the distribution.
     18  1.10  simonb  * 3. All advertising materials mentioning features or use of this software
     19  1.10  simonb  *    must display the following acknowledgement:
     20  1.10  simonb  *        This product includes software developed by the NetBSD
     21  1.10  simonb  *        Foundation, Inc. and its contributors.
     22  1.10  simonb  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  1.10  simonb  *    contributors may be used to endorse or promote products derived
     24  1.10  simonb  *    from this software without specific prior written permission.
     25  1.10  simonb  *
     26  1.10  simonb  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  1.10  simonb  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  1.10  simonb  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  1.10  simonb  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  1.10  simonb  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  1.10  simonb  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  1.10  simonb  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  1.10  simonb  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  1.10  simonb  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  1.10  simonb  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  1.10  simonb  * POSSIBILITY OF SUCH DAMAGE.
     37  1.10  simonb  */
     38   1.1     mrg 
     39   1.1     mrg /* This file is #included by gzip.c */
     40   1.1     mrg 
     41   1.1     mrg static off_t
     42   1.4     mrg unbzip2(int in, int out, char *pre, size_t prelen, off_t *bytes_in)
     43   1.1     mrg {
     44   1.4     mrg 	int		ret, end_of_file;
     45   1.1     mrg 	off_t		bytes_out = 0;
     46   1.3     mrg 	bz_stream	bzs;
     47   1.3     mrg 	static char	*inbuf, *outbuf;
     48   1.1     mrg 
     49   1.6     dsl 	if (inbuf == NULL)
     50   1.6     dsl 		inbuf = malloc(BUFLEN);
     51   1.6     dsl 	if (outbuf == NULL)
     52   1.6     dsl 		outbuf = malloc(BUFLEN);
     53   1.6     dsl 	if (inbuf == NULL || outbuf == NULL)
     54   1.5     mrg 	        maybe_err("malloc");
     55   1.3     mrg 
     56   1.3     mrg 	bzs.bzalloc = NULL;
     57   1.3     mrg 	bzs.bzfree = NULL;
     58   1.3     mrg 	bzs.opaque = NULL;
     59   1.3     mrg 
     60   1.3     mrg 	end_of_file = 0;
     61   1.3     mrg 	ret = BZ2_bzDecompressInit(&bzs, 0, 0);
     62   1.3     mrg 	if (ret != BZ_OK)
     63   1.5     mrg 	        maybe_errx("bzip2 init");
     64   1.3     mrg 
     65   1.4     mrg 	/* Prepend. */
     66   1.4     mrg 	bzs.avail_in = prelen;
     67   1.4     mrg 	bzs.next_in = pre;
     68   1.4     mrg 
     69   1.4     mrg 	if (bytes_in)
     70   1.4     mrg 		*bytes_in = prelen;
     71   1.3     mrg 
     72   1.9     mrg 	while (ret >= BZ_OK && ret != BZ_STREAM_END) {
     73   1.3     mrg 	        if (bzs.avail_in == 0 && !end_of_file) {
     74   1.8     mrg 			ssize_t	n;
     75   1.8     mrg 
     76   1.4     mrg 	                n = read(in, inbuf, BUFLEN);
     77   1.3     mrg 	                if (n < 0)
     78   1.5     mrg 	                        maybe_err("read");
     79   1.3     mrg 	                if (n == 0)
     80   1.3     mrg 	                        end_of_file = 1;
     81   1.3     mrg 	                bzs.next_in = inbuf;
     82   1.3     mrg 	                bzs.avail_in = n;
     83   1.4     mrg 			if (bytes_in)
     84   1.4     mrg 				*bytes_in += n;
     85   1.4     mrg 	        }
     86   1.3     mrg 
     87   1.3     mrg 	        bzs.next_out = outbuf;
     88   1.4     mrg 	        bzs.avail_out = BUFLEN;
     89   1.3     mrg 	        ret = BZ2_bzDecompress(&bzs);
     90   1.3     mrg 
     91   1.3     mrg 	        switch (ret) {
     92   1.3     mrg 	        case BZ_STREAM_END:
     93   1.3     mrg 	        case BZ_OK:
     94   1.3     mrg 	                if (ret == BZ_OK && end_of_file)
     95   1.5     mrg 	                        maybe_err("read");
     96   1.3     mrg 	                if (!tflag) {
     97   1.8     mrg 				ssize_t	n;
     98   1.8     mrg 
     99   1.4     mrg 	                        n = write(out, outbuf, BUFLEN - bzs.avail_out);
    100   1.3     mrg 	                        if (n < 0)
    101   1.5     mrg 	                                maybe_err("write");
    102   1.8     mrg 	                	bytes_out += n;
    103   1.3     mrg 	                }
    104   1.3     mrg 	                break;
    105   1.3     mrg 
    106   1.3     mrg 	        case BZ_DATA_ERROR:
    107   1.6     dsl 	                maybe_warnx("bzip2 data integrity error");
    108   1.5     mrg 			break;
    109   1.5     mrg 
    110   1.3     mrg 	        case BZ_DATA_ERROR_MAGIC:
    111   1.6     dsl 	                maybe_warnx("bzip2 magic number error");
    112   1.5     mrg 			break;
    113   1.5     mrg 
    114   1.3     mrg 	        case BZ_MEM_ERROR:
    115   1.6     dsl 	                maybe_warnx("bzip2 out of memory");
    116   1.5     mrg 			break;
    117   1.5     mrg 
    118   1.3     mrg 	        }
    119   1.3     mrg 	}
    120   1.1     mrg 
    121   1.5     mrg 	if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK)
    122   1.5     mrg 	        return (-1);
    123   1.1     mrg 
    124   1.1     mrg 	return (bytes_out);
    125   1.1     mrg }
    126