unbzip2.c revision 330449 
1/*	$NetBSD: unbzip2.c,v 1.14 2017/08/04 07:27:08 mrg Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
5 *
6 * Copyright (c) 2006 The NetBSD Foundation, Inc.
7 * All rights reserved.
8 *
9 * This code is derived from software contributed to The NetBSD Foundation
10 * by Simon Burge.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 *
33 * $FreeBSD: stable/11/usr.bin/gzip/unbzip2.c 330449 2018-03-05 07:26:05Z eadler $
34 */
35
36/* This file is #included by gzip.c */
37
38static off_t
39unbzip2(int in, int out, char *pre, size_t prelen, off_t *bytes_in)
40{
41	int		ret, end_of_file, cold = 0;
42	off_t		bytes_out = 0;
43	bz_stream	bzs;
44	static char	*inbuf, *outbuf;
45
46	if (inbuf == NULL)
47		inbuf = malloc(BUFLEN);
48	if (outbuf == NULL)
49		outbuf = malloc(BUFLEN);
50	if (inbuf == NULL || outbuf == NULL)
51	        maybe_err("malloc");
52
53	bzs.bzalloc = NULL;
54	bzs.bzfree = NULL;
55	bzs.opaque = NULL;
56
57	end_of_file = 0;
58	ret = BZ2_bzDecompressInit(&bzs, 0, 0);
59	if (ret != BZ_OK)
60	        maybe_errx("bzip2 init");
61
62	/* Prepend. */
63	bzs.avail_in = prelen;
64	bzs.next_in = pre;
65
66	if (bytes_in)
67		*bytes_in = prelen;
68
69	while (ret == BZ_OK) {
70		check_siginfo();
71	        if (bzs.avail_in == 0 && !end_of_file) {
72			ssize_t	n;
73
74	                n = read(in, inbuf, BUFLEN);
75	                if (n < 0)
76	                        maybe_err("read");
77	                if (n == 0)
78	                        end_of_file = 1;
79			infile_newdata(n);
80	                bzs.next_in = inbuf;
81	                bzs.avail_in = n;
82			if (bytes_in)
83				*bytes_in += n;
84	        }
85
86	        bzs.next_out = outbuf;
87	        bzs.avail_out = BUFLEN;
88	        ret = BZ2_bzDecompress(&bzs);
89
90	        switch (ret) {
91	        case BZ_STREAM_END:
92	        case BZ_OK:
93	                if (ret == BZ_OK && end_of_file) {
94				/*
95				 * If we hit this after a stream end, consider
96				 * it as the end of the whole file and don't
97				 * bail out.
98				 */
99				if (cold == 1)
100					ret = BZ_STREAM_END;
101				else
102					maybe_errx("truncated file");
103			}
104			cold = 0;
105	                if (!tflag && bzs.avail_out != BUFLEN) {
106				ssize_t	n;
107
108	                        n = write(out, outbuf, BUFLEN - bzs.avail_out);
109	                        if (n < 0)
110	                                maybe_err("write");
111	                	bytes_out += n;
112	                }
113			if (ret == BZ_STREAM_END && !end_of_file) {
114				if (BZ2_bzDecompressEnd(&bzs) != BZ_OK ||
115				    BZ2_bzDecompressInit(&bzs, 0, 0) != BZ_OK)
116					maybe_errx("bzip2 re-init");
117				cold = 1;
118				ret = BZ_OK;
119			}
120			break;
121
122	        case BZ_DATA_ERROR:
123	                maybe_warnx("bzip2 data integrity error");
124			break;
125
126	        case BZ_DATA_ERROR_MAGIC:
127	                maybe_warnx("bzip2 magic number error");
128			break;
129
130	        case BZ_MEM_ERROR:
131	                maybe_warnx("bzip2 out of memory");
132			break;
133
134		default:
135			maybe_warnx("unknown bzip2 error: %d", ret);
136			break;
137	        }
138	}
139
140	if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK)
141	        return (-1);
142
143	return (bytes_out);
144}
145
146