Annotation of src/usr.bin/gzip/unbzip2.c, Revision 1.11
1.11 ! martin 1: /* $NetBSD: unbzip2.c,v 1.10 2006/10/03 08:20:03 simonb Exp $ */
1.10 simonb 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: *
19: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29: * POSSIBILITY OF SUCH DAMAGE.
30: */
1.1 mrg 31:
32: /* This file is #included by gzip.c */
33:
34: static off_t
1.4 mrg 35: unbzip2(int in, int out, char *pre, size_t prelen, off_t *bytes_in)
1.1 mrg 36: {
1.4 mrg 37: int ret, end_of_file;
1.1 mrg 38: off_t bytes_out = 0;
1.3 mrg 39: bz_stream bzs;
40: static char *inbuf, *outbuf;
1.1 mrg 41:
1.6 dsl 42: if (inbuf == NULL)
43: inbuf = malloc(BUFLEN);
44: if (outbuf == NULL)
45: outbuf = malloc(BUFLEN);
46: if (inbuf == NULL || outbuf == NULL)
1.5 mrg 47: maybe_err("malloc");
1.3 mrg 48:
49: bzs.bzalloc = NULL;
50: bzs.bzfree = NULL;
51: bzs.opaque = NULL;
52:
53: end_of_file = 0;
54: ret = BZ2_bzDecompressInit(&bzs, 0, 0);
55: if (ret != BZ_OK)
1.5 mrg 56: maybe_errx("bzip2 init");
1.3 mrg 57:
1.4 mrg 58: /* Prepend. */
59: bzs.avail_in = prelen;
60: bzs.next_in = pre;
61:
62: if (bytes_in)
63: *bytes_in = prelen;
1.3 mrg 64:
1.9 mrg 65: while (ret >= BZ_OK && ret != BZ_STREAM_END) {
1.3 mrg 66: if (bzs.avail_in == 0 && !end_of_file) {
1.8 mrg 67: ssize_t n;
68:
1.4 mrg 69: n = read(in, inbuf, BUFLEN);
1.3 mrg 70: if (n < 0)
1.5 mrg 71: maybe_err("read");
1.3 mrg 72: if (n == 0)
73: end_of_file = 1;
74: bzs.next_in = inbuf;
75: bzs.avail_in = n;
1.4 mrg 76: if (bytes_in)
77: *bytes_in += n;
78: }
1.3 mrg 79:
80: bzs.next_out = outbuf;
1.4 mrg 81: bzs.avail_out = BUFLEN;
1.3 mrg 82: ret = BZ2_bzDecompress(&bzs);
83:
84: switch (ret) {
85: case BZ_STREAM_END:
86: case BZ_OK:
87: if (ret == BZ_OK && end_of_file)
1.5 mrg 88: maybe_err("read");
1.3 mrg 89: if (!tflag) {
1.8 mrg 90: ssize_t n;
91:
1.4 mrg 92: n = write(out, outbuf, BUFLEN - bzs.avail_out);
1.3 mrg 93: if (n < 0)
1.5 mrg 94: maybe_err("write");
1.8 mrg 95: bytes_out += n;
1.3 mrg 96: }
97: break;
98:
99: case BZ_DATA_ERROR:
1.6 dsl 100: maybe_warnx("bzip2 data integrity error");
1.5 mrg 101: break;
102:
1.3 mrg 103: case BZ_DATA_ERROR_MAGIC:
1.6 dsl 104: maybe_warnx("bzip2 magic number error");
1.5 mrg 105: break;
106:
1.3 mrg 107: case BZ_MEM_ERROR:
1.6 dsl 108: maybe_warnx("bzip2 out of memory");
1.5 mrg 109: break;
110:
1.3 mrg 111: }
112: }
1.1 mrg 113:
1.5 mrg 114: if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK)
115: return (-1);
1.1 mrg 116:
117: return (bytes_out);
118: }
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