1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/*-
* Copyright (c) 2008 Joerg Sonnenberger <joerg@NetBSD.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <nbcompat.h>
#if HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>
#endif
__RCSID("$NetBSD: decompress.c,v 1.1.4.1 2008/08/02 20:33:50 joerg Exp $");
#ifdef BOOTSTRAP
#include "lib.h"
int
decompress_buffer(const char *input, size_t input_len, char **output,
size_t *output_len)
{
return 0;
}
#else
#include <bzlib.h>
#if HAVE_ERR_H
#include <err.h>
#endif
#include <limits.h>
#include <stdlib.h>
#include <zlib.h>
#include "lib.h"
static void
decompress_bzip2(const char *in, size_t in_len, char **out, size_t *out_len)
{
bz_stream stream;
size_t output_produced;
if (in_len < SSIZE_MAX / 10)
*out_len = in_len * 10;
else
*out_len = in_len;
*out = xmalloc(*out_len + 1);
stream.next_in = (char *)in;
stream.avail_in = in_len;
stream.next_out = *out;
stream.avail_out = *out_len;
output_produced = 0;
stream.bzalloc = NULL;
stream.bzfree = NULL;
stream.opaque = NULL;
if (BZ2_bzDecompressInit(&stream, 0, 0) != BZ_OK)
errx(EXIT_FAILURE, "BZ2_bzDecompressInit failed");
for (;;) {
switch (BZ2_bzDecompress(&stream)) {
case BZ_STREAM_END:
if (BZ2_bzDecompressEnd(&stream) != Z_OK)
errx(EXIT_FAILURE, "inflateEnd failed");
output_produced = *out_len - stream.avail_out;
*out = xrealloc(*out, output_produced + 1);
*out_len = output_produced;
(*out)[*out_len] = '\0';
return;
case BZ_OK:
output_produced = *out_len - stream.avail_out;
if (*out_len <= SSIZE_MAX / 2)
*out_len *= 2;
else
errx(EXIT_FAILURE, "input too large");
*out = xrealloc(*out, *out_len + 1);
stream.next_out = *out + output_produced;
stream.avail_out = *out_len - output_produced;
break;
default:
errx(EXIT_FAILURE, "inflate failed");
}
}
}
static void
decompress_zlib(const char *in, size_t in_len, char **out, size_t *out_len)
{
z_stream stream;
size_t output_produced;
if (in_len < SSIZE_MAX / 10)
*out_len = in_len * 10;
else
*out_len = in_len;
*out = xmalloc(*out_len + 1);
stream.next_in = (unsigned char *)in;
stream.avail_in = in_len;
stream.next_out = (unsigned char *)*out;
stream.avail_out = *out_len;
output_produced = 0;
stream.zalloc = Z_NULL;
stream.zfree = Z_NULL;
stream.opaque = NULL;
if (inflateInit2(&stream, 47) != Z_OK)
errx(EXIT_FAILURE, "inflateInit failed");
for (;;) {
switch (inflate(&stream, Z_FINISH)) {
case Z_STREAM_END:
if (inflateEnd(&stream) != Z_OK)
errx(EXIT_FAILURE, "inflateEnd failed");
output_produced = *out_len - stream.avail_out;
*out = xrealloc(*out, output_produced + 1);
*out_len = output_produced;
(*out)[*out_len] = '\0';
return;
case Z_OK:
output_produced = *out_len - stream.avail_out;
if (*out_len < SSIZE_MAX / 2)
*out_len *= 2;
else if (*out_len == SSIZE_MAX - 1)
errx(EXIT_FAILURE, "input too large");
else
*out_len = SSIZE_MAX - 1;
*out = xrealloc(*out, *out_len + 1);
stream.next_out = (unsigned char *)*out + output_produced;
stream.avail_out = *out_len - output_produced;
break;
default:
errx(EXIT_FAILURE, "inflate failed");
}
}
}
int
decompress_buffer(const char *input, size_t input_len, char **output,
size_t *output_len)
{
if (input_len < 4)
return 0;
if (input[0] == 'B' && input[1] == 'Z' && input[2] == 'h' &&
input[3] >= '1' && input[3] <= '9') {
/* Normal bzip2. */
decompress_bzip2(input, input_len, output, output_len);
} else if (input[0] == 037 && (unsigned char)input[1] == 139 &&
input[2] == 8 && (input[3] & 0xe0) == 0) {
/* gzip header with Deflate method */
decompress_zlib(input, input_len, output, output_len);
} else /* plain text */
return 0;
return 1;
}
#endif /* BOOTSTRAP */
|
