Merge remote-tracking branch 'remotes/kraxel/tags/pull-vga-20170103-1' into staging
[qemu.git] / block / dmg-bz2.c
1 /*
2 * DMG bzip2 uncompression
3 *
4 * Copyright (c) 2004 Johannes E. Schindelin
5 * Copyright (c) 2016 Red Hat, Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25 #include "qemu/osdep.h"
26 #include "qemu-common.h"
27 #include "dmg.h"
28 #include <bzlib.h>
29
30 static int dmg_uncompress_bz2_do(char *next_in, unsigned int avail_in,
31 char *next_out, unsigned int avail_out)
32 {
33 int ret;
34 uint64_t total_out;
35 bz_stream bzstream = {};
36
37 ret = BZ2_bzDecompressInit(&bzstream, 0, 0);
38 if (ret != BZ_OK) {
39 return -1;
40 }
41 bzstream.next_in = next_in;
42 bzstream.avail_in = avail_in;
43 bzstream.next_out = next_out;
44 bzstream.avail_out = avail_out;
45 ret = BZ2_bzDecompress(&bzstream);
46 total_out = ((uint64_t)bzstream.total_out_hi32 << 32) +
47 bzstream.total_out_lo32;
48 BZ2_bzDecompressEnd(&bzstream);
49 if (ret != BZ_STREAM_END ||
50 total_out != avail_out) {
51 return -1;
52 }
53 return 0;
54 }
55
56 __attribute__((constructor))
57 static void dmg_bz2_init(void)
58 {
59 assert(!dmg_uncompress_bz2);
60 dmg_uncompress_bz2 = dmg_uncompress_bz2_do;
61 }