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1 | /* |
2 | * Copyright (C) 2009-2012 the libgit2 contributors | |
3 | * | |
4 | * This file is part of libgit2, distributed under the GNU GPL v2 with | |
5 | * a Linking Exception. For full terms see the included COPYING file. | |
6 | */ | |
7 | ||
8 | #include "compress.h" | |
9 | ||
10 | #include <zlib.h> | |
11 | ||
12 | #define BUFFER_SIZE (1024 * 1024) | |
13 | ||
14 | int git__compress(git_buf *buf, const void *buff, size_t len) | |
15 | { | |
16 | z_stream zs; | |
17 | char *zb; | |
18 | size_t have; | |
19 | ||
20 | memset(&zs, 0, sizeof(zs)); | |
21 | if (deflateInit(&zs, Z_DEFAULT_COMPRESSION) != Z_OK) | |
22 | return -1; | |
23 | ||
24 | zb = git__malloc(BUFFER_SIZE); | |
25 | GITERR_CHECK_ALLOC(zb); | |
26 | ||
27 | zs.next_in = (void *)buff; | |
28 | zs.avail_in = (uInt)len; | |
29 | ||
30 | do { | |
31 | zs.next_out = (unsigned char *)zb; | |
32 | zs.avail_out = BUFFER_SIZE; | |
33 | ||
34 | if (deflate(&zs, Z_FINISH) == Z_STREAM_ERROR) { | |
35 | git__free(zb); | |
36 | return -1; | |
37 | } | |
38 | ||
39 | have = BUFFER_SIZE - (size_t)zs.avail_out; | |
40 | ||
41 | if (git_buf_put(buf, zb, have) < 0) { | |
42 | git__free(zb); | |
43 | return -1; | |
44 | } | |
45 | ||
46 | } while (zs.avail_out == 0); | |
47 | ||
48 | assert(zs.avail_in == 0); | |
49 | ||
50 | deflateEnd(&zs); | |
51 | git__free(zb); | |
52 | return 0; | |
53 | } |