projects / libgit2.git / blame
| Commit | Line | Data |
|---|---|---|
| 4bc1a30f MS |
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 | } |