zenilib: zenilib/jni/external/zlib/compress.c Source File

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compress.c
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1 /* compress.c -- compress a memory buffer
2 * Copyright (C) 1995-2005 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6 /* @(#) $Id$ */
7
8 #define ZLIB_INTERNAL
9 #include "zlib.h"
10
11 /* ===========================================================================
12 Compresses the source buffer into the destination buffer. The level
13 parameter has the same meaning as in deflateInit. sourceLen is the byte
14 length of the source buffer. Upon entry, destLen is the total size of the
15 destination buffer, which must be at least 0.1% larger than sourceLen plus
16 12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
17
18 compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
19 memory, Z_BUF_ERROR if there was not enough room in the output buffer,
20 Z_STREAM_ERROR if the level parameter is invalid.
21 */
22 int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
23 Bytef *dest;
24 uLongf *destLen;
25 const Bytef *source;
26 uLong sourceLen;
27 int level;
28 {
29 z_stream stream;
30 int err;
31
32 stream.next_in = (Bytef*)source;
33 stream.avail_in = (uInt)sourceLen;
34 #ifdef MAXSEG_64K
35 /* Check for source > 64K on 16-bit machine: */
36 if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
37 #endif
38 stream.next_out = dest;
39 stream.avail_out = (uInt)*destLen;
40 if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
41
42 stream.zalloc = (alloc_func)0;
43 stream.zfree = (free_func)0;
44 stream.opaque = (voidpf)0;
45
46 err = deflateInit(&stream, level);
47 if (err != Z_OK) return err;
48
49 err = deflate(&stream, Z_FINISH);
50 if (err != Z_STREAM_END) {
51 deflateEnd(&stream);
52 return err == Z_OK ? Z_BUF_ERROR : err;
53 }
54 *destLen = stream.total_out;
55
56 err = deflateEnd(&stream);
57 return err;
58 }
59
60 /* ===========================================================================
61 */
62 int ZEXPORT compress (dest, destLen, source, sourceLen)
63 Bytef *dest;
64 uLongf *destLen;
65 const Bytef *source;
66 uLong sourceLen;
67 {
68 return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
69 }
70
71 /* ===========================================================================
72 If the default memLevel or windowBits for deflateInit() is changed, then
73 this function needs to be updated.
74 */
75 uLong ZEXPORT compressBound (sourceLen)
76 uLong sourceLen;
77 {
78 return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
79 (sourceLen >> 25) + 13;
80 }
compressBound
uLong ZEXPORT compressBound(uLong sourceLen)
Definition: compress.c:75
uLong
unsigned long uLong
Definition: zconf.h:222
uLongf
uLong FAR uLongf
Definition: zconf.h:233
Bytef
Byte FAR Bytef
Definition: zconf.h:228
stream
GLuint GLuint stream
Definition: glew.h:6573
z_stream_s::avail_in
uInt avail_in
Definition: zlib.h:70
ZEXPORT
#define ZEXPORT(x)
Definition: zconf.h:202
deflateEnd
int ZEXPORT deflateEnd(z_streamp strm)
Definition: deflate.c:895
voidpf
Byte FAR * voidpf
Definition: zconf.h:239
Z_DEFAULT_COMPRESSION
#define Z_DEFAULT_COMPRESSION
Definition: zlib.h:148
uInt
unsigned int uInt
Definition: zconf.h:221
z_stream_s::opaque
voidpf opaque
Definition: zlib.h:82
Z_BUF_ERROR
#define Z_BUF_ERROR
Definition: zlib.h:139
z_stream_s::zfree
free_func zfree
Definition: zlib.h:81
Z_OK
#define Z_OK
Definition: zlib.h:132
deflateInit
#define deflateInit(strm, level)
Definition: zlib.h:815
Z_FINISH
#define Z_FINISH
Definition: zlib.h:129
compress2
int ZEXPORT compress2(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level)
Definition: compress.c:22
z_stream_s::zalloc
alloc_func zalloc
Definition: zlib.h:80
deflate
int ZEXPORT deflate(z_streamp strm, int flush)
Definition: deflate.c:582
z_stream_s::next_in
Bytef * next_in
Definition: zlib.h:69
z_stream_s::total_out
uLong total_out
Definition: zlib.h:75
Z_STREAM_END
#define Z_STREAM_END
Definition: zlib.h:133
const
#define const
Definition: zconf.h:91
compress
int ZEXPORT compress(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)
Definition: compress.c:62
level
GLint level
Definition: gl2ext.h:845
z_stream_s::avail_out
uInt avail_out
Definition: zlib.h:74
zlib.h
z_stream_s::next_out
Bytef * next_out
Definition: zlib.h:73
source
GLsizei GLsizei GLchar * source
Definition: gl2ext.h:994
z_stream_s
Definition: zlib.h:68