File:
[ELWIX - Embedded LightWeight unIX -] /
embedaddon /
sudo /
zlib /
compress.c
Revision
1.1.1.1 (vendor branch):
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Mon Jul 22 10:46:14 2013 UTC (11 years, 1 month ago) by
misho
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CVS tags:
v1_8_8p0,
v1_8_8,
v1_8_7p0,
v1_8_7,
v1_8_5p1,
v1_8_3p2,
v1_8_10p3_0,
v1_8_10p3,
HEAD
1.8.7
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: compress.c,v 1.1.1.1 2013/07/22 10:46:14 misho Exp $ */
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: }
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