lemon-project-template-glpk

annotate deps/glpk/src/zlib/compress.c @ 9:33de93886c88

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Import GLPK 4.47
author Alpar Juttner <alpar@cs.elte.hu>
date Sun, 06 Nov 2011 20:59:10 +0100
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alpar@9 1 /* compress.c -- compress a memory buffer
alpar@9 2 * Copyright (C) 1995-2005 Jean-loup Gailly.
alpar@9 3 * For conditions of distribution and use, see copyright notice in zlib.h
alpar@9 4 */
alpar@9 5
alpar@9 6 /* @(#) $Id$ */
alpar@9 7
alpar@9 8 #define ZLIB_INTERNAL
alpar@9 9 #include "zlib.h"
alpar@9 10
alpar@9 11 /* ===========================================================================
alpar@9 12 Compresses the source buffer into the destination buffer. The level
alpar@9 13 parameter has the same meaning as in deflateInit. sourceLen is the byte
alpar@9 14 length of the source buffer. Upon entry, destLen is the total size of the
alpar@9 15 destination buffer, which must be at least 0.1% larger than sourceLen plus
alpar@9 16 12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
alpar@9 17
alpar@9 18 compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
alpar@9 19 memory, Z_BUF_ERROR if there was not enough room in the output buffer,
alpar@9 20 Z_STREAM_ERROR if the level parameter is invalid.
alpar@9 21 */
alpar@9 22 int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
alpar@9 23 Bytef *dest;
alpar@9 24 uLongf *destLen;
alpar@9 25 const Bytef *source;
alpar@9 26 uLong sourceLen;
alpar@9 27 int level;
alpar@9 28 {
alpar@9 29 z_stream stream;
alpar@9 30 int err;
alpar@9 31
alpar@9 32 stream.next_in = (Bytef*)source;
alpar@9 33 stream.avail_in = (uInt)sourceLen;
alpar@9 34 #ifdef MAXSEG_64K
alpar@9 35 /* Check for source > 64K on 16-bit machine: */
alpar@9 36 if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
alpar@9 37 #endif
alpar@9 38 stream.next_out = dest;
alpar@9 39 stream.avail_out = (uInt)*destLen;
alpar@9 40 if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
alpar@9 41
alpar@9 42 stream.zalloc = (alloc_func)0;
alpar@9 43 stream.zfree = (free_func)0;
alpar@9 44 stream.opaque = (voidpf)0;
alpar@9 45
alpar@9 46 err = deflateInit(&stream, level);
alpar@9 47 if (err != Z_OK) return err;
alpar@9 48
alpar@9 49 err = deflate(&stream, Z_FINISH);
alpar@9 50 if (err != Z_STREAM_END) {
alpar@9 51 deflateEnd(&stream);
alpar@9 52 return err == Z_OK ? Z_BUF_ERROR : err;
alpar@9 53 }
alpar@9 54 *destLen = stream.total_out;
alpar@9 55
alpar@9 56 err = deflateEnd(&stream);
alpar@9 57 return err;
alpar@9 58 }
alpar@9 59
alpar@9 60 /* ===========================================================================
alpar@9 61 */
alpar@9 62 int ZEXPORT compress (dest, destLen, source, sourceLen)
alpar@9 63 Bytef *dest;
alpar@9 64 uLongf *destLen;
alpar@9 65 const Bytef *source;
alpar@9 66 uLong sourceLen;
alpar@9 67 {
alpar@9 68 return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
alpar@9 69 }
alpar@9 70
alpar@9 71 /* ===========================================================================
alpar@9 72 If the default memLevel or windowBits for deflateInit() is changed, then
alpar@9 73 this function needs to be updated.
alpar@9 74 */
alpar@9 75 uLong ZEXPORT compressBound (sourceLen)
alpar@9 76 uLong sourceLen;
alpar@9 77 {
alpar@9 78 return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
alpar@9 79 (sourceLen >> 25) + 13;
alpar@9 80 }