+++ /dev/null
-/* compress.c -- compress a memory buffer\r
- * Copyright (C) 1995-2005 Jean-loup Gailly.\r
- * For conditions of distribution and use, see copyright notice in zlib.h\r
- */\r
-\r
-/* @(#) $Id$ */\r
-\r
-#define ZLIB_INTERNAL\r
-#include "zlib.h"\r
-\r
-/* ===========================================================================\r
- Compresses the source buffer into the destination buffer. The level\r
- parameter has the same meaning as in deflateInit. sourceLen is the byte\r
- length of the source buffer. Upon entry, destLen is the total size of the\r
- destination buffer, which must be at least 0.1% larger than sourceLen plus\r
- 12 bytes. Upon exit, destLen is the actual size of the compressed buffer.\r
-\r
- compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough\r
- memory, Z_BUF_ERROR if there was not enough room in the output buffer,\r
- Z_STREAM_ERROR if the level parameter is invalid.\r
-*/\r
-int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)\r
- Bytef *dest;\r
- uLongf *destLen;\r
- const Bytef *source;\r
- uLong sourceLen;\r
- int level;\r
-{\r
- z_stream stream;\r
- int err;\r
-\r
- stream.next_in = (z_const Bytef *)source;\r
- stream.avail_in = (uInt)sourceLen;\r
-#ifdef MAXSEG_64K\r
- /* Check for source > 64K on 16-bit machine: */\r
- if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;\r
-#endif\r
- stream.next_out = dest;\r
- stream.avail_out = (uInt)*destLen;\r
- if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;\r
-\r
- stream.zalloc = (alloc_func)0;\r
- stream.zfree = (free_func)0;\r
- stream.opaque = (voidpf)0;\r
-\r
- err = deflateInit(&stream, level);\r
- if (err != Z_OK) return err;\r
-\r
- err = deflate(&stream, Z_FINISH);\r
- if (err != Z_STREAM_END) {\r
- deflateEnd(&stream);\r
- return err == Z_OK ? Z_BUF_ERROR : err;\r
- }\r
- *destLen = stream.total_out;\r
-\r
- err = deflateEnd(&stream);\r
- return err;\r
-}\r
-\r
-/* ===========================================================================\r
- */\r
-int ZEXPORT compress (dest, destLen, source, sourceLen)\r
- Bytef *dest;\r
- uLongf *destLen;\r
- const Bytef *source;\r
- uLong sourceLen;\r
-{\r
- return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);\r
-}\r
-\r
-/* ===========================================================================\r
- If the default memLevel or windowBits for deflateInit() is changed, then\r
- this function needs to be updated.\r
- */\r
-uLong ZEXPORT compressBound (sourceLen)\r
- uLong sourceLen;\r
-{\r
- return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +\r
- (sourceLen >> 25) + 13;\r
-}\r