5128eecc9f 2011-02-23        kinaba: /* compress.c -- compress a memory buffer
5128eecc9f 2011-02-23        kinaba:  * Copyright (C) 1995-1998 Jean-loup Gailly.
5128eecc9f 2011-02-23        kinaba:  * For conditions of distribution and use, see copyright notice in zlib.h
5128eecc9f 2011-02-23        kinaba:  */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* @(#) $Id$ */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: #include "zlib.h"
5128eecc9f 2011-02-23        kinaba: #ifndef KI_GZ_NO_COMPRESSION
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Compresses the source buffer into the destination buffer. The level
5128eecc9f 2011-02-23        kinaba:    parameter has the same meaning as in deflateInit.  sourceLen is the byte
5128eecc9f 2011-02-23        kinaba:    length of the source buffer. Upon entry, destLen is the total size of the
5128eecc9f 2011-02-23        kinaba:    destination buffer, which must be at least 0.1% larger than sourceLen plus
5128eecc9f 2011-02-23        kinaba:    12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:      compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
5128eecc9f 2011-02-23        kinaba:    memory, Z_BUF_ERROR if there was not enough room in the output buffer,
5128eecc9f 2011-02-23        kinaba:    Z_STREAM_ERROR if the level parameter is invalid.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
5128eecc9f 2011-02-23        kinaba:     Bytef *dest;
5128eecc9f 2011-02-23        kinaba:     uLongf *destLen;
5128eecc9f 2011-02-23        kinaba:     const Bytef *source;
5128eecc9f 2011-02-23        kinaba:     uLong sourceLen;
5128eecc9f 2011-02-23        kinaba:     int level;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     z_stream stream;
5128eecc9f 2011-02-23        kinaba:     int err;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     stream.next_in = (Bytef*)source;
5128eecc9f 2011-02-23        kinaba:     stream.avail_in = (uInt)sourceLen;
5128eecc9f 2011-02-23        kinaba: #ifdef MAXSEG_64K
5128eecc9f 2011-02-23        kinaba:     /* Check for source > 64K on 16-bit machine: */
5128eecc9f 2011-02-23        kinaba:     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
5128eecc9f 2011-02-23        kinaba: #endif
5128eecc9f 2011-02-23        kinaba:     stream.next_out = dest;
5128eecc9f 2011-02-23        kinaba:     stream.avail_out = (uInt)*destLen;
5128eecc9f 2011-02-23        kinaba:     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     stream.zalloc = (alloc_func)0;
5128eecc9f 2011-02-23        kinaba:     stream.zfree = (free_func)0;
5128eecc9f 2011-02-23        kinaba:     stream.opaque = (voidpf)0;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     err = deflateInit(&stream, level);
5128eecc9f 2011-02-23        kinaba:     if (err != Z_OK) return err;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     err = deflate(&stream, Z_FINISH);
5128eecc9f 2011-02-23        kinaba:     if (err != Z_STREAM_END) {
5128eecc9f 2011-02-23        kinaba:         deflateEnd(&stream);
5128eecc9f 2011-02-23        kinaba:         return err == Z_OK ? Z_BUF_ERROR : err;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     *destLen = stream.total_out;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     err = deflateEnd(&stream);
5128eecc9f 2011-02-23        kinaba:     return err;
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:  */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT compress (dest, destLen, source, sourceLen)
5128eecc9f 2011-02-23        kinaba:     Bytef *dest;
5128eecc9f 2011-02-23        kinaba:     uLongf *destLen;
5128eecc9f 2011-02-23        kinaba:     const Bytef *source;
5128eecc9f 2011-02-23        kinaba:     uLong sourceLen;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
5128eecc9f 2011-02-23        kinaba: }
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: #endif /* KI_GZ_NO_COMPRESSION */