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winix/winixd/core/compress.h

103 lines
2.9 KiB

/*
* This file is a part of Winix
* and is distributed under the 2-Clause BSD licence.
* Author: Tomasz Sowa <t.sowa@ttmath.org>
*/
/*
* Copyright (c) 2008-2014, Tomasz Sowa
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef headerfile_winix_core_compress
#define headerfile_winix_core_compress
#include <cstring>
#include <zlib.h>
#include "requesttypes.h"
#include "winixbase.h"
namespace Winix
{
class Compress : public WinixBase
{
public:
Compress();
~Compress();
int Init(int compress_level_ = 6);
/*
encoding:
0 - raw deflate data with no zlib header or trailer, and will not compute an adler32 check value
(for Internet Explorer)
1 - deflate
2 - gzip
*/
int Compressing(const char * source, size_t source_len, BinaryPage & out_stream, int encoding = 2);
int Compressing(const BinaryPage & in, BinaryPage & out, int encoding = 2);
private:
bool AllocateMemory();
bool InitRawDeflate();
bool InitDeflate();
bool InitGzip();
int MakeCompress(z_stream & strm, const char * source, size_t source_len, BinaryPage & out_stream, int encoding);
int MakeCompress(z_stream & strm, const BinaryPage & page, BinaryPage & out, int encoding);
z_stream * SelectStream(int encoding);
void ResetStream(z_stream * pstrm, int encoding);
void PutLog(size_t source_len, int encoding);
void CopyToInputBuffer(BinaryPage::const_iterator & i, size_t len);
int compress_level;
size_t buffer_max_len;
// size of the last compressed page
size_t last_out_size;
char * buffer_in;
char * buffer_out;
z_stream strm_raw_deflate, strm_deflate, strm_gzip;
bool raw_deflate_inited, deflate_inited, gzip_inited;
bool ready_for_compress;
};
} // namespace Winix
#endif