/*
 * This file is a part of Winix
 * and is not publicly distributed
 * 
 * Copyright (c) 2008-2012, Tomasz Sowa
 * All rights reserved.
 * 
 */
 
#ifndef headerfile_winix_core_compress
#define headerfile_winix_core_compress

#include <cstring>
#include <fcgiapp.h>
#include <zlib.h>
#include "requesttypes.h"



class Compress
{

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 CompressAndPut(const char * source, size_t source_len, FCGX_Stream * 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, FCGX_Stream * 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;

};


#endif