/*****************************************************************************
                    The Dark Mod GPL Source Code
 
 This file is part of the The Dark Mod Source Code, originally based 
 on the Doom 3 GPL Source Code as published in 2011.
 
 The Dark Mod Source Code is free software: you can redistribute it 
 and/or modify it under the terms of the GNU General Public License as 
 published by the Free Software Foundation, either version 3 of the License, 
 or (at your option) any later version. For details, see LICENSE.TXT.
 
 Project: The Dark Mod (http://www.thedarkmod.com/)
 
******************************************************************************/

#ifndef __COMPRESSOR_H__
#define __COMPRESSOR_H__

/*
===============================================================================

	idCompressor is a layer ontop of idFile which provides lossless data
	compression. The compressor can be used as a regular file and multiple
	compressors can be stacked ontop of each other.

===============================================================================
*/

class idCompressor : public idFile {
public:
							// compressor allocation
	static idCompressor *	AllocNoCompression( void );
	static idCompressor *	AllocBitStream( void );
	static idCompressor *	AllocRunLength( void );
	static idCompressor *	AllocRunLength_ZeroBased( void );
	static idCompressor *	AllocHuffman( void );
	static idCompressor *	AllocArithmetic( void );
	static idCompressor *	AllocLZSS( void );
	static idCompressor *	AllocLZSS_WordAligned( void );
	static idCompressor *	AllocLZW( void );

							// initialization
	virtual void			Init( idFile *f, bool compress, int wordLength ) = 0;
	virtual void			FinishCompress( void ) = 0;
	virtual float			GetCompressionRatio( void ) const = 0;

							// common idFile interface
	virtual const char *	GetName( void ) = 0;
	virtual const char *	GetFullPath( void ) = 0;
	virtual int				Read( void *outData, int outLength ) = 0;
	virtual int				Write( const void *inData, int inLength ) = 0;
	virtual int				Length( void ) = 0;
	virtual ID_TIME_T			Timestamp( void ) = 0;
	virtual int				Tell( void ) = 0;
	virtual void			ForceFlush( void ) = 0;
	virtual void			Flush( void ) = 0;
	virtual int				Seek( long offset, fsOrigin_t origin ) = 0;
};

#endif /* !__COMPRESSOR_H__ */
