2 ===========================================================================
5 Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.
7 This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).
9 Doom 3 Source Code is free software: you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation, either version 3 of the License, or
12 (at your option) any later version.
14 Doom 3 Source Code is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with Doom 3 Source Code. If not, see <http://www.gnu.org/licenses/>.
22 In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code. If not, please request a copy in writing from id Software at the address below.
24 If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
26 ===========================================================================
29 #ifndef __COMPRESSOR_H__
30 #define __COMPRESSOR_H__
33 ===============================================================================
35 idCompressor is a layer ontop of idFile which provides lossless data
36 compression. The compressor can be used as a regular file and multiple
37 compressors can be stacked ontop of each other.
39 ===============================================================================
42 class idCompressor : public idFile {
44 // compressor allocation
45 static idCompressor * AllocNoCompression( void );
46 static idCompressor * AllocBitStream( void );
47 static idCompressor * AllocRunLength( void );
48 static idCompressor * AllocRunLength_ZeroBased( void );
49 static idCompressor * AllocHuffman( void );
50 static idCompressor * AllocArithmetic( void );
51 static idCompressor * AllocLZSS( void );
52 static idCompressor * AllocLZSS_WordAligned( void );
53 static idCompressor * AllocLZW( void );
56 virtual void Init( idFile *f, bool compress, int wordLength ) = 0;
57 virtual void FinishCompress( void ) = 0;
58 virtual float GetCompressionRatio( void ) const = 0;
60 // common idFile interface
61 virtual const char * GetName( void ) = 0;
62 virtual const char * GetFullPath( void ) = 0;
63 virtual int Read( void *outData, int outLength ) = 0;
64 virtual int Write( const void *inData, int inLength ) = 0;
65 virtual int Length( void ) = 0;
66 virtual ID_TIME_T Timestamp( void ) = 0;
67 virtual int Tell( void ) = 0;
68 virtual void ForceFlush( void ) = 0;
69 virtual void Flush( void ) = 0;
70 virtual int Seek( long offset, fsOrigin_t origin ) = 0;
73 #endif /* !__COMPRESSOR_H__ */