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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifndef SCI_SCICORE_DECOMPRESSOR_H
#define SCI_SCICORE_DECOMPRESSOR_H
#include "common/file.h"
namespace Sci {
enum ResourceCompression {
kCompUnknown = -1,
kCompNone = 0,
kCompLZW,
kCompHuffman,
kComp3, // LZW-like compression used in SCI01 and SCI1
kComp3View, // Comp3 + view Post-processing
kComp3Pic, // Comp3 + pic Post-processing
kCompDCL,
kCompSTACpack // ? Used in SCI32
};
//----------------------------------------------
// Base class for decompressors
// Simply copies nPacked bytes from src to dest
//----------------------------------------------
class Decompressor {
public:
Decompressor() {}
virtual ~Decompressor() {}
//! get a number of bits from _src stream
/** @param n - number of bits to get
@return (uint32) n-bits number
*/
virtual int unpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
uint32 nUnpacked);
protected:
//! Initialize decompressor
/** @param src - source stream to read from
@param dest - destination stream to write to
@param nPacked - size of packed data
@param nUnpacket - size of unpacked data
@return (int) 0 on success, non-zero on error
*/
virtual void init(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
uint32 nUnpacked); //! get one bit from _src stream
/** @return (bool) bit;
*/
virtual bool getBit();
//! get a number of bits from _src stream
/** @param n - number of bits to get
@return (uint32) n-bits number
*/
virtual uint32 getBits(int n);
//! put byte to _dest stream
/** @param b - byte to put
*/
virtual void putByte(byte b);
virtual void fetchBits();
int copyBytes(Common::ReadStream *src, Common::WriteStream *dest, uint32 nSize);
uint32 _dwBits;
byte _nBits;
uint32 _szPacked;
uint32 _szUnpacked;
uint32 _dwRead;
uint32 _dwWrote;
Common::ReadStream *_src;
Common::WriteStream *_dest;
};
//----------------------------------------------
// Huffman decompressor
//----------------------------------------------
class DecompressorHuffman : public Decompressor {
public:
int unpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
uint32 nUnpacked);
protected:
int16 getc2();
byte *_nodes;
};
//----------------------------------------------
// LZW-like decompressor for SCI01/SCI1
// TODO: Needs clean-up of post-processing fncs
//----------------------------------------------
class DecompressorComp3 : public Decompressor {
public:
DecompressorComp3(int nCompression) {
_compression = nCompression;
}
void init(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked, uint32 nUnpacked);
int unpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
uint32 nUnpacked);
protected:
enum {
PIC_OPX_EMBEDDED_VIEW = 1,
PIC_OPX_SET_PALETTE = 2,
PIC_OP_OPX = 0xfe
};
// actual unpacking procedure
int doUnpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
uint32 nUnpacked);
// functions to post-process view and pic resources
void decodeRLE(Common::ReadStream *src, Common::WriteStream *dest, byte *pixeldata, uint16 size);
void reorderPic(Common::ReadStream *src, Common::WriteStream *dest, int dsize);
//
void decode_rle(byte **rledata, byte **pixeldata, byte *outbuffer, int size);
int rle_size(byte *rledata, int dsize);
void build_cel_headers(byte **seeker, byte **writer, int celindex, int *cc_lengths, int max);
void view_reorder(byte *inbuffer, byte *outbuffer);
// decompressor data
struct tokenlist {
byte data;
uint16 next;
} _tokens[0x1004];
byte _stak[0x1014];
byte _lastchar;
uint16 _stakptr;
uint16 _numbits, _lastbits;
uint16 _curtoken, _endtoken;
int _compression;
};
//----------------------------------------------
// LZW 9-12 bits decompressor for SCI0
// TODO : Needs clean-up of doUnpack()
//----------------------------------------------
class DecompressorLZW : public Decompressor {
public:
// void init(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked, uint32 nUnpacked);
int unpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
uint32 nUnpacked);
protected:
int doUnpack(byte *src, byte *dest, int length, int complength);
};
//----------------------------------------------
// DCL decompressor for SCI1.1
// TODO : Needs clean-up of doUnpack()
//----------------------------------------------
class DecompressorDCL : public Decompressor {
public:
// void init(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked, uint32 nUnpacked);
int unpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
uint32 nUnpacked);
protected:
int unpackDCL(byte *src, byte *dest, int length, int complength);
int getbits(struct bit_read_struct *inp, int bits);
int huffman_lookup(struct bit_read_struct *inp, int *tree);
};
} // End of namespace Sci
#endif // SCI_SCICORE_DECOMPRESSOR_H
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