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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_DECOMPRESSOR_H
#define SCI_DECOMPRESSOR_H
#include "common/scummsys.h"
namespace Common { class ReadStream; }
namespace Sci {
enum ResourceCompression {
kCompUnknown = -1,
kCompNone = 0,
kCompLZW,
kCompHuffman,
kCompLZW1, // LZW-like compression used in SCI01 and SCI1
kCompLZW1View, // Comp3 + view Post-processing
kCompLZW1Pic, // Comp3 + pic Post-processing
#ifdef ENABLE_SCI32
kCompSTACpack, // ? Used in SCI32
#endif
kCompDCL
};
/**
* Base class for decompressors.
* Simply copies nPacked bytes from src to dest.
*/
class Decompressor {
public:
Decompressor() {}
virtual ~Decompressor() {}
virtual int unpack(Common::ReadStream *src, byte *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 0 on success, non-zero on error
*/
virtual void init(Common::ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked);
/**
* Get a number of bits from _src stream, starting with the most
* significant unread bit of the current four byte block.
* @param n number of bits to get
* @return n-bits number
*/
uint32 getBitsMSB(int n);
/**
* Get a number of bits from _src stream, starting with the least
* significant unread bit of the current four byte block.
* @param n number of bits to get
* @return n-bits number
*/
uint32 getBitsLSB(int n);
/**
* Get one byte from _src stream.
* @return byte
*/
byte getByteMSB();
byte getByteLSB();
void fetchBitsMSB();
void fetchBitsLSB();
/**
* Write one byte into _dest stream
* @param b byte to put
*/
virtual void putByte(byte b);
/**
* Returns true if all expected data has been unpacked to _dest
* and there is no more data in _src.
*/
bool isFinished() {
return (_dwWrote == _szUnpacked) && (_dwRead >= _szPacked);
}
uint32 _dwBits; ///< bits buffer
byte _nBits; ///< number of unread bits in _dwBits
uint32 _szPacked; ///< size of the compressed data
uint32 _szUnpacked; ///< size of the decompressed data
uint32 _dwRead; ///< number of bytes read from _src
uint32 _dwWrote; ///< number of bytes written to _dest
Common::ReadStream *_src;
byte *_dest;
};
/**
* Huffman decompressor
*/
class DecompressorHuffman : public Decompressor {
public:
int unpack(Common::ReadStream *src, byte *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 DecompressorLZW : public Decompressor {
public:
DecompressorLZW(int nCompression) {
_compression = nCompression;
}
void init(Common::ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked);
int unpack(Common::ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked);
protected:
enum {
PIC_OPX_EMBEDDED_VIEW = 1,
PIC_OPX_SET_PALETTE = 2,
PIC_OP_OPX = 0xfe
};
// unpacking procedures
// TODO: unpackLZW and unpackLZW1 are similar and should be merged
int unpackLZW1(Common::ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked);
int unpackLZW(Common::ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked);
// functions to post-process view and pic resources
void reorderPic(byte *src, byte *dest, int dsize);
void reorderView(byte *src, byte *dest);
void decodeRLE(byte **rledata, byte **pixeldata, byte *outbuffer, int size);
int getRLEsize(byte *rledata, int dsize);
void buildCelHeaders(byte **seeker, byte **writer, int celindex, int *cc_lengths, int max);
// decompressor data
struct Tokenlist {
byte data;
uint16 next;
};
uint16 _numbits;
uint16 _curtoken, _endtoken;
int _compression;
};
/**
* DCL decompressor for SCI1.1
*/
class DecompressorDCL : public Decompressor {
public:
int unpack(Common::ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked);
};
#ifdef ENABLE_SCI32
/**
* STACpack decompressor for SCI32
*/
class DecompressorLZS : public Decompressor {
public:
int unpack(Common::ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked);
protected:
int unpackLZS();
uint32 getCompLen();
void copyComp(int offs, uint32 clen);
};
#endif
} // End of namespace Sci
#endif // SCI_SCICORE_DECOMPRESSOR_H
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