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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 M4_COMPRESSION_H
#define M4_COMPRESSION_H
#include "common/scummsys.h"
#include "common/stream.h"
#include "common/endian.h"
#include "m4/m4.h"
namespace M4 {
struct MadsPackEntry {
public:
uint16 hash;
uint32 size;
uint32 compressedSize;
byte *data;
};
class MadsPack {
private:
MadsPackEntry *_items;
int _count;
int _dataOffset;
void initialise(Common::SeekableReadStream *stream);
public:
static bool isCompressed(Common::SeekableReadStream *stream);
MadsPack(Common::SeekableReadStream *stream);
MadsPack(const char *resourceName, MadsM4Engine *vm);
~MadsPack();
int getCount() const { return _count; }
MadsPackEntry &getItem(int index) const { return _items[index]; }
MadsPackEntry &operator[](int index) const { return _items[index]; }
Common::MemoryReadStream *getItemStream(int index) {
return new Common::MemoryReadStream(_items[index].data, _items[index].size, DisposeAfterUse::NO);
}
int getDataOffset() const { return _dataOffset; }
};
class FabDecompressor {
private:
int _bitsLeft;
uint32 _bitBuffer;
const byte *_srcData, *_srcP;
int _srcSize;
int getBit();
public:
void decompress(const byte *srcData, int srcSize, byte *destData, int destSize);
};
} // End of namespace M4
#endif
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