decode.h

/* 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef LURE_DECODE_H
#define LURE_DECODE_H


#include "lure/luredefs.h"
#include "lure/memory.h"

namespace Lure {

class PictureDecoder {
private:
    MemoryBlock *dataIn;
    uint32 BP;
    uint32 dataPos, dataPos2;
    uint32 outputOffset;
    byte AL, AH;
    byte CH, CL;

    void writeByte(MemoryBlock *dest, byte v);
    void writeBytes(MemoryBlock *dest, byte v, uint16 numBytes);
    byte DSSI(bool incr = true);
    byte ESBX(bool incr = true);
    void decrCtr();
    bool shlCarry();

public:
    MemoryBlock *decode(MemoryBlock *src, uint32 maxOutputSize  = SCREEN_SIZE + 1);
    MemoryBlock *egaDecode(MemoryBlock *src, uint32 maxOutputSize);
    MemoryBlock *vgaDecode(MemoryBlock *src, uint32 maxOutputSize);
};

class AnimationDecoder {
public:
    static void rcl(uint16 &value, bool &carry);
    static uint32 decode_data(MemoryBlock *src, MemoryBlock *dest, uint32 srcPos);
    static void decode_data_2(MemoryBlock *src, byte *&pSrc, uint16 &currData,
                        uint16 &bitCtr, uint16 &dx, bool &carry);
};

} // End of namespace Lure

#endif