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decode.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2005-2006 The ScummVM project
 *
 * 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: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/engines/lure/decode.h $
 * $Id: decode.h 20578 2006-02-11 19:25:13Z fingolfin $
 *
 */

#ifndef __lure_decode_h__
#define __lure_decode_h__

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

namespace Lure {

class PictureDecoder {
private:
      byte *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();
      void swap(uint16 &v1, uint16 &v2);
public:
      MemoryBlock *decode(MemoryBlock *src, uint32 maxOutputSize = SCREEN_SIZE);
};

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(byte *&pSrc, uint16 &currData, uint16 &bitCtr, 
                                 uint16 &dx, bool &carry);
};

} // End of namespace Lure

#endif

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