/* 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.
 *
 */

#ifndef TOON_TOOLS_H
#define TOON_TOOLS_H

#include "common/scummsys.h"
#include "common/endian.h"

#define RNC1_SIGNATURE   0x524E4301 // "RNC\001"
#define RNC2_SIGNATURE   0x524E4302 // "RNC\002"

namespace Toon {

const uint32 kCompLZSS = 0x4C5A5353;
const uint32 kCompSPCN = 0x5350434E;
const uint32 kCompRNC1 = 0x524E4301;
const uint32 kCompRNC2 = 0x524E4302;

#define READ_LE_INT16(x) (int16) READ_LE_UINT16(x)
#define READ_LE_INT32(x) (int32) READ_LE_UINT32(x)

#define WRITE_LE_INT16(x, y)  WRITE_LE_UINT16(x, (int16)y)
#define WRITE_LE_INT32(x, y)  WRITE_LE_UINT32(x, (int32)y)

uint32 decompressSPCN(byte *src, byte *dst, uint32 dstsize);
uint32 decompressLZSS(byte *src, byte *dst, int dstsize);

class RncDecoder {

protected:
	uint16 _rawTable[64];
	uint16 _posTable[64];
	uint16 _lenTable[64];
	uint16 _crcTable[256];

	uint16 _bitBuffl;
	uint16 _bitBuffh;
	uint8 _bitCount;

	const uint8 *_srcPtr;
	uint8 *_dstPtr;

	int16 _inputByteLeft;

public:
	RncDecoder();
	~RncDecoder();
	int32 unpackM1(const void *input, uint16 inputSize, void *output);
	int32 unpackM2(const void *input, void *output);

protected:
	void initCrc();
	uint16 crcBlock(const uint8 *block, uint32 size);
	uint16 inputBits(uint8 amount);
	void makeHufftable(uint16 *table);
	uint16 inputValue(uint16 *table);
	int getbit();
};

} // End of namespace Toon

#endif
