/*
 * Adplug - Replayer for many OPL2/OPL3 audio file formats.
 * Copyright (C) 1999 - 2007 Simon Peter, <dn.tlp@gmx.net>, et al.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * a2m.h - A2M Loader by Simon Peter <dn.tlp@gmx.net>
 */

#ifndef H_ADPLUG_A2MLOADER
#define H_ADPLUG_A2MLOADER

#include "protrack.h"

class Ca2mLoader: public CmodPlayer
{
public:
  static CPlayer *factory(Copl *newopl);

	Ca2mLoader(Copl *newopl)
		: CmodPlayer(newopl)
	{ };

	bool load(VFSFile *fd, const CFileProvider &fp);
	float getrefresh();

	std::string gettype()
	{ return std::string("AdLib Tracker 2"); };
	std::string gettitle()
	{ if(*songname) return std::string(songname,1,*songname); else return std::string(); };
	std::string getauthor()
	{ if(*author) return std::string(author,1,*author); else return std::string(); };
	unsigned int getinstruments()
	{ return 250; };
	std::string getinstrument(unsigned int n)
	{ return std::string(instname[n],1,*instname[n]); };

private:

#define ADPLUG_A2M_COPYRANGES		6
#define ADPLUG_A2M_FIRSTCODE		257
#define ADPLUG_A2M_MINCOPY			3
#define ADPLUG_A2M_MAXCOPY			255
#define ADPLUG_A2M_CODESPERRANGE	(ADPLUG_A2M_MAXCOPY - ADPLUG_A2M_MINCOPY + 1)
#define ADPLUG_A2M_MAXCHAR			(ADPLUG_A2M_FIRSTCODE + \
	ADPLUG_A2M_COPYRANGES * ADPLUG_A2M_CODESPERRANGE - 1)
#define ADPLUG_A2M_TWICEMAX			(2 * ADPLUG_A2M_MAXCHAR + 1)

	static const unsigned int MAXFREQ, MINCOPY, MAXCOPY, COPYRANGES,
		CODESPERRANGE, TERMINATE, FIRSTCODE, MAXCODE, SUCCMAX, TWICEMAX, ROOT,
		MAXBUF, MAXDISTANCE, MAXSIZE;

	static const unsigned short bitvalue[14];
	static const signed short copybits[ADPLUG_A2M_COPYRANGES],
		copymin[ADPLUG_A2M_COPYRANGES];

	void inittree();
	void updatefreq(unsigned short a,unsigned short b);
	void updatemodel(unsigned short code);
	unsigned short inputcode(unsigned short bits);
	unsigned short uncompress();
	void decode();
	unsigned short sixdepak(unsigned short *source,unsigned char *dest,unsigned short size);

	char songname[43], author[43], instname[250][33];

	unsigned short ibitcount, ibitbuffer, ibufcount, obufcount, input_size,
		output_size, leftc[ADPLUG_A2M_MAXCHAR+1], rghtc[ADPLUG_A2M_MAXCHAR+1],
		dad[ADPLUG_A2M_TWICEMAX+1], freq[ADPLUG_A2M_TWICEMAX+1], *wdbuf;
	unsigned char *obuf, *buf;
};
#endif

