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/*
* /home/ms/files/source/libsidtune/RCS/PP20.h,v
*
* PowerPacker (AMIGA) "PP20" format decompressor.
* Copyright (C) Michael Schwendt <mschwendt@yahoo.com>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef PP_DECOMPRESSOR_H
#define PP_DECOMPRESSOR_H
#include "PP20_Defs.h"
class PP20
{
public:
PP20();
bool isCompressed(const void* source, const udword_ppt size);
// If successful, allocates a new buffer containing the
// uncompresse data and returns the uncompressed length.
// Else, returns 0.
udword_ppt decompress(const void* source,
udword_ppt size,
ubyte_ppt** destRef);
const char* getStatusString() { return statusString; }
private:
bool checkEfficiency(const void* source);
void bytesTOdword();
udword_ppt readBits(int count);
void bytes();
void sequence();
static const char* PP_ID;
ubyte_ppt efficiency[4];
const ubyte_ppt* sourceBeg;
const ubyte_ppt* readPtr;
const ubyte_ppt* destBeg;
ubyte_ppt* writePtr;
udword_ppt current; // compressed data longword
int bits; // number of bits in 'current' to evaluate
bool globalError; // exception-free version of code
const char* statusString;
};
#endif /* PP_DECOMPRESSOR_H */
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