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///=============================================================================
//
// file : jpeg_bitstream.h
//
// description : Simple jpeg coding/decoding library
// Bitstream management and huffman coding
//
// project : TANGO
//
// author(s) : JL Pons
//
// Copyright (C) : 2004,2005,2006,2007,2008,2009,2010,2011,2012,2013
// European Synchrotron Radiation Facility
// BP 220, Grenoble 38043
// FRANCE
//
// This file is part of Tango.
//
// Tango 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 3 of the License, or
// (at your option) any later version.
//
// Tango 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 Tango. If not, see <http://www.gnu.org/licenses/>.
//
// $Revision: 22213 $
//
// $Log$
// Revision 1.3 2009/04/20 14:55:58 jlpons
// Added GPL header, changed memory allocation to C++ fashion.
//
//=============================================================================
#ifndef _JPEGBITSTREAMH_
#define _JPEGBITSTREAMH_
#include "jpeg_lib.h"
#include "jpeg_const.h"
#define BUFFER_SIZE 524288
// ------------------------------------------------------------
class OutputBitStream {
public:
OutputBitStream();
~OutputBitStream();
void align();
void flush();
void init();
unsigned char *get_data();
unsigned long get_size();
void put_bits(int code,int _size);
void put_byte(unsigned char code);
void put_byteI(unsigned char code);
void put_short(unsigned short code);
void encode_block(short *block,HUFFMANTABLE *hDC,HUFFMANTABLE *hAC,short *lastDc);
private:
void more_byte();
void load_mm();
unsigned char *buffer;
int nbByte;
int buffSize;
int nbBits;
#ifdef _WINDOWS
unsigned long bits;
#else
unsigned int bits;
#endif
unsigned char *bufferPtr;
unsigned char *numbits;
unsigned char bScratch[4];
};
// ------------------------------------------------------------
class InputBitStream {
public:
InputBitStream(unsigned char *buff,int buffSize);
~InputBitStream();
void align();
void flush();
void init();
int get_byte();
int backward(int l);
int get_bits(int numbits);
int decode_mcu(JPGDECODER *decoder);
private:
unsigned char *_buffer;
int _buffSize;
int _byteRead;
int _nbBits;
#ifdef _WINDOWS
unsigned long _bits;
#else
unsigned int _bits;
#endif
unsigned char *_bufferPtr;
};
#endif /* _JPEGBITSTREAMH_ */
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