opencv/modules/imgcodecs/src/bitstrm.hpp
2017-08-16 18:56:41 +03:00

190 lines
5.6 KiB
C++

/*M///////////////////////////////////////////////////////////////////////////////////////
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// License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistribution's of source code must retain the above copyright notice,
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#ifndef _BITSTRM_H_
#define _BITSTRM_H_
#include <stdio.h>
namespace cv
{
#define DECLARE_RBS_EXCEPTION(name) \
class RBS_ ## name ## _Exception : public cv::Exception \
{ \
public: \
RBS_ ## name ## _Exception(int code_, const String& err_, const String& func_, const String& file_, int line_) : \
cv::Exception(code_, err_, func_, file_, line_) \
{} \
};
DECLARE_RBS_EXCEPTION(THROW_EOS)
#define RBS_THROW_EOS RBS_THROW_EOS_Exception(cv::Error::StsError, "Unexpected end of input stream", CV_Func, __FILE__, __LINE__)
DECLARE_RBS_EXCEPTION(THROW_FORB)
#define RBS_THROW_FORB RBS_THROW_FORB_Exception(cv::Error::StsError, "Forrbidden huffman code", CV_Func, __FILE__, __LINE__)
DECLARE_RBS_EXCEPTION(BAD_HEADER)
#define RBS_BAD_HEADER RBS_BAD_HEADER_Exception(cv::Error::StsError, "Invalid header", CV_Func, __FILE__, __LINE__)
typedef unsigned long ulong;
// class RBaseStream - base class for other reading streams.
class RBaseStream
{
public:
//methods
RBaseStream();
virtual ~RBaseStream();
virtual bool open( const String& filename );
virtual bool open( const Mat& buf );
virtual void close();
bool isOpened();
void setPos( int pos );
int getPos();
void skip( int bytes );
protected:
bool m_allocated;
uchar* m_start;
uchar* m_end;
uchar* m_current;
FILE* m_file;
int m_block_size;
int m_block_pos;
bool m_is_opened;
virtual void readBlock();
virtual void release();
virtual void allocate();
};
// class RLByteStream - uchar-oriented stream.
// l in prefix means that the least significant uchar of a multi-uchar value goes first
class RLByteStream : public RBaseStream
{
public:
virtual ~RLByteStream();
int getByte();
int getBytes( void* buffer, int count );
int getWord();
int getDWord();
};
// class RMBitStream - uchar-oriented stream.
// m in prefix means that the most significant uchar of a multi-uchar value go first
class RMByteStream : public RLByteStream
{
public:
virtual ~RMByteStream();
int getWord();
int getDWord();
};
// WBaseStream - base class for output streams
class WBaseStream
{
public:
//methods
WBaseStream();
virtual ~WBaseStream();
virtual bool open( const String& filename );
virtual bool open( std::vector<uchar>& buf );
virtual void close();
bool isOpened();
int getPos();
protected:
uchar* m_start;
uchar* m_end;
uchar* m_current;
int m_block_size;
int m_block_pos;
FILE* m_file;
bool m_is_opened;
std::vector<uchar>* m_buf;
virtual void writeBlock();
virtual void release();
virtual void allocate();
};
// class WLByteStream - uchar-oriented stream.
// l in prefix means that the least significant uchar of a multi-byte value goes first
class WLByteStream : public WBaseStream
{
public:
virtual ~WLByteStream();
void putByte( int val );
void putBytes( const void* buffer, int count );
void putWord( int val );
void putDWord( int val );
};
// class WLByteStream - uchar-oriented stream.
// m in prefix means that the least significant uchar of a multi-byte value goes last
class WMByteStream : public WLByteStream
{
public:
virtual ~WMByteStream();
void putWord( int val );
void putDWord( int val );
};
inline unsigned BSWAP(unsigned v)
{
return (v<<24)|((v&0xff00)<<8)|((v>>8)&0xff00)|((unsigned)v>>24);
}
bool bsIsBigEndian( void );
}
#endif/*_BITSTRM_H_*/