bitstrm.hpp 5.11 KB
Newer Older
wester committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182
/*M///////////////////////////////////////////////////////////////////////////////////////
//
//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
//  By downloading, copying, installing or using the software you agree to this license.
//  If you do not agree to this license, do not download, install,
//  copy or use the software.
//
//
//                           License Agreement
//                For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
// 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,
//     this list of conditions and the following disclaimer.
//
//   * Redistribution's in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//
//   * The name of the copyright holders may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/

#ifndef _BITSTRM_H_
#define _BITSTRM_H_

#include <stdio.h>

namespace cv
{

enum
{
    RBS_THROW_EOS=-123,  // <end of stream> exception code
    RBS_THROW_FORB=-124,  // <forrbidden huffman code> exception code
    RBS_HUFF_FORB=2047,  // forrbidden huffman code "value"
    RBS_BAD_HEADER=-125 // invalid header
};

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_*/