| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | // $Id: G4RTOutBitStream.cc,v 1.6 2008/04/04 13:52:48 allison Exp $
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| 28 | // GEANT4 tag $Name: $
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| 29 | //
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| 30 | //
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| 31 | //
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| 32 |
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| 33 | #include <string.h>
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| 34 | #include "G4RTJpeg.hh"
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| 35 | #include "G4RTOutBitStream.hh"
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| 36 |
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| 37 |
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| 38 |
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| 39 | G4OutBitStream::G4OutBitStream(int size)
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| 40 | {
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| 41 | if(size < 1)
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| 42 | throw( G4MemoryError( size, "G4OutBitStream" ) );
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| 43 |
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| 44 | mHeadOfBuf = mBuf = new u_char[size];
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| 45 | if( mHeadOfBuf == 0 )
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| 46 | throw( G4MemoryError( size, "G4OutBitStream" ) );
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| 47 |
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| 48 | mEndOfBuf = mBuf + size;
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| 49 |
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| 50 | memset( mHeadOfBuf, 0, size );
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| 51 |
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| 52 | mBitPos = 7;
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| 53 | mWriteFlag = 1;
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| 54 | }
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| 55 |
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| 56 | void
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| 57 | G4OutBitStream::IncBuf( void )
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| 58 | {
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| 59 | if( ++mBuf >= mEndOfBuf )
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| 60 | mWriteFlag = 0;
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| 61 | }
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| 62 |
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| 63 |
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| 64 |
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| 65 | void
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| 66 | G4OutBitStream::SetBits(int v, int numBits)
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| 67 | {
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| 68 | if( numBits == 0 )
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| 69 | return;
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| 70 | if( numBits > 16 )
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| 71 | throw( G4BufferError( "SetBits:Max Bit Over" ) );
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| 72 | if( numBits > 8 ){
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| 73 | Set8Bits( u_char(v>>8), numBits-8 );
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| 74 | numBits = 8;
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| 75 | }
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| 76 | Set8Bits( u_char(v), numBits );
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| 77 | }
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| 78 |
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| 79 | void
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| 80 | G4OutBitStream::SetFewBits(u_char v, int numBits)
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| 81 | {
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| 82 | v &= BitFullMaskT[numBits-1];
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| 83 | *mBuf |= v << (mBitPos + 1 - numBits);
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| 84 | if( (mBitPos -= numBits) < 0 ){
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| 85 | if( *mBuf == 0xff ){
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| 86 | IncBuf();
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| 87 | *mBuf = 0;
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| 88 | }
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| 89 | IncBuf();
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| 90 | mBitPos = 7;
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| 91 | }
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| 92 | }
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| 93 |
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| 94 | void
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| 95 | G4OutBitStream::SetBits2Byte(u_char v, int numBits)
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| 96 | {
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| 97 | v &= BitFullMaskT[numBits-1];
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| 98 | int nextBits = numBits - (mBitPos + 1);
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| 99 | *mBuf |= ( v >> nextBits ) & BitFullMaskT[mBitPos];
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| 100 | if( *mBuf == 0xff ){
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| 101 | IncBuf();
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| 102 | *mBuf = 0;
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| 103 | }
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| 104 | IncBuf();
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| 105 |
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| 106 | *mBuf = v << (8 - nextBits);
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| 107 | mBitPos = 7 - nextBits;
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| 108 | }
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| 109 |
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| 110 | void
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| 111 | G4OutBitStream::Set8Bits(u_char v, int numBits)
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| 112 | {
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| 113 | if( mBitPos + 1 >= numBits )
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| 114 | SetFewBits( (u_char)v, numBits );
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| 115 | else
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| 116 | SetBits2Byte( (u_char)v, numBits );
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| 117 | }
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| 118 |
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| 119 |
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| 120 | void
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| 121 | G4OutBitStream::FullBit( void )
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| 122 | {
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| 123 | if( mBitPos != 7 )
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| 124 | SetFewBits( BitFullMaskT[mBitPos], mBitPos+1 );
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| 125 | }
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| 126 |
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| 127 | void
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| 128 | G4OutBitStream::SetByte(u_char dat)
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| 129 | {
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| 130 | if( mWriteFlag ){
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| 131 | FullBit();
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| 132 | *mBuf = dat;
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| 133 | IncBuf();
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| 134 | return;
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| 135 | }
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| 136 | throw( G4BufferError( "SetByte" ) );
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| 137 | }
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| 138 |
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| 139 | void
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| 140 | G4OutBitStream::SetWord(u_int dat)
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| 141 | {
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| 142 | if( mWriteFlag ){
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| 143 | FullBit();
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| 144 | *mBuf = (dat >> 8) & 0xff;
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| 145 | IncBuf();
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| 146 | *mBuf = dat & 0xff;
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| 147 | IncBuf();
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| 148 | return;
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| 149 | }
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| 150 | throw( G4BufferError( "SetWord" ) );
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| 151 | }
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| 152 |
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| 153 | void
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| 154 | G4OutBitStream::CopyByte(const char* src, int n)
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| 155 | {
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| 156 | if( mBuf+n < mEndOfBuf ){
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| 157 | FullBit();
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| 158 | memcpy( mBuf, src, n );
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| 159 | mBuf += n;
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| 160 | return;
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| 161 | }
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| 162 | throw( G4BufferError( "CopyByte" ) );
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| 163 | }
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| 164 |
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