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 1.5 2006/06/29 21:24:01 gunter 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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