1 | /*************************************************************************
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2 | *
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3 | * bitio_random.c -- Functions for bitio to a file (random access)
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4 | * Copyright (C) 1994 Neil Sharman
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5 | *
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6 | * This program is free software; you can redistribute it and/or modify
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7 | * it under the terms of the GNU General Public License as published by
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8 | * the Free Software Foundation; either version 2 of the License, or
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9 | * (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | *
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20 | **************************************************************************/
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21 |
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22 | #include "sysfuncs.h"
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23 | #include "memlib.h"
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24 |
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25 | #include "longlong.h"
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26 |
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27 | #include "bitio_m_random.h"
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28 | #include "bitio_m.h"
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29 |
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30 |
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31 | void
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32 | BIO_Random_Start (FILE * f, unsigned long len,
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33 | random_bitio_state * bs)
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34 | {
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35 | ENCODE_START (f, len)
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36 | ENCODE_PAUSE (*bs)
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37 | }
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38 |
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39 | void
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40 | BIO_Random_Done (random_bitio_state * bs)
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41 | {
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42 | ENCODE_CONTINUE (*bs)
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43 | ENCODE_DONE
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44 | }
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45 |
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46 | void
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47 | BIO_Random_Encode_Bit (int bit, random_bitio_state * bs)
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48 | {
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49 | ENCODE_CONTINUE (*bs)
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50 | ENCODE_BIT (bit);
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51 | ENCODE_PAUSE (*bs)
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52 | }
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53 |
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54 | int
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55 | BIO_Random_Decode_Bit (random_bitio_state * bs)
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56 | {
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57 | register int val;
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58 | DECODE_CONTINUE (*bs)
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59 | val = DECODE_BIT;
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60 | DECODE_PAUSE (*bs)
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61 | return (val);
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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 | BIO_Random_Unary_Encode (unsigned long val, random_bitio_state * bs,
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67 | unsigned long *bits)
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68 | {
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69 | ENCODE_CONTINUE (*bs)
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70 | if (bits)
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71 | UNARY_ENCODE_L (val, *bits);
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72 | else
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73 | UNARY_ENCODE (val);
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74 | ENCODE_PAUSE (*bs)
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75 | }
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76 |
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77 |
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78 | unsigned long
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79 | BIO_Random_Unary_Decode (random_bitio_state * bs,
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80 | unsigned long *bits)
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81 | {
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82 | register unsigned long val;
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83 | DECODE_CONTINUE (*bs)
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84 | if (bits)
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85 | UNARY_DECODE_L (val, *bits);
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86 | else
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87 | UNARY_DECODE (val);
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88 | DECODE_PAUSE (*bs)
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89 | return (val);
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90 | }
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91 |
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92 |
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93 |
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94 |
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95 |
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96 |
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97 |
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98 | void
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99 | BIO_Random_Binary_Encode (unsigned long val, unsigned long b,
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100 | random_bitio_state * bs, unsigned long *bits)
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101 | {
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102 | ENCODE_CONTINUE (*bs)
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103 | if (bits)
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104 | BINARY_ENCODE_L (val, b, *bits);
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105 | else
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106 | BINARY_ENCODE (val, b);
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107 | ENCODE_PAUSE (*bs)
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108 | }
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109 |
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110 |
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111 | unsigned long
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112 | BIO_Random_Binary_Decode (unsigned long b,
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113 | random_bitio_state * bs,
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114 | unsigned long *bits)
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115 | {
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116 | register unsigned long val;
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117 | DECODE_CONTINUE (*bs)
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118 | if (bits)
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119 | BINARY_DECODE_L (val, b, *bits);
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120 | else
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121 | BINARY_DECODE (val, b);
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122 | DECODE_PAUSE (*bs)
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123 | return (val);
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124 | }
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125 |
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126 |
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127 |
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128 |
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129 |
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130 |
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131 |
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132 | void
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133 | BIO_Random_Gamma_Encode (unsigned long val, random_bitio_state * bs,
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134 | unsigned long *bits)
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135 | {
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136 | ENCODE_CONTINUE (*bs)
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137 | if (bits)
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138 | GAMMA_ENCODE_L (val, *bits);
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139 | else
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140 | GAMMA_ENCODE (val);
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141 | ENCODE_PAUSE (*bs)
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142 | }
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143 |
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144 |
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145 | unsigned long
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146 | BIO_Random_Gamma_Decode (random_bitio_state * bs,
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147 | unsigned long *bits)
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148 | {
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149 | register unsigned long val;
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150 | DECODE_CONTINUE (*bs)
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151 | if (bits)
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152 | GAMMA_DECODE_L (val, *bits);
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153 | else
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154 | GAMMA_DECODE (val);
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155 | DECODE_PAUSE (*bs)
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156 | return (val);
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157 | }
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158 |
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159 |
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160 |
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161 |
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162 | void
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163 | BIO_Random_Delta_Encode (unsigned long val, random_bitio_state * bs,
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164 | unsigned long *bits)
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165 | {
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166 | ENCODE_CONTINUE (*bs)
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167 | if (bits)
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168 | DELTA_ENCODE_L (val, *bits);
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169 | else
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170 | DELTA_ENCODE (val);
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171 | ENCODE_PAUSE (*bs)
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172 | }
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173 |
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174 |
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175 | unsigned long
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176 | BIO_Random_Delta_Decode (random_bitio_state * bs,
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177 | unsigned long *bits)
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178 | {
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179 | register unsigned long val;
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180 | DECODE_CONTINUE (*bs)
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181 | if (bits)
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182 | DELTA_DECODE_L (val, *bits);
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183 | else
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184 | DELTA_DECODE (val);
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185 | DECODE_PAUSE (*bs)
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186 | return (val);
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187 | }
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188 |
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189 | void
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190 | BIO_Random_Elias_Encode (unsigned long val, unsigned long b, double s,
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191 | random_bitio_state * bs, unsigned long *bits)
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192 | {
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193 | ENCODE_CONTINUE (*bs)
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194 | if (bits)
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195 | ELIAS_ENCODE_L (val, b, s, *bits);
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196 | else
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197 | ELIAS_ENCODE (val, b, s);
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198 | ENCODE_PAUSE (*bs)
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199 | }
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200 |
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201 |
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202 | unsigned long
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203 | BIO_Random_Elias_Decode (unsigned long b, double s,
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204 | random_bitio_state * bs,
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205 | unsigned long *bits)
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206 | {
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207 | register unsigned long val;
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208 | DECODE_CONTINUE (*bs)
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209 | if (bits)
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210 | ELIAS_DECODE_L (val, b, s, *bits);
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211 | else
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212 | ELIAS_DECODE (val, b, s);
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213 | DECODE_PAUSE (*bs)
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214 | return (val);
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215 | }
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216 |
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217 | void
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218 | BIO_Random_Bblock_Encode (unsigned long val, unsigned long b,
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219 | random_bitio_state * bs, unsigned long *bits)
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220 | {
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221 | ENCODE_CONTINUE (*bs)
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222 | if (bits)
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223 | BBLOCK_ENCODE_L (val, b, *bits);
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224 | else
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225 | BBLOCK_ENCODE (val, b);
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226 | ENCODE_PAUSE (*bs)
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227 | }
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228 |
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229 |
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230 | unsigned long
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231 | BIO_Random_Bblock_Decode (unsigned long b,
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232 | random_bitio_state * bs,
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233 | unsigned long *bits)
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234 | {
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235 | register unsigned long val;
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236 | DECODE_CONTINUE (*bs)
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237 | if (bits)
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238 | BBLOCK_DECODE_L (val, b, *bits);
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239 | else
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240 | BBLOCK_DECODE (val, b);
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241 | DECODE_PAUSE (*bs)
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242 | return (val);
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243 | }
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244 |
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245 | void
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246 | BIO_Random_Seek (unsigned long pos, random_bitio_state * bs)
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247 | {
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248 | ENCODE_CONTINUE (*bs)
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249 | ENCODE_SEEK (pos);
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250 | ENCODE_PAUSE (*bs)
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251 | }
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252 | void
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253 | BIO_Random_Flush (random_bitio_state * bs)
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254 | {
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255 | ENCODE_CONTINUE (*bs)
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256 | ENCODE_FLUSH;
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257 | ENCODE_PAUSE (*bs)
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258 | }
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259 |
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260 | unsigned long
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261 | BIO_Random_Tell (random_bitio_state * bs)
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262 | {
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263 | register unsigned long t;
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264 | ENCODE_CONTINUE (*bs)
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265 | t = ENCODE_TELL;
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266 | ENCODE_PAUSE (*bs)
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267 | return (t);
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268 | }
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269 |
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270 | #ifdef USE_LONG_LONG
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271 |
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272 | void
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273 | BIO_Random_Seek_LL (mg_ullong pos, random_bitio_state * bs)
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274 | {
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275 | ENCODE_CONTINUE(*bs)
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276 |
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277 | if ((((pos) >> 3) >= (mg_ullong)__base) &&
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278 | ((((pos)+7) >> 3) < (mg_ullong)(__base + __len)))
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279 | {
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280 | __pos = (long)((pos) - (mg_ullong)(__base << 3));
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281 | }
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282 | else
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283 | {
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284 | ENCODE_FLUSH;
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285 | __base = (long)(((pos) >> (__sft+3)) << __sft);
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286 |
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287 | fseek(__file,__base,0);
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288 | fread(__buf,1,__len,__file);
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289 | __pos = (long)((pos) & ((8 << __sft)-1));
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290 | }
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291 |
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292 | ENCODE_PAUSE(*bs)
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293 | }
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294 |
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295 | mg_ullong
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296 | BIO_Random_Tell_LL (random_bitio_state * bs)
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297 | {
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298 | mg_ullong t;
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299 | ENCODE_CONTINUE(*bs)
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300 | t = (((mg_ullong)__base) << 3ull) + __pos;
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301 | ENCODE_PAUSE(*bs)
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302 | return(t);
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303 | }
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304 |
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305 | #endif
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