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 | * $Id: bitio_random.c 439 1999-08-10 21:23:37Z sjboddie $
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21 | *
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22 | **************************************************************************/
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23 |
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24 | /*
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25 | $Log$
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26 | Revision 1.1 1999/08/10 21:16:46 sjboddie
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27 | renamed mg-1.3d directory mg
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28 |
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29 | Revision 1.1 1998/11/17 09:31:50 rjmcnab
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30 | *** empty log message ***
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31 |
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32 | * Revision 1.1 1994/08/22 00:24:40 tes
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33 | * Initial placement under CVS.
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34 | *
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35 | */
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36 |
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37 | static char *RCSID = "$Id: bitio_random.c 439 1999-08-10 21:23:37Z sjboddie $";
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38 |
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39 |
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40 |
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41 | #include "sysfuncs.h"
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42 | #include "memlib.h"
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43 |
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44 | #include "bitio_m_random.h"
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45 | #include "bitio_m.h"
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46 |
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47 |
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48 | void
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49 | BIO_Random_Start (FILE * f, unsigned long len,
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50 | random_bitio_state * bs)
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51 | {
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52 | ENCODE_START (f, len)
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53 | ENCODE_PAUSE (*bs)
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54 | }
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55 |
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56 | void
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57 | BIO_Random_Done (random_bitio_state * bs)
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58 | {
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59 | ENCODE_CONTINUE (*bs)
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60 | ENCODE_DONE
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61 | }
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62 |
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63 | void
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64 | BIO_Random_Encode_Bit (int bit, random_bitio_state * bs)
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65 | {
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66 | ENCODE_CONTINUE (*bs)
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67 | ENCODE_BIT (bit);
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68 | ENCODE_PAUSE (*bs)
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69 | }
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70 |
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71 | int
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72 | BIO_Random_Decode_Bit (random_bitio_state * bs)
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73 | {
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74 | register int val;
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75 | DECODE_CONTINUE (*bs)
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76 | val = DECODE_BIT;
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77 | DECODE_PAUSE (*bs)
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78 | return (val);
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79 | }
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80 |
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81 |
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82 | void
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83 | BIO_Random_Unary_Encode (unsigned long val, random_bitio_state * bs,
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84 | unsigned long *bits)
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85 | {
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86 | ENCODE_CONTINUE (*bs)
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87 | if (bits)
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88 | UNARY_ENCODE_L (val, *bits);
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89 | else
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90 | UNARY_ENCODE (val);
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91 | ENCODE_PAUSE (*bs)
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92 | }
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93 |
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94 |
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95 | unsigned long
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96 | BIO_Random_Unary_Decode (random_bitio_state * bs,
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97 | unsigned long *bits)
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98 | {
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99 | register unsigned long val;
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100 | DECODE_CONTINUE (*bs)
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101 | if (bits)
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102 | UNARY_DECODE_L (val, *bits);
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103 | else
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104 | UNARY_DECODE (val);
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105 | DECODE_PAUSE (*bs)
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106 | return (val);
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107 | }
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108 |
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109 |
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110 |
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111 |
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112 |
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113 |
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114 |
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115 | void
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116 | BIO_Random_Binary_Encode (unsigned long val, unsigned long b,
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117 | random_bitio_state * bs, unsigned long *bits)
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118 | {
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119 | ENCODE_CONTINUE (*bs)
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120 | if (bits)
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121 | BINARY_ENCODE_L (val, b, *bits);
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122 | else
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123 | BINARY_ENCODE (val, b);
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124 | ENCODE_PAUSE (*bs)
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125 | }
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126 |
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127 |
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128 | unsigned long
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129 | BIO_Random_Binary_Decode (unsigned long b,
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130 | random_bitio_state * bs,
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131 | unsigned long *bits)
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132 | {
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133 | register unsigned long val;
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134 | DECODE_CONTINUE (*bs)
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135 | if (bits)
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136 | BINARY_DECODE_L (val, b, *bits);
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137 | else
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138 | BINARY_DECODE (val, b);
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139 | DECODE_PAUSE (*bs)
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140 | return (val);
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141 | }
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142 |
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143 |
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144 |
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145 |
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146 |
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147 |
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148 |
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149 | void
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150 | BIO_Random_Gamma_Encode (unsigned long val, random_bitio_state * bs,
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151 | unsigned long *bits)
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152 | {
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153 | ENCODE_CONTINUE (*bs)
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154 | if (bits)
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155 | GAMMA_ENCODE_L (val, *bits);
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156 | else
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157 | GAMMA_ENCODE (val);
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158 | ENCODE_PAUSE (*bs)
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159 | }
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160 |
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161 |
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162 | unsigned long
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163 | BIO_Random_Gamma_Decode (random_bitio_state * bs,
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164 | unsigned long *bits)
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165 | {
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166 | register unsigned long val;
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167 | DECODE_CONTINUE (*bs)
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168 | if (bits)
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169 | GAMMA_DECODE_L (val, *bits);
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170 | else
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171 | GAMMA_DECODE (val);
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172 | DECODE_PAUSE (*bs)
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173 | return (val);
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174 | }
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175 |
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176 |
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177 |
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178 |
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179 | void
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180 | BIO_Random_Delta_Encode (unsigned long val, random_bitio_state * bs,
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181 | unsigned long *bits)
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182 | {
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183 | ENCODE_CONTINUE (*bs)
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184 | if (bits)
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185 | DELTA_ENCODE_L (val, *bits);
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186 | else
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187 | DELTA_ENCODE (val);
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188 | ENCODE_PAUSE (*bs)
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189 | }
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190 |
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191 |
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192 | unsigned long
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193 | BIO_Random_Delta_Decode (random_bitio_state * bs,
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194 | unsigned long *bits)
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195 | {
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196 | register unsigned long val;
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197 | DECODE_CONTINUE (*bs)
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198 | if (bits)
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199 | DELTA_DECODE_L (val, *bits);
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200 | else
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201 | DELTA_DECODE (val);
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202 | DECODE_PAUSE (*bs)
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203 | return (val);
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204 | }
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205 |
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206 | void
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207 | BIO_Random_Elias_Encode (unsigned long val, unsigned long b, double s,
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208 | random_bitio_state * bs, unsigned long *bits)
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209 | {
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210 | ENCODE_CONTINUE (*bs)
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211 | if (bits)
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212 | ELIAS_ENCODE_L (val, b, s, *bits);
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213 | else
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214 | ELIAS_ENCODE (val, b, s);
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215 | ENCODE_PAUSE (*bs)
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216 | }
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217 |
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218 |
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219 | unsigned long
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220 | BIO_Random_Elias_Decode (unsigned long b, double s,
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221 | random_bitio_state * bs,
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222 | unsigned long *bits)
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223 | {
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224 | register unsigned long val;
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225 | DECODE_CONTINUE (*bs)
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226 | if (bits)
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227 | ELIAS_DECODE_L (val, b, s, *bits);
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228 | else
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229 | ELIAS_DECODE (val, b, s);
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230 | DECODE_PAUSE (*bs)
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231 | return (val);
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232 | }
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233 |
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234 | void
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235 | BIO_Random_Bblock_Encode (unsigned long val, unsigned long b,
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236 | random_bitio_state * bs, unsigned long *bits)
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237 | {
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238 | ENCODE_CONTINUE (*bs)
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239 | if (bits)
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240 | BBLOCK_ENCODE_L (val, b, *bits);
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241 | else
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242 | BBLOCK_ENCODE (val, b);
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243 | ENCODE_PAUSE (*bs)
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244 | }
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245 |
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246 |
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247 | unsigned long
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248 | BIO_Random_Bblock_Decode (unsigned long b,
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249 | random_bitio_state * bs,
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250 | unsigned long *bits)
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251 | {
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252 | register unsigned long val;
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253 | DECODE_CONTINUE (*bs)
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254 | if (bits)
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255 | BBLOCK_DECODE_L (val, b, *bits);
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256 | else
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257 | BBLOCK_DECODE (val, b);
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258 | DECODE_PAUSE (*bs)
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259 | return (val);
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260 | }
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261 |
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262 | void
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263 | BIO_Random_Seek (unsigned long pos, random_bitio_state * bs)
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264 | {
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265 | ENCODE_CONTINUE (*bs)
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266 | ENCODE_SEEK (pos);
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267 | ENCODE_PAUSE (*bs)
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268 | }
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269 | void
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270 | BIO_Random_Flush (random_bitio_state * bs)
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271 | {
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272 | ENCODE_CONTINUE (*bs)
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273 | ENCODE_FLUSH;
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274 | ENCODE_PAUSE (*bs)
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275 | }
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276 |
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277 | unsigned long
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278 | BIO_Random_Tell (random_bitio_state * bs)
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279 | {
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280 | register unsigned long t;
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281 | ENCODE_CONTINUE (*bs)
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282 | t = ENCODE_TELL;
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283 | ENCODE_PAUSE (*bs)
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284 | return (t);
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285 | }
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