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 3745 2003-02-20 21:20:24Z mdewsnip $
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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 2003/02/20 21:14:16 mdewsnip
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27 | Addition of MG package for search and retrieval
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28 |
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29 | Revision 1.2 2001/09/21 12:45:03 kjm18
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30 | updated mg to be in line with version mg-1.3f. Now uses long long for
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31 | some variables to enable indexing of very large collections.
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32 |
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33 | Revision 1.1 1999/08/10 21:16:46 sjboddie
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34 | renamed mg-1.3d directory mg
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35 |
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36 | Revision 1.1 1998/11/17 09:31:50 rjmcnab
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37 | *** empty log message ***
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38 |
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39 | * Revision 1.1 1994/08/22 00:24:40 tes
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40 | * Initial placement under CVS.
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41 | *
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42 | */
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43 |
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44 | static char *RCSID = "$Id: bitio_random.c 3745 2003-02-20 21:20:24Z mdewsnip $";
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45 |
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46 |
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47 |
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48 | #include "sysfuncs.h"
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49 | #include "memlib.h"
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50 |
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51 | #include "longlong.h"
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52 |
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53 | #include "bitio_m_random.h"
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54 | #include "bitio_m.h"
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55 |
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56 |
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57 | void
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58 | BIO_Random_Start (FILE * f, unsigned long len,
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59 | random_bitio_state * bs)
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60 | {
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61 | ENCODE_START (f, len)
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62 | ENCODE_PAUSE (*bs)
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63 | }
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64 |
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65 | void
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66 | BIO_Random_Done (random_bitio_state * bs)
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67 | {
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68 | ENCODE_CONTINUE (*bs)
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69 | ENCODE_DONE
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70 | }
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71 |
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72 | void
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73 | BIO_Random_Encode_Bit (int bit, random_bitio_state * bs)
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74 | {
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75 | ENCODE_CONTINUE (*bs)
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76 | ENCODE_BIT (bit);
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77 | ENCODE_PAUSE (*bs)
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78 | }
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79 |
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80 | int
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81 | BIO_Random_Decode_Bit (random_bitio_state * bs)
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82 | {
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83 | register int val;
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84 | DECODE_CONTINUE (*bs)
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85 | val = DECODE_BIT;
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86 | DECODE_PAUSE (*bs)
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87 | return (val);
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88 | }
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89 |
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90 |
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91 | void
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92 | BIO_Random_Unary_Encode (unsigned long val, random_bitio_state * bs,
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93 | unsigned long *bits)
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94 | {
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95 | ENCODE_CONTINUE (*bs)
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96 | if (bits)
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97 | UNARY_ENCODE_L (val, *bits);
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98 | else
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99 | UNARY_ENCODE (val);
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100 | ENCODE_PAUSE (*bs)
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101 | }
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102 |
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103 |
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104 | unsigned long
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105 | BIO_Random_Unary_Decode (random_bitio_state * bs,
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106 | unsigned long *bits)
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107 | {
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108 | register unsigned long val;
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109 | DECODE_CONTINUE (*bs)
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110 | if (bits)
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111 | UNARY_DECODE_L (val, *bits);
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112 | else
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113 | UNARY_DECODE (val);
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114 | DECODE_PAUSE (*bs)
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115 | return (val);
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116 | }
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117 |
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118 |
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119 |
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120 |
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121 |
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122 |
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123 |
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124 | void
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125 | BIO_Random_Binary_Encode (unsigned long val, unsigned long b,
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126 | random_bitio_state * bs, unsigned long *bits)
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127 | {
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128 | ENCODE_CONTINUE (*bs)
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129 | if (bits)
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130 | BINARY_ENCODE_L (val, b, *bits);
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131 | else
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132 | BINARY_ENCODE (val, b);
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133 | ENCODE_PAUSE (*bs)
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134 | }
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135 |
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136 |
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137 | unsigned long
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138 | BIO_Random_Binary_Decode (unsigned long b,
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139 | random_bitio_state * bs,
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140 | unsigned long *bits)
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141 | {
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142 | register unsigned long val;
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143 | DECODE_CONTINUE (*bs)
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144 | if (bits)
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145 | BINARY_DECODE_L (val, b, *bits);
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146 | else
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147 | BINARY_DECODE (val, b);
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148 | DECODE_PAUSE (*bs)
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149 | return (val);
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150 | }
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151 |
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152 |
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153 |
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154 |
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155 |
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156 |
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157 |
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158 | void
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159 | BIO_Random_Gamma_Encode (unsigned long val, random_bitio_state * bs,
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160 | unsigned long *bits)
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161 | {
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162 | ENCODE_CONTINUE (*bs)
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163 | if (bits)
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164 | GAMMA_ENCODE_L (val, *bits);
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165 | else
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166 | GAMMA_ENCODE (val);
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167 | ENCODE_PAUSE (*bs)
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168 | }
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169 |
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170 |
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171 | unsigned long
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172 | BIO_Random_Gamma_Decode (random_bitio_state * bs,
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173 | unsigned long *bits)
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174 | {
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175 | register unsigned long val;
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176 | DECODE_CONTINUE (*bs)
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177 | if (bits)
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178 | GAMMA_DECODE_L (val, *bits);
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179 | else
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180 | GAMMA_DECODE (val);
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181 | DECODE_PAUSE (*bs)
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182 | return (val);
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183 | }
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184 |
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185 |
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186 |
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187 |
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188 | void
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189 | BIO_Random_Delta_Encode (unsigned long val, random_bitio_state * bs,
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190 | unsigned long *bits)
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191 | {
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192 | ENCODE_CONTINUE (*bs)
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193 | if (bits)
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194 | DELTA_ENCODE_L (val, *bits);
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195 | else
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196 | DELTA_ENCODE (val);
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197 | ENCODE_PAUSE (*bs)
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198 | }
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199 |
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200 |
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201 | unsigned long
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202 | BIO_Random_Delta_Decode (random_bitio_state * bs,
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203 | unsigned long *bits)
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204 | {
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205 | register unsigned long val;
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206 | DECODE_CONTINUE (*bs)
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207 | if (bits)
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208 | DELTA_DECODE_L (val, *bits);
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209 | else
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210 | DELTA_DECODE (val);
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211 | DECODE_PAUSE (*bs)
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212 | return (val);
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213 | }
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214 |
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215 | void
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216 | BIO_Random_Elias_Encode (unsigned long val, unsigned long b, double s,
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217 | random_bitio_state * bs, unsigned long *bits)
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218 | {
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219 | ENCODE_CONTINUE (*bs)
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220 | if (bits)
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221 | ELIAS_ENCODE_L (val, b, s, *bits);
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222 | else
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223 | ELIAS_ENCODE (val, b, s);
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224 | ENCODE_PAUSE (*bs)
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225 | }
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226 |
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227 |
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228 | unsigned long
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229 | BIO_Random_Elias_Decode (unsigned long b, double s,
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230 | random_bitio_state * bs,
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231 | unsigned long *bits)
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232 | {
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233 | register unsigned long val;
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234 | DECODE_CONTINUE (*bs)
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235 | if (bits)
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236 | ELIAS_DECODE_L (val, b, s, *bits);
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237 | else
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238 | ELIAS_DECODE (val, b, s);
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239 | DECODE_PAUSE (*bs)
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240 | return (val);
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241 | }
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242 |
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243 | void
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244 | BIO_Random_Bblock_Encode (unsigned long val, unsigned long b,
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245 | random_bitio_state * bs, unsigned long *bits)
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246 | {
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247 | ENCODE_CONTINUE (*bs)
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248 | if (bits)
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249 | BBLOCK_ENCODE_L (val, b, *bits);
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250 | else
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251 | BBLOCK_ENCODE (val, b);
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252 | ENCODE_PAUSE (*bs)
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253 | }
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254 |
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255 |
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256 | unsigned long
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257 | BIO_Random_Bblock_Decode (unsigned long b,
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258 | random_bitio_state * bs,
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259 | unsigned long *bits)
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260 | {
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261 | register unsigned long val;
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262 | DECODE_CONTINUE (*bs)
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263 | if (bits)
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264 | BBLOCK_DECODE_L (val, b, *bits);
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265 | else
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266 | BBLOCK_DECODE (val, b);
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267 | DECODE_PAUSE (*bs)
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268 | return (val);
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269 | }
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270 |
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271 | void
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272 | BIO_Random_Seek (unsigned long pos, random_bitio_state * bs)
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273 | {
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274 | ENCODE_CONTINUE (*bs)
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275 | ENCODE_SEEK (pos);
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276 | ENCODE_PAUSE (*bs)
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277 | }
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278 | void
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279 | BIO_Random_Flush (random_bitio_state * bs)
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280 | {
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281 | ENCODE_CONTINUE (*bs)
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282 | ENCODE_FLUSH;
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283 | ENCODE_PAUSE (*bs)
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284 | }
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285 |
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286 | unsigned long
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287 | BIO_Random_Tell (random_bitio_state * bs)
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288 | {
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289 | register unsigned long t;
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290 | ENCODE_CONTINUE (*bs)
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291 | t = ENCODE_TELL;
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292 | ENCODE_PAUSE (*bs)
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293 | return (t);
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294 | }
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295 |
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296 | #ifdef USE_LONG_LONG
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297 |
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298 | void
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299 | BIO_Random_Seek_LL (mg_ullong pos, random_bitio_state * bs)
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300 | {
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301 | ENCODE_CONTINUE(*bs)
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302 |
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303 | if ((((pos) >> 3) >= (mg_ullong)__base) &&
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304 | ((((pos)+7) >> 3) < (mg_ullong)(__base + __len)))
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305 | {
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306 | __pos = (long)((pos) - (mg_ullong)(__base << 3));
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307 | }
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308 | else
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309 | {
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310 | ENCODE_FLUSH;
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311 | __base = (long)(((pos) >> (__sft+3)) << __sft);
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312 |
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313 | fseek(__file,__base,0);
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314 | fread(__buf,1,__len,__file);
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315 | __pos = (long)((pos) & ((8 << __sft)-1));
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316 | }
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317 |
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318 | ENCODE_PAUSE(*bs)
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319 | }
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320 |
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321 | mg_ullong
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322 | BIO_Random_Tell_LL (random_bitio_state * bs)
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323 | {
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324 | mg_ullong t;
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325 | ENCODE_CONTINUE(*bs)
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326 | t = (((mg_ullong)__base) << 3ull) + __pos;
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327 | ENCODE_PAUSE(*bs)
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328 | return(t);
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329 | }
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330 |
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331 | #endif
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