[3745] | 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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