1 | /**************************************************************************
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2 | *
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3 | * bitio_gen.c -- General supoport routines for bitio
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4 | * Copyright (C) 1994 Neil Sharman and Alistair Moffat
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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_gen.c 3001 2002-02-26 21:48:15Z jrm21 $
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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 1.3 2002/02/26 21:48:15 jrm21
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27 | replaced a // comment with /* */, as most c compilers won't like it.
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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 21:16:42 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 09:31:40 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 00:24:38 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_gen.c 3001 2002-02-26 21:48:15Z jrm21 $";
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45 |
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46 | #include "sysfuncs.h"
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47 | #include "bitio_m.h"
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48 |
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49 |
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50 |
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51 |
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52 | int fprintf (FILE *, const char *,...);
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53 |
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54 | unsigned long
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55 | BIO_Unary_Length (unsigned long val)
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56 | {
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57 | register unsigned long num;
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58 | UNARY_LENGTH (val, num);
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59 | return (num);
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60 | }
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61 |
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62 |
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63 | unsigned long
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64 | BIO_Binary_Length (unsigned long val, unsigned long b)
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65 | {
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66 | register unsigned long num;
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67 | BINARY_LENGTH (val, b, num);
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68 | return (num);
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69 | }
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70 |
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71 |
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72 | unsigned long
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73 | BIO_Gamma_Length (unsigned long val)
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74 | {
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75 | register unsigned long num;
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76 | GAMMA_LENGTH (val, num);
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77 | return (num);
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78 | }
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79 |
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80 |
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81 | unsigned long
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82 | BIO_Delta_Length (unsigned long val)
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83 | {
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84 | register unsigned long num;
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85 | DELTA_LENGTH (val, num);
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86 | return (num);
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87 | }
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88 |
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89 |
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90 | unsigned long
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91 | BIO_Elias_Length (unsigned long val, unsigned long b, double s)
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92 | {
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93 | register unsigned long num;
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94 | ELIAS_LENGTH (val, b, s, num);
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95 | return (num);
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96 | }
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97 |
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98 | unsigned long
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99 | BIO_Bblock_Length (unsigned long val, unsigned long b)
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100 | {
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101 | register unsigned long num;
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102 | BBLOCK_LENGTH (val, b, num);
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103 | return (num);
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104 | }
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105 |
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106 |
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107 | int
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108 | BIO_Bblock_Init (int N, int p)
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109 | {
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110 | int b;
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111 | b = (int) (0.5 + 0.6931471 * N / p);
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112 | return (b ? b : 1);
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113 | }
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114 |
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115 |
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116 | int
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117 | BIO_Bblock_Init_W (int N, int p)
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118 | {
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119 | int logb;
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120 | FLOORLOG_2 ((N - p) / p, logb);
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121 | return (logb < 0 ? 1 : (1 << logb));
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122 | }
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123 |
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124 | int
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125 | BIO_Bblock_Bound_b (int N, int p, int b)
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126 | {
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127 | int clogb;
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128 | CEILLOG_2 (b, clogb);
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129 | return (p * (1 + clogb) + (N - p * ((1 << clogb) - b + 1)) / b);
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130 | }
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131 |
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132 | int
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133 | BIO_Bblock_Bound (int N, int p)
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134 | {
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135 | int b;
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136 | b = BIO_Bblock_Init_W (N, p);
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137 | return (BIO_Bblock_Bound_b (N, p, b));
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138 | }
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139 |
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140 |
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141 | /* adjustment is a hack to overcome inaccuracies in floating point,
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142 | where (int)(ln4/ln2) can equal 1, not 2. */
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143 | /* copied from mg-1.3f, 17-09-01 kjm18 */
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144 | int
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145 | BIO_Gamma_Bound (int N, int p)
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146 | {
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147 | /* return ((int) (p * (2 * log2 ((double) N / p) + 1))); */
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148 | return ((int) (p * (2 * log2 (((double) N * 1.0001) / p) + 1)));
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149 | }
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150 |
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151 | int
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152 | floorlog_2 (int b)
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153 | {
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154 | int logb;
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155 | FLOORLOG_2 (b, logb);
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156 | return logb;
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157 | }
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158 |
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159 | int
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160 | ceillog_2 (int b)
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161 | {
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162 | int logb;
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163 | CEILLOG_2 (b, logb);
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164 | return logb;
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165 | }
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