1 | /**************************************************************************
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2 | *
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3 | * perf_hash.c -- Perfect hashing functions
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4 | * Copyright (C) 1992 Bohdan S. Majewski
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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 | * 1994 Neil Sharman
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23 | * Small modifications were made to the interface so that it fitted in
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24 | * with mg.
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25 | *
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26 | **************************************************************************/
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27 |
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28 | #define STRUCT
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29 |
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30 | #include <time.h> /* for call to time () in SEED_RANDOM() */
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31 | #include "sysfuncs.h"
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32 |
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33 | #include "local_strings.h"
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34 | #include "memlib.h"
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35 | #include "messages.h"
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36 | #include "perf_hash.h"
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37 | #include "netorder.h" /* [RPAP - Jan 97: Endian Ordering] */
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38 |
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39 | #define FALSE 0
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40 | #define TRUE 1
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41 |
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42 | #define STATIC 0
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43 |
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44 | /* Random Number stuff */
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45 |
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46 | long irandm (long is[2]); /* from random.c */
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47 |
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48 | static long seed[] = {0, 0};
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49 | #define RANDOM() irandm(seed)
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50 | #define SEED_RANDOM(the_seed) do{ seed[0] = the_seed; }while(0)
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51 |
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52 | /* Max number of keys - must be a power of 2 minus 1 */
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53 | static int MAX_M;
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54 |
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55 |
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56 | static int MAX_CH;
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57 |
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58 |
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59 | /* the width of the mapping tables */
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60 | static int MAX_L;
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61 |
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62 |
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63 |
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64 | #define c 1.23
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65 | static int MAX_N;
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66 |
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67 |
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68 |
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69 |
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70 | static u_char *translate;
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71 |
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72 | #define MEMBER 0
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73 | #define ERASED 1
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74 |
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75 |
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76 |
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77 | /* direction constants for the edge oriented 3-graph representation */
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78 | #define A 0
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79 | #define B (MAX_M)
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80 | #define C (2*B)
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81 |
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82 | /* NODEa, NODEb, NODEc, FIRST and NEXT are used to represent a 3-graph */
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83 | static int *NODEa, *NODEb, *NODEc;
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84 | static int *FIRST;
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85 | static int *NEXT;
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86 |
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87 |
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88 | #define norm(e) ((e) % MAX_M)
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89 | /* in general should be ((e) % MAX_M) but MAX_M = 2^k - 1 */
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90 |
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91 |
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92 | static char *mk; /* for marking edges/vertices as removed */
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93 | static int *g; /* array g defines a minimal perfect hash function */
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94 |
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95 |
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96 |
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97 | /* stack of edges, created during the independency */
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98 | /* test, used in the assignment step */
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99 | static struct
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100 | {
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101 | int sp;
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102 | int *st;
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103 | }
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104 | S;
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105 | #define push(s, e) s.st[s.sp++] = (e)
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106 | #define pop(s, e) e = s.st[--s.sp]
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107 |
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108 | #ifndef STRUCT
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109 | static long **tb0, **tb1, **tb2;
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110 | #else
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111 | struct tb_entry **tb;
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112 | #endif
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113 |
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114 |
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115 | static int
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116 | unique (int v)
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117 | { /* checks if vertex v belongs to only one edge */
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118 | return (FIRST[v] != 0 && NEXT[FIRST[v]] == 0) ? FIRST[v] : 0;
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119 | } /*unique */
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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 |
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125 |
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126 |
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127 |
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128 | static void
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129 | _delete (int v, int e)
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130 | { /* deletes edge e from list of v */
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131 |
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132 | int b;
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133 |
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134 | b = FIRST[v];
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135 | assert (norm (b) != 0);
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136 | if (norm (b) == e)
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137 | FIRST[v] = NEXT[FIRST[v]];
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138 | else
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139 | {
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140 | while (norm (NEXT[b]) != e)
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141 | {
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142 | b = NEXT[b];
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143 | assert (norm (b) != 0);
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144 | }
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145 | NEXT[b] = NEXT[NEXT[b]];
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146 | }
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147 | } /*delete */
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148 |
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149 |
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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 | #if 0
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155 | /* recursively removes the edges of a 3-graph which have at least */
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156 | /* one unique vertex. The removed edges are placed on stack S */
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157 | static void
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158 | ph_remove (int e, int v)
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159 | {
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160 | int b;
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161 | mk[e] = ERASED;
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162 | push (S, e);
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163 |
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164 | if (NODEa[e] != v)
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165 | _delete (NODEa[e], e);
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166 | if (NODEb[e] != v)
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167 | _delete (NODEb[e], e);
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168 | if (NODEc[e] != v)
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169 | _delete (NODEc[e], e);
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170 |
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171 | if (NODEa[e] != v && mk[b = norm (unique (NODEa[e]))] == MEMBER)
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172 | ph_remove (b, NODEa[e]);
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173 | if (NODEb[e] != v && mk[b = norm (unique (NODEb[e]))] == MEMBER)
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174 | ph_remove (b, NODEb[e]);
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175 | if (NODEc[e] != v && mk[b = norm (unique (NODEc[e]))] == MEMBER)
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176 | ph_remove (b, NODEc[e]);
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177 | }
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178 | #else
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179 |
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180 |
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181 | static int StackPos, StackMax;
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182 | static struct Stack
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183 | {
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184 | int e, v, m;
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185 | }
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186 | *Stack = NULL;
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187 |
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188 | #define StackAdd(_e, _v, _m) \
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189 | do { \
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190 | if (StackPos == StackMax) \
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191 | { \
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192 | StackMax <<= 1; \
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193 | if (!(Stack = (struct Stack *)Xrealloc(Stack, sizeof(*Stack) * StackMax))) \
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194 | return(-1); \
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195 | } \
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196 | Stack[StackPos].e = (_e); \
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197 | Stack[StackPos].v = (_v); \
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198 | Stack[StackPos++].m = (_m); \
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199 | } while(0)
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200 |
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201 |
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202 | static int
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203 | ph_remove (int e, int v)
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204 | {
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205 | if (!Stack)
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206 | {
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207 | StackMax = 256;
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208 | if (!(Stack = (struct Stack *) Xmalloc (sizeof (*Stack) * StackMax)))
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209 | return (-1);
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210 | StackPos = 0;
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211 | }
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212 | Stack[StackPos].e = e;
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213 | Stack[StackPos].v = v;
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214 | Stack[StackPos].m = 0;
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215 | ++StackPos;
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216 | while (StackPos)
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217 | {
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218 | int m, b;
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219 | --StackPos;
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220 | e = Stack[StackPos].e;
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221 | v = Stack[StackPos].v;
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222 | m = Stack[StackPos].m;
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223 |
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224 |
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225 | switch (m)
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226 | {
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227 | case 0:
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228 | {
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229 | mk[e] = ERASED;
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230 | push (S, e);
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231 |
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232 | if (NODEa[e] != v)
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233 | _delete (NODEa[e], e);
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234 | if (NODEb[e] != v)
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235 | _delete (NODEb[e], e);
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236 | if (NODEc[e] != v)
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237 | _delete (NODEc[e], e);
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238 |
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239 | if (NODEa[e] != v && mk[b = norm (unique (NODEa[e]))] == MEMBER)
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240 | {
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241 | Stack[StackPos++].m = 1;
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242 | StackAdd (b, NODEa[e], 0);
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243 | break;
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244 | }
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245 | }
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246 | case 1:
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247 | {
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248 | if (NODEb[e] != v && mk[b = norm (unique (NODEb[e]))] == MEMBER)
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249 | {
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250 | Stack[StackPos++].m = 2;
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251 | StackAdd (b, NODEb[e], 0);
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252 | break;
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253 | }
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254 | }
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255 | case 2:
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256 | if (NODEc[e] != v && mk[b = norm (unique (NODEc[e]))] == MEMBER)
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257 | StackAdd (b, NODEc[e], 0);
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258 | }
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259 | }
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260 | return (0);
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261 | }
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262 | #endif
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263 |
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264 |
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265 |
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266 |
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267 |
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268 | /* returns TRUE if and only if set of edges created in the tree_builder */
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269 | /* procedure form a 3-graph with independent edges. Edges of a 3-graph */
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270 | /* are independent iff repeated deletion of edges containing vertices */
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271 | /* of degree 1 results in a graph with no edges in it. */
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272 | static int
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273 | acyclic (int m, int n)
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274 | {
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275 |
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276 | int v, e;
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277 | /* build list of edges for each node */
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278 | for (v = 1; v <= n; FIRST[v++] = 0);
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279 | for (e = 1; e <= m; ++e)
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280 | {
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281 | NEXT[A + e] = FIRST[NODEa[e]];
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282 | FIRST[NODEa[e]] = A + e;
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283 | NEXT[B + e] = FIRST[NODEb[e]];
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284 | FIRST[NODEb[e]] = B + e;
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285 | NEXT[C + e] = FIRST[NODEc[e]];
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286 | FIRST[NODEc[e]] = C + e;
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287 |
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288 | /* mark edge e as belonging to the hypergraph */
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289 | mk[e] = MEMBER;
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290 | }
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291 |
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292 |
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293 | S.sp = 0; /* empty the stack */
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294 | mk[0] = ERASED; /* a sentinel for the test below */
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295 | for (v = 1; v <= n; ++v)
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296 | {
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297 | if (mk[e = norm (unique (v))] == MEMBER)
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298 | ph_remove (e, v);
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299 | }
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300 |
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301 | /* check if any edges were left in the graph */
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302 | return S.sp == m;
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303 | } /*acyclic */
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304 |
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305 |
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306 |
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307 |
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308 |
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309 |
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310 |
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311 |
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312 | /* repeatedly maps words into edges of a 3-graph until the edges */
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313 | /* are independent. */
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314 | static int
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315 | tree_builder (int num, u_char ** keys, int *n)
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316 | {
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317 |
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318 | int e, k = 0;
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319 | int i, j;
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320 | u_char *w;
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321 |
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322 | do
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323 | {
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324 | *n = (int) (num * c + 1);
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325 | /* initialize tables of random integers */
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326 | for (i = 0; i < MAX_CH; ++i)
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327 | for (j = 0; j < MAX_L; ++j)
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328 | {
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329 | #ifndef STRUCT
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330 | tb0[i][j] = RANDOM () % *n;
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331 | tb1[i][j] = RANDOM () % *n;
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332 | tb2[i][j] = RANDOM () % *n;
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333 | #else
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334 | struct tb_entry *tbp = &tb[i][j];
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335 | tbp->tb0 = RANDOM () % *n;
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336 | tbp->tb1 = RANDOM () % *n;
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337 | tbp->tb2 = RANDOM () % *n;
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338 | #endif
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339 | }
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340 |
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341 | /* compute an edge (NODEa[e], NODEb[e], NODEc[e]) for each word */
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342 | for (e = 1; e <= num; ++e)
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343 | {
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344 | /*generate an edge corresponding to the ith word */
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345 | int x = 0, y = 0, z = 0, l;
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346 | w = keys[e - 1];
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347 |
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348 | l = *w++;
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349 | j = (l - 1) % MAX_L;
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350 |
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351 | do
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352 | {
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353 | #ifndef STRUCT
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354 | x += tb0[translate[*w]][j];
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355 | y += tb1[translate[*w]][j];
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356 | z += tb2[translate[*w]][j];
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357 | #else
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358 | struct tb_entry *tbp = &tb[translate[*w]][j];
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359 | x += tbp->tb0;
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360 | y += tbp->tb1;
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361 | z += tbp->tb2;
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362 | #endif
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363 | if (++j >= MAX_L)
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364 | j = 0;
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365 | ++w;
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366 | }
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367 | while (--l);
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368 | x = (x % *n) + 1;
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369 | y = (y % *n) + 1;
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370 | z = (z % *n) + 1;
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371 | if (y == x && ++y > *n)
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372 | y = 1;
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373 | if (z == x && ++z > *n)
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374 | z = 1;
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375 | if (z == y)
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376 | {
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377 | if (++z > *n)
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378 | z = 1;
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379 | if (z == x && ++z > *n)
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380 | z = 1;
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381 | }
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382 |
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383 | NODEa[e] = x;
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384 | NODEb[e] = y;
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385 | NODEc[e] = z;
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386 | }
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387 | if (++k > 50) /* make sure we will not wait for ever */
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388 | FatalError (1, "Unable to generate the perfect hash function. "
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389 | "This is probably because there aren't enough words");
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390 | }
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391 | while (!acyclic (num, *n));
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392 | return k;
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393 | } /*tree_builder */
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394 |
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395 |
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396 |
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397 |
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398 |
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399 |
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400 |
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401 |
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402 |
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403 | /* calculates values of the g function/array so that i-th word is */
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404 | /* placed at the (i-1)st position of a hash table. */
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405 | static void
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406 | assign (int n)
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407 | {
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408 |
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409 | int v, w = 0, e;
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410 |
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411 | /* mark all the vertices of the 3-graph as unassigned */
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412 | for (v = 1; v <= n; mk[v++] = FALSE);
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413 |
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414 | while (S.sp > 0)
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415 | {
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416 | int _xor = 0;
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417 | pop (S, e);
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418 | v = NODEa[e];
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419 | if (mk[v])
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420 | _xor ^= g[v];
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421 | else
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422 | {
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423 | g[w = v] = 0;
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424 | mk[v] = TRUE;
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425 | }
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426 | v = NODEb[e];
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427 | if (mk[v])
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428 | _xor ^= g[v];
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429 | else
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430 | {
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431 | g[w = v] = 0;
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432 | mk[v] = TRUE;
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433 | }
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434 | v = NODEc[e];
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435 | if (mk[v])
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436 | _xor ^= g[v];
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437 | else
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438 | {
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439 | g[w = v] = 0;
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440 | mk[v] = TRUE;
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441 | }
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442 | g[w] = (e - 1) ^ _xor;
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443 | }
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444 | } /*assign */
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445 |
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446 |
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447 |
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448 |
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449 |
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450 |
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451 |
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452 |
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453 |
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454 | /*check returns 0 if no error in mphf is detected, else returns error code */
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455 | static int
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456 | check (int m)
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457 | {
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458 |
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459 | int e, err_code = 0;
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460 |
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461 | /*for each word compute its place in hash table and check if correct */
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462 | for (e = 1; e <= m; ++e)
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463 | {
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464 | if ((e - 1) != (g[NODEa[e]] ^ g[NODEb[e]] ^ g[NODEc[e]]))
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465 | {
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466 | (void) fprintf (stderr, "Error for %dth word detected.\n", e);
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467 | err_code = e;
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468 | }
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469 | }
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470 | return err_code;
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471 | } /*check */
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472 |
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473 |
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474 |
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475 |
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476 |
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477 |
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478 |
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479 | #if 0
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480 | void
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481 | outputh (int m, int n)
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482 | {
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483 |
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484 | int i, j, w = (int) ceil (log10 ((double) n + 1.0)) + 1;
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485 |
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486 | #if 0
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487 | char *PRG =
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488 | "int h(char *s)\n"
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489 | "{\n"
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490 | " int u, v, w, i;\n"
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491 | "i = (strlen(s) - 1) % _HXL;\n"
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492 | " u = v = w = 0;\n"
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493 | " while(*s)\n"
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494 | " {\n"
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495 | " u += mt1[(*s) - _HFC][i];\n"
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496 | " v += mt2[(*s) - _HFC][i];\n"
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497 | " w += mt3[(*s++) - _HFC][i];\n"
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498 | " if(++i >= _HXL) i = 0;\n"
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499 | " }\n"
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500 | " u %= _HFN; v %= _HFN; w %= _HFN;\n"
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501 | " if(u == v && ++v >= _HFN) v = 0;\n"
|
---|
502 | " if(w == u && ++w >= _HFN) w = 0;\n"
|
---|
503 | " if(w == v && ++w >= _HFN) w = 0;\n"
|
---|
504 | " if(w == u && ++w >= _HFN) w = 0;\n"
|
---|
505 | " return (g[u] ^ g[v] ^ g[w]) % _HFM;\n"
|
---|
506 | "};\n\n";
|
---|
507 | #endif
|
---|
508 |
|
---|
509 | char *PRG =
|
---|
510 | "int h(char *s)\n"
|
---|
511 | "{\n"
|
---|
512 | " int u, v, w, i;\n"
|
---|
513 | " i = (strlen(s) - 1) % _HXL;\n"
|
---|
514 | " u = v = w = 0;\n"
|
---|
515 | " while(*s)\n"
|
---|
516 | " {\n"
|
---|
517 | " if((u += mt1[(*s) - _HFC][i]) >= _HFN) u -= _HFN;\n"
|
---|
518 | " if((v += mt2[(*s) - _HFC][i]) >= _HFN) v -= _HFN;\n"
|
---|
519 | " if((w += mt3[(*s++) - _HFC][i]) >= _HFN) w -= _HFN;\n"
|
---|
520 | " if(++i >= _HXL) i = 0;\n"
|
---|
521 | " }\n"
|
---|
522 | " if(u == v && ++v >= _HFN) v = 0;\n"
|
---|
523 | " if(w == v) \n"
|
---|
524 | " {\n"
|
---|
525 | " if(++w >= _HFN) w = 0;\n"
|
---|
526 | " if(w == u && ++w >= _HFN) w = 0;\n"
|
---|
527 | " }\n"
|
---|
528 | " else\n"
|
---|
529 | " if(w == u)\n"
|
---|
530 | " {\n"
|
---|
531 | " if(++w >= _HFN) w = 0;\n"
|
---|
532 | " if(w == v && ++w >= _HFN) w = 0;\n"
|
---|
533 | " }\n"
|
---|
534 | " return ((g[u] ^ g[v] ^ g[w]) > _HFM)? 0 : (g[u] ^ g[v] ^ g[w]);\n"
|
---|
535 | "}\n\n";
|
---|
536 |
|
---|
537 | printf ("#define _HFN %d\n#define _HFC %d\n", n, fc);
|
---|
538 | printf ("#define _HFM %d\n#define _HXL %d\n", m, MAX_L);
|
---|
539 | printf ("#define _HFA %d\n\nstatic int g[_HFN] = {\n", lc - fc + 1);
|
---|
540 | for (i = 1; i < n; ++i)
|
---|
541 | {
|
---|
542 | if (i % 8 == 0)
|
---|
543 | putchar ('\n');
|
---|
544 | printf ("%5d, ", g[i]);
|
---|
545 | }
|
---|
546 | printf ("%5d};\n\n", g[n]);
|
---|
547 |
|
---|
548 | printf ("static int mt1[_HFA][_HXL] = {\n");
|
---|
549 | for (j = fc; j < lc; ++j)
|
---|
550 | {
|
---|
551 | printf ("{");
|
---|
552 | for (i = 0; i < MAX_L - 1; ++i)
|
---|
553 | printf ("%*d,", w, tb0[j][i]);
|
---|
554 | printf ("%*d},\n", w, tb0[j][MAX_L - 1]);
|
---|
555 | }
|
---|
556 | printf ("{");
|
---|
557 | for (i = 0; i < MAX_L - 1; ++i)
|
---|
558 | printf ("%*d,", w, tb0[lc][i]);
|
---|
559 | printf ("%*d}\n", w, tb0[lc][MAX_L - 1]);
|
---|
560 | printf ("};\n\n");
|
---|
561 |
|
---|
562 | printf ("static int mt2[_HFA][_HXL] = {\n");
|
---|
563 | for (j = fc; j < lc; ++j)
|
---|
564 | {
|
---|
565 | printf ("{");
|
---|
566 | for (i = 0; i < MAX_L - 1; ++i)
|
---|
567 | printf ("%*d,", w, tb1[j][i]);
|
---|
568 | printf ("%*d},\n", w, tb1[j][MAX_L - 1]);
|
---|
569 | }
|
---|
570 | printf ("{");
|
---|
571 | for (i = 0; i < MAX_L - 1; ++i)
|
---|
572 | printf ("%*d,", w, tb1[lc][i]);
|
---|
573 | printf ("%*d}\n", w, tb1[lc][MAX_L - 1]);
|
---|
574 | printf ("};\n\n");
|
---|
575 |
|
---|
576 | printf ("static int mt3[_HFA][_HXL] = {\n");
|
---|
577 | for (j = fc; j < lc; ++j)
|
---|
578 | {
|
---|
579 | printf ("{");
|
---|
580 | for (i = 0; i < MAX_L - 1; ++i)
|
---|
581 | printf ("%*d,", w, tb2[j][i]);
|
---|
582 | printf ("%*d},\n", w, tb2[j][MAX_L - 1]);
|
---|
583 | }
|
---|
584 | printf ("{");
|
---|
585 | for (i = 0; i < MAX_L - 1; ++i)
|
---|
586 | printf ("%*d,", w, tb2[lc][i]);
|
---|
587 | printf ("%*d}\n", w, tb2[lc][MAX_L - 1]);
|
---|
588 | printf ("};\n\n");
|
---|
589 |
|
---|
590 | printf ("%s", PRG);
|
---|
591 | } /*outputh */
|
---|
592 | #endif
|
---|
593 |
|
---|
594 |
|
---|
595 |
|
---|
596 |
|
---|
597 |
|
---|
598 |
|
---|
599 |
|
---|
600 | static void
|
---|
601 | make_trans_func (int num, u_char ** keys)
|
---|
602 | {
|
---|
603 | int i, j;
|
---|
604 |
|
---|
605 | memset (translate, '\0', sizeof (translate));
|
---|
606 |
|
---|
607 | MAX_L = 1;
|
---|
608 | for (i = 0; i < num; ++i)
|
---|
609 | {
|
---|
610 | unsigned len = keys[i][0];
|
---|
611 | u_char *s = keys[i] + 1;
|
---|
612 | for (; len; len--, ++s)
|
---|
613 | translate[*s] = 1;
|
---|
614 | if (i)
|
---|
615 | {
|
---|
616 | int l;
|
---|
617 | l = prefixlen (keys[i - 1], keys[i]);
|
---|
618 | if (l + 1 > MAX_L)
|
---|
619 | MAX_L = l + 1;
|
---|
620 | }
|
---|
621 | }
|
---|
622 | j = 0;
|
---|
623 | for (i = 0; i < 256; ++i)
|
---|
624 | if (translate[i])
|
---|
625 | translate[i] = j++;
|
---|
626 | MAX_CH = j;
|
---|
627 | }
|
---|
628 |
|
---|
629 |
|
---|
630 | static void
|
---|
631 | temp_free (void)
|
---|
632 | {
|
---|
633 | if (NODEa)
|
---|
634 | Xfree (NODEa);
|
---|
635 | if (NODEb)
|
---|
636 | Xfree (NODEb);
|
---|
637 | if (NODEc)
|
---|
638 | Xfree (NODEc);
|
---|
639 | if (FIRST)
|
---|
640 | Xfree (FIRST);
|
---|
641 | if (NEXT)
|
---|
642 | Xfree (NEXT);
|
---|
643 | if (S.st)
|
---|
644 | Xfree (S.st);
|
---|
645 | if (mk)
|
---|
646 | Xfree (mk);
|
---|
647 | }
|
---|
648 |
|
---|
649 | static void
|
---|
650 | all_free (void)
|
---|
651 | {
|
---|
652 | int i;
|
---|
653 | temp_free ();
|
---|
654 | if (translate)
|
---|
655 | Xfree (translate);
|
---|
656 | if (g)
|
---|
657 | Xfree (g);
|
---|
658 | #ifndef STRUCT
|
---|
659 | for (i = 0; i < MAX_CH; ++i)
|
---|
660 | {
|
---|
661 | if (tb0 && tb0[i])
|
---|
662 | Xfree (tb0[i]);
|
---|
663 | if (tb1 && tb1[i])
|
---|
664 | Xfree (tb1[i]);
|
---|
665 | if (tb2 && tb2[i])
|
---|
666 | Xfree (tb2[i]);
|
---|
667 | }
|
---|
668 | if (tb0)
|
---|
669 | Xfree (tb0);
|
---|
670 | if (tb1)
|
---|
671 | Xfree (tb1);
|
---|
672 | if (tb2)
|
---|
673 | Xfree (tb2);
|
---|
674 | #else
|
---|
675 | for (i = 0; i < MAX_CH; ++i)
|
---|
676 | if (tb && tb[i])
|
---|
677 | Xfree (tb[i]);
|
---|
678 | if (tb)
|
---|
679 | Xfree (tb);
|
---|
680 | #endif
|
---|
681 | }
|
---|
682 |
|
---|
683 | static int
|
---|
684 | allocate_memory (void)
|
---|
685 | {
|
---|
686 | int i, ok = 1;
|
---|
687 | NODEa = (int *) Xmalloc (sizeof (int) * (MAX_M + 1));
|
---|
688 | NODEb = (int *)Xmalloc (sizeof (int) * (MAX_M + 1));
|
---|
689 | NODEc = (int *)Xmalloc (sizeof (int) * (MAX_M + 1));
|
---|
690 | FIRST = (int *)Xmalloc (sizeof (int) * (MAX_N + 1));
|
---|
691 | NEXT = (int *)Xmalloc (sizeof (int) * (MAX_M + 1) * 3);
|
---|
692 | S.st = (int *)Xmalloc (sizeof (int) * MAX_M);
|
---|
693 | mk = (char *)Xmalloc (sizeof (char) * (MAX_N + 1));
|
---|
694 | g = (int *)Xmalloc (sizeof (int) * (MAX_N + 1));
|
---|
695 | #ifndef STRUCT
|
---|
696 | tb0 = Xmalloc (sizeof (int *) * MAX_CH);
|
---|
697 | tb1 = Xmalloc (sizeof (int *) * MAX_CH);
|
---|
698 | tb2 = Xmalloc (sizeof (int *) * MAX_CH);
|
---|
699 | for (i = 0; i < MAX_CH; ++i)
|
---|
700 | {
|
---|
701 | if (tb0)
|
---|
702 | if (!(tb0[i] = Xmalloc (sizeof (long) * MAX_L)))
|
---|
703 | ok = 0;
|
---|
704 | if (tb1)
|
---|
705 | if (!(tb1[i] = Xmalloc (sizeof (long) * MAX_L)))
|
---|
706 | ok = 0;
|
---|
707 | if (tb2)
|
---|
708 | if (!(tb2[i] = Xmalloc (sizeof (long) * MAX_L)))
|
---|
709 | ok = 0;
|
---|
710 | }
|
---|
711 |
|
---|
712 | if (!(NODEa && NODEb && NODEc && FIRST && NEXT && S.st && mk && g &&
|
---|
713 | tb0 && tb1 && tb2 && ok))
|
---|
714 | {
|
---|
715 | all_free ();
|
---|
716 | return (-1);
|
---|
717 | }
|
---|
718 | #else
|
---|
719 | tb = (tb_entry **)Xmalloc (sizeof (struct tb_entry *) * MAX_CH);
|
---|
720 | for (i = 0; i < MAX_CH; ++i)
|
---|
721 | if (tb)
|
---|
722 | if (!(tb[i] = (tb_entry *)Xmalloc (sizeof (struct tb_entry) * MAX_L)))
|
---|
723 | ok = 0;
|
---|
724 |
|
---|
725 | if (!(NODEa && NODEb && NODEc && FIRST && NEXT && S.st && mk && g &&
|
---|
726 | tb && ok))
|
---|
727 | {
|
---|
728 | all_free ();
|
---|
729 | return (-1);
|
---|
730 | }
|
---|
731 | #endif
|
---|
732 | return (0);
|
---|
733 | }
|
---|
734 |
|
---|
735 |
|
---|
736 | perf_hash_data *
|
---|
737 | gen_hash_func (int num, u_char ** keys, int r)
|
---|
738 | {
|
---|
739 | int n;
|
---|
740 | perf_hash_data *phd;
|
---|
741 | translate = (u_char *)Xmalloc (sizeof (u_char) * 256);
|
---|
742 | memset(translate, '\0', sizeof (u_char) * 256); /* [RPAP - Feb 97: WIN32 Port] */
|
---|
743 | make_trans_func (num, keys);
|
---|
744 |
|
---|
745 | if (r <= 0)
|
---|
746 | SEED_RANDOM ((long) time ((time_t *) NULL));
|
---|
747 | else
|
---|
748 | SEED_RANDOM (r);
|
---|
749 |
|
---|
750 | MAX_M = num + 1;
|
---|
751 |
|
---|
752 | MAX_N = MAX_M + MAX_M / 4;
|
---|
753 |
|
---|
754 | if (allocate_memory () == -1)
|
---|
755 | return (NULL);
|
---|
756 |
|
---|
757 | /* construct an "acyclic" hypergraph */
|
---|
758 | tree_builder (num, keys, &n);
|
---|
759 | /* compute function g */
|
---|
760 | assign (n);
|
---|
761 |
|
---|
762 | if (check (num) != 0)
|
---|
763 | FatalError (1, "An error has been detected in the mphf.");
|
---|
764 | temp_free ();
|
---|
765 |
|
---|
766 | if (!(phd = (perf_hash_data *)Xmalloc (sizeof (perf_hash_data))))
|
---|
767 | return (NULL);
|
---|
768 |
|
---|
769 | memcpy ((void *) g, (const void *) &g[1], n * sizeof (int));
|
---|
770 |
|
---|
771 | phd->MAX_L = MAX_L;
|
---|
772 | phd->MAX_N = n;
|
---|
773 | phd->MAX_M = num;
|
---|
774 | phd->MAX_CH = MAX_CH;
|
---|
775 | phd->translate = translate;
|
---|
776 | phd->g = g;
|
---|
777 | #ifndef STRUCT
|
---|
778 | phd->tb0 = tb0;
|
---|
779 | phd->tb1 = tb1;
|
---|
780 | phd->tb2 = tb2;
|
---|
781 | #else
|
---|
782 | phd->tb = tb;
|
---|
783 | #endif
|
---|
784 | return (phd);
|
---|
785 | }
|
---|
786 |
|
---|
787 | int
|
---|
788 | write_perf_hash_data (FILE * f, perf_hash_data * phd)
|
---|
789 | {
|
---|
790 | int tot, i;
|
---|
791 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
792 | HTONSI(phd->MAX_L);
|
---|
793 | HTONSI(phd->MAX_N);
|
---|
794 | HTONSI(phd->MAX_M);
|
---|
795 | HTONSI(phd->MAX_CH);
|
---|
796 |
|
---|
797 | tot = fwrite ((char *) &phd->MAX_L, sizeof (int), 1, f) * sizeof (int);
|
---|
798 | tot += fwrite ((char *) &phd->MAX_N, sizeof (int), 1, f) * sizeof (int);
|
---|
799 | tot += fwrite ((char *) &phd->MAX_M, sizeof (int), 1, f) * sizeof (int);
|
---|
800 | tot += fwrite ((char *) &phd->MAX_CH, sizeof (int), 1, f) * sizeof (int);
|
---|
801 |
|
---|
802 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
803 | NTOHSI(phd->MAX_L);
|
---|
804 | NTOHSI(phd->MAX_N);
|
---|
805 | NTOHSI(phd->MAX_M);
|
---|
806 | NTOHSI(phd->MAX_CH);
|
---|
807 |
|
---|
808 | tot += fwrite ((char *) phd->translate, sizeof (u_char), 256, f);
|
---|
809 |
|
---|
810 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
811 | for (i = 0; i < phd->MAX_N + 1; ++i)
|
---|
812 | HTONSI(phd->g[i]);
|
---|
813 |
|
---|
814 | tot += fwrite ((char *) phd->g, sizeof (int), phd->MAX_N + 1, f) * sizeof (int);
|
---|
815 |
|
---|
816 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
817 | for (i = 0; i < phd->MAX_N + 1; ++i)
|
---|
818 | NTOHSI(phd->g[i]);
|
---|
819 |
|
---|
820 | #ifndef STRUCT
|
---|
821 | for (i = 0; i < phd->MAX_CH; ++i)
|
---|
822 | {
|
---|
823 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
824 | int j;
|
---|
825 | for (j = 0; j < phd->MAX_L; ++j)
|
---|
826 | {
|
---|
827 | HTONSI(phd->tb0[i][j]);
|
---|
828 | HTONSI(phd->tb1[i][j]);
|
---|
829 | HTONSI(phd->tb2[i][j]);
|
---|
830 | }
|
---|
831 |
|
---|
832 | tot += fwrite ((char *) phd->tb0[i], sizeof (int), phd->MAX_L, f) *
|
---|
833 | sizeof (int);
|
---|
834 | tot += fwrite ((char *) phd->tb1[i], sizeof (int), phd->MAX_L, f) *
|
---|
835 | sizeof (int);
|
---|
836 | tot += fwrite ((char *) phd->tb2[i], sizeof (int), phd->MAX_L, f) *
|
---|
837 | sizeof (int);
|
---|
838 |
|
---|
839 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
840 | for (j = 0; j < phd->MAX_L; ++j)
|
---|
841 | {
|
---|
842 | NTOHSI(phd->tb0[i][j]);
|
---|
843 | NTOHSI(phd->tb1[i][j]);
|
---|
844 | NTOHSI(phd->tb2[i][j]);
|
---|
845 | }
|
---|
846 | }
|
---|
847 | #else
|
---|
848 | for (i = 0; i < phd->MAX_CH; ++i)
|
---|
849 | {
|
---|
850 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
851 | int j;
|
---|
852 | for (j = 0; j < phd->MAX_L; ++j)
|
---|
853 | {
|
---|
854 | HTONSL(phd->tb[i][j].tb0);
|
---|
855 | HTONSL(phd->tb[i][j].tb1);
|
---|
856 | HTONSL(phd->tb[i][j].tb2);
|
---|
857 | }
|
---|
858 |
|
---|
859 | tot += fwrite ((char *) phd->tb[i], sizeof (struct tb_entry), phd->MAX_L, f) *
|
---|
860 | sizeof (struct tb_entry);
|
---|
861 |
|
---|
862 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
863 | for (j = 0; j < phd->MAX_L; ++j)
|
---|
864 | {
|
---|
865 | NTOHSL(phd->tb[i][j].tb0);
|
---|
866 | NTOHSL(phd->tb[i][j].tb1);
|
---|
867 | NTOHSL(phd->tb[i][j].tb2);
|
---|
868 | }
|
---|
869 | }
|
---|
870 | #endif
|
---|
871 | return (tot);
|
---|
872 | }
|
---|
873 |
|
---|
874 |
|
---|
875 | perf_hash_data *
|
---|
876 | read_perf_hash_data (FILE * f)
|
---|
877 | {
|
---|
878 | perf_hash_data *phd;
|
---|
879 | int i, tot, ok = 1;
|
---|
880 | if (!(phd = (perf_hash_data *)Xmalloc (sizeof (perf_hash_data))))
|
---|
881 | return (NULL);
|
---|
882 | tot = fread ((char *) &phd->MAX_L, sizeof (int), 1, f) * sizeof (int);
|
---|
883 | tot += fread ((char *) &phd->MAX_N, sizeof (int), 1, f) * sizeof (int);
|
---|
884 | tot += fread ((char *) &phd->MAX_M, sizeof (int), 1, f) * sizeof (int);
|
---|
885 | tot += fread ((char *) &phd->MAX_CH, sizeof (int), 1, f) * sizeof (int);
|
---|
886 |
|
---|
887 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
888 | NTOHSI(phd->MAX_L);
|
---|
889 | NTOHSI(phd->MAX_N);
|
---|
890 | NTOHSI(phd->MAX_M);
|
---|
891 | NTOHSI(phd->MAX_CH);
|
---|
892 |
|
---|
893 | if (tot != 4 * sizeof (int))
|
---|
894 | return (NULL);
|
---|
895 | phd->translate = (u_char *)Xmalloc (sizeof (u_char) * 256);
|
---|
896 | phd->g = (int *)Xmalloc (sizeof (int) * (phd->MAX_N + 1));
|
---|
897 | #ifndef STRUCT
|
---|
898 | phd->tb0 = Xmalloc (sizeof (int *) * phd->MAX_CH);
|
---|
899 | phd->tb1 = Xmalloc (sizeof (int *) * phd->MAX_CH);
|
---|
900 | phd->tb2 = Xmalloc (sizeof (int *) * phd->MAX_CH);
|
---|
901 | for (i = 0; i < phd->MAX_CH; ++i)
|
---|
902 | {
|
---|
903 | if (phd->tb0)
|
---|
904 | if (!(phd->tb0[i] = Xmalloc (sizeof (long) * phd->MAX_L)))
|
---|
905 | ok = 0;
|
---|
906 | if (phd->tb1)
|
---|
907 | if (!(phd->tb1[i] = Xmalloc (sizeof (long) * phd->MAX_L)))
|
---|
908 | ok = 0;
|
---|
909 | if (phd->tb2)
|
---|
910 | if (!(phd->tb2[i] = Xmalloc (sizeof (long) * phd->MAX_L)))
|
---|
911 | ok = 0;
|
---|
912 | }
|
---|
913 | if (!(phd->translate && phd->g && phd->tb0 && phd->tb1 && phd->tb2 && ok))
|
---|
914 | {
|
---|
915 | if (phd->translate)
|
---|
916 | Xfree (phd->translate);
|
---|
917 | if (phd->g)
|
---|
918 | Xfree (phd->g);
|
---|
919 | for (i = 0; i < MAX_CH; ++i)
|
---|
920 | {
|
---|
921 | if (phd->tb0 && phd->tb0[i])
|
---|
922 | Xfree (phd->tb0[i]);
|
---|
923 | if (phd->tb1 && phd->tb1[i])
|
---|
924 | Xfree (phd->tb1[i]);
|
---|
925 | if (phd->tb2 && phd->tb2[i])
|
---|
926 | Xfree (phd->tb2[i]);
|
---|
927 | }
|
---|
928 | if (phd->tb0)
|
---|
929 | Xfree (phd->tb0);
|
---|
930 | if (phd->tb1)
|
---|
931 | Xfree (phd->tb1);
|
---|
932 | if (phd->tb2)
|
---|
933 | Xfree (phd->tb2);
|
---|
934 | Xfree (phd);
|
---|
935 | return (NULL);
|
---|
936 | }
|
---|
937 | tot += fread ((char *) phd->translate, sizeof (u_char), 256, f);
|
---|
938 | tot += fread ((char *) phd->g, sizeof (int), phd->MAX_N + 1, f) * sizeof (int);
|
---|
939 |
|
---|
940 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
941 | for (i = 0; i < phd->MAX_N + 1; ++i)
|
---|
942 | NTOHSI(phd->g[i]);
|
---|
943 |
|
---|
944 | for (i = 0; i < phd->MAX_CH; ++i)
|
---|
945 | {
|
---|
946 | int j;
|
---|
947 |
|
---|
948 | tot += fread ((char *) phd->tb0[i], sizeof (long), phd->MAX_L, f) *
|
---|
949 | sizeof (int);
|
---|
950 | tot += fread ((char *) phd->tb1[i], sizeof (long), phd->MAX_L, f) *
|
---|
951 | sizeof (int);
|
---|
952 | tot += fread ((char *) phd->tb2[i], sizeof (long), phd->MAX_L, f) *
|
---|
953 | sizeof (int);
|
---|
954 |
|
---|
955 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
956 | for (j = 0; j < phd->MAX_L; ++j)
|
---|
957 | {
|
---|
958 | NTOHSI(phd->tb0[i][j]);
|
---|
959 | NTOHSI(phd->tb1[i][j]);
|
---|
960 | NTOHSI(phd->tb2[i][j]);
|
---|
961 | }
|
---|
962 | }
|
---|
963 | #else
|
---|
964 | phd->tb = (struct tb_entry **)Xmalloc (sizeof (struct tb_entry *) * phd->MAX_CH);
|
---|
965 | for (i = 0; i < phd->MAX_CH; ++i)
|
---|
966 | if (phd->tb)
|
---|
967 | if (!(phd->tb[i] = (struct tb_entry *)Xmalloc (sizeof (struct tb_entry) * phd->MAX_L)))
|
---|
968 | ok = 0;
|
---|
969 | if (!(phd->translate && phd->g && phd->tb && ok))
|
---|
970 | {
|
---|
971 | if (phd->translate)
|
---|
972 | Xfree (phd->translate);
|
---|
973 | if (phd->g)
|
---|
974 | Xfree (phd->g);
|
---|
975 | for (i = 0; i < MAX_CH; ++i)
|
---|
976 | if (phd->tb && phd->tb[i])
|
---|
977 | Xfree (phd->tb[i]);
|
---|
978 | if (phd->tb)
|
---|
979 | Xfree (phd->tb);
|
---|
980 | Xfree (phd);
|
---|
981 | return (NULL);
|
---|
982 | }
|
---|
983 | tot += fread ((char *) phd->translate, sizeof (u_char), 256, f);
|
---|
984 | tot += fread ((char *) phd->g, sizeof (int), phd->MAX_N + 1, f) * sizeof (int);
|
---|
985 |
|
---|
986 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
987 | for (i = 0; i < phd->MAX_N + 1; ++i)
|
---|
988 | NTOHSI(phd->g[i]);
|
---|
989 |
|
---|
990 | for (i = 0; i < phd->MAX_CH; ++i)
|
---|
991 | {
|
---|
992 | int j;
|
---|
993 |
|
---|
994 | tot += fread ((char *) phd->tb[i], sizeof (struct tb_entry), phd->MAX_L, f) *
|
---|
995 | sizeof (struct tb_entry);
|
---|
996 |
|
---|
997 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
998 | for (j = 0; j < phd->MAX_L; ++j)
|
---|
999 | {
|
---|
1000 | NTOHSL(phd->tb[i][j].tb0);
|
---|
1001 | NTOHSL(phd->tb[i][j].tb1);
|
---|
1002 | NTOHSL(phd->tb[i][j].tb2);
|
---|
1003 | }
|
---|
1004 | }
|
---|
1005 | #endif
|
---|
1006 | return (phd);
|
---|
1007 | }
|
---|
1008 |
|
---|
1009 | void
|
---|
1010 | free_perf_hash (perf_hash_data * phd)
|
---|
1011 | {
|
---|
1012 | int i;
|
---|
1013 | if (phd->translate)
|
---|
1014 | Xfree (phd->translate);
|
---|
1015 | if (phd->g)
|
---|
1016 | Xfree (phd->g);
|
---|
1017 | for (i = 0; i < phd->MAX_CH; ++i)
|
---|
1018 | if (phd->tb && phd->tb[i])
|
---|
1019 | Xfree (phd->tb[i]);
|
---|
1020 | if (phd->tb)
|
---|
1021 | Xfree (phd->tb);
|
---|
1022 | Xfree (phd);
|
---|
1023 | }
|
---|
1024 |
|
---|
1025 |
|
---|
1026 | int
|
---|
1027 | perf_hash (perf_hash_data * phd, u_char * s)
|
---|
1028 | {
|
---|
1029 | int u, v, w, i, l;
|
---|
1030 | l = *s++;
|
---|
1031 | i = (l - 1) % phd->MAX_L;
|
---|
1032 | u = v = w = 0;
|
---|
1033 | while (l)
|
---|
1034 | {
|
---|
1035 | #ifndef STRUCT
|
---|
1036 | if ((u += phd->tb0[phd->translate[*s]][i]) >= phd->MAX_N)
|
---|
1037 | u -= phd->MAX_N;
|
---|
1038 | if ((v += phd->tb1[phd->translate[*s]][i]) >= phd->MAX_N)
|
---|
1039 | v -= phd->MAX_N;
|
---|
1040 | if ((w += phd->tb2[phd->translate[*s]][i]) >= phd->MAX_N)
|
---|
1041 | w -= phd->MAX_N;
|
---|
1042 | #else
|
---|
1043 | struct tb_entry *tbp = &phd->tb[phd->translate[*s]][i];
|
---|
1044 | if ((u += tbp->tb0) >= phd->MAX_N)
|
---|
1045 | u -= phd->MAX_N;
|
---|
1046 | if ((v += tbp->tb1) >= phd->MAX_N)
|
---|
1047 | v -= phd->MAX_N;
|
---|
1048 | if ((w += tbp->tb2) >= phd->MAX_N)
|
---|
1049 | w -= phd->MAX_N;
|
---|
1050 | #endif
|
---|
1051 | if (++i >= phd->MAX_L)
|
---|
1052 | i = 0;
|
---|
1053 | --l;
|
---|
1054 | ++s;
|
---|
1055 | }
|
---|
1056 | if (u == v && ++v >= phd->MAX_N)
|
---|
1057 | v = 0;
|
---|
1058 | if (w == v)
|
---|
1059 | {
|
---|
1060 | if (++w >= phd->MAX_N)
|
---|
1061 | w = 0;
|
---|
1062 | if (w == u && ++w >= phd->MAX_N)
|
---|
1063 | w = 0;
|
---|
1064 | }
|
---|
1065 | else if (w == u)
|
---|
1066 | {
|
---|
1067 | if (++w >= phd->MAX_N)
|
---|
1068 | w = 0;
|
---|
1069 | if (w == v && ++w >= phd->MAX_N)
|
---|
1070 | w = 0;
|
---|
1071 | }
|
---|
1072 | return ((phd->g[u] ^ phd->g[v] ^ phd->g[w]) > phd->MAX_M) ? 0 :
|
---|
1073 | (phd->g[u] ^ phd->g[v] ^ phd->g[w]);
|
---|
1074 | }
|
---|