1 | /**************************************************************************
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2 | *
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3 | * mg_perf_hash_build.c -- Program to build a perfect hash function
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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: mg_perf_hash_build.c 16583 2008-07-29 10:20:36Z davidb $
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21 | *
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22 | **************************************************************************/
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23 |
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24 | #include "sysfuncs.h"
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25 | #include "memlib.h"
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26 | #include "messages.h"
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27 | #include "timing.h"
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28 | #include "local_strings.h"
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29 | #include "perf_hash.h"
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30 | #include "netorder.h" /* [RPAP - Jan 97: Endian Ordering] */
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31 |
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32 | #include "mg_files.h"
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33 | #include "invf.h"
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34 | #include "locallib.h"
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35 | #include "words.h"
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36 | #include "mg.h"
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37 |
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38 | /*
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39 | $Log$
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40 | Revision 1.1 2003/02/20 21:18:24 mdewsnip
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41 | Addition of MG package for search and retrieval
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42 |
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43 | Revision 1.1 1999/08/10 21:18:13 sjboddie
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44 | renamed mg-1.3d directory mg
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45 |
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46 | Revision 1.2 1998/11/25 07:55:47 rjmcnab
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47 |
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48 | Modified mg to that you can specify the stemmer you want
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49 | to use via a command line option. You specify it to
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50 | mg_passes during the build process. The number of the
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51 | stemmer that you used is stored within the inverted
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52 | dictionary header and the stemmed dictionary header so
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53 | the correct stemmer is used in later stages of building
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54 | and querying.
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55 |
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56 | Revision 1.1 1998/11/17 09:35:15 rjmcnab
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57 | *** empty log message ***
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58 |
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59 | * Revision 1.3 1994/10/20 03:56:58 tes
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60 | * I have rewritten the boolean query optimiser and abstracted out the
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61 | * components of the boolean query.
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62 | *
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63 | * Revision 1.2 1994/09/20 04:41:53 tes
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64 | * For version 1.1
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65 | *
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66 | */
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67 |
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68 | static char *RCSID = "$Id: mg_perf_hash_build.c 16583 2008-07-29 10:20:36Z davidb $";
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69 |
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70 |
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71 |
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72 | #define POOL_SIZE 1024*1024
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73 |
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74 | static void process_files (char *filename);
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75 |
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76 | int r = -1;
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77 |
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78 | int main (int argc, char **argv)
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79 | {
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80 | ProgTime start;
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81 | char *file_name = "";
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82 | int ch;
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83 | msg_prefix = argv[0];
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84 | opterr = 0;
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85 | while ((ch = getopt (argc, argv, "f:d:r:h")) != -1)
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86 | switch (ch)
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87 | {
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88 | case 'f': /* input file */
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89 | file_name = optarg;
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90 | break;
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91 | case 'd':
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92 | set_basepath (optarg);
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93 | break;
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94 | case 'r':
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95 | r = atoi (optarg);
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96 | break;
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97 | case 'h':
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98 | case '?':
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99 | fprintf (stderr, "usage: %s [-f input_file]"
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100 | "[-d data directory] [-r random seed] [-h]\n", argv[0]);
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101 | exit (1);
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102 | }
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103 |
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104 | GetTime (&start);
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105 | process_files (file_name);
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106 | Message ("%s\n", ElapsedTime (&start, NULL));
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107 | return 0;
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108 | }
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109 |
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110 |
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111 |
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112 |
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113 |
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114 | static void
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115 | process_files (char *filename)
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116 | {
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117 | FILE *dict, *hash;
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118 | unsigned long i;
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119 | u_char prev[MAXSTEMLEN + 1];
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120 | struct invf_dict_header idh;
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121 | perf_hash_data *phd;
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122 | u_char *pool;
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123 | int pool_left;
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124 | u_char **starts;
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125 |
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126 |
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127 | dict = open_file (filename, INVF_DICT_SUFFIX, "rb",
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128 | MAGIC_STEM_BUILD, MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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129 |
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130 | fread ((char *) &idh, sizeof (idh), 1, dict);
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131 |
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132 | /* [RPAP - Jan 97: Endian Ordering] */
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133 | NTOHUL(idh.lookback);
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134 | NTOHUL(idh.dict_size);
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135 | NTOHUL(idh.total_bytes);
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136 | NTOHUL(idh.index_string_bytes);
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137 | NTOHD(idh.input_bytes); /* [RJM 07/97: 4G limit] */
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138 | NTOHUL(idh.num_of_docs);
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139 | NTOHUL(idh.static_num_of_docs);
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140 | NTOHUL(idh.num_of_words);
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141 | NTOHUL(idh.stemmer_num);
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142 | NTOHUL(idh.stem_method);
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143 |
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144 | hash = create_file (filename, INVF_DICT_HASH_SUFFIX, "wb",
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145 | MAGIC_HASH, MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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146 |
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147 | if (!(pool = Xmalloc (POOL_SIZE)))
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148 | FatalError (1, "Out of memory");
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149 | pool_left = POOL_SIZE;
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150 |
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151 | if (!(starts = Xmalloc (sizeof (u_char *) * idh.dict_size)))
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152 | FatalError (1, "Out of memory");
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153 |
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154 | for (i = 0; i < idh.dict_size; i++)
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155 | {
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156 | register unsigned long copy, suff, l;
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157 | unsigned long wcnt, fcnt;
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158 |
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159 | /* build a new word on top of prev */
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160 | copy = getc (dict);
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161 | suff = getc (dict);
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162 | *prev = copy + suff;
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163 | fread (prev + copy + 1, sizeof (u_char), suff, dict);
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164 |
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165 | /* read other data, but no need to store it */
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166 | fread (&fcnt, sizeof (fcnt), 1, dict);
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167 | fread (&wcnt, sizeof (wcnt), 1, dict);
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168 |
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169 | l = *prev + 1;
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170 | if (pool_left < l)
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171 | {
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172 | pool = Xmalloc (POOL_SIZE);
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173 | pool_left = POOL_SIZE;
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174 | }
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175 | starts[i] = pool;
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176 | bcopy ((char *) prev, (char *) pool, l);
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177 | pool += l;
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178 | pool_left -= l;
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179 | }
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180 | if (!(phd = gen_hash_func (idh.dict_size, starts, r)))
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181 | FatalError (1, "Unable to generate hash function");
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182 | if (write_perf_hash_data (hash, phd) == -1)
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183 | FatalError (1, "Unable to write hash function");
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184 | fclose (dict);
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185 | fclose (hash);
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186 | }
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