1 | /**************************************************************************
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2 | *
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3 | * text.pass1.cpp -- Text compression (Pass 1)
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4 | * Copyright (C) 1994 Neil Sharman, Gary Eddy and Alistair Moffat
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5 | * Copyright (C) 1999 Rodger McNab
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6 | *
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7 | * This program is free software; you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation; either version 2 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * This program is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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20 | *
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21 | * $Id: text.pass1.cpp 856 2000-01-14 02:26:25Z sjboddie $
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22 | *
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23 | **************************************************************************/
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24 |
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25 | #include "sysfuncs.h"
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26 |
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27 | #include "memlib.h"
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28 | #include "messages.h"
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29 | #include "huffman.h"
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30 | #include "netorder.h" /* [RPAP - Jan 97: Endian Ordering] */
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31 |
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32 |
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33 | #include "mg_files.h"
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34 | #include "mg.h"
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35 | #include "build.h"
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36 | #include "locallib.h"
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37 | #include "words.h"
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38 | #include "text.h"
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39 | #include "hash.h"
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40 | #include "local_strings.h"
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41 |
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42 | #include "TextEl.h"
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43 |
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44 |
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45 | /*
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46 | $Log$
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47 | Revision 1.1 2000/01/14 02:26:23 sjboddie
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48 | Rodgers new C++ mg
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49 |
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50 | Revision 1.1 1999/10/11 02:58:37 cs025
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51 | Base install of MG-PP
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52 |
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53 | Revision 1.1 1999/08/10 21:18:25 sjboddie
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54 | renamed mg-1.3d directory mg
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55 |
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56 | Revision 1.2 1998/12/17 09:12:54 rjmcnab
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57 |
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58 | Altered mg to process utf-8 encoded Unicode. The main changes
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59 | are in the parsing of the input, the casefolding, and the stemming.
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60 |
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61 | Revision 1.1 1998/11/17 09:35:46 rjmcnab
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62 | *** empty log message ***
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63 |
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64 | * Revision 1.4 1994/11/25 03:47:47 tes
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65 | * Committing files before adding the merge stuff.
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66 | *
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67 | * Revision 1.3 1994/10/20 03:57:09 tes
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68 | * I have rewritten the boolean query optimiser and abstracted out the
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69 | * components of the boolean query.
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70 | *
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71 | * Revision 1.2 1994/09/20 04:42:13 tes
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72 | * For version 1.1
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73 | *
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74 | */
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75 |
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76 |
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77 | #define POOL_SIZE 1024*1024
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78 | #define INITIAL_HASH_SIZE 7927
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79 |
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80 |
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81 |
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82 |
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83 |
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84 |
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85 |
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86 | typedef struct hash_rec
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87 | {
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88 | unsigned long wcnt; /* word frequency */
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89 | unsigned long occurance_num;
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90 | u_char *word;
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91 | }
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92 | hash_rec;
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93 |
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94 | typedef struct dict_data
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95 | {
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96 | hash_rec *HashTable;
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97 | unsigned long HashSize;
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98 | unsigned long HashUsed;
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99 | unsigned long wordnum;
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100 | unsigned long words_read;
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101 | unsigned long bytes_diff;
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102 | huff_data hd;
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103 | }
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104 | dict_data;
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105 |
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106 |
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107 |
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108 | static unsigned long longestDoc = 0;
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109 | static unsigned long occurance_num = 0;
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110 | static dict_data DictData[2];
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111 |
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112 | static u_char *Pool;
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113 | static int PoolLeft;
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114 | static double inputbytes = 0; /* [RJM 07/97: 4G limit] */
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115 | static unsigned long MaxMemInUse = 0;
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116 | static unsigned long MemInUse = 0;
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117 | static compression_stats_header csh = {0, 0, 0.0}; /* [RJM 07/97: 4G limit] */
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118 |
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119 |
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120 | static void ChangeMem (int Change) {
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121 | MemInUse += Change;
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122 | if (MemInUse > MaxMemInUse) MaxMemInUse = MemInUse;
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123 | }
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124 |
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125 |
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126 | int init_text_1 (const TagInfo &/*tagInfo*/, char * /*FileName*/) {
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127 | int which;
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128 |
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129 | if (!(Pool = (u_char *) Xmalloc (POOL_SIZE))) {
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130 | Message ("Unable to allocate memory for pool");
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131 | return (COMPERROR);
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132 | }
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133 | PoolLeft = POOL_SIZE;
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134 | ChangeMem (POOL_SIZE);
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135 |
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136 | for (which = 1; which >= 0; which--) {
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137 | u_char *word;
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138 | hash_rec *ent;
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139 | dict_data *dd = &DictData[which];
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140 |
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141 | dd->wordnum = 0;
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142 | dd->words_read = 0;
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143 | dd->bytes_diff = 0;
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144 | dd->HashSize = INITIAL_HASH_SIZE;
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145 | dd->HashUsed = 0;
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146 |
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147 | if (!(dd->HashTable = (hash_rec *) Xmalloc (sizeof (hash_rec) * dd->HashSize))) {
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148 | Message ("Unable to allocate memory for table");
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149 | return (COMPERROR);
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150 | }
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151 | ChangeMem (sizeof (hash_rec) * dd->HashSize);
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152 | bzero ((char *) (dd->HashTable), sizeof (hash_rec) * dd->HashSize);
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153 |
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154 | word = Pool;
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155 | *Pool++ = '\0';
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156 | PoolLeft--;
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157 | {
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158 | register u_char *wptr;
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159 | register int hsize = dd->HashSize;
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160 | register unsigned long hashval, step;
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161 |
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162 | HASH (hashval, step, word, hsize);
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163 | wptr = (dd->HashTable + hashval)->word;
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164 | while (wptr) {
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165 | hashval += step;
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166 | if (hashval >= (unsigned long)hsize)
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167 | hashval -= hsize;
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168 | wptr = (dd->HashTable + hashval)->word;
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169 | }
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170 | ent = dd->HashTable + hashval;
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171 | }
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172 | ent->wcnt = 1;
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173 | ent->word = word;
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174 | dd->HashUsed = 1;
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175 | }
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176 | return (COMPALLOK);
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177 | }
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178 |
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179 |
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180 | static int process_text_element (const u_char *s_in, int l_in) {
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181 | const u_char *end = s_in + l_in - 1;
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182 |
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183 | /*
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184 | ** Alternately parse off words and non-words from the input
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185 | ** stream beginning with a non-word. Each token is then
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186 | ** inserted into the set if it does not exist or has it's
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187 | ** frequency count incremented if it does.
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188 | */
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189 |
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190 | bool which = false; // non-word
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191 | for (; s_in <= end; which = !which) {
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192 | u_char Word[MAXWORDLEN + 1];
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193 | dict_data *dd = &DictData[which];
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194 |
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195 | /* First parse a word or non-word out of the string */
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196 | if (which) PARSE_WORD (Word, s_in, end);
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197 | else PARSE_NON_WORD (Word, s_in, end);
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198 |
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199 | dd->wordnum++;
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200 | inputbytes += *Word;
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201 | dd->words_read++;
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202 |
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203 | /* Search the hash table for Word */
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204 | {
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205 | register unsigned long hashval, step;
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206 | register int hsize = dd->HashSize;
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207 | HASH (hashval, step, Word, hsize);
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208 | for (;;) {
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209 | register u_char *s1;
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210 | register u_char *s2;
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211 | register int len;
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212 | register hash_rec *ent;
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213 | ent = dd->HashTable + hashval;
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214 | if (!ent->word) {
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215 | int len = *Word + 1;
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216 | if (len > PoolLeft) {
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217 | if (!(Pool = (u_char *) Xmalloc (POOL_SIZE))) {
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218 | Message ("Unable to allocate memory for pool");
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219 | return (COMPERROR);
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220 | }
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221 | PoolLeft = POOL_SIZE;
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222 | ChangeMem (POOL_SIZE);
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223 | }
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224 | ent->occurance_num = occurance_num++;
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225 | ent->wcnt = 1;
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226 | ent->word = Pool;
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227 | memcpy (Pool, Word, len);
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228 | Pool += len;
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229 | PoolLeft -= len;
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230 | dd->HashUsed++;
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231 | dd->bytes_diff += Word[0];
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232 | break;
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233 | }
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234 |
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235 | /* Compare the words */
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236 | s1 = Word;
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237 | s2 = ent->word;
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238 | len = *s1 + 1;
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239 | for (; len; len--)
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240 | if (*s1++ != *s2++) break;
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241 |
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242 | if (len) {
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243 | hashval = (hashval + step);
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244 | if (hashval >= (unsigned long)hsize) hashval -= hsize;
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245 | } else {
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246 | ent->wcnt++;
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247 | break;
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248 | }
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249 | }
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250 | }
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251 |
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252 |
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253 | if (dd->HashUsed >= dd->HashSize >> 1) {
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254 | hash_rec *ht;
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255 | unsigned long size;
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256 | unsigned long i;
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257 | size = prime (dd->HashSize * 2);
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258 | if (!(ht = (hash_rec *) Xmalloc (sizeof (hash_rec) * size))) {
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259 | Message ("Unable to allocate memory for table");
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260 | return (COMPERROR);
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261 | }
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262 | ChangeMem (sizeof (hash_rec) * size);
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263 | bzero ((char *) ht, sizeof (hash_rec) * size);
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264 |
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265 | for (i = 0; i < dd->HashSize; i++)
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266 | if (dd->HashTable[i].word) {
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267 | register u_char *wptr;
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268 | register unsigned long hashval, step;
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269 |
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270 | wptr = dd->HashTable[i].word;
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271 | HASH (hashval, step, wptr, size);
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272 | wptr = (ht + hashval)->word;
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273 | while (wptr) {
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274 | hashval += step;
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275 | if (hashval >= size) hashval -= size;
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276 | wptr = (ht + hashval)->word;
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277 | }
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278 | ht[hashval] = dd->HashTable[i];
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279 | }
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280 | Xfree (dd->HashTable);
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281 | ChangeMem (-sizeof (hash_rec) * dd->HashSize);
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282 | dd->HashTable = ht;
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283 | dd->HashSize = size;
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284 | }
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285 | }
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286 |
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287 | return COMPALLOK;
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288 | }
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289 |
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290 |
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291 | int process_text_1 (const TagInfo &/*tagInfo*/, const TextElArray &doc) {
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292 | unsigned long textLen = 0;
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293 | unsigned long docLen = 0;
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294 | int retValue;
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295 |
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296 | // process each text element in this document
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297 | TextElArray::const_iterator here = doc.begin();
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298 | TextElArray::const_iterator end = doc.end();
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299 | while (here != end) {
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300 | textLen = (*here).text.size();
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301 | docLen += textLen;
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302 |
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303 | retValue = process_text_element ((*here).text.begin(), textLen);
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304 | if (retValue != COMPALLOK) return retValue;
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305 |
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306 | here++;
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307 | }
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308 |
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309 | // get max document length
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310 | if (docLen > longestDoc) longestDoc = docLen;
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311 |
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312 | // update header information
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313 | csh.num_docs++;
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314 | csh.num_bytes += docLen;
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315 |
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316 | return COMPALLOK;
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317 | }
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318 |
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319 |
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320 | static int PackHashTable (dict_data * dd) {
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321 | int s, d;
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322 | for (s = d = 0; (unsigned int)s < dd->HashSize; s++)
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323 | if (dd->HashTable[s].word)
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324 | dd->HashTable[d++] = dd->HashTable[s];
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325 |
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326 | ChangeMem (-sizeof (hash_rec) * dd->HashSize);
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327 | ChangeMem (sizeof (hash_rec) * dd->HashUsed);
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328 |
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329 | if (!(dd->HashTable = (hash_rec *) Xrealloc (dd->HashTable,
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330 | sizeof (hash_rec) * dd->HashUsed))) {
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331 | Message ("Out of memory");
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332 | return COMPERROR;
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333 | }
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334 | dd->HashSize = dd->HashUsed;
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335 | return COMPALLOK;
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336 | }
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337 |
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338 |
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339 | static int ent_comp (const void *s1, const void *s2) {
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340 | return casecompare (((hash_rec *) s1)->word, ((hash_rec *) s2)->word);
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341 | }
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342 |
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343 |
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344 | static void WriteHashTable (FILE * fp, dict_data * dd) {
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345 | frags_stats_header fsh;
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346 | u_long j = 0;
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347 | u_char *curr;
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348 |
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349 | if (PackHashTable (dd) == COMPERROR) return;
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350 |
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351 | qsort (dd->HashTable, dd->HashUsed, sizeof (hash_rec), ent_comp);
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352 |
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353 | fsh.num_frags = dd->HashSize;
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354 | fsh.mem_for_frags = dd->HashSize;
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355 | for (j = 0; j < dd->HashSize; j++)
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356 | fsh.mem_for_frags += dd->HashTable[j].word[0];
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357 |
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358 | /* [RPAP - Jan 97: Endian Ordering] */
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359 | HTONUL(fsh.num_frags);
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360 | HTONUL(fsh.mem_for_frags);
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361 |
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362 | fwrite (&fsh, sizeof (fsh), 1, fp);
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363 |
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364 | for (j = 0; j < dd->HashSize; j++) {
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365 | curr = dd->HashTable[j].word;
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366 |
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367 | /* [RPAP - Jan 97: Endian Ordering] */
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368 | HTONUL(dd->HashTable[j].wcnt);
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369 | HTONUL(dd->HashTable[j].occurance_num);
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370 |
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371 | fwrite (&dd->HashTable[j].wcnt, sizeof (dd->HashTable[j].wcnt), 1, fp);
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372 | fwrite (&dd->HashTable[j].occurance_num,
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373 | sizeof (dd->HashTable[j].occurance_num), 1, fp);
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374 |
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375 | /* [RPAP - Jan 97: Endian Ordering] */
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376 | NTOHUL(dd->HashTable[j].wcnt);
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377 | NTOHUL(dd->HashTable[j].occurance_num);
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378 |
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379 | fwrite (curr, sizeof (u_char), curr[0] + 1, fp);
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380 | }
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381 | }
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382 |
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383 |
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384 | int done_text_1 (const TagInfo &/*tagInfo*/, char *file_name) {
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385 | char *temp_str;
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386 | FILE *fp;
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387 |
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388 | if (!(fp = create_file (file_name, TEXT_STATS_DICT_SUFFIX, "wb",
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389 | MAGIC_STATS_DICT, MG_MESSAGE))) /* [RPAP - Feb 97: WIN32 Port] */
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390 | return COMPERROR;
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391 |
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392 | temp_str = msg_prefix;
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393 | msg_prefix = "text.pass1";
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394 |
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395 | /* [RPAP - Jan 97: Endian Ordering] */
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396 | HTONUL(csh.num_docs);
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397 | HTOND(csh.num_bytes); /* [RJM 07/97: 4G limit] */
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398 |
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399 | fwrite (&csh, sizeof (csh), 1, fp);
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400 |
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401 | /* [RPAP - Jan 97: Endian Ordering] */
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402 | NTOHUL(csh.num_docs);
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403 | NTOHD(csh.num_bytes); /* [RJM 07/97: 4G limit] */
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404 |
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405 | WriteHashTable (fp, &DictData[0]);
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406 | WriteHashTable (fp, &DictData[1]);
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407 | msg_prefix = temp_str;
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408 | return COMPALLOK;
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409 | }
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