[3365] | 1 | /**************************************************************************
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| 2 | *
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| 3 | * IndexData.cpp -- Information needed for querying
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| 4 | * Copyright (C) 1999 Rodger McNab
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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 | #include "IndexData.h"
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| 23 | #include "string.h"
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| 24 | #include "mg_files.h"
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| 25 |
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| 26 | IndexData::IndexData () {
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| 27 | basePath[0] = '\0';
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| 28 | filename[0] = '\0';
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| 29 |
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| 30 | dictFile = NULL;
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| 31 |
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| 32 | stem1File = NULL;
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| 33 | stem2File = NULL;
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| 34 | stem3File = NULL;
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| 35 |
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| 36 | invfFile = NULL;
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| 37 |
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| 38 | approxWeightsFile = NULL;
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| 39 | exactWeightsFile = NULL;
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| 40 |
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| 41 | curLevelNum = 0;
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| 42 | }
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| 43 |
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| 44 | IndexData::~IndexData () {
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| 45 | UnloadData ();
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| 46 | }
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| 47 |
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| 48 | bool IndexData::LoadData (const char *_basePath, const char *_filename) {
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| 49 | if (_filename[0] == '\0') return false;
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| 50 |
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| 51 | // make sure this data has not already been loaded
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| 52 | if (strcmp (_basePath, basePath) == 0 &&
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| 53 | strcmp (_filename, filename) == 0) return true;
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| 54 |
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| 55 | // make sure there is nothing else loaded
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| 56 | UnloadData ();
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| 57 |
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| 58 | strcpy (basePath, _basePath);
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| 59 | strcpy (filename, _filename);
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| 60 |
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| 61 | set_basepath (basePath);
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| 62 |
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| 63 | // load in the level information
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| 64 | FILE *ivfLevelFile;
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| 65 | ivfLevelFile = open_file (filename, INVF_LEVEL_SUFFIX, "rb",
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| 66 | MAGIC_INVF_LEVELS, MG_ABORT);
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| 67 | levels.Read (ivfLevelFile);
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| 68 | fclose (ivfLevelFile);
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| 69 |
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| 70 | // blocked dictionary
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| 71 | dictFile = open_file (filename, INVF_DICT_BLOCKED_SUFFIX, "rb",
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| 72 | MAGIC_STEM, MG_ABORT);
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| 73 | if (!bdh.Read (dictFile)) { UnloadData (); return false; }
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| 74 |
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| 75 | fseek (dictFile, bdh.wblk_idx_start, SEEK_SET);
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| 76 | if (!ReadBlockIdx (dictFile, biWords)) { UnloadData (); return false; }
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| 77 |
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| 78 | fseek (dictFile, bdh.tblk_idx_start, SEEK_SET);
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| 79 | if (!ReadBlockIdx (dictFile, biTags)) { UnloadData (); return false; }
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| 80 |
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| 81 | // blocked stem index 1
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| 82 | stem1File = open_file (filename, INVF_DICT_BLOCKED_1_SUFFIX,
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| 83 | "rb", MAGIC_STEM_1, MG_ABORT);
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| 84 | if (!sih1.Read (stem1File)) { UnloadData (); return false; }
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| 85 |
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| 86 | fseek (stem1File, sih1.block_idx_start, SEEK_SET);
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| 87 | if (!ReadBlockIdx (stem1File, sii1)) { UnloadData (); return false; }
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| 88 |
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| 89 | // blocked stem index 2
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| 90 | stem2File = open_file (filename, INVF_DICT_BLOCKED_2_SUFFIX,
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| 91 | "rb", MAGIC_STEM_2, MG_ABORT);
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| 92 | if (!sih2.Read (stem2File)) { UnloadData (); return false; }
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| 93 |
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| 94 | fseek (stem2File, sih2.block_idx_start, SEEK_SET);
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| 95 | if (!ReadBlockIdx (stem2File, sii2)) { UnloadData (); return false; }
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| 96 |
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| 97 | // blocked stem index 3
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| 98 | stem3File = open_file (filename, INVF_DICT_BLOCKED_3_SUFFIX,
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| 99 | "rb", MAGIC_STEM_3, MG_ABORT);
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| 100 | if (!sih3.Read (stem3File)) { UnloadData (); return false; }
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| 101 |
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| 102 | fseek (stem3File, sih3.block_idx_start, SEEK_SET);
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| 103 | if (!ReadBlockIdx (stem3File, sii3)) { UnloadData (); return false; }
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| 104 |
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| 105 | // inverted file
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| 106 | invfFile = open_file (filename, INVF_SUFFIX, "rb",
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| 107 | MAGIC_INVF, MG_ABORT);
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| 108 | ifh.Read (invfFile);
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| 109 |
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| 110 | // weights
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| 111 | approxWeightsFile = open_file (filename, APPROX_WEIGHTS_SUFFIX, "rb",
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| 112 | MAGIC_WGHT_APPROX, MG_ABORT);
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| 113 | exactWeightsFile = open_file (filename, WEIGHTS_SUFFIX, "rb",
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| 114 | MAGIC_WGHT, MG_ABORT);
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| 115 |
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| 116 | return true;
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| 117 | }
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| 118 |
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| 119 | bool IndexData::UnloadData () {
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| 120 | basePath[0] = '\0';
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| 121 | filename[0] = '\0';
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| 122 |
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| 123 | if (dictFile != NULL) {
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| 124 | fclose (dictFile); dictFile = NULL;
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| 125 | }
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| 126 |
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| 127 | if (stem1File != NULL) {
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| 128 | fclose (stem1File); stem1File = NULL;
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| 129 | }
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| 130 | if (stem2File != NULL) {
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| 131 | fclose (stem2File); stem2File = NULL;
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| 132 | }
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| 133 | if (stem3File != NULL) {
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| 134 | fclose (stem3File); stem3File = NULL;
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| 135 | }
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| 136 |
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| 137 | if (invfFile != NULL) {
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| 138 | fclose (invfFile); invfFile = NULL;
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| 139 | }
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| 140 |
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| 141 | if (approxWeightsFile != NULL) {
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| 142 | fclose (approxWeightsFile); approxWeightsFile = NULL;
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| 143 | }
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| 144 | if (exactWeightsFile != NULL) {
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| 145 | fclose (exactWeightsFile); exactWeightsFile = NULL;
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| 146 | }
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| 147 |
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| 148 | UnloadLevel();
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| 149 |
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| 150 | return true;
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| 151 | }
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| 152 |
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| 153 |
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| 154 | bool IndexData::LoadLevel (const UCArray &level) {
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| 155 | // make sure this level is not already loaded
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| 156 | if (level == curLevel) return true;
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| 157 |
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| 158 | // unload any levels currently loaded
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| 159 | UnloadLevel();
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| 160 |
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| 161 | // make sure the required files are open
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| 162 | if (dictFile == NULL || invfFile == NULL ||
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| 163 | approxWeightsFile == NULL || exactWeightsFile == NULL)
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| 164 | return false;
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| 165 |
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| 166 | // read in the information from the dictionary
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| 167 | block_dict_el tagEl;
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| 168 | unsigned long tagElNum;
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| 169 | if (!SearchBlockDictEl (dictFile, biTags, bdh.entries_per_tblk,
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| 170 | bdh.tag_dict_size, level, tagEl, tagElNum))
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| 171 | return false;
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| 172 |
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| 173 | // read in the level conversion information
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| 174 | if (!levelConverter.Read (invfFile, tagEl.invf_ptr,
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| 175 | bdh.num_frags, tagEl.frag_occur))
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| 176 | return false;
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| 177 |
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| 178 | // read in the approximate weights
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| 179 | if (!weightData.Read (approxWeightsFile,
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| 180 | levels.levelInfo[level].approxWeightsDiskPtr,
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| 181 | levels.levelInfo[level].numEntries))
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| 182 | return false;
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| 183 |
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| 184 | // find the level number
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| 185 | curLevelNum = 0;
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| 186 | IvfLevelInfoMap::const_iterator levelHere, levelEnd;
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| 187 | for (levelHere=levels.levelInfo.begin(), levelEnd=levels.levelInfo.end();
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| 188 | levelHere!=levelEnd && (*levelHere).first != level; levelHere++)
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| 189 | curLevelNum++;
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| 190 |
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| 191 | // make sure we found the level
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| 192 | if (levelHere == levelEnd) return false;
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| 193 |
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| 194 | curLevel = level;
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| 195 |
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| 196 | return true;
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| 197 | }
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| 198 |
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| 199 | bool IndexData::UnloadLevel () {
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| 200 | curLevel.erase (curLevel.begin(), curLevel.end());
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| 201 | curLevelNum = 0;
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| 202 |
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| 203 | weightData.Free ();
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| 204 |
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| 205 | return true;
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| 206 | }
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| 207 |
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