1 | /**********************************************************************
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2 | *
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3 | * gdbmclass.cpp --
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4 | * Copyright (C) 1999-2008 The New Zealand Digital Library Project
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5 | *
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6 | * A component of the Greenstone digital library software
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7 | * from the New Zealand Digital Library Project at the
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8 | * University of Waikato, New Zealand.
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9 | *
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10 | * This program is free software; you can redistribute it and/or modify
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11 | * it under the terms of the GNU General Public License as published by
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12 | * the Free Software Foundation; either version 2 of the License, or
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13 | * (at your option) any later version.
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14 | *
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15 | * This program is distributed in the hope that it will be useful,
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | * GNU General Public License for more details.
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19 | *
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20 | * You should have received a copy of the GNU General Public License
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21 | * along with this program; if not, write to the Free Software
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22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | *
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24 | *********************************************************************/
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25 |
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26 | #include "gdbmclass.h"
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27 | #include "gsdltools.h"
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28 | #include "gsdlunicode.h"
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29 | #include "fileutil.h"
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30 |
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31 |
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32 |
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33 |
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34 | gdbmclass::~gdbmclass()
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35 | {
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36 | closedatabase();
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37 | }
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38 |
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39 |
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40 | // returns true if opened
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41 | bool gdbmclass::opendatabase (const text_t &filename, int mode, int num_retrys,
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42 | #ifdef __WIN32__
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43 | bool need_filelock
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44 | #else
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45 | bool
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46 | #endif
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47 | )
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48 | {
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49 |
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50 | text_t data_location;
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51 | int block_size = 512;
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52 |
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53 | if (gdbmfile != NULL) {
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54 | if (openfile == filename) return true;
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55 | else closedatabase ();
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56 | }
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57 |
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58 | openfile = filename;
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59 |
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60 | // Map the DB mode values into GDBM mode values
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61 | int gdbm_mode = GDBM_READER;
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62 | if (mode == DB_WRITER)
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63 | {
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64 | gdbm_mode = GDBM_WRITER;
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65 | }
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66 | else if (mode == DB_WRITER_CREATE)
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67 | {
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68 | gdbm_mode = GDBM_WRCREAT;
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69 | }
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70 |
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71 | if (gdbm_mode == GDBM_READER) {
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72 | // Looking to read in the database
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73 | // => check to see if .ldb/.bdb file already there
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74 | // if not (first time) then generate using txt2db
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75 | if (!file_exists(filename)) {
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76 |
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77 | // need to generate architecture native GDBM file using txt2db
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78 |
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79 | // replace sought after gdbm filename ext with ".txt.gz"
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80 |
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81 | text_t::const_iterator begin = filename.begin();
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82 | text_t::const_iterator end= filename.end();
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83 | text_t::const_iterator here = end;
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84 |
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85 | bool found_ext = false;
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86 |
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87 | while (here != begin) {
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88 | if (*here == '.') {
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89 | found_ext = true;
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90 | break;
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91 | }
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92 | here--;
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93 | }
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94 |
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95 | text_t filename_root;
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96 |
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97 | if (found_ext) {
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98 | filename_root = substr(begin,here);
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99 | }
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100 | else {
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101 | filename_root = filename;
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102 | }
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103 |
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104 | text_t txtgz_filename = filename_root + ".txt.gz";
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105 | if (file_exists(txtgz_filename))
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106 | {
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107 | text_t cmd = "gzip --decompress --to-stdout \"" + txtgz_filename + "\"";
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108 | cmd += " | txt2db \"" + filename + "\"";
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109 |
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110 | int rv = gsdl_system(cmd, true, cerr);
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111 | if (rv != 0) {
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112 | cerr << "Tried to run command \""<<cmd<<"\", but it failed\n";
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113 | }
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114 | }
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115 | }
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116 | }
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117 |
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118 | char *namebuffer = filename.getcstr();
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119 | do {
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120 | #ifdef __WIN32__
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121 | gdbmfile = gdbm_open (namebuffer, block_size, gdbm_mode, 00664, NULL, (need_filelock) ? 1 : 0);
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122 | #else
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123 | gdbmfile = gdbm_open (namebuffer, block_size, gdbm_mode, 00664, NULL);
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124 | #endif
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125 | --num_retrys;
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126 | } while (num_retrys>0 && gdbmfile==NULL &&
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127 | (gdbm_errno==GDBM_CANT_BE_READER || gdbm_errno==GDBM_CANT_BE_WRITER));
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128 | delete []namebuffer;
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129 |
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130 | if (gdbmfile == NULL && logout != NULL) {
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131 | outconvertclass text_t2ascii;
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132 | (*logout) << text_t2ascii << "database open failed on: " << filename << "\n";
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133 | }
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134 |
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135 | return (gdbmfile != NULL);
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136 | }
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137 |
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138 |
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139 | void gdbmclass::closedatabase ()
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140 | {
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141 | if (gdbmfile == NULL) return;
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142 |
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143 | gdbm_close (gdbmfile);
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144 | gdbmfile = NULL;
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145 | openfile.clear();
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146 | }
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147 |
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148 |
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149 | void gdbmclass::deletekey (const text_t &key)
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150 | {
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151 | if (gdbmfile == NULL) return;
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152 |
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153 | // get a utf-8 encoded c string of the unicode key
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154 | datum key_data;
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155 | key_data.dptr = (to_utf8(key)).getcstr();
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156 | if (key_data.dptr == NULL) return;
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157 | key_data.dsize = strlen (key_data.dptr);
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158 |
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159 | // delete the key
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160 | gdbm_delete (gdbmfile, key_data);
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161 |
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162 | // free up the key memory
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163 | delete []key_data.dptr;
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164 | }
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165 |
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166 |
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167 | // returns file extension string
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168 | text_t gdbmclass::getfileextension ()
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169 | {
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170 | if (littleEndian()) return ".ldb";
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171 | return ".bdb";
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172 | }
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173 |
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174 |
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175 | // returns true on success
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176 | bool gdbmclass::getkeydata (const text_t& key, text_t &data)
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177 | {
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178 | datum key_data;
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179 | datum return_data;
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180 |
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181 | if (gdbmfile == NULL) return false;
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182 |
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183 | // get a utf-8 encoded c string of the unicode key
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184 | key_data.dptr = (to_utf8(key)).getcstr();
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185 | if (key_data.dptr == NULL) {
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186 | if (logout != NULL) (*logout) << "gdbmclass: out of memory\n";
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187 | return false;
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188 | }
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189 | key_data.dsize = strlen (key_data.dptr);
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190 |
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191 | // fetch the result
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192 | return_data = gdbm_fetch (gdbmfile, key_data);
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193 | delete []key_data.dptr;
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194 |
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195 | if (return_data.dptr == NULL) return false;
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196 |
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197 | data.setcarr (return_data.dptr, return_data.dsize);
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198 | free (return_data.dptr);
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199 | data = to_uni(data); // convert to unicode
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200 |
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201 | return true;
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202 | }
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203 |
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204 |
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205 | // returns array of keys
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206 | text_tarray gdbmclass::getkeys ()
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207 | {
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208 | text_tarray keys;
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209 |
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210 | text_t key = getfirstkey();
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211 | while (!key.empty())
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212 | {
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213 | keys.push_back(key);
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214 | key = getnextkey(key);
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215 | }
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216 |
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217 | return keys;
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218 | }
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219 |
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220 |
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221 | // returns true on success
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222 | bool gdbmclass::setkeydata (const text_t &key, const text_t &data)
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223 | {
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224 | if (gdbmfile == NULL) return false;
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225 |
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226 | // store the value
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227 | datum key_data;
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228 | datum data_data;
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229 |
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230 | // get a utf-8 encoded c string of the unicode key
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231 | key_data.dptr = (to_utf8(key)).getcstr();
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232 | if (key_data.dptr == NULL) {
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233 | if (logout != NULL) (*logout) << "gdbmclass: out of memory\n";
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234 | return false;
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235 | }
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236 | key_data.dsize = strlen (key_data.dptr);
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237 |
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238 | data_data.dptr = (to_utf8(data)).getcstr();
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239 | if (data_data.dptr == NULL) {
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240 | if (logout != NULL) (*logout) << "gdbmclass: out of memory\n";
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241 | delete []key_data.dptr;
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242 | return false;
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243 | }
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244 | data_data.dsize = strlen (data_data.dptr);
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245 |
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246 | int ret = gdbm_store (gdbmfile, key_data, data_data, GDBM_REPLACE);
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247 | delete []key_data.dptr;
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248 | delete []data_data.dptr;
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249 |
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250 | return (ret == 0);
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251 | }
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252 |
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253 |
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254 | // ----------------------------------------------------------------------------------------
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255 | // GDBM-ONLY FUNCTIONS
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256 | // ----------------------------------------------------------------------------------------
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257 |
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258 | // getfirstkey and getnextkey are used for traversing the database
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259 | // no insertions or deletions should be carried out while traversing
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260 | // the database. when there are no keys left to visit in the database
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261 | // an empty string is returned.
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262 | text_t gdbmclass::getfirstkey ()
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263 | {
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264 | if (gdbmfile == NULL) return g_EmptyText;
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265 |
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266 | // get the first key
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267 | datum firstkey_data = gdbm_firstkey (gdbmfile);
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268 | if (firstkey_data.dptr == NULL) return g_EmptyText;
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269 |
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270 | // convert it to text_t
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271 | text_t firstkey;
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272 | firstkey.setcarr (firstkey_data.dptr, firstkey_data.dsize);
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273 | free (firstkey_data.dptr);
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274 | return to_uni(firstkey); // convert to unicode
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275 | }
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276 |
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277 |
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278 | text_t gdbmclass::getnextkey (const text_t &key)
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279 | {
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280 | if (gdbmfile == NULL || key.empty()) return g_EmptyText;
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281 |
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282 | // get a utf-8 encoded c string of the unicode key
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283 | datum key_data;
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284 | key_data.dptr = (to_utf8(key)).getcstr();
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285 | if (key_data.dptr == NULL) return g_EmptyText;
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286 | key_data.dsize = strlen (key_data.dptr);
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287 |
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288 | // get the next key
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289 | datum nextkey_data = gdbm_nextkey (gdbmfile, key_data);
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290 | if (nextkey_data.dptr == NULL) {
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291 | delete []key_data.dptr;
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292 | return g_EmptyText;
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293 | }
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294 |
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295 | // convert it to text_t
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296 | text_t nextkey;
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297 | nextkey.setcarr (nextkey_data.dptr, nextkey_data.dsize);
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298 | free (nextkey_data.dptr);
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299 | delete []key_data.dptr;
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300 | return to_uni(nextkey); // convert to unicode
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301 | }
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