1 | /**********************************************************************
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2 | *
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3 | * gsdlunicode.cpp --
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4 | * Copyright (C) 1999 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 | * $Id: gsdlunicode.cpp 1236 2000-06-23 05:03:29Z nzdl $
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25 | *
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26 | *********************************************************************/
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27 |
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28 | /*
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29 | $Log$
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30 | Revision 1.14 2000/06/23 05:03:29 nzdl
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31 | fixed a couple of compiler warnings created by the new encoding stuff
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32 |
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33 | Revision 1.13 2000/06/23 03:21:38 sjboddie
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34 | Created converter classes for simple 8 bit encodings that use a
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35 | simple textual map file. Instances of these classes are used to handle
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36 | the Windows 1256 (Arabic) encoding.
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37 |
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38 | Revision 1.12 2000/04/06 19:58:02 cs025
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39 | Correcting a correction - reinstated all lib files due to silly
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40 | CVS confusion.
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41 |
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42 | Revision 1.10 1999/09/07 04:57:43 sjboddie
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43 | added gpl notice
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44 |
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45 | Revision 1.9 1999/07/21 07:23:17 rjmcnab
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46 | Added setmapfile function to map conversion utilities so the map file
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47 | does not need to be loaded when map conversion object is created.
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48 |
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49 | Revision 1.8 1999/07/01 04:03:45 rjmcnab
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50 | Optimised utf8inconvertclass::convert slightly.
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51 |
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52 | Revision 1.7 1999/06/30 04:59:03 rjmcnab
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53 | Added a to_utf8 function that takes iterators as input.
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54 |
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55 | Revision 1.6 1999/06/26 01:05:04 rjmcnab
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56 | No real changes.
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57 |
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58 | Revision 1.5 1999/01/12 01:50:59 rjmcnab
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59 |
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60 | Standard header.
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61 |
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62 | Revision 1.4 1999/01/08 02:33:15 rjmcnab
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63 |
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64 | Added standard header to source files.
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65 |
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66 | */
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67 |
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68 |
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69 | #include "gsdlunicode.h"
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70 |
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71 |
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72 | // unitool is currently in mg, if mg is not being used it should
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73 | // be moved into GSDLHOME/lib
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74 | #include "unitool.h"
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75 |
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76 | #include "fileutil.h"
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77 |
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78 | #include <stdio.h>
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79 |
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80 | #if defined(GSDL_USE_OBJECTSPACE)
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81 | # include <ospace\std\iostream>
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82 | # include <ospace\std\fstream>
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83 | #elif defined(GSDL_USE_IOS_H)
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84 | # include <iostream.h>
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85 | # include <fstream.h>
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86 | #else
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87 | # include <iostream>
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88 | # include <fstream>
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89 | #endif
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90 |
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91 |
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92 | // converts a unicode encode text_t string to a utf-8
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93 | // encoded text_t string
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94 | text_t to_utf8 (text_t::const_iterator here, text_t::const_iterator end) {
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95 | text_t out;
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96 |
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97 | unsigned char thischar[MAXUTF8CHARLEN];
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98 | int i, charlen;
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99 |
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100 | while (here != end) {
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101 | charlen = output_utf8_char (*here, thischar, &thischar[MAXUTF8CHARLEN-1]);
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102 | for (i=0; i<charlen; i++) out.push_back(thischar[i]);
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103 | here++;
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104 | }
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105 |
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106 | return out;
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107 | }
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108 |
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109 | // converts a utf-8 encoded text_t string to a unicode
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110 | // encoded text_t string
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111 | text_t to_uni (const text_t &in) {
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112 | text_t out;
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113 | unsigned char *in_cstr = (unsigned char *)in.getcstr();
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114 | unsigned char *here = in_cstr;
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115 | unsigned char *end = in_cstr;
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116 |
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117 | unsigned short unichar;
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118 | int charlen = 0;
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119 |
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120 | // get the last valid character in the string
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121 | while (*end != '\0') end++;
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122 | end--;
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123 |
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124 | while ((charlen = parse_utf8_char (here, end, &unichar)) > 0) {
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125 | out.push_back(unichar);
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126 | here += charlen;
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127 | }
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128 |
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129 | delete in_cstr;
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130 |
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131 | return out;
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132 | }
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133 |
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134 |
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135 |
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136 | utf8inconvertclass::utf8inconvertclass () {
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137 | utf8buflen = 0;
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138 | }
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139 |
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140 | void utf8inconvertclass::reset () {
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141 | start = NULL;
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142 | len = 0;
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143 | utf8buflen=0;
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144 | }
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145 |
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146 | void utf8inconvertclass::convert (text_t &output, status_t &status) {
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147 | output.clear();
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148 | output.reserve (len/3);
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149 |
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150 | if (start == NULL || len == 0) {
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151 | if (utf8buflen == 0) status = finished;
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152 | else status = stopped;
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153 | return;
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154 | }
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155 |
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156 | // don't want any funny sign conversions happening
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157 | unsigned char *here = (unsigned char *)start;
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158 | unsigned char *end = here+len-1;
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159 | unsigned short c;
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160 | size_t realcharlen;
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161 |
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162 | size_t charlen = getutf8charlen ();
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163 | while (len > 0) {
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164 | if (charlen == 0) {
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165 | // start parsing a new character
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166 | utf8buflen = 0;
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167 |
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168 | // fast common case
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169 | while (len > 3) {
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170 | realcharlen = parse_utf8_char (here, end, &c);
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171 | output.push_back (c);
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172 | here += realcharlen;
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173 | len -= realcharlen;
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174 | }
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175 |
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176 | utf8buf[utf8buflen++] = *here;
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177 | ++here;
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178 | --len;
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179 | charlen = getutf8charlen ();
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180 |
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181 | } else if (utf8buflen < charlen) {
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182 | // assumes charlen is always less than MAXUTF8CHARLEN
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183 | utf8buf[utf8buflen++] = *here;
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184 | ++here;
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185 | --len;
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186 | }
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187 |
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188 | if (utf8buflen == charlen) {
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189 | // got a complete character
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190 | realcharlen = parse_utf8_char (utf8buf, &utf8buf[utf8buflen-1], &c);
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191 | output.push_back (c);
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192 |
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193 | // move any unparsed characters. If an error occurred some of
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194 | // the characters might be unused.
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195 | int i;
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196 | int diff = utf8buflen - realcharlen;
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197 | for (i=0; i < diff; i++) utf8buf[i] = utf8buf[i+diff];
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198 | utf8buflen = diff;
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199 | charlen = getutf8charlen ();
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200 | }
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201 | }
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202 |
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203 | start = (char *)here; // save current position
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204 |
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205 | if (utf8buflen == 0) status = finished;
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206 | else status = stopped;
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207 | }
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208 |
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209 |
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210 | // returns the length that the current contents of the
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211 | // utf8buf should be
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212 | size_t utf8inconvertclass::getutf8charlen () {
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213 | if (utf8buflen == 0) return 0;
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214 |
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215 | // one byte character
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216 | if (utf8buf[0] < 0x80) return 1;
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217 |
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218 | // error, is not the start of a utf-8 character
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219 | if (utf8buf[0] < 0xc0) return 1;
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220 |
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221 | // two bute character
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222 | if (utf8buf[0] < 0xe0) return 2;
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223 |
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224 | // three byte character
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225 | if (utf8buf[0] < 0xf0) return 3;
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226 |
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227 | // error, character too long for unicode
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228 | return 1;
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229 | }
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230 |
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231 |
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232 | void utf8outconvertclass::reset () {
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233 | input = NULL;
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234 | outs = NULL;
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235 | utf8buflen = 0;
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236 | utf8bufhere = 0;
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237 | }
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238 |
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239 | // note that convert does not null-terminate the
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240 | // output array of characters
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241 | void utf8outconvertclass::convert (char *output, size_t maxlen,
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242 | size_t &len, status_t &status) {
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243 | if (input == NULL || output == NULL) {
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244 | if (utf8buflen == 0) status = finished;
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245 | else status = unfinished;
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246 | return;
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247 | }
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248 |
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249 | // don't want any funny sign conversions happening
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250 | unsigned char *uoutput = (unsigned char *)output;
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251 | text_t::iterator textend = input->end();
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252 | len = 0;
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253 | while (len < maxlen) {
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254 | // empty the contents of the internal buffer
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255 | if (utf8buflen > 0) {
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256 | while (len < maxlen && utf8bufhere < utf8buflen) {
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257 | *uoutput = utf8buf[utf8bufhere];
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258 | uoutput++;
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259 | len++;
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260 | utf8bufhere++;
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261 | }
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262 |
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263 | if (utf8bufhere == utf8buflen) {
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264 | utf8bufhere = 0;
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265 | utf8buflen = 0;
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266 | }
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267 | }
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268 |
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269 | // fill up the buffer with the next character
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270 | if (utf8buflen == 0) {
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271 | if (texthere == textend) break; // finished!
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272 | if (!rzws || (*texthere != 0x200b))
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273 | utf8buflen = output_utf8_char (*texthere, utf8buf,
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274 | &utf8buf[MAXUTF8CHARLEN-1]);
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275 | texthere++;
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276 | utf8bufhere = 0;
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277 | }
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278 | }
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279 |
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280 | if (texthere == textend && utf8buflen == 0) status = finished;
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281 | else status = unfinished;
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282 | }
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283 |
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284 |
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285 |
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286 |
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287 |
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288 |
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289 | mapdata_t::mapdata_t () {
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290 | int i;
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291 |
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292 | // reset all the map ptrs to be NULL
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293 | for (i=0; i<256; i++) {
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294 | ptrs[i] = (unsigned short *)NULL;
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295 | }
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296 |
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297 | // say nothing has been loaded
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298 | loaded = false;
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299 | }
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300 |
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301 |
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302 | mapconvert::mapconvert () {
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303 | absentc = 0;
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304 | }
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305 |
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306 | // setmapfile will cause loadmapfile to be called when conversion is
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307 | // needed
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308 | bool mapconvert::setmapfile (const text_t &thegsdlhome, const text_t &theencoding,
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309 | unsigned short theabsentc) {
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310 | // check to see if the mapfile has been already loaded
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311 | if (mapdata.loaded && gsdlhome == thegsdlhome &&
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312 | encoding == theencoding && absentc == theabsentc)
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313 | return true;
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314 |
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315 | unloadmapfile ();
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316 | gsdlhome = thegsdlhome;
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317 | encoding = theencoding;
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318 | absentc = theabsentc;
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319 |
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320 | return true;
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321 | }
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322 |
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323 |
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324 |
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325 | // loadmapfile should be called before any conversion is done
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326 | bool mapconvert::loadmapfile (const text_t &thegsdlhome,
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327 | const text_t &theencoding,
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328 | unsigned short theabsentc) {
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329 | FILE *mapfilein = (FILE *)NULL;
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330 |
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331 | // check to see if the mapfile has been already loaded
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332 | if (mapdata.loaded && gsdlhome == thegsdlhome &&
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333 | encoding == theencoding && absentc == theabsentc)
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334 | return true;
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335 |
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336 | unloadmapfile ();
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337 | gsdlhome = thegsdlhome;
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338 | encoding = theencoding;
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339 | absentc = theabsentc;
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340 |
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341 | // open the map file
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342 | text_t filename = filename_cat (gsdlhome, "unicode");
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343 | filename = filename_cat (filename, encoding);
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344 | filename += ".ump";
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345 | char *cfilename = filename.getcstr();
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346 | if (cfilename == (char *)NULL) return false;
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347 | mapfilein = fopen(cfilename, "rb");
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348 | delete cfilename;
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349 |
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350 | if (mapfilein == (FILE *)NULL) return false;
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351 |
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352 | unsigned char c, n1, n2;
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353 | unsigned short *arrptr;
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354 | int i;
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355 | c = fgetc (mapfilein);
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356 | while (!feof (mapfilein)) {
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357 | if (mapdata.ptrs[c] == (unsigned short *)NULL) {
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358 | // allocate a new array
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359 | arrptr = new unsigned short[256];
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360 | mapdata.ptrs[c] = arrptr;
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361 | } else arrptr = mapdata.ptrs[c];
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362 |
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363 | // clear the array
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364 | for (i=0; i<256; i++) arrptr[i] = 0;
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365 |
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366 | // read in this block
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367 | n1 = fgetc (mapfilein);
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368 | n2 = fgetc (mapfilein);
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369 | i=0;
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370 | while (!feof (mapfilein)) {
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371 | arrptr[i] = ((unsigned short)n1 << 8) | (unsigned short)n2;
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372 |
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373 | i++;
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374 | if (i >= 256) break;
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375 | n1 = fgetc (mapfilein);
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376 | n2 = fgetc (mapfilein);
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377 | }
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378 |
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379 | c = fgetc (mapfilein);
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380 | }
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381 |
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382 | mapdata.loaded = true;
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383 |
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384 | return true;
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385 | }
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386 |
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387 | void mapconvert::unloadmapfile () {
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388 | if (!mapdata.loaded) return;
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389 |
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390 | int i;
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391 | for (i=0; i<256; i++) {
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392 | if (mapdata.ptrs[i] != (unsigned short *)NULL) {
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393 | delete [] mapdata.ptrs[i];
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394 | mapdata.ptrs[i] = (unsigned short *)NULL;
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395 | }
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396 | }
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397 |
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398 | mapdata.loaded = false;
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399 | }
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400 |
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401 |
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402 | unsigned short mapconvert::convert (unsigned short c) {
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403 | if (!mapdata.loaded) {
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404 | if (!gsdlhome.empty() && !encoding.empty() &&
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405 | loadmapfile (gsdlhome, encoding, absentc)) {
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406 | // do nothing, successfully loaded database
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407 | } else return absentc;
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408 | }
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409 |
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410 | if (c == 0) return 0; // 0 always maps to 0...
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411 |
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412 | unsigned short n1 = c >> 8;
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413 | unsigned short n2 = c & 0xff;
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414 |
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415 | unsigned short *arrptr = mapdata.ptrs[n1];
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416 | if (arrptr == (unsigned short *)NULL) return absentc;
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417 |
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418 | if (arrptr[n2] == 0) return absentc;
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419 | return arrptr[n2];
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420 | }
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421 |
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422 | text_t mapconvert::convert (const text_t &instr) {
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423 | if (!mapdata.loaded) return absentc;
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424 |
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425 | text_t outstr;
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426 | text_t::const_iterator here = instr.begin();
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427 | text_t::const_iterator end = instr.end();
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428 |
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429 | while (here != end) {
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430 | outstr.push_back(this->convert(*here));
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431 | here++;
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432 | }
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433 |
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434 | return outstr;
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435 | }
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436 |
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437 |
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438 |
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439 |
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440 | mapinconvertclass::mapinconvertclass () {
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441 | mapbuflen = 0;
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442 | }
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443 |
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444 | void mapinconvertclass::reset () {
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445 | start = NULL;
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446 | len = 0;
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447 | mapbuflen=0;
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448 | }
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449 |
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450 | void mapinconvertclass::convert (text_t &output, status_t &status) {
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451 | output.clear();
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452 |
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453 | if (start == NULL || len == 0) {
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454 | if (mapbuflen == 0) status = finished;
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455 | else status = stopped;
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456 | return;
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457 | }
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458 |
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459 | // don't want any funny sign conversions happening
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460 | unsigned char *here = (unsigned char *)start;
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461 |
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462 | size_t charlen = getmapcharlen ();
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463 | while (len > 0) {
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464 | if (charlen == 0) {
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465 | // start parsing a new character
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466 | mapbuflen = 0;
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467 | mapbuf[mapbuflen++] = *here;
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468 | ++here;
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469 | --len;
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470 | charlen = getmapcharlen ();
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471 |
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472 | } else if (mapbuflen < charlen) {
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473 | // assumes charlen is always less than MAXMAPCHARLEN
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474 | mapbuf[mapbuflen++] = *here;
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475 | ++here;
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476 | --len;
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477 | }
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478 |
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479 | if (mapbuflen == charlen) {
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480 | // got a complete character
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481 | if (charlen == 1) {
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482 | // ascii character
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483 | output.push_back (mapbuf[0]);
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484 |
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485 | } else {
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486 | // two byte character
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487 | output.push_back (converter.convert(((unsigned short)mapbuf[0] << 8) |
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488 | (unsigned short)mapbuf[1]));
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489 | }
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490 |
|
---|
491 | mapbuflen = 0;
|
---|
492 | charlen = 0;
|
---|
493 | }
|
---|
494 | }
|
---|
495 |
|
---|
496 | start = (char *)here; // save current position
|
---|
497 |
|
---|
498 | if (mapbuflen == 0) status = finished;
|
---|
499 | else status = stopped;
|
---|
500 | }
|
---|
501 |
|
---|
502 |
|
---|
503 |
|
---|
504 | mapoutconvertclass::mapoutconvertclass () {
|
---|
505 | mapbuflen=0;
|
---|
506 | mapbufhere=0;
|
---|
507 | }
|
---|
508 |
|
---|
509 | void mapoutconvertclass::reset () {
|
---|
510 | input = NULL;
|
---|
511 | outs = NULL;
|
---|
512 | mapbuflen = 0;
|
---|
513 | mapbufhere = 0;
|
---|
514 | }
|
---|
515 |
|
---|
516 | // note that convert does not null-terminate the
|
---|
517 | // output array of characters
|
---|
518 | void mapoutconvertclass::convert (char *output, size_t maxlen,
|
---|
519 | size_t &len, status_t &status) {
|
---|
520 | unsigned short outc;
|
---|
521 |
|
---|
522 | if (input == NULL || output == NULL) {
|
---|
523 | if (mapbuflen == 0) status = finished;
|
---|
524 | else status = unfinished;
|
---|
525 | return;
|
---|
526 | }
|
---|
527 |
|
---|
528 | // don't want any funny sign conversions happening
|
---|
529 | unsigned char *uoutput = (unsigned char *)output;
|
---|
530 | text_t::iterator textend = input->end();
|
---|
531 | len = 0;
|
---|
532 | while (len < maxlen) {
|
---|
533 | // empty the contents of the internal buffer
|
---|
534 | if (mapbuflen > 0) {
|
---|
535 | while (len < maxlen && mapbufhere < mapbuflen) {
|
---|
536 | *uoutput = mapbuf[mapbufhere];
|
---|
537 | uoutput++;
|
---|
538 | len++;
|
---|
539 | mapbufhere++;
|
---|
540 | }
|
---|
541 |
|
---|
542 | if (mapbufhere == mapbuflen) {
|
---|
543 | mapbufhere = 0;
|
---|
544 | mapbuflen = 0;
|
---|
545 | }
|
---|
546 | }
|
---|
547 |
|
---|
548 | // fill up the buffer with the next character
|
---|
549 | if (mapbuflen == 0) {
|
---|
550 | if (texthere == textend) break; // finished!
|
---|
551 | if (!rzws || (*texthere != 0x200b)) {
|
---|
552 | if (*texthere < 0x80) {
|
---|
553 | mapbuf[0] = (unsigned char)*texthere;
|
---|
554 | mapbuflen = 1;
|
---|
555 | } else {
|
---|
556 | outc = converter.convert (*texthere);
|
---|
557 | mapbuf[0] = (unsigned char)(outc >> 8);
|
---|
558 | mapbuf[1] = (unsigned char)(outc & 0xff);
|
---|
559 | mapbuflen = 2;
|
---|
560 | }
|
---|
561 | }
|
---|
562 |
|
---|
563 | texthere++;
|
---|
564 | mapbufhere = 0;
|
---|
565 | }
|
---|
566 | }
|
---|
567 |
|
---|
568 | if (texthere == textend && mapbuflen == 0) status = finished;
|
---|
569 | else status = unfinished;
|
---|
570 | }
|
---|
571 |
|
---|
572 |
|
---|
573 | bool simplemapconvert::loadmapfile (bool in) {
|
---|
574 | if (loaded) return true;
|
---|
575 | if (mapfile.empty()) return false;
|
---|
576 |
|
---|
577 | char *cfilename = mapfile.getcstr();
|
---|
578 | #ifdef GSDL_USE_IOS_H
|
---|
579 | ifstream mapfilein (cfilename, ios::in | ios::nocreate);
|
---|
580 | #else
|
---|
581 | ifstream mapfilein (cfilename, ios::in);
|
---|
582 | #endif
|
---|
583 | delete cfilename;
|
---|
584 | if (!mapfilein) return false;
|
---|
585 |
|
---|
586 | char cline[2048];
|
---|
587 | text_t line;
|
---|
588 |
|
---|
589 | while (!mapfilein.eof()) {
|
---|
590 | mapfilein.getline (cline, 2048);
|
---|
591 | line.clear();
|
---|
592 | line.appendcstr (cline);
|
---|
593 | if (line.empty()) continue;
|
---|
594 | // remove comments
|
---|
595 | text_t::iterator end = line.end();
|
---|
596 | text_t::iterator here = findchar (line.begin(), end, '#');
|
---|
597 | if (here != end) {
|
---|
598 | line.erase (here, end);
|
---|
599 | if (line.empty()) continue;
|
---|
600 | }
|
---|
601 |
|
---|
602 | text_tarray parts;
|
---|
603 | splitchar (line.begin(), line.end(), '\t', parts);
|
---|
604 |
|
---|
605 | // do some simple sanity checks
|
---|
606 | if (parts.size() < 2) continue;
|
---|
607 | text_t::iterator begin1 = parts[0].begin();
|
---|
608 | text_t::iterator begin2 = parts[1].begin();
|
---|
609 | if (*begin1 != '0' || *(begin1+1) != 'x') continue;
|
---|
610 | if (*begin2 != '0' || *(begin2+1) != 'x') continue;
|
---|
611 | char *from = parts[0].getcstr();
|
---|
612 | char *to = parts[1].getcstr();
|
---|
613 | unsigned int f = 0, t = 0;
|
---|
614 | sscanf (from, "%i", &f);
|
---|
615 | sscanf (to, "%i", &t);
|
---|
616 | delete from;
|
---|
617 | delete to;
|
---|
618 |
|
---|
619 | if (in) mapping[(unsigned short)f] = (unsigned short)t;
|
---|
620 | else mapping[(unsigned short)t] = (unsigned short)f;
|
---|
621 | }
|
---|
622 |
|
---|
623 | loaded = true;
|
---|
624 | return true;
|
---|
625 | }
|
---|
626 |
|
---|
627 | unsigned short simplemapconvert::convert (unsigned short c, bool in) {
|
---|
628 |
|
---|
629 | if (!loaded)
|
---|
630 | if (!loadmapfile(in)) return absentc;
|
---|
631 |
|
---|
632 | return mapping[c];
|
---|
633 | }
|
---|
634 |
|
---|
635 |
|
---|
636 | void simplemapinconvertclass::convert (text_t &output, status_t &status) {
|
---|
637 | output.clear();
|
---|
638 |
|
---|
639 | if (start == NULL || len == 0) {
|
---|
640 | status = finished;
|
---|
641 | return;
|
---|
642 | }
|
---|
643 |
|
---|
644 | // don't want any funny sign conversions happening
|
---|
645 | unsigned char *here = (unsigned char *)start;
|
---|
646 | while (len > 0) {
|
---|
647 |
|
---|
648 | if (*here < 0x80)
|
---|
649 | output.push_back (*here); // append this character
|
---|
650 | else
|
---|
651 | output.push_back (converter.convert(*here, true));
|
---|
652 |
|
---|
653 | ++here;
|
---|
654 | --len;
|
---|
655 | }
|
---|
656 |
|
---|
657 | start = (char *)here; // save current position
|
---|
658 | status = finished;
|
---|
659 | }
|
---|
660 |
|
---|
661 |
|
---|
662 | void simplemapoutconvertclass::convert (char *output, size_t maxlen,
|
---|
663 | size_t &len, status_t &status) {
|
---|
664 |
|
---|
665 | if (input == NULL || output == NULL) {
|
---|
666 | status = finished;
|
---|
667 | return;
|
---|
668 | }
|
---|
669 |
|
---|
670 | // don't want any funny sign conversions happening
|
---|
671 | unsigned char *uoutput = (unsigned char *)output;
|
---|
672 | text_t::iterator textend = input->end();
|
---|
673 | len = 0;
|
---|
674 | while ((len < maxlen) && (texthere != textend)) {
|
---|
675 |
|
---|
676 | if (*texthere < 0x80) *uoutput = (unsigned char)(*texthere);
|
---|
677 | else *uoutput = converter.convert (*texthere, false);
|
---|
678 |
|
---|
679 | ++uoutput;
|
---|
680 | ++len;
|
---|
681 | ++texthere;
|
---|
682 | }
|
---|
683 |
|
---|
684 | if (texthere == textend) status = finished;
|
---|
685 | else status = unfinished;
|
---|
686 | }
|
---|