1 | /**********************************************************************
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2 | *
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3 | * gsdlunicode.h --
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4 | * Copyright (C) 1999 The New Zealand Digital Library Project
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5 | *
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6 | * PUT COPYRIGHT NOTICE HERE
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7 | *
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8 | * $Id: gsdlunicode.h 100 1999-01-08 02:33:16Z rjmcnab $
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9 | *
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10 | *********************************************************************/
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11 |
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12 |
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13 | #ifndef GSDLUNICODE_H
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14 | #define GSDLUNICODE_H
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15 |
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16 | #include "text_t.h"
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17 |
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18 |
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19 | // converts a unicode encode text_t string to a utf-8
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20 | // encoded text_t string
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21 | text_t to_utf8 (const text_t &in);
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22 |
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23 | // converts a utf-8 encoded text_t string to a unicode
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24 | // encoded text_t string
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25 | text_t to_uni (const text_t &in);
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26 |
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27 |
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28 |
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29 | #define MAXUTF8CHARLEN 3
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30 |
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31 | // convert from a utf-8 char stream to the text_t class
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32 | class utf8inconvertclass : public inconvertclass {
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33 | public:
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34 | utf8inconvertclass();
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35 | void reset ();
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36 | void convert (text_t &output, status_t &status);
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37 |
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38 | protected:
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39 | // buffer to hold unconverted characters in a stream
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40 | unsigned char utf8buf[MAXUTF8CHARLEN];
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41 | size_t utf8buflen;
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42 |
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43 | // returns the length that the current contents of the
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44 | // utf8buf should be
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45 | size_t getutf8charlen ();
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46 | };
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47 |
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48 |
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49 | // This class provides the option of removing zero width
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50 | // spaces (U+200B) during the output. By default this
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51 | // option is turned off. The functionality is actually
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52 | // implemented by the sub-classes, this class just provides
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53 | // the framework for these classes.
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54 | //
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55 | // Note: by convention reset() should not reset the rzws flag.
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56 | class rzwsoutconvertclass : public outconvertclass {
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57 | public:
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58 | rzwsoutconvertclass () {rzws = 0;};
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59 | set_rzws (int new_rzws) {rzws = new_rzws;};
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60 |
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61 | protected:
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62 | int rzws;
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63 | };
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64 |
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65 |
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66 | // Convert from a text_t class to a utf-8 char stream
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67 | class utf8outconvertclass : public rzwsoutconvertclass {
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68 | public:
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69 | utf8outconvertclass () {utf8buflen=0; utf8bufhere=0;};
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70 | void reset ();
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71 | // note that convert does not null-terminate the
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72 | // output array of characters
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73 | void convert (char *output, size_t maxlen,
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74 | size_t &len, status_t &status);
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75 |
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76 | protected:
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77 | unsigned char utf8buf[MAXUTF8CHARLEN];
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78 | size_t utf8buflen;
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79 | size_t utf8bufhere;
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80 | };
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81 |
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82 |
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83 | // mapdata_t is used by mapconvert to hold the map file data
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84 | class mapdata_t {
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85 | public:
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86 | mapdata_t();
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87 | bool loaded;
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88 | unsigned short *ptrs[256];
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89 | };
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90 |
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91 | // mapconvert is used in situations where conversion is best
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92 | // done using a map file. The mapfile should reside in
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93 | // gsdlhome/unicode.
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94 | class mapconvert {
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95 | public:
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96 | mapconvert ();
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97 | ~mapconvert () {unloadmapfile();};
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98 |
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99 | // loadmapfile should be called before any conversion is done
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100 | bool loadmapfile (const text_t &thegsdlhome, const text_t &theencoding,
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101 | unsigned short theabsentc);
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102 | void unloadmapfile ();
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103 |
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104 | unsigned short convert (unsigned short c);
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105 |
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106 | // note that this version of convert has different semantics to
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107 | // the convertclass version.
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108 | text_t convert (const text_t &instr);
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109 |
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110 | protected:
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111 | text_t gsdlhome;
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112 | text_t encoding;
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113 | unsigned short absentc;
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114 | mapdata_t mapdata;
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115 | };
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116 |
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117 |
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118 |
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119 | #define MAXMAPCHARLEN 2
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120 |
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121 | // convert from a gb char stream to the unicode text_t class
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122 | class mapinconvertclass : public inconvertclass {
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123 | public:
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124 | mapinconvertclass();
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125 |
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126 | // loadmapfile should be called before any conversion takes
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127 | // place
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128 | bool loadmapfile (const text_t &thegsdlhome, const text_t &theencoding,
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129 | unsigned short theabsentc) {
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130 | return converter.loadmapfile (thegsdlhome, theencoding, theabsentc);
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131 | };
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132 |
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133 | void reset ();
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134 | void convert (text_t &output, status_t &status);
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135 |
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136 | protected:
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137 | // buffer to hold unconverted characters in a stream
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138 | unsigned char mapbuf[MAXMAPCHARLEN];
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139 | size_t mapbuflen;
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140 |
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141 | // note: multiple instances of mapinconvert class are expensive
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142 | // as each will have its own copy of the map file data. This
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143 | // could be reduced by making map2unimap static, but then it
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144 | // wouldn't be thread safe.
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145 | mapconvert converter;
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146 |
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147 | // returns the length that the current contents of the
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148 | // mapbuf should be
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149 | inline size_t getmapcharlen () {
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150 | if (mapbuflen == 0) return 0;
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151 | if (mapbuf[0] < 0x80) return 1;
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152 | return 2;
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153 | }
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154 | };
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155 |
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156 |
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157 | // Convert from a text_t class to a map char stream
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158 | class mapoutconvertclass : public rzwsoutconvertclass {
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159 | public:
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160 | mapoutconvertclass ();
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161 |
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162 | // loadmapfile should be called before any conversion takes
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163 | // place
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164 | bool loadmapfile (const text_t &thegsdlhome, const text_t &theencoding,
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165 | unsigned short theabsentc) {
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166 | return converter.loadmapfile (thegsdlhome, theencoding, theabsentc);
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167 | };
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168 |
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169 | void reset ();
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170 | void convert (char *output, size_t maxlen,
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171 | size_t &len, status_t &status);
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172 |
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173 | protected:
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174 | unsigned char mapbuf[MAXMAPCHARLEN];
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175 | size_t mapbuflen;
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176 | size_t mapbufhere;
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177 |
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178 | mapconvert converter;
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179 | };
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180 |
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181 | #endif
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