1 | ###########################################################################
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2 | #
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3 | # gb.pm --
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4 | # A component of the Greenstone digital library software
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5 | # from the New Zealand Digital Library Project at the
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6 | # University of Waikato, New Zealand.
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7 | #
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8 | # Copyright (C) 1999 New Zealand Digital Library Project
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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 | #! /usr/local/bin/perl5 -w
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27 |
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28 | # useful methods for dealing with the GuoBiao (GB) encoding
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29 |
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30 | package gb;
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31 |
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32 | use util;
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33 |
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34 | # %encodings is of the form:
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35 | #
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36 | # encodings{encodingname-encodingname}->blocktranslation
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37 | # blocktranslation->[[0-255],[256-511], ..., [65280-65535]]
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38 | #
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39 | # Any of the top translation blocks can point to an undefined
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40 | # value. This data structure aims to allow fast translation and
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41 | # efficient storage.
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42 |
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43 | # @array256 is used for initialisation, there must be
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44 | # a better way...
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45 | @array256 = (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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46 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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47 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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48 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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49 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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50 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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51 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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52 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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53 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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54 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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55 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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56 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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57 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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58 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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59 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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60 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0);
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61 |
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62 |
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63 | %translations = ();
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64 |
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65 |
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66 | # gb2unicode uses the GBK translation table
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67 | sub gb2unicode {
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68 | generalgb2unicode ("GBK", @_);
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69 | }
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70 |
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71 | # returns a pointer to unicode array
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72 | sub generalgb2unicode {
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73 | my ($encoding, $intext) = @_;
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74 |
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75 | if (!&loadmapencoding ("$encoding-unicode")) {
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76 | print STDERR "gb: ERROR - could not load encoding $encoding\n";
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77 | return [];
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78 | }
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79 |
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80 | my @outtext = ();
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81 | my $encodename = "$encoding-unicode";
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82 | my $len = length($intext);
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83 | my ($c1, $c2);
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84 | my $i = 0;
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85 |
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86 | while ($i < $len) {
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87 | if (($c1 = ord(substr($intext, $i, 1))) >= 0x81) {
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88 | if ($i+1 < $len) {
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89 | # found a GB character, put black square if cannot translate
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90 | $c2 = ord(substr($intext, $i+1, 1));
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91 | my $c = &transchar ($encodename, ($c1 << 8) | $c2);
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92 | $c = 0x25a1 if $c == 0;
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93 | push (@outtext, $c);
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94 | $i += 2;
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95 |
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96 | } else {
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97 | # error
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98 | print STDERR "gb: ERROR missing second half of GB character\n";
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99 | $i++;
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100 | }
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101 |
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102 | } else {
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103 | # normal ascii character
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104 | push (@outtext, $c1) if ($c1 < 0x80);
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105 | $i++;
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106 | }
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107 | }
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108 |
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109 | return \@outtext;
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110 | }
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111 |
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112 |
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113 | # unicode2gb uses the GBK translation table
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114 | sub unicode2gb {
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115 | generalunicode2gb ("GBK", @_);
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116 | }
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117 |
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118 | # returns a gb string. Note that this will not translate
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119 | # traditional forms of characters to their simplified forms
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120 | # Any traditional characters in the unicode will not be translated
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121 | sub generalunicode2gb {
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122 | my ($encoding, $intext) = @_;
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123 |
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124 | # load the encoding (if it is not already loaded)
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125 | if (!&loadmapencoding ("unicode-$encoding")) {
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126 | print STDERR "gb: ERROR - could not load encoding $encoding\n";
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127 | return "";
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128 | }
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129 |
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130 | # translate the string
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131 | my ($num, $gbc);
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132 | my $outtext = "";
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133 | my $encodename = "unicode-$encoding";
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134 | foreach $num (@$intext) {
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135 | if ($num < 0x80) {
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136 | # normal ascii character
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137 | $outtext .= chr ($num);
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138 | } else {
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139 | # gb character
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140 | my $gbc = &transchar ($encodename, $num);
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141 | $gbc = 0xa1f5 if $gbc == 0;
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142 | $outtext .= chr ($gbc >> 8);
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143 | $outtext .= chr ($gbc & 0xff);
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144 | }
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145 | }
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146 |
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147 | return $outtext;
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148 | }
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149 |
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150 |
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151 | # It returns 1 if successful, 0 if unsuccessful
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152 | sub loadmapencoding {
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153 | my ($encoding) = @_;
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154 |
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155 | # check to see if the encoding has already been loaded
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156 | return 1 if (defined $translations{$encoding});
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157 |
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158 | my $filename = $encoding;
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159 | $filename =~ s/\-//;
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160 | $filename =~ s/unicode/u/i;
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161 | $filename =~ tr/A-Z/a-z/;
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162 | $filename .= ".ump"; # unicode map file
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163 |
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164 | return 0 unless open (MAPFILE, "$ENV{'GSDLHOME'}/unicode/$filename");
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165 |
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166 | $translations{$encoding} = [@array256];
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167 | my $block = $translations{$encoding};
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168 |
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169 | my ($in,$i,$j);
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170 | while (read(MAPFILE, $in, 1) == 1) {
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171 | $i = unpack ("C", $in);
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172 | $block->[$i] = [@array256];
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173 | for ($j=0; $j<256 && read(MAPFILE, $in, 2)==2; $j++) {
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174 | my ($n1, $n2) = unpack ("CC", $in);
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175 | $block->[$i]->[$j] = ($n1*256) + $n2;
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176 | }
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177 | }
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178 |
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179 | close (MAPFILE);
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180 | }
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181 |
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182 |
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183 |
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184 | # loadencoding expects the mapfile to contain (at least) two
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185 | # tab-seperated fields. The first field is the mapped value
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186 | # and the second field is the unicode value.
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187 | #
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188 | # It returns 1 if successful, 0 if unsuccessful
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189 | sub loadencoding {
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190 | my ($encoding, $mapfile) = @_;
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191 |
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192 | my $to = "$encoding-unicode";
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193 | my $from = "unicode-$encoding";
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194 |
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195 | # check to see if the encoding has already been loaded
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196 | if (defined $translations{$to} && defined $translations{$from}) {
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197 | return 1;
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198 | }
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199 |
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200 | return 0 unless open (MAPFILE, $mapfile);
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201 |
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202 | my ($line, @line);
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203 | $translations{$to} = [@array256];
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204 | $translations{$from} = [@array256];
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205 | while (defined ($line = <MAPFILE>)) {
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206 | # remove comments
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207 | $line =~ s/\#.*$//;
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208 | next unless $line =~ /\S/;
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209 |
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210 | # split the line into fields and do a few
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211 | # simple sanity checks
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212 | @line = split (/\t/, $line);
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213 | next unless (scalar(@line) >= 2 &&
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214 | $line[0] =~ /^0x/ &&
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215 | $line[1] =~ /^0x/);
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216 |
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217 | my $gbc = hex($line[0]);
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218 | my $unic = hex($line[1]);
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219 |
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220 | # gbk has already had the necessary most significant
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221 | # bits set (it is used in the encoding
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222 | $gbc = $gbc | 0x8080 unless ($encoding =~ /gbk/i);
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223 |
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224 | &addchartrans ($translations{$to}, $gbc, $unic);
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225 | &addchartrans ($translations{$from}, $unic, $gbc);
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226 | }
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227 |
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228 | close (MAPFILE);
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229 |
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230 | return 1;
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231 | }
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232 |
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233 | sub showfilled {
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234 | my ($block) = @_;
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235 | my $count = 0;
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236 | foreach $el (@$block) {
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237 | if (ref ($el) eq "ARRAY") {
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238 | print "1";
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239 | $count++;
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240 | } else {
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241 | print "0";
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242 | }
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243 | }
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244 | print "\n";
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245 | print "total: $count\n";
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246 | }
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247 |
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248 |
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249 | # addchartrans adds one character translation to a translation block.
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250 | # It also simplifies the translation block if possible.
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251 | sub addchartrans {
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252 | my ($block, $from, $to) = @_;
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253 | my $i = 0;
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254 |
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255 | my $high = ($from / 256) % 256;
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256 | my $low = $from % 256;
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257 |
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258 | if (ref ($block->[$high]) ne "ARRAY") {
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259 | $block->[$high] = [@array256];
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260 | }
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261 | $block->[$high]->[$low] = $to;
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262 | }
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263 |
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264 |
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265 | sub transchar {
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266 | my ($encoding, $from) = @_;
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267 | my $high = ($from / 256) % 256;
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268 | my $low = $from % 256;
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269 |
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270 | return 0 unless defined $translations{$encoding};
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271 |
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272 | my $block = $translations{$encoding};
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273 |
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274 | if (ref ($block->[$high]) ne "ARRAY") {
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275 | return 0;
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276 | }
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277 | return $block->[$high]->[$low];
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278 | }
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279 |
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280 |
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281 | 1;
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