[537] | 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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[71] | 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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[83] | 66 | # gb2unicode uses the GBK translation table
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[71] | 67 | sub gb2unicode {
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[83] | 68 | generalgb2unicode ("GBK", @_);
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[71] | 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, $intext) = @_;
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[92] | 74 |
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| 75 | if (!&loadmapencoding ("$encoding-unicode")) {
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[71] | 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 < $len) {
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[83] | 87 | if (($c1 = ord(substr($intext, $i, 1))) >= 0x81) {
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[73] | 88 | if ($i+1 < $len) {
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[83] | 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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[71] | 96 | } else {
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| 97 | # error
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[73] | 98 | print STDERR "gb: ERROR missing second half of GB character\n";
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[71] | 99 | $i++;
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| 100 | }
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[83] | 101 |
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[71] | 102 | } else {
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| 103 | # normal ascii character
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[73] | 104 | push (@outtext, $c1) if ($c1 < 0x80);
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[71] | 105 | $i++;
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| 106 | }
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| 107 | }
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[83] | 108 |
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[71] | 109 | return \@outtext;
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| 110 | }
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| 111 |
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| 112 |
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[83] | 113 | # unicode2gb uses the GBK translation table
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[71] | 114 | sub unicode2gb {
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[83] | 115 | generalunicode2gb ("GBK", @_);
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[71] | 116 | }
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| 117 |
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| 118 | # returns a gb string. Note that this will not translate
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| 119 | # traditional forms of characters to their simplified forms
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| 120 | # Any traditional characters in the unicode will not be translated
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| 121 | sub generalunicode2gb {
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| 122 | my ($encoding, $intext) = @_;
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| 123 |
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| 124 | # load the encoding (if it is not already loaded)
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[92] | 125 | if (!&loadmapencoding ("unicode-$encoding")) {
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[71] | 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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[83] | 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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[71] | 144 | }
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| 145 | }
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| 146 |
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| 147 | return $outtext;
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| 148 | }
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| 149 |
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| 150 |
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[92] | 151 | # It returns 1 if successful, 0 if unsuccessful
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| 152 | sub loadmapencoding {
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| 153 | my ($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/$filename");
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[1218] | 165 | binmode (MAPFILE); # f$#@!!! windows
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[92] | 166 |
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| 167 | $translations{$encoding} = [@array256];
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| 168 | my $block = $translations{$encoding};
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| 169 |
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| 170 | my ($in,$i,$j);
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| 171 | while (read(MAPFILE, $in, 1) == 1) {
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| 172 | $i = unpack ("C", $in);
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| 173 | $block->[$i] = [@array256];
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| 174 | for ($j=0; $j<256 && read(MAPFILE, $in, 2)==2; $j++) {
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| 175 | my ($n1, $n2) = unpack ("CC", $in);
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| 176 | $block->[$i]->[$j] = ($n1*256) + $n2;
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| 177 | }
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| 178 | }
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| 179 |
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| 180 | close (MAPFILE);
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| 181 | }
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| 182 |
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| 183 |
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| 184 |
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| 185 | # loadencoding expects the mapfile to contain (at least) two
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[71] | 186 | # tab-seperated fields. The first field is the mapped value
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| 187 | # and the second field is the unicode value.
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| 188 | #
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| 189 | # It returns 1 if successful, 0 if unsuccessful
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| 190 | sub loadencoding {
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| 191 | my ($encoding, $mapfile) = @_;
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| 192 |
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| 193 | my $to = "$encoding-unicode";
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| 194 | my $from = "unicode-$encoding";
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| 195 |
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| 196 | # check to see if the encoding has already been loaded
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| 197 | if (defined $translations{$to} && defined $translations{$from}) {
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| 198 | return 1;
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| 199 | }
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| 200 |
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| 201 | return 0 unless open (MAPFILE, $mapfile);
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| 202 |
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| 203 | my ($line, @line);
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| 204 | $translations{$to} = [@array256];
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| 205 | $translations{$from} = [@array256];
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| 206 | while (defined ($line = <MAPFILE>)) {
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| 207 | # remove comments
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| 208 | $line =~ s/\#.*$//;
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| 209 | next unless $line =~ /\S/;
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| 210 |
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| 211 | # split the line into fields and do a few
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| 212 | # simple sanity checks
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| 213 | @line = split (/\t/, $line);
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| 214 | next unless (scalar(@line) >= 2 &&
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| 215 | $line[0] =~ /^0x/ &&
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| 216 | $line[1] =~ /^0x/);
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| 217 |
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[83] | 218 | my $gbc = hex($line[0]);
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| 219 | my $unic = hex($line[1]);
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| 220 |
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| 221 | # gbk has already had the necessary most significant
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| 222 | # bits set (it is used in the encoding
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| 223 | $gbc = $gbc | 0x8080 unless ($encoding =~ /gbk/i);
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| 224 |
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| 225 | &addchartrans ($translations{$to}, $gbc, $unic);
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| 226 | &addchartrans ($translations{$from}, $unic, $gbc);
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[71] | 227 | }
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| 228 |
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| 229 | close (MAPFILE);
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| 230 |
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| 231 | return 1;
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| 232 | }
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| 233 |
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| 234 | sub showfilled {
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| 235 | my ($block) = @_;
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| 236 | my $count = 0;
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| 237 | foreach $el (@$block) {
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| 238 | if (ref ($el) eq "ARRAY") {
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| 239 | print "1";
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| 240 | $count++;
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| 241 | } else {
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| 242 | print "0";
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| 243 | }
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| 244 | }
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| 245 | print "\n";
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| 246 | print "total: $count\n";
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| 247 | }
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| 248 |
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| 249 |
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| 250 | # addchartrans adds one character translation to a translation block.
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| 251 | # It also simplifies the translation block if possible.
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| 252 | sub addchartrans {
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| 253 | my ($block, $from, $to) = @_;
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| 254 | my $i = 0;
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| 255 |
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| 256 | my $high = ($from / 256) % 256;
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| 257 | my $low = $from % 256;
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| 258 |
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| 259 | if (ref ($block->[$high]) ne "ARRAY") {
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| 260 | $block->[$high] = [@array256];
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| 261 | }
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| 262 | $block->[$high]->[$low] = $to;
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| 263 | }
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| 264 |
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| 265 |
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| 266 | sub transchar {
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| 267 | my ($encoding, $from) = @_;
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| 268 | my $high = ($from / 256) % 256;
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| 269 | my $low = $from % 256;
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| 270 |
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| 271 | return 0 unless defined $translations{$encoding};
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| 272 |
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| 273 | my $block = $translations{$encoding};
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| 274 |
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| 275 | if (ref ($block->[$high]) ne "ARRAY") {
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| 276 | return 0;
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| 277 | }
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| 278 | return $block->[$high]->[$low];
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| 279 | }
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| 280 |
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| 281 |
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| 282 | 1;
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