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#!/usr/bin/perl
#
# Produce a codepage matching table. For each 8-bit character, list
# a primary and an alternate match (the latter used for case-insensitive
# matching.)
#
# Usage:
# cptable.pl UnicodeData cpXXX.txt cpXXX.bin
#
($ucd, $cpin, $cpout) = @ARGV;
%altcase = ();
open(UCD, '<', $ucd) or die;
while (defined($line = <UCD>)) {
chomp $line;
@f = split(/;/, $line);
if ($f[12] ne '') {
$altcase{hex $f[0]} = hex $f[12]; # Upper case equivalent
} elsif ($f[13] ne '') {
$altcase{hex $f[0]} = hex $f[13]; # Lower case equivalent
} elsif ($f[14] ne '') {
$altcase{hex $f[0]} = hex $f[14]; # Title case, would be unusual
} else {
$altcase{hex $f[0]} = hex $f[0];
}
}
close(UCD);
@xtab = (undef) x 256;
open(CPIN, '<', $cpin) or die;
while (defined($line = <CPIN>)) {
$line =~ s/\s*(\#.*|)$//;
@f = split(/\s+/, $line);
next if (scalar @f != 2);
next if (hex $f[0] > 255);
$xtab[hex $f[0]] = hex $f[1];
}
close(CPIN);
open(CPOUT, '>', $cpout) or die;
for ($i = 0; $i < 256; $i++) {
if (!defined($xtab[$i])) {
$p0 = $p1 = 0xffff;
} else {
$p0 = $xtab[$i];
$p1 = defined($altcase{$p0}) ? $altcase{$p0} : $p0;
}
# Only the BMP is supported...
$p0 = 0xffff if ($p0 > 0xffff);
$p1 = 0xffff if ($p1 > 0xffff);
print CPOUT pack("vv", $p0, $p1);
}
close (CPOUT);
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