1#! /usr/bin/perl
2#
3# Copyright (c) 2001-2020, PostgreSQL Global Development Group
4#
5# src/backend/utils/mb/Unicode/UCS_to_BIG5.pl
6#
7# Generate UTF-8 <--> BIG5 conversion tables from
8# map files provided by Unicode organization.
9# Unfortunately it is prohibited by the organization
10# to distribute the map files. So if you try to use this script,
11# you have to obtain the map files from the organization's download site.
12# https://www.unicode.org/Public/MAPPINGS/
13#
14# Our "big5" comes from BIG5.TXT, with the addition of the characters
15# in the range 0xf9d6-0xf9dc from CP950.TXT.
16#
17# BIG5.TXT format:
18#		 BIG5 code in hex
19#		 UCS-2 code in hex
20#		 # and Unicode name (not used in this script)
21#
22# CP950.TXT format:
23#		 CP950 code in hex
24#		 UCS-2 code in hex
25#		 # and Unicode name (not used in this script)
26
27use strict;
28use warnings;
29
30use convutils;
31
32my $this_script = 'src/backend/utils/mb/Unicode/UCS_to_BIG5.pl';
33
34# Load BIG5.TXT
35my $all = &read_source("BIG5.TXT");
36
37# Load CP950.TXT
38my $cp950txt = &read_source("CP950.TXT");
39
40foreach my $i (@$cp950txt)
41{
42	my $code = $i->{code};
43	my $ucs  = $i->{ucs};
44
45	# Pick only the ETEN extended characters in the range 0xf9d6 - 0xf9dc
46	# from CP950.TXT
47	if (   $code >= 0x80
48		&& $ucs >= 0x0080
49		&& $code >= 0xf9d6
50		&& $code <= 0xf9dc)
51	{
52		push @$all,
53		  {
54			code      => $code,
55			ucs       => $ucs,
56			comment   => $i->{comment},
57			direction => BOTH,
58			f         => $i->{f},
59			l         => $i->{l}
60		  };
61	}
62}
63
64foreach my $i (@$all)
65{
66	my $code = $i->{code};
67	my $ucs  = $i->{ucs};
68
69	# BIG5.TXT maps several BIG5 characters to U+FFFD. The UTF-8 to BIG5 mapping can
70	# contain only one of them. XXX: Doesn't really make sense to include any of them,
71	# but for historical reasons, we map the first one of them.
72	if ($i->{ucs} == 0xFFFD && $i->{code} != 0xA15A)
73	{
74		$i->{direction} = TO_UNICODE;
75	}
76}
77
78# Output
79print_conversion_tables($this_script, "BIG5", $all);
80