#! /usr/bin/perl
#
# Copyright (c) 2001-2025, PostgreSQL Global Development Group
#
# src/backend/utils/mb/Unicode/UCS_to_most.pl
#
# Generate UTF-8 <--> character code conversion tables from
# map files provided by Unicode organization.
# Unfortunately it is prohibited by the organization
# to distribute the map files. So if you try to use this script,
# you have to obtain the map files from the organization's download site.
# https://www.unicode.org/Public/MAPPINGS/
# We assume the file include three tab-separated columns:
#		 source character set code in hex
#		 UCS-2 code in hex
#		 # and Unicode name (not used in this script)

use strict;
use warnings FATAL => 'all';

use convutils;

my $this_script = 'src/backend/utils/mb/Unicode/UCS_to_most.pl';

my %filename = (
	'WIN866' => 'CP866.TXT',
	'WIN874' => 'CP874.TXT',
	'WIN1250' => 'CP1250.TXT',
	'WIN1251' => 'CP1251.TXT',
	'WIN1252' => 'CP1252.TXT',
	'WIN1253' => 'CP1253.TXT',
	'WIN1254' => 'CP1254.TXT',
	'WIN1255' => 'CP1255.TXT',
	'WIN1256' => 'CP1256.TXT',
	'WIN1257' => 'CP1257.TXT',
	'WIN1258' => 'CP1258.TXT',
	'ISO8859_2' => '8859-2.TXT',
	'ISO8859_3' => '8859-3.TXT',
	'ISO8859_4' => '8859-4.TXT',
	'ISO8859_5' => '8859-5.TXT',
	'ISO8859_6' => '8859-6.TXT',
	'ISO8859_7' => '8859-7.TXT',
	'ISO8859_8' => '8859-8.TXT',
	'ISO8859_9' => '8859-9.TXT',
	'ISO8859_10' => '8859-10.TXT',
	'ISO8859_13' => '8859-13.TXT',
	'ISO8859_14' => '8859-14.TXT',
	'ISO8859_15' => '8859-15.TXT',
	'ISO8859_16' => '8859-16.TXT',
	'KOI8R' => 'KOI8-R.TXT',
	'KOI8U' => 'KOI8-U.TXT',
	'GBK' => 'CP936.TXT');

# make maps for all encodings if not specified
my @charsets = (scalar(@ARGV) > 0) ? @ARGV : sort keys(%filename);

# the sort is just so that the output is easier to eyeball
foreach my $charset (sort @charsets)
{
	my $mapping = &read_source($filename{$charset});

	print_conversion_tables($this_script, $charset, $mapping);
}
