#! /usr/bin/perl
#
# Copyright (c) 2001-2016, 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 ftp site.
# ftp://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)

require "ucs2utf.pl";

%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',
	'UHC'        => 'CP949.TXT',
	'JOHAB'      => 'JOHAB.TXT',);

@charsets = keys(%filename);
@charsets = @ARGV if scalar(@ARGV);
foreach $charset (@charsets)
{

	#
	# first, generate UTF8-> charset table
	#
	$in_file = $filename{$charset};

	open(FILE, $in_file) || die("cannot open $in_file");

	reset 'array';

	while (<FILE>)
	{
		chop;
		if (/^#/)
		{
			next;
		}
		($c, $u, $rest) = split;
		$ucs  = hex($u);
		$code = hex($c);
		if ($code >= 0x80 && $ucs >= 0x0080)
		{
			$utf = &ucs2utf($ucs);
			if ($array{$utf} ne "")
			{
				printf STDERR "Warning: duplicate UTF8: %04x\n", $ucs;
				next;
			}
			$count++;
			$array{$utf} = $code;
		}
	}
	close(FILE);

	$file = lc("utf8_to_${charset}.map");
	open(FILE, "> $file") || die("cannot open $file");

	print FILE "/* src/backend/utils/mb/Unicode/$file */\n\n";
	print FILE "static const pg_utf_to_local ULmap${charset}[ $count ] = {\n";

	for $index (sort { $a <=> $b } keys(%array))
	{
		$code = $array{$index};
		$count--;
		if ($count == 0)
		{
			printf FILE "  {0x%04x, 0x%04x}\n", $index, $code;
		}
		else
		{
			printf FILE "  {0x%04x, 0x%04x},\n", $index, $code;
		}
	}

	print FILE "};\n";
	close(FILE);

	#
	# then generate character set code ->UTF8 table
	#
	open(FILE, $in_file) || die("cannot open $in_file");

	reset 'array';

	while (<FILE>)
	{
		chop;
		if (/^#/)
		{
			next;
		}
		($c, $u, $rest) = split;
		$ucs  = hex($u);
		$code = hex($c);
		if ($code >= 0x80 && $ucs >= 0x0080)
		{
			$utf = &ucs2utf($ucs);
			if ($array{$code} ne "")
			{
				printf STDERR "Warning: duplicate UTF8: %04x\n", $ucs;
				next;
			}
			$count++;
			$array{$code} = $utf;
		}
	}
	close(FILE);

	$file = lc("${charset}_to_utf8.map");
	open(FILE, "> $file") || die("cannot open $file");

	print FILE "/* src/backend/utils/mb/Unicode/$file */\n\n";
	print FILE "static const pg_local_to_utf LUmap${charset}[ $count ] = {\n";
	for $index (sort { $a <=> $b } keys(%array))
	{
		$utf = $array{$index};
		$count--;
		if ($count == 0)
		{
			printf FILE "  {0x%04x, 0x%04x}\n", $index, $utf;
		}
		else
		{
			printf FILE "  {0x%04x, 0x%04x},\n", $index, $utf;
		}
	}

	print FILE "};\n";
	close(FILE);
}
