#! /usr/bin/perl
#
# Copyright (c) 2001-2015, PostgreSQL Global Development Group
#
# src/backend/utils/mb/Unicode/UCS_to_SJIS.pl
#
# Generate UTF-8 <--> SJIS 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 SHIFTJIS.TXT from
# the organization's ftp site.
#
# SHIFTJIS.TXT format:
#		 SHIFTJIS code in hex
#		 UCS-2 code in hex
#		 # and Unicode name (not used in this script)
# Warning: SHIFTJIS.TXT contains only JIS0201 and JIS0208. no JIS0212.

require "ucs2utf.pl";

# first generate UTF-8 --> SJIS table

$in_file = "CP932.TXT";
$count   = 0;

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

while (<FILE>)
{
	chop;
	if (/^#/)
	{
		next;
	}
	($c, $u, $rest) = split;
	$ucs  = hex($u);
	$code = hex($c);
	if ($code >= 0x80 && $ucs >= 0x0080)
	{
		$utf = &ucs2utf($ucs);
		if ((($code >= 0xed40) && ($code <= 0xeefc))
			|| (   ($code >= 0x8754)
				&& ($code <= 0x875d))
			|| ($code == 0x878a)
			|| ($code == 0x8782)
			|| ($code == 0x8784)
			|| ($code == 0xfa5b)
			|| ($code == 0xfa54)
			|| (   ($code >= 0x8790)
				&& ($code <= 0x8792))
			|| (   ($code >= 0x8795)
				&& ($code <= 0x8797))
			|| (   ($code >= 0x879a)
				&& ($code <= 0x879c)))
		{
			printf STDERR
			  "Warning: duplicate UTF8 : UCS=0x%04x  SJIS=0x%04x\n", $ucs,
			  $code;
			next;
		}
		$count++;
		$array{$utf} = $code;
	}
}

close(FILE);

#
# first, generate UTF8 --> SJIS table
#

$file = "utf8_to_sjis.map";
open(FILE, "> $file") || die("cannot open $file");
print FILE "static const pg_utf_to_local ULmapSJIS[ $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 SJIS --> UTF8 table
#

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

reset 'array';
$count = 0;

while (<FILE>)
{
	chop;
	if (/^#/)
	{
		next;
	}
	($c, $u, $rest) = split;
	$ucs  = hex($u);
	$code = hex($c);
	if ($code >= 0x80 && $ucs >= 0x0080)
	{
		$utf = &ucs2utf($ucs);
		$count++;

		$array{$code} = $utf;
	}
}
close(FILE);

$file = "sjis_to_utf8.map";
open(FILE, "> $file") || die("cannot open $file");
print FILE "static const pg_local_to_utf LUmapSJIS[ $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);
