/usr/share/php/Patchwork/Utf8/BestFit.php is in php-patchwork-utf8 1.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* Copyright (C) 2016 Nicolas Grekas - p@tchwork.com
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the (at your option):
* Apache License v2.0 (http://apache.org/licenses/LICENSE-2.0.txt), or
* GNU General Public License v2.0 (http://gnu.org/licenses/gpl-2.0.txt).
*/
namespace Patchwork\Utf8;
/**
* UTF-8 to Code Page conversion using best fit mappings
* See http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WindowsBestFit/.
*/
class BestFit
{
public static function fit($cp, $s, $placeholder = '?')
{
if (!$len = strlen($s)) {
return 0 === $len ? '' : false;
}
static $map = array();
static $ulen_mask = array("\xC0" => 2, "\xD0" => 2, "\xE0" => 3, "\xF0" => 4);
$s .= '';
$cp = (string) (int) $cp;
$result = '9' === $cp[0] ? $s.$s : $s;
if ('932' === $cp && 2 === func_num_args()) {
$placeholder = "\x81\x45"; // Katakana Middle Dot in CP932
}
if (!isset($map[$cp])) {
$i = static::getData('to.bestfit'.$cp);
if (false === $i) {
return false;
}
$map[$cp] = $i;
}
$i = $j = 0;
$cp = $map[$cp];
while ($i < $len) {
if ($s[$i] < "\x80") {
$uchr = $s[$i++];
} else {
$ulen = $ulen_mask[$s[$i] & "\xF0"];
$uchr = substr($s, $i, $ulen);
$i += $ulen;
}
if (isset($cp[$uchr])) {
$uchr = $cp[$uchr];
} else {
$uchr = $placeholder;
}
isset($uchr[0]) and $result[$j++] = $uchr[0];
isset($uchr[1]) and $result[$j++] = $uchr[1];
}
return substr($result, 0, $j);
}
protected static function getData($file)
{
$file = __DIR__.'/../../data/Patchwork/data/'.$file.'.ser';
if (file_exists($file)) {
return unserialize(file_get_contents($file));
} else {
return false;
}
}
}
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