Xml.php
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<?php // vi: set fenc=utf-8 ts=4 sw=4 et:
/*
* Copyright (C) 2013 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\PHP\Shim;
/**
* utf8_encode/decode
*/
class Xml
{
static function utf8_encode($s)
{
$len = strlen($s);
$e = $s . $s;
for ($i = 0, $j = 0; $i < $len; ++$i, ++$j) switch (true)
{
case $s[$i] < "\x80": $e[$j] = $s[$i]; break;
case $s[$i] < "\xC0": $e[$j] = "\xC2"; $e[++$j] = $s[$i]; break;
default: $e[$j] = "\xC3"; $e[++$j] = chr(ord($s[$i]) - 64); break;
}
return substr($e, 0, $j);
}
static function utf8_decode($s)
{
$len = strlen($s);
for ($i = 0, $j = 0; $i < $len; ++$i, ++$j)
{
switch ($s[$i] & "\xF0")
{
case "\xC0":
case "\xD0":
$c = (ord($s[$i] & "\x1F") << 6) | ord($s[++$i] & "\x3F");
$s[$j] = $c < 256 ? chr($c) : '?';
break;
case "\xF0": ++$i;
case "\xE0":
$s[$j] = '?';
$i += 2;
break;
default:
$s[$j] = $s[$i];
}
}
return substr($s, 0, $j);
}
}