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[1.2.0] Added percent encoding normalization

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git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@509 48356398-32a2-884e-a903-53898d9a118a
This commit is contained in:
Edward Z. Yang
2006-11-07 17:15:28 +00:00
parent e998b034d1
commit 504203c0f3
6 changed files with 99 additions and 5 deletions
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44
library/HTMLPurifier/PercentEncoder.php Normal file
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@@ -0,0 +1,44 @@
<?php
class HTMLPurifier_PercentEncoder
{
/**
* Fix up percent-encoding by decoding unreserved characters and normalizing
* @param $string String to normalize
*/
function normalize($string) {
if ($string == '') return '';
$parts = explode('%', $string);
$ret = array_shift($parts);
foreach ($parts as $part) {
$length = strlen($part);
if ($length < 2) {
$ret .= '%25' . $part;
continue;
}
$encoding = substr($part, 0, 2);
$text = substr($part, 2);
if (!ctype_xdigit($encoding)) {
$ret .= '%25' . $part;
continue;
}
$int = hexdec($encoding);
if (
($int >= 48 && $int <= 57) || // digits
($int >= 65 && $int <= 90) || // uppercase letters
($int >= 97 && $int <= 122) || // lowercase letters
$int == 126 || $int == 45 || $int == 46 || $int == 95 // ~-._
) {
$ret .= chr($int) . $text;
continue;
}
$encoding = strtoupper($encoding);
$ret .= '%' . $encoding . $text;
}
return $ret;
}
}
?>