mirror of
https://github.com/ezyang/htmlpurifier.git
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4a724d0230
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@510 48356398-32a2-884e-a903-53898d9a118a
47 lines
1.3 KiB
PHP
47 lines
1.3 KiB
PHP
<?php
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/**
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* Class that handles operations involving percent-encoding in URIs.
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*/
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class HTMLPurifier_PercentEncoder
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{
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/**
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* Fix up percent-encoding by decoding unreserved characters and normalizing
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* @param $string String to normalize
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*/
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function normalize($string) {
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if ($string == '') return '';
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$parts = explode('%', $string);
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$ret = array_shift($parts);
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foreach ($parts as $part) {
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$length = strlen($part);
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if ($length < 2) {
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$ret .= '%25' . $part;
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continue;
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}
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$encoding = substr($part, 0, 2);
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$text = substr($part, 2);
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if (!ctype_xdigit($encoding)) {
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$ret .= '%25' . $part;
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continue;
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}
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$int = hexdec($encoding);
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if (
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($int >= 48 && $int <= 57) || // digits
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($int >= 65 && $int <= 90) || // uppercase letters
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($int >= 97 && $int <= 122) || // lowercase letters
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$int == 126 || $int == 45 || $int == 46 || $int == 95 // ~-._
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) {
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$ret .= chr($int) . $text;
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continue;
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}
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$encoding = strtoupper($encoding);
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$ret .= '%' . $encoding . $text;
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}
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return $ret;
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}
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}
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?>
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