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<?php
namespace Nextend\Framework\Misc\Base64;
class Decoder {
public static function decode($data) {
if (function_exists('base64_decode')) {
return base64_decode($data);
}
return self::decodeShim($data);
}
private static function decodeShim($input) {
$keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
$i = 0;
$output = "";
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
$filter = $input;
$input = preg_replace("[^A-Za-z0-9\+\/\=]", "", $input);
if ($filter != $input) {
return false;
}
do {
$enc1 = strpos($keyStr, substr($input, $i++, 1));
$enc2 = strpos($keyStr, substr($input, $i++, 1));
$enc3 = strpos($keyStr, substr($input, $i++, 1));
$enc4 = strpos($keyStr, substr($input, $i++, 1));
$chr1 = ($enc1 << 2) | ($enc2 >> 4);
$chr2 = (($enc2 & 15) << 4) | ($enc3 >> 2);
$chr3 = (($enc3 & 3) << 6) | $enc4;
$output = $output . chr((int)$chr1);
if ($enc3 != 64) {
$output = $output . chr((int)$chr2);
}
if ($enc4 != 64) {
$output = $output . chr((int)$chr3);
}
} while ($i < strlen($input));
return urldecode($output);
}
}