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<?php

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namespace Nextend\Framework\Misc\Base64;

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class Decoder {

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public static function decode($data) {

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if (function_exists('base64_decode')) {

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return base64_decode($data);

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}

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return self::decodeShim($data);

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}

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private static function decodeShim($input) {

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$keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

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$i = 0;

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$output = "";

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// remove all characters that are not A-Z, a-z, 0-9, +, /, or =

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$filter = $input;

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$input = preg_replace("[^A-Za-z0-9\+\/\=]", "", $input);

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if ($filter != $input) {

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return false;

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}

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do {

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$enc1 = strpos($keyStr, substr($input, $i++, 1));

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$enc2 = strpos($keyStr, substr($input, $i++, 1));

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$enc3 = strpos($keyStr, substr($input, $i++, 1));

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$enc4 = strpos($keyStr, substr($input, $i++, 1));

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$chr1 = ($enc1 << 2) | ($enc2 >> 4);

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$chr2 = (($enc2 & 15) << 4) | ($enc3 >> 2);

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$chr3 = (($enc3 & 3) << 6) | $enc4;

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$output = $output . chr((int)$chr1);

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if ($enc3 != 64) {

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$output = $output . chr((int)$chr2);

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}

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if ($enc4 != 64) {

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$output = $output . chr((int)$chr3);

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}

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} while ($i < strlen($input));

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return urldecode($output);

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}

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}

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