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<?php

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namespace Nextend\Framework\Misc\Base64;

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class Encoder {

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public static function encode($data) {

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if (function_exists('base64_encode')) {

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return base64_encode($data);

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}

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return self::encodeShim($data);

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}

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private static function encodeShim($data) {

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$b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';

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$o1 = $o2 = $o3 = $h1 = $h2 = $h3 = $h4 = $bits = $i = 0;

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$ac = 0;

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$enc = '';

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$tmp_arr = array();

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if (!$data) {

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return $data;

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}

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do {

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// pack three octets into four hexets

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$o1 = self::charCodeAt($data, $i++);

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$o2 = self::charCodeAt($data, $i++);

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$o3 = self::charCodeAt($data, $i++);

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$bits = $o1 << 16 | $o2 << 8 | $o3;

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$h1 = $bits >> 18 & 0x3f;

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$h2 = $bits >> 12 & 0x3f;

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$h3 = $bits >> 6 & 0x3f;

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$h4 = $bits & 0x3f;

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// use hexets to index into b64, and append result to encoded string

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$tmp_arr[$ac++] = self::charAt($b64, $h1) . self::charAt($b64, $h2) . self::charAt($b64, $h3) . self::charAt($b64, $h4);

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

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$enc = implode('', $tmp_arr);

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$r = (strlen($data) % 3);

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return ($r ? substr($enc, 0, ($r - 3)) . substr('===', $r) : $enc);

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}

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private static function charCodeAt($data, $char) {

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return ord(substr($data, $char, 1));

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}

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private static function charAt($data, $char) {

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return substr($data, $char, 1);

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}

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}

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