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<?php
namespace Nextend\Framework\Misc\Base64;
class Encoder {
public static function encode($data) {
if (function_exists('base64_encode')) {
return base64_encode($data);
}
return self::encodeShim($data);
}
private static function encodeShim($data) {
$b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
$o1 = $o2 = $o3 = $h1 = $h2 = $h3 = $h4 = $bits = $i = 0;
$ac = 0;
$enc = '';
$tmp_arr = array();
if (!$data) {
return $data;
}
do {
// pack three octets into four hexets
$o1 = self::charCodeAt($data, $i++);
$o2 = self::charCodeAt($data, $i++);
$o3 = self::charCodeAt($data, $i++);
$bits = $o1 << 16 | $o2 << 8 | $o3;
$h1 = $bits >> 18 & 0x3f;
$h2 = $bits >> 12 & 0x3f;
$h3 = $bits >> 6 & 0x3f;
$h4 = $bits & 0x3f;
// use hexets to index into b64, and append result to encoded string
$tmp_arr[$ac++] = self::charAt($b64, $h1) . self::charAt($b64, $h2) . self::charAt($b64, $h3) . self::charAt($b64, $h4);
} while ($i < strlen($data));
$enc = implode('', $tmp_arr);
$r = (strlen($data) % 3);
return ($r ? substr($enc, 0, ($r - 3)) . substr('===', $r) : $enc);
}
private static function charCodeAt($data, $char) {
return ord(substr($data, $char, 1));
}
private static function charAt($data, $char) {
return substr($data, $char, 1);
}
}