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<?php |
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/** |
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* Game-Insight |
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* |
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* @package Game-Insight/torrent |
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* @author Ilya Gusev <[email protected]> |
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* @copyright Copyright (c) 2015 |
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* @link https://github.com/Game-Insight/torrent |
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* @created 15.03.2015 03:16 |
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*/ |
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namespace League\Torrent\Helper; |
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/** |
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* Class Decoder |
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* |
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* @todo: validations for decoders |
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* @package League\Torrent\Helper |
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*/ |
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class Decoder |
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{ |
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/** |
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* @param $data |
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* |
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* @return array|bool|int|string |
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*/ |
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public static function decodeData(& $data) |
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{ |
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switch (FileSystem::char($data)) { |
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case 'i': |
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$data = substr($data, 1); |
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return self::decodeInteger($data); |
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case 'l': |
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$data = substr($data, 1); |
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return self::decodeList($data); |
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case 'd': |
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$data = substr($data, 1); |
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return self::decodeDictionary($data); |
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default: |
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return self::decodeString($data); |
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} |
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} |
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/** |
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* @param $data |
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* |
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* @return array|bool |
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*/ |
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public static function decodeDictionary(& $data) |
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{ |
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$dictionary = array(); |
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while (($char = FileSystem::char($data)) != 'e') { |
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$key = self::decodeString($data); |
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$dictionary[$key] = self::decodeData($data); |
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} |
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$data = substr($data, 1); |
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return $dictionary; |
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} |
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/** |
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* @param $data |
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* |
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* @return array|bool |
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*/ |
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public static function decodeList(& $data) |
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{ |
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$list = array(); |
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while (($char = FileSystem::char($data)) != 'e') { |
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$list[] = self::decodeData($data); |
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} |
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$data = substr($data, 1); |
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return $list; |
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} |
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/** |
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* @param $data |
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* |
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* @return bool|string |
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*/ |
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public static function decodeString(& $data) |
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{ |
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$colon = strpos($data, ':'); |
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$length = intval(substr($data, 0, $colon)); |
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$string = substr($data, $colon + 1, $length); |
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$data = substr($data, $colon + $length + 1); |
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return $string; |
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} |
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/** |
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* @param $data |
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* |
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* @return int |
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*/ |
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public static function decodeInteger(& $data) |
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{ |
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$start = 0; |
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$end = strpos($data, 'e'); |
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if (FileSystem::char($data) == '-') { |
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$start++; |
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} |
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$integer = (int) substr($data, 0, $end); |
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$data = substr($data, $end + 1); |
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return 0 + $integer; |
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} |
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/** |
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* @param $string |
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* |
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* @return array |
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*/ |
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public static function decode($string) |
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{ |
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if (is_file($string)) { |
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$data = file_get_contents($string); |
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} elseif (FileSystem::url_exists($string)) { |
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$data = FileSystem::downloadTorrent($string); |
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} else { |
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$data = $string; |
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} |
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return (array) Decoder::decodeData($data); |
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} |
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} |
iGusev /
torrent
