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<?php declare(strict_types=1); |
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/** |
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* @package s9e\Bencode |
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* @copyright Copyright (c) 2014-2020 The s9e authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\Bencode; |
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use ArrayObject; |
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use InvalidArgumentException; |
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use stdClass; |
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class Encoder |
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{ |
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public static function encode($value): string |
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{ |
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if (is_scalar($value)) |
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{ |
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return self::encodeScalar($value); |
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} |
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if (is_array($value)) |
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{ |
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return self::encodeArray($value); |
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} |
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if ($value instanceof stdClass) |
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{ |
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$value = new ArrayObject(get_object_vars($value)); |
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} |
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if ($value instanceof ArrayObject) |
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{ |
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return self::encodeArrayObject($value); |
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} |
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throw new InvalidArgumentException('Unsupported value'); |
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} |
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/** |
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* Encode an array into either an array of a dictionary |
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*/ |
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protected static function encodeArray(array $value): string |
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{ |
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if (empty($value)) |
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{ |
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return 'le'; |
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} |
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if (array_keys($value) === range(0, count($value) - 1)) |
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{ |
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return 'l' . implode('', array_map([__CLASS__, 'encode'], $value)) . 'e'; |
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} |
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// Encode associative arrays as dictionaries |
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return self::encodeArrayObject(new ArrayObject($value)); |
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} |
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/** |
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* Encode given ArrayObject instance into a dictionary |
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*/ |
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protected static function encodeArrayObject(ArrayObject $dict): string |
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{ |
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$vars = $dict->getArrayCopy(); |
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ksort($vars); |
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$str = 'd'; |
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foreach ($vars as $k => $v) |
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{ |
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$str .= strlen($k) . ':' . $k . self::encode($v); |
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} |
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$str .= 'e'; |
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return $str; |
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} |
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/** |
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* Encode a scalar value |
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*/ |
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protected static function encodeScalar($value): string |
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{ |
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if (is_int($value) || is_float($value)) |
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{ |
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return sprintf('i%de', round($value)); |
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} |
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if (is_bool($value)) |
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{ |
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return ($value) ? 'i1e' : 'i0e'; |
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} |
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return strlen($value) . ':' . $value; |
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} |
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} |
s9e /
Bencode
