<?php
/**
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program (see LICENSE.txt in the base directory.  If
 * not, see:.
 *
 * @link      <http://www.gnu.org/licenses/>.
 * @author    niel
 * @copyright 2016 nZEDb
 */

namespace App\Extensions\util\yenc\adapter;

use App\Extensions\util\Yenc;

class Ydecode
{
    /**
     * Path to yyDecoder binary.
     *
     * @var bool|string
     */
    protected static $pathBin;

    /**
     * If on unix, hide yydecode CLI output.
     *
     * @var string
     */
    protected static $silent;

    public static function decode(&$text, $ignore = false)
    {
        $result = preg_match('/^(=yBegin.*=yEnd[^$]*)$/ims', $text, $input);
        switch (true) {
			case ! $result:
				throw new \RuntimeException('Text does not look like yEnc.');
			case self::$pathBin === false:
				throw new \InvalidArgumentException('No valid path to yydecoder binary found!');
			default:
		}

        $ignoreFlag = $ignore ? '-b ' : '';
        $data = shell_exec(
			"echo '{$input[1]}' | {".self::$pathBin.'} -o - '.$ignoreFlag.self::$silent
		);
        if ($data === null) {
            throw new \RuntimeException('Error getting data from yydecode.');
        }

        return $data;
    }

    public static function decodeIgnore(&$text)
    {
        self::decode($text, true);
    }

    /**
     * Determines if this adapter is enabled by checking if the `yydecode` path is enabled.
     *
     * @return bool Returns `true` if enabled, otherwise `false`.
     */
    public static function enabled()
    {
        return ! empty(self::$pathBin);
    }

    public static function encode($data, $filename, $lineLength, $crc32)
    {
        return Yenc::encode($data, $filename, $lineLength, $crc32, ['name' => 'Php']);
    }
}