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<?php |
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/** |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* You should have received a copy of the GNU General Public License |
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* along with this program (see LICENSE.txt in the base directory. If |
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* not, see:. |
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* |
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* @link <http://www.gnu.org/licenses/>. |
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* |
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* @author niel |
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* @copyright 2016 nZEDb |
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*/ |
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namespace App\Extensions\util; |
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/** |
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* Class Php. |
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*/ |
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class PhpYenc |
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{ |
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public static function decode(&$text, bool $ignore = false): bool|string |
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{ |
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$crc = ''; |
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// Extract the yEnc string itself. |
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if (preg_match( |
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'/=ybegin.*size=([^ $]+).*\\r\\n(.*)\\r\\n=yend.*size=([^ $\\r\\n]+)(.*)/ims', |
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$text, |
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$encoded |
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)) { |
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if (preg_match('/crc32=([^ $\\r\\n]+)/ims', $encoded[4], $trailer)) { |
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$crc = trim($trailer[1]); |
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} |
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[$headerSize, $encoded, $trailerSize] = $encoded; |
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} else { |
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return false; |
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} |
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// Remove line breaks from the string. |
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$encoded = trim(str_replace("\r\n", '', $encoded)); |
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// Make sure the header and trailer file sizes match up. |
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if ($headerSize !== $trailerSize) { |
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$message = 'Header and trailer file sizes do not match. This is a violation of the yEnc specification.'; |
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throw new \RuntimeException($message); |
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} |
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// Decode. |
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$decoded = ''; |
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$encodedLength = \strlen($encoded); |
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for ($chr = 0; $chr < $encodedLength; $chr++) { |
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$decoded .= ( |
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$encoded[$chr] === '=' ? |
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\chr((\ord($encoded[$chr]) - 42) % 256) : |
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\chr((((\ord($encoded[++$chr]) - 64) % 256) - 42) % 256) |
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); |
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} |
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// Make sure the decoded file size is the same as the size specified in the header. |
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if (\strlen($decoded) !== $headerSize) { |
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$message = 'Header file size ('.$headerSize.') and actual file size ('.\strlen($decoded).') do not match. The file is probably corrupt.'; |
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throw new \RuntimeException($message); |
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} |
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// Check the CRC value |
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if ($crc !== '' && (strtolower($crc) !== strtolower(sprintf('%04X', crc32($decoded))))) { |
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$message = 'CRC32 checksums do not match. The file is probably corrupt.'; |
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throw new \RuntimeException($message); |
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} |
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return $decoded; |
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} |
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/** |
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* Decode a string of text encoded with yEnc. Ignores all errors. |
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* |
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* @param string $text The encoded text to decode. |
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* @return string The decoded yEnc string, or the input string, if it's not yEnc. |
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*/ |
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public static function decodeIgnore(string &$text): string |
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{ |
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if (preg_match('/^(=yBegin.*=yEnd[^$]*)$/ims', $text, $input)) { |
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$text = ''; |
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$input = |
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trim( |
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preg_replace( |
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'/\r\n/im', |
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'', |
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preg_replace( |
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'/(^=yEnd.*)/im', |
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'', |
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preg_replace( |
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'/(^=yPart.*\\r\\n)/im', |
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'', |
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preg_replace('/(^=yBegin.*\\r\\n)/im', '', $input[1], 1), |
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1 |
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), |
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1 |
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) |
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) |
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); |
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$length = \strlen($input); |
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for ($chr = 0; $chr < $length; $chr++) { |
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$text .= ( |
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$input[$chr] === '=' ? |
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\chr((((\ord($input[++$chr]) - 64) % 256) - 42) % 256) : |
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\chr((\ord($input[$chr]) - 42) % 256) |
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); |
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} |
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} |
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return $text; |
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} |
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public static function enabled(): bool |
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{ |
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return true; |
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} |
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public static function encode($data, $filename, int $lineLength = 128, bool $crc32 = true): string |
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{ |
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// yEnc 1.3 draft doesn't allow line lengths of more than 254 bytes. |
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if ($lineLength > 254) { |
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$lineLength = 254; |
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} |
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if ($lineLength < 1) { |
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$message = $lineLength.' is not a valid line length.'; |
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throw new \RuntimeException($message); |
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} |
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$encoded = ''; |
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$stringLength = \strlen($data); |
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// Encode each character of the string one at a time. |
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foreach ($data as $i => $iValue) { |
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$value = ((\ord($iValue) + 42) % 256); |
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// Escape NULL, TAB, LF, CR, space, . and = characters. |
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$encoded .= match ($value) { |
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0, 10, 13, 61 => ('='.\chr(($value + 64) % 256)), |
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default => \chr($value), |
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}; |
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} |
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$encoded = |
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'=ybegin line='. |
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$lineLength. |
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' size='. |
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$stringLength. |
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' name='. |
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trim($filename). |
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"\r\n". |
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trim(chunk_split($encoded, $lineLength)). |
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"\r\n=yend size=". |
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$stringLength; |
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// Add a CRC32 checksum if desired. |
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if ($crc32 === true) { |
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$encoded .= ' crc32='.strtolower(sprintf('%X', crc32($data))); |
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} |
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return $encoded; |
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} |
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} |
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NNTmux /
newznab-tmux
This check looks for parameters that have been defined for a function or method, but which are not used in the method body.