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<?php |
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namespace wapmorgan\UnifiedArchive\Drivers\OneFile; |
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use Exception; |
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use wapmorgan\UnifiedArchive\Exceptions\ArchiveExtractionException; |
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use wapmorgan\UnifiedArchive\Formats; |
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class Gzip extends OneFileDriver |
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{ |
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const EXTENSION_NAME = 'zlib'; |
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const FORMAT = Formats::GZIP; |
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/** |
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* @inheritDoc |
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1 |
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*/ |
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public static function getDescription() |
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{ |
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return 'adapter for ext-zlib'.(defined('ZLIB_VERSION') ? ' ('.ZLIB_VERSION.')' : null); |
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} |
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/** |
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* @param string $file GZipped file |
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* @return array|false Array with 'mtime' and 'size' items |
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*/ |
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public static function gzipStat($file) |
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{ |
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$fp = fopen($file, 'rb'); |
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if (filesize($file) < 18 || strcmp(fread($fp, 2), "\x1f\x8b")) { |
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return false; // Not GZIP format (See RFC 1952) |
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} |
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$method = fread($fp, 1); |
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$flags = fread($fp, 1); |
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$stat = unpack('Vmtime', fread($fp, 4)); |
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fseek($fp, -4, SEEK_END); |
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$stat += unpack('Vsize', fread($fp, 4)); |
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fclose($fp); |
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return $stat; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function __construct($archiveFileName, $format, $password = null) |
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{ |
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parent::__construct($archiveFileName, $format, $password); |
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$stat = static::gzipStat($archiveFileName); |
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if ($stat === false) { |
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throw new Exception('Could not open Gzip file'); |
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} |
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$this->uncompressedSize = $stat['size']; |
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$this->modificationTime = $stat['mtime']; |
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} |
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/** |
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* @param string $fileName |
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* |
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* @return string|false |
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*/ |
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public function getFileContent($fileName = null) |
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{ |
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return gzdecode(file_get_contents($this->fileName)); |
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} |
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/** |
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* @param string $fileName |
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* |
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* @return bool|resource|string |
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*/ |
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public function getFileStream($fileName = null) |
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{ |
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return gzopen($this->fileName, 'rb'); |
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} |
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/** |
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* @param $data |
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* @param $compressionLevel |
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* @return mixed|string |
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*/ |
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protected static function compressData($data, $compressionLevel) |
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{ |
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static $compressionLevelMap = [ |
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self::COMPRESSION_NONE => 0, |
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self::COMPRESSION_WEAK => 2, |
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self::COMPRESSION_AVERAGE => 4, |
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self::COMPRESSION_STRONG => 7, |
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self::COMPRESSION_MAXIMUM => 9, |
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]; |
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return gzencode($data, $compressionLevelMap[$compressionLevel]); |
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} |
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/** |
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* @param string $targetPath |
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*/ |
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public function streamToFile($targetPath) |
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{ |
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$sfp = gzopen($this->fileName, 'rb'); |
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$fp = fopen($targetPath, "w"); |
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while (!gzeof($sfp)) { |
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$chunk = gzread($sfp, 8192); |
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if($chunk === 0 || $chunk === false) |
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throw new ArchiveExtractionException('Cannot read gzip chunk'); |
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if(fwrite($fp, $chunk, strlen($chunk)) === false) |
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throw new ArchiveExtractionException('Cannot write gzip chunk'); |
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} |
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gzclose($sfp); |
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fclose($fp); |
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} |
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} |
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wapmorgan /
UnifiedArchive
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