Data
5 months ago
File
5 months ago
Header
5 months ago
Scan
5 months ago
.htaccess
5 months ago
Archive.php
5 months ago
Gzip.php
5 months ago
index.html
5 months ago
web.config
5 months ago
Gzip.php
195 lines
| 1 | <?php |
| 2 | |
| 3 | namespace JetBackup\Archive; |
| 4 | |
| 5 | use JetBackup\DirIterator\DirIteratorFile; |
| 6 | use JetBackup\Exception\GzipException; |
| 7 | |
| 8 | if (!defined( '__JETBACKUP__')) die('Direct access is not allowed'); |
| 9 | |
| 10 | /** |
| 11 | * Class for compressing files using gzip. |
| 12 | */ |
| 13 | class Gzip { |
| 14 | |
| 15 | const MAX_RETRIES = 3; |
| 16 | const RETRY_DELAY_MS = 100; |
| 17 | const DEFAULT_COMPRESS_CHUNK_SIZE = 10485760; // 10MB |
| 18 | const DEFAULT_DECOMPRESS_CHUNK_SIZE = 1048576; // 1MB |
| 19 | const DEFAULT_COMPRESSION_LEVEL = -1; |
| 20 | |
| 21 | private function __construct() {} |
| 22 | |
| 23 | /** |
| 24 | * @throws GzipException |
| 25 | */ |
| 26 | private static function _getInfo($file) { |
| 27 | $info = new \stdClass(); |
| 28 | if(file_exists($file)) { |
| 29 | $info = json_decode(file_get_contents($file)); |
| 30 | if($info === false) throw new GzipException("Failed fetching compress information"); |
| 31 | } |
| 32 | return $info; |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * @param $file |
| 37 | * @param $data |
| 38 | * |
| 39 | * @return void |
| 40 | * @throws GzipException |
| 41 | */ |
| 42 | private static function _putInfo($file, $data) |
| 43 | { |
| 44 | $tempFile = $file . '.tmp'; |
| 45 | |
| 46 | $jsonData = json_encode($data); |
| 47 | if ($jsonData === false) throw new GzipException("Failed to encode compress information: " . json_last_error_msg()); |
| 48 | |
| 49 | $maxRetries = self::MAX_RETRIES; |
| 50 | $retryDelayMs = self::RETRY_DELAY_MS; |
| 51 | $lastErrorWrite = null; |
| 52 | $bytesWritten = false; |
| 53 | |
| 54 | for ($i = 0; $i < $maxRetries; $i++) { |
| 55 | |
| 56 | $lastErrorWrite = null; |
| 57 | |
| 58 | set_error_handler(function ($severity, $message, $errFile, $errLine) use (&$lastErrorWrite) { |
| 59 | $lastErrorWrite = $message . " in {$errFile}:{$errLine}"; |
| 60 | return true; |
| 61 | }); |
| 62 | |
| 63 | $bytesWritten = @file_put_contents($tempFile, $jsonData); |
| 64 | restore_error_handler(); |
| 65 | |
| 66 | if ($bytesWritten !== false) break; |
| 67 | usleep($retryDelayMs * 1000); // retry |
| 68 | } |
| 69 | |
| 70 | if ($bytesWritten === false) { |
| 71 | $extra = $lastErrorWrite ? " ({$lastErrorWrite})" : ''; |
| 72 | throw new GzipException("Failed to write compress information to temporary file '{$tempFile}' after {$maxRetries} attempts{$extra}"); |
| 73 | } |
| 74 | |
| 75 | $lastErrorRename = null; |
| 76 | |
| 77 | for ($i = 0; $i < $maxRetries; $i++) { |
| 78 | |
| 79 | $lastErrorRename = null; |
| 80 | |
| 81 | set_error_handler(function ($severity, $message, $errFile, $errLine) use (&$lastErrorRename) { |
| 82 | $lastErrorRename = $message . " in {$errFile}:{$errLine}"; |
| 83 | return true; |
| 84 | }); |
| 85 | |
| 86 | $renamed = @rename($tempFile, $file); |
| 87 | restore_error_handler(); |
| 88 | |
| 89 | if ($renamed === true) return; |
| 90 | usleep($retryDelayMs * 1000); |
| 91 | } |
| 92 | |
| 93 | $extra = $lastErrorRename ? " ({$lastErrorRename})" : ''; |
| 94 | throw new GzipException("Failed to atomically write compress information to '{$file}' after {$maxRetries} attempts{$extra}"); |
| 95 | } |
| 96 | |
| 97 | |
| 98 | |
| 99 | /** |
| 100 | * @throws GzipException |
| 101 | */ |
| 102 | public static function compress($file, $chunkSize=self::DEFAULT_COMPRESS_CHUNK_SIZE, $compressionLevel=self::DEFAULT_COMPRESSION_LEVEL, ?callable $callback=null) { |
| 103 | if(!file_exists($file) || !is_file($file)) throw new GzipException("Source file not found"); |
| 104 | |
| 105 | $target = $file . '.gz'; |
| 106 | |
| 107 | $info_file = $target . '.compress.info'; |
| 108 | $info = self::_getInfo($info_file); |
| 109 | |
| 110 | $fd = fopen($file, 'r'); |
| 111 | $gzfd = fopen($target, 'ab'); |
| 112 | |
| 113 | $read = $write = 0; |
| 114 | if(isset($info->fdpos) && $info->fdpos) { |
| 115 | $read = $info->fdpos; |
| 116 | fseek($fd, $info->fdpos); |
| 117 | } |
| 118 | if(isset($info->fdgzpos) && $info->fdgzpos) { |
| 119 | $write = $info->fdgzpos; |
| 120 | fseek($gzfd, $info->fdgzpos); |
| 121 | } |
| 122 | |
| 123 | while(!feof($fd)) { |
| 124 | $write += fwrite($gzfd, gzencode(fread($fd, $chunkSize), $compressionLevel)); |
| 125 | $read += $chunkSize; |
| 126 | |
| 127 | self::_putInfo($info_file, [ |
| 128 | 'fdpos' => $read, |
| 129 | 'fdgzpos' => $write, |
| 130 | ]); |
| 131 | |
| 132 | if($callback) $callback($read, DirIteratorFile::safe_filesize($file)); |
| 133 | } |
| 134 | |
| 135 | if(feof($fd)) { |
| 136 | @unlink($file); |
| 137 | @unlink($info_file); |
| 138 | } |
| 139 | |
| 140 | fclose($fd); |
| 141 | fclose($gzfd); |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * @throws GzipException |
| 146 | */ |
| 147 | public static function decompress($file, ?callable $callback=null, $chunkSize=self::DEFAULT_DECOMPRESS_CHUNK_SIZE) { |
| 148 | if(!file_exists($file) || !is_file($file)) throw new GzipException("Source file not found"); |
| 149 | |
| 150 | $info_file = $file . '.decompress.info'; |
| 151 | $info = self::_getInfo($info_file); |
| 152 | |
| 153 | // remove .gz suffix |
| 154 | $target = substr($file, 0, -3); |
| 155 | |
| 156 | $fd = fopen($target, 'a'); |
| 157 | $gzfd = gzopen($file, 'rb'); |
| 158 | |
| 159 | $read = $write = 0; |
| 160 | if(isset($info->fdpos) && $info->fdpos) { |
| 161 | $write = $info->fdpos; |
| 162 | fseek($fd, $info->fdpos); |
| 163 | } |
| 164 | |
| 165 | if(isset($info->fdgzpos) && $info->fdgzpos) { |
| 166 | $read = $info->fdgzpos; |
| 167 | gzseek($gzfd, $info->fdgzpos); |
| 168 | } |
| 169 | |
| 170 | while(!feof($gzfd)) { |
| 171 | $write += fwrite($fd, gzread($gzfd, $chunkSize)); |
| 172 | $read += $chunkSize; |
| 173 | |
| 174 | self::_putInfo($info_file, [ |
| 175 | 'fdpos' => $write, |
| 176 | 'fdgzpos' => $read, |
| 177 | ]); |
| 178 | |
| 179 | if($callback) $callback( |
| 180 | 'Gzip', |
| 181 | 'Decompressing', |
| 182 | (int) (DirIteratorFile::safe_filesize($file) * 3), // estimating X3 compression ratio, just for percentage calc |
| 183 | $read) |
| 184 | ; |
| 185 | } |
| 186 | |
| 187 | if(feof($gzfd)) { |
| 188 | @unlink($file); |
| 189 | @unlink($info_file); |
| 190 | } |
| 191 | |
| 192 | fclose($fd); |
| 193 | gzclose($gzfd); |
| 194 | } |
| 195 | } |