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Extractor.php
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Extractor.php
255 lines
| 1 | <?php |
| 2 | |
| 3 | namespace JetBackup\SGB; |
| 4 | |
| 5 | use JetBackup\Exception\SGBExtractorException; |
| 6 | use JetBackup\JetBackup; |
| 7 | use JetBackup\Log\LogController; |
| 8 | |
| 9 | if (!defined( '__JETBACKUP__')) die('Direct access is not allowed'); |
| 10 | |
| 11 | class Extractor { |
| 12 | |
| 13 | private $_fd; |
| 14 | private $_target; |
| 15 | private $_info_file; |
| 16 | private LogController $_logController; |
| 17 | |
| 18 | /** |
| 19 | * @param string $file |
| 20 | * @param string $target |
| 21 | * |
| 22 | * @throws SGBExtractorException |
| 23 | */ |
| 24 | public function __construct(string $file, string $target) { |
| 25 | if(!($this->_fd = fopen($file, "rb"))) |
| 26 | throw new SGBExtractorException("Failed opening file"); |
| 27 | |
| 28 | // Move FD pointer to place |
| 29 | $this->_seek(-4, SEEK_END); |
| 30 | $footer_offset = $this->_readHex(4); |
| 31 | $this->_seek(-$footer_offset, SEEK_END); |
| 32 | |
| 33 | $this->_info_file = $file . '.info'; |
| 34 | $this->_target = $target; |
| 35 | $this->_logController = new LogController(); |
| 36 | |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * @param LogController $logController |
| 41 | * |
| 42 | * @return void |
| 43 | */ |
| 44 | public function setLogController(LogController $logController) { $this->_logController = $logController; } |
| 45 | |
| 46 | /** |
| 47 | * @return LogController |
| 48 | */ |
| 49 | public function getLogController():LogController { return $this->_logController; } |
| 50 | |
| 51 | /** |
| 52 | * @param int $length |
| 53 | * |
| 54 | * @return string|null |
| 55 | */ |
| 56 | private function _read(int $length):?string { |
| 57 | $read = fread($this->_fd, $length); |
| 58 | return $read === false ? null : $read; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * @param int $position |
| 63 | * @param int $whence |
| 64 | * |
| 65 | * @return int |
| 66 | */ |
| 67 | private function _seek(int $position, int $whence=SEEK_SET):int { |
| 68 | return fseek($this->_fd, $position, $whence); |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * @param int $length |
| 73 | * |
| 74 | * @return float|int |
| 75 | */ |
| 76 | private function _readHex(int $length) { |
| 77 | return hexdec(self::_unpackLittleEndian($this->_read($length), $length) ); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * @return array |
| 82 | */ |
| 83 | private function _getExtra():array { |
| 84 | $version = $this->_readHex(1); |
| 85 | $extra_size = $this->_readHex(4); |
| 86 | $extra = $extra_size > 0 ? $this->_read($extra_size) : []; |
| 87 | |
| 88 | if(is_string($extra)) { |
| 89 | $extra = json_decode($extra, true); |
| 90 | if(is_string($extra['tables'])) $extra['tables'] = json_decode($extra['tables'], true); |
| 91 | } |
| 92 | |
| 93 | if(is_array($extra)) $extra['versions'] = $version; |
| 94 | |
| 95 | return $extra; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * @return array |
| 100 | */ |
| 101 | private function _fetchFilesList():array { |
| 102 | |
| 103 | $total_files = $this->_readHex(4); |
| 104 | |
| 105 | $files = []; |
| 106 | |
| 107 | for($i = 0; $i < $total_files; $i++) { |
| 108 | |
| 109 | // we don't need the crc, just move the pointer 4 bytes |
| 110 | $this->_seek(4, SEEK_CUR); |
| 111 | // |
| 112 | |
| 113 | if (($filenameLen = $this->_readHex(2)) <= 0) continue; |
| 114 | |
| 115 | $file = []; |
| 116 | $file['filename'] = $this->_read($filenameLen); |
| 117 | $file['offset'] = $this->_readHex(8); |
| 118 | $file['chunks'] = []; |
| 119 | // We don't need the compressed/uncompressed length, just move the pointer 16 bytes (8 bytes for each one) |
| 120 | $this->_seek(16, SEEK_CUR); |
| 121 | // |
| 122 | $total_chunks = $this->_readHex(4); |
| 123 | |
| 124 | for($j = 0; $j < $total_chunks; $j++) { |
| 125 | $file['chunks'][] = [ |
| 126 | 'start' => $this->_readHex(8), |
| 127 | 'size' => $this->_readHex(8), |
| 128 | ]; |
| 129 | } |
| 130 | |
| 131 | $files[] = $file; |
| 132 | } |
| 133 | |
| 134 | return $files; |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * @param array $file |
| 139 | * |
| 140 | * @return void |
| 141 | * @throws SGBExtractorException |
| 142 | */ |
| 143 | private function _extractFile(array $file):void { |
| 144 | |
| 145 | $target = $this->_target . JetBackup::SEP . $file['filename']; |
| 146 | |
| 147 | if(!is_dir(dirname($target))) mkdir(dirname($target), 0755, true); |
| 148 | |
| 149 | $target_temp = $target . '.sgbpTemFile'; |
| 150 | |
| 151 | $chunks = $file['chunks']; |
| 152 | |
| 153 | $info = $this->_getInfo(); |
| 154 | |
| 155 | if($info->chunk <= 0 && file_exists($target_temp)) unlink($target_temp); |
| 156 | $fd = fopen($target_temp, "ab"); |
| 157 | |
| 158 | if($info->chunk > 0) $chunks = array_splice($chunks, $info->chunk); |
| 159 | |
| 160 | foreach($chunks as $chunk) { |
| 161 | fseek($fd, $chunk['start']); |
| 162 | |
| 163 | $this->_seek($file['offset'] + 4 + $chunk['start']); |
| 164 | $chunk_data = $this->_read($chunk['size']); |
| 165 | |
| 166 | if ( |
| 167 | !($file_data = gzinflate($chunk_data)) || |
| 168 | fwrite($fd, $file_data) == false |
| 169 | ) { |
| 170 | fclose($fd); |
| 171 | unlink($target_temp); |
| 172 | throw new SGBExtractorException("Failed to extracting file $target"); |
| 173 | } |
| 174 | |
| 175 | $info->chunk++; |
| 176 | $this->_updateInfo($info); |
| 177 | } |
| 178 | |
| 179 | fflush($fd); |
| 180 | fclose($fd); |
| 181 | |
| 182 | if(!@rename($target_temp, $target)) { |
| 183 | unlink($target_temp); |
| 184 | throw new SGBExtractorException("Error when trying to move $target_temp to $target"); |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * @return void |
| 190 | */ |
| 191 | public function extract(?callable $callback=null):void { |
| 192 | |
| 193 | // read the extra data just to move the FD pointer to place, we don't really need this data |
| 194 | $this->_getExtra(); |
| 195 | |
| 196 | $files = $this->_fetchFilesList(); |
| 197 | |
| 198 | $info = $this->_getInfo(); |
| 199 | |
| 200 | if($info->file > 0) $files = array_splice($files, $info->file); |
| 201 | |
| 202 | foreach($files as $file) { |
| 203 | try { |
| 204 | $this->_extractFile($file); |
| 205 | } catch(SGBExtractorException $e) { |
| 206 | $this->getLogController()->logError("Failed extracting file '{$file['filename']}', skipping to next file. Error: " . $e->getMessage()); |
| 207 | } |
| 208 | |
| 209 | $info->file++; |
| 210 | $info->chunk = 0; |
| 211 | $this->_updateInfo($info); |
| 212 | |
| 213 | if($callback) $callback(); |
| 214 | } |
| 215 | |
| 216 | @unlink($this->_info_file); |
| 217 | @unlink($this->_info_file . '.tmp'); |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * @param string $data |
| 222 | * @param int $size |
| 223 | * |
| 224 | * @return string |
| 225 | */ |
| 226 | private static function _unpackLittleEndian(string $data, int $size):string { |
| 227 | return unpack('H' . ($size * 2), strrev($data))[1]; |
| 228 | } |
| 229 | |
| 230 | private function _getInfo() { |
| 231 | |
| 232 | if(file_exists($this->_info_file)) { |
| 233 | $data = file_get_contents($this->_info_file); |
| 234 | if($data && ($output = json_decode($data))) return $output; |
| 235 | } |
| 236 | |
| 237 | $output = new \stdClass(); |
| 238 | $output->file = 0; |
| 239 | $output->chunk = 0; |
| 240 | return $output; |
| 241 | } |
| 242 | |
| 243 | private function _updateInfo($data) { |
| 244 | $tempFile = $this->_info_file . '.tmp'; |
| 245 | $jsonData = json_encode($data); |
| 246 | if ($jsonData === false) |
| 247 | throw new SGBExtractorException("Failed to encode compress information"); |
| 248 | |
| 249 | if (file_put_contents($tempFile, $jsonData) === false) |
| 250 | throw new SGBExtractorException("Failed to write compress information to temporary file"); |
| 251 | |
| 252 | if (!rename($tempFile, $this->_info_file)) |
| 253 | throw new SGBExtractorException("Failed to atomically write compress information"); |
| 254 | } |
| 255 | } |