ज़िप आर्काइव कैसा दिखता है और हम इसके साथ क्या कर सकते हैं। भाग 2 - डेटा डिस्क्रिप्टर और संपीड़न

<?php //        (1.txt  2.txt)   : $entries = [ '1.txt' => 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc id ante ultrices, fermentum nibh eleifend, ullamcorper nunc. Sed dignissim ut odio et imperdiet. Nunc id felis et ligula viverra blandit a sit amet magna. Vestibulum facilisis venenatis enim sed bibendum. Duis maximus felis in suscipit bibendum. Mauris suscipit turpis eleifend nibh commodo imperdiet. Donec tincidunt porta interdum. Aenean interdum condimentum ligula, vitae ornare lorem auctor in. Suspendisse metus ipsum, porttitor et sapien id, fringilla aliquam nibh. Curabitur sem lacus, ultrices quis felis sed, blandit commodo metus. Duis tincidunt vel mauris at accumsan. Integer et ipsum fermentum leo viverra blandit.', '2.txt' => 'Mauris in purus sit amet ante tempor finibus nec sed justo. Integer ac nibh tempus, mollis sem vel, consequat diam. Pellentesque ut condimentum ex. Praesent finibus volutpat gravida. Vivamus eleifend neque sit amet diam scelerisque lacinia. Nunc imperdiet augue in suscipit lacinia. Curabitur orci diam, iaculis non ligula vitae, porta pellentesque est. Duis dolor erat, placerat a lacus eu, scelerisque egestas massa. Aliquam molestie pulvinar faucibus. Quisque consequat, dolor mattis lacinia pretium, eros eros tempor neque, volutpat consectetur elit elit non diam. In faucibus nulla justo, non dignissim erat maximus consectetur. Sed porttitor turpis nisl, elementum aliquam dui tincidunt nec. Nunc eu enim at nibh molestie porta ut ac erat. Sed tortor sem, mollis eget sodales vel, faucibus in dolor.', ]; //      Lorem.zip,      cwd (      ) $destination = 'Lorem.zip'; $handle = fopen($destination, 'w'); //      ,    ,     ,   "" Central Directory File Header $written = 0; $dictionary = []; foreach ($entries as $filename => $content) { //         Local File Header,     //        ,      . $fileInfo = [ //     'versionToExtract' => 10, //   0,        - 'generalPurposeBitFlag' => 0, //      ,    0 'compressionMethod' => 0, // -    mtime ,    ,      ? 'modificationTime' => 28021, //   , ? 'modificationDate' => 20072, //      .     ,       ,   ? 'crc32' => hexdec(hash('crc32b', $content)), //     .        . //       :) 'compressedSize' => $size = strlen($content), 'uncompressedSize' => $size, //    'filenameLength' => strlen($filename), //  .    ,   0. 'extraFieldLength' => 0, ]; //      . $LFH = pack('LSSSSSLLLSSa*', ...array_values([ 'signature' => 0x04034b50, //  Local File Header ] + $fileInfo + ['filename' => $filename])); //       ,       Central Directory File Header $dictionary[$filename] = [ 'signature' => 0x02014b50, //  Central Directory File Header 'versionMadeBy' => 798, //  .    ,  -  . ] + $fileInfo + [ 'fileCommentLength' => 0, //    . No comments 'diskNumber' => 0, //     0,        'internalFileAttributes' => 0, //    'externalFileAttributes' => 2176057344, //    'localFileHeaderOffset' => $written, //      Local File Header 'filename' => $filename, //  . ]; //      $written += fwrite($handle, $LFH); //    $written += fwrite($handle, $content); } // ,     ,    . //          End of central directory record (EOCD) $EOCD = [ //  EOCD 'signature' => 0x06054b50, //  .    ,   0 'diskNumber' => 0, //      -  0 'startDiskNumber' => 0, //       . 'numberCentralDirectoryRecord' => $records = count($dictionary), //    .    ,     'totalCentralDirectoryRecord' => $records, //   Central Directory Record. //      ,      'sizeOfCentralDirectory' => 0, // ,    Central Directory Records 'centralDirectoryOffset' => $written, //     'commentLength' => 0 ]; //     !   foreach ($dictionary as $entryInfo) { $CDFH = pack('LSSSSSSLLLSSSSSLLa*', ...array_values($entryInfo)); $written += fwrite($handle, $CDFH); } // ,   .  ,    $EOCD['sizeOfCentralDirectory'] = $written - $EOCD['centralDirectoryOffset']; //     End of central directory record $EOCD = pack('LSSSSLLS', ...array_values($EOCD)); $written += fwrite($handle, $EOCD); //  . fclose($handle); echo '  : ' . $written . ' ' . PHP_EOL; echo '     `unzip -tq ' . $destination . '`' . PHP_EOL; echo PHP_EOL; 

 <?php function read(string $path): \Generator { $length = 0; $handle = fopen($path, 'r'); $hashCtx = hash_init('crc32b'); while (!feof($handle)) { $chunk = fread($handle, 8 * 1024); $length += strlen($chunk); hash_update($hashCtx, $chunk); yield $chunk; $chunk = null; } fclose($handle); return ['length' => $length, 'crc32' => hexdec(hash_final($hashCtx))]; } $entries = ['https://speed.hetzner.de/100MB.bin', __FILE__]; $destination = 'test.zip'; $handle = fopen($destination, 'w'); $written = 0; $dictionary = []; foreach ($entries as $entry) { $filename = basename($entry); $fileInfo = [ 'versionToExtract' => 10, //       Data Descriptor,     00008, //   00000    . 'generalPurposeBitFlag' => 0x0008, 'compressionMethod' => 0, 'modificationTime' => 28021, 'modificationDate' => 20072, 'crc32' => 0, 'compressedSize' => 0, 'uncompressedSize' => 0, 'filenameLength' => strlen($filename), 'extraFieldLength' => 0, ]; $LFH = pack('LSSSSSLLLSSa*', ...array_values([ 'signature' => 0x04034b50, ] + $fileInfo + ['filename' => $filename])); $fileOffset = $written; $written += fwrite($handle, $LFH); //     $reader = read($entry); foreach ($reader as $chunk) { //      $written += fwrite($handle, $chunk); $chunk = null; } //       ['length' => $length, 'crc32' => $crc32] = $reader->getReturn(); //    fileInfo,     CDFH $fileInfo['crc32'] = $crc32; $fileInfo['compressedSize'] = $length; $fileInfo['uncompressedSize'] = $length; //  Data Descriptor $DD = pack('LLLL', ...array_values([ 'signature' => 0x08074b50, 'crc32' => $fileInfo['crc32'], 'compressedSize' => $fileInfo['compressedSize'], 'uncompressedSize' => $fileInfo['uncompressedSize'], ])); $written += fwrite($handle, $DD); $dictionary[$filename] = [ 'signature' => 0x02014b50, 'versionMadeBy' => 798, ] + $fileInfo + [ 'fileCommentLength' => 0, 'diskNumber' => 0, 'internalFileAttributes' => 0, 'externalFileAttributes' => 2176057344, 'localFileHeaderOffset' => $fileOffset, 'filename' => $filename, ]; } $EOCD = [ 'signature' => 0x06054b50, 'diskNumber' => 0, 'startDiskNumber' => 0, 'numberCentralDirectoryRecord' => $records = count($dictionary), 'totalCentralDirectoryRecord' => $records, 'sizeOfCentralDirectory' => 0, 'centralDirectoryOffset' => $written, 'commentLength' => 0 ]; foreach ($dictionary as $entryInfo) { $CDFH = pack('LSSSSSSLLLSSSSSLLa*', ...array_values($entryInfo)); $written += fwrite($handle, $CDFH); } $EOCD['sizeOfCentralDirectory'] = $written - $EOCD['centralDirectoryOffset']; $EOCD = pack('LSSSSLLS', ...array_values($EOCD)); $written += fwrite($handle, $EOCD); fclose($handle); echo '  : ' . memory_get_peak_usage(true) . ' ' . PHP_EOL; echo '  : ' . $written . ' ' . PHP_EOL; echo '   `unzip -tq ' . $destination . '`: ' . PHP_EOL; echo '> ' . exec('unzip -tq ' . $destination) . PHP_EOL; echo PHP_EOL; 

 while (!feof($handle)) { yield deflate_add($deflateCtx, $chunk, ZLIB_SYNC_FLUSH); } yield deflate_add($deflateCtx, '', ZLIB_FINISH); 

 <?php function read(string $path): \Generator { $uncompressedSize = 0; $compressedSize = 0; $hashCtx = hash_init('crc32b'); $deflateCtx = deflate_init(ZLIB_ENCODING_RAW, ['level' => 6]); $handle = fopen($path, 'r'); while (!feof($handle)) { $chunk = fread($handle, 8 * 1024); hash_update($hashCtx, $chunk); $compressedChunk = deflate_add($deflateCtx, $chunk, feof($handle) ? ZLIB_FINISH : ZLIB_SYNC_FLUSH); $uncompressedSize += strlen($chunk); $compressedSize += strlen($compressedChunk); yield $compressedChunk; $chunk = null; $compressedChunk = null; } fclose($handle); return [ 'uncompressedSize' => $uncompressedSize, 'compressedSize' => $compressedSize, 'crc32' => hexdec(hash_final($hashCtx)) ]; } $entries = ['https://speed.hetzner.de/100MB.bin', __FILE__]; $destination = 'test.zip'; $handle = fopen($destination, 'w'); $written = 0; $dictionary = []; foreach ($entries as $entry) { $filename = basename($entry); $fileInfo = [ 'versionToExtract' => 10, //   ,        0x0018  0x0008 'generalPurposeBitFlag' => 0x0018, 'compressionMethod' => 8, //      : 8 - Deflate 'modificationTime' => 28021, 'modificationDate' => 20072, 'crc32' => 0, 'compressedSize' => 0, 'uncompressedSize' => 0, 'filenameLength' => strlen($filename), 'extraFieldLength' => 0, ]; $LFH = pack('LSSSSSLLLSSa*', ...array_values([ 'signature' => 0x04034b50, ] + $fileInfo + ['filename' => $filename])); $fileOffset = $written; $written += fwrite($handle, $LFH); $reader = read($entry); foreach ($reader as $chunk) { $written += fwrite($handle, $chunk); $chunk = null; } [ 'uncompressedSize' => $uncompressedSize, 'compressedSize' => $compressedSize, 'crc32' => $crc32 ] = $reader->getReturn(); $fileInfo['crc32'] = $crc32; $fileInfo['compressedSize'] = $compressedSize; $fileInfo['uncompressedSize'] = $uncompressedSize; $DD = pack('LLLL', ...array_values([ 'signature' => 0x08074b50, 'crc32' => $fileInfo['crc32'], 'compressedSize' => $fileInfo['compressedSize'], 'uncompressedSize' => $fileInfo['uncompressedSize'], ])); $written += fwrite($handle, $DD); $dictionary[$filename] = [ 'signature' => 0x02014b50, 'versionMadeBy' => 798, ] + $fileInfo + [ 'fileCommentLength' => 0, 'diskNumber' => 0, 'internalFileAttributes' => 0, 'externalFileAttributes' => 2176057344, 'localFileHeaderOffset' => $fileOffset, 'filename' => $filename, ]; } $EOCD = [ 'signature' => 0x06054b50, 'diskNumber' => 0, 'startDiskNumber' => 0, 'numberCentralDirectoryRecord' => $records = count($dictionary), 'totalCentralDirectoryRecord' => $records, 'sizeOfCentralDirectory' => 0, 'centralDirectoryOffset' => $written, 'commentLength' => 0 ]; foreach ($dictionary as $entryInfo) { $CDFH = pack('LSSSSSSLLLSSSSSLLa*', ...array_values($entryInfo)); $written += fwrite($handle, $CDFH); } $EOCD['sizeOfCentralDirectory'] = $written - $EOCD['centralDirectoryOffset']; $EOCD = pack('LSSSSLLS', ...array_values($EOCD)); $written += fwrite($handle, $EOCD); fclose($handle); echo '  : ' . memory_get_peak_usage(true) . ' ' . PHP_EOL; echo '  : ' . $written . ' ' . PHP_EOL; echo '   `unzip -tq ' . $destination . '`: ' . PHP_EOL; echo '> ' . exec('unzip -tq ' . $destination) . PHP_EOL; echo PHP_EOL;