<?php

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[1] Fix | Delete

namespace Nextend\Framework\Misc\Zip\Reader;

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use Nextend\Framework\Misc\Zip\ReaderInterface;

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use Nextend\Framework\Notification\Notification;

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class Custom implements ReaderInterface {

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private $fileHandle;

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private $file;

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public function read($path) {

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$this->file = $path;

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return $this->extract();

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}

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private function extract() {

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$extractedData = array();

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if (!is_readable(dirname($this->file))) {

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Notification::error(sprintf(n2_('%s is not readable'), dirname($this->file)));

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return false;

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}

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if (!$this->file || !is_file($this->file)) return false;

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$filesize = sprintf('%u', filesize($this->file));

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$this->fileHandle = fopen($this->file, 'rb');

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$EofCentralDirData = $this->_findEOFCentralDirectoryRecord($filesize);

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if (!is_array($EofCentralDirData)) return false;

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$centralDirectoryHeaderOffset = $EofCentralDirData['centraldiroffset'];

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for ($i = 0; $i < $EofCentralDirData['totalentries']; $i++) {

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rewind($this->fileHandle);

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fseek($this->fileHandle, $centralDirectoryHeaderOffset);

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$centralDirectoryData = $this->_readCentralDirectoryData();

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$centralDirectoryHeaderOffset += 46 + $centralDirectoryData['filenamelength'] + $centralDirectoryData['extrafieldlength'] + $centralDirectoryData['commentlength'];

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if (!is_array($centralDirectoryData) || substr($centralDirectoryData['filename'], -1) == '/') continue;

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$data = $this->_readLocalFileHeaderAndData($centralDirectoryData);

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if (!$data) continue;

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$dir = dirname($centralDirectoryData['filename']);

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$fileName = basename($centralDirectoryData['filename']);

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if ($dir != '.' && $dir != '') {

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if (!isset($extractedData[$dir])) {

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$extractedData[$dir] = array();

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}

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$extractedData[$dir][$fileName] = $data;

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} else {

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$extractedData[$fileName] = $data;

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}

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}

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fclose($this->fileHandle);

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return $extractedData;

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}

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private function _findEOFCentralDirectoryRecord($filesize) {

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fseek($this->fileHandle, $filesize - 22);

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$EofCentralDirSignature = unpack('Vsignature', fread($this->fileHandle, 4));

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if ($EofCentralDirSignature['signature'] != 0x06054b50) {

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$maxLength = 65535 + 22;

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$maxLength > $filesize && $maxLength = $filesize;

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fseek($this->fileHandle, $filesize - $maxLength);

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$searchPos = ftell($this->fileHandle);

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while ($searchPos < $filesize) {

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fseek($this->fileHandle, $searchPos);

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$sigData = unpack('Vsignature', fread($this->fileHandle, 4));

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if ($sigData['signature'] == 0x06054b50) {

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break;

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}

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$searchPos++;

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}

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}

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$EofCentralDirData = unpack('vdisknum/vdiskstart/vcentraldirnum/vtotalentries/Vcentraldirsize/Vcentraldiroffset/vcommentlength', fread($this->fileHandle, 18));

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return $EofCentralDirData;

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}

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private function _readCentralDirectoryData() {

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$centralDirectorySignature = unpack('Vsignature', fread($this->fileHandle, 4));

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if ($centralDirectorySignature['signature'] != 0x02014b50) return false;

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$centralDirectoryData = fread($this->fileHandle, 42);

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$centralDirectoryData = unpack('vmadeversion/vextractversion/vflag/vcompressmethod/vmodtime/vmoddate/Vcrc/Vcompressedsize/Vuncompressedsize/vfilenamelength/vextrafieldlength/vcommentlength/vdiskstart/vinternal/Vexternal/Vlocalheaderoffset', $centralDirectoryData);

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$centralDirectoryData['filenamelength'] && $centralDirectoryData['filename'] = fread($this->fileHandle, $centralDirectoryData['filenamelength']);

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return $centralDirectoryData;

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}

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private function _readLocalFileHeaderAndData($centralDirectoryData) {

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fseek($this->fileHandle, $centralDirectoryData['localheaderoffset']);

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$localFileHeaderSignature = unpack('Vsignature', fread($this->fileHandle, 4));

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if ($localFileHeaderSignature['signature'] != 0x04034b50) return false;

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$localFileHeaderData = fread($this->fileHandle, 26);

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$localFileHeaderData = unpack('vextractversion/vflag/vcompressmethod/vmodtime/vmoddate/Vcrc/Vcompressedsize/Vuncompressedsize/vfilenamelength/vextrafieldlength', $localFileHeaderData);

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$localFileHeaderData['filenamelength'] && $localFileHeaderData['filename'] = fread($this->fileHandle, $localFileHeaderData['filenamelength']);

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if (!$this->_checkLocalFileHeaderAndCentralDir($localFileHeaderData, $centralDirectoryData)) return false;

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if ($localFileHeaderData['flag'] & 1) return false;

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$compressedData = fread($this->fileHandle, $localFileHeaderData['compressedsize']);

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$data = $this->_unCompressData($compressedData, $localFileHeaderData['compressmethod']);

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if (crc32($data) != $localFileHeaderData['crc'] || strlen($data) != $localFileHeaderData['uncompressedsize']) return false;

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return $data;

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}

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private function _unCompressData($data, $compressMethod) {

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if (!$compressMethod) return $data;

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switch ($compressMethod) {

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case 8 :

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$data = gzinflate($data);

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break;

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default :

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return false;

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break;

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}

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return $data;

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}

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private function _checkLocalFileHeaderAndCentralDir($localFileHeaderData, $centralDirectoryData) {

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return true;

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}

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}

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