Contao\ZipReader::readCentralDirectory PHP Метод

    protected function readCentralDirectory()
    {
        $strMbCharset = null;
        // Set the mbstring encoding to ASCII (see #5842)
        if (ini_get('mbstring.func_overload') > 0) {
            $strMbCharset = mb_internal_encoding();
            if (mb_internal_encoding('ASCII') === false) {
                $strMbCharset = null;
            }
        }
        $intOffset = 0;
        $pos = 0;
        $intInterval = min(filesize(TL_ROOT . '/' . $this->strFile), 1024);
        $strBuffer = '';
        // Read to delimiter
        do {
            $intOffset -= $intInterval;
            $fseek = @fseek($this->resFile, $intOffset, SEEK_END);
            $strBuffer = @fread($this->resFile, abs($intOffset)) . $strBuffer;
        } while ($fseek != -1 && ($pos = strpos($strBuffer, self::CENTRAL_DIR_END)) === false);
        // Reposition pointer
        fseek($this->resFile, $intOffset + $pos, SEEK_END);
        $strSignature = @fread($this->resFile, 4);
        // Read archive header
        if ($strSignature != self::CENTRAL_DIR_END) {
            throw new \Exception('Error reading central directory');
        }
        $arrHeader = array();
        $arrHeader['number_of_this_disk'] = unpack('v', @fread($this->resFile, 2));
        $arrHeader['number_of_disk_with_cd'] = unpack('v', @fread($this->resFile, 2));
        $arrHeader['total_cd_entries_disk'] = unpack('v', @fread($this->resFile, 2));
        $arrHeader['total_cd_entries'] = unpack('v', @fread($this->resFile, 2));
        $arrHeader['size_of_cd'] = unpack('V', @fread($this->resFile, 4));
        $arrHeader['offset_start_cd'] = unpack('V', @fread($this->resFile, 4));
        $arrHeader['zipfile_comment_length'] = unpack('v', @fread($this->resFile, 2));
        $arrHeader['zipfile_comment'] = $arrHeader['zipfile_comment_length'][1] ? @fread($this->resFile, $arrHeader['zipfile_comment_length'][1]) : '';
        // Eliminate nested arrays
        foreach ($arrHeader as $k => $v) {
            $arrHeader[$k] = is_array($v) ? $v[1] : $v;
        }
        $this->arrHeader = $arrHeader;
        // Reposition pointer to begin of the central directory
        fseek($this->resFile, $this->arrHeader['offset_start_cd'], SEEK_SET);
        $strSignature = @fread($this->resFile, 4);
        // Build file list
        while ($strSignature == self::CENTRAL_DIR_START) {
            $arrFile = array();
            $arrFile['version_made_by'] = unpack('v', @fread($this->resFile, 2));
            $arrFile['version_needed_to_extract'] = unpack('v', @fread($this->resFile, 2));
            $arrFile['general_purpose_bit_flag'] = unpack('v', @fread($this->resFile, 2));
            $arrFile['compression_method'] = unpack('v', @fread($this->resFile, 2));
            $arrFile['last_mod_file_time'] = unpack('v', @fread($this->resFile, 2));
            $arrFile['last_mod_file_date'] = unpack('v', @fread($this->resFile, 2));
            $arrFile['crc-32'] = unpack('V', @fread($this->resFile, 4));
            $arrFile['compressed_size'] = unpack('V', @fread($this->resFile, 4));
            $arrFile['uncompressed_size'] = unpack('V', @fread($this->resFile, 4));
            $arrFile['file_name_length'] = unpack('v', @fread($this->resFile, 2));
            $arrFile['extra_field_length'] = unpack('v', @fread($this->resFile, 2));
            $arrFile['file_comment_length'] = unpack('v', @fread($this->resFile, 2));
            $arrFile['disk_number_start'] = unpack('v', @fread($this->resFile, 2));
            $arrFile['internal_file_attributes'] = unpack('v', @fread($this->resFile, 2));
            $arrFile['external_file_attributes'] = unpack('V', @fread($this->resFile, 4));
            $arrFile['offset_of_local_header'] = unpack('V', @fread($this->resFile, 4));
            $arrFile['file_name'] = @fread($this->resFile, $arrFile['file_name_length'][1]);
            $arrFile['extra_field'] = $arrFile['extra_field_length'][1] ? @fread($this->resFile, $arrFile['extra_field_length'][1]) : '';
            $arrFile['file_comment'] = $arrFile['file_comment_length'][1] ? @fread($this->resFile, $arrFile['file_comment_length'][1]) : '';
            // Skip directories
            if (substr($arrFile['file_name'], -1) == '/') {
                $strSignature = @fread($this->resFile, 4);
                continue;
            }
            // Eliminate nested arrays
            foreach ($arrFile as $k => $v) {
                $arrFile[$k] = is_array($v) ? $v[1] : $v;
            }
            // Split file path
            $arrFile['file_basename'] = basename($arrFile['file_name']);
            $arrFile['file_dirname'] = ($path = dirname($arrFile['file_name'])) != '.' ? $path : '';
            // Add UNIX time
            $arrFile['last_mod_file_unix'] = $this->decToUnix((int) $arrFile['last_mod_file_time'], (int) $arrFile['last_mod_file_date']);
            // Read next signature
            $strSignature = @fread($this->resFile, 4);
            $this->arrFiles[] = $arrFile;
        }
        $this->intLast = count($this->arrFiles) - 1;
        // Restore the mbstring encoding (see #5842)
        $strMbCharset && mb_internal_encoding($strMbCharset);
    }