protected function extractThemeFiles($arrFiles, $arrDbFields)
	{
		foreach ($arrFiles as $strZipFile)
		{
			$xml = null;

			// Open the archive
			$objArchive = new ZipReader($strZipFile);

			// Extract all files
			while ($objArchive->next())
			{
				// Load the XML file
				if ($objArchive->file_name == 'theme.xml')
				{
					$xml = new \DOMDocument();
					$xml->preserveWhiteSpace = false;
					$xml->loadXML($objArchive->unzip());
					continue;
				}

				// Limit file operations to files and the templates directory
				if (strncmp($objArchive->file_name, 'files/', 6) !== 0 && strncmp($objArchive->file_name, 'tl_files/', 9) !== 0 && strncmp($objArchive->file_name, 'templates/', 10) !== 0)
				{
					Message::addError(sprintf($GLOBALS['TL_LANG']['ERR']['invalidFile'], $objArchive->file_name));
					continue;
				}

				// Extract the files
				try
				{
					File::putContent($this->customizeUploadPath($objArchive->file_name), $objArchive->unzip());
				}
				catch (\Exception $e)
				{
					Message::addError($e->getMessage());
				}
			}

			// Continue if there is no XML file
			if (!$xml instanceof \DOMDocument)
			{
				Message::addError(sprintf($GLOBALS['TL_LANG']['tl_theme']['missing_xml'], basename($strZipFile)));
				continue;
			}

			$arrMapper = array();
			$tables = $xml->getElementsByTagName('table');
			$arrNewFolders = array();

			// Extract the folder names from the XML file
			for ($i=0; $i<$tables->length; $i++)
			{
				if ($tables->item($i)->getAttribute('name') == 'tl_theme')
				{
					$fields = $tables->item($i)->childNodes->item(0)->childNodes;

					for ($k=0; $k<$fields->length; $k++)
					{
						if ($fields->item($k)->getAttribute('name') == 'folders')
						{
							$arrNewFolders = StringUtil::deserialize($fields->item($k)->nodeValue);
							break;
						}
					}

					break;
				}
			}

			// Sync the new folder(s)
			if (!empty($arrNewFolders) && \is_array($arrNewFolders))
			{
				foreach ($arrNewFolders as $strFolder)
				{
					$strCustomized = $this->customizeUploadPath($strFolder);

					if (Dbafs::shouldBeSynchronized($strCustomized))
					{
						Dbafs::addResource($strCustomized);
					}
				}
			}

			// Lock the tables
			$arrLocks = array
			(
				'tl_files'           => 'WRITE',
				'tl_theme'           => 'WRITE',
				'tl_style_sheet'     => 'WRITE',
				'tl_style'           => 'WRITE',
				'tl_module'          => 'WRITE',
				'tl_layout'          => 'WRITE',
				'tl_image_size'      => 'WRITE',
				'tl_image_size_item' => 'WRITE'
			);

			// Load the DCAs of the locked tables (see #7345)
			foreach (array_keys($arrLocks) as $table)
			{
				$this->loadDataContainer($table);
			}

			$this->Database->lockTables($arrLocks);

			// Get the current auto_increment values
			$tl_files = $this->Database->getNextId('tl_files');
			$tl_theme = $this->Database->getNextId('tl_theme');
			$tl_style_sheet = $this->Database->getNextId('tl_style_sheet');
			$tl_style = $this->Database->getNextId('tl_style');
			$tl_module = $this->Database->getNextId('tl_module');
			$tl_layout = $this->Database->getNextId('tl_layout');
			$tl_image_size = $this->Database->getNextId('tl_image_size');
			$tl_image_size_item = $this->Database->getNextId('tl_image_size_item');

			// Build the mapper data (see #8326)
			for ($i=0; $i<$tables->length; $i++)
			{
				$rows = $tables->item($i)->childNodes;
				$table = $tables->item($i)->getAttribute('name');

				// Skip invalid tables
				if (!\array_key_exists($table, $arrLocks))
				{
					continue;
				}

				// Loop through the rows
				for ($j=0; $j<$rows->length; $j++)
				{
					$fields = $rows->item($j)->childNodes;

					// Loop through the fields
					for ($k=0; $k<$fields->length; $k++)
					{
						// Increment the ID
						if ($fields->item($k)->getAttribute('name') == 'id')
						{
							$arrMapper[$table][$fields->item($k)->nodeValue] = ${$table}++;
							break;
						}
					}
				}
			}

			// Loop through the tables
			for ($i=0; $i<$tables->length; $i++)
			{
				$rows = $tables->item($i)->childNodes;
				$table = $tables->item($i)->getAttribute('name');

				// Skip invalid tables
				if (!\array_key_exists($table, $arrLocks))
				{
					continue;
				}

				// Get the order fields
				$objDcaExtractor = DcaExtractor::getInstance($table);
				$arrOrder = $objDcaExtractor->getOrderFields();

				// Loop through the rows
				for ($j=0; $j<$rows->length; $j++)
				{
					$set = array();
					$fields = $rows->item($j)->childNodes;

					// Loop through the fields
					for ($k=0; $k<$fields->length; $k++)
					{
						$value = $fields->item($k)->nodeValue;
						$name = $fields->item($k)->getAttribute('name');

						// Skip NULL values
						if ($value == 'NULL')
						{
							continue;
						}

						// Increment the ID
						elseif ($name == 'id')
						{
							$value = $arrMapper[$table][$value];
						}

						// Increment the parent IDs
						elseif ($name == 'pid')
						{
							if ($table == 'tl_style')
							{
								$value = $arrMapper['tl_style_sheet'][$value];
							}
							elseif ($table == 'tl_image_size_item')
							{
								$value = $arrMapper['tl_image_size'][$value];
							}
							else
							{
								$value = $arrMapper['tl_theme'][$value];
							}
						}

						// Handle fallback fields
						elseif ($name == 'fallback')
						{
							$value = '';
						}

						// Adjust the style sheet IDs of the page layout
						elseif ($table == 'tl_layout' && $name == 'stylesheet')
						{
							$stylesheets = StringUtil::deserialize($value);

							if (\is_array($stylesheets))
							{
								foreach (array_keys($stylesheets) as $key)
								{
									$stylesheets[$key] = $arrMapper['tl_style_sheet'][$stylesheets[$key]];
								}

								$value = serialize($stylesheets);
							}
						}

						// Adjust the module IDs of the page layout
						elseif ($table == 'tl_layout' && $name == 'modules')
						{
							$modules = StringUtil::deserialize($value);

							if (\is_array($modules))
							{
								foreach ($modules as $key=>$mod)
								{
									if ($mod['mod'] > 0)
									{
										$modules[$key]['mod'] = $arrMapper['tl_module'][$mod['mod']];
									}
								}

								$value = serialize($modules);
							}
						}

						// Adjust duplicate theme and style sheet names
						elseif (($table == 'tl_theme' || $table == 'tl_style_sheet') && $name == 'name')
						{
							$objCount = $this->Database->prepare("SELECT COUNT(*) AS count FROM ". $table ." WHERE name=?")
													   ->execute($value);

							if ($objCount->count > 0)
							{
								$value = preg_replace('/( |\-)[0-9]+$/', '', $value);
								$value .= (($table == 'tl_style_sheet') ? '-' : ' ') . ${$table};
							}
						}

						// Adjust the file paths in style sheets and tl_files
						elseif (($table == 'tl_style_sheet' || $table == 'tl_style' || ($table == 'tl_files' && $name == 'path')) && strpos($value, 'files') !== false)
						{
							$tmp = StringUtil::deserialize($value);

							if (\is_array($tmp))
							{
								foreach ($tmp as $kk=>$vv)
								{
									$tmp[$kk] = $this->customizeUploadPath($vv);
								}

								$value = serialize($tmp);
							}
							else
							{
								$value = $this->customizeUploadPath($value);
							}
						}

						// Replace the file paths in singleSRC fields with their tl_files ID
						elseif ($GLOBALS['TL_DCA'][$table]['fields'][$name]['inputType'] == 'fileTree' && !$GLOBALS['TL_DCA'][$table]['fields'][$name]['eval']['multiple'])
						{
							if (!$value)
							{
								$value = null; // Contao >= 3.2
							}
							else
							{
								// Do not use the FilesModel here – tables are locked!
								$objFile = $this->Database->prepare("SELECT uuid FROM tl_files WHERE path=?")
														  ->limit(1)
														  ->execute($this->customizeUploadPath($value));

								$value = $objFile->uuid;
							}
						}

						// Replace the file paths in multiSRC fields with their tl_files ID
						elseif ($GLOBALS['TL_DCA'][$table]['fields'][$name]['inputType'] == 'fileTree' || \in_array($name, $arrOrder))
						{
							$tmp = StringUtil::deserialize($value);

							if (\is_array($tmp))
							{
								foreach ($tmp as $kk=>$vv)
								{
									// Do not use the FilesModel here – tables are locked!
									$objFile = $this->Database->prepare("SELECT uuid FROM tl_files WHERE path=?")
															  ->limit(1)
															  ->execute($this->customizeUploadPath($vv));

									$tmp[$kk] = $objFile->uuid;
								}

								$value = serialize($tmp);
							}
						}

						// Adjust the imageSize widget data
						elseif ($GLOBALS['TL_DCA'][$table]['fields'][$name]['inputType'] == 'imageSize')
						{
							$imageSizes = StringUtil::deserialize($value, true);

							if (!empty($imageSizes))
							{
								if (is_numeric($imageSizes[2]))
								{
									$imageSizes[2] = $arrMapper['tl_image_size'][$imageSizes[2]];
								}
							}

							$value = serialize($imageSizes);
						}

						$set[$name] = $value;
					}

					// Skip fields that are not in the database (e.g. because of missing extensions)
					foreach ($set as $k=>$v)
					{
						if (!\in_array($k, $arrDbFields[$table]))
						{
							unset($set[$k]);
						}
					}

					// Create the templates folder even if it is empty (see #4793)
					if ($table == 'tl_theme' && isset($set['templates']) && strncmp($set['templates'], 'templates/', 10) === 0 && !is_dir($this->strRootDir . '/' . $set['templates']))
					{
						new Folder($set['templates']);
					}

					// Update tl_files (entries have been created by the Dbafs class)
					if ($table == 'tl_files')
					{
						$this->Database->prepare("UPDATE $table %s WHERE path=?")->set($set)->execute($set['path']);
					}
					else
					{
						$this->Database->prepare("INSERT INTO $table %s")->set($set)->execute();
					}
				}
			}

			// Unlock the tables
			$this->Database->unlockTables();

			// Update the style sheets
			$this->import(StyleSheets::class, 'StyleSheets');
			$this->StyleSheets->updateStyleSheets();

			// Notify the user
			Message::addConfirmation(sprintf($GLOBALS['TL_LANG']['tl_theme']['theme_imported'], basename($strZipFile)));

			// HOOK: add custom logic
			if (isset($GLOBALS['TL_HOOKS']['extractThemeFiles']) && \is_array($GLOBALS['TL_HOOKS']['extractThemeFiles']))
			{
				$intThemeId = empty($arrMapper['tl_theme']) ? null : reset($arrMapper['tl_theme']);

				foreach ($GLOBALS['TL_HOOKS']['extractThemeFiles'] as $callback)
				{
					System::importStatic($callback[0])->{$callback[1]}($xml, $objArchive, $intThemeId, $arrMapper);
				}
			}

			unset($tl_files, $tl_theme, $tl_style_sheet, $tl_style, $tl_module, $tl_layout, $tl_image_size, $tl_image_size_item);
		}

		System::setCookie('BE_PAGE_OFFSET', 0, 0);

		/** @var Session $objSession */
		$objSession = System::getContainer()->get('session');
		$objSession->remove('uploaded_themes');

		$this->import(Automator::class, 'Automator');
		$this->Automator->generateSymlinks();

		$this->redirect(str_replace('&key=importTheme', '', Environment::get('request')));
	}
protected function extractThemeFiles($arrFiles, $arrDbFields)
	{
		foreach ($arrFiles as $strZipFile)
		{
			$xml = null;

			// Open the archive
			$objArchive = new ZipReader($strZipFile);

			// Extract all files
			while ($objArchive->next())
			{
				// Load the XML file
				if ($objArchive->file_name == 'theme.xml')
				{
					$xml = new \DOMDocument();
					$xml->preserveWhiteSpace = false;
					$xml->loadXML($objArchive->unzip());
					continue;
				}

				// Limit file operations to files and the templates directory
				if (strncmp($objArchive->file_name, 'files/', 6) !== 0 && strncmp($objArchive->file_name, 'tl_files/', 9) !== 0 && strncmp($objArchive->file_name, 'templates/', 10) !== 0)
				{
					Message::addError(sprintf($GLOBALS['TL_LANG']['ERR']['invalidFile'], $objArchive->file_name));
					continue;
				}

				// Extract the files
				try
				{
					File::putContent($this->customizeUploadPath($objArchive->file_name), $objArchive->unzip());
				}
				catch (\Exception $e)
				{
					Message::addError($e->getMessage());
				}
			}

			// Continue if there is no XML file
			if (!$xml instanceof \DOMDocument)
			{
				Message::addError(sprintf($GLOBALS['TL_LANG']['tl_theme']['missing_xml'], basename($strZipFile)));
				continue;
			}

			$arrMapper = array();
			$tables = $xml->getElementsByTagName('table');
			$arrNewFolders = array();

			// Extract the folder names from the XML file
			for ($i=0; $i<$tables->length; $i++)
			{
				if ($tables->item($i)->getAttribute('name') == 'tl_theme')
				{
					$fields = $tables->item($i)->childNodes->item(0)->childNodes;

					for ($k=0; $k<$fields->length; $k++)
					{
						if ($fields->item($k)->getAttribute('name') == 'folders')
						{
							$arrNewFolders = StringUtil::deserialize($fields->item($k)->nodeValue);
							break;
						}
					}

					break;
				}
			}

			// Sync the new folder(s)
			if (!empty($arrNewFolders) && \is_array($arrNewFolders))
			{
				foreach ($arrNewFolders as $strFolder)
				{
					$strCustomized = $this->customizeUploadPath($strFolder);

					if (Dbafs::shouldBeSynchronized($strCustomized))
					{
						Dbafs::addResource($strCustomized);
					}
				}
			}

			// Lock the tables
			$arrLocks = array
			(
				'tl_files'           => 'WRITE',
				'tl_theme'           => 'WRITE',
				'tl_style_sheet'     => 'WRITE',
				'tl_style'           => 'WRITE',
				'tl_module'          => 'WRITE',
				'tl_layout'          => 'WRITE',
				'tl_image_size'      => 'WRITE',
				'tl_image_size_item' => 'WRITE'
			);

			// Load the DCAs of the locked tables (see #7345)
			foreach (array_keys($arrLocks) as $table)
			{
				$this->loadDataContainer($table);
			}

			$this->Database->lockTables($arrLocks);

			// Get the current auto_increment values
			$tl_files = $this->Database->getNextId('tl_files');
			$tl_theme = $this->Database->getNextId('tl_theme');
			$tl_style_sheet = $this->Database->getNextId('tl_style_sheet');
			$tl_style = $this->Database->getNextId('tl_style');
			$tl_module = $this->Database->getNextId('tl_module');
			$tl_layout = $this->Database->getNextId('tl_layout');
			$tl_image_size = $this->Database->getNextId('tl_image_size');
			$tl_image_size_item = $this->Database->getNextId('tl_image_size_item');

			// Build the mapper data (see #8326)
			for ($i=0; $i<$tables->length; $i++)
			{
				$rows = $tables->item($i)->childNodes;
				$table = $tables->item($i)->getAttribute('name');

				// Skip invalid tables
				if (!\array_key_exists($table, $arrLocks))
				{
					continue;
				}

				// Loop through the rows
				for ($j=0; $j<$rows->length; $j++)
				{
					$fields = $rows->item($j)->childNodes;

					// Loop through the fields
					for ($k=0; $k<$fields->length; $k++)
					{
						// Increment the ID
						if ($fields->item($k)->getAttribute('name') == 'id')
						{
							$arrMapper[$table][$fields->item($k)->nodeValue] = ${$table}++;
							break;
						}
					}
				}
			}

			// Loop through the tables
			for ($i=0; $i<$tables->length; $i++)
			{
				$rows = $tables->item($i)->childNodes;
				$table = $tables->item($i)->getAttribute('name');

				// Skip invalid tables
				if (!\array_key_exists($table, $arrLocks))
				{
					continue;
				}

				// Get the order fields
				$objDcaExtractor = DcaExtractor::getInstance($table);
				$arrOrder = $objDcaExtractor->getOrderFields();

				// Loop through the rows
				for ($j=0; $j<$rows->length; $j++)
				{
					$set = array();
					$fields = $rows->item($j)->childNodes;

					// Loop through the fields
					for ($k=0; $k<$fields->length; $k++)
					{
						$value = $fields->item($k)->nodeValue;
						$name = $fields->item($k)->getAttribute('name');

						// Skip NULL values
						if ($value == 'NULL')
						{
							continue;
						}

						// Increment the ID
						elseif ($name == 'id')
						{
							$value = $arrMapper[$table][$value];
						}

						// Increment the parent IDs
						elseif ($name == 'pid')
						{
							if ($table == 'tl_style')
							{
								$value = $arrMapper['tl_style_sheet'][$value];
							}
							elseif ($table == 'tl_image_size_item')
							{
								$value = $arrMapper['tl_image_size'][$value];
							}
							else
							{
								$value = $arrMapper['tl_theme'][$value];
							}
						}

						// Handle fallback fields
						elseif ($name == 'fallback')
						{
							$value = '';
						}

						// Adjust the style sheet IDs of the page layout
						elseif ($table == 'tl_layout' && $name == 'stylesheet')
						{
							$stylesheets = StringUtil::deserialize($value);

							if (\is_array($stylesheets))
							{
								foreach (array_keys($stylesheets) as $key)
								{
									$stylesheets[$key] = $arrMapper['tl_style_sheet'][$stylesheets[$key]];
								}

								$value = serialize($stylesheets);
							}
						}

						// Adjust the module IDs of the page layout
						elseif ($table == 'tl_layout' && $name == 'modules')
						{
							$modules = StringUtil::deserialize($value);

							if (\is_array($modules))
							{
								foreach ($modules as $key=>$mod)
								{
									if ($mod['mod'] > 0)
									{
										$modules[$key]['mod'] = $arrMapper['tl_module'][$mod['mod']];
									}
								}

								$value = serialize($modules);
							}
						}

						// Adjust duplicate theme and style sheet names
						elseif (($table == 'tl_theme' || $table == 'tl_style_sheet') && $name == 'name')
						{
							$objCount = $this->Database->prepare("SELECT COUNT(*) AS count FROM ". $table ." WHERE name=?")
													   ->execute($value);

							if ($objCount->count > 0)
							{
								$value = preg_replace('/( |\-)[0-9]+$/', '', $value);
								$value .= (($table == 'tl_style_sheet') ? '-' : ' ') . ${$table};
							}
						}

						// Adjust the file paths in style sheets and tl_files
						elseif (($table == 'tl_style_sheet' || $table == 'tl_style' || ($table == 'tl_files' && $name == 'path')) && strpos($value, 'files') !== false)
						{
							$tmp = StringUtil::deserialize($value);

							if (\is_array($tmp))
							{
								foreach ($tmp as $kk=>$vv)
								{
									$tmp[$kk] = $this->customizeUploadPath($vv);
								}

								$value = serialize($tmp);
							}
							else
							{
								$value = $this->customizeUploadPath($value);
							}
						}

						// Replace the file paths in singleSRC fields with their tl_files ID
						elseif ($GLOBALS['TL_DCA'][$table]['fields'][$name]['inputType'] == 'fileTree' && !$GLOBALS['TL_DCA'][$table]['fields'][$name]['eval']['multiple'])
						{
							if (!$value)
							{
								$value = null; // Contao >= 3.2
							}
							else
							{
								// Do not use the FilesModel here – tables are locked!
								$objFile = $this->Database->prepare("SELECT uuid FROM tl_files WHERE path=?")
														  ->limit(1)
														  ->execute($this->customizeUploadPath($value));

								$value = $objFile->uuid;
							}
						}

						// Replace the file paths in multiSRC fields with their tl_files ID
						elseif ($GLOBALS['TL_DCA'][$table]['fields'][$name]['inputType'] == 'fileTree' || \in_array($name, $arrOrder))
						{
							$tmp = StringUtil::deserialize($value);

							if (\is_array($tmp))
							{
								foreach ($tmp as $kk=>$vv)
								{
									// Do not use the FilesModel here – tables are locked!
									$objFile = $this->Database->prepare("SELECT uuid FROM tl_files WHERE path=?")
															  ->limit(1)
															  ->execute($this->customizeUploadPath($vv));

									$tmp[$kk] = $objFile->uuid;
								}

								$value = serialize($tmp);
							}
						}

						// Adjust the imageSize widget data
						elseif ($GLOBALS['TL_DCA'][$table]['fields'][$name]['inputType'] == 'imageSize')
						{
							$imageSizes = StringUtil::deserialize($value, true);

							if (!empty($imageSizes))
							{
								if (is_numeric($imageSizes[2]))
								{
									$imageSizes[2] = $arrMapper['tl_image_size'][$imageSizes[2]];
								}
							}

							$value = serialize($imageSizes);
						}

						$set[$name] = $value;
					}

					// Skip fields that are not in the database (e.g. because of missing extensions)
					foreach ($set as $k=>$v)
					{
						if (!\in_array($k, $arrDbFields[$table]))
						{
							unset($set[$k]);
						}
					}

					// Create the templates folder even if it is empty (see #4793)
					if ($table == 'tl_theme' && isset($set['templates']) && strncmp($set['templates'], 'templates/', 10) === 0 && !is_dir($this->strRootDir . '/' . $set['templates']))
					{
						new Folder($set['templates']);
					}

					// Update tl_files (entries have been created by the Dbafs class)
					if ($table == 'tl_files')
					{
						$this->Database->prepare("UPDATE $table %s WHERE path=?")->set($set)->execute($set['path']);
					}
					else
					{
						$this->Database->prepare("INSERT INTO $table %s")->set($set)->execute();
					}
				}
			}

			// Unlock the tables
			$this->Database->unlockTables();

			// Update the style sheets
			$this->import(StyleSheets::class, 'StyleSheets');
			$this->StyleSheets->updateStyleSheets();

			// Notify the user
			Message::addConfirmation(sprintf($GLOBALS['TL_LANG']['tl_theme']['theme_imported'], basename($strZipFile)));

			// HOOK: add custom logic
			if (isset($GLOBALS['TL_HOOKS']['extractThemeFiles']) && \is_array($GLOBALS['TL_HOOKS']['extractThemeFiles']))
			{
				$intThemeId = empty($arrMapper['tl_theme']) ? null : reset($arrMapper['tl_theme']);

				foreach ($GLOBALS['TL_HOOKS']['extractThemeFiles'] as $callback)
				{
					System::importStatic($callback[0])->{$callback[1]}($xml, $objArchive, $intThemeId, $arrMapper);
				}
			}

			unset($tl_files, $tl_theme, $tl_style_sheet, $tl_style, $tl_module, $tl_layout, $tl_image_size, $tl_image_size_item);
		}

		System::setCookie('BE_PAGE_OFFSET', 0, 0);

		/** @var Session $objSession */
		$objSession = System::getContainer()->get('session');
		$objSession->remove('uploaded_themes');

		$this->import(Automator::class, 'Automator');
		$this->Automator->generateSymlinks();

		$this->redirect(str_replace('&key=importTheme', '', Environment::get('request')));
	}
Extract the theme files and write the data to the database

@param array $arrFiles
@param array $arrDbFields