X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=framework%2Fmain%2Fclasses%2Fstacker%2Ffile%2Fclass_BaseFileStack.php;h=303caca77c7666d0f91e05b18640b50d3c199cc7;hb=HEAD;hp=1960259d04732e4c089505674822aca946646acc;hpb=9aafc2b0b062e10d0fa5d61bfb551938fcf422e2;p=core.git

diff --git a/framework/main/classes/stacker/file/class_BaseFileStack.php b/framework/main/classes/stacker/file/class_BaseFileStack.php
index 1960259d..303caca7 100644
--- a/framework/main/classes/stacker/file/class_BaseFileStack.php
+++ b/framework/main/classes/stacker/file/class_BaseFileStack.php
@@ -1,19 +1,23 @@
 <?php
 // Own namespace
-namespace Org\Mxchange\CoreFramework\Stacker\Filesystem;
+namespace Org\Mxchange\CoreFramework\Stack\File;
 
 // Import framework stuff
-use Org\Mxchange\CoreFramework\Factory\Filesystem\Stack\FileStackIndexFactory;
-use Org\Mxchange\CoreFramework\Factory\ObjectFactory;
-use Org\Mxchange\CoreFramework\FileStack\InvalidMagicException;
+use Org\Mxchange\CoreFramework\Factory\Stack\File\FileStackIndexFactory;
+use Org\Mxchange\CoreFramework\Factory\Object\ObjectFactory;
 use Org\Mxchange\CoreFramework\Filesystem\File\BaseBinaryFile;
+use Org\Mxchange\CoreFramework\Filesystem\File\BinaryFile;
+use Org\Mxchange\CoreFramework\Generic\FrameworkInterface;
 use Org\Mxchange\CoreFramework\Generic\UnsupportedOperationException;
-use Org\Mxchange\CoreFramework\Index\Indexable;
-use Org\Mxchange\CoreFramework\Iterator\Filesystem\SeekableWritableFileIterator;
-use Org\Mxchange\CoreFramework\Stacker\BaseStacker;
-use Org\Mxchange\CoreFramework\Utils\String\StringUtils;
+use Org\Mxchange\CoreFramework\Middleware\Debug\DebugMiddleware;
+use Org\Mxchange\CoreFramework\Stack\BaseStacker;
+use Org\Mxchange\CoreFramework\Traits\Index\IndexableTrait;
+use Org\Mxchange\CoreFramework\Traits\Iterator\IteratorTrait;
+use Org\Mxchange\CoreFramework\Utils\Arrays\ArrayUtils;
+use Org\Mxchange\CoreFramework\Utils\Strings\StringUtils;
 
 // Import SPL stuff
+use \InvalidArgumentException;
 use \SplFileInfo;
 use \UnexpectedValueException;
 
@@ -22,7 +26,7 @@ use \UnexpectedValueException;
  *
  * @author		Roland Haeder <webmaster@ship-simu.org>
  * @version		0.0.0
- * @copyright	Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2020 Core Developer Team
+ * @copyright	Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2023 Core Developer Team
  * @license		GNU GPL 3.0 or any newer version
  * @link		http://www.ship-simu.org
  *
@@ -40,33 +44,17 @@ use \UnexpectedValueException;
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 abstract class BaseFileStack extends BaseStacker {
+	// Load traits
+	use IndexableTrait;
+	use IteratorTrait;
+
 	// Exception codes
 	const EXCEPTION_BAD_MAGIC = 0xe100;
 
 	/**
-	 * Magic for this stack
-	 */
-	const STACK_MAGIC = 'STACKv0.1';
-
-	/**
-	 * Name of array index for gap position
-	 */
-	const ARRAY_INDEX_GAP_POSITION = 'gap';
-
-	/**
-	 * Name of array index for hash
-	 */
-	const ARRAY_INDEX_HASH = 'hash';
-
-	/**
-	 * Name of array index for length of raw data
-	 */
-	const ARRAY_INDEX_DATA_LENGTH = 'length';
-
-	/**
-	 * An instance of an Indexable class
+	 * Minimum block length
 	 */
-	private $indexInstance = NULL;
+	private static $minimumBlockLength = 0;
 
 	/**
 	 * Protected constructor
@@ -79,25 +67,6 @@ abstract class BaseFileStack extends BaseStacker {
 		parent::__construct($className);
 	}
 
-	/**
-	 * Setter for Indexable instance
-	 *
-	 * @param	$indexInstance	An instance of an Indexable class
-	 * @return	void
-	 */
-	protected final function setIndexInstance (Indexable $indexInstance) {
-		$this->indexInstance = $indexInstance;
-	}
-
-	/**
-	 * Getter for Indexable instance
-	 *
-	 * @return	$indexInstance	An instance of an Indexable class
-	 */
-	public final function getIndexInstance () {
-		return $this->indexInstance;
-	}
-
 	/**
 	 * Reads the file header
 	 *
@@ -106,40 +75,49 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @throws	UnexpectedValueException	If header is not proper length
 	 * @throws	InvalidMagicException	If a bad magic was found
 	 */
-	public function readFileHeader () {
+	public function readStackHeader () {
 		// First rewind to beginning as the header sits at the beginning ...
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: CALLED!', __METHOD__, __LINE__));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: CALLED!');
 		$this->getIteratorInstance()->rewind();
 
+		// Get header size
+		$headerSize = $this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize();
+
 		// Then read it (see constructor for calculation)
-		$data = $this->getIteratorInstance()->read($this->getIteratorInstance()->getHeaderSize());
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Read %d bytes (%d wanted).', strlen($data), $this->getIteratorInstance()->getHeaderSize()));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: headerSize=%d', $headerSize));
+		$data = $this->getIteratorInstance()->getBinaryFileInstance()->read($headerSize);
 
 		// Have all requested bytes been read?
-		if (strlen($data) != $this->getIteratorInstance()->getHeaderSize()) {
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Read %d bytes (%d wanted).', strlen($data), $this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize()));
+		if (strlen($data) != $this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize()) {
 			// Bad data length
 			throw new UnexpectedValueException(sprintf('data(%d)=%s does not match iteratorInstance->headerSize=%d',
 				strlen($data),
 				$data,
-				$this->getIteratorInstance()->getHeaderSize()
-			));
+				$this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize()
+			), FrameworkInterface::EXCEPTION_UNEXPECTED_VALUE);
+		} elseif (empty(trim($data, chr(0)))) {
+			// Empty header, file is freshly pre-allocated
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Empty file header detected - EXIT!');
+			return;
 		}
 
 		// Last character must be the separator
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: data(-1)=%s', dechex(ord(substr($data, -1, 1)))));
-		if (substr($data, -1, 1) !== chr(BaseBinaryFile::SEPARATOR_HEADER_ENTRIES)) {
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: data(-1)=0x%s', dechex(ord(substr($data, -1, 1)))));
+		if (substr($data, -1, 1) !== chr(BinaryFile::SEPARATOR_HEADER_ENTRIES)) {
 			// Not valid separator
-			throw new UnexpectedValueException(sprintf('data=%s does not have separator=%s at the end.',
+			throw new UnexpectedValueException(sprintf('data=%s does not have separator=0x%s at the end.',
 				$data,
-				BaseBinaryFile::SEPARATOR_HEADER_ENTRIES
-			));
+				dechex(BinaryFile::SEPARATOR_HEADER_ENTRIES)
+			), FrameworkInterface::EXCEPTION_UNEXPECTED_VALUE);
 		}
 
 		// Okay, then remove it
 		$data = substr($data, 0, -1);
 
 		// And update seek position
-		$this->getIteratorInstance()->updateSeekPosition();
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->iteratorInstance->binaryFileInstance->updateSeekPosition() ...');
+		$this->getIteratorInstance()->getBinaryFileInstance()->updateSeekPosition();
 
 		/*
 		 * Now split it:
@@ -148,47 +126,56 @@ abstract class BaseFileStack extends BaseStacker {
 		 * 1 => total entries
 		 * 2 => current seek position
 		 */
-		$header = explode(chr(BaseBinaryFile::SEPARATOR_HEADER_DATA), $data);
+		$header = explode(chr(BinaryFile::SEPARATOR_HEADER_DATA), $data);
 
-		// Set header here
-		$this->getIteratorInstance()->setHeader($header);
+		// Map numeric indexes to associative indexes
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Invoking ArrayUtils::mapNumericKeysToAssociative(%d) ...', count($header)));
+		$header = ArrayUtils::mapNumericKeysToAssociative($header, [
+			BinaryFile::HEADER_NAME_MAGIC,
+			BinaryFile::HEADER_NAME_TOTAL_ENTRIES,
+			BinaryFile::HEADER_NAME_SEEK_POSITION,
+		]);
 
 		// Check if the array has only 3 elements
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: header(%d)=%s', count($header), print_r($header, true)));
-		if (count($header) != 3) {
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: HEADER_STACK_ELEMENT_COUNT=%d,header()=%d', BinaryFile::HEADER_STACK_ELEMENT_COUNT, count($header)));
+		//* PRINTR-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: HEADER_STACK_ELEMENT_COUNT=%d,header(%d)=%s', BinaryFile::HEADER_STACK_ELEMENT_COUNT, count($header), print_r($header, true)));
+		if (count($header) != BinaryFile::HEADER_STACK_ELEMENT_COUNT) {
 			// Header array count is not expected
-			throw new UnexpectedValueException(sprintf('data=%s has %d elements, expected 3',
+			throw new UnexpectedValueException(sprintf('data=%s has %d elements, but expected is %d',
 				$data,
-				count($header)
-			));
-		} elseif ($header[0] != self::STACK_MAGIC) {
+				count($header),
+				BinaryFile::HEADER_STACK_ELEMENT_COUNT
+			), FrameworkInterface::EXCEPTION_UNEXPECTED_VALUE);
+		} elseif ($header[BinaryFile::HEADER_NAME_MAGIC] != StackableFile::STACK_MAGIC) {
 			// Bad magic
 			throw new InvalidMagicException($data, self::EXCEPTION_BAD_MAGIC);
-		}
-
-		// Check length of count and seek position
-		if (strlen($header[1]) != BaseBinaryFile::LENGTH_COUNT) {
+		} elseif (strlen($header[BinaryFile::HEADER_NAME_TOTAL_ENTRIES]) != BinaryFile::LENGTH_COUNT) {
 			// Count length not valid
-			throw new UnexpectedValueException(sprintf('header[1](%d)=%s is not expected %d length',
-				strlen($header[1]),
-				$header[1],
-				BaseBinaryFile::LENGTH_COUNT
-			));
-		} elseif (strlen($header[1]) != BaseBinaryFile::LENGTH_POSITION) {
+			throw new UnexpectedValueException(sprintf('header[%s](%d)=%s is not expected %d length',
+				BinaryFile::HEADER_NAME_TOTAL_ENTRIES,
+				strlen($header[BinaryFile::HEADER_NAME_TOTAL_ENTRIES]),
+				$header[BinaryFile::HEADER_NAME_TOTAL_ENTRIES],
+				BinaryFile::LENGTH_COUNT
+			), FrameworkInterface::EXCEPTION_UNEXPECTED_VALUE);
+		} elseif (strlen($header[BinaryFile::HEADER_NAME_SEEK_POSITION]) != BinaryFile::LENGTH_POSITION) {
 			// Position length not valid
-			throw new UnexpectedValueException(sprintf('header[2](%d)=%s is not expected %d length',
-				strlen($header[1]),
-				$header[1],
-				BaseBinaryFile::LENGTH_POSITION
-			));
+			throw new UnexpectedValueException(sprintf('header[%s](%d)=%s is not expected %d length',
+				BinaryFile::HEADER_NAME_SEEK_POSITION,
+				strlen($header[BinaryFile::HEADER_NAME_SEEK_POSITION]),
+				$header[BinaryFile::HEADER_NAME_SEEK_POSITION],
+				BinaryFile::LENGTH_POSITION
+			), FrameworkInterface::EXCEPTION_UNEXPECTED_VALUE);
 		}
 
 		// Decode count and seek position
-		$header[1] = hex2bin($header[1]);
-		$header[2] = hex2bin($header[2]);
+		$header[BinaryFile::HEADER_NAME_TOTAL_ENTRIES] = hex2bin($header[BinaryFile::HEADER_NAME_TOTAL_ENTRIES]);
+		$header[BinaryFile::HEADER_NAME_SEEK_POSITION] = hex2bin($header[BinaryFile::HEADER_NAME_SEEK_POSITION]);
+
+		// Set header here
+		$this->getIteratorInstance()->getBinaryFileInstance()->setHeader($header);
 
 		// Trace message
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: EXIT!', __METHOD__, __LINE__));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: EXIT!');
 	}
 
 	/**
@@ -198,32 +185,33 @@ abstract class BaseFileStack extends BaseStacker {
 	 */
 	public function flushFileHeader () {
 		// Put all informations together
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: CALLED!', __METHOD__, __LINE__));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: CALLED!');
 		$header = sprintf('%s%s%s%s%s%s',
 			// Magic
-			self::STACK_MAGIC,
+			StackableFile::STACK_MAGIC,
 
 			// Separator magic<->count
-			chr(BaseBinaryFile::SEPARATOR_HEADER_DATA),
+			chr(BinaryFile::SEPARATOR_HEADER_DATA),
 
-			// Total entries (will be zero) and pad it to 20 chars
-			str_pad(StringUtils::dec2hex($this->getIteratorInstance()->getCounter()), BaseBinaryFile::LENGTH_COUNT, '0', STR_PAD_LEFT),
+			// Padded total entries
+			str_pad(StringUtils::dec2hex($this->getIteratorInstance()->getBinaryFileInstance()->getCounter()), BinaryFile::LENGTH_COUNT, '0', STR_PAD_LEFT),
 
 			// Separator count<->seek position
-			chr(BaseBinaryFile::SEPARATOR_HEADER_DATA),
+			chr(BinaryFile::SEPARATOR_HEADER_DATA),
 
-			// Position (will be zero)
-			str_pad(StringUtils::dec2hex($this->getIteratorInstance()->getSeekPosition(), 2), BaseBinaryFile::LENGTH_POSITION, '0', STR_PAD_LEFT),
+			// Padded seek position
+			str_pad(StringUtils::dec2hex($this->getIteratorInstance()->getBinaryFileInstance()->getSeekPosition(), 2), BinaryFile::LENGTH_POSITION, '0', STR_PAD_LEFT),
 
 			// Separator position<->entries
-			chr(BaseBinaryFile::SEPARATOR_HEADER_ENTRIES)
+			chr(BinaryFile::SEPARATOR_HEADER_ENTRIES)
 		);
 
 		// Write it to disk (header is always at seek position 0)
-		$this->getIteratorInstance()->writeData(0, $header, false);
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Invoking this->iteratorInstance->writeAtPosition(0, header=%s) ...', $header));
+		$this->getIteratorInstance()->getBinaryFileInstance()->writeAtPosition(0, $header);
 
 		// Trace message
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: EXIT!', __METHOD__, __LINE__));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: EXIT!');
 	}
 
 	/**
@@ -232,55 +220,88 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @param	$fileInfoInstance	An instance of a SplFileInfo class
 	 * @param	$type		Type of this stack (e.g. url_source for URL sources)
 	 * @return	void
+	 * @throws	InvalidArgumentException	If a parameter is invalid
 	 * @todo	Currently the stack file is not cached, please implement a memory-handling class and if enough RAM is found, cache the whole stack file.
 	 */
 	protected function initFileStack (SplFileInfo $fileInfoInstance, string $type) {
+		// Validate parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: fileInfoInstance[%s]=%s,type=%s - CALLED!', get_class($fileInfoInstance), $fileInfoInstance, $type));
+		if (empty($type)) {
+			// Invalid parameter
+			throw new InvalidArgumentException('Parameter "type" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		}
+
 		// Get a stack file instance
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: fileInfoInstance=%s,type=%s - CALLED!', $fileInfoInstance, $type));
-		$fileInstance = ObjectFactory::createObjectByConfiguredName('stack_file_class', array($fileInfoInstance, $this));
+		$stackInstance = ObjectFactory::createObjectByConfiguredName('stack_file_class', array($fileInfoInstance, $this));
 
 		// Get iterator instance
-		$iteratorInstance = ObjectFactory::createObjectByConfiguredName('file_iterator_class', array($fileInstance));
+		$iteratorInstance = ObjectFactory::createObjectByConfiguredName('file_iterator_class', array($stackInstance));
 
 		// Set iterator here
 		$this->setIteratorInstance($iteratorInstance);
 
 		// Calculate header size
-		$this->getIteratorInstance()->setHeaderSize(
-			strlen(self::STACK_MAGIC) +
-			strlen(chr(BaseBinaryFile::SEPARATOR_HEADER_DATA)) +
-			BaseBinaryFile::LENGTH_COUNT +
-			strlen(chr(BaseBinaryFile::SEPARATOR_HEADER_DATA)) +
-			BaseBinaryFile::LENGTH_POSITION +
-			strlen(chr(BaseBinaryFile::SEPARATOR_HEADER_ENTRIES))
+		$headerSize = (
+			strlen(StackableFile::STACK_MAGIC) +
+			strlen(chr(BinaryFile::SEPARATOR_HEADER_DATA)) +
+			BinaryFile::LENGTH_COUNT +
+			strlen(chr(BinaryFile::SEPARATOR_HEADER_DATA)) +
+			BinaryFile::LENGTH_POSITION +
+			strlen(chr(BinaryFile::SEPARATOR_HEADER_ENTRIES))
 		);
 
-		// Init counters and gaps array
-		$this->getIteratorInstance()->initCountersGapsArray();
+		// Setting it
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Setting headerSize=%d ...', $headerSize));
+		$this->getIteratorInstance()->getBinaryFileInstance()->setHeaderSize($headerSize);
 
-		// Is the file's header initialized?
-		if (!$this->getIteratorInstance()->isFileHeaderInitialized()) {
-			// No, then create it (which may pre-allocate the stack)
-			$this->getIteratorInstance()->createFileHeader();
-
-			// And pre-allocate a bit
-			$this->getIteratorInstance()->preAllocateFile('file_stack');
-		}
-
-		// Load the file header
-		$this->readFileHeader();
-
-		// Count all entries in file
-		$this->getIteratorInstance()->analyzeFile();
+		// Init counters and gaps array
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->iteratorInstance->initCountersGapsArray() ...');
+		$this->getIteratorInstance()->getBinaryFileInstance()->initCountersGapsArray();
 
 		/*
 		 * Get stack index instance. This can be used for faster
 		 * "defragmentation" and startup.
 		 */
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Creating index instance for fileInfoInstance[%s]=%s,type=%s ...', get_class($fileInfoInstance), $fileInfoInstance, $type));
 		$indexInstance = FileStackIndexFactory::createFileStackIndexInstance($fileInfoInstance, $type);
 
 		// And set it here
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: indexInstance=%s', $indexInstance->__toString()));
 		$this->setIndexInstance($indexInstance);
+
+		// Is the file's header initialized?
+		if (!$this->getIteratorInstance()->getBinaryFileInstance()->isFileHeaderInitialized()) {
+			// First pre-allocate a bit
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->iteratorInstance->preAllocateFile(file_stack) ...');
+			$this->getIteratorInstance()->getBinaryFileInstance()->preAllocateFile('file_stack');
+
+			// Then create file header
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: this->iteratorInstance->createFileHeader() ...');
+			$this->getIteratorInstance()->getBinaryFileInstance()->createFileHeader();
+		}
+
+		// Load the file header
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->readStackHeader() ...');
+		$this->readStackHeader();
+
+		// Is the index loaded correctly, e.g. the stack file is just created?
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->indexInstance->isIndexLoaded() ...');
+		if (!$this->getIndexInstance()->isIndexLoaded()) {
+			/*
+			 * Something horrible has happened to the index as it should be
+			 * loaded at this point. The stack's file structure then needs to
+			 * be analyzed and the index rebuild.
+			 */
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Invoking this->iteratorInstance->analyzeFileStructure() ...');
+			$this->getIteratorInstance()->getBinaryFileInstance()->analyzeFileStructure();
+
+			// Rebuild index from file
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Invoking this->iteratorInstance->rebuildIndexFromStack(%s) ...', $this->__toString()));
+			$this->getIndexInstance()->rebuildIndexFromStack($this);
+		}
+
+		// Trace message
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: EXIT!');
 	}
 
 	/**
@@ -290,14 +311,19 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @param	$value			Value to add to this stacker
 	 * @return	void
 	 * @throws	FullStackerException	If the stack is full
+	 * @throws	InvalidArgumentException	If a parameter is not valid
 	 * @throws	InvalidArgumentException	Not all variable types are wanted here
 	 */
-	protected function addValue (string $stackerName, $value) {
-		// Do some tests
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('stackerName=%s,value[%s]=%s - CALLED!', $stackerName, gettype($value), print_r($value, true)));
-		if ($this->isStackFull($stackerName)) {
+	protected function addValueToStack (string $stackerName, $value) {
+		// Validate parameter
+		/* PRINTR-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s,value[]=%s - CALLED!', $stackerName, gettype($value)));
+		//* PRINTR-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s,value[%s]=%s', $stackerName, gettype($value), print_r($value, true)));
+		if (empty($stackerName)) {
+			// No empty stack name
+			throw new InvalidArgumentException('Parameter "stackerName" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		} elseif ($this->isStackFull($stackerName)) {
 			// Stacker is full
-			throw new FullStackerException(array($this, $stackerName, $value), self::EXCEPTION_STACKER_IS_FULL);
+			throw new BadMethodCallException(sprintf('stackerName=%s is full but method call.', $stackerName), FrameworkInterface::EXCEPTION_BAD_METHOD_CALL);
 		} elseif (is_resource($value) || is_object($value)) {
 			// Not wanted type
 			throw new InvalidArgumentException(sprintf('value[]=%s is not supported', gettype($value)));
@@ -307,10 +333,16 @@ abstract class BaseFileStack extends BaseStacker {
 		 * Now add the value to the file stack which returns gap position, a
 		 * hash and length of the raw data.
 		 */
-		$data = $this->getIteratorInstance()->writeValueToFile($stackerName, $value);
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Invoking this->iteratorInstance->binaryFileInstance->writeValueToFile(%s,value[]=%s) ...', $stackerName, gettype($value)));
+		$data = $this->getIteratorInstance()->getBinaryFileInstance()->writeValueToFile($stackerName, $value);
 
 		// Add the hash and gap position to the index
-		$this->getIndexInstance()->addHashToIndex($stackerName, $data);
+		//* PRINTR-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: data=%s', print_r($data, true));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Invoking this->indexInstance->addHashedDataToIndex(%s,data()=%d) ...', $stackerName, count($data)));
+		$this->getIndexInstance()->addHashedDataToIndex($stackerName, $data);
+
+		// Trace message
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: EXIT!');
 	}
 
 	/**
@@ -318,20 +350,26 @@ abstract class BaseFileStack extends BaseStacker {
 	 *
 	 * @param	$stackerName	Name of the stack
 	 * @return	$value			Value of last added value
-	 * @throws	EmptyStackerException	If the stack is empty
+	 * @throws	InvalidArgumentException	If a parameter is not valid
+	 * @throws	BadMethodCallException	If the stack is empty
 	 */
 	protected function getLastValue (string $stackerName) {
-		// Is the stack not yet initialized or full?
-		if ($this->isStackEmpty($stackerName)) {
+		// Validate parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+		if (empty($stackerName)) {
+			// No empty stack name
+			throw new InvalidArgumentException('Parameter "stackerName" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		} elseif ($this->isStackEmpty($stackerName)) {
 			// Throw an exception
-			throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
-		} // END - if
+			throw new BadMethodCallException([$this, $stackerName], FrameworkInterface::EXCEPTION_BAD_METHOD_CALL);
+		}
 
 		// Now get the last value
-		/* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
+		/* NOISY-DEBUG: */ DebugMiddleware::getSelfInstance()->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
 		$value = NULL;
 
 		// Return it
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: value[]=%s - EXIT!', gettype($value)));
 		return $value;
 	}
 
@@ -340,20 +378,26 @@ abstract class BaseFileStack extends BaseStacker {
 	 *
 	 * @param	$stackerName	Name of the stack
 	 * @return	$value			Value of last added value
-	 * @throws	EmptyStackerException	If the stack is empty
+	 * @throws	InvalidArgumentException	If a parameter is not valid
+	 * @throws	BadMethodCallException	If the stack is empty
 	 */
 	protected function getFirstValue (string $stackerName) {
-		// Is the stack not yet initialized or full?
-		if ($this->isStackEmpty($stackerName)) {
+		// Validate parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+		if (empty($stackerName)) {
+			// No empty stack name
+			throw new InvalidArgumentException('Parameter "stackerName" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		} elseif ($this->isStackEmpty($stackerName)) {
 			// Throw an exception
-			throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
-		} // END - if
+			throw new BadMethodCallException([$this, $stackerName], FrameworkInterface::EXCEPTION_BAD_METHOD_CALL);
+		}
 
 		// Now get the first value
-		/* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
+		/* NOISY-DEBUG: */ DebugMiddleware::getSelfInstance()->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
 		$value = NULL;
 
 		// Return it
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: value[]=%s - EXIT!', gettype($value)));
 		return $value;
 	}
 
@@ -362,17 +406,22 @@ abstract class BaseFileStack extends BaseStacker {
 	 *
 	 * @param	$stackerName	Name of the stack
 	 * @return	$value			Value "poped" from array
-	 * @throws	EmptyStackerException	If the stack is empty
+	 * @throws	InvalidArgumentException	If a parameter is not valid
+	 * @throws	BadMethodCallException	If the stack is empty
 	 */
 	protected function popLast (string $stackerName) {
-		// Is the stack not yet initialized or full?
-		if ($this->isStackEmpty($stackerName)) {
+		// Validate parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+		if (empty($stackerName)) {
+			// No empty stack name
+			throw new InvalidArgumentException('Parameter "stackerName" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		} elseif ($this->isStackEmpty($stackerName)) {
 			// Throw an exception
-			throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
-		} // END - if
+			throw new BadMethodCallException([$this, $stackerName], FrameworkInterface::EXCEPTION_BAD_METHOD_CALL);
+		}
 
 		// Now, remove the last entry, we don't care about the return value here, see elseif() block above
-		/* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
+		/* NOISY-DEBUG: */ DebugMiddleware::getSelfInstance()->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
 		return NULL;
 	}
 
@@ -381,17 +430,22 @@ abstract class BaseFileStack extends BaseStacker {
 	 *
 	 * @param	$stackerName	Name of the stack
 	 * @return	$value			Value "shifted" from array
-	 * @throws	EmptyStackerException	If the named stacker is empty
+	 * @throws	InvalidArgumentException	If a parameter is not valid
+	 * @throws	BadMethodCallException	If the named stacker is empty
 	 */
 	protected function popFirst (string $stackerName) {
-		// Is the stack not yet initialized or full?
-		if ($this->isStackEmpty($stackerName)) {
+		// Validate parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+		if (empty($stackerName)) {
+			// No empty stack name
+			throw new InvalidArgumentException('Parameter "stackerName" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		} elseif ($this->isStackEmpty($stackerName)) {
 			// Throw an exception
-			throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
-		} // END - if
+			throw new BadMethodCallException([$this, $stackerName], FrameworkInterface::EXCEPTION_BAD_METHOD_CALL);
+		}
 
 		// Now, remove the last entry, we don't care about the return value here, see elseif() block above
-		/* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
+		/* NOISY-DEBUG: */ DebugMiddleware::getSelfInstance()->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
 		return NULL;
 	}
 
@@ -400,13 +454,22 @@ abstract class BaseFileStack extends BaseStacker {
 	 *
 	 * @param	$stackerName	Name of the stack
 	 * @return	$isFull			Whether the stack is full
+	 * @throws	InvalidArgumentException	If a parameter is not valid
 	 */
 	protected function isStackFull (string $stackerName) {
-		// File-based stacks will only run full if the disk space is low.
+		// Validate parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+		if (empty($stackerName)) {
+			// No empty stack name
+			throw new InvalidArgumentException('Parameter "stackerName" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		}
+
 		// @TODO Please implement this, returning false
+		/* NOISY-DEBUG: */ DebugMiddleware::getSelfInstance()->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
 		$isFull = false;
 
 		// Return result
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: isFull=%d - EXIT!', intval($isFull)));
 		return $isFull;
 	}
 
@@ -415,38 +478,25 @@ abstract class BaseFileStack extends BaseStacker {
 	 *
 	 * @param	$stackerName		Name of the stack
 	 * @return	$isEmpty			Whether the stack is empty
-	 * @throws	NoStackerException	If given stack is missing
+	 * @throws	InvalidArgumentException	If a parameter is not valid
+	 * @throws	BadMethodCallException	If given stack is missing
 	 */
 	public function isStackEmpty (string $stackerName) {
+		// Validate parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+		if (empty($stackerName)) {
+			// No empty stack name
+			throw new InvalidArgumentException('Parameter "stackerName" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		}
+
 		// So, is the stack empty?
 		$isEmpty = (($this->getStackCount($stackerName)) == 0);
 
 		// Return result
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: isEmpty=%d - EXIT!', intval($isEmpty)));
 		return $isEmpty;
 	}
 
-	/**
-	 * Initializes given stacker
-	 *
-	 * @param	$stackerName	Name of the stack
-	 * @param	$forceReInit	Force re-initialization
-	 * @return	void
-	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
-	 */
-	public function initStack (string $stackerName, bool $forceReInit = false) {
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
-	}
-
-	/**
-	 * Initializes all stacks
-	 *
-	 * @return	void
-	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
-	 */
-	public function initStacks (array $stacks, bool $forceReInit = false) {
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
-	}
-
 	/**
 	 * Checks whether the given stack is initialized (set in array $stackers)
 	 *
@@ -455,7 +505,7 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
 	 */
 	public function isStackInitialized (string $stackerName) {
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
@@ -465,7 +515,7 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
 	 */
 	public function isEndOfFileReached () {
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
@@ -476,7 +526,12 @@ abstract class BaseFileStack extends BaseStacker {
 	 */
 	public function getStackCount (string $stackerName) {
 		// Now, simply return the found count value, this must be up-to-date then!
-		return $this->getIteratorInstance()->getCounter();
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+		$count = $this->getIteratorInstance()->getBinaryFileInstance()->getCounter();
+
+		// Return count
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: count=%d - EXIT!', $count));
+		return $count;
 	}
 
 	/**
@@ -485,30 +540,36 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @return	$length		Minimum length for one entry/block
 	 */
 	public function calculateMinimumBlockLength () {
-		// Calulcate it
-		$length =
-			// Length of entry group
-			BaseBinaryFile::LENGTH_GROUP + strlen(chr(BaseBinaryFile::SEPARATOR_GROUP_HASH)) +
-			// Hash + value
-			self::getHashLength() + strlen(chr(BaseBinaryFile::SEPARATOR_HASH_VALUE)) + 1 +
-			// Final separator
-			strlen(chr(BaseBinaryFile::SEPARATOR_ENTRIES));
+		// Is the value "cached"?
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: CALLED!');
+		if (self::$minimumBlockLength == 0) {
+			// Calulcate it
+			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: Calculating ...');
+			self::$minimumBlockLength =
+				// Length of entry group
+				BinaryFile::LENGTH_GROUP + strlen(chr(BinaryFile::SEPARATOR_GROUP_HASH)) +
+				// Hash + value
+				self::getHashLength() + strlen(chr(BinaryFile::SEPARATOR_HASH_VALUE)) + 1 +
+				// Final separator
+				strlen(chr(BinaryFile::SEPARATOR_ENTRIES));
+		}
 
 		// Return it
-		return $length;
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: self::minimumBlockLength=%d - EXIT!', self::$minimumBlockLength));
+		return self::$minimumBlockLength;
 	}
 
 	/**
 	 * Initializes counter for valid entries, arrays for damaged entries and
 	 * an array for gap seek positions. If you call this method on your own,
 	 * please re-analyze the file structure. So you are better to call
-	 * analyzeFile() instead of this method.
+	 * analyzeFileStructure() instead of this method.
 	 *
 	 * @return	void
 	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
 	 */
 	public function initCountersGapsArray () {
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
@@ -518,7 +579,7 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
 	 */
 	public final function getHeaderSize () {
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
@@ -529,7 +590,7 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
 	 */
 	public final function setHeaderSize (int $headerSize) {
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
@@ -539,7 +600,7 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
 	 */
 	public final function getHeader () {
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
@@ -550,7 +611,7 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
 	 */
 	public final function setHeader (array $header) {
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
@@ -560,7 +621,7 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
 	 */
 	public function updateSeekPosition () {
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
@@ -570,7 +631,7 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
 	 */
 	public final function getCounter () {
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
@@ -583,21 +644,33 @@ abstract class BaseFileStack extends BaseStacker {
 	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
 	 */
 	public function writeData (int $seekPosition, string $data, bool $flushHeader = true) {
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: seekPosition=%s,data[]=%s,flushHeader=%d', $seekPosition, gettype($data), intval($flushHeader)));
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+		// Not supported
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
+	}
+
+	/**
+	 * Writes at given position by seeking to it.
+	 *
+	 * @param	$seekPosition	Seek position in file
+	 * @param	$dataStream		Data to be written
+	 * @return	mixed			Number of writes bytes or false on error
+	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
+	 */
+	public function writeAtPosition (int $seekPosition, string $dataStream) {
+		// Not supported
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
 	 * Writes given value to the file and returns a hash and gap position for it
 	 *
-	 * @param	$groupId	Group identifier
+	 * @param	$stackName	Group identifier
 	 * @param	$value		Value to be added to the stack
 	 * @return	$data		Hash and gap position
 	 * @throws	UnsupportedOperationException	This method is not (and maybe never will be) supported
 	 */
-	public function writeValueToFile (string $groupId, $value) {
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: groupId=%s,value[%s]=%s', $groupId, gettype($value), print_r($value, true)));
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+	public function writeValueToFile (string $stackName, $value) {
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
@@ -610,8 +683,7 @@ abstract class BaseFileStack extends BaseStacker {
 	 */
 	public function searchNextGap (int $length) {
 		// Not supported here
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: length=%d - CALLED!', $length));
-		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
+		throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getBinaryFileInstance()), FrameworkInterface::EXCEPTION_UNSPPORTED_OPERATION);
 	}
 
 	/**
@@ -621,52 +693,71 @@ abstract class BaseFileStack extends BaseStacker {
 	 */
 	public function getFileSize () {
 		// Call iterator's method
-		return $this->getIteratorInstance()->getFileSize();
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: CALLED!');
+		$size = $this->getIteratorInstance()->getBinaryFileInstance()->getFileSize();
+
+		// Return size
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: size=%d - EXIT!', $size));
+		return $size;
 	}
 
 	/**
 	 * Writes given raw data to the file and returns a gap position and length
 	 *
-	 * @param	$groupId	Group identifier
+	 * @param	$stackName	Group identifier
 	 * @param	$hash		Hash from encoded value
 	 * @param	$encoded	Encoded value to be written to the file
 	 * @return	$data		Gap position and length of the raw data
-	 */
-	public function writeDataToFreeGap (string $groupId, string $hash, string $encoded) {
+	 * @throws	InvalidArgumentException	If a parameter has an invalid value
+	 */
+	public function writeDataToFreeGap (string $stackName, string $hash, string $encoded) {
+		// Check parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackName=%s,hash{}=0x%s,encoded()=%d - CALLED!', $stackName, bin2hex($hash), strlen($encoded)));
+		if (empty($stackName)) {
+			// Throw IAE
+			throw new InvalidArgumentException('Parameter "stackName" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		} elseif (empty($hash)) {
+			// Throw IAE
+			throw new InvalidArgumentException('Parameter "hash" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		} elseif (empty($encoded)) {
+			// Throw IAE
+			throw new InvalidArgumentException('Parameter "encoded" is empty', FrameworkInterface::EXCEPTION_INVALID_ARGUMENT);
+		}
+
 		// Raw data been written to the file
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: groupId=%s,hash=%s,encoded()=%d - CALLED!', $groupId, $hash, strlen($encoded)));
 		$rawData = sprintf('%s%s%s%s%s',
-			$groupId,
-			BaseBinaryFile::SEPARATOR_GROUP_HASH,
-			hex2bin($hash),
-			BaseBinaryFile::SEPARATOR_HASH_VALUE,
+			$stackName,
+			BinaryFile::SEPARATOR_GROUP_HASH,
+			$hash,
+			BinaryFile::SEPARATOR_HASH_VALUE,
 			$encoded
 		);
 
 		// Search for next free gap
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: groupId=%s,hash=%s,rawData()=%d', $groupId, $hash, strlen($rawData)));
-		$gapPosition = $this->getIteratorInstance()->searchNextGap(strlen($rawData));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackName=%s,hash{}=0x%s,rawData()=%d', $stackName, bin2hex($hash), strlen($rawData)));
+		$gapPosition = $this->getIteratorInstance()->getBinaryFileInstance()->searchNextGap(strlen($rawData));
 
 		// Gap position cannot be smaller than header length + 1
-		if ($gapPosition <= $this->getIteratorInstance()->getHeaderSize()) {
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: gapPosition=%d', $gapPosition));
+		if ($gapPosition <= $this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize()) {
 			// Improper gap position
 			throw new UnexpectedValueException(sprintf('gapPosition[%s]=%d is not larger than headerSize=%d',
 				gettype($gapPosition),
 				$gapPosition,
-				$this->getIteratorInstance()->getHeaderSize()
-			));
+				$this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize()
+			), FrameworkInterface::EXCEPTION_UNEXPECTED_VALUE);
 		}
 
 		// Then write the data at that gap
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: groupId=%s,hash=%s,gapPosition=%s', $groupId, $hash, $gapPosition));
-		$this->getIteratorInstance()->writeData($gapPosition, $rawData);
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackName=%s,hash{}=0x%s,gapPosition=%s', $stackName, bin2hex($hash), $gapPosition));
+		$this->getIteratorInstance()->getBinaryFileInstance()->writeData($gapPosition, $rawData);
 
 		// Return gap position, hash and length of raw data
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: groupId=%s,hash=%s,rawData()=%d - EXIT!', $groupId, $hash, strlen($rawData)));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackName=%s,hash{}=0x%s,rawData()=%d - EXIT!', $stackName, bin2hex($hash), strlen($rawData)));
 		return [
-			self::ARRAY_INDEX_GAP_POSITION => $gapPosition,
-			self::ARRAY_INDEX_HASH         => $hash,
-			self::ARRAY_INDEX_DATA_LENGTH  => strlen($rawData),
+			StackableFile::ARRAY_NAME_GAP_POSITION => $gapPosition,
+			StackableFile::ARRAY_NAME_HASH         => $hash,
+			StackableFile::ARRAY_NAME_DATA_LENGTH  => strlen($rawData),
 		];
 	}