From: Roland Häder <roland@mxchange.org>
Date: Sat, 5 Dec 2020 23:56:23 +0000 (+0100)
Subject: Continued:
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=6e64aa2cb0fbd5a3c712a6a15e08399b1120cc67;p=core.git

Continued:
- validated more parameters to avoid bad invocation with invalid values
- int $bytes = NULL was my default, SPL says 0, not NULL as default value
- improved logger messages by adding type and all parameters

Signed-off-by: Roland Häder <roland@mxchange.org>
---

diff --git a/framework/main/classes/file_directories/binary/class_BaseBinaryFile.php b/framework/main/classes/file_directories/binary/class_BaseBinaryFile.php
index 6ba224e4..4ea56c68 100644
--- a/framework/main/classes/file_directories/binary/class_BaseBinaryFile.php
+++ b/framework/main/classes/file_directories/binary/class_BaseBinaryFile.php
@@ -409,15 +409,16 @@ abstract class BaseBinaryFile extends BaseAbstractFile {
 	/**
 	 * Initializes this file class
 	 *
-	 * @param	$infoInstance	An instance of a SplFileInfo class
+	 * @param	$fileInfoInstance	An instance of a SplFileInfo class
 	 * @return	void
 	 */
-	protected function initFile (SplFileInfo $infoInstance) {
+	protected function initFile (SplFileInfo $fileInfoInstance) {
 		// Get a file i/o pointer instance
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: infoInstance=%s - CALLED!', $infoInstance));
-		$pointerInstance = ObjectFactory::createObjectByConfiguredName('file_raw_input_output_class', array($infoInstance));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: fileInfoInstance[%s]=%s - CALLED!', get_class($fileInfoInstance), $fileInfoInstance));
+		$pointerInstance = ObjectFactory::createObjectByConfiguredName('file_raw_input_output_class', array($fileInfoInstance));
 
 		// ... and set it here
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: Setting pointerInstance=%s ...', $pointerInstance->__toString()));
 		$this->setPointerInstance($pointerInstance);
 
 		// Trace message
@@ -431,10 +432,20 @@ abstract class BaseBinaryFile extends BaseAbstractFile {
 	 * @param	$data			Data to be written
 	 * @param	$flushHeader	Whether to flush the header (default: flush)
 	 * @return	void
+	 * @throws	InvalidArgumentException	If a parameter is invalid
 	 */
 	public function writeData (int $seekPosition, string $data, bool $flushHeader = true) {
-		// Write data at given position
+		// Validate parameter
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: seekPosition=%s,data()=%d,flushHeader=%d - CALLED!', $seekPosition, strlen($data), intval($flushHeader)));
+		if ($seekPosition < 0) {
+			// Invalid seek position
+			throw new InvalidArgumentException(sprintf('seekPosition=%d is not valid', $seekPosition));
+		} elseif (empty($data)) {
+			// Empty data is invalid, too
+			throw new InvalidArgumentException('Parameter "data" is empty');
+		}
+
+		// Write data at given position
 		$this->getPointerInstance()->writeAtPosition($seekPosition, $data);
 
 		// Increment counter
@@ -461,10 +472,17 @@ abstract class BaseBinaryFile extends BaseAbstractFile {
 	 *
 	 * @param	$length		Length of the block
 	 * @return	void
+	 * @throws	InvalidArgumentException	If a parameter is invalid
 	 */
 	protected function markCurrentBlockAsEmpty (int $length) {
-		// Get current seek position
+		// Validate parameter
 		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: length=%d - CALLED!', $length));
+		if ($length < 1) {
+			// Length cannot below one
+			throw new InvalidArgumentException(sprintf('length=%d is not valid', $length));
+		}
+
+		// Get current seek position
 		$currentPosition = $this->key();
 
 		// Now add it as gap entry
@@ -491,12 +509,12 @@ abstract class BaseBinaryFile extends BaseAbstractFile {
 		if ($this->isFileInitialized()) {
 			// Some bytes has been written, so rewind to start of it.
 			$rewindStatus = $this->rewind();
-			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('rewindStatus=%s', $rewindStatus));
 
 			// Is the rewind() call successfull?
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: rewindStatus=%d', $rewindStatus));
 			if ($rewindStatus != 1) {
 				// Something bad happened
-				self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('Could not rewind().'));
+				self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-BINARY-FILE: Could not rewind().');
 			}
 
 			// Read file header
@@ -507,7 +525,7 @@ abstract class BaseBinaryFile extends BaseAbstractFile {
 		}
 
 		// Return result
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('isInitialized=%d - EXIT!', intval($isInitialized)));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: isInitialized=%d - EXIT!', intval($isInitialized)));
 		return $isInitialized;
 	}
 
@@ -517,11 +535,10 @@ abstract class BaseBinaryFile extends BaseAbstractFile {
 	 * @return	$isInitialized		Whether the file's size is zero
 	 */
 	public function isFileInitialized () {
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-BINARY-FILE: CALLED!');
-
 		// Get it from iterator which holds the pointer instance. If false is returned
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-BINARY-FILE: CALLED!');
 		$fileSize = $this->size();
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('fileSize=%s', $fileSize));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: fileSize=%s', $fileSize));
 
 		/*
 		 * The returned file size should not be false or NULL as this means
@@ -533,7 +550,7 @@ abstract class BaseBinaryFile extends BaseAbstractFile {
 		$isInitialized = ($fileSize > 0);
 
 		// Return result
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('isInitialized=%d - EXIT!', intval($isInitialized)));
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: isInitialized=%d - EXIT!', intval($isInitialized)));
 		return $isInitialized;
 	}
 
@@ -543,9 +560,8 @@ abstract class BaseBinaryFile extends BaseAbstractFile {
 	 * @return	void
 	 */
 	public function createFileHeader () {
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-BINARY-FILE: CALLED!');
-
 		// The file's header should not be initialized here
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-BINARY-FILE: CALLED!');
 		assert(!$this->isFileHeaderInitialized());
 
 		// Simple flush file header which will create it.
@@ -554,6 +570,7 @@ abstract class BaseBinaryFile extends BaseAbstractFile {
 		// Rewind seek position (to beginning of file) and update/flush file header
 		$this->rewindUpdateSeekPosition();
 
+		// Trace message
 		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-BINARY-FILE: EXIT!');
 	}
 
@@ -562,30 +579,32 @@ abstract class BaseBinaryFile extends BaseAbstractFile {
 	 *
 	 * @param	$type	Type of the file
 	 * @return	void
+	 * @throws	InvalidArgumentException	If a parameter is empty
 	 */
 	public function preAllocateFile (string $type) {
 		// Is it enabled?
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-BINARY-FILE: CALLED!');
-		if (FrameworkBootstrap::getConfigurationInstance()->getConfigEntry($type . '_pre_allocate_enabled') != 'Y') {
-			// Not enabled
-			self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('Not pre-allocating file.'));
-
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: type=%s - CALLED!', $type));
+		if (empty($type)) {
+			// Empty type
+			throw new InvalidArgumentException('Parameter "type" is empty');
+		} elseif (FrameworkBootstrap::getConfigurationInstance()->getConfigEntry($type . '_pre_allocate_enabled') != 'Y') {
 			// Don't continue here.
+			self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: Not pre-allocating file.'));
 			return;
 		}
 
 		// Message to user
-		self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('Pre-allocating file ...'));
+		self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-BINARY-FILE: Pre-allocating file ...');
 
 		// Calculate minimum length for one entry
 		$minLengthEntry = $this->getBlockInstance()->calculateMinimumBlockLength();
 
 		// Calulcate seek position
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('minLengthEntry=%s', $minLengthEntry));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: minLengthEntry=%s', $minLengthEntry));
 		$seekPosition = $minLengthEntry * FrameworkBootstrap::getConfigurationInstance()->getConfigEntry($type . '_pre_allocate_count');
 
 		// Now simply write a NUL there. This will pre-allocate the file.
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('seekPosition=%s', $seekPosition));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: seekPosition=%d', $seekPosition));
 		$this->writeData($seekPosition, chr(0));
 
 		// Rewind seek position (to beginning of file) and update/flush file header
@@ -623,7 +642,7 @@ abstract class BaseBinaryFile extends BaseAbstractFile {
 	 * @param	$bytes	Amount of bytes to read
 	 * @return	$data	Data read from file
 	 */
-	public function read (int $bytes = NULL) {
+	public function read (int $bytes = 0) {
 		// Call pointer instance
 		return $this->getPointerInstance()->read($bytes);
 	}
diff --git a/framework/main/classes/file_directories/binary/index/class_IndexFile.php b/framework/main/classes/file_directories/binary/index/class_IndexFile.php
index 6bcf23bb..c485275f 100644
--- a/framework/main/classes/file_directories/binary/index/class_IndexFile.php
+++ b/framework/main/classes/file_directories/binary/index/class_IndexFile.php
@@ -52,7 +52,7 @@ class IndexFile extends BaseBinaryFile implements Block {
 	 */
 	public final static function createIndexFile (SplFileInfo $fileInfoInstance, Block $blockInstance) {
 		// Get a new instance
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: fileInfoInstance=%s,blockInstance=%s - CALLED!', $fileInfoInstance, $blockInstance->__toString()));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: fileInfoInstance[%s]=%s,blockInstance=%s - CALLED!', get_class($fileInfoInstance), $fileInfoInstance, $blockInstance->__toString()));
 		$fileInstance = new IndexFile();
 
 		// Set block instance here for callbacks
diff --git a/framework/main/classes/file_directories/class_BaseAbstractFile.php b/framework/main/classes/file_directories/class_BaseAbstractFile.php
index 171ad3b7..f72d7753 100644
--- a/framework/main/classes/file_directories/class_BaseAbstractFile.php
+++ b/framework/main/classes/file_directories/class_BaseAbstractFile.php
@@ -150,6 +150,14 @@ abstract class BaseAbstractFile extends BaseFrameworkSystem implements FilePoint
 		return $this->getPointerInstance()->getFileObject();
 	}
 
+	/**
+	 * Getter for file's name
+	 */
+	public final function getFilename () {
+		// Invole file object's method
+		return $this->getFileObject()->getFilename();
+	}
+
 	/**
 	 * Close a file source and set it's instance to null and the file name
 	 * to empty
@@ -157,14 +165,12 @@ abstract class BaseAbstractFile extends BaseFrameworkSystem implements FilePoint
 	 * @return	void
 	 */
 	public function closeFile () {
-		// Debug message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d]: CALLED!', __METHOD__, __LINE__));
-
 		// Close down pointer instance as well by unsetting it
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-ABSTRACT-FILE: CALLED!');
 		$this->unsetPointerInstance();
 
-		// Debug message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d]: EXIT!', __METHOD__, __LINE__));
+		// Trace message
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-ABSTRACT-FILE: EXIT!');
 	}
 
 	/**
diff --git a/framework/main/classes/file_directories/class_BaseFileIo.php b/framework/main/classes/file_directories/class_BaseFileIo.php
index 6e95edd0..54ab1dbf 100644
--- a/framework/main/classes/file_directories/class_BaseFileIo.php
+++ b/framework/main/classes/file_directories/class_BaseFileIo.php
@@ -150,7 +150,7 @@ abstract class BaseFileIo extends BaseFrameworkSystem implements FilePointer, Cl
 	 * @param	$whence		Added to offset (default: only use offset to seek to)
 	 * @return	$status		Status of file seek: 0 = success, -1 = failed
 	 */
-	public function seek ($offset, $whence = SEEK_SET) {
+	public function seek (int $offset, int $whence = SEEK_SET) {
 		// Seek to position
 		$status = $this->getFileObject()->fseek($offset, $whence);
 
diff --git a/framework/main/classes/file_directories/input/raw/class_FrameworkRawFileInputPointer.php b/framework/main/classes/file_directories/input/raw/class_FrameworkRawFileInputPointer.php
index 0a8b447e..5e3c658e 100644
--- a/framework/main/classes/file_directories/input/raw/class_FrameworkRawFileInputPointer.php
+++ b/framework/main/classes/file_directories/input/raw/class_FrameworkRawFileInputPointer.php
@@ -125,7 +125,7 @@ class FrameworkRawFileInputPointer extends BaseFileIo implements InputPointer {
 	 * @param	$bytes	Amount of bytes to read
 	 * @return	$data	Data read from file
 	 */
-	public function read (int $bytes = NULL) {
+	public function read (int $bytes = 0) {
 		// Try to read given characters
 		$data = $this->getFileObject()->fread($bytes);
 
diff --git a/framework/main/classes/file_directories/input/text/class_FrameworkTextFileInputPointer.php b/framework/main/classes/file_directories/input/text/class_FrameworkTextFileInputPointer.php
index 642e555f..20e127f2 100644
--- a/framework/main/classes/file_directories/input/text/class_FrameworkTextFileInputPointer.php
+++ b/framework/main/classes/file_directories/input/text/class_FrameworkTextFileInputPointer.php
@@ -120,7 +120,7 @@ class FrameworkTextFileInputPointer extends BaseFileIo implements InputPointer {
 	 * @throws	NullPointerException	If the file pointer instance is not set by setFileObject()
 	 * @throws	InvalidResourceException	If there is no object being set
 	 */
-	public function read (int $bytes = NULL) {
+	public function read (int $bytes = 0) {
 		// Some sanity checks
 		if (is_null($this->getFileObject())) {
 			// Pointer not initialized
@@ -131,7 +131,7 @@ class FrameworkTextFileInputPointer extends BaseFileIo implements InputPointer {
 		}
 
 		// Is $bytes set?
-		if (is_int($bytes)) {
+		if ($bytes > 0) {
 			// Try to read given characters
 			$data = $this->getFileObject()->fread($bytes);
 		} else {
diff --git a/framework/main/classes/file_directories/io/class_FrameworkFileInputOutputPointer.php b/framework/main/classes/file_directories/io/class_FrameworkFileInputOutputPointer.php
index b67025c3..61db8a66 100644
--- a/framework/main/classes/file_directories/io/class_FrameworkFileInputOutputPointer.php
+++ b/framework/main/classes/file_directories/io/class_FrameworkFileInputOutputPointer.php
@@ -13,7 +13,9 @@ use Org\Mxchange\CoreFramework\Generic\UnsupportedOperationException;
 use Org\Mxchange\CoreFramework\Object\BaseFrameworkSystem;
 
 // Import SPL stuff
+use \InvalidArgumentException;
 use \SplFileInfo;
+use \UnexpectedValueException;
 
 /**
  * A class for reading files
@@ -82,7 +84,7 @@ class FrameworkFileInputOutputPointer extends BaseFileIo implements InputOutputP
 		if ((is_null($fileObject)) || ($fileObject === false)) {
 			// Something bad happend
 			throw new FileIoException($fileInstance->getPathname(), self::EXCEPTION_FILE_POINTER_INVALID);
-		} // END - if
+		}
 
 		// Create new instance
 		$pointerInstance = new FrameworkFileInputOutputPointer();
@@ -94,36 +96,14 @@ class FrameworkFileInputOutputPointer extends BaseFileIo implements InputOutputP
 		return $pointerInstance;
 	}
 
-	/**
-	 * Validates file pointer and throws exceptions. This method does not return
-	 * anything (not reliable) as this method checks the file pointer and on
-	 * case of an error it throws an exception. If this method does not throw
-	 * any exceptions, the file pointer seems to be fine.
-	 *
-	 * @return	void
-	 * @throws	NullPointerException	If the file pointer instance
-	 *									is not set by setFileObject()
-	 * @todo Add more checks
-	 */
-	private function validateFilePointer () {
-		if (is_null($this->getFileObject())) {
-			// Pointer not initialized
-			throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
-		} // END - if
-
-		// All fine here
-	}
-
 	/**
 	 * Read 1024 bytes data from a file pointer
 	 *
 	 * @return	mixed	The result of fread()
 	 */
 	public function readFromFile () {
-		// Validate the pointer
-		$this->validateFilePointer();
-
 		// Read data from the file pointer and return it
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-INPUT-OUTPUT-POINTER: CALLED!');
 		return $this->read(1024);
 	}
 
@@ -134,26 +114,52 @@ class FrameworkFileInputOutputPointer extends BaseFileIo implements InputOutputP
 	 * @return	mixed			Number of writes bytes or false on error
 	 */
 	public function writeToFile (string $dataStream) {
-		// Validate the pointer
-		$this->validateFilePointer();
+		// Validate parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: dataStream(%d)=%s - CALLED!', strlen($dataStream), $dataStream));
+		if (empty($dataStream)) {
+			// Empty dataStream
+			throw new InvalidArgumentException('Parameter "dataStream" is empty');
+		}
 
 		// Write data to the file pointer and return written bytes
-		return $this->getFileObject()->fwrite($dataStream, strlen($dataStream));
+		$status = $this->getFileObject()->fwrite($dataStream, strlen($dataStream));
+
+		// Return status
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: status[%s]=%d - EXIT!', gettype($status), $status));
+		return $status;
 	}
 
 	/**
 	 * Writes at given position by seeking to it.
 	 *
 	 * @param	$seekPosition	Seek position in file
-	 * @param	$data			Data to be written
+	 * @param	$dataStream		Data to be written
 	 * @return	mixed			Number of writes bytes or false on error
+	 * @throws	InvalidArgumentException	If a parameter is not valid
 	 */
-	public function writeAtPosition (int $seekPosition, string $data) {
+	public function writeAtPosition (int $seekPosition, string $dataStream) {
+		// Validate parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: seekPosition=%d,dataStream()=%s - CALLED!', $seekPosition, strlen($dataStream), $dataStream));
+		if ($seekPosition < 0) {
+			// Invalid seek position
+			throw new InvalidArgumentException(sprintf('seekPosition=%d is not valid.', $seekPosition));
+		} elseif (empty($dataStream)) {
+			// Empty dataStream
+			throw new InvalidArgumentException('Parameter "dataStream" is empty');
+		}
+
 		// First seek to it
-		$this->seek($seekPosition);
+		if (!$this->seek($seekPosition)) {
+			// Could not seek
+			throw new InvalidArgumentException(sprintf('Could not seek to seekPosition=%d', $seekPosition));
+		}
 
 		// Then write the data at that position
-		return $this->writeToFile($data);
+		$status = $this->writeToFile($dataStream);
+
+		// Return status
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: status[%s]=%d - EXIT!', gettype($status), $status));
+		return $status;
 	}
 
 	/**
@@ -162,10 +168,8 @@ class FrameworkFileInputOutputPointer extends BaseFileIo implements InputOutputP
 	 * @return	$status		Status of this operation
 	 */
 	public function rewind () {
-		// Validate the pointer
-		$this->validateFilePointer();
-
 		// Rewind the pointer
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-INPUT-OUTPUT-POINTER: CALLED!');
 		return $this->getFileObject()->rewind();
 	}
 
@@ -175,13 +179,22 @@ class FrameworkFileInputOutputPointer extends BaseFileIo implements InputOutputP
 	 * @param	$seekPosition	Seek position in file
 	 * @param	$whence			"Seek mode" (see http://de.php.net/fseek)
 	 * @return	$status			Status of this operation
+	 * @throws	InvalidArgumentException	If a parameter is not valid
 	 */
-	public function seek ($seekPosition, $whence = SEEK_SET) {
-		// Validate the pointer
-		$this->validateFilePointer();
+	public function seek (int $seekPosition, int $whence = SEEK_SET) {
+		// Validate parameter
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: seekPosition=%d,whence=%d - CALLED!', $seekPosition, $whence));
+		if ($seekPosition < 0) {
+			// Invalid seek position
+			throw new InvalidArgumentException(sprintf('seekPosition=%d is not valid.', $seekPosition));
+		}
 
 		// Move the file pointer
-		return $this->getFileObject()->fseek($seekPosition, $whence);
+		$status = $this->getFileObject()->fseek($seekPosition, $whence);
+
+		// Return status
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: status[%s]=%d - EXIT!', gettype($status), $status));
+		return $status;
 	}
 
 	/**
@@ -191,6 +204,7 @@ class FrameworkFileInputOutputPointer extends BaseFileIo implements InputOutputP
 	 */
 	public function readLine () {
 		// Read whole line
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-INPUT-OUTPUT-POINTER: CALLED!');
 		return $this->read();
 	}
 
@@ -199,13 +213,18 @@ class FrameworkFileInputOutputPointer extends BaseFileIo implements InputOutputP
 	 *
 	 * @param	$bytes	Amount of bytes to read
 	 * @return	$data	Data read from file
+	 * @throws	InvalidArgumentException	If a parameter is invalid
 	 */
-	public function read (int $bytes = NULL) {
-		// Validate the pointer
-		$this->validateFilePointer();
+	public function read (int $bytes = 0) {
+		// Validatre parameter
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: bytes=%d - CALLED!', $bytes));
+		if ($bytes < 0) {
+			// Bytes cannot be lesser than zero
+			throw new InvalidArgumentException(sprintf('bytes=%d is not valid', $bytes));
+		}
 
 		// Is $bytes set?
-		if (is_int($bytes)) {
+		if ($bytes > 0) {
 			// Try to read given characters
 			$data = $this->getFileObject()->fread($bytes);
 		} else {
@@ -214,6 +233,7 @@ class FrameworkFileInputOutputPointer extends BaseFileIo implements InputOutputP
 		}
 
 		// Then return it
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-INPUT-OUTPUT-POINTER: data[%s]=%s - EXIT!', gettype($data), $data));
 		return $data;
 	}
 
@@ -264,18 +284,21 @@ class FrameworkFileInputOutputPointer extends BaseFileIo implements InputOutputP
 	 * "Getter" for file size
 	 *
 	 * @return	$fileSize	Size of currently loaded file
+	 * @throws	UnexpectedValueException	If $fileData does not contain "size"
 	 */
 	public function getFileSize () {
-		// Check if the pointer is still valid
-		$this->validateFilePointer();
-
 		// Get file's data
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-INPUT-OUTPUT-POINTER: CALLED!');
 		$fileData = $this->getFileObject()->fstat();
 
 		// Make sure the required array key is there
-		assert(isset($fileData['size']));
+		if (!isset($fileData['size'])) {
+			// Not valid array
+			throw new UnexpectedValueException(sprintf('fileData=%s has no element "size"', print_r($fileData, TRUE)));
+		}
 
 		// Return size
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-INPUT-OUTPUT-POINTER: fileData[size]=%d - EXIT!', $fileData['size']);
 		return $fileData['size'];
 	}
 
diff --git a/framework/main/classes/file_directories/io_stream/class_FileIoStream.php b/framework/main/classes/file_directories/io_stream/class_FileIoStream.php
index 1dfc59ce..d547e234 100644
--- a/framework/main/classes/file_directories/io_stream/class_FileIoStream.php
+++ b/framework/main/classes/file_directories/io_stream/class_FileIoStream.php
@@ -289,7 +289,7 @@ class FileIoStream extends BaseFrameworkSystem implements FileInputStreamer, Fil
 	 * @param	$whence		Added to offset (default: only use offset to seek to)
 	 * @return	$status		Status of file seek: 0 = success, -1 = failed
 	 */
-	public function seek ($offset, $whence = SEEK_SET) {
+	public function seek (int $offset, int $whence = SEEK_SET) {
 		$this->partialStub('offset=' . $offset . ',whence=' . $whence);
 	}
 
diff --git a/framework/main/classes/file_directories/text/class_BaseTextFile.php b/framework/main/classes/file_directories/text/class_BaseTextFile.php
index 901b70b3..44e100b5 100644
--- a/framework/main/classes/file_directories/text/class_BaseTextFile.php
+++ b/framework/main/classes/file_directories/text/class_BaseTextFile.php
@@ -60,7 +60,7 @@ abstract class BaseTextFile extends BaseAbstractFile {
 	 * @param	$whence		Added to offset (default: only use offset to seek to)
 	 * @return	$status		Status of file seek: 0 = success, -1 = failed
 	 */
-	public function seek ($offset, $whence = SEEK_SET) {
+	public function seek (int $offset, int $whence = SEEK_SET) {
 		// Not possible in text files
 		self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-TEXT-FILE: offset=' . $offset . ',whence=' . $whence);
 		throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
diff --git a/framework/main/classes/file_directories/text/input/csv/class_CsvInputFile.php b/framework/main/classes/file_directories/text/input/csv/class_CsvInputFile.php
index d4c84ae6..66fe6ed1 100644
--- a/framework/main/classes/file_directories/text/input/csv/class_CsvInputFile.php
+++ b/framework/main/classes/file_directories/text/input/csv/class_CsvInputFile.php
@@ -68,22 +68,16 @@ class CsvInputFile extends BaseInputTextFile implements CsvInputStreamer {
 	 * @return	$lineArray			An indexed array with the read line
 	 */
 	public function readCsvFileLine (string $columnSeparator) {
-		// Debug message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] columnSeparator=%s - CALLED!', __METHOD__, __LINE__, $columnSeparator));
-
 		// Read raw line
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] columnSeparator=%s - CALLED!', __METHOD__, __LINE__, $columnSeparator));
 		$data = $this->getPointerInstance()->readLine();
 
-		// Debug message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] data()=%d', __METHOD__, __LINE__, strlen($data)));
-
 		// Parse data
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] data()=%d', __METHOD__, __LINE__, strlen($data)));
 		$lineArray = $this->parseDataToIndexedArray($data, $columnSeparator);
 
-		// Debug message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] lineArray()=%d - EXIT!', __METHOD__, __LINE__, count($lineArray)));
-
 		// Return it
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] lineArray()=%d - EXIT!', __METHOD__, __LINE__, count($lineArray)));
 		return $lineArray;
 	}
 
@@ -95,10 +89,8 @@ class CsvInputFile extends BaseInputTextFile implements CsvInputStreamer {
 	 * @return	$lineArray			An indexed array with the read line
 	 */
 	private function parseDataToIndexedArray (string $data, string $columnSeparator) {
-		// Debug message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] data()=%d,columnSeparator=%s - CALLED!', __METHOD__, __LINE__, strlen($data), $columnSeparator));
-
 		// Init return array
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] data()=%d,columnSeparator=%s - CALLED!', __METHOD__, __LINE__, strlen($data), $columnSeparator));
 		$lineArray = [];
 
 		// Whether the parser reads a quoted string (which may contain the column separator again)
@@ -112,65 +104,49 @@ class CsvInputFile extends BaseInputTextFile implements CsvInputStreamer {
 			// "Cache" char
 			$char = substr($data, $idx, 1);
 
-			// Debug message
-			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] idx=%s,char=%s ...', __METHOD__, __LINE__, $idx, $char));
-
 			// Is the column separator found and not within quotes?
+			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] idx=%d,char=%s ...', __METHOD__, __LINE__, $idx, $char));
 			if (($isInQuotes === false) && ($char == $columnSeparator)) {
-				// Debug message
-				//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Adding column=%s ...', __METHOD__, __LINE__, $column));
-
 				// Add this line to the array
+				//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Adding column=%s ...', __METHOD__, __LINE__, $column));
 				array_push($lineArray, $column);
 
-				// Debug message
-				//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] line[]=%d - After add!', __METHOD__, __LINE__, count($lineArray)));
-
 				// Clear variable ...
+				//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] line[]=%d - After add!', __METHOD__, __LINE__, count($lineArray)));
 				$column = '';
 
 				// ... and skip it
 				continue;
 			} elseif ($char == chr(34)) {
-				// Debug message
-				//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] column=%s ...', __METHOD__, __LINE__, $column));
-
 				// $column must be empty at this point if we are at starting quote
+				//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] column=%s ...', __METHOD__, __LINE__, $column));
 				assert(($isInQuotes === true) || (empty($column)));
 
 				// Double-quote found, so flip variable
 				$isInQuotes = (!$isInQuotes);
 
-				// Debug message
-				//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] isInQuotes=%d ...', __METHOD__, __LINE__, intval($isInQuotes)));
-
 				// Skip double-quote (escaping of them is not yet supported)
+				//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] isInQuotes=%d ...', __METHOD__, __LINE__, intval($isInQuotes)));
 				continue;
 			}
 
-			// Debug message
-			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Adding char=%s ...', __METHOD__, __LINE__, $idx, $char));
-
 			// Add char to column
+			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Adding char=%s ...', __METHOD__, __LINE__, $idx, $char));
 			$column .= $char;
-		} // END - for
+		}
 
 		// Is there something outstanding?
 		if (!empty($column)) {
-			// Debug message
-			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Adding column=%s ...', __METHOD__, __LINE__, $column));
-
 			// Then don't forget this. :-)
+			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Adding column=%s ...', __METHOD__, __LINE__, $column));
 			array_push($lineArray, $column);
 
 			// Debug message
 			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] line[]=%d - After add!', __METHOD__, __LINE__, count($lineArray)));
-		} // END - if
-
-		// Debug message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] line[]=%d - EXIT!', __METHOD__, __LINE__, count($lineArray)));
+		}
 
 		// Return it
+		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] line[]=%d - EXIT!', __METHOD__, __LINE__, count($lineArray)));
 		return $lineArray;
 	}
 
diff --git a/framework/main/classes/index/class_BaseIndex.php b/framework/main/classes/index/class_BaseIndex.php
index 0e2c415c..6f0c5a14 100644
--- a/framework/main/classes/index/class_BaseIndex.php
+++ b/framework/main/classes/index/class_BaseIndex.php
@@ -175,7 +175,7 @@ abstract class BaseIndex extends BaseFrameworkSystem {
 	 */
 	protected function initIndex (SplFileInfo $fileInfoInstance) {
 		// Get a file i/o pointer instance for index file
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('fileInfoInstance=%s - CALLED!', $fileInfoInstance));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('fileInfoInstance[%s]=%s - CALLED!', get_class($fileInfoInstance), $fileInfoInstance));
 		$fileInstance = ObjectFactory::createObjectByConfiguredName('index_file_class', array($fileInfoInstance, $this));
 
 		// Get iterator instance
diff --git a/framework/main/classes/index/file_stack/class_FileStackIndex.php b/framework/main/classes/index/file_stack/class_FileStackIndex.php
index 952f1afb..1a8783e4 100644
--- a/framework/main/classes/index/file_stack/class_FileStackIndex.php
+++ b/framework/main/classes/index/file_stack/class_FileStackIndex.php
@@ -54,7 +54,7 @@ class FileStackIndex extends BaseIndex implements IndexableStack, Registerable {
 	 */
 	public final static function createFileStackIndex (SplFileInfo $fileInfoInstance) {
 		// Get a new instance
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-STACK-INDEX: fileInfoInstance=%s - CALLED!', $fileInfoInstance));
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-STACK-INDEX: fileInfoInstance[%s]=%s - CALLED!', get_class($fileInfoInstance), $fileInfoInstance));
 		$indexInstance = new FileStackIndex();
 
 		// Initialize index
diff --git a/framework/main/classes/iterator/file/class_FileIterator.php b/framework/main/classes/iterator/file/class_FileIterator.php
index 360996c2..98aae71f 100644
--- a/framework/main/classes/iterator/file/class_FileIterator.php
+++ b/framework/main/classes/iterator/file/class_FileIterator.php
@@ -163,7 +163,7 @@ class FileIterator extends BaseIterator implements SeekableWritableFileIterator
 	 * @param	$bytes	Amount of bytes to read
 	 * @return	$data	Data read from file
 	 */
-	public function read (int $bytes = NULL) {
+	public function read (int $bytes = 0) {
 		// Call block instance
 		return $this->getBlockInstance()->read($bytes);
 	}
diff --git a/framework/main/classes/output/console/class_ConsoleOutput.php b/framework/main/classes/output/console/class_ConsoleOutput.php
index 3debd0f0..9dcae976 100644
--- a/framework/main/classes/output/console/class_ConsoleOutput.php
+++ b/framework/main/classes/output/console/class_ConsoleOutput.php
@@ -118,7 +118,7 @@ class ConsoleOutput extends BaseOutput implements OutputStreamer {
 	 * @return	$status		Status of file seek: 0 = success, -1 = failed
 	 * @throws	UnsupportedOperationException	If this method is called
 	 */
-	public function seek ($offset, $whence = SEEK_SET) {
+	public function seek (int $offset, int $whence = SEEK_SET) {
 		self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('CONSOLE-OUTPUT: offset=' . $offset . ',whence=' . $whence);
 		throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
 	}
diff --git a/framework/main/classes/output/debug/console/class_DebugConsoleOutput.php b/framework/main/classes/output/debug/console/class_DebugConsoleOutput.php
index eeaa8394..7875e001 100644
--- a/framework/main/classes/output/debug/console/class_DebugConsoleOutput.php
+++ b/framework/main/classes/output/debug/console/class_DebugConsoleOutput.php
@@ -124,7 +124,7 @@ class DebugConsoleOutput extends BaseDebugOutput implements Debugger, OutputStre
 	 * @return	$status		Status of file seek: 0 = success, -1 = failed
 	 * @throws	UnsupportedOperationException	If this method is called
 	 */
-	public function seek ($offset, $whence = SEEK_SET) {
+	public function seek (int $offset, int $whence = SEEK_SET) {
 		self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('DEBUG-CONSOLE-OUTPUT: offset=' . $offset . ',whence=' . $whence);
 		throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
 	}
diff --git a/framework/main/classes/output/debug/error/class_DebugErrorLogOutput.php b/framework/main/classes/output/debug/error/class_DebugErrorLogOutput.php
index dea30153..cdbcf57c 100644
--- a/framework/main/classes/output/debug/error/class_DebugErrorLogOutput.php
+++ b/framework/main/classes/output/debug/error/class_DebugErrorLogOutput.php
@@ -122,7 +122,7 @@ class DebugErrorLogOutput extends BaseDebugOutput implements Debugger, OutputStr
 	 * @return	$status		Status of file seek: 0 = success, -1 = failed
 	 * @throws	UnsupportedOperationException	If this method is called
 	 */
-	public function seek ($offset, $whence = SEEK_SET) {
+	public function seek (int $offset, int $whence = SEEK_SET) {
 		self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('DEBUG-ERROR-LOG-OUTPUT: offset=' . $offset . ',whence=' . $whence);
 		throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
 	}
diff --git a/framework/main/classes/output/debug/web/class_DebugWebOutput.php b/framework/main/classes/output/debug/web/class_DebugWebOutput.php
index 6e448d7d..2f87522c 100644
--- a/framework/main/classes/output/debug/web/class_DebugWebOutput.php
+++ b/framework/main/classes/output/debug/web/class_DebugWebOutput.php
@@ -111,7 +111,7 @@ class DebugWebOutput extends BaseDebugOutput implements Debugger, OutputStreamer
 	 * @return	$status		Status of file seek: 0 = success, -1 = failed
 	 * @throws	UnsupportedOperationException	If this method is called
 	 */
-	public function seek ($offset, $whence = SEEK_SET) {
+	public function seek (int $offset, int $whence = SEEK_SET) {
 		self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('DEBUG-WEB-OUTPUT: offset=' . $offset . ',whence=' . $whence);
 		throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
 	}
diff --git a/framework/main/classes/output/web/class_WebOutput.php b/framework/main/classes/output/web/class_WebOutput.php
index d9c8ac69..44e24e01 100644
--- a/framework/main/classes/output/web/class_WebOutput.php
+++ b/framework/main/classes/output/web/class_WebOutput.php
@@ -104,7 +104,7 @@ class WebOutput extends BaseOutput implements OutputStreamer, Registerable {
 	 * @return	$status		Status of file seek: 0 = success, -1 = failed
 	 * @throws	UnsupportedOperationException	If this method is called
 	 */
-	public function seek ($offset, $whence = SEEK_SET) {
+	public function seek (int $offset, int $whence = SEEK_SET) {
 		self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('WEB-OUTPUT: offset=' . $offset . ',whence=' . $whence);
 		throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
 	}
diff --git a/framework/main/classes/stacker/file/class_BaseFileStack.php b/framework/main/classes/stacker/file/class_BaseFileStack.php
index a5a2eaa6..abce939f 100644
--- a/framework/main/classes/stacker/file/class_BaseFileStack.php
+++ b/framework/main/classes/stacker/file/class_BaseFileStack.php
@@ -16,6 +16,7 @@ use Org\Mxchange\CoreFramework\Traits\Iterator\IteratorTrait;
 use Org\Mxchange\CoreFramework\Utils\String\StringUtils;
 
 // Import SPL stuff
+use \InvalidArgumentException;
 use \SplFileInfo;
 use \UnexpectedValueException;
 
@@ -217,15 +218,22 @@ abstract class BaseFileStack extends BaseStacker implements StackableFile {
 	 * @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');
+		}
+
 		// 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);
diff --git a/framework/main/interfaces/io/class_Streamable.php b/framework/main/interfaces/io/class_Streamable.php
index 1e2de933..3fe663d3 100644
--- a/framework/main/interfaces/io/class_Streamable.php
+++ b/framework/main/interfaces/io/class_Streamable.php
@@ -42,7 +42,7 @@ interface Streamable extends FrameworkInterface {
 	 * @param	$whence		Added to offset (default: only use offset to seek to)
 	 * @return	$status		Status of file seek: 0 = success, -1 = failed
 	 */
-	function seek ($offset, $whence = SEEK_SET);
+	function seek (int $offset, int $whence = SEEK_SET);
 
 	/**
 	 * Size of file stack
diff --git a/framework/main/interfaces/io/pointer/class_InputPointer.php b/framework/main/interfaces/io/pointer/class_InputPointer.php
index faa64157..b146de23 100644
--- a/framework/main/interfaces/io/pointer/class_InputPointer.php
+++ b/framework/main/interfaces/io/pointer/class_InputPointer.php
@@ -52,6 +52,6 @@ interface InputPointer extends StreamableInput, FilePointer {
 	 *									is not set by setFileObject()
 	 * @throws	InvalidResourceException	If there is being set
 	 */
-	function read (int $bytes = NULL);
+	function read (int $bytes = 0);
 
 }
diff --git a/framework/main/interfaces/iterator/file/class_SeekableWritableFileIterator.php b/framework/main/interfaces/iterator/file/class_SeekableWritableFileIterator.php
index b93ace41..4a497bf3 100644
--- a/framework/main/interfaces/iterator/file/class_SeekableWritableFileIterator.php
+++ b/framework/main/interfaces/iterator/file/class_SeekableWritableFileIterator.php
@@ -50,7 +50,7 @@ interface SeekableWritableFileIterator extends SeekableIterator {
 	 * @param	$bytes	Amount of bytes to read
 	 * @return	$data	Data read from file
 	 */
-	function read (int $bytes);
+	function read (int $bytes = 0);
 
 	/**
 	 * Analyzes entries in index file. This will count all found (and valid)
diff --git a/framework/main/middleware/io/class_FileIoHandler.php b/framework/main/middleware/io/class_FileIoHandler.php
index d145b3bb..d2a2a432 100644
--- a/framework/main/middleware/io/class_FileIoHandler.php
+++ b/framework/main/middleware/io/class_FileIoHandler.php
@@ -156,7 +156,7 @@ class FileIoHandler extends BaseMiddleware implements IoHandler {
 	 * @param	$whence		Added to offset (default: only use offset to seek to)
 	 * @return	$status		Status of file seek: 0 = success, -1 = failed
 	 */
-	public function seek ($offset, $whence = SEEK_SET) {
+	public function seek (int $offset, int $whence = SEEK_SET) {
 		$this->partialStub('offset=' . $offset . ',whence=' . $whence);
 	}