]> git.mxchange.org Git - core.git/blobdiff - inc/classes/main/file_directories/class_BaseFile.php
Splitted 'binary specific' methods/attributes from generic file class and created...
[core.git] / inc / classes / main / file_directories / class_BaseFile.php
index 7c96e34c619138ad5aecc344e8b81a08f98d8059..cf1bc402c828ee242abdd569ca16d3dc2def6204 100644 (file)
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 class BaseFile extends BaseFrameworkSystem {
-       /**
-        * Separator for header data
-        */
-       const SEPARATOR_HEADER_DATA = 0x01;
-
-       /**
-        * Separator header->entries
-        */
-       const SEPARATOR_HEADER_ENTRIES = 0x02;
-
-       /**
-        * Separator hash->name
-        */
-       const SEPARATOR_HASH_NAME = 0x03;
-
-       /**
-        * Separator entry->entry
-        */
-       const SEPARATOR_ENTRIES = 0x04;
-
-       /**
-        * Separator type->position
-        */
-       const SEPARATOR_TYPE_POSITION = 0x05;
-
-       /**
-        * Length of count
-        */
-       const LENGTH_COUNT = 20;
-
-       /**
-        * Length of position
-        */
-       const LENGTH_POSITION = 20;
-
-       /**
-        * Length of name
-        */
-       const LENGTH_NAME = 10;
-
-       /**
-        * Maximum length of entry type
-        */
-       const LENGTH_TYPE = 20;
-
-       //***** Array elements for 'gaps' array *****
-
-       /**
-        * Start of gap
-        */
-       const GAPS_INDEX_START = 'start';
-
-       /**
-        * End of gap
-        */
-       const GAPS_INDEX_END = 'end';
-
        /**
         * Counter for total entries
         */
        private $totalEntries = 0;
 
-       /**
-        * Current seek position
-        */
-       private $seekPosition = 0;
-
-       /**
-        * Size of header
-        */
-       private $headerSize = 0;
-
-       /**
-        * File header
-        */
-       private $header = array();
-
-       /**
-        * Seek positions for gaps ("fragmentation")
-        */
-       private $gaps = array();
-
-       /**
-        * Seek positions for damaged entries (e.g. mismatching hash sum, ...)
-        */
-       private $damagedEntries = array();
-
        /**
         * The current file we are working in
         */
        private $fileName = '';
 
-       /**
-        * Back-buffer
-        */
-       private $backBuffer = '';
-
-       /**
-        * Currently loaded block (will be returned by current())
-        */
-       private $currentBlock = '';
-
        /**
         * Protected constructor
         *
         * @param       $className      Name of the class
-y       * @return      void
+        * @return      void
         */
        protected function __construct ($className) {
                // Call parent constructor
                parent::__construct($className);
-
-               // Init counters and gaps array
-               $this->initCountersGapsArray();
        }
 
        /**
@@ -151,56 +56,6 @@ y    * @return      void
                parent::__destruct();
        }
 
-       /**
-        * Checks whether the abstracted file only contains gaps by counting all
-        * gaps' bytes together and compare it to total length.
-        *
-        * @return      $isGapsOnly             Whether the abstracted file only contains gaps
-        */
-       private function isFileOnlyGaps () {
-               // First/last gap found?
-               /* Only for debugging
-               if (isset($this->gaps[0])) {
-                       // Output first and last gap
-                       self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] this->gaps[0]=%s,this->gaps[%s]=%s', __METHOD__, __LINE__, print_r($this->gaps[0], TRUE), (count($this->gaps) - 1), print_r($this->gaps[count($this->gaps) - 1], TRUE)));
-               } // END - if
-               */
-
-               // Now count every gap
-               $gapsSize = 0;
-               foreach ($this->gaps as $gap) {
-                       // Calculate size of found gap: end-start including both
-                       $gapsSize += ($gap[self::GAPS_INDEX_END] - $gap[self::GAPS_INDEX_START]);
-               } // END - if
-
-               // Debug output
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] gapsSize=%s,this->headerSize=%s', __METHOD__, __LINE__, $gapsSize, $this->getHeaderSize()));
-
-               // Total gap size + header size must be same as file size
-               $isGapsOnly = (($this->getHeaderSize() + $gapsSize) == $this->getFileSize());
-
-               // Return status
-               return $isGapsOnly;
-       }
-
-       /**
-        * 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.
-        *
-        * @return      void
-        */
-       public function initCountersGapsArray () {
-               // Init counter and seek position
-               $this->setCounter(0);
-               $this->setSeekPosition(0);
-
-               // Init arrays
-               $this->gaps = array();
-               $this->damagedEntries = array();
-       }
-
        /**
         * "Getter" for abstracted file size
         *
@@ -242,139 +97,6 @@ y   * @return      void
                $this->totalEntries++;
        }
 
-       /**
-        * Getter for header size
-        *
-        * @return      $totalEntries   Size of file header
-        */
-       public final function getHeaderSize () {
-               // Get it
-               return $this->headerSize;
-       }
-
-       /**
-        * Setter for header size
-        *
-        * @param       $headerSize             Size of file header
-        * @return      void
-        */
-       public final function setHeaderSize ($headerSize) {
-               // Set it
-               $this->headerSize = $headerSize;
-       }
-
-       /**
-        * Getter for header array
-        *
-        * @return      $totalEntries   Size of file header
-        */
-       public final function getHeader () {
-               // Get it
-               return $this->header;
-       }
-
-       /**
-        * Setter for header
-        *
-        * @param       $header         Array for a file header
-        * @return      void
-        */
-       public final function setHeader (array $header) {
-               // Set it
-               $this->header = $header;
-       }
-
-       /**
-        * Getter for seek position
-        *
-        * @return      $seekPosition   Current seek position (stored here in object)
-        */
-       protected final function getSeekPosition () {
-               // Get it
-               return $this->seekPosition;
-       }
-
-       /**
-        * Setter for seek position
-        *
-        * @param       $seekPosition   Current seek position (stored here in object)
-        * @return      void
-        */
-       protected final function setSeekPosition ($seekPosition) {
-               // And set it
-               $this->seekPosition = $seekPosition;
-       }
-
-       /**
-        * Updates seekPosition attribute from file to avoid to much access on file.
-        *
-        * @return      void
-        */
-       public function updateSeekPosition () {
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
-
-               // Get key (= seek position)
-               $seekPosition = $this->key();
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Setting seekPosition=%s', __METHOD__, __LINE__, $seekPosition));
-
-               // And set it here
-               $this->setSeekPosition($seekPosition);
-
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] EXIT!', __METHOD__, __LINE__));
-       }
-
-       /**
-        * Seeks to beginning of file, updates seek position in this object and
-        * flushes the header.
-        *
-        * @return      void
-        */
-       protected function rewindUpdateSeekPosition () {
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
-
-               // flushFileHeader must be callable
-               assert(is_callable(array($this, 'flushFileHeader')));
-
-               // Seek to beginning of file
-               $this->rewind();
-
-               // And update seek position ...
-               $this->updateSeekPosition();
-
-               // ... to write it back into the file
-               $this->flushFileHeader();
-
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] EXIT!!', __METHOD__, __LINE__));
-       }
-
-       /**
-        * Seeks to old position
-        *
-        * @return      void
-        */
-       protected function seekToOldPosition () {
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
-
-               // Seek to currently ("old") saved position
-               $this->seek($this->getSeekPosition());
-
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] EXIT!!', __METHOD__, __LINE__));
-       }
-
-       /**
-        * Checks whether the block separator has been found
-        *
-        * @param       $str            String to look in
-        * @return      $isFound        Whether the block separator has been found
-        */
-       public static function isBlockSeparatorFound ($str) {
-               // Determine it
-               $isFound = (strpos($str, chr(self::SEPARATOR_ENTRIES)) !== FALSE);
-
-               // Return result
-               return $isFound;
-       }
-
        /**
         * Getter for the file pointer
         *
@@ -405,242 +127,6 @@ y  * @return      void
                return $this->fileName;
        }
 
-       /**
-        * Initializes the back-buffer by setting it to an empty string.
-        *
-        * @return      void
-        */
-       private function initBackBuffer () {
-               // Simply call the setter
-               $this->setBackBuffer('');
-       }
-
-       /**
-        * Setter for backBuffer field
-        *
-        * @param       $backBuffer             Characters to "store" in back-buffer
-        * @return      void
-        */
-       private function setBackBuffer ($backBuffer) {
-               // Cast to string (so no arrays or objects)
-               $backBuffer = (string) $backBuffer;
-
-               // ... and set it
-               $this->backBuffer = $backBuffer;
-       }
-
-       /**
-        * Getter for backBuffer field
-        *
-        * @return      $backBuffer             Characters "stored" in back-buffer
-        */
-       private function getBackBuffer () {
-               return $this->backBuffer;
-       }
-
-       /**
-        * Setter for currentBlock field
-        *
-        * @param       $currentBlock           Characters to set a currently loaded block
-        * @return      void
-        */
-       private function setCurrentBlock ($currentBlock) {
-               // Cast to string (so no arrays or objects)
-               $currentBlock = (string) $currentBlock;
-
-               // ... and set it
-               $this->currentBlock = $currentBlock;
-       }
-
-       /**
-        * Gets currently read data
-        *
-        * @return      $current        Currently read data
-        */
-       public function getCurrentBlock () {
-               // Return it
-               return $this->currentBlock;
-       }
-
-       /**
-        * Initializes this file class
-        *
-        * @param       $fileName       Name of this abstract file
-        * @return      void
-        */
-       protected function initFile ($fileName) {
-               // Get a file i/o pointer instance
-               $pointerInstance = ObjectFactory::createObjectByConfiguredName('file_raw_input_output_class', array($fileName));
-
-               // ... and set it here
-               $this->setPointerInstance($pointerInstance);
-       }
-
-       /**
-        * Writes data at given position
-        *
-        * @param       $seekPosition   Seek position
-        * @param       $data                   Data to be written
-        * @param       $flushHeader    Whether to flush the header (default: flush)
-        * @return      void
-        */
-       protected function writeData ($seekPosition, $data, $flushHeader = TRUE) {
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] seekPosition=%s,data()=%s - CALLED!', __METHOD__, __LINE__, $seekPosition, strlen($data)));
-
-               // Write data at given position
-               $this->getPointerInstance()->writeAtPosition($seekPosition, $data);
-
-               // Update seek position
-               $this->updateSeekPosition();
-
-               // Flush the header?
-               if ($flushHeader === TRUE) {
-                       // Flush header
-                       $this->flushFileHeader();
-
-                       // Seek to old position
-                       $this->seekToOldPosition();
-               } // END - if
-
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] EXIT!', __METHOD__, __LINE__));
-       }
-
-       /**
-        * Marks the currently loaded block as empty (with length of the block)
-        *
-        * @param       $length         Length of the block
-        * @return      void
-        */
-       protected function markCurrentBlockAsEmpty ($length) {
-               // Get current seek position
-               $currentPosition = $this->key();
-
-               // Now add it as gap entry
-               array_push($this->gaps, array(
-                       self::GAPS_INDEX_START  => ($currentPosition - $length),
-                       self::GAPS_INDEX_END    => $currentPosition,
-               ));
-       }
-
-       /**
-        * Checks whether the file header is initialized
-        *
-        * @return      $isInitialized  Whether the file header is initialized
-        */
-       public function isFileHeaderInitialized () {
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
-
-               // Default is not initialized
-               $isInitialized = FALSE;
-
-               // Is the file initialized?
-               if ($this->isFileInitialized()) {
-                       // Some bytes has been written, so rewind to start of it.
-                       $rewindStatus = $this->rewind();
-                       //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] rewindStatus=%s', __METHOD__, __LINE__, $rewindStatus));
-
-                       // Is the rewind() call successfull?
-                       if ($rewindStatus != 1) {
-                               // Something bad happened
-                               self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Could not rewind().', __METHOD__, __LINE__));
-                       } // END - if
-
-                       // Read file header
-                       $this->readFileHeader();
-
-                       // The above method does already check the header
-                       $isInitialized = TRUE;
-               } // END - if
-
-               // Return result
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] isInitialized=%d - EXIT!', __METHOD__, __LINE__, intval($isInitialized)));
-               return $isInitialized;
-       }
-
-       /**
-        * Checks whether the assigned file has been initialized
-        *
-        * @return      $isInitialized          Whether the file's size is zero
-        */
-       public function isFileInitialized () {
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
-
-               // Get it from iterator which holds the pointer instance. If FALSE is returned
-               $fileSize = $this->size();
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] fileSize=%s', __METHOD__, __LINE__, $fileSize));
-
-               /*
-                * The returned file size should not be FALSE or NULL as this means
-                * that the pointer class does not work correctly.
-                */
-               assert(is_int($fileSize));
-
-               // Is more than 0 returned?
-               $isInitialized = ($fileSize > 0);
-
-               // Return result
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] isInitialized=%d - EXIT!', __METHOD__, __LINE__, intval($isInitialized)));
-               return $isInitialized;
-       }
-
-       /**
-        * Creates the assigned file
-        *
-        * @return      void
-        */
-       public function createFileHeader () {
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
-
-               // The file's header should not be initialized here
-               assert(!$this->isFileHeaderInitialized());
-
-               // Simple flush file header which will create it.
-               $this->flushFileHeader();
-
-               // Rewind seek position (to beginning of file) and update/flush file header
-               $this->rewindUpdateSeekPosition();
-
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] EXIT!!', __METHOD__, __LINE__));
-       }
-
-       /**
-        * Pre-allocates file (if enabled) with some space for later faster write access.
-        *
-        * @param       $type   Type of the file
-        * @return      void
-        */
-       public function preAllocateFile ($type) {
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
-
-               // Is it enabled?
-               if ($this->getConfigInstance()->getConfigEntry($type . '_pre_allocate_enabled') != 'Y') {
-                       // Not enabled
-                       self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Not pre-allocating file.', __METHOD__, __LINE__));
-
-                       // Don't continue here.
-                       return;
-               } // END - if
-
-               // Message to user
-               self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Pre-allocating file ...', __METHOD__, __LINE__));
-
-               // Calculate minimum length for one entry
-               $minLengthEntry = $this->getBlockInstance()->calculateMinimumBlockLength();
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] minLengthEntry=%s', __METHOD__, __LINE__, $minLengthEntry));
-
-               // Calulcate seek position
-               $seekPosition = $minLengthEntry * $this->getConfigInstance()->getConfigEntry($type . '_pre_allocate_count');
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] seekPosition=%s', __METHOD__, __LINE__, $seekPosition));
-
-               // Now simply write a NUL there. This will pre-allocate the file.
-               $this->writeData($seekPosition, chr(0));
-
-               // Rewind seek position (to beginning of file) and update/flush file header
-               $this->rewindUpdateSeekPosition();
-
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] EXIT!', __METHOD__, __LINE__));
-       }
-
        /**
         * Close a file source and set it's instance to null and the file name
         * to empty
@@ -655,28 +141,6 @@ y   * @return      void
                $this->setFileName('');
        }
 
-       /**
-        * Determines seek position
-        *
-        * @return      $seekPosition   Current seek position
-        */
-       public function determineSeekPosition () {
-               // Call pointer instance
-               return $this->getPointerInstance()->determineSeekPosition();
-       }
-
-       /**
-        * Seek to given offset (default) or other possibilities as fseek() gives.
-        *
-        * @param       $offset         Offset to seek to (or used as "base" for other seeks)
-        * @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) {
-               // Call pointer instance
-               return $this->getPointerInstance()->seek($offset, $whence);
-       }
-
        /**
         * Size of this file
         *
@@ -701,17 +165,6 @@ y   * @return      void
                return $this->getPointerInstance()->readFromFile();
        }
 
-       /**
-        * Reads given amount of bytes from file.
-        *
-        * @param       $bytes  Amount of bytes to read
-        * @return      $data   Data read from file
-        */
-       public function read ($bytes) {
-               // Call pointer instance
-               return $this->getPointerInstance()->read($bytes);
-       }
-
        /**
         * Write data to a file pointer
         *
@@ -727,16 +180,6 @@ y   * @return      void
                return $this->getPointerInstance()->writeToFile($dataStream);
        }
 
-       /**
-        * Rewinds to the beginning of the file
-        *
-        * @return      $status         Status of this operation
-        */
-       public function rewind () {
-               // Call pointer instance
-               return $this->getPointerInstance()->rewind();
-       }
-
        /**
         * Determines whether the EOF has been reached
         *
@@ -746,236 +189,6 @@ y  * @return      void
                // Call pointer instance
                return $this->getPointerInstance()->isEndOfFileReached();
        }
-
-       /**
-        * Analyzes entries in index file. This will count all found (and valid)
-        * entries, mark invalid as damaged and count gaps ("fragmentation"). If
-        * only gaps are found, the file is considered as "virgin" (no entries).
-        *
-        * @return      void
-        */
-       public function analyzeFile () {
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
-
-               // Make sure the file is initialized
-               assert($this->isFileInitialized());
-
-               // Init counters and gaps array
-               $this->initCountersGapsArray();
-
-               // Output message (as this may take some time)
-               self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Analyzing file structure ... (this may take some time)', __METHOD__, __LINE__));
-
-               // First rewind to the begining
-               $this->rewind();
-
-               // Then try to load all entries
-               while ($this->valid()) {
-                       // Go to next entry
-                       $this->next();
-
-                       // Get current entry
-                       $current = $this->getCurrentBlock();
-
-                       /*
-                        * If the block is empty, maybe the whole file is? This could mean
-                        * that the file has been pre-allocated.
-                        */
-                       if (empty($current)) {
-                               // Then skip this part
-                               continue;
-                       } // END - if
-
-                       // Debug message
-                       /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] current()=%s', __METHOD__, __LINE__, strlen($current)));
-               } // END - while
-
-               // If the last read block is empty, check gaps
-               if (empty($current)) {
-                       // Output message
-                       self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Found a total of %s gaps.', __METHOD__, __LINE__, count($this->gaps)));
-
-                       // Check gaps, if the whole file is empty.
-                       if ($this->isFileOnlyGaps()) {
-                               // Only gaps, so don't continue here.
-                               return;
-                       } // END - if
-
-                       /*
-                        * The above call has calculated a total size of all gaps. If the
-                        * percentage of gaps passes a "soft" limit and last
-                        * defragmentation is to far in the past, or if a "hard" limit has
-                        * reached, run defragmentation.
-                        */
-                       if ($this->isDefragmentationNeeded()) {
-                               // Run "defragmentation"
-                               $this->doRunDefragmentation();
-                       } // END - if
-               } // END - if
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] EXIT!', __METHOD__, __LINE__));
-       }
-
-       /**
-        * Advances to next "block" of bytes
-        *
-        * @return      void
-        */
-       public function next () {
-               // Is there nothing to read?
-               if (!$this->valid()) {
-                       // Nothing to read
-                       return;
-               } // END - if
-
-               // Debug message
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d] key()=%s', __FUNCTION__, __LINE__, $this->key()));
-
-               // Make sure the block instance is set
-               assert($this->getBlockInstance() instanceof CalculatableBlock);
-
-               // First calculate minimum block length
-               $length = $this->getBlockInstance()->calculateMinimumBlockLength();
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d] length=%s', __FUNCTION__, __LINE__, $length));
-
-               // Short be more than zero!
-               assert($length > 0);
-
-               // Read possibly back-buffered bytes from previous call of next().
-               $data = $this->getBackBuffer();
-
-               /*
-                * Read until a entry/block separator has been found. The next read
-                * "block" may not fit, so this loop will continue until the EOB or EOF
-                * has been reached whatever comes first.
-                */
-               while ((!$this->isEndOfFileReached()) && (!self::isBlockSeparatorFound($data))) {
-                       // Then read the next possible block
-                       $block = $this->read($length);
-
-                       // Debug message
-                       //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d] block()=%s,length=%s', __FUNCTION__, __LINE__, strlen($block), $length));
-
-                       // Is it all empty?
-                       if (strlen(trim($block)) == 0) {
-                               // Mark this block as empty
-                               $this->markCurrentBlockAsEmpty(strlen($block));
-
-                               // Skip to next block
-                               continue;
-                       } // END - if
-
-                       // At this block then
-                       $data .= $block;
-
-                       // A debug message
-                       //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d] data()=%s', __FUNCTION__, __LINE__, strlen($data)));
-               } // END - while
-
-               // EOF reached?
-               if ($this->isEndOfFileReached()) {
-                       // Set whole data as current read block
-                       //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('Calling setCurrentBlock(' . strlen($data) . ') ...');
-                       $this->setCurrentBlock($data);
-
-                       // Then abort here silently
-                       //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('EOF reached.');
-                       return;
-               } // END - if
-
-               /*
-                * Init back-buffer which is the data that has been found beyond the
-                * separator.
-                */
-               $this->initBackBuffer();
-
-               // Separate data
-               $dataArray = explode(chr(self::SEPARATOR_ENTRIES), $data);
-
-               // This array must contain two elements
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('dataArray=' . print_r($dataArray, TRUE));
-               assert(count($dataArray) == 2);
-
-               // Left part is the actual block, right one the back-buffer data
-               $this->setCurrentBlock($dataArray[0]);
-               $this->setBackBuffer($dataArray[1]);
-       }
-
-       /**
-        * Checks wether the current entry is valid (not at the end of the file).
-        * This method will return TRUE if an emptied (nulled) entry has been found.
-        *
-        * @return      $isValid        Whether the next entry is valid
-        */
-       public function valid () {
-               // Make sure the block instance is set
-               assert($this->getBlockInstance() instanceof Block);
-
-               // First calculate minimum block length
-               $length = $this->getBlockInstance()->calculateMinimumBlockLength();
-
-               // Short be more than zero!
-               assert($length > 0);
-
-               // Get current seek position
-               $seekPosition = $this->key();
-
-               // Then try to read it
-               $data = $this->read($length);
-
-               // If some bytes could be read, all is fine
-               $isValid = ((is_string($data)) && (strlen($data) > 0));
-
-               // Get header size
-               $headerSize = $this->getHeaderSize();
-
-               // Is the seek position at or beyond the header?
-               if ($seekPosition >= $headerSize) {
-                       // Seek back to old position
-                       $this->seek($seekPosition);
-               } else {
-                       // Seek directly behind the header
-                       $this->seek($headerSize);
-               }
-
-               // Return result
-               return $isValid;
-       }
-
-       /**
-        * Gets current seek position ("key").
-        *
-        * @return      $key    Current key in iteration
-        */
-       public function key () {
-               // Call pointer instance
-               return $this->getPointerInstance()->determineSeekPosition();
-       }
-
-       /**
-        * Reads the file header
-        *
-        * @return      void
-        */
-       public function readFileHeader () {
-               // Make sure the block instance is set
-               assert($this->getBlockInstance() instanceof Block);
-
-               // Call block instance
-               $this->getBlockInstance()->readFileHeader();
-       }
-
-       /**
-        * Flushes the file header
-        *
-        * @return      void
-        */
-       public function flushFileHeader () {
-               // Make sure the block instance is set
-               assert($this->getBlockInstance() instanceof Block);
-
-               // Call block instance
-               $this->getBlockInstance()->flushFileHeader();
-       }
 }
 
 // [EOF]