lsolesen\pel\PelIfd::safeSetThumbnail PHP Method

PelIfd Class Documentation Datei anzeigen Open project: lsolesen/pel

safeSetThumbnail() private method

It is safe to call this method repeatedly with either the offset or the length set to zero, since it requires both of these arguments to be positive before the thumbnail is extracted. When both parameters are set it will check the length against the available data and adjust as necessary. Only then is the thumbnail data loaded.

private safeSetThumbnail ( lsolesen\pel\PelDataWindow $d, integer $offset, integer $length )
$d	lsolesen\pel\PelDataWindow	the data from which the thumbnail will be extracted.
$offset	integer	the offset into the data.
$length	integer	the length of the thumbnail.

    private function safeSetThumbnail(PelDataWindow $d, $offset, $length)
    {
        /*
         * Load the thumbnail if both the offset and the length is
         * available.
         */
        if ($offset > 0 && $length > 0) {
            /*
             * Some images have a broken length, so we try to carefully
             * check the length before we store the thumbnail.
             */
            if ($offset + $length > $d->getSize()) {
                Pel::maybeThrow(new PelIfdException('Thumbnail length %d bytes ' . 'adjusted to %d bytes.', $length, $d->getSize() - $offset));
                $length = $d->getSize() - $offset;
            }
            /* Now set the thumbnail normally. */
            $this->setThumbnail($d->getClone($offset, $length));
        }
    }

PelIfd

__construct

__toString

addEntry

addSubIfd

getBytes

getEntries

getEntry

getIterator

getName

getNextIfd

getSubIfd