/**
* Process the raw data from a binary stream
*
* @return void
*/
public function processData(Woops_Tiff_Binary_Stream $stream)
{
// Gets the TIFF byte order
$byteOrder = $stream->read(2);
// Checks the TIFF byte order
if ($byteOrder === 'II') {
// Byte order is little endian
$this->_isBigEndian = false;
} elseif ($byteOrder === 'MM') {
// Byte order is big endian
$this->_isBigEndian = true;
} else {
// Error - Invalid byte order
throw new Woops_Tiff_Header_Exception('Invalid TIFF file signature (' . $byteOrder . ')', Woops_Tiff_Header_Exception::EXCEPTION_BAD_SIGNATURE);
}
// Gets the TIFF signature
$signature = $this->_isBigEndian ? $stream->bigEndianUnsignedShort() : $stream->littleEndianUnsignedShort();
// Checks the TIFF signature
if ($signature !== 0x2a) {
// Error - Invalid TIFF signature
throw new Woops_Tiff_Header_Exception('Invalid TIFF file signature (' . $signature . ')', Woops_Tiff_Header_Exception::EXCEPTION_BAD_SIGNATURE);
}
// Gets the IFD offset
$this->_offset = $this->_isBigEndian ? $stream->bigEndianUnsignedLong() : $stream->littleEndianUnsignedLong();
}
/**
* Process the raw data from a binary stream
*
* @param Woops_Tiff_Binary_Stream The binary stream
* @return void
* @throws Woops_Tiff_Tag_Exception If the value type is invalid
*/
public function processData(Woops_Tiff_Binary_Stream $stream)
{
// Resets the value array
$this->_values = array();
// Gets the value type
$this->_valueType = $this->_header->isBigEndian() ? $stream->bigEndianUnsignedShort() : $stream->littleEndianUnsignedShort();
// Checks the value type
if (!isset(self::$_types[$this->_valueType])) {
// Error - Invalid value type
throw new Woops_Tiff_Tag_Exception('Invalid value type (' . $this->_valueType . ')', Woops_Tiff_Tag_Exception::EXCEPTION_INVALID_VALUE_TYPE);
}
// Gets the number of values
$valueCount = $this->_header->isBigEndian() ? $stream->bigEndianUnsignedLong() : $stream->littleEndianUnsignedLong();
// Number of bytes to read for the value
$readBytes = $valueCount * self::$_types[$this->_valueType];
// Gets the current offset, so we can rewind the stream
$offset = $stream->getOffset();
// Checks if the value can be contained in the tag
if ($readBytes > 4) {
// Gets the value offset
$valueOffset = $this->_header->isBigEndian() ? $stream->bigEndianUnsignedLong() : $stream->littleEndianUnsignedLong();
// Moves to the value offset
$stream->seek($valueOffset, Woops_Tiff_Binary_Stream::SEEK_SET);
// Reads the value(s)
$this->_readValuesFromStream($stream, $valueCount);
// Moves the stream to the end of the value offset
$stream->seek($offset + 4, Woops_Tiff_Binary_Stream::SEEK_SET);
} else {
// Reads the value(s)
$this->_readValuesFromStream($stream, $valueCount);
// Moves the stream to the end of the value
$stream->seek($offset + 4, Woops_Tiff_Binary_Stream::SEEK_SET);
}
}
