Serialize the XMP Packet to the given buffer
@param xmp the XMP Packet
@param buffer the buffer to write the XMP to
@param options options on how to write the XMP. See XMP_SERIAL_*
@param padding number of bytes of padding, useful for modifying
embedded XMP in place.
@return TRUE if success.
Serialize the XMP Packet to the given buffer @param xmp the XMP Packet @param buffer the buffer to write the XMP to @param options options on how to write the XMP. See XMP_SERIAL_* @param padding number of bytes of padding, useful for modifying embedded XMP in place. @return TRUE if success.