public static int computeRawMessageSetExtensionSize ( final int fieldNumber , final ByteString value ) { return computeTagSize ( WireFormat . MESSAGE_SET_ITEM ) * 2 + computeUInt32Size ( WireFormat . MESSAGE_SET_TYPE_ID , fieldNumber ) + computeBytesSize ( WireFormat . MESSAGE_SET_MESSAGE , value ) ; }
Compute the number of bytes that would be needed to encode an unparsed MessageSet extension field to the stream . For historical reasons the wire format differs from normal fields .