157     pub fn write_u8(&mut self, value: u8) -> Result<u8, SystemError> {  in write_u8()
162         self.data[self.pos] = value;  in write_u8()
165         return Ok(value);  in write_u8()
169     pub fn write_u16(&mut self, value: u16) -> Result<u16, SystemError> {  in write_u16()
174         self.data[self.pos] = (value & 0xff) as u8;  in write_u16()
176         self.data[self.pos] = ((value >> 8) & 0xff) as u8;  in write_u16()
179         return Ok(value);  in write_u16()
183     pub fn write_u32(&mut self, value: u32) -> Result<u32, SystemError> {  in write_u32()
189             self.data[self.pos] = ((value >> (i * 8)) & 0xff) as u8;  in write_u32()
193         return Ok(value);  in write_u32()
197     pub fn write_u64(&mut self, value: u64) -> Result<u64, SystemError> {  in write_u64()
203             self.data[self.pos] = ((value >> (i * 8)) & 0xff) as u8;  in write_u64()
207         return Ok(value);  in write_u64()