101     pub fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), SystemError> {  in read_exact()
102         if self.pos + buf.len() > self.data.len() {  in read_exact()
105         buf.copy_from_slice(&self.data[self.pos..self.pos + buf.len()]);  in read_exact()
106         self.pos += buf.len();  in read_exact()
113     pub fn read_u16_into(&mut self, buf: &mut [u16]) -> Result<(), SystemError> {  in read_u16_into()
114         if self.pos + buf.len() * size_of::<u16>() > self.data.len() * size_of::<u16>() {  in read_u16_into()
118         for i in 0..buf.len() {  in read_u16_into()
119             buf[i] = self.read_u16()?;  in read_u16_into()
216     pub fn write_exact(&mut self, buf: &[u8]) -> Result<(), SystemError> {  in write_exact()
217         if self.pos + buf.len() > self.data.len() {  in write_exact()
221         self.data[self.pos..self.pos + buf.len()].copy_from_slice(&buf[..]);  in write_exact()
222         self.pos += buf.len();  in write_exact()