219     offset: usize,  field
224         Self { buf, offset: 0 }  in new()
228         self.buf[self.offset] = v;  in write_u8()
229         self.offset += 1;  in write_u8()
233         self.buf[self.offset..(self.offset + 2)].copy_from_slice(&v.to_le_bytes());  in write_u16_le()
234         self.offset += 2;  in write_u16_le()
238         self.buf[self.offset..(self.offset + 2)].copy_from_slice(&v.to_be_bytes());  in write_u16_be()
239         self.offset += 2;  in write_u16_be()
243         self.buf[self.offset..(self.offset + 4)].copy_from_slice(&v.to_le_bytes());  in write_u32_le()
244         self.offset += 4;  in write_u32_le()
248         self.buf[self.offset..(self.offset + 4)].copy_from_slice(&v.to_be_bytes());  in write_u32_be()
249         self.offset += 4;  in write_u32_be()