20     tail: usize,  field
34         let mut available = self.head as isize - self.tail as isize;  in available()
70         if self.head <= self.tail {  in grow()
72             n = self.tail - self.head;  in grow()
73             newdata[..n].copy_from_slice(&self.data[self.head..self.tail]);  in grow()
78             newdata[n..n + self.tail].copy_from_slice(&self.data[..self.tail]);  in grow()
79             n += self.tail;  in grow()
82         self.tail = n;  in grow()
89         let mut size = self.tail as isize - self.head as isize;  in size()
109                 tail: 0,  in new()
149         let tail = b.tail;  in write()  localVariable
150         b.data[tail] = (packet.len() >> 8) as u8;  in write()
151         b.tail += 1;  in write()
152         if b.tail >= b.data.len() {  in write()
153             b.tail = 0;  in write()
156         let tail = b.tail;  in write()  localVariable
157         b.data[tail] = packet.len() as u8;  in write()
158         b.tail += 1;  in write()
159         if b.tail >= b.data.len() {  in write()
160             b.tail = 0;  in write()
164         let end = std::cmp::min(b.data.len(), b.tail + packet.len());  in write()
165         let n = end - b.tail;  in write()
166         let tail = b.tail;  in write()  localVariable
167         b.data[tail..end].copy_from_slice(&packet[..n]);  in write()
168         b.tail += n;  in write()
169         if b.tail >= b.data.len() {  in write()
173             b.tail = m;  in write()
196                 if b.head != b.tail {  in read()
231                     if b.head == b.tail {  in read()
235                         b.tail = 0;  in read()