1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
use Buffer;
use BufferRef;
use ToBufferRef;
use wildly_unsafe;
pub struct BufferRefBuffer<'ref_, 'data: 'ref_, 'size: 'ref_> {
buffer: &'ref_ mut BufferRef<'data, 'size>,
initialized: usize,
}
impl<'r, 'd, 's> BufferRefBuffer<'r, 'd, 's> {
fn new(buffer: &'r mut BufferRef<'d, 's>) -> BufferRefBuffer<'r, 'd, 's> {
BufferRefBuffer {
buffer: buffer,
initialized: 0,
}
}
fn buffer<'a>(&'a mut self) -> BufferRef<'d, 'a> {
let len = *self.buffer.initialized_;
unsafe {
BufferRef::new(wildly_unsafe(&mut self.buffer.buffer[len..]),
&mut self.initialized)
}
}
}
impl<'r, 'd, 's> Drop for BufferRefBuffer<'r, 'd, 's> {
fn drop(&mut self) {
*self.buffer.initialized_ += self.initialized;
}
}
impl<'r, 'd, 's> Buffer<'d> for &'r mut BufferRef<'d, 's> {
type Intermediate = BufferRefBuffer<'r, 'd, 's>;
fn to_to_buffer_ref(self) -> Self::Intermediate {
BufferRefBuffer::new(self)
}
}
impl<'r, 'd, 's> ToBufferRef<'d> for BufferRefBuffer<'r, 'd, 's> {
fn to_buffer_ref<'a>(&'a mut self) -> BufferRef<'d, 'a> {
self.buffer()
}
}
#[cfg(test)]
mod test {
use with_buffer;
#[test]
fn buffer_ref_remaining() {
let a: &mut [u8] = &mut [0; 32];
with_buffer(a, |mut b| {
with_buffer(&mut b, |mut c| {
assert!(c.remaining() == 32);
c.write(&[0]).unwrap();
assert!(c.remaining() == 31);
assert!(c.initialized() == &[0]);
});
assert!(b.remaining() == 31);
with_buffer(&mut b, |mut c| {
assert!(c.remaining() == 31);
c.write(&[1]).unwrap();
assert!(c.remaining() == 30);
assert!(c.initialized() == &[1]);
});
assert!(b.remaining() == 30);
assert!(b.initialized() == &[0, 1]);
})
}
}