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use std::io::{self, Read, Write, Result};
pub struct Counter<T> {
inner: T,
read_size: usize,
written_size: usize,
}
impl<T> Counter<T> {
pub fn new(inner: T) -> Self {
Counter {
inner: inner,
read_size: 0,
written_size: 0,
}
}
pub fn inner_ref(&self) -> &T {
&self.inner
}
pub fn inner_mut(&mut self) -> &mut T {
&mut self.inner
}
pub fn into_inner(self) -> T {
self.inner
}
pub fn written_size(&self) -> usize {
self.written_size
}
pub fn read_size(&self) -> usize {
self.read_size
}
}
impl Counter<io::Sink> {
pub fn with_sink() -> Self {
Self::new(io::sink())
}
}
impl<T: Read> Read for Counter<T> {
fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
self.inner.read(buf).map(|size| {
self.read_size += size;
size
})
}
}
impl<T: Write> Write for Counter<T> {
fn write(&mut self, buf: &[u8]) -> Result<usize> {
self.inner.write(buf).map(|size| {
self.written_size += size;
size
})
}
fn flush(&mut self) -> Result<()> {
self.inner.flush()
}
}