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util.rs
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util.rs
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use std::io;
// A Write computing a digest on the bytes written.
pub struct CrcDigestWrite<'a, 'b, W, S>
where
W: 'a + io::Write,
S: crc::Width,
{
write: &'a mut W, // underlying writer
digest: &'a mut crc::Digest<'b, S>, // hasher
}
impl<'a, 'b, W, S> CrcDigestWrite<'a, 'b, W, S>
where
W: io::Write,
S: crc::Width,
{
pub fn new(write: &'a mut W, digest: &'a mut crc::Digest<'b, S>) -> Self {
Self { write, digest }
}
}
impl<'a, 'b, W> io::Write for CrcDigestWrite<'a, 'b, W, u32>
where
W: io::Write,
{
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
let result = self.write.write(buf)?;
self.digest.update(&buf[..result]);
Ok(result)
}
fn flush(&mut self) -> io::Result<()> {
self.write.flush()
}
}
// A Write counting the bytes written.
pub struct CountWrite<'a, W>
where
W: 'a + io::Write,
{
write: &'a mut W, // underlying writer
count: usize, // number of bytes written
}
impl<'a, W> CountWrite<'a, W>
where
W: io::Write,
{
pub fn new(write: &'a mut W) -> Self {
Self { write, count: 0 }
}
pub fn count(&self) -> usize {
self.count
}
}
impl<'a, W> io::Write for CountWrite<'a, W>
where
W: io::Write,
{
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
let result = self.write.write(buf)?;
self.count += result;
Ok(result)
}
fn flush(&mut self) -> io::Result<()> {
self.write.flush()
}
}