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use std::{
cmp,
io::{ Read, BufRead, Write, Result }
};
pub struct IoLimiter<T> {
inner: T,
read_left: usize,
write_left: usize
}
impl<T> IoLimiter<T> {
pub const fn new(io: T, read_max: usize, write_max: usize) -> Self {
Self { inner: io, read_left: read_max, write_left: write_max }
}
pub fn into_inner(self) -> T {
self.inner
}
}
impl<T> Read for IoLimiter<T> where T: Read {
fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
let to_read = cmp::min(self.read_left, buf.len());
let read = self.inner.read(&mut buf[..to_read])?;
self.read_left -= read;
Ok(read)
}
}
impl<T> BufRead for IoLimiter<T> where T: BufRead {
fn fill_buf(&mut self) -> Result<&[u8]> {
self.inner.fill_buf()
}
fn consume(&mut self, amt: usize) {
self.inner.consume(amt)
}
}
impl<T> Write for IoLimiter<T> where T: Write {
fn write(&mut self, buf: &[u8]) -> Result<usize> {
let to_write = cmp::min(self.write_left, buf.len());
let written = self.inner.write(&buf[..to_write])?;
self.write_left -= written;
Ok(written)
}
fn flush(&mut self) -> Result<()> {
self.inner.flush()
}
}