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use crate::error::Error;
use std::io;
use std::io::prelude::{Read, Write};
use std::net::TcpStream;
pub trait Stream {
fn kread(&mut self, buf: &mut [u8]) -> io::Result<usize>;
fn kread_exact(&mut self, buf: &mut [u8]) -> io::Result<()>;
fn kwrite(&mut self, buf: &[u8]) -> io::Result<usize>;
fn kwrite_all(&mut self, buf: &[u8]) -> io::Result<()>;
fn read_full(&mut self, buf_size: usize) -> Result<Vec<u8>, Error>;
fn read_byte(&mut self) -> Result<u8, Error>;
fn read_bool(&mut self) -> Result<bool, Error>;
fn write_byte(&mut self, byte: u8) -> Result<(), Error>;
fn write_bool(&mut self, b: bool) -> Result<(), Error>;
}
impl Stream for TcpStream {
fn kread(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.read(buf)
}
fn kread_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
self.read_exact(buf)
}
fn kwrite(&mut self, buf: &[u8]) -> io::Result<usize> {
self.write(buf)
}
fn kwrite_all(&mut self, buf: &[u8]) -> io::Result<()> {
self.write_all(buf)
}
fn read_full(&mut self, buf_size: usize) -> Result<Vec<u8>, Error> {
let mut data = Vec::new();
loop {
let mut buf = vec![0u8; buf_size];
let length = match self.read(&mut buf) {
Ok(length) => length,
Err(err) => return Error::from(err),
};
match length {
len if len < buf_size => {
buf.truncate(len);
data.append(&mut buf);
break;
}
_ => data.append(&mut buf),
}
}
Ok(data)
}
fn read_byte(&mut self) -> Result<u8, Error> {
let mut buf = vec![0u8; 1];
match self.read(&mut buf) {
Ok(_) => {}
Err(err) => return Error::from(err),
}
match buf.get(0) {
Some(u) => Ok(*u),
None => {
Error::from("unexpected error: can not get first value from vector of length 1")
}
}
}
fn read_bool(&mut self) -> Result<bool, Error> {
let mut buf = vec![0u8; 1];
match self.read(&mut buf) {
Ok(_) => {}
Err(err) => return Error::from(err),
}
match buf.get(0) {
Some(u) => {
if *u == 1u8 {
Ok(true)
} else if *u == 0u8 {
Ok(false)
} else {
Error::from("received byte is neither 1 nor 0")
}
}
None => {
Error::from("unexpected error: can not get first value from vector of length 1")
}
}
}
fn write_byte(&mut self, u: u8) -> Result<(), Error> {
let buf: &[u8] = &[u];
match self.write(buf) {
Ok(_) => Ok(()),
Err(err) => Error::from(err),
}
}
fn write_bool(&mut self, b: bool) -> Result<(), Error> {
let buf: &[u8] = &[if b { 1 } else { 0 }];
match self.write(buf) {
Ok(_) => Ok(()),
Err(err) => Error::from(err),
}
}
}