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use std::io::{Read, Result};
pub trait ReadExt {
fn read_u16_be(&mut self) -> Result<u16>;
fn read_u32_be(&mut self) -> Result<u32>;
fn read_u64_be(&mut self) -> Result<u64>;
fn read_u128_be(&mut self) -> Result<u128>;
fn read_cstr(&mut self) -> Result<String>;
}
impl<T: Read> ReadExt for T {
fn read_u16_be(&mut self) -> Result<u16> {
let mut buf = [0; 2];
self.read_exact(&mut buf)?;
Ok(u16::from_be_bytes(buf))
}
fn read_u32_be(&mut self) -> Result<u32> {
let mut buf = [0; 4];
self.read_exact(&mut buf)?;
Ok(u32::from_be_bytes(buf))
}
fn read_u64_be(&mut self) -> Result<u64> {
let mut buf = [0; 8];
self.read_exact(&mut buf)?;
Ok(u64::from_be_bytes(buf))
}
fn read_u128_be(&mut self) -> Result<u128> {
let mut buf = [0; 16];
self.read_exact(&mut buf)?;
Ok(u128::from_be_bytes(buf))
}
fn read_cstr(&mut self) -> Result<String> {
let mut buf = [0; 1];
let mut s = Vec::new();
loop {
self.read_exact(&mut buf)?;
if buf[0] == 0 {
break;
}
s.push(buf[0]);
}
Ok(String::from_utf8_lossy(&s).to_string())
}
}
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