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use std::io::{Read, Result, Seek};
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Endianness {
Big,
Little,
}
pub trait ReadExt {
fn read_u8(&mut self) -> Result<u8>;
fn read_u16(&mut self, e: Endianness) -> Result<u16>;
fn read_u16_le(&mut self) -> Result<u16>;
fn read_u16_be(&mut self) -> Result<u16>;
fn read_i16(&mut self, e: Endianness) -> Result<i16>;
fn read_i16_be(&mut self) -> Result<i16>;
fn read_i16_le(&mut self) -> Result<i16>;
fn read_i32(&mut self, e: Endianness) -> Result<i32>;
fn read_i32_be(&mut self) -> Result<i32>;
fn read_i32_le(&mut self) -> Result<i32>;
fn read_u32(&mut self, e: Endianness) -> Result<u32>;
fn read_u32_be(&mut self) -> Result<u32>;
fn read_u32_le(&mut self) -> Result<u32>;
fn read_u64(&mut self, e: Endianness) -> Result<u64>;
fn read_u64_be(&mut self) -> Result<u64>;
fn read_u64_le(&mut self) -> Result<u64>;
fn read_i64(&mut self, e: Endianness) -> Result<i64>;
fn read_i64_be(&mut self) -> Result<i64>;
fn read_i64_le(&mut self) -> Result<i64>;
fn read_u128_be(&mut self) -> Result<u128>;
fn read_cstr(&mut self) -> Result<String>;
}
impl<T: Read> ReadExt for T {
fn read_u8(&mut self) -> Result<u8> {
let mut buf = [0; 1];
self.read_exact(&mut buf)?;
Ok(buf[0])
}
fn read_u16(&mut self, e: Endianness) -> Result<u16> {
match e {
Endianness::Big => self.read_u16_be(),
Endianness::Little => self.read_u16_le(),
}
}
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_u16_le(&mut self) -> Result<u16> {
let mut buf = [0; 2];
self.read_exact(&mut buf)?;
Ok(u16::from_le_bytes(buf))
}
fn read_i16(&mut self, e: Endianness) -> Result<i16> {
match e {
Endianness::Big => self.read_i16_be(),
Endianness::Little => self.read_i16_le(),
}
}
fn read_i16_be(&mut self) -> Result<i16> {
let mut buf = [0; 2];
self.read_exact(&mut buf)?;
Ok(i16::from_be_bytes(buf))
}
fn read_i16_le(&mut self) -> Result<i16> {
let mut buf = [0; 2];
self.read_exact(&mut buf)?;
Ok(i16::from_le_bytes(buf))
}
fn read_i32(&mut self, e: Endianness) -> Result<i32> {
match e {
Endianness::Big => self.read_i32_be(),
Endianness::Little => self.read_i32_le(),
}
}
fn read_i32_be(&mut self) -> Result<i32> {
let mut buf = [0; 4];
self.read_exact(&mut buf)?;
Ok(i32::from_be_bytes(buf))
}
fn read_i32_le(&mut self) -> Result<i32> {
let mut buf = [0; 4];
self.read_exact(&mut buf)?;
Ok(i32::from_le_bytes(buf))
}
fn read_u32(&mut self, e: Endianness) -> Result<u32> {
match e {
Endianness::Big => self.read_u32_be(),
Endianness::Little => self.read_u32_le(),
}
}
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_u32_le(&mut self) -> Result<u32> {
let mut buf = [0; 4];
self.read_exact(&mut buf)?;
Ok(u32::from_le_bytes(buf))
}
fn read_u64(&mut self, e: Endianness) -> Result<u64> {
match e {
Endianness::Big => self.read_u64_be(),
Endianness::Little => self.read_u64_le(),
}
}
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_u64_le(&mut self) -> Result<u64> {
let mut buf = [0; 8];
self.read_exact(&mut buf)?;
Ok(u64::from_le_bytes(buf))
}
fn read_i64(&mut self, e: Endianness) -> Result<i64> {
match e {
Endianness::Big => self.read_i64_be(),
Endianness::Little => self.read_i64_le(),
}
}
fn read_i64_be(&mut self) -> Result<i64> {
let mut buf = [0; 8];
self.read_exact(&mut buf)?;
Ok(i64::from_be_bytes(buf))
}
fn read_i64_le(&mut self) -> Result<i64> {
let mut buf = [0; 8];
self.read_exact(&mut buf)?;
Ok(i64::from_le_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())
}
}
pub trait AlignExt {
fn align(&mut self, size: u64) -> Result<()>;
}
impl<T: Seek> AlignExt for T {
fn align(&mut self, size: u64) -> Result<()> {
let off = self.stream_position()? % size;
if off != 0 {
self.seek_relative((size - off) as i64)?;
}
Ok(())
}
}
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