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use paste::paste;
use std::io::{Read, Result, Write};
/// Read extension to directly read numeric datatypes from a reader.
/// All types are read in little endian byte order.
pub trait ReadExtTypes {
fn read_exact_u8(&mut self) -> Result<u8>;
fn read_exact_i8(&mut self) -> Result<i8>;
fn read_exact_u16(&mut self) -> Result<u16>;
fn read_exact_i16(&mut self) -> Result<i16>;
fn read_exact_u32(&mut self) -> Result<u32>;
fn read_exact_i32(&mut self) -> Result<i32>;
fn read_exact_u64(&mut self) -> Result<u64>;
fn read_exact_i64(&mut self) -> Result<i64>;
}
/// Write extension to directly write numeric datatypes to a writer.
/// All types are written in little endian byte order.
pub trait WriteExtTypes {
fn write_all_u8(&mut self, val: u8) -> Result<()>;
fn write_all_i8(&mut self, val: i8) -> Result<()>;
fn write_all_u16(&mut self, val: u16) -> Result<()>;
fn write_all_i16(&mut self, val: i16) -> Result<()>;
fn write_all_u32(&mut self, val: u32) -> Result<()>;
fn write_all_i32(&mut self, val: i32) -> Result<()>;
fn write_all_u64(&mut self, val: u64) -> Result<()>;
fn write_all_i64(&mut self, val: i64) -> Result<()>;
}
macro_rules! impl_read_ext_types {
($bits:tt) => {
paste! {
fn [< read_exact_ u $bits >](&mut self) -> Result< [< u $bits >] > {
let mut buf = [0; (<[< u $bits >]>::BITS / 8) as usize];
self.read_exact(&mut buf)?;
Ok(<[< u $bits >]>::from_le_bytes(buf))
}
fn [< read_exact_ i $bits >](&mut self) -> Result< [< i $bits >] > {
Ok(self. [< read_exact_ u $bits >] ()? as [< i $bits >])
}
}
};
}
macro_rules! impl_write_ext_types {
($bits:tt) => {
paste! {
fn [< write_all_ u $bits >](&mut self, val: [< u $bits >]) -> Result<()> {
self.write_all(&val.to_le_bytes())?;
Ok(())
}
fn [< write_all_ i $bits >](&mut self, val: [< i $bits >]) -> Result<()> {
self.[< write_all_u $bits >] (val as [< u $bits >])
}
}
};
}
impl<T: Read> ReadExtTypes for T {
impl_read_ext_types!(8);
impl_read_ext_types!(16);
impl_read_ext_types!(32);
impl_read_ext_types!(64);
}
impl<T: Write> WriteExtTypes for T {
impl_write_ext_types!(8);
impl_write_ext_types!(16);
impl_write_ext_types!(32);
impl_write_ext_types!(64);
}
#[cfg(test)]
pub mod test {
use super::{ReadExtTypes, WriteExtTypes};
use paste::paste;
use std::io::Cursor;
macro_rules! impl_test_case_read_ext_types {
($bits:tt) => {
paste! {
let test_val: $bits = <$bits>::MAX;
let mut test_val_read = Cursor::new(test_val.clone().to_le_bytes());
let res_val = test_val_read.[< read_exact_ $bits >]().unwrap();
assert_eq!(test_val, res_val);
let test_val: $bits = <$bits>::MIN;
let mut test_val_read = Cursor::new(test_val.clone().to_le_bytes());
let res_val = test_val_read.[< read_exact_ $bits >]().unwrap();
assert_eq!(test_val, res_val);
let test_val: $bits = 0;
let mut test_val_read = Cursor::new(test_val.clone().to_le_bytes());
let res_val = test_val_read.[< read_exact_ $bits >]().unwrap();
assert_eq!(test_val, res_val);
}
};
}
/// Test if values are written and read correctly
#[test]
pub fn test_read_ext_types() {
impl_test_case_read_ext_types!(u8);
impl_test_case_read_ext_types!(i8);
impl_test_case_read_ext_types!(u16);
impl_test_case_read_ext_types!(i16);
impl_test_case_read_ext_types!(u32);
impl_test_case_read_ext_types!(i32);
impl_test_case_read_ext_types!(u64);
impl_test_case_read_ext_types!(i64);
}
macro_rules! impl_test_case_write_ext_types {
($bits:tt) => {
paste! {
let test_val: $bits = <$bits>::MAX;
let mut write_test = Vec::new();
write_test.[< write_all_ $bits >] (test_val).unwrap();
let res_val = <$bits>::from_le_bytes((&write_test[..].try_into()).unwrap());
assert_eq!(test_val, res_val);
let test_val: $bits = <$bits>::MIN;
let mut write_test = Vec::new();
write_test.[< write_all_ $bits >] (test_val).unwrap();
let res_val = <$bits>::from_le_bytes((&write_test[..].try_into()).unwrap());
assert_eq!(test_val, res_val);
let test_val: $bits = 0;
let mut write_test = Vec::new();
write_test.[< write_all_ $bits >] (test_val).unwrap();
let res_val = <$bits>::from_le_bytes((&write_test[..].try_into()).unwrap());
assert_eq!(test_val, res_val);
}
};
}
#[test]
pub fn test_write_ext_types() {
impl_test_case_write_ext_types!(u8);
impl_test_case_write_ext_types!(i8);
impl_test_case_write_ext_types!(u16);
impl_test_case_write_ext_types!(i16);
impl_test_case_write_ext_types!(u32);
impl_test_case_write_ext_types!(i32);
impl_test_case_write_ext_types!(u64);
impl_test_case_write_ext_types!(i64);
}
}