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use crate::codec::{Error, Decode};
pub(crate) const DECODE_ALL_ERR_MSG: &str = "Input buffer has still data left after decoding!";
pub trait DecodeAll: Sized {
fn decode_all(input: &[u8]) -> Result<Self, Error>;
}
impl<T: Decode> DecodeAll for T {
fn decode_all(input: &[u8]) -> Result<Self, Error> {
let input = &mut &input[..];
let res = T::decode(input)?;
if input.is_empty() {
Ok(res)
} else {
Err(DECODE_ALL_ERR_MSG.into())
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{Encode, Input, Compact, EncodeLike};
macro_rules! test_decode_all {
(
$( $type:ty => $value:expr; )*
) => {
$(
{
let mut encoded = <$type as Encode>::encode(&$value);
<$type>::decode_all(&encoded).expect(
&format!("`{} => {}` decodes all!", stringify!($type), stringify!($value)),
);
encoded.extend(&[1, 2, 3, 4, 5, 6]);
assert_eq!(<$type>::decode_all(&encoded).unwrap_err().what(), DECODE_ALL_ERR_MSG);
}
)*
};
}
#[derive(Debug)]
struct TestStruct {
data: Vec<u32>,
other: u8,
compact: Compact<u128>,
}
impl EncodeLike for TestStruct {}
impl Encode for TestStruct {
fn encode(&self) -> Vec<u8> {
let mut res = Vec::new();
self.data.encode_to(&mut res);
self.other.encode_to(&mut res);
self.compact.encode_to(&mut res);
res
}
}
impl Decode for TestStruct {
fn decode<I: Input>(input: &mut I) -> Result<Self, Error> {
Ok(
Self {
data: Vec::<u32>::decode(input)?,
other: u8::decode(input)?,
compact: Compact::<u128>::decode(input)?,
}
)
}
}
#[test]
fn decode_all_works() {
test_decode_all! {
u8 => 120;
u16 => 30;
u32 => 1;
u64 => 2343545;
u128 => 34358394245459854;
Vec<u8> => vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
Vec<u32> => vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
Compact<u32> => Compact(32445);
Compact<u128> => Compact(34353454453545);
TestStruct => TestStruct { data: vec![1, 2, 4, 5, 6], other: 45, compact: Compact(123234545) };
}
}
}