use musli::{Decode, Encode};
use crate::tag::{Kind, Tag, MAX_INLINE_LEN};
#[derive(Debug, PartialEq, Encode, Decode)]
struct From<const N: usize> {
#[musli(rename = 0)]
prefix: Option<u32>,
#[musli(rename = 1)]
field: Field<N>,
#[musli(rename = 2)]
suffix: Option<u32>,
}
#[derive(Debug, PartialEq, Encode, Decode)]
struct To {
#[musli(rename = 0)]
prefix: Option<u32>,
#[musli(rename = 2)]
suffix: Option<u32>,
}
#[derive(Debug, PartialEq, Encode, Decode)]
#[musli(packed)]
struct Field<const N: usize> {
value: [u8; N],
}
#[test]
fn pack_max() {
macro_rules! test {
($size:expr, $len:expr) => {
let value = From {
prefix: Some(10),
field: Field { value: [1; $size] },
suffix: Some(20),
};
let bytes = crate::to_vec(&value).unwrap();
let actual: From<$size> = crate::from_slice(&bytes).unwrap();
let to: To = crate::from_slice(&bytes).unwrap();
assert_eq!(value, actual);
assert_eq!(
to,
To {
prefix: Some(10),
suffix: Some(20)
}
);
assert_eq!(Tag::from_byte(bytes[5]), Tag::new(Kind::Prefix, $len));
assert_eq!(bytes.len(), $size + 9);
};
}
test!(0, 0);
test!(23, 23);
test!(MAX_INLINE_LEN, 62);
}
#[test]
fn pow2() {
macro_rules! test_case {
($size:expr, $pow:expr, $pad:expr) => {
let value = From {
prefix: Some(10),
field: Field { value: [1; $size] },
suffix: Some(20),
};
let bytes = crate::to_vec(&value).unwrap();
let actual: From<$size> = crate::from_slice(&bytes).unwrap();
let to: To = crate::from_slice(&bytes).unwrap();
assert_eq!(actual, value);
assert_eq!(
to,
To {
prefix: Some(10),
suffix: Some(20)
}
);
assert_eq!(Tag::from_byte(bytes[5]), Tag::new(Kind::Pack, $pow));
assert_eq!(bytes.len(), $size + $pad);
let start = $size + 6;
assert!(&bytes[start..start + 18].iter().all(|b| *b == 0));
};
}
test_case!(110, 7, 27);
test_case!(200, 8, 65);
}