pinapod 0.4.2

Zero-copy pod types with derive macros. Alignment-1 representations for zero-overhead data access.
Documentation 
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#![allow(
	unsafe_code,
	unused_qualifications,
	missing_docs,
	reason = "the derive macro emits audited zero-copy code, upstream layout assertions \
	          intentionally spell out trait paths, and these test fixtures are not a published \
	          surface"
)]

use pinapod::PinaPod;
use pinapod::pod::*;

#[allow(dead_code)]
#[derive(PinaPod)]
struct Simple {
	pub value: u64,
	pub flag: bool,
}

#[test]
fn fixed_size() {
	assert_eq!(Simple::SIZE, 8 + 1);
}

#[test]
fn fixed_alignment() {
	assert_eq!(
		core::mem::align_of::<<Simple as pinapod::PinaPodFixed>::Zc>(),
		1
	);
}

#[test]
fn fixed_read() {
	let mut buf = [0u8; 9];
	buf[0..8].copy_from_slice(&42u64.to_le_bytes());
	buf[8] = 1;
	let zc = Simple::read_exact(&buf).unwrap();
	assert_eq!(zc.value.get(), 42);
	assert!(zc.flag.get());
}

#[test]
fn fixed_write() {
	let mut buf = [0u8; 9];
	let zc = Simple::read_exact_mut(&mut buf).unwrap();
	zc.value = 100.into();
	zc.flag = true.into();
	assert_eq!(buf[0..8], 100u64.to_le_bytes());
	assert_eq!(buf[8], 1);
}

#[test]
fn fixed_validate_bad_bool() {
	let mut buf = [0u8; 9];
	buf[8] = 2;
	assert!(Simple::read_exact(&buf).is_err());
}

#[test]
fn fixed_buffer_too_small() {
	let buf = [0u8; 4];
	assert!(Simple::read_exact(&buf).is_err());
}

#[allow(dead_code)]
#[derive(PinaPod)]
struct WithCollections {
	pub authority: [u8; 32],
	pub name: pinapod::String<32>,
	pub scores: pinapod::Vec<u8, 10>,
	pub active: bool,
	pub maybe: Option<u64>,
}

#[allow(dead_code)]
#[derive(PinaPod)]
struct WideOptions {
	pub authority: PodOption<[u8; 32], 4>,
	pub amount: PodOption<PodU64, 4>,
}

#[test]
fn fixed_collections_size() {
	// [u8;32](32) + PodString<32,1>(1+32=33) + PodVec<u8,10,2>(2+10=12) +
	// PodBool(1) + PodOption<PodU64>(1+8=9) = 87
	assert_eq!(WithCollections::SIZE, 87);
}

#[test]
fn fixed_collections_alignment() {
	assert_eq!(
		core::mem::align_of::<<WithCollections as pinapod::PinaPodFixed>::Zc>(),
		1
	);
}

#[test]
fn fixed_pfx4_pod_option_accessors_borrow() {
	let mut buf = vec![0u8; WideOptions::SIZE];
	let authority = [7u8; 32];

	{
		let zc = WideOptions::read_exact_mut(&mut buf).unwrap();
		zc.authority = PodOption::<[u8; 32], 4>::some(authority);
		zc.amount = PodOption::<PodU64, 4>::some(PodU64::from(123));
	}

	let zc = WideOptions::read_exact(&buf).unwrap();
	assert_eq!(zc.authority(), Some(&authority));
	assert_eq!(zc.amount().map(pinapod::pod::PodU64::get), Some(123));
}

#[test]
fn fixed_string_field() {
	let mut buf = [0u8; 87];
	let zc = WithCollections::read_exact_mut(&mut buf).unwrap();
	zc.name.try_set("hello").unwrap();
	assert_eq!(zc.name.as_str(), "hello");
}

#[test]
fn fixed_vec_field() {
	let mut buf = [0u8; 87];
	let zc = WithCollections::read_exact_mut(&mut buf).unwrap();
	zc.scores.try_push(1).unwrap();
	zc.scores.try_push(2).unwrap();
	assert_eq!(zc.scores.as_slice(), &[1, 2]);
}

#[test]
fn fixed_option_field() {
	let mut buf = [0u8; 87];
	let zc = WithCollections::read_exact_mut(&mut buf).unwrap();
	assert!(zc.maybe.is_none());
	zc.maybe.set(Some(PodU64::from(42u64)));
	assert_eq!(zc.maybe.get(), Some(PodU64::from(42u64)));
}

#[test]
fn fixed_zc_is_zc_elem() {
	fn assert_zc_elem<T: pinapod::ZcElem>() {}
	assert_zc_elem::<SimpleZc>();
}