zerocopy 0.8.56: zerocopy::Unaligned

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zerocopy = { version = "=0.8.56", features = ["derive"] }

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Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify zerocopy::Unaligned in pkg:cargo/zerocopy@0.8.56
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/zerocopy@0.8.56
Demonstrate these symbols/APIs:
  - zerocopy::Unaligned

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:dabe4bbae7ce015c59423602e66c9dbf1b2ec78a346f8c63560bd8705b99912c","contract":["zerocopy Unaligned guarantees 1-byte alignment requirement for primitive types and byte arrays","zerocopy Unaligned derives 1-byte alignment for C-repr structs containing only unaligned fields","zerocopy Unaligned allows reading types from arbitrary unaligned byte slice offsets without alignment errors","zerocopy Unaligned derives 1-byte alignment for transparent wrapper structs over unaligned types","zerocopy Unaligned derives 1-byte alignment for fieldless repr(u8) enums"],"goal":"verify zerocopy::Unaligned in pkg:cargo/zerocopy@0.8.56","kind":"HOW","packages":["pkg:cargo/zerocopy@0.8.56"],"schemaVersion":1,"symbols":["zerocopy::Unaligned"]},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","distro":"alpine","ecosystem":"cargo","libc":"musl","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/zerocopy@0.8.56"],"schemaVersion":1,"subject":"pkg:cargo/zerocopy@0.8.56","symbols":["zerocopy::Unaligned"],"verifierAdapter":"cargo@1"}

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  "goal": "verify zerocopy::Unaligned in pkg:cargo/zerocopy@0.8.56",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/zerocopy@0.8.56"
  ],
  "symbols": [
    "zerocopy::Unaligned"
  ]
}

//! Clean-room verification sample for zerocopy::Unaligned in pkg:cargo/zerocopy@0.8.56.

pub use zerocopy::Unaligned;

use zerocopy::{FromBytes, Immutable, IntoBytes, KnownLayout, Unaligned};

// 1. Primitive types and byte arrays implement Unaligned with alignment 1
fn assert_unaligned<T: Unaligned>() {
    assert_eq!(core::mem::align_of::<T>(), 1);
}

// 2. Unaligned can be derived for C-repr structs containing only unaligned fields
#[derive(Unaligned, FromBytes, IntoBytes, KnownLayout, Immutable, Debug, PartialEq, Eq, Clone, Copy)]
#[repr(C)]
struct Header {
    magic: u8,
    version: u8,
    flags: [u8; 2],
}

// 3. Unaligned types can be read from unaligned byte offsets without alignment error
#[derive(Unaligned, FromBytes, IntoBytes, KnownLayout, Immutable, Debug, PartialEq, Eq, Clone, Copy)]
#[repr(C)]
struct UnalignedPayload {
    id: u8,
    tag: [u8; 3],
}

// 4. Unaligned can be derived for transparent wrapper structs over unaligned types
#[derive(Unaligned, FromBytes, IntoBytes, KnownLayout, Immutable, Debug, PartialEq, Eq, Clone, Copy)]
#[repr(transparent)]
struct ByteWrapper(u8);

// 5. Unaligned can be derived for fieldless enums with repr(u8)
#[derive(Unaligned, KnownLayout, Immutable, Debug, PartialEq, Eq, Clone, Copy)]
#[repr(u8)]
#[allow(dead_code)]
enum Mode {
    Read = 1,
    Write = 2,
}

fn main() {
    // 1. Primitive types and byte arrays implement Unaligned with alignment 1
    assert_unaligned::<u8>();
    assert_unaligned::<i8>();
    assert_unaligned::<[u8; 4]>();
    assert_unaligned::<[u8; 16]>();

    // 2. Unaligned derive for C-repr struct
    assert_unaligned::<Header>();
    let h = Header {
        magic: 0x7F,
        version: 1,
        flags: [0x10, 0x20],
    };
    let bytes = h.as_bytes();
    let parsed = Header::read_from_bytes(bytes).unwrap();
    assert_eq!(parsed, h);

    // 3. Reading from arbitrary unaligned byte offset succeeds
    let buffer: [u8; 9] = [0xFF, 42, b'A', b'B', b'C', 0, 0, 0, 0];
    let payload = UnalignedPayload::read_from_bytes(&buffer[1..5]).unwrap();
    assert_eq!(payload.id, 42);
    assert_eq!(payload.tag, *b"ABC");
    assert_unaligned::<UnalignedPayload>();

    // 4. Transparent wrapper structs
    assert_unaligned::<ByteWrapper>();
    let wrapped = ByteWrapper::read_from_bytes(&[123u8]).unwrap();
    assert_eq!(wrapped.0, 123);

    // 5. Fieldless repr(u8) enums
    assert_unaligned::<Mode>();

    println!("All zerocopy::Unaligned contract assertions passed successfully.");
}