zerocopy 0.8.57

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# It is not intended for manual editing.
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[dependencies]
zerocopy = { version = "=0.8.57", 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 pkg:cargo/zerocopy@0.8.57
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/zerocopy@0.8.57
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:ce671774270f985398fac1711752c3d1167ea736c26d46aac340e0c9aef2cd96","contract":["zerocopy::Immutable is implemented for core primitive scalar types, arrays, and tuples","zerocopy::Immutable and IntoBytes derive macros derive traits for repr(C) structs","zerocopy::FromBytes read_from_prefix deserializes struct values from byte slices","zerocopy::TryFromBytes try_read_from_bytes parses valid enum discriminants","zerocopy::Unalign wraps unaligned values and preserves byte representation"],"goal":"verify pkg:cargo/zerocopy@0.8.57","kind":"HOW","packages":["pkg:cargo/zerocopy@0.8.57"],"schemaVersion":1},"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@0.8.57"],"schemaVersion":1,"subject":"pkg:cargo/zerocopy@0.8.57","verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify pkg:cargo/zerocopy@0.8.57",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/zerocopy@0.8.57"
  ]
}

//! Clean-room verification sample for zerocopy.

pub use zerocopy::{FromBytes, Immutable, IntoBytes, KnownLayout, TryFromBytes, Unalign};

use zerocopy::{FromBytes, Immutable, IntoBytes, KnownLayout, TryFromBytes, Unalign};

fn assert_immutable<T: ?Sized + Immutable>() {}
fn assert_into_bytes<T: ?Sized + IntoBytes>() {}
fn assert_from_bytes<T: FromBytes>() {}

#[derive(Debug, PartialEq, Eq, Immutable, IntoBytes, FromBytes, KnownLayout)]
#[repr(C)]
struct PacketHeader {
    magic: u32,
    version: u16,
    flags: u16,
}

#[derive(Debug, PartialEq, Eq, Immutable, IntoBytes, KnownLayout)]
#[repr(C)]
struct Payload {
    id: u64,
    tag: [u8; 8],
}

#[derive(Debug, PartialEq, Eq, Immutable, IntoBytes, TryFromBytes, KnownLayout)]
#[repr(u8)]
enum PacketType {
    Data = 1,
    Ack = 2,
    Ping = 3,
}

fn test_traits() {
    assert_immutable::<u32>();
    assert_immutable::<[u8; 16]>();
    assert_immutable::<PacketHeader>();
    assert_immutable::<PacketType>();
    assert_immutable::<Unalign<u32>>();

    assert_into_bytes::<u32>();
    assert_into_bytes::<PacketHeader>();
    assert_into_bytes::<Payload>();

    assert_from_bytes::<u32>();
    assert_from_bytes::<PacketHeader>();
}

fn test_into_bytes_conversion() {
    let header = PacketHeader {
        magic: 0x12345678,
        version: 1,
        flags: 0x0002,
    };
    let bytes = header.as_bytes();
    assert_eq!(bytes.len(), 8);

    let (parsed, _) = PacketHeader::read_from_prefix(bytes).expect("valid header bytes");
    assert_eq!(parsed, header);
}

fn test_enum_try_from_bytes() {
    let p1 = PacketType::Data;
    let p2 = PacketType::Ack;
    let p3 = PacketType::Ping;
    assert_eq!(p1 as u8, 1);
    assert_eq!(p2 as u8, 2);
    assert_eq!(p3 as u8, 3);

    let val = PacketType::try_read_from_bytes(&[1u8]).expect("valid packet type 1");
    assert_eq!(val, PacketType::Data);
}

fn test_unalign() {
    let unaligned = Unalign::new(0xdeadbeef_u32);
    assert_eq!(unaligned.get(), 0xdeadbeef_u32);
    assert_eq!(unaligned.as_bytes(), &0xdeadbeef_u32.to_ne_bytes());
}

fn main() {
    test_traits();
    test_into_bytes_conversion();
    test_enum_try_from_bytes();
    test_unalign();
    println!("zerocopy contract passed");
}