zerocopy 0.8.56: zerocopy::byteorder::big_endian::U32

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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::byteorder::big_endian::U32 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::byteorder::big_endian::U32

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.

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{
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  "kind": "HOW",
  "packages": [
    "pkg:cargo/zerocopy@0.8.56"
  ],
  "symbols": [
    "zerocopy::byteorder::big_endian::U32"
  ]
}

//! Clean-room verification sample for zerocopy::byteorder::big_endian::U32.

pub use zerocopy::byteorder::big_endian::U32;

use std::mem::align_of;
use zerocopy::byteorder::big_endian::U32;
use zerocopy::{FromBytes, IntoBytes};

fn main() {
    // 1. U32::new constructs a big-endian 32-bit integer and get returns the native value
    let val = U32::new(0x12345678);
    assert_eq!(val.get(), 0x12345678);
    assert_eq!(val.to_bytes(), [0x12, 0x34, 0x56, 0x78]);

    let zero = U32::ZERO;
    assert_eq!(zero.get(), 0);
    assert_eq!(zero.to_bytes(), [0, 0, 0, 0]);

    let max = U32::MAX_VALUE;
    assert_eq!(max.get(), u32::MAX);
    assert_eq!(max.to_bytes(), [0xFF, 0xFF, 0xFF, 0xFF]);

    // 2. U32 has 1-byte alignment and preserves big-endian byte layout in memory
    assert_eq!(align_of::<U32>(), 1);
    let bytes: [u8; 4] = val.into();
    assert_eq!(bytes, [0x12, 0x34, 0x56, 0x78]);

    // 3. U32 from_bytes and to_bytes convert between raw big-endian byte arrays and U32
    let raw = [0x01, 0x02, 0x03, 0x04];
    let from_raw = U32::from_bytes(raw);
    assert_eq!(from_raw.get(), 0x01020304);
    assert_eq!(from_raw.to_bytes(), raw);

    let from_arr: U32 = raw.into();
    assert_eq!(from_arr, from_raw);

    // 4. U32 set updates the stored value in-place with big-endian encoding
    let mut mutable = U32::new(10);
    assert_eq!(mutable.get(), 10);
    mutable.set(0xDEADBEEF);
    assert_eq!(mutable.get(), 0xDEADBEEF);
    assert_eq!(mutable.to_bytes(), [0xDE, 0xAD, 0xBE, 0xEF]);

    // 5. U32 implements FromBytes, IntoBytes, and arithmetic operations
    let stream = [0xAA, 0xBB, 0xCC, 0xDD];
    let parsed = U32::read_from_bytes(&stream[..]).unwrap();
    assert_eq!(parsed.get(), 0xAABBCCDD);
    assert_eq!(parsed.as_bytes(), &[0xAA, 0xBB, 0xCC, 0xDD]);

    let sum = U32::new(100) + U32::new(50);
    assert_eq!(sum.get(), 150);

    let sum_native = U32::new(100) + 25u32;
    assert_eq!(sum_native.get(), 125);

    println!("All zerocopy::byteorder::big_endian::U32 contract assertions passed successfully.");
}