zerocopy-derive 0.8.56: zerocopy_derive

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[dependencies]
zerocopy-derive = "=0.8.56"
zerocopy = "=0.8.56"

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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_derive in pkg:cargo/zerocopy-derive@0.8.56
Kind: HOW

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

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:e6628aff3459993cc023456a496f0cac415a99567adcb6b24e96173d6b760a19","contract":["zerocopy_derive FromBytes and IntoBytes derive zero-copy byte parsing and serialization for C-repr structs","zerocopy_derive Unaligned derives 1-byte alignment allowance for types containing only unaligned fields","zerocopy_derive FromZeros derives safe initialization from all-zero byte patterns","zerocopy_derive TryFromBytes derives fallible conversion validating bit validity invariants","zerocopy_derive derives work on tuple structs and unit structs"],"goal":"verify zerocopy_derive in pkg:cargo/zerocopy-derive@0.8.56","kind":"HOW","packages":["pkg:cargo/zerocopy-derive@0.8.56"],"schemaVersion":1,"symbols":["zerocopy_derive"]},"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-derive@0.8.56"],"schemaVersion":1,"subject":"pkg:cargo/zerocopy-derive@0.8.56","symbols":["zerocopy_derive"],"verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify zerocopy_derive in pkg:cargo/zerocopy-derive@0.8.56",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/zerocopy-derive@0.8.56"
  ],
  "symbols": [
    "zerocopy_derive"
  ]
}

//! Clean-room verification sample for zerocopy-derive.

pub use zerocopy_derive::*;

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

// 1. FromBytes and IntoBytes derive zero-copy byte parsing and serialization for C-repr structs
#[derive(FromBytes, IntoBytes, KnownLayout, Immutable, Debug, PartialEq, Eq, Clone, Copy)]
#[repr(C)]
struct Header {
    tag: [u8; 4],
    code: u16,
    flags: u16,
}

// 2. Unaligned derives 1-byte alignment allowance for types containing only unaligned fields
#[derive(FromBytes, IntoBytes, KnownLayout, Immutable, Unaligned, Debug, PartialEq, Eq, Clone, Copy)]
#[repr(C)]
struct Packet {
    id: u8,
    payload: [u8; 7],
}

// 3. FromZeros derives safe initialization from all-zero byte patterns
#[derive(FromZeros, KnownLayout, Immutable, Debug, PartialEq, Eq)]
#[repr(C)]
struct ZeroInit {
    a: u32,
    b: u64,
}

// 4. TryFromBytes derives fallible conversion validating bit validity invariants
#[derive(TryFromBytes, KnownLayout, Immutable, Debug, PartialEq, Eq, Clone, Copy)]
#[repr(u8)]
#[allow(dead_code)]
enum Status {
    Idle = 0,
    Active = 1,
    Finished = 2,
}

// 5. Tuple structs with zerocopy_derive derive macros
#[derive(FromBytes, IntoBytes, KnownLayout, Immutable, Unaligned, Debug, PartialEq, Eq, Clone, Copy)]
#[repr(C)]
struct ColorRgb(u8, u8, u8);

fn main() {
    // 1. FromBytes and IntoBytes
    let h = Header {
        tag: *b"TEST",
        code: 0x1234,
        flags: 0x5678,
    };
    let bytes = h.as_bytes();
    assert_eq!(bytes.len(), 8);
    let parsed = Header::read_from_bytes(bytes).unwrap();
    assert_eq!(parsed, h);

    // 2. Unaligned
    let raw = [42u8, 1, 2, 3, 4, 5, 6, 7];
    let pkt = Packet::read_from_bytes(&raw[..]).unwrap();
    assert_eq!(pkt.id, 42);
    assert_eq!(pkt.payload, [1, 2, 3, 4, 5, 6, 7]);
    assert_eq!(core::mem::align_of::<Packet>(), 1);

    // 3. FromZeros
    let z: ZeroInit = ZeroInit::new_zeroed();
    assert_eq!(z.a, 0);
    assert_eq!(z.b, 0);

    // 4. TryFromBytes
    let valid_status = Status::try_read_from_bytes(&[1u8]).unwrap();
    assert_eq!(valid_status, Status::Active);
    let invalid_status = Status::try_read_from_bytes(&[99u8]);
    assert!(invalid_status.is_err());

    // 5. Tuple struct
    let rgb = ColorRgb(255, 128, 0);
    assert_eq!(rgb.as_bytes(), &[255, 128, 0]);
    let parsed_rgb = ColorRgb::read_from_bytes(&[255, 128, 0]).unwrap();
    assert_eq!(parsed_rgb, rgb);

    println!("All zerocopy_derive contract assertions passed successfully.");
}