miniz_oxide 0.8.9: miniz_oxide::deflate::compress_to_vec_zlib

# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4

[[package]]
name = "adler2"
version = "2.0.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa"

[[package]]
name = "miniz_oxide"
version = "0.8.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1fa76a2c86f704bdb222d66965fb3d63269ce38518b83cb0575fca855ebb6316"
dependencies = [
 "adler2",
]

[[package]]
name = "sample-miniz-oxide"
version = "1.0.0"
dependencies = [
 "miniz_oxide",
]

[package]
name = "sample-miniz-oxide"
version = "1.0.0"
edition = "2021"
publish = false

[dependencies]
miniz_oxide = "=0.8.9"

[[bin]]
name = "contract"
path = "test/contract.rs"

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 miniz_oxide::deflate::compress_to_vec_zlib in pkg:cargo/miniz_oxide@0.8.9
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/miniz_oxide@0.8.9
Demonstrate these symbols/APIs:
  - miniz_oxide::deflate::compress_to_vec_zlib

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:sha256:6cc174512d6a230f71b1cfa86fd38572cb7a360dfd9cfaadf24df2d1e8271ce3","contract":["compress_to_vec_zlib compresses input data with a valid zlib header and Adler-32 checksum","compress_to_vec_zlib output round-trips through decompress_to_vec_zlib to restore original bytes","compress_to_vec_zlib supports compression levels from 0 (no compression) to 10 (maximum)","compress_to_vec_zlib handles empty input by producing a valid zlib stream that decompresses to empty","compress_to_vec_zlib achieves significant compression on repetitive data"],"goal":"verify miniz_oxide::deflate::compress_to_vec_zlib in pkg:cargo/miniz_oxide@0.8.9","kind":"HOW","packages":["pkg:cargo/miniz_oxide@0.8.9"],"schemaVersion":1,"symbols":["miniz_oxide::deflate::compress_to_vec_zlib"]},"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/miniz_oxide@0.8.9"],"schemaVersion":1,"subject":"pkg:cargo/miniz_oxide@0.8.9","symbols":["miniz_oxide::deflate::compress_to_vec_zlib"],"verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify miniz_oxide::deflate::compress_to_vec_zlib in pkg:cargo/miniz_oxide@0.8.9",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/miniz_oxide@0.8.9"
  ],
  "symbols": [
    "miniz_oxide::deflate::compress_to_vec_zlib"
  ]
}

//! Clean-room verification sample for miniz_oxide.

pub use miniz_oxide::*;

use miniz_oxide::deflate::compress_to_vec_zlib;
use miniz_oxide::inflate::decompress_to_vec_zlib;

fn main() {
    // 1. compress_to_vec_zlib compresses input data with a valid zlib header and Adler-32 checksum
    let payload = b"Hello, miniz_oxide zlib compression verification payload!";
    let compressed = compress_to_vec_zlib(payload, 6);
    assert!(compressed.len() >= 6, "zlib stream must have header and trailer");
    let cmf = compressed[0];
    let flg = compressed[1];
    assert_eq!(cmf & 0x0F, 8, "CMF method must be deflate (8)");
    assert_eq!(((cmf as u16) * 256 + (flg as u16)) % 31, 0, "FLG checksum must satisfy (CMF*256 + FLG) % 31 == 0");

    // 2. compress_to_vec_zlib output round-trips through decompress_to_vec_zlib to restore original bytes
    let roundtrip = decompress_to_vec_zlib(&compressed).expect("decompression succeeds");
    assert_eq!(roundtrip.as_slice(), payload.as_slice());

    let binary_data: Vec<u8> = (0..=255u8).cycle().take(1024).collect();
    let compressed_bin = compress_to_vec_zlib(&binary_data, 6);
    let roundtrip_bin = decompress_to_vec_zlib(&compressed_bin).expect("decompress binary data");
    assert_eq!(roundtrip_bin, binary_data);

    // 3. compress_to_vec_zlib supports compression levels from 0 (no compression) to 10 (maximum)
    for level in [0, 1, 5, 9, 10] {
        let comp = compress_to_vec_zlib(payload, level);
        let decomp = decompress_to_vec_zlib(&comp).expect("decompression succeeds across levels");
        assert_eq!(decomp.as_slice(), payload.as_slice());
    }

    // 4. compress_to_vec_zlib handles empty input by producing a valid zlib stream that decompresses to empty
    let empty_compressed = compress_to_vec_zlib(&[], 6);
    assert!(!empty_compressed.is_empty(), "zlib empty stream includes header and adler32");
    let decompressed_empty = decompress_to_vec_zlib(&empty_compressed).expect("decompress empty input");
    assert!(decompressed_empty.is_empty());

    // 5. compress_to_vec_zlib achieves significant compression on repetitive data
    let repetitive = vec![b'Z'; 8192];
    let comp_rep = compress_to_vec_zlib(&repetitive, 6);
    assert!(comp_rep.len() < repetitive.len() / 10, "repetitive data should compress substantially");
    let decomp_rep = decompress_to_vec_zlib(&comp_rep).expect("decompress repetitive");
    assert_eq!(decomp_rep, repetitive);

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