preflate-rs / fuzz

microsoft/preflate-rs/fuzz/CLAUDE.md

libfuzzer harnesses for fuzzing the core and container APIs. Not published; requires the fuzzing cargo feature. Feeds arbitrary bytes to preflatewholedeflatestream() as a raw DEFLATE stream, then attempts recreatewholedeflatestream() on the result. Verifies no crash or panic. Feeds arbitrary bytes (minimum 1 byte) to preflatewholeintocontainer(), then recreatewholefromcontainer(), and asserts the output matches the original input.

CLAUDE.md36 starsChanged 7 months ago

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# fuzz (preflate-rs-fuzz)

libfuzzer harnesses for fuzzing the core and container APIs. Not published; requires
the `fuzzing` cargo feature.

## Harnesses

### `fuzz_target_1` — core round-trip

Feeds arbitrary bytes to `preflate_whole_deflate_stream()` as a raw DEFLATE stream,
then attempts `recreate_whole_deflate_stream()` on the result. Verifies no crash or panic.

### `fuzz_container` — container round-trip

Feeds arbitrary bytes (minimum 1 byte) to `preflate_whole_into_container()`, then
`recreate_whole_from_container()`, and asserts the output matches the original input.

## Running Fuzz Tests

```bash
# Requires nightly and cargo-fuzz
cargo +nightly fuzz run fuzz_target_1
cargo +nightly fuzz run fuzz_container
```

## Notes

- Edition 2021 (older than the main workspace crates which use 2024).
- `libfuzzer-sys` (0.4) provides the fuzzing harness glue.
- Corpus and artifacts are stored under `fuzz/corpus/` and `fuzz/artifacts/` (gitignored).

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