A fork of parity-wasm with sign-ext feature enabled.
---
# parity-wasm
Low-level WebAssembly format library.
[](https://travis-ci.org/paritytech/parity-wasm)
[](https://crates.io/crates/parity-wasm)
[Documentation](https://docs.rs/parity-wasm)
## Rust WebAssembly format serializing/deserializing
Add to Cargo.toml
```toml
[dependencies]
parity-wasm = "0.42"
```
and then
```rust
let module = parity_wasm::deserialize_file("./res/cases/v1/hello.wasm").unwrap();
assert!(module.code_section().is_some());
let code_section = module.code_section().unwrap(); // Part of the module with functions code
println!("Function count in wasm file: {}", code_section.bodies().len());
```
## Wabt Test suite
`parity-wasm` supports full [wasm testsuite](https://github.com/WebAssembly/testsuite), running asserts that involves deserialization.
To run testsuite:
- checkout with submodules (`git submodule update --init --recursive`)
- run `cargo test --release --workspace`
Decoder can be fuzzed with `cargo-fuzz` using [`wasm-opt`](https://github.com/WebAssembly/binaryen):
- make sure you have all prerequisites to build `binaryen` and `cargo-fuzz` (`cmake` and a C++11 toolchain)
- checkout with submodules (`git submodule update --init --recursive`)
- install `cargo fuzz` subcommand with `cargo install cargo-fuzz`
- set rustup to use a nightly toolchain, because `cargo fuzz` uses a rust compiler plugin: `rustup override set nightly`
- run `cargo fuzz run deserialize`
## `no_std` crates
This crate has a feature, `std`, that is enabled by default. To use this crate
in a `no_std` context, add the following to your `Cargo.toml` (still requires allocator though):
```toml
[dependencies]
parity-wasm = { version = "0.41", default-features = false }
```
## License
`parity-wasm` is primarily distributed under the terms of both the MIT
license and the Apache License (Version 2.0), at your choice.
See LICENSE-APACHE, and LICENSE-MIT for details.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in parity-wasm by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.