# Bitcode
[](https://docs.rs/bitcode)
[](https://crates.io/crates/bitcode)
[](https://github.com/SoftbearStudios/bitcode/actions/workflows/build.yml)
A binary encoder/decoder with the following goals:
- 🔥 Blazingly fast
- 🐁 Tiny serialized size
- 💎 Highly compressible by Deflate/LZ4/Zstd
In contrast, these are non-goals:
- Stable format across major versions
- Self describing format
- Compatibility with languages other than Rust
See [rust_serialization_benchmark](https://github.com/djkoloski/rust_serialization_benchmark) for benchmarks.
## Example
```rust
use bitcode::{Encode, Decode};
#[derive(Encode, Decode, PartialEq, Debug)]
struct Foo<'a> {
x: u32,
y: &'a str,
}
let original = Foo {
x: 10,
y: "abc",
};
let encoded: Vec<u8> = bitcode::encode(&original); // No error
let decoded: Foo<'_> = bitcode::decode(&encoded).unwrap();
assert_eq!(original, decoded);
```
## Adding Support for Libraries
See the instructions [here](https://github.com/SoftbearStudios/bitcode/wiki/Adding-library-support)!
## Implementation Details
- Heavily inspired by <https://github.com/That3Percent/tree-buf>
- All instances of each field are grouped together making compression easier
- Uses smaller integers where possible all the way down to 1 bit
- Validation is performed up front on typed vectors before deserialization
- Code is designed to be auto-vectorized by LLVM
## `serde`
A `serde` integration is gated behind the `"serde"` feature flag. Click [here](https://github.com/SoftbearStudios/bitcode/wiki/Serde) to learn more.
## `#![no_std]`
All `std`-only functionality is gated behind the (default) `"std"` feature.
`alloc` is required.
## License
Licensed under either of
* Apache License, Version 2.0
([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
* MIT license
([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
at your option.
## Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.