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# Bincode

<img align="right" src="./logo.png" />

[![Build Status](https://travis-ci.org/TyOverby/bincode.svg)](https://travis-ci.org/TyOverby/bincode)
[![](http://meritbadge.herokuapp.com/bincode)](https://crates.io/crates/bincode)

A compact encoder / decoder pair that uses an binary zero-fluff encoding scheme.
The size of the encoded object will be the same or smaller than the size that
the object takes up in memory in a running Rust program.

In addition to exposing two simple funcitons that encode to Vec<u8> and decode
from Vec<u8>, binary-encode exposes a Reader/Writer API that makes it work
perfectly with other stream-based apis such as rust files, network streams,
and the [flate2-rs](https://github.com/alexcrichton/flate2-rs) compression
library.

[Api Documentation](http://tyoverby.github.io/bincode/bincode/)

## Example

^code(./examples/basic.rs)


## Details

The encoding (and thus decoding) proceeds unsurprisingly -- primitive
types are encoded according to the underlying `Writer`, tuples and
structs are encoded by encoding their fields one-by-one, and enums are
encoded by first writing out the tag representing the variant and
then the contents.

However, there are some implementation details to be aware of:

* `isize`/`usize` are encoded as `i64`/`u64`, for portability.
* enums variants are encoded as a `u32` instead that as a `uint`.
  `u32` is enough for all practical uses.
* `str` is encoded as `(u64, &[u8])`, where the `u64` is the number of
  bytes contained in the encoded string.