# `leb128`
[ ](https://crates.io/crates/leb128) [](https://travis-ci.org/gimli-rs/leb128) [](https://coveralls.io/github/gimli-rs/leb128?branch=master)
Read and write DWARF's "Little Endian Base 128" (LEB128) variable length integer
encoding.
The implementation is a direct translation of the pseudocode in the DWARF 4
standard's appendix C.
## Install
Either
$ cargo add leb128
or add this to your `Cargo.toml`:
[dependencies]
leb128 = "0.2.1"
## Example
```rust
use leb128;
let mut buf = [0; 1024];
// Write to anything that implements `std::io::Write`.
{
let mut writable = &mut buf[..];
leb128::write::signed(&mut writable, -12345).expect("Should write number");
}
// Read from anything that implements `std::io::Read`.
let mut readable = &buf[..];
let val = leb128::read::signed(&mut readable).expect("Should read number");
assert_eq!(val, -12345);
```
## Documentation
[Documentation](http://gimli-rs.github.io/leb128/leb128/index.html)
## Read-Eval-Print-Loop for LEB128
This crate comes with a `leb128-repl` program that you can use after `cargo
install leb128` or by running `cargo run` in clone of this repository.
```
$ leb128-repl
LEB128 Read-Eval-Print-Loop!
Converts numbers to signed and unsigned LEB128 and displays the results in
base-10, hex, and binary.
> 42
# unsigned LEB128
[42]
[2a]
[00101010]
# signed LEB128
[42]
[2a]
[00101010]
> -42
# unsigned LEB128
error
# signed LEB128
[86]
[56]
[01010110]
> 9001
# unsigned LEB128
[169, 70]
[a9, 46]
[10101001, 01000110]
# signed LEB128
[169, 198, 0]
[a9, c6, 0]
[10101001, 11000110, 00000000]
> -9001
# unsigned LEB128
error
# signed LEB128
[215, 185, 127]
[d7, b9, 7f]
[11010111, 10111001, 01111111]
>
```
## 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.