gecko-dev/third_party/rust/leb128
Ryan Hunt b60da2612e Bug 1612534 - Include vendored files. r=lth
Differential Revision: https://phabricator.services.mozilla.com/D67246

--HG--
extra : moz-landing-system : lando
2020-03-23 16:16:46 +00:00
..
benches Bug 1612534 - Include vendored files. r=lth 2020-03-23 16:16:46 +00:00
src Bug 1612534 - Include vendored files. r=lth 2020-03-23 16:16:46 +00:00
tests Bug 1612534 - Include vendored files. r=lth 2020-03-23 16:16:46 +00:00
.cargo-checksum.json Bug 1612534 - Include vendored files. r=lth 2020-03-23 16:16:46 +00:00
Cargo.toml Bug 1612534 - Include vendored files. r=lth 2020-03-23 16:16:46 +00:00
LICENSE-APACHE Bug 1612534 - Include vendored files. r=lth 2020-03-23 16:16:46 +00:00
LICENSE-MIT Bug 1612534 - Include vendored files. r=lth 2020-03-23 16:16:46 +00:00
README.md Bug 1612534 - Include vendored files. r=lth 2020-03-23 16:16:46 +00:00
format Bug 1612534 - Include vendored files. r=lth 2020-03-23 16:16:46 +00:00

README.md

leb128

Build Status Coverage Status

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

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

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

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.