musli/int/
zigzag.rs

1//! Generic [zigzag encoding] for integers.
2//!
3//! [zigzag encoding]: https://en.wikipedia.org/wiki/Variable-length_quantity#Zigzag_encoding
4
5use super::{Signed, Unsigned};
6
7/// Encode an integer into zig-zag encoding.
8#[inline]
9pub fn encode<T>(x: T) -> T::Unsigned
10where
11    T: Signed,
12{
13    (x >> (T::BITS - 1)).unsigned() ^ (x << 1).unsigned()
14}
15
16/// Decode an integer into zig-zag encoding.
17#[inline]
18pub fn decode<T>(x: T) -> T::Signed
19where
20    T: Unsigned,
21{
22    (x >> 1).signed() ^ -(x & T::ONE).signed()
23}