vu64 0.1.2

variable length encode/decode for a 64-bits integer
Documentation

vu64

The variable length integer encoding of u64. This is a simple and fast encoder/decoder.

format pattern

Prefix Precision Total Bytes
0xxxxxxx 7 bits 1 byte
10xxxxxx 14 bits 2 bytes
110xxxxx 21 bits 3 bytes
1110xxxx 28 bits 4 bytes
11110xxx 35 bits 5 bytes
111110xx 42 bits 6 bytes
1111110x 49 bits 7 bytes
11111110 56 bits 8 bytes
11111111 64 bits 9 bytes

This format is a like vint64, but 0x00 is represented by 0x00.

Examples

Encode

use vu64::encode;

assert_eq!(encode(0x0f0f).as_ref(), &[0x8F, 0x3c]);

Decode

use vu64::decode;

let slice = [0x8F, 0x3c].as_ref();
assert_eq!(decode(slice).unwrap(), 0x0f0f);

Encode and decode

use vu64::{encode, decode};

let val = 1234;
assert_eq!(decode(encode(val).as_ref()).unwrap(), val);

Changelogs

This crate's changelog here.

References

License

This project is licensed under either of

at your option.