varintrs

A Rust implementation of Golang Variable-Length Integers

Notes：

This is a rust implementation of golang variable-length integers. Variable-length integers are usually used in writing database storage, which can compress integer data storage and save disk space.

For example: ```rust use std::io::Cursor; use varintrs::{Binary, ReadBytesVarExt};

let mut rdr = Cursor::new(vec![228, 211, 247, 161, 22]); let (v, x) = rdr.readvu64::(); asserteq!(5976746468, v); assert_eq!(5, x); ```

```rust use std::io::Cursor; use varintrs::{Binary,WriteBytesVarExt};

let mut rdr = Cursor::new(vec![0u8; 7]); rdr.writevu64::(88748464645454).unwrap(); assert!(rdr.getref().eq(&vec![206, 202, 214, 229, 245, 150, 20])); ```