mc-varint
Minecraft VarInt and VarLong implemetation in Rust, providing minimum memory usage and maximum performance.
Example
Read a VarInt from a Read
use mc_varint::VarIntRead;
use std::io::Cursor;
fn main() {
// firstly we create a Cursor
let mut cur = Cursor::new(vec![0xff, 0xff, 0xff, 0xff, 0x07]);
// secondly we read from it
let value = cur.read_var_i32().unwrap();
// the value is 2147483647
assert_eq!(value, 2147483647);
}Write a VarInt to a Write
use mc_varint::{VarInt, VarIntWrite};
use std::io::Cursor;
fn main() {
// firstly we create a Cursor and a VarInt
let mut cur = Cursor::new(Vec::with_capacity(5));
// secondly we write the VarInt to the Cursor
cur.write_var_i32(2147483647).unwrap();
// now the value is written to cur.
assert_eq!(cur.into_inner(), vec![0xff, 0xff, 0xff, 0xff, 0x07]);
}Performance
Platform: 3.4GHz Intel Core i5
running 8 tests
test read_i32 ... bench: 5 ns/iter (+/- 1)
test read_i64 ... bench: 4 ns/iter (+/- 1)
test read_u32 ... bench: 4 ns/iter (+/- 1)
test read_u64 ... bench: 4 ns/iter (+/- 0)
test write_i32 ... bench: 4 ns/iter (+/- 0)
test write_i64 ... bench: 4 ns/iter (+/- 0)
test write_u32 ... bench: 4 ns/iter (+/- 0)
test write_u64 ... bench: 4 ns/iter (+/- 0)
test result: ok. 0 passed; 0 failed; 0 ignored; 8 measured; 0 filtered out
