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TON (The Open Network) SDK

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ton native crc16 src lib.rs
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native/crc16/src/lib.rs 

use rustler::{Binary, NifResult};



const POLY: i32 = 0x1021;

const MASK: i32 = 0x80;

const FFFF: i32 = 0xffff;



#[rustler::nif]

fn calc<'a>(payload: Binary<'a>) -> NifResult<i32> {

    let mut extended_payload: Vec<u8> = vec![];

    extended_payload.extend_from_slice(payload.as_slice());

    extended_payload.append(&mut vec![0, 0]);



    let mut reg: i32 = 0;

    for payload_byte in extended_payload {

        let mut mask = MASK;



        while mask > 0 {

            reg = reg << 1;



            if ((payload_byte as i32) & mask) > 0 {

                reg = reg + 1;

            }



            mask = mask >> 1;



            if reg > FFFF {

                reg = reg & FFFF;

                reg = reg ^ POLY;

            }

        }

    }



    Ok(reg)

}



rustler::init!("Elixir.Ton.Crc16.Impl", [calc]);