openethereum/src/hash.rs

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Rust
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2015-11-25 19:26:40 +01:00
use rustc_serialize::hex::*;
use error::EthcoreError;
use std::str::FromStr;
macro_rules! impl_hash {
($from: ident, $size: expr) => {
#[derive(PartialEq, Debug)]
struct $from ([u8; $size]);
impl FromStr for $from {
// type Output = $from;
type Err = EthcoreError;
fn from_str(s: &str) -> Result<$from, EthcoreError> {
let a = try!(s.from_hex());
if a.len() != $size { return Err(EthcoreError::BadSize); }
let mut ret = $from([0;$size]);
for i in 0..$size {
ret.0[i] = a[i];
}
Ok(ret)
}
}
}
}
impl_hash!(Hash64, 8);
impl_hash!(Hash128, 16);
impl_hash!(Address, 20);
impl_hash!(Hash256, 32);
//impl_hash!(Hash512, 64);
#[test]
fn it_works() {
assert_eq!(Hash64::from_str("0123456789abcdef").unwrap(), Hash64([0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef]));
}