bigint/uint/
rlp.rs

1// Copyright 2017 ETC Dev Team
2// Copyright 2015-2017 Parity Technologies
3//
4// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
5// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
7// option. This file may not be copied, modified, or distributed
8// except according to those terms.
9
10use super::{U256, U128};
11use rlp::{RlpStream, Encodable, Decodable, DecoderError, UntrustedRlp};
12
13macro_rules! impl_encodable_for_uint {
14	($name: ident, $size: expr) => {
15		impl Encodable for $name {
16			fn rlp_append(&self, s: &mut RlpStream) {
17				let leading_empty_bytes = $size - (self.bits() + 7) / 8;
18				let mut buffer = [0u8; $size];
19				self.to_big_endian(&mut buffer);
20				s.encoder().encode_value(&buffer[leading_empty_bytes..]);
21			}
22		}
23	}
24}
25
26macro_rules! impl_decodable_for_uint {
27	($name: ident, $size: expr) => {
28		impl Decodable for $name {
29			fn decode(rlp: &UntrustedRlp) -> Result<Self, DecoderError> {
30				rlp.decoder().decode_value(|bytes| {
31					if !bytes.is_empty() && bytes[0] == 0 {
32						Err(DecoderError::RlpInvalidIndirection)
33					} else if bytes.len() <= $size {
34						Ok($name::from(bytes))
35					} else {
36						Err(DecoderError::RlpIsTooBig)
37					}
38				})
39			}
40		}
41	}
42}
43
44impl_encodable_for_uint!(U256, 32);
45impl_encodable_for_uint!(U128, 16);
46
47impl_decodable_for_uint!(U256, 32);
48impl_decodable_for_uint!(U128, 16);
bigint/uint/rlp.rs

bigint/uint/
rlp.rs
