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https://github.com/mimblewimble/grin.git
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8440aad7ea
* Add get_header_for_output function to chain * add api call to retrieve associated header for a given output * rustfmt
80 lines
2.2 KiB
Rust
80 lines
2.2 KiB
Rust
// Copyright 2018 The Grin Developers
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/// Implements hex-encoding from bytes to string and decoding of strings
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/// to bytes. Given that rustc-serialize is deprecated and serde doesn't
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/// provide easy hex encoding, hex is a bit in limbo right now in Rust-
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/// land. It's simple enough that we can just have our own.
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use std::fmt::Write;
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use std::num;
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/// Encode the provided bytes into a hex string
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pub fn to_hex(bytes: Vec<u8>) -> String {
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let mut s = String::new();
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for byte in bytes {
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write!(&mut s, "{:02x}", byte).expect("Unable to write");
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}
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s
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}
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/// Decode a hex string into bytes.
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pub fn from_hex(hex_str: String) -> Result<Vec<u8>, num::ParseIntError> {
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if hex_str.len() % 2 == 1 {
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// TODO: other way to instantiate a ParseIntError?
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let err = ("QQQ").parse::<u64>();
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if let Err(e) = err {
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return Err(e);
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}
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}
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let hex_trim = if &hex_str[..2] == "0x" {
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hex_str[2..].to_owned()
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} else {
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hex_str.clone()
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};
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split_n(&hex_trim.trim()[..], 2)
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.iter()
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.map(|b| u8::from_str_radix(b, 16))
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.collect::<Result<Vec<u8>, _>>()
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}
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fn split_n(s: &str, n: usize) -> Vec<&str> {
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(0..(s.len() - n + 1) / 2 + 1)
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.map(|i| &s[2 * i..2 * i + n])
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.collect()
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_to_hex() {
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assert_eq!(to_hex(vec![0, 0, 0, 0]), "00000000");
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assert_eq!(to_hex(vec![10, 11, 12, 13]), "0a0b0c0d");
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assert_eq!(to_hex(vec![0, 0, 0, 255]), "000000ff");
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}
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#[test]
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fn test_from_hex() {
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assert_eq!(from_hex("00000000".to_string()).unwrap(), vec![0, 0, 0, 0]);
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assert_eq!(
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from_hex("0a0b0c0d".to_string()).unwrap(),
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vec![10, 11, 12, 13]
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);
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assert_eq!(
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from_hex("000000ff".to_string()).unwrap(),
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vec![0, 0, 0, 255]
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);
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}
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}
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