hex_utils.rs

// This file is Copyright its original authors, visible in version control history.
//
// This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. You may not use this file except in
// accordance with one or both of these licenses.

use std::fmt::Write;

#[cfg(feature = "uniffi")]
pub fn to_vec(hex: &str) -> Option<Vec<u8>> {
	let mut out = Vec::with_capacity(hex.len() / 2);

	let mut b = 0;
	for (idx, c) in hex.as_bytes().iter().enumerate() {
		b <<= 4;
		match *c {
			b'A'..=b'F' => b |= c - b'A' + 10,
			b'a'..=b'f' => b |= c - b'a' + 10,
			b'0'..=b'9' => b |= c - b'0',
			_ => return None,
		}
		if (idx & 1) == 1 {
			out.push(b);
			b = 0;
		}
	}

	Some(out)
}

#[inline]
pub fn to_string(value: &[u8]) -> String {
	let mut res = String::with_capacity(2 * value.len());
	for v in value {
		write!(&mut res, "{:02x}", v).expect("Unable to write");
	}
	res
}