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pub fn to_hex(data: &[u8]) -> String {
data.iter().map(|b| format!("{:02x}", b)).collect::<Vec<String>>().join("")
}
pub fn parse_hex(hex: &str) -> Result<Vec<u8>, ()> {
let mut b = Vec::with_capacity(hex.len() / 2);
let mut modulus = 0;
let mut buf = 0;
for (_, byte) in hex.bytes().enumerate() {
buf <<= 4;
match byte {
b'A'...b'F' => buf |= byte - b'A' + 10,
b'a'...b'f' => buf |= byte - b'a' + 10,
b'0'...b'9' => buf |= byte - b'0',
b' '|b'\r'|b'\n'|b'\t' => {
buf >>= 4;
continue
}
_ => return Err(()),
}
modulus += 1;
if modulus == 2 {
modulus = 0;
b.push(buf);
}
}
match modulus {
0 => Ok(b.into_iter().collect()),
_ => Err(()),
}
}
mod tests {
#[allow(unused_imports)]
use super::*;
#[test]
fn test_to_hex() {
assert_eq!(to_hex(&[0]), "00");
assert_eq!(to_hex(&[1]), "01");
assert_eq!(to_hex(&[15]), "0f");
assert_eq!(to_hex(&[16]), "10");
assert_eq!(to_hex(&[255]), "ff");
assert_eq!(to_hex(&[5,255]), "05ff");
}
#[test]
fn test_parse_hex() {
assert_eq!(parse_hex("00"), Ok(vec![0]));
assert_eq!(parse_hex("01"), Ok(vec![1]));
assert_eq!(parse_hex("0f"), Ok(vec![15]));
assert_eq!(parse_hex("0fff"), Ok(vec![15,255]));
assert_eq!(parse_hex("0F"), Ok(vec![15]));
assert_eq!(parse_hex("01 02\n03\t04"), Ok(vec![1,2,3,4]));
}
}