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