code.octet-stream.net Git - m17rt/blob - m17core/src/crc.rs

   1 pub const M17_ALG: crc::Algorithm<u16> = crc::Algorithm {
   2     width: 16,
   3     poly: 0x5935,
   4     init: 0xFFFF,
   5     refin: false,
   6     refout: false,
   7     xorout: 0x0000,
   8     check: 0x772B,
   9     residue: 0x0000,
  10 };
  11
  12 pub fn m17_crc(input: &[u8]) -> u16 {
  13     let crc = crc::Crc::<u16>::new(&M17_ALG);
  14     let mut digest = crc.digest();
  15     digest.update(input);
  16     digest.finalize()
  17 }
  18
  19 #[cfg(test)]
  20 mod tests {
  21     use super::*;
  22
  23     #[test]
  24     fn crc_test_vectors() {
  25         assert_eq!(m17_crc(&[]), 0xFFFF);
  26         assert_eq!(m17_crc("A".as_bytes()), 0x206E);
  27         assert_eq!(m17_crc("123456789".as_bytes()), 0x772B);
  28         let bytes: Vec<u8> = (0x00..=0xFF).collect();
  29         assert_eq!(m17_crc(&bytes), 0x1C31);
  30     }
  31 }