src/encoding.rs


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#![forbid(unsafe_code)]


#[derive(Clone, Copy, Debug)]
pub enum UTF8ByteType {
  Single,
  Introducer(u8),
  Continuation,
  Invalid,
}


pub fn get_utf8_byte_type(b: u8) -> UTF8ByteType {
  if b & 0x80 == 0 {
    UTF8ByteType::Single
  } else if b & 0xC0 == 0x80 {
    UTF8ByteType::Continuation
  } else if b & 0xE0 == 0xC0 {
    UTF8ByteType::Introducer(2)
  } else if b & 0xF0 == 0xE0 {
    UTF8ByteType::Introducer(3)
  } else if b & 0xF8 == 0xF0 {
    UTF8ByteType::Introducer(4)
  } else {
    UTF8ByteType::Invalid
  }
}