nom 0.1.6

A byte oriented, zero copy, parser combinators library
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pub trait HexDisplay {
      /// Converts the value of `self` to a hex value, returning the owned
      ///     /// string.
  fn to_hex(&self, chunk_size: usize) -> String;
}

static CHARS: &'static[u8] = b"0123456789abcdef";

impl HexDisplay for [u8] {
  #[allow(unused_variables)]
  fn to_hex(&self, chunk_size: usize) -> String {
    let mut v = Vec::with_capacity(self.len() * 3);
    let mut i = 0;
    for chunk in self.chunks(chunk_size) {
      let s = format!("{:08x}", i);
      for &ch in s.as_bytes().iter() {
        v.push(ch);
      }
      v.push('\t' as u8);

      i = i + chunk_size;

      for &byte in chunk {
        v.push(CHARS[(byte >> 4) as usize]);
        v.push(CHARS[(byte & 0xf) as usize]);
        v.push(' ' as u8);
      }
      if chunk_size > chunk.len() {
        for j in 0..(chunk_size - chunk.len()) {
          v.push(' ' as u8);
          v.push(' ' as u8);
          v.push(' ' as u8);
        }
      }
      v.push('\t' as u8);

      for &byte in chunk {
        if (byte >=32 && byte <= 126) || byte >= 128 {
          v.push(byte);
        } else {
          v.push('.' as u8);
        }
      }
      v.push('\n' as u8);
    }

    unsafe {
      String::from_utf8_unchecked(v)
    }
  }
}