bin.pony

class BitWriter


  fun _bit_to_bool(bit: U8): Bool =>
    if bit == 0 then false else true end

  fun byte_to_bits(byte': U8): Array[U8] =>
    var bits: Array[U8] = bits.create(8)
    var mask: U8 = 0b00000001
    bits.push(((byte' >> 7) and mask))
    bits.push(((byte' >> 6) and mask))
    bits.push(((byte' >> 5) and mask))
    bits.push(((byte' >> 4) and mask))
    bits.push(((byte' >> 3) and mask))
    bits.push(((byte' >> 2) and mask))
    bits.push(((byte' >> 1) and mask))
    bits.push((byte'        and mask))
    bits

    fun bits_to_byte(bits: Array[U8]): U8 =>
      var res: U8 = 0
      try
        res = (bits.pop())      or
              (bits.pop() << 1) or
              (bits.pop() << 2) or
              (bits.pop() << 3) or
              (bits.pop() << 4) or
              (bits.pop() << 5) or
              (bits.pop() << 6) or
              (bits.pop() << 7)
      end
      res