Method: Api::ActionSpatialUnitSelectionPoint#_encode

Defined in:

lib/sc2ai/protocol/spatial_pb.rb

#_encode(buff) ⇒ Object

# File 'lib/sc2ai/protocol/spatial_pb.rb', line 12062

def _encode(buff)
  val = @selection_screen_coord
  if val
    buff << 0x0a

    # Save the buffer size before appending the submessage
    current_len = buff.bytesize

    # Write a single dummy byte to later store encoded length
    buff << 42 # "*"
    val._encode(buff)

    # Calculate the submessage's size
    submessage_size = buff.bytesize - current_len - 1

    # Hope the size fits in one byte
    byte = submessage_size & 0x7F
    submessage_size >>= 7
    byte |= 0x80 if submessage_size > 0
    buff.setbyte(current_len, byte)

    # If the sub message was bigger
    if submessage_size > 0
      current_len += 1

      # compute how much we need to shift
      encoded_int_len = 0
      remaining_size = submessage_size
      while remaining_size != 0
        remaining_size >>= 7
        encoded_int_len += 1
      end

      # Make space in the string with dummy bytes
      buff.bytesplice(current_len, 0, "*********", 0, encoded_int_len)

      # Overwrite the dummy bytes with the encoded length
      while submessage_size != 0
        byte = submessage_size & 0x7F
        submessage_size >>= 7
        byte |= 0x80 if submessage_size > 0
        buff.setbyte(current_len, byte)
        current_len += 1
      end
    end

    buff
  end

  val = @type
  if has_type?
    buff << 0x10

    loop do
      byte = val & 0x7F

      val >>= 7
      # This drops the top bits,
      # Otherwise, with a signed right shift,
      # we get infinity one bits at the top
      val &= (1 << 57) - 1

      byte |= 0x80 if val != 0
      buff << byte
      break if val == 0
    end
  end
  buff << @_unknown_fields if @_unknown_fields
  buff
end