import sys

def padlen(number):
  return ((16 - (number % 16)) * 3) + 1 + int(number % 16 < 8)

def hexdump(data):
  printed = []

  print(f"{0:08x}", end="  ")

  for idx in range(len(data)):
    print(f"{data[idx]:02x}", end=" ")

    if data[idx] < 128 and chr(data[idx]).isprintable():
      printed.append(chr(data[idx]))
    else:
      printed.append(".")

    if (idx + 1) % 8 == 0:
      print(end=" ")

    if idx == len(data) - 1:
      padding = ""

      if (idx + 1) % 16 != 0:
        padding = " " * padlen(idx + 1)

      print(f"{padding}|{''.join(printed)}|")
      print(f"{idx + 1:08x}")
    elif (idx + 1) % 16 == 0:
      print(f"|{''.join(printed)}|")
      print(f"{idx + 1:08x}", end="  ")
      printed.clear()

if len(sys.argv) > 1:
  with open(sys.argv[1], "rb") as handle:
    data = handle.read()

  hexdump(data)