hex dump for lua

hexdump.lua

local function hex_dump(buf)
      for byte=1, #buf, 16 do
         local chunk = buf:sub(byte, byte + 15)
         io.write(string.format('%08X  ', byte - 1))
         chunk:gsub('.', function (c) io.write(string.format('%02X ', string.byte(c))) end)
         io.write(string.rep(' ', 3 * (16 - #chunk)))
         io.write(' ', chunk:gsub('%c', '.'), "\n")
      end
end