Class: String

Inherits:
Object
  • Object
show all
Defined in:
lib/ansible/knx/hexdump.rb

Instance Method Summary collapse

Instance Method Details

#hexdump(sparse = false) ⇒ Object

prints out a good’ol hexdump of the data contained in the string

parameters: sparse: true / false do we want to print multiple lines with zero values?



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# File 'lib/ansible/knx/hexdump.rb', line 33

def hexdump(sparse = false)
   selfsize = self.size
   first = true

   print "\n index       0 1 2 3  4 5 6 7  8 9 A B  C D E F\n\n"

   lines,rest = selfsize.divmod(16)
   address = 0; i = 0    # we count them independently for future extension.

   while lines > 0
      str = self[i..i+15]
      
      # we don't print lines with all zeroes, unless it's the last line

      if str == "\0"*16     # if the 16 bytes are all zero
      
        if (!sparse) || (sparse &&  lines == 1 && rest == 0)
           str.tr!("\000-\037\177-\377",'.')
           printf( "%08x    %8s %8s %8s %8s    %s\n", 
              address, self[i..i+3].unpack('H8'), self[i+4..i+7].unpack('H8'),
              self[i+8..i+11].unpack('H8'), self[i+12..i+15].unpack('H8'), str)
        else
              print "  ....      00 .. 00 00 .. 00 00 .. 00 00 .. 00    ................\n" if first
              first = false
 end

      else  # print string which is not all zeros

        str.tr!("\000-\037\177-\377",'.')
        printf( "%08x    %8s %8s %8s %8s    %s\n", 
              address, self[i..i+3].unpack('H8'), self[i+4..i+7].unpack('H8'),
              self[i+8..i+11].unpack('H8'), self[i+12..i+15].unpack('H8'), str)
        first = true
	end
      i += 16; address += 16; lines -= 1
   end
   
   # now do the remaining bytes, which don't fit a full line..
   # yikes - this is truly ugly!  REWRITE THIS!!

   if rest > 0
      chunks2,rest2 = rest.divmod(4)     
      j = i; k = 0
      if (i < selfsize)
         printf( "%08x    ", address)
         while (i < selfsize)
              printf "%02x", self[i]
              i += 1; k += 1
              print  " " if ((i % 4) == 0)
         end
         for i in (k..15)
                print "  "
         end
         str = self[j..selfsize]
         str.tr!("\000-\037\177-\377",'.')
         print " " * (4 - chunks2+1)
         printf("  %s\n", str)
      end
   end
end