Module: ZPNG::Hexdump

Included in:
CLI
Defined in:
lib/zpng/hexdump.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.dump(data, h = {}) ⇒ Object 



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# File 'lib/zpng/hexdump.rb', line 11

def dump data, h = {}
  offset = h[:offset] || 0
  add    = h[:add]    || 0
  size   = h[:size]   || (data.size-offset)
  tail   = h[:tail]   || "\n"
  width  = h[:width]  || 0x10                 # row width, in bytes

  h[:show_offset] = true unless h.key?(:show_offset)
  h[:dedup]       = true unless h.key?(:dedup)

  size = data.size-offset if size+offset > data.size

  r = ''; prevhex = ''; c = nil; prevdup = false
  while true
    ascii = ''; hex = ''
    width.times do |i|
      hex << ' ' if i%8==0 && i>0
      if c = ((size > 0) && data[offset+i])
        hex << "%02x " % c.ord
        ascii << ((32..126).include?(c.ord) ? c : '.')
      else
        hex << '   '
        ascii << ' '
      end
      size-=1
    end

    if h[:dedup] && hex == prevhex
      row = "*"
      yield(row, offset+add, ascii) if block_given?
      r << row << "\n" unless prevdup
      prevdup = true
    else
      row = (h[:show_offset] ?  ("%08x: " % (offset + add)) : '') + hex + ' |' + ascii + "|"
      yield(row, offset+add, ascii) if block_given?
      r << row << "\n"
      prevdup = false
    end

    offset += width
    prevhex = hex
    break if size <= 0
  end
  if h[:show_offset] && prevdup
    row = "%08x: " % (offset + add)
    yield(row) if block_given?
    r << row
  end
  r.chomp + tail
end

Instance Method Details

#hexdump(*args, &block) ⇒ Object 



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# File 'lib/zpng/hexdump.rb', line 6

def hexdump *args, &block
  print Hexdump.dump(*args, &block)
end