Code (save as fc.rb)
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#!/usr/bin/ruby
# simple binary file compare (c) http://zed.0xff.me
# like good old DOS "fc /b"
if ARGV.size < 2
puts("[!] gimme at least two filenames")
exit
end
handles = ARGV.map{ |fname| open(fname) }
while !handles.any?(&:eof)
bytes = handles.map(&:readbyte)
if bytes.uniq.size > 1
@diff = true
printf "%08x:"+" %02x"*handles.size+"\n", handles[0].pos-1, *bytes
end
end
unless handles.all?(&:eof)
@diff = true
puts
ARGV.each do |fname|
printf "[!] %20s is %8d bytes long\n", fname, File.size(fname)
end
end
puts "[.] all files are identical" unless @diff
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Sample output
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#fc.rb black.png white.png
0000003e: 00 ff
0000003f: 00 ff
00000040: 00 ff
00000064: 23 92
00000065: 79 0a
00000066: 01 04
00000067: 05 02
00000068: 7f 83
00000069: 83 a9
0000006a: dc c5
0000006b: 13 01
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