Data commit

Task/Bitwise-IO/Ruby/bitwise-io.rb

@@ -0,0 +1,35 @@
+def crunch(ascii)
+  bitstring = ascii.bytes.collect {|b| "%07b" % b}.join
+  [bitstring].pack("B*")
+end
+
+def expand(binary)
+  bitstring = binary.unpack("B*")[0]
+  bitstring.scan(/[01]{7}/).collect {|b| b.to_i(2).chr}.join
+end
+
+original = "This is an ascii string that will be crunched, written, read and expanded."
+puts "my ascii string is #{original.length} bytes"
+
+filename = "crunched.out"
+
+# write the compressed data
+File.open(filename, "w") do |fh|
+  fh.binmode
+  fh.print crunch(original)
+end
+
+filesize = File.size(filename)
+puts "the file containing the crunched text is #{filesize} bytes"
+
+# read and expand
+expanded = File.open(filename, "r") do |fh|
+  fh.binmode
+  expand(fh.read)
+end
+
+if original == expanded
+  puts "success"
+else
+  puts "fail!"
+end