Merge pull request #8 from rjackson/add_binary_data_utility_method

Fix is_binary_data? was removed in 1.9. Add binary_data? utility function

lib/cassandra-cql/statement.rb

@@ -87,7 +87,7 @@ def self.cast_to_cql(obj)
         obj.to_guid
       # There are corner cases where this is an invalid assumption but they are extremely rare.
       # The alternative is to make the user pack the data on their own .. let's not do that until we have to
-      elsif obj.kind_of?(String) and obj.is_binary_data?
+      elsif obj.kind_of?(String) and Utility.binary_data?(obj)
         escape(obj.unpack('H*')[0])
       else
         escape(obj.to_s)

lib/cassandra-cql/utility.rb

@@ -9,5 +9,9 @@ def self.compress(source, level=2)
     def self.decompress(source)
       Zlib::Inflate.inflate(source)
     end
+
+    def self.binary_data?(string)
+      ( string.count( "^ -~", "^\r\n" ).fdiv(string.size) > 0.3 || string.index( "\x00" ) ) unless string.empty?
+    end
   end
 end

spec/utility_spec.rb

@@ -5,7 +5,7 @@
   it "should return some valid gzipped stuff" do
     stuff = "This is some stuff"
     bytes = Utility.compress(stuff)
-    bytes.is_binary_data?.should be_true
+    Utility.binary_data?(bytes).should be_true
     Utility.decompress(bytes).should eq(stuff)
   end
 end