Add support for Data Block Long

lib/rex/java/serialization/model/block_data_long.rb

@@ -0,0 +1,55 @@
+module Rex
+  module Java
+    module Serialization
+      module Model
+        # This class provides a block data (long) representation
+        class BlockDataLong < Element
+
+          # @!attribute length
+          #   @return [Integer] the length of the block
+          attr_accessor :length
+          # @!attribute contents
+          #   @return [String] the contents of the block
+          attr_accessor :contents
+
+          # @param contents [String] the contents of the block
+          def initialize(contents = '')
+            self.contents = contents
+            self.length = contents.length
+          end
+
+          # Unserializes a Java::Serialization::Model::BlockDataLong
+          #
+          # @param io [IO] the io to read from
+          # @return [self] if deserialization is possible
+          # @return [nil] if deserialization isn't possible
+          def decode(io)
+            raw_length = io.read(4)
+            return nil if raw_length.nil?
+            self.length = raw_length.unpack('N')[0]
+
+            if length == 0
+              self.contents = ''
+            else
+              self.contents = io.read(length)
+              return nil if contents.nil? || contents.length != length
+            end
+
+            self
+          end
+
+          # Serializes the Java::Serialization::Model::BlockDataLong
+          #
+          # @return [String] if serialization is possible
+          # @return [nil] if serialization isn't possible
+          def encode
+            encoded = [length].pack('N')
+            encoded << contents
+
+            encoded
+          end
+        end
+      end
+    end
+  end
+end