lib/rasn1.rb in rasn1-0.5.0 vs lib/rasn1.rb in rasn1-0.6.0

@@ -27,6 +27,37 @@
   class ChoiceError < RASN1::Error
     def message
       "CHOICE #@name: #chosen not set"
     end
   end
+  
+  # Parse a DER/BER string without checking a model
+  # @note If you want to check ASN.1 grammary, you should define a {Model}
+  #       and use {Model#parse}.
+  # @note This method will never decode SEQUENCE OF or SET OF objects, as these
+  #       ones use the same encoding as SEQUENCE and SET, respectively.
+  # @note Real type of tagged value cannot be guessed. So, such tag will
+  #       generate {Types::Base} objects.
+  # @param [String] der binary string to parse
+  # @param [Boolean] ber if +true+, decode a BER string, else a DER one
+  # @return [Types::Base]
+  def self.parse(der, ber: false)
+    root = nil
+    while der.size > 0
+      type = Types.tag2type(der[0].ord)
+      type.parse!(der, ber: ber)
+      root = type if root.nil?
+
+      if [Types::Sequence, Types::Set].include? type.class
+        subder = type.value
+        ary = []
+        while subder.size > 0
+          ary << self.parse(subder)
+          subder = subder[ary.last.to_der.size..-1]
+        end
+        type.value = ary
+      end
+      der = der[type.to_der.size..-1]
+    end
+    root
+  end
 end