Support correctly decoding \u{X..} unicode chars in Encoding::Ruby.unescape.

Author: postmodern

lib/ronin/support/encoding/ruby.rb

@@ -178,8 +178,10 @@ def self.unescape(data)
           scanner   = StringScanner.new(data)
 
           until scanner.eos?
-            unescaped << if (unicode_escape      = scanner.scan(/\\u[0-9a-fA-F]{4,8}/))
+            unescaped << if (unicode_escape      = scanner.scan(/\\u[0-9a-fA-F]{4}/))
                            unicode_escape[2..].to_i(16).chr(Encoding::UTF_8)
+                         elsif (unicode_escape   = scanner.scan(/\\u\{[0-9a-fA-F]{1,6}\}/))
+                           unicode_escape[3..-2].to_i(16).chr(Encoding::UTF_8)
                          elsif (hex_escape       = scanner.scan(/\\x[0-9a-fA-F]{1,2}/))
                            hex_escape[2..].to_i(16).chr
                          elsif (octal_escape     = scanner.scan(/\\[0-7]{1,3}/))

spec/encoding/ruby/core_ext/string_spec.rb

@@ -73,7 +73,7 @@
     end
 
     context "when the String contains escaped unicode characters" do
-      subject { "\\u00D8\\u2070E" }
+      subject { "\\u00D8\\u{2070E}" }
 
       let(:unescaped) { "Ø𠜎" }
 

spec/encoding/ruby_spec.rb

@@ -178,7 +178,7 @@
     end
 
     context "when the given String contains escaped unicode characters" do
-      let(:data)      { "\\u00D8\\u2070E" }
+      let(:data)      { "\\u00D8\\u{2070E}" }
       let(:unescaped) { "Ø𠜎" }
 
       it "must unescape the hexadecimal characters" do