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diff --git a/jni/ruby/ext/nkf/lib/kconv.rb b/jni/ruby/ext/nkf/lib/kconv.rb
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+#
+# kconv.rb - Kanji Converter.
+#
+# $Id: kconv.rb 30112 2010-12-07 11:47:39Z naruse $
+#
+# ----
+#
+# kconv.rb implements the Kconv class for Kanji Converter.  Additionally,
+# some methods in String classes are added to allow easy conversion.
+#
+
+require 'nkf'
+
+#
+# Kanji Converter for Ruby.
+#
+module Kconv
+  #
+  # Public Constants
+  #
+
+  #Constant of Encoding
+
+  # Auto-Detect
+  AUTO = NKF::AUTO
+  # ISO-2022-JP
+  JIS = NKF::JIS
+  # EUC-JP
+  EUC = NKF::EUC
+  # Shift_JIS
+  SJIS = NKF::SJIS
+  # BINARY
+  BINARY = NKF::BINARY
+  # NOCONV
+  NOCONV = NKF::NOCONV
+  # ASCII
+  ASCII = NKF::ASCII
+  # UTF-8
+  UTF8 = NKF::UTF8
+  # UTF-16
+  UTF16 = NKF::UTF16
+  # UTF-32
+  UTF32 = NKF::UTF32
+  # UNKNOWN
+  UNKNOWN = NKF::UNKNOWN
+
+  #
+  # Public Methods
+  #
+
+  # call-seq:
+  #    Kconv.kconv(str, to_enc, from_enc=nil)
+  #
+  # Convert <code>str</code> to <code>to_enc</code>.
+  # <code>to_enc</code> and <code>from_enc</code> are given as constants of Kconv or Encoding objects.
+  def kconv(str, to_enc, from_enc=nil)
+    opt = ''
+    opt += ' --ic=' + from_enc.to_s if from_enc
+    opt += ' --oc=' + to_enc.to_s if to_enc
+
+    ::NKF::nkf(opt, str)
+  end
+  module_function :kconv
+
+  #
+  # Encode to
+  #
+
+  # call-seq:
+  #    Kconv.tojis(str)   => string
+  #
+  # Convert <code>str</code> to ISO-2022-JP
+  def tojis(str)
+    kconv(str, JIS)
+  end
+  module_function :tojis
+
+  # call-seq:
+  #    Kconv.toeuc(str)   => string
+  #
+  # Convert <code>str</code> to EUC-JP
+  def toeuc(str)
+    kconv(str, EUC)
+  end
+  module_function :toeuc
+
+  # call-seq:
+  #    Kconv.tosjis(str)   => string
+  #
+  # Convert <code>str</code> to Shift_JIS
+  def tosjis(str)
+    kconv(str, SJIS)
+  end
+  module_function :tosjis
+
+  # call-seq:
+  #    Kconv.toutf8(str)   => string
+  #
+  # Convert <code>str</code> to UTF-8
+  def toutf8(str)
+    kconv(str, UTF8)
+  end
+  module_function :toutf8
+
+  # call-seq:
+  #    Kconv.toutf16(str)   => string
+  #
+  # Convert <code>str</code> to UTF-16
+  def toutf16(str)
+    kconv(str, UTF16)
+  end
+  module_function :toutf16
+
+  # call-seq:
+  #    Kconv.toutf32(str)   => string
+  #
+  # Convert <code>str</code> to UTF-32
+  def toutf32(str)
+    kconv(str, UTF32)
+  end
+  module_function :toutf32
+
+  # call-seq:
+  #    Kconv.tolocale   => string
+  #
+  # Convert <code>self</code> to locale encoding
+  def tolocale(str)
+    kconv(str, Encoding.locale_charmap)
+  end
+  module_function :tolocale
+
+  #
+  # guess
+  #
+
+  # call-seq:
+  #    Kconv.guess(str)   => encoding
+  #
+  # Guess input encoding by NKF.guess
+  def guess(str)
+    ::NKF::guess(str)
+  end
+  module_function :guess
+
+  #
+  # isEncoding
+  #
+
+  # call-seq:
+  #    Kconv.iseuc(str)   => true or false
+  #
+  # Returns whether input encoding is EUC-JP or not.
+  #
+  # *Note* don't expect this return value is MatchData.
+  def iseuc(str)
+    str.dup.force_encoding(EUC).valid_encoding?
+  end
+  module_function :iseuc
+
+  # call-seq:
+  #    Kconv.issjis(str)   => true or false
+  #
+  # Returns whether input encoding is Shift_JIS or not.
+  def issjis(str)
+    str.dup.force_encoding(SJIS).valid_encoding?
+  end
+  module_function :issjis
+
+  # call-seq:
+  #    Kconv.isjis(str)   => true or false
+  #
+  # Returns whether input encoding is ISO-2022-JP or not.
+  def isjis(str)
+    /\A [\t\n\r\x20-\x7E]*
+      (?:
+        (?:\x1b \x28 I      [\x21-\x7E]*
+          |\x1b \x28 J      [\x21-\x7E]*
+          |\x1b \x24 @      (?:[\x21-\x7E]{2})*
+          |\x1b \x24 B      (?:[\x21-\x7E]{2})*
+          |\x1b \x24 \x28 D (?:[\x21-\x7E]{2})*
+        )*
+        \x1b \x28 B [\t\n\r\x20-\x7E]*
+      )*
+     \z/nox =~ str.dup.force_encoding('BINARY') ? true : false
+  end
+  module_function :isjis
+
+  # call-seq:
+  #    Kconv.isutf8(str)   => true or false
+  #
+  # Returns whether input encoding is UTF-8 or not.
+  def isutf8(str)
+    str.dup.force_encoding(UTF8).valid_encoding?
+  end
+  module_function :isutf8
+end
+
+class String
+  # call-seq:
+  #    String#kconv(to_enc, from_enc)
+  #
+  # Convert <code>self</code> to <code>to_enc</code>.
+  # <code>to_enc</code> and <code>from_enc</code> are given as constants of Kconv or Encoding objects.
+  def kconv(to_enc, from_enc=nil)
+    from_enc = self.encoding if !from_enc && self.encoding != Encoding.list[0]
+    Kconv::kconv(self, to_enc, from_enc)
+  end
+
+  #
+  # to Encoding
+  #
+
+  # call-seq:
+  #    String#tojis   => string
+  #
+  # Convert <code>self</code> to ISO-2022-JP
+  def tojis; Kconv.tojis(self) end
+
+  # call-seq:
+  #    String#toeuc   => string
+  #
+  # Convert <code>self</code> to EUC-JP
+  def toeuc; Kconv.toeuc(self) end
+
+  # call-seq:
+  #    String#tosjis   => string
+  #
+  # Convert <code>self</code> to Shift_JIS
+  def tosjis; Kconv.tosjis(self) end
+
+  # call-seq:
+  #    String#toutf8   => string
+  #
+  # Convert <code>self</code> to UTF-8
+  def toutf8; Kconv.toutf8(self) end
+
+  # call-seq:
+  #    String#toutf16   => string
+  #
+  # Convert <code>self</code> to UTF-16
+  def toutf16; Kconv.toutf16(self) end
+
+  # call-seq:
+  #    String#toutf32   => string
+  #
+  # Convert <code>self</code> to UTF-32
+  def toutf32; Kconv.toutf32(self) end
+
+  # call-seq:
+  #    String#tolocale   => string
+  #
+  # Convert <code>self</code> to locale encoding
+  def tolocale; Kconv.tolocale(self) end
+
+  #
+  # is Encoding
+  #
+
+  # call-seq:
+  #    String#iseuc   => true or false
+  #
+  # Returns whether <code>self</code>'s encoding is EUC-JP or not.
+  def iseuc;	Kconv.iseuc(self) end
+
+  # call-seq:
+  #    String#issjis   => true or false
+  #
+  # Returns whether <code>self</code>'s encoding is Shift_JIS or not.
+  def issjis;	Kconv.issjis(self) end
+
+  # call-seq:
+  #    String#isjis   => true or false
+  #
+  # Returns whether <code>self</code>'s encoding is ISO-2022-JP or not.
+  def isjis;	Kconv.isjis(self) end
+
+  # call-seq:
+  #    String#isutf8   => true or false
+  #
+  # Returns whether <code>self</code>'s encoding is UTF-8 or not.
+  def isutf8;	Kconv.isutf8(self) end
+end