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diff --git a/libcharsetdetect/mozilla/extensions/universalchardet/src/base/CharDistribution.cpp b/libcharsetdetect/mozilla/extensions/universalchardet/src/base/CharDistribution.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "CharDistribution.h"
+
+#include "JISFreq.tab"
+#include "Big5Freq.tab"
+#include "EUCKRFreq.tab"
+#include "EUCTWFreq.tab"
+#include "GB2312Freq.tab"
+
+#define SURE_YES 0.99f
+#define SURE_NO 0.01f
+
+#define MINIMUM_DATA_THRESHOLD 4
+
+//return confidence base on received data
+float CharDistributionAnalysis::GetConfidence()
+{
+ //if we didn't receive any character in our consideration range, or the
+ // number of frequent characters is below the minimum threshold, return
+ // negative answer
+ if (mTotalChars <= 0 || mFreqChars <= MINIMUM_DATA_THRESHOLD)
+ return SURE_NO;
+
+ if (mTotalChars != mFreqChars) {
+ float r = mFreqChars / ((mTotalChars - mFreqChars) * mTypicalDistributionRatio);
+
+ if (r < SURE_YES)
+ return r;
+ }
+ //normalize confidence, (we don't want to be 100% sure)
+ return SURE_YES;
+}
+
+EUCTWDistributionAnalysis::EUCTWDistributionAnalysis()
+{
+ mCharToFreqOrder = EUCTWCharToFreqOrder;
+ mTableSize = EUCTW_TABLE_SIZE;
+ mTypicalDistributionRatio = EUCTW_TYPICAL_DISTRIBUTION_RATIO;
+}
+
+EUCKRDistributionAnalysis::EUCKRDistributionAnalysis()
+{
+ mCharToFreqOrder = EUCKRCharToFreqOrder;
+ mTableSize = EUCKR_TABLE_SIZE;
+ mTypicalDistributionRatio = EUCKR_TYPICAL_DISTRIBUTION_RATIO;
+}
+
+GB2312DistributionAnalysis::GB2312DistributionAnalysis()
+{
+ mCharToFreqOrder = GB2312CharToFreqOrder;
+ mTableSize = GB2312_TABLE_SIZE;
+ mTypicalDistributionRatio = GB2312_TYPICAL_DISTRIBUTION_RATIO;
+}
+
+Big5DistributionAnalysis::Big5DistributionAnalysis()
+{
+ mCharToFreqOrder = Big5CharToFreqOrder;
+ mTableSize = BIG5_TABLE_SIZE;
+ mTypicalDistributionRatio = BIG5_TYPICAL_DISTRIBUTION_RATIO;
+}
+
+SJISDistributionAnalysis::SJISDistributionAnalysis()
+{
+ mCharToFreqOrder = JISCharToFreqOrder;
+ mTableSize = JIS_TABLE_SIZE;
+ mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO;
+}
+
+EUCJPDistributionAnalysis::EUCJPDistributionAnalysis()
+{
+ mCharToFreqOrder = JISCharToFreqOrder;
+ mTableSize = JIS_TABLE_SIZE;
+ mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO;
+}
+