update encoding detection

Emby.Common.Implementations/TextEncoding/UniversalDetector/Core/SequenceModel.cs

@@ -0,0 +1,97 @@
+/* ***** 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 Universal charset detector code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *          Shy Shalom <shooshX@gmail.com>
+ *          Rudi Pettazzi <rudi.pettazzi@gmail.com> (C# port)
+ * 
+ * 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 ***** */
+
+using System;
+
+namespace UniversalDetector.Core
+{   
+    public abstract class SequenceModel
+    {
+        // [256] table use to find a char's order
+        protected byte[] charToOrderMap;
+        
+        // [SAMPLE_SIZE][SAMPLE_SIZE] table to find a 2-char sequence's 
+        // frequency        
+        protected byte[] precedenceMatrix;
+        
+        // freqSeqs / totalSeqs
+        protected float typicalPositiveRatio;
+        
+        public float TypicalPositiveRatio {
+            get { return typicalPositiveRatio; }
+        }
+        
+        // not used            
+        protected bool keepEnglishLetter;
+        
+        public bool KeepEnglishLetter {
+            get { return keepEnglishLetter; }
+        }
+        
+        protected String charsetName;
+
+        public string CharsetName {
+            get { return charsetName; }
+        }
+        
+        public SequenceModel(
+                byte[] charToOrderMap,
+                byte[] precedenceMatrix,
+                float typicalPositiveRatio,
+                bool keepEnglishLetter,
+                String charsetName)
+        {
+            this.charToOrderMap = charToOrderMap;
+            this.precedenceMatrix = precedenceMatrix;
+            this.typicalPositiveRatio = typicalPositiveRatio;
+            this.keepEnglishLetter = keepEnglishLetter;
+            this.charsetName = charsetName;
+        }
+        
+        public byte GetOrder(byte b)
+        {
+            return charToOrderMap[b];
+        }
+        
+        public byte GetPrecedence(int pos)
+        {
+            return precedenceMatrix[pos];
+        }
+        
+    }
+}