update encoding detection

1 files changed, 90 insertions, 0 deletions

diff --git a/Emby.Common.Implementations/TextEncoding/UniversalDetector/Core/CodingStateMachine.cs b/Emby.Common.Implementations/TextEncoding/UniversalDetector/Core/CodingStateMachine.cs
new file mode 100644
index 000000000..f837dd966
--- /dev/null
+++ b/Emby.Common.Implementations/TextEncoding/UniversalDetector/Core/CodingStateMachine.cs
@@ -0,0 +1,90 @@
+/* ***** 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.org 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):
+ *          Shy Shalom <shooshX@gmail.com>
+ *          Kohei TAKETA <k-tak@void.in> (Java port)
+ *          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 ***** */
+
+namespace UniversalDetector.Core
+{
+    /// <summary>
+    /// Parallel state machine for the Coding Scheme Method
+    /// </summary>
+    public class CodingStateMachine
+    {
+        private int currentState;
+        private SMModel model;
+        private int currentCharLen;
+        private int currentBytePos;
+        
+        public CodingStateMachine(SMModel model) 
+        {
+            this.currentState = SMModel.START;
+            this.model = model;
+        }
+
+        public int NextState(byte b)
+        {
+            // for each byte we get its class, if it is first byte, 
+            // we also get byte length
+            int byteCls = model.GetClass(b);
+            if (currentState == SMModel.START) { 
+                currentBytePos = 0;
+                currentCharLen = model.charLenTable[byteCls];
+            }
+            
+            // from byte's class and stateTable, we get its next state            
+            currentState = model.stateTable.Unpack(
+                currentState * model.ClassFactor + byteCls);
+            currentBytePos++;
+            return currentState;
+        }
+  
+        public void Reset() 
+        { 
+            currentState = SMModel.START; 
+        }
+
+        public int CurrentCharLen 
+        { 
+            get { return currentCharLen; } 
+        }
+
+        public string ModelName 
+        { 
+            get { return model.Name; } 
+        }
+    }
+}