1 files changed, 116 insertions, 0 deletions
diff --git a/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SJISProber.cs b/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SJISProber.cs
new file mode 100644
index 000000000..515cd2498
--- /dev/null
+++ b/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SJISProber.cs
@@ -0,0 +1,116 @@
+/* ***** 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 ***** */
+
+namespace UniversalDetector.Core
+{
+    /// <summary>
+    /// for S-JIS encoding, observe characteristic:
+    /// 1, kana character (or hankaku?) often have hight frequency of appereance
+    /// 2, kana character often exist in group
+    /// 3, certain combination of kana is never used in japanese language
+    /// </summary>
+    public class SJISProber : CharsetProber
+    {
+        private CodingStateMachine codingSM;
+        private SJISContextAnalyser contextAnalyser;
+        private SJISDistributionAnalyser distributionAnalyser;
+        private byte[] lastChar = new byte[2];
+    
+        public SJISProber()
+        {
+            codingSM = new CodingStateMachine(new SJISSMModel());
+            distributionAnalyser = new SJISDistributionAnalyser();
+            contextAnalyser = new SJISContextAnalyser(); 
+            Reset();
+        }
+        
+        public override string GetCharsetName()
+        {
+            return "Shift-JIS";        
+        }
+        
+        public override ProbingState HandleData(byte[] buf, int offset, int len)
+        {
+            int codingState;
+            int max = offset + len;
+            
+            for (int i = offset; i < max; i++) {
+                codingState = codingSM.NextState(buf[i]);
+                if (codingState == SMModel.ERROR) {
+                    state = ProbingState.NotMe;
+                    break;
+                }
+                if (codingState == SMModel.ITSME) {
+                    state = ProbingState.FoundIt;
+                    break;
+                }
+                if (codingState == SMModel.START) {
+                    int charLen = codingSM.CurrentCharLen;
+                    if (i == offset) {
+                        lastChar[1] = buf[offset];
+                        contextAnalyser.HandleOneChar(lastChar, 2-charLen, charLen);
+                        distributionAnalyser.HandleOneChar(lastChar, 0, charLen);
+                    } else {
+                        contextAnalyser.HandleOneChar(buf, i+1-charLen, charLen);
+                        distributionAnalyser.HandleOneChar(buf, i-1, charLen);
+                    }
+                }
+            } 
+            lastChar[0] = buf[max-1];
+            if (state == ProbingState.Detecting)
+                if (contextAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD)
+                    state = ProbingState.FoundIt;
+            return state;
+        }
+
+        public override void Reset()
+        {
+            codingSM.Reset(); 
+            state = ProbingState.Detecting;
+            contextAnalyser.Reset();
+            distributionAnalyser.Reset();
+        }
+        
+        public override float GetConfidence()
+        {
+            float contxtCf = contextAnalyser.GetConfidence();
+            float distribCf = distributionAnalyser.GetConfidence();
+            return (contxtCf > distribCf ? contxtCf : distribCf);
+        }
+    }
+}