1 files changed, 105 insertions, 0 deletions
diff --git a/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/EscCharsetProber.cs b/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/EscCharsetProber.cs
new file mode 100644
index 000000000..e9cefa9bc
--- /dev/null
+++ b/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/EscCharsetProber.cs
@@ -0,0 +1,105 @@
+/* ***** 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
+{
+    public class EscCharsetProber : CharsetProber
+    {
+        private const int CHARSETS_NUM = 4;
+        private string detectedCharset;
+        private CodingStateMachine[] codingSM; 
+        int activeSM;
+
+        public EscCharsetProber()
+        {
+            codingSM = new CodingStateMachine[CHARSETS_NUM]; 
+            codingSM[0] = new CodingStateMachine(new HZSMModel());
+            codingSM[1] = new CodingStateMachine(new ISO2022CNSMModel());
+            codingSM[2] = new CodingStateMachine(new ISO2022JPSMModel());
+            codingSM[3] = new CodingStateMachine(new ISO2022KRSMModel());
+            Reset();
+        }
+        
+        public override void Reset()
+        {
+            state = ProbingState.Detecting;
+            for (int i = 0; i < CHARSETS_NUM; i++)
+                codingSM[i].Reset();
+            activeSM = CHARSETS_NUM;
+            detectedCharset = null;
+        }
+
+        public override ProbingState HandleData(byte[] buf, int offset, int len)
+        {
+            int max = offset + len;
+            
+            for (int i = offset; i < max && state == ProbingState.Detecting; i++) {
+                for (int j = activeSM - 1; j >= 0; j--) {
+                    // byte is feed to all active state machine
+                    int codingState = codingSM[j].NextState(buf[i]);
+                    if (codingState == SMModel.ERROR)  {
+                        // got negative answer for this state machine, make it inactive
+                        activeSM--;
+                        if (activeSM == 0) {
+                            state = ProbingState.NotMe;
+                            return state;
+                        } else if (j != activeSM) {
+                            CodingStateMachine t = codingSM[activeSM];
+                            codingSM[activeSM] = codingSM[j];
+                            codingSM[j] = t;
+                        }
+                    } else if (codingState == SMModel.ITSME) {
+                        state = ProbingState.FoundIt;
+                        detectedCharset = codingSM[j].ModelName;
+                        return state;
+                    }
+                }
+            }
+            return state;
+        }
+
+        public override string GetCharsetName()
+        {
+            return detectedCharset;        
+        }
+        
+        public override float GetConfidence()
+        {
+            return 0.99f;
+        }           
+    }
+}