merge common implementations and server implementations

1 files changed, 180 insertions, 0 deletions

diff --git a/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SBCSGroupProber.cs b/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SBCSGroupProber.cs
new file mode 100644
index 000000000..d8f496474
--- /dev/null
+++ b/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SBCSGroupProber.cs
@@ -0,0 +1,180 @@
+/* ***** 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 class SBCSGroupProber : CharsetProber
+    {
+        private const int PROBERS_NUM = 13;
+        private CharsetProber[] probers = new CharsetProber[PROBERS_NUM];        
+        private bool[] isActive = new bool[PROBERS_NUM];
+        private int bestGuess;
+        private int activeNum;
+        
+        public SBCSGroupProber()
+        {
+            probers[0] = new SingleByteCharSetProber(new Win1251Model());
+            probers[1] = new SingleByteCharSetProber(new Koi8rModel());
+            probers[2] = new SingleByteCharSetProber(new Latin5Model());
+            probers[3] = new SingleByteCharSetProber(new MacCyrillicModel());
+            probers[4] = new SingleByteCharSetProber(new Ibm866Model());
+            probers[5] = new SingleByteCharSetProber(new Ibm855Model());
+            probers[6] = new SingleByteCharSetProber(new Latin7Model());
+            probers[7] = new SingleByteCharSetProber(new Win1253Model());
+            probers[8] = new SingleByteCharSetProber(new Latin5BulgarianModel());
+            probers[9] = new SingleByteCharSetProber(new Win1251BulgarianModel());
+            HebrewProber hebprober = new HebrewProber();
+            probers[10] = hebprober;
+            // Logical  
+            probers[11] = new SingleByteCharSetProber(new Win1255Model(), false, hebprober); 
+            // Visual
+            probers[12] = new SingleByteCharSetProber(new Win1255Model(), true, hebprober); 
+            hebprober.SetModelProbers(probers[11], probers[12]);
+            // disable latin2 before latin1 is available, otherwise all latin1 
+            // will be detected as latin2 because of their similarity.
+            //probers[13] = new SingleByteCharSetProber(new Latin2HungarianModel());
+            //probers[14] = new SingleByteCharSetProber(new Win1250HungarianModel());            
+            Reset();
+        }
+  
+        public override ProbingState HandleData(byte[] buf, int offset, int len) 
+        {
+            ProbingState st = ProbingState.NotMe;
+            
+            //apply filter to original buffer, and we got new buffer back
+            //depend on what script it is, we will feed them the new buffer 
+            //we got after applying proper filter
+            //this is done without any consideration to KeepEnglishLetters
+            //of each prober since as of now, there are no probers here which
+            //recognize languages with English characters.
+            byte[] newBuf = FilterWithoutEnglishLetters(buf, offset, len);
+            if (newBuf.Length == 0)
+                return state; // Nothing to see here, move on.
+            
+            for (int i = 0; i < PROBERS_NUM; i++) {
+                if (!isActive[i])
+                    continue;
+                st = probers[i].HandleData(newBuf, 0, newBuf.Length);
+                
+                if (st == ProbingState.FoundIt) {
+                    bestGuess = i;
+                    state = ProbingState.FoundIt;
+                    break;
+                } else if (st == ProbingState.NotMe) {
+                    isActive[i] = false;
+                    activeNum--;
+                    if (activeNum <= 0) {
+                        state = ProbingState.NotMe;
+                        break;
+                    }
+                }
+            }
+            return state;
+        }
+
+        public override float GetConfidence()
+        {
+            float bestConf = 0.0f, cf;
+            switch (state) {
+            case ProbingState.FoundIt:
+                return 0.99f; //sure yes
+            case ProbingState.NotMe:
+                return 0.01f;  //sure no
+            default:
+                for (int i = 0; i < PROBERS_NUM; i++)
+                {
+                    if (!isActive[i])
+                        continue;
+                    cf = probers[i].GetConfidence();
+                    if (bestConf < cf)
+                    {
+                        bestConf = cf;
+                        bestGuess = i;
+                    }
+                }
+                break;
+            }
+            return bestConf;
+        }
+
+        public override void DumpStatus()
+        {
+            float cf = GetConfidence();
+           // Console.WriteLine(" SBCS Group Prober --------begin status");
+            for (int i = 0; i < PROBERS_NUM; i++) {
+                if (isActive[i])
+                    probers[i].DumpStatus();
+                //else
+                //Console.WriteLine(" inactive: [{0}] (i.e. confidence is too low).", probers[i].GetCharsetName());
+
+            }
+            //Console.WriteLine(" SBCS Group found best match [{0}] confidence {1}.",  probers[bestGuess].GetCharsetName(), cf);
+        }
+
+        public override void Reset ()
+        {
+            int activeNum = 0;
+            for (int i = 0; i < PROBERS_NUM; i++) {
+                if (probers[i] != null) {
+                    probers[i].Reset();
+                    isActive[i] = true;
+                    activeNum++;
+                } else {
+                    isActive[i] = false;
+                }
+            }
+            bestGuess = -1;
+            state = ProbingState.Detecting;
+        }
+
+        public override string GetCharsetName()
+        {
+            //if we have no answer yet
+            if (bestGuess == -1) {
+                GetConfidence();
+                //no charset seems positive
+                if (bestGuess == -1)
+                    bestGuess = 0;
+            }
+            return probers[bestGuess].GetCharsetName();
+        }
+
+    }
+}