merge common implementations and server implementations

1 files changed, 180 insertions, 0 deletions

diff --git a/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/Latin1Prober.cs b/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/Latin1Prober.cs
new file mode 100644
index 000000000..c79a10aa7
--- /dev/null
+++ b/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/Latin1Prober.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
+{
+    // TODO: Using trigrams the detector should be able to discriminate between 
+    // latin-1 and iso8859-2
+    public class Latin1Prober : CharsetProber
+    {
+        private const int FREQ_CAT_NUM = 4;
+
+        private const int UDF = 0;       // undefined
+        private const int OTH = 1;       // other
+        private const int ASC = 2;       // ascii capital letter
+        private const int ASS = 3;       // ascii small letter
+        private const int ACV = 4;       // accent capital vowel
+        private const int ACO = 5;       // accent capital other
+        private const int ASV = 6;       // accent small vowel
+        private const int ASO = 7;       // accent small other
+        
+        private const int CLASS_NUM = 8; // total classes
+        
+        private readonly static byte[] Latin1_CharToClass = {
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // 00 - 07
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // 08 - 0F
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // 10 - 17
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // 18 - 1F
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // 20 - 27
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // 28 - 2F
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // 30 - 37
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // 38 - 3F
+          OTH, ASC, ASC, ASC, ASC, ASC, ASC, ASC,   // 40 - 47
+          ASC, ASC, ASC, ASC, ASC, ASC, ASC, ASC,   // 48 - 4F
+          ASC, ASC, ASC, ASC, ASC, ASC, ASC, ASC,   // 50 - 57
+          ASC, ASC, ASC, OTH, OTH, OTH, OTH, OTH,   // 58 - 5F
+          OTH, ASS, ASS, ASS, ASS, ASS, ASS, ASS,   // 60 - 67
+          ASS, ASS, ASS, ASS, ASS, ASS, ASS, ASS,   // 68 - 6F
+          ASS, ASS, ASS, ASS, ASS, ASS, ASS, ASS,   // 70 - 77
+          ASS, ASS, ASS, OTH, OTH, OTH, OTH, OTH,   // 78 - 7F
+          OTH, UDF, OTH, ASO, OTH, OTH, OTH, OTH,   // 80 - 87
+          OTH, OTH, ACO, OTH, ACO, UDF, ACO, UDF,   // 88 - 8F
+          UDF, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // 90 - 97
+          OTH, OTH, ASO, OTH, ASO, UDF, ASO, ACO,   // 98 - 9F
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // A0 - A7
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // A8 - AF
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // B0 - B7
+          OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH,   // B8 - BF
+          ACV, ACV, ACV, ACV, ACV, ACV, ACO, ACO,   // C0 - C7
+          ACV, ACV, ACV, ACV, ACV, ACV, ACV, ACV,   // C8 - CF
+          ACO, ACO, ACV, ACV, ACV, ACV, ACV, OTH,   // D0 - D7
+          ACV, ACV, ACV, ACV, ACV, ACO, ACO, ACO,   // D8 - DF
+          ASV, ASV, ASV, ASV, ASV, ASV, ASO, ASO,   // E0 - E7
+          ASV, ASV, ASV, ASV, ASV, ASV, ASV, ASV,   // E8 - EF
+          ASO, ASO, ASV, ASV, ASV, ASV, ASV, OTH,   // F0 - F7
+          ASV, ASV, ASV, ASV, ASV, ASO, ASO, ASO,   // F8 - FF
+        };
+
+        /* 0 : illegal 
+           1 : very unlikely 
+           2 : normal 
+           3 : very likely
+        */
+        private readonly static byte[] Latin1ClassModel = {
+            /*      UDF OTH ASC ASS ACV ACO ASV ASO  */
+            /*UDF*/  0,  0,  0,  0,  0,  0,  0,  0,
+            /*OTH*/  0,  3,  3,  3,  3,  3,  3,  3,
+            /*ASC*/  0,  3,  3,  3,  3,  3,  3,  3, 
+            /*ASS*/  0,  3,  3,  3,  1,  1,  3,  3,
+            /*ACV*/  0,  3,  3,  3,  1,  2,  1,  2,
+            /*ACO*/  0,  3,  3,  3,  3,  3,  3,  3, 
+            /*ASV*/  0,  3,  1,  3,  1,  1,  1,  3, 
+            /*ASO*/  0,  3,  1,  3,  1,  1,  3,  3,
+        };
+
+        private byte lastCharClass;
+        private int[] freqCounter = new int[FREQ_CAT_NUM];
+        
+        public Latin1Prober()
+        {
+            Reset();
+        }
+
+        public override string GetCharsetName() 
+        {
+            return "windows-1252";
+        }
+        
+        public override void Reset()
+        {
+            state = ProbingState.Detecting;
+            lastCharClass = OTH;
+            for (int i = 0; i < FREQ_CAT_NUM; i++)
+                freqCounter[i] = 0;
+        }
+        
+        public override ProbingState HandleData(byte[] buf, int offset, int len)
+        {
+            byte[] newbuf = FilterWithEnglishLetters(buf, offset, len);
+            byte charClass, freq;
+            
+            for (int i = 0; i < newbuf.Length; i++) {
+                charClass = Latin1_CharToClass[newbuf[i]];
+                freq = Latin1ClassModel[lastCharClass * CLASS_NUM + charClass];
+                if (freq == 0) {
+                  state = ProbingState.NotMe;
+                  break;
+                }
+                freqCounter[freq]++;
+                lastCharClass = charClass;
+            }
+            return state;
+        }
+
+        public override float GetConfidence()
+        {
+            if (state == ProbingState.NotMe)
+                return 0.01f;
+            
+            float confidence = 0.0f;
+            int total = 0;
+            for (int i = 0; i < FREQ_CAT_NUM; i++) {
+                total += freqCounter[i];
+            }
+            
+            if (total <= 0) {
+                confidence = 0.0f;
+            } else {
+                confidence = freqCounter[3] * 1.0f / total;
+                confidence -= freqCounter[1] * 20.0f / total;
+            }
+            
+            // lower the confidence of latin1 so that other more accurate detector 
+            // can take priority.
+            return confidence < 0.0f ? 0.0f : confidence * 0.5f;
+        }
+
+        public override void DumpStatus()
+        {
+            //Console.WriteLine(" Latin1Prober: {0} [{1}]", GetConfidence(), GetCharsetName());
+        }
+    }
+}
+