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Diffstat (limited to 'Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SBCharsetProber.cs')
| -rw-r--r-- | Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SBCharsetProber.cs | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SBCharsetProber.cs b/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SBCharsetProber.cs deleted file mode 100644 index 5a3496075..000000000 --- a/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SBCharsetProber.cs +++ /dev/null @@ -1,170 +0,0 @@ -/* ***** 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 SingleByteCharSetProber : CharsetProber - { - private const int SAMPLE_SIZE = 64; - private const int SB_ENOUGH_REL_THRESHOLD = 1024; - private const float POSITIVE_SHORTCUT_THRESHOLD = 0.95f; - private const float NEGATIVE_SHORTCUT_THRESHOLD = 0.05f; - private const int SYMBOL_CAT_ORDER = 250; - private const int NUMBER_OF_SEQ_CAT = 4; - private const int POSITIVE_CAT = NUMBER_OF_SEQ_CAT-1; - private const int NEGATIVE_CAT = 0; - - protected SequenceModel model; - - // true if we need to reverse every pair in the model lookup - bool reversed; - - // char order of last character - byte lastOrder; - - int totalSeqs; - int totalChar; - int[] seqCounters = new int[NUMBER_OF_SEQ_CAT]; - - // characters that fall in our sampling range - int freqChar; - - // Optional auxiliary prober for name decision. created and destroyed by the GroupProber - CharsetProber nameProber; - - public SingleByteCharSetProber(SequenceModel model) - : this(model, false, null) - { - - } - - public SingleByteCharSetProber(SequenceModel model, bool reversed, - CharsetProber nameProber) - { - this.model = model; - this.reversed = reversed; - this.nameProber = nameProber; - Reset(); - } - - public override ProbingState HandleData(byte[] buf, int offset, int len) - { - int max = offset + len; - - for (int i = offset; i < max; i++) { - byte order = model.GetOrder(buf[i]); - - if (order < SYMBOL_CAT_ORDER) - totalChar++; - - if (order < SAMPLE_SIZE) { - freqChar++; - - if (lastOrder < SAMPLE_SIZE) { - totalSeqs++; - if (!reversed) - ++(seqCounters[model.GetPrecedence(lastOrder*SAMPLE_SIZE+order)]); - else // reverse the order of the letters in the lookup - ++(seqCounters[model.GetPrecedence(order*SAMPLE_SIZE+lastOrder)]); - } - } - lastOrder = order; - } - - if (state == ProbingState.Detecting) { - if (totalSeqs > SB_ENOUGH_REL_THRESHOLD) { - float cf = GetConfidence(); - if (cf > POSITIVE_SHORTCUT_THRESHOLD) - state = ProbingState.FoundIt; - else if (cf < NEGATIVE_SHORTCUT_THRESHOLD) - state = ProbingState.NotMe; - } - } - return state; - } - - public override void DumpStatus() - { - //Console.WriteLine(" SBCS: {0} [{1}]", GetConfidence(), GetCharsetName()); - } - - public override float GetConfidence() - { - /* - NEGATIVE_APPROACH - if (totalSeqs > 0) { - if (totalSeqs > seqCounters[NEGATIVE_CAT] * 10) - return (totalSeqs - seqCounters[NEGATIVE_CAT] * 10)/totalSeqs * freqChar / mTotalChar; - } - return 0.01f; - */ - // POSITIVE_APPROACH - float r = 0.0f; - - if (totalSeqs > 0) { - r = 1.0f * seqCounters[POSITIVE_CAT] / totalSeqs / model.TypicalPositiveRatio; - r = r * freqChar / totalChar; - if (r >= 1.0f) - r = 0.99f; - return r; - } - return 0.01f; - } - - public override void Reset() - { - state = ProbingState.Detecting; - lastOrder = 255; - for (int i = 0; i < NUMBER_OF_SEQ_CAT; i++) - seqCounters[i] = 0; - totalSeqs = 0; - totalChar = 0; - freqChar = 0; - } - - public override string GetCharsetName() - { - return (nameProber == null) ? model.CharsetName - : nameProber.GetCharsetName(); - } - - } -} |