jellyfin/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/SequenceModel.cs

/* ***** 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
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 * decision by deleting the provisions above and replace them with the notice
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 * 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 abstract class SequenceModel
    {
        // [256] table use to find a char's order
        protected byte[] charToOrderMap;

        // [SAMPLE_SIZE][SAMPLE_SIZE] table to find a 2-char sequence's
        // frequency
        protected byte[] precedenceMatrix;

        // freqSeqs / totalSeqs
        protected float typicalPositiveRatio;
        
        public float TypicalPositiveRatio => typicalPositiveRatio;

        // not used            
        protected bool keepEnglishLetter;
        
        public bool KeepEnglishLetter => keepEnglishLetter;

        protected string charsetName;

        public string CharsetName => charsetName;

        public SequenceModel(
                byte[] charToOrderMap,
                byte[] precedenceMatrix,
                float typicalPositiveRatio,
                bool keepEnglishLetter,
                string charsetName)
        {
            this.charToOrderMap = charToOrderMap;
            this.precedenceMatrix = precedenceMatrix;
            this.typicalPositiveRatio = typicalPositiveRatio;
            this.keepEnglishLetter = keepEnglishLetter;
            this.charsetName = charsetName;
        }

        public byte GetOrder(byte b)
        {
            return charToOrderMap[b];
        }

        public byte GetPrecedence(int pos)
        {
            return precedenceMatrix[pos];
        }

    }
}