jellyfin-server/Emby.Server.Implementations/TextEncoding/UniversalDetector/CharsetDetector.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
 * 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.IO;

namespace UniversalDetector
{
    /// <summary>
    /// Default implementation of charset detection interface.
    /// The detector can be fed by a System.IO.Stream:
    /// <example>
    /// <code>
    /// using (FileStream fs = File.OpenRead(filename)) {
    ///    CharsetDetector cdet = new CharsetDetector();
    ///    cdet.Feed(fs);
    ///    cdet.DataEnd();
    ///    Console.WriteLine("{0}, {1}", cdet.Charset, cdet.Confidence);
    /// </code>
    /// </example>
    ///
    ///  or by a byte a array:
    ///
    /// <example>
    /// <code>
    /// byte[] buff = new byte[1024];
    /// int read;
    /// while ((read = stream.Read(buff, 0, buff.Length)) > 0 && !done)
    ///     Feed(buff, 0, read);
    /// cdet.DataEnd();
    /// Console.WriteLine("{0}, {1}", cdet.Charset, cdet.Confidence);
    /// </code>
    /// </example>
    /// </summary>
    public class CharsetDetector : Core.UniversalDetector, ICharsetDetector
    {
        private string charset;

        private float confidence;

        //public event DetectorFinished Finished;

        public CharsetDetector() : base(FILTER_ALL)
        {

        }

        public void Feed(Stream stream)
        {
            byte[] buff = new byte[1024];
            int read;
            while ((read = stream.Read(buff, 0, buff.Length)) > 0 && !done)
            {
                Feed(buff, 0, read);
            }
        }

        public bool IsDone()
        {
            return done;
        }

        public override void Reset()
        {
            this.charset = null;
            this.confidence = 0.0f;
            base.Reset();
        }

        public string Charset => charset;

        public float Confidence => confidence;

        protected override void Report(string charset, float confidence)
        {
            this.charset = charset;
            this.confidence = confidence;
            //            if (Finished != null) {
            //                Finished(charset, confidence);
            //            }
        }
    }

    //public delegate void DetectorFinished(string charset, float confidence);

}