GifRecorder/Encoding/LZWEncoder.cs

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#region Java Disclaimer
//  Adapted from Jef Poskanzer's Java port by way of J. M. G. Elliott.
//  K Weiner 12/00
#endregion

#region C Disclaimer

// GIFCOMPR.C       - GIF Image compression routines
//
// Lempel-Ziv compression based on 'compress'.  GIF modifications by
// David Rowley (mgardi@watdcsu.waterloo.edu)

// GIF Image compression - modified 'compress'
//
// Based on: compress.c - File compression ala IEEE Computer, June 1984.
//
// By Authors:  Spencer W. Thomas      (decvax!harpo!utah-cs!utah-gr!thomas)
//              Jim McKie              (decvax!mcvax!jim)
//              Steve Davies           (decvax!vax135!petsd!peora!srd)
//              Ken Turkowski          (decvax!decwrl!turtlevax!ken)
//              James A. Woods         (decvax!ihnp4!ames!jaw)
//              Joe Orost              (decvax!vax135!petsd!joe)

#endregion

using System;
using System.IO;

namespace ScreenToGif.Encoding
{
    /// <summary>
    /// Image compression routines.
    /// </summary>
    public class LzwEncoder
    {
        #region Variables

        /// <summary>
        /// End of File.
        /// </summary>
        private const int Eof = -1;

        private readonly int _imgW;
        private readonly int _imgH;
        private readonly byte[] _pixAry;
        private readonly int _initCodeSize;
        private int _remaining;
        private int _curPixel;

        private const int Bits = 12;

        /// <summary>
        /// 80% occupancy.
        /// </summary>
        private const int HSize = 5003;

        /// <summary>
        /// Number of bits/code.
        /// </summary>
        int _numBits;