Elight.Utility/Files/ICOGen/IconDir.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Text;

namespace Elight.Utility.Files.ICOGen
{
    public class IconDir
    {
        private ushort idReserved = 0;
        private ushort idType = 1;
        private ushort idCount = 1;
        private IList<IconDirentry> identries = new List<IconDirentry>();
        public IconDir()
        {
        }
        public IconDir(string iconFile)
        {
            FileStream fileStream = new FileStream(iconFile, FileMode.Open);
            byte[] iconData = new byte[fileStream.Length];
            fileStream.Read(iconData, 0, iconData.Length);
            fileStream.Close();
            LoadData(iconData);
        }
        /// <summary>
        /// 读取ICO
        /// </summary>
        /// <param name="iconData"></param>
        private void LoadData(byte[] iconData)
        {
            idReserved = BitConverter.ToUInt16(iconData, 0);
            idType = BitConverter.ToUInt16(iconData, 2);
            idCount = BitConverter.ToUInt16(iconData, 4);
            if (idType != 1 || idReserved != 0) return;
            int readIndex = 6;
            for (ushort i = 0; i != idCount; i++)
            {
                identries.Add(new IconDirentry(iconData, ref readIndex));
            }

        }

        /// <summary>
        /// 保存ICO
        /// </summary>
        /// <param name="fileName"></param>
        public Stream SaveData()
        {
            byte[] retByte;
            if (ImageCount == 0) return null;
            MemoryStream memoryStream = new MemoryStream();
            byte[] temp = BitConverter.GetBytes(idReserved);
            memoryStream.Write(temp, 0, temp.Length);
            temp = BitConverter.GetBytes(idType);
            memoryStream.Write(temp, 0, temp.Length);
            temp = BitConverter.GetBytes((ushort)ImageCount);
            memoryStream.Write(temp, 0, temp.Length);
            for (int i = 0; i != ImageCount; i++)