迅雷，快车旋风链接编码解码C#源代码

在做一个项目时，有要求用到下载工具下载，于是上网找了找，找到了这些链接的加密规则，自己写了几个转换方法

写的有点急，可能不太完善，若您在使用中发现问题，烦请留言给我指出，谢谢！ 

using System;
using System.Text;
/*
 * Author:小火柴https://dabao.me
 * Desc:迅雷，快车，旋风链接编码解码
 */

namespace Base64Url
{
    class Program
    {
        #region 静态常量
        /// <summary>迅雷 thunder://</summary>
        public const string _thunder = "Thunder://";
        /// <summary>快车 flashget://</summary>
        public const string _flashget = "Flashget://";
        /// <summary>QQ旋风 qqdl://</summary>
        public const string _qqdl = "Qqdl://";
        #endregion

        static void Main(string[] args)
        {
            string url = "";
            url = "thunder://QUFmdHA6Ly82OjZAZnRwLjY2eXMub3JnOjQ1MDgv44CQ6L+F6Zu35LiL6L29d3d3LmR5MTMxLmNvbeOAkVjmiJjorabliY3kvKDvvJrph5HliJrni7xCROS4reiLseWPjOWtlzEyODDpq5jmuIUucm12Ylpa";
            //url = "Flashget://W0ZMQVNIR0VUXWh0dHA6Ly9ibG9nLnhpYW9odW9jaGFpLm5ldFtGTEFTSEdFVF0=&xiaohuochai";
            //url="Qqdl://aHR0cDovL2Jsb2cueGlhb2h1b2NoYWkubmV0";
            string url2 = "https://dabao.me";
            string thunder = "";
            string flashget = "";
            string qqdl = "";

            //编码
            thunder = EncodeUrlToBase64(url2, LinkType.Thunder);
            flashget = EncodeUrlToBase64(url2, LinkType.Flashget);
            qqdl = EncodeUrlToBase64(url2, LinkType.Qqdl);
            Console.Write(thunder + "\r\n" + flashget + "\r\n" + qqdl + "\r\n");

            //解码
            string result = "您输入的地址可能不是迅雷，快车，旋风中的任何一种！";
            if (url.StartsWith(_thunder, true, null))//迅雷
                result = DecodeUrlFromBase64(url.Remove(0, _thunder.Length), LinkType.Thunder);
            if (url.StartsWith(_flashget, true, null))//快车
                result = DecodeUrlFromBase64(url.Remove(0, _flashget.Length), LinkType.Flashget);
            if (url.StartsWith(_qqdl, true, null))//QQ旋风
                result = DecodeUrlFromBase64(url.Remove(0, _qqdl.Length), LinkType.Qqdl);
            Console.Write(result);
            Console.ReadLine();
        }

        #region 编码&解码
        #region 编码
        /// <summary>
        /// 编码URL
        /// </summary>
        /// <param name="url">原生URL</param>
        protected static string EncodeUrlToBase64(string url, LinkType linktype)
        {
            string enurl = "";
            string tempUrl = "";
            switch (linktype)
            {
                case LinkType.Thunder:
                    tempUrl = "AA" + url + "ZZ";
                    enurl = _thunder + EnCodeUrl(tempUrl);
                    break;
                case LinkType.Flashget:
                    tempUrl = "[FLASHGET]" + url + "[FLASHGET]";
                    enurl = _flashget + EnCodeUrl(tempUrl) + "&xiaohuochai";//&后为用户自定义信息，具体什么用还不清楚
                    break;
                case LinkType.Qqdl:
                    enurl = _qqdl + EnCodeUrl(url);
                    break;
                default:
                    break;
            }
            return enurl;
        }

        private static string EnCodeUrl(string tempUrl)
        {
            byte[] bytes; string enurl;
            bytes = Encoding.Default.GetBytes(tempUrl);
            enurl = Convert.ToBase64String(bytes);
            return enurl;
        }

        #endregion

        #region 解码
        /// <summary>
        /// 链接解码
        /// </summary>
        /// <param name="baseurl">链接</param>
        protected static string DecodeUrlFromBase64(string baseurl, LinkType linktype)
        {
            string deurl = "";
            switch (linktype)
            {
                case LinkType.Thunder:
                    deurl = DecodeUrl(baseurl);
                    deurl = deurl.Remove(0, 2);
                    deurl = deurl.Remove(deurl.Length - 2);
                    break;
                case LinkType.Flashget:
                    deurl = DecodeUrl(baseurl.Remove(baseurl.LastIndexOf('&')));
                    deurl = deurl.Remove(0, 10);
                    deurl = deurl.Remove(deurl.Length - 10);
                    break;
                case LinkType.Qqdl:
                    deurl = DecodeUrl(baseurl);
                    break;
                default:
                    break;
            }
            return deurl;
        }

        private static string DecodeUrl(string baseurl)
        {
            byte[] bytes;
            string deurl;
            bytes = Convert.FromBase64String(baseurl);
            deurl = Encoding.UTF8.GetString(bytes);
            return deurl;
        }
        #endregion
        #endregion
    }
    /// <summary>
    /// 链接类型
    /// </summary>
    enum LinkType
    {
        /// <summary>迅雷</summary>        
        Thunder,
        /// <summary>快车</summary>
        Flashget,
        /// <summary>QQ旋风</summary>
        Qqdl
    }
}