下载地址转换工具代码

因为我有时候下H片是迅雷的地址而我又不是迅雷会员，无法离线下载。我QQ旋风又可以离线下载，于是乎在网上搜了一下参考代码，写了一个转换器。以后下H片就不怕不怕拉。

using System;
using System.Collections.Generic;
using System.Text;

namespace DownloadConvert
{
    public class ConvertClass
    {
        public ConvertClass()
        {
 
        }

        /// <summary>
        /// 下载地址转换方法
        /// </summary>
        /// <param name="ZHLX">转换类型</param>
        /// <param name="In_Address">输入地址</param>
        /// <returns></returns>
        public static string ConvertStr(string ZHLX,string In_Address)
        {
            string Out_Address = "";//存储输出地址
            int index = In_Address.Trim().ToLower().LastIndexOf("/");
            string StrTo = In_Address.ToLower();

            if(StrTo.StartsWith("thunder://"))//如果当前输入下载地址是迅雷下载地址
            {
                byte[] output = { };
                output = Convert.FromBase64String(In_Address.Substring(index +1));
                string str = Encoding.Default.GetString(output);
                string strSub = str.Substring(2,str.Length - 4);
                switch(ZHLX)
                {
                    case "普通HTTP":
                        Out_Address = strSub;
                        break;
                    case "迅雷地址":
                        Out_Address = In_Address;
                        break;
                    case "旋风地址":
                        byte[] byte_XF = Encoding.Default.GetBytes(strSub);
                        Out_Address = "qqdl://" + Convert.ToBase64String(byte_XF);
                        break;
                    case "快车地址":
                        string App = "[FLASHGET]" + strSub + "[FLASHGET]";
                        byte[] byte_KC = Encoding.Default.GetBytes(App);
                        Out_Address = "flashget://" + Convert.ToBase64String(byte_KC) + "&JiangZheng711";
                        break;

                }
            }
            else if (StrTo.StartsWith("qqdl://"))
            {
                byte[] output = { };
                output = Convert.FromBase64String(In_Address.Substring(index + 1));
                string str = Encoding.Default.GetString(output);
                switch (ZHLX)
                {
                    case "普通HTTP":
                        Out_Address = str;
                        break;
                    case "迅雷地址":
                        string App = "AA" + str + "ZZ";
                        byte[] bytes_XL = Encoding.Default.GetBytes(App);
                        Out_Address = "thunder://" + Convert.ToBase64String(bytes_XL);
                        break;
                    case "旋风地址":
                        Out_Address = In_Address;
                        break;
                    case "快车地址":
                        string AppStr = "[FLASHGET]" + str + "[FLASHGET]";
                        byte[] byte_KC = Encoding.Default.GetBytes(AppStr);
                        Out_Address = "flashget://" + Convert.ToBase64String(byte_KC) + "&JiangZheng711";
                        break;
                }
            }
            else if (StrTo.StartsWith("flashget://"))
            {
                byte[] outputb = { };
                int FlashSpe = In_Address.Trim().IndexOf("&");              
                outputb = Convert.FromBase64String(In_Address.Trim().Substring(index + 1, FlashSpe - "flashget://".Length));
                string str = Encoding.Default.GetString(outputb);
                int indexS = str.IndexOf("]");
                int indexE = str.LastIndexOf("[");
                string strSub = str.Substring(indexS + 1, indexE - indexS - 1);

                switch (ZHLX)
                {
                    case "普通HTTP":
                        Out_Address = strSub;
                        break;
                    case "迅雷地址":
                        string App = "AA" + str + "ZZ";
                        byte[] bytes_XL = Encoding.Default.GetBytes(App);
                        Out_Address = "thunder://" + Convert.ToBase64String(bytes_XL);
                        break;
                    case "快车地址":
                        Out_Address = In_Address;
                        break;
                    case "旋风地址":
                        byte[] byte_XF = Encoding.Default.GetBytes(strSub);
                        Out_Address = "qqdl://" + Convert.ToBase64String(byte_XF);
                        break;
                }
            }
            else
            {
                switch (ZHLX)
                {
                    case "普通HTTP":
                        Out_Address = In_Address;
                        break;
                    case "迅雷地址":
                        string App = "AA" + In_Address + "ZZ";
                        byte[] bytes_XL = Encoding.Default.GetBytes(App);
                        Out_Address = "thunder://" + Convert.ToBase64String(bytes_XL);
                        break;
                    case "快车地址":
                        string AppS = "[FLASHGET]" + In_Address + "[FLASHGET]";
                        byte[] byte_KC = Encoding.Default.GetBytes(AppS);
                        Out_Address = "flashget://" + Convert.ToBase64String(byte_KC) + "&JiangZheng711";
                        break;
                    case "旋风地址":
                        byte[] byte_XF = Encoding.Default.GetBytes(In_Address);
                        Out_Address = "qqdl://" + Convert.ToBase64String(byte_XF);
                        break;
                }
            }
            return Out_Address;
        }
    }
}

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