哔哩哔哩 BV、AV互转 C#版

Edie ·

更新时间:2024-11-15

· 569 次阅读

哔哩哔哩 BV、AV互转 C#版

从JAVA移植的（从python移植的B站AV号BV号互转算法源码）//套娃

引用@ty1937

https://blog.csdn.net/ty1937/article/details/105080093?

在这里插入图片描述


		private static string table = "fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF";
		private static Dictionary b2aDic = new Dictionary();
		private static Dictionary a2bDic = new Dictionary();
		static int[] ss = { 11, 10, 3, 8, 4, 6, 2, 9, 5, 7 };
		static Int64 xor = 177451812;
		static Int64 add = 8728348608L;
		/// 
		/// 泡我（依赖性）
		/// 
		/// 英文字母的第一个字母
		/// 英文字母的第二个字幕
		/// 想要的结果（废话）
		public static long Power(int a, int b)
		{
			Int64 power = 1;
			for (int i = 0; i < b; i++)
			{
				power *= a;
			}
			return power;
		}
		/// 
		/// BV号转av号
		/// 
		/// 带有BV前缀的编号
		/// 带有小写av前缀的编号
		public static string BV2AV(string str)
		{
			try
			{
				str = str.Trim();
				b2aDic.Clear();
				Int64 r = 0;
				for (int i = 0; i < 58; i++)
				{
					string s1 = table.Substring(i, 1);
					b2aDic.Add(s1, i);
				}
				for (int i = 0; i < 6; i++)
				{
					r = r + b2aDic[str.Substring(ss[i], 1)] * Power(58, i);
				}
				return "av" + ((r - add) ^ xor);
			}
			catch (Exception ex)
			{
				//MessageBox.Show(ex.ToString());
				return "Error";
				throw;
			}
		}
		/// 
		/// av号转BV号
		/// 
		/// 带有小写av前缀的编号
		/// 带有大写BV前缀的编号
		public static  string AV2BV(string str)
		{
			try
			{
				str = str.Trim();
				a2bDic.Clear();
				string[] strs = { "av" };
				string[] sss = (str.Split(strs, StringSplitOptions.RemoveEmptyEntries));
				Int64 s = Convert.ToInt64(sss[0]);
				StringBuilder sb = new StringBuilder("BV1  4 1 7  ");
				s = (s ^ xor) + add;
				for (int i = 0; i < 58; i++)
				{
					string s1 = table.Substring(i, 1);
					a2bDic.Add(i, s1);
				}
				for (int i = 0; i < 6; i++)
				{
					string r = a2bDic[(s / Power(58, i) % 58)];
					int index = Convert.ToInt32(ss[i].ToString());
					for (int j = 0; j < sb.Length; j++)
					{
						sb[index] = r.ToCharArray()[0];
					}
				}
				return sb.ToString();
			}
			catch (Exception ex)
			{
				//MessageBox.Show(ex.ToString());
				return "Error";
				throw;
			}
		}

花了点时间从python移植过来的JAVA移植过来的（套娃）。
java的substring和replace和C#的重载略不同
两个方法依赖Power方法，此为静态工具类在这里插入图片描述