58 lines
1.7 KiB
C#
58 lines
1.7 KiB
C#
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using System;
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namespace Tesses.YouTubeDownloader
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{
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internal static class B64
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{
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public static string Base64UrlEncodes(string arg)
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{
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return Base64UrlEncode(System.Text.Encoding.UTF8.GetBytes(arg));
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}
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public static string Base64Encode(byte[] arg)
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{
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return Convert.ToBase64String(arg);
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}
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public static byte[] Base64Decode(string arg)
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{
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return Convert.FromBase64String(arg);
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}
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public static string Base64Encodes(string arg)
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{
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return Base64Encode(System.Text.Encoding.UTF8.GetBytes(arg));
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}
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public static string Base64UrlEncode(byte[] arg)
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{
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string s = Convert.ToBase64String(arg); // Regular base64 encoder
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s = s.Split('=')[0]; // Remove any trailing '='s
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s = s.Replace('+', '-'); // 62nd char of encoding
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s = s.Replace('/', '_'); // 63rd char of encoding
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return s;
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}
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public static string Base64Decodes(string arg)
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{
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return System.Text.Encoding.UTF8.GetString(Base64Decode(arg));
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}
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public static string Base64UrlDecodes(string arg)
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{
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return System.Text.Encoding.UTF8.GetString(Base64UrlDecode(arg));
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}
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public static byte[] Base64UrlDecode(string arg)
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{
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string s = arg;
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s = s.Replace('-', '+'); // 62nd char of encoding
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s = s.Replace('_', '/'); // 63rd char of encoding
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switch (s.Length % 4) // Pad with trailing '='s
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{
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case 0: break; // No pad chars in this case
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case 2: s += "=="; break; // Two pad chars
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case 3: s += "="; break; // One pad char
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default: throw new System.Exception(
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"Illegal base64url string!");
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}
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return Convert.FromBase64String(s); // Standard base64 decoder
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}
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}
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}
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