Fan.Sys.Buf.fromBase64 C# (CSharp) Méthode

        public static Buf fromBase64(string s)
        {
            int slen = s.Length;
              int si = 0;
              int max = slen * 6 / 8;
              byte[] buf = new byte[max];
              int size = 0;

              while (si < slen)
              {
            int n = 0;
            int v = 0;
            for (int j=0; j<4 && si<slen;)
            {
              int ch = s[si++];
              int c = ch < 128 ? base64inv[ch] : -1;
              if (c >= 0)
              {
            n |= c << (18 - j++ * 6);
            if (ch != '=') v++;
              }
            }

            if (v > 1) buf[size++] = (byte)(n >> 16);
            if (v > 2) buf[size++] = (byte)(n >> 8);
            if (v > 3) buf[size++] = (byte)n;
              }

              return new MemBuf(buf, size);
        }