public static byte[] DecodePngFile(string encoded)
{
encoded = encoded.Substring($"{OfficeDrawIoPayloadPrexix}:".Length);
var encoder = new BasE91();
var pngBytes = encoder.Decode(encoded).ToArray();
return(pngBytes);
}
public static string EncodePngFile(string path)
{
var pngBytes = FileReadAllBytes(path);
var encoder = new BasE91();
var pngEncoded = encoder.Encode(pngBytes).ToString();
var encoded = $"{OfficeDrawIoPayloadPrexix}:{pngEncoded}";
return(encoded);
}