using System;

using System.IO;

using System.IO.Compression;

using System.Text;

using Microsoft.IO;

public class Program

{

    private static readonly RecyclableMemoryStreamManager StreamManager = new();

    private const string TokenVersion = "v2|";

    public static void Main()

    {

        try

        {

            string encodedContinuationToken = "";

            byte[] continuationTokenBytes = Convert.FromBase64String(encodedContinuationToken);

​

            try

            {

                using MemoryStream memoryStream = StreamManager.GetStream("ContinuationTokenConverter", continuationTokenBytes, 0, continuationTokenBytes.Length);

                using var deflate = new DeflateStream(memoryStream, CompressionMode.Decompress);

                using var reader = new StreamReader(deflate, Encoding.UTF8);

​

                var token = reader.ReadToEnd();

                if (token?.StartsWith(TokenVersion, StringComparison.Ordinal) == true)

                {

                    Console.WriteLine(token.Substring(TokenVersion.Length));

                }

​

                Console.WriteLine(Encoding.UTF8.GetString(continuationTokenBytes));

            }

            catch (InvalidDataException)

            {

                // Fall back to compatibility with non-compressed tokens

                Console.WriteLine(Encoding.UTF8.GetString(continuationTokenBytes));

            }

        }

        catch (FormatException)

        {

            Console.WriteLine("InvalidContinuationToken");

        }

    }

}