using System;

using System.Buffers;

using System.Linq;

using Microsoft.IO;

​

public class Program

{

    public static void Main()

    {

        const int length = 150000;

        var manager = new RecyclableMemoryStreamManager();

        using var stream1 = CreateNewStream();

        using var stream2 = CreateNewStream();

        Console.WriteLine("Sequence.SequenceEquals: {0}", stream1.GetReadOnlySequence().SequenceEqual(stream2.GetReadOnlySequence()));

        Console.WriteLine("Span.SequenceEquals: {0}", stream1.GetSpan(length).SequenceEqual(stream2.GetSpan(length)));

​

        RecyclableMemoryStream CreateNewStream()

        {

            var stream = manager.GetStream(Guid.NewGuid());

            var data = Enumerable.Repeat(byte.MaxValue, length).ToArray();

            stream.Write(data, 0, data.Length);

            return stream;

        }

    }

}

​

public static class ReadOnlySequenceExtension

{

    public static bool SequenceEqual(this ReadOnlySequence<byte> left, ReadOnlySequence<byte> right)

    {

        if (left.Length != right.Length)

            return false;

​

        var leftReader = new SequenceReader<byte>(left);

        var rightReader = new SequenceReader<byte>(right);

​

        while (leftReader.Remaining > 0 && rightReader.Remaining > 0)

        {

            if (leftReader.CurrentSpan.Length != rightReader.CurrentSpan.Length)

            {

                return false;

            }

​

            if (!leftReader.CurrentSpan.SequenceEqual(rightReader.CurrentSpan))

            {

                return false;

            }

​

            leftReader.Advance(leftReader.CurrentSpan.Length);

            rightReader.Advance(leftReader.CurrentSpan.Length);

        }

​

        return true;

    }

}