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using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Xunit;
namespace Jellyfin.Extensions.Tests;
public class StreamExtensionsTests
{
[Fact]
public async Task IsStreamIdenticalAsync_SeekableDifferentLengths_ReturnsFalse()
{
var cancellationToken = TestContext.Current.CancellationToken;
await using var a = new MemoryStream(new byte[] { 1, 2, 3 });
await using var b = new MemoryStream(new byte[] { 1, 2, 3, 4 });
var result = await a.IsStreamIdenticalAsync(b, cancellationToken);
Assert.False(result);
}
[Fact]
public async Task IsStreamIdenticalAsync_NonSeekableIdenticalStreams_ReturnsTrue()
{
var cancellationToken = TestContext.Current.CancellationToken;
await using var a = new NonSeekableReadStream(new byte[] { 1, 2, 3, 4 });
await using var b = new NonSeekableReadStream(new byte[] { 1, 2, 3, 4 });
var result = await a.IsStreamIdenticalAsync(b, cancellationToken);
Assert.True(result);
}
[Fact]
public async Task IsStreamIdenticalAsync_NonSeekableDifferentStreams_ReturnsFalse()
{
var cancellationToken = TestContext.Current.CancellationToken;
await using var a = new NonSeekableReadStream(new byte[] { 1, 2, 3, 4 });
await using var b = new NonSeekableReadStream(new byte[] { 1, 2, 9, 4 });
var result = await a.IsStreamIdenticalAsync(b, cancellationToken);
Assert.False(result);
}
[Fact]
public async Task IsFileIdenticalAsync_NonSeekableStream_ThrowsArgumentException()
{
var cancellationToken = TestContext.Current.CancellationToken;
var path = Path.Join(Path.GetTempPath(), Path.GetRandomFileName());
await File.WriteAllBytesAsync(path, new byte[] { 1, 2, 3, 4 }, cancellationToken);
try
{
await using var stream = new NonSeekableReadStream(new byte[] { 1, 2, 3, 4 });
await Assert.ThrowsAsync<ArgumentException>(async () =>
await stream.IsFileIdenticalAsync(path, cancellationToken));
}
finally
{
File.Delete(path);
}
}
// Both publiclyVisible values are exercised so the test runs once under the fast path
// (TryGetBuffer succeeds) and once under the slow path (TryGetBuffer returns false).
[Theory]
[InlineData(true)]
[InlineData(false)]
public async Task IsFileIdenticalAsync_UsesStartOfStreamAndRestoresPosition_OnMatch(bool publiclyVisible)
{
var cancellationToken = TestContext.Current.CancellationToken;
var path = Path.Join(Path.GetTempPath(), Path.GetRandomFileName());
var bytes = new byte[] { 10, 20, 30, 40, 50 };
await File.WriteAllBytesAsync(path, bytes, cancellationToken);
try
{
await using var stream = CreateMemoryStream(bytes, publiclyVisible);
stream.Position = 3;
var result = await stream.IsFileIdenticalAsync(path, cancellationToken);
Assert.True(result);
Assert.Equal(3, stream.Position);
}
finally
{
File.Delete(path);
}
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public async Task IsFileIdenticalAsync_RestoresPosition_OnMismatch(bool publiclyVisible)
{
var cancellationToken = TestContext.Current.CancellationToken;
var path = Path.Join(Path.GetTempPath(), Path.GetRandomFileName());
await File.WriteAllBytesAsync(path, new byte[] { 10, 20, 30, 40, 99 }, cancellationToken);
try
{
await using var stream = CreateMemoryStream(new byte[] { 10, 20, 30, 40, 50 }, publiclyVisible);
stream.Position = 2;
var result = await stream.IsFileIdenticalAsync(path, cancellationToken);
Assert.False(result);
Assert.Equal(2, stream.Position);
}
finally
{
File.Delete(path);
}
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public async Task IsStreamIdenticalAsync_BothMemoryStreams_NonZeroPositions_SeeksToStart(bool publiclyVisible)
{
var cancellationToken = TestContext.Current.CancellationToken;
await using var a = CreateMemoryStream(new byte[] { 1, 2, 3, 4, 5 }, publiclyVisible);
await using var b = CreateMemoryStream(new byte[] { 1, 2, 3, 4, 5 }, publiclyVisible);
a.Position = 3;
b.Position = 1;
var result = await a.IsStreamIdenticalAsync(b, cancellationToken);
Assert.True(result);
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public async Task IsStreamIdenticalAsync_MemoryStreamPairedWithSeekableNonMemoryStream_NonZeroPositions_SeeksToStart(bool publiclyVisible)
{
var cancellationToken = TestContext.Current.CancellationToken;
await using var a = CreateMemoryStream(new byte[] { 1, 2, 3, 4 }, publiclyVisible);
await using var b = new SeekableNonMemoryStream(new byte[] { 1, 2, 3, 4 });
a.Position = 2;
b.Position = 3;
var result = await a.IsStreamIdenticalAsync(b, cancellationToken);
Assert.True(result);
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public async Task IsStreamIdenticalAsync_NonMemoryStreamPairedWithMemoryStream_Swaps_ReturnsTrue(bool publiclyVisible)
{
var cancellationToken = TestContext.Current.CancellationToken;
await using var a = new SeekableNonMemoryStream(new byte[] { 1, 2, 3, 4 });
await using var b = CreateMemoryStream(new byte[] { 1, 2, 3, 4 }, publiclyVisible);
var result = await a.IsStreamIdenticalAsync(b, cancellationToken);
Assert.True(result);
}
[Fact]
public async Task IsStreamIdenticalAsync_BothSeekableNonMemoryStreams_NonZeroPositions_SeeksToStart()
{
var cancellationToken = TestContext.Current.CancellationToken;
await using var a = new SeekableNonMemoryStream(new byte[] { 1, 2, 3, 4 });
await using var b = new SeekableNonMemoryStream(new byte[] { 1, 2, 3, 4 });
a.Position = 1;
b.Position = 2;
var result = await a.IsStreamIdenticalAsync(b, cancellationToken);
Assert.True(result);
}
[Fact]
public async Task IsStreamIdenticalAsync_NonSeekableShortReads_Identical_ReturnsTrue()
{
var cancellationToken = TestContext.Current.CancellationToken;
var data = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
await using var a = new ShortReadingNonSeekableStream(data, maxReadSize: 3);
await using var b = new ShortReadingNonSeekableStream(data, maxReadSize: 5);
var result = await a.IsStreamIdenticalAsync(b, cancellationToken);
Assert.True(result);
}
[Fact]
public async Task IsStreamIdenticalAsync_NonSeekableShortReads_DifferentLengths_ReturnsFalse()
{
var cancellationToken = TestContext.Current.CancellationToken;
await using var a = new ShortReadingNonSeekableStream(new byte[] { 1, 2, 3, 4 }, maxReadSize: 3);
await using var b = new ShortReadingNonSeekableStream(new byte[] { 1, 2, 3, 4, 5 }, maxReadSize: 5);
var result = await a.IsStreamIdenticalAsync(b, cancellationToken);
Assert.False(result);
}
private static MemoryStream CreateMemoryStream(byte[] data, bool publiclyVisible)
=> publiclyVisible
? new MemoryStream(data, 0, data.Length, writable: false, publiclyVisible: true)
: new MemoryStream(data);
private sealed class NonSeekableReadStream : Stream
{
private readonly Stream _inner;
public NonSeekableReadStream(byte[] data)
{
_inner = new MemoryStream(data, writable: false);
}
public override bool CanRead => true;
public override bool CanSeek => false;
public override bool CanWrite => false;
public override long Length => throw new NotSupportedException();
public override long Position
{
get => throw new NotSupportedException();
set => throw new NotSupportedException();
}
public override void Flush()
{
}
public override int Read(byte[] buffer, int offset, int count)
=> _inner.Read(buffer, offset, count);
public override ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
=> _inner.ReadAsync(buffer, cancellationToken);
public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
=> _inner.ReadAsync(buffer.AsMemory(offset, count), cancellationToken).AsTask();
public override long Seek(long offset, SeekOrigin origin)
=> throw new NotSupportedException();
public override void SetLength(long value)
=> throw new NotSupportedException();
public override void Write(byte[] buffer, int offset, int count)
=> throw new NotSupportedException();
protected override void Dispose(bool disposing)
{
if (disposing)
{
_inner.Dispose();
}
base.Dispose(disposing);
}
public override async ValueTask DisposeAsync()
{
await _inner.DisposeAsync();
await base.DisposeAsync();
}
}
private sealed class SeekableNonMemoryStream : Stream
{
private readonly MemoryStream _inner;
public SeekableNonMemoryStream(byte[] data)
{
_inner = new MemoryStream(data, writable: false);
}
public override bool CanRead => true;
public override bool CanSeek => true;
public override bool CanWrite => false;
public override long Length => _inner.Length;
public override long Position
{
get => _inner.Position;
set => _inner.Position = value;
}
public override void Flush()
{
}
public override int Read(byte[] buffer, int offset, int count)
=> _inner.Read(buffer, offset, count);
public override ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
=> _inner.ReadAsync(buffer, cancellationToken);
public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
=> _inner.ReadAsync(buffer.AsMemory(offset, count), cancellationToken).AsTask();
public override long Seek(long offset, SeekOrigin origin)
=> _inner.Seek(offset, origin);
public override void SetLength(long value)
=> throw new NotSupportedException();
public override void Write(byte[] buffer, int offset, int count)
=> throw new NotSupportedException();
protected override void Dispose(bool disposing)
{
if (disposing)
{
_inner.Dispose();
}
base.Dispose(disposing);
}
public override async ValueTask DisposeAsync()
{
await _inner.DisposeAsync();
await base.DisposeAsync();
}
}
private sealed class ShortReadingNonSeekableStream : Stream
{
private readonly Stream _inner;
private readonly int _maxReadSize;
public ShortReadingNonSeekableStream(byte[] data, int maxReadSize)
{
_inner = new MemoryStream(data, writable: false);
_maxReadSize = maxReadSize;
}
public override bool CanRead => true;
public override bool CanSeek => false;
public override bool CanWrite => false;
public override long Length => throw new NotSupportedException();
public override long Position
{
get => throw new NotSupportedException();
set => throw new NotSupportedException();
}
public override void Flush()
{
}
public override int Read(byte[] buffer, int offset, int count)
=> _inner.Read(buffer, offset, Math.Min(count, _maxReadSize));
public override ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
=> _inner.ReadAsync(buffer[..Math.Min(buffer.Length, _maxReadSize)], cancellationToken);
public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
=> _inner.ReadAsync(buffer.AsMemory(offset, Math.Min(count, _maxReadSize)), cancellationToken).AsTask();
public override long Seek(long offset, SeekOrigin origin)
=> throw new NotSupportedException();
public override void SetLength(long value)
=> throw new NotSupportedException();
public override void Write(byte[] buffer, int offset, int count)
=> throw new NotSupportedException();
protected override void Dispose(bool disposing)
{
if (disposing)
{
_inner.Dispose();
}
base.Dispose(disposing);
}
public override async ValueTask DisposeAsync()
{
await _inner.DisposeAsync();
await base.DisposeAsync();
}
}
}
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