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// Copyright (c) All contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System;
using System.Buffers;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading;
using Nerdbank.Streams;
using Xunit;
using Xunit.Abstractions;
namespace MessagePack.Tests
{
public class MessagePackWriterTests
{
private readonly ITestOutputHelper logger;
#if !UNITY_2018_3_OR_NEWER
public MessagePackWriterTests(ITestOutputHelper logger)
{
this.logger = logger;
}
#else
public MessagePackWriterTests()
{
this.logger = new NullTestOutputHelper();
}
#endif
/// <summary>
/// Verifies that <see cref="MessagePackWriter.WriteRaw(ReadOnlySpan{byte})"/>
/// accepts a span that came from stackalloc.
/// </summary>
[Fact]
public unsafe void WriteRaw_StackAllocatedSpan()
{
var sequence = new Sequence<byte>();
var writer = new MessagePackWriter(sequence);
Span<byte> bytes = stackalloc byte[8];
bytes[0] = 1;
bytes[7] = 2;
fixed (byte* pBytes = bytes)
{
var flexSpan = new Span<byte>(pBytes, bytes.Length);
writer.WriteRaw(flexSpan);
}
writer.Flush();
var written = sequence.AsReadOnlySequence.ToArray();
Assert.Equal(1, written[0]);
Assert.Equal(2, written[7]);
}
[Fact]
public void Write_ByteArray_null()
{
var sequence = new Sequence<byte>();
var writer = new MessagePackWriter(sequence);
writer.Write((byte[])null);
writer.Flush();
var reader = new MessagePackReader(sequence.AsReadOnlySequence);
Assert.True(reader.TryReadNil());
}
[Fact]
public void Write_ByteArray()
{
var sequence = new Sequence<byte>();
var writer = new MessagePackWriter(sequence);
var buffer = new byte[] { 1, 2, 3 };
writer.Write(buffer);
writer.Flush();
var reader = new MessagePackReader(sequence.AsReadOnlySequence);
Assert.Equal(buffer, reader.ReadBytes().Value.ToArray());
}
[Fact]
public void Write_String_null()
{
var sequence = new Sequence<byte>();
var writer = new MessagePackWriter(sequence);
writer.Write((string)null);
writer.Flush();
var reader = new MessagePackReader(sequence.AsReadOnlySequence);
Assert.True(reader.TryReadNil());
}
[Fact]
public void Write_String()
{
var sequence = new Sequence<byte>();
var writer = new MessagePackWriter(sequence);
string expected = "hello";
writer.Write(expected);
writer.Flush();
var reader = new MessagePackReader(sequence.AsReadOnlySequence);
Assert.Equal(expected, reader.ReadString());
}
[Fact]
public void Write_String_MultibyteChars()
{
var sequence = new Sequence<byte>();
var writer = new MessagePackWriter(sequence);
writer.Write(TestConstants.MultibyteCharString);
writer.Flush();
this.logger.WriteLine("Written bytes: [{0}]", string.Join(", ", sequence.AsReadOnlySequence.ToArray().Select(b => string.Format(CultureInfo.InvariantCulture, "0x{0:x2}", b))));
Assert.Equal(TestConstants.MsgPackEncodedMultibyteCharString.ToArray(), sequence.AsReadOnlySequence.ToArray());
}
[Fact]
public void WriteStringHeader()
{
var sequence = new Sequence<byte>();
var writer = new MessagePackWriter(sequence);
byte[] strBytes = Encoding.UTF8.GetBytes("hello");
writer.WriteStringHeader(strBytes.Length);
writer.WriteRaw(strBytes);
writer.Flush();
var reader = new MessagePackReader(sequence);
Assert.Equal("hello", reader.ReadString());
}
[Fact]
public void WriteBinHeader()
{
var sequence = new Sequence<byte>();
var writer = new MessagePackWriter(sequence);
writer.WriteBinHeader(5);
writer.WriteRaw(new byte[] { 1, 2, 3, 4, 5 });
writer.Flush();
var reader = new MessagePackReader(sequence);
Assert.Equal(new byte[] { 1, 2, 3, 4, 5 }, reader.ReadBytes().Value.ToArray());
}
[Fact]
public void WriteExtensionFormatHeader_NegativeExtension()
{
var sequence = new Sequence<byte>();
var writer = new MessagePackWriter(sequence);
var header = new ExtensionHeader(-1, 10);
writer.WriteExtensionFormatHeader(header);
writer.WriteRaw(new byte[10]);
writer.Flush();
var written = sequence.AsReadOnlySequence;
var reader = new MessagePackReader(written);
var readHeader = reader.ReadExtensionFormatHeader();
Assert.Equal(header.TypeCode, readHeader.TypeCode);
Assert.Equal(header.Length, readHeader.Length);
}
[Fact]
public void CancellationToken()
{
var sequence = new Sequence<byte>();
var writer = new MessagePackWriter(sequence);
Assert.False(writer.CancellationToken.CanBeCanceled);
var cts = new CancellationTokenSource();
writer.CancellationToken = cts.Token;
Assert.Equal(cts.Token, writer.CancellationToken);
}
[Fact]
public void TryWriteWithBuggyWriter()
{
Assert.Throws<InvalidOperationException>(() =>
{
var writer = new MessagePackWriter(new BuggyBufferWriter());
writer.WriteRaw(new byte[10]);
});
}
/// <summary>
/// Besides being effectively a no-op, this <see cref="IBufferWriter{T}"/>
/// is buggy because it can return empty arrays, which should never happen.
/// A sizeHint=0 means give me whatever memory is available, but should never be empty.
/// </summary>
private class BuggyBufferWriter : IBufferWriter<byte>
{
public void Advance(int count)
{
}
public Memory<byte> GetMemory(int sizeHint = 0) => new byte[sizeHint];
public Span<byte> GetSpan(int sizeHint = 0) => new byte[sizeHint];
}
}
}
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