public void TestAccessBackingBytes()
{
var backingBytes = new byte[100];
using (var buffer = new ByteArrayBuffer(backingBytes, 10, 80, false))
{
var segment = buffer.AccessBackingBytes(20);
Assert.AreSame(backingBytes, segment.Array);
Assert.AreEqual(30, segment.Offset);
Assert.AreEqual(60, segment.Count);
}
}
public async Task ReadBytesAsync_with_byte_buffer_should_have_expected_effect_for_partial_reads(int testCase, int[] partition)
{
var bytes = new byte[] { 1, 2, 3 };
var stream = Substitute.For<Stream>();
var destination = new ByteArrayBuffer(new byte[3], 3);
var n = 0;
var p = 0;
stream.ReadAsync(Arg.Any<byte[]>(), Arg.Any<int>(), Arg.Any<int>(), Arg.Any<CancellationToken>()).Returns(x =>
{
var l = partition[n++];
var b = (byte[])x[0];
var o = (int)x[1];
Buffer.BlockCopy(bytes, p, b, o, l);
p += l;
return Task.FromResult(l);
});
await stream.ReadBytesAsync(destination, 0, 3, CancellationToken.None);
destination.AccessBackingBytes(0).Array.Should().Equal(bytes);
}
public async Task ReadBytesAsync_with_byte_buffer_should_have_expected_effect_for_offset(int offset, byte[] expectedBytes)
{
var bytes = new byte[] { 1 };
var stream = new MemoryStream(bytes);
var destination = new ByteArrayBuffer(new byte[3]);
await stream.ReadBytesAsync(destination, offset, 1, CancellationToken.None);
destination.AccessBackingBytes(0).Array.Should().Equal(expectedBytes);
}
public async Task ReadBytesAsync_with_byte_buffer_should_have_expected_effect_for_partial_reads(int testCase, int[] partition)
{
var bytes = new byte[] { 1, 2, 3 };
var mockStream = new Mock<Stream>();
var destination = new ByteArrayBuffer(new byte[3], 3);
var n = 0;
var position = 0;
mockStream.Setup(s => s.ReadAsync(It.IsAny<byte[]>(), It.IsAny<int>(), It.IsAny<int>(), It.IsAny<CancellationToken>()))
.Returns((byte[] buffer, int offset, int count, CancellationToken cancellationToken) =>
{
var length = partition[n++];
Buffer.BlockCopy(bytes, position, buffer, offset, length);
position += length;
return Task.FromResult(length);
});
await mockStream.Object.ReadBytesAsync(destination, 0, 3, CancellationToken.None);
destination.AccessBackingBytes(0).Array.Should().Equal(bytes);
}