public async Task TestCompositeStream()
{
const int LineCount = 100;
var ms = new MemoryStream();
var cs = new CircularStream();
var task = Task.Run(() =>
{
using (var stream = cs.CreateReaderView())
{
return(SHA1.Create().ComputeHash(stream));
}
});
byte[] expected;
using (var ds = new CompositeStream(ms, cs.CreateWriterView()))
{
var sw = new StreamWriter(ds);
for (int i = 0; i < LineCount; i++)
{
sw.WriteLine($"Line {i}: test!");
}
sw.Flush();
expected = SHA1.Create().ComputeHash(ms.ToArray());
}
Assert.Equal(expected, await task);
}
public void TestCircularStream()
{
const int LineCount = 100;
var cs = new CircularStream();
Task.Run(() =>
{
using (var writer = cs.CreateWriterView())
using (var sw = new StreamWriter(writer))
{
for (int i = 0; i < LineCount; i++)
{
sw.WriteLine($"Line {i}: test!");
}
}
});
using (var reader = cs.CreateReaderView())
using (var sr = new StreamReader(reader))
{
for (int i = 0; i < LineCount; i++)
{
Assert.Equal($"Line {i}: test!", sr.ReadLine());
}
Assert.Equal(string.Empty, sr.ReadToEnd());
}
}
public static Stream WithSha256Hash(this Stream stream, out Task <byte[]> hashTask)
{
var cs = new CircularStream();
hashTask = Task.Run(() =>
{
using var csr = cs.CreateReaderView();
return(HashUtility.GetSha256Hash(csr));
});
return(new CompositeStream(stream, cs.CreateWriterView()));
}
public static Stream WithMd5Hash(this Stream stream, out Task <byte[]> hashTask)
{
var cs = new CircularStream();
hashTask = Task.Run(() =>
{
using var csr = cs.CreateReaderView();
return(MD5.Create().ComputeHash(csr));
});
return(new CompositeStream(stream, cs.CreateWriterView()));
}