public void IfCanSeekIsFalseLengthAndPositionShouldNotBeCalled()
{
var baseStream = new DelegateStream(
canReadFunc: () => true,
canSeekFunc: () => false,
readFunc: (buffer, offset, count) => 0);
var trackingStream = new CallTrackingStream(baseStream);
var dest = Stream.Null;
trackingStream.CopyTo(dest);
var times = trackingStream.TimesCalled(nameof(trackingStream.CanSeek));
Assert.True(times >= 0 && times <= 1);
Assert.AreEqual(0, trackingStream.TimesCalled(nameof(trackingStream.Length)));
Assert.AreEqual(0, trackingStream.TimesCalled(nameof(trackingStream.Position)));
// We can't override CopyTo since it's not virtual, so checking TimesCalled
// for CopyTo will result in 0. Instead, we check that Read was called,
// and validate the parameters passed there.
Assert.AreEqual(1, trackingStream.TimesCalled(nameof(trackingStream.Read)));
byte[] outerBuffer = trackingStream.ReadBuffer;
int outerOffset = trackingStream.ReadOffset;
int outerCount = trackingStream.ReadCount;
Assert.NotNull(outerBuffer);
Assert.True(outerOffset >= 0 && outerOffset <= (outerBuffer.Length - outerCount));
Assert.True(outerCount >= 1 && outerCount <= int.MaxValue); // the buffer can't be size 0
}
public void AsyncIfCanSeekIsFalseLengthAndPositionShouldNotBeCalled()
{
var baseStream = new DelegateStream(
canReadFunc: () => true,
canSeekFunc: () => false,
readFunc: (buffer, offset, count) => 0);
var trackingStream = new CallTrackingStream(baseStream);
var dest = Stream.Null;
trackingStream.CopyTo(dest);
var times = trackingStream.TimesCalled(nameof(trackingStream.CanSeek));
Assert.True(times >= 0 && times <= 1);
Assert.AreEqual(0, trackingStream.TimesCalled(nameof(trackingStream.Length)));
Assert.AreEqual(0, trackingStream.TimesCalled(nameof(trackingStream.Position)));
}
public void AsyncIfCanSeekIsTrueLengthAndPositionShouldOnlyBeCalledOnce()
{
var baseStream = new DelegateStream(
canReadFunc: () => true,
canSeekFunc: () => true,
readFunc: (buffer, offset, count) => 0,
lengthFunc: () => 0L,
positionGetFunc: () => 0L);
var trackingStream = new CallTrackingStream(baseStream);
var dest = Stream.Null;
trackingStream.CopyTo(dest);
var times = trackingStream.TimesCalled(nameof(trackingStream.Length));
Assert.True(times >= 0 && times <= 1);
times = trackingStream.TimesCalled(nameof(trackingStream.Position));
Assert.True(times >= 0 && times <= 1);
}
public void IfLengthIsLessThanOrEqualToPositionCopyToShouldStillBeCalledWithAPositiveBufferSize()
{
var data = LengthIsLessThanOrEqualToPosition();
foreach (var item in data)
{
long length = (long)item[0];
long position = (long)item[1];
// Streams with their Lengths <= their Positions, e.g.
// new MemoryStream { Position = 3 }.SetLength(1)
// should still be called CopyTo{Async} on with a
// bufferSize of at least 1.
var baseStream = new DelegateStream(
canReadFunc: () => true,
canSeekFunc: () => true,
lengthFunc: () => length,
positionGetFunc: () => position,
readFunc: (buffer, offset, count) => 0);
var trackingStream = new CallTrackingStream(baseStream);
var dest = Stream.Null;
trackingStream.CopyTo(dest);
// CopyTo is not virtual, so we can't override it in
// CallTrackingStream and record the arguments directly.
// Instead, validate the arguments passed to Read.
Assert.AreEqual(1, trackingStream.TimesCalled(nameof(trackingStream.Read)));
byte[] outerBuffer = trackingStream.ReadBuffer;
int outerOffset = trackingStream.ReadOffset;
int outerCount = trackingStream.ReadCount;
Assert.NotNull(outerBuffer);
Assert.True(outerOffset >= 0 && outerOffset <= (outerBuffer.Length - outerCount));
Assert.True(outerCount >= 1 && outerCount <= int.MaxValue);
}
}
public void IfLengthMinusPositionPositiveOverflowsBufferSizeShouldStillBePositive()
{
var data = LengthMinusPositionPositiveOverflows();
foreach (var item in data)
{
long length = (long)item[0];
long position = (long)item[1];
// The new implementation of Stream.CopyTo calculates the bytes left
// in the Stream by calling Length - Position. This can overflow to a
// negative number, so this tests that if that happens we don't send
// in a negative bufferSize.
var baseStream = new DelegateStream(
canReadFunc: () => true,
canSeekFunc: () => true,
lengthFunc: () => length,
positionGetFunc: () => position,
readFunc: (buffer, offset, count) => 0);
var trackingStream = new CallTrackingStream(baseStream);
var dest = Stream.Null;
trackingStream.CopyTo(dest);
// CopyTo is not virtual, so we can't override it in
// CallTrackingStream and record the arguments directly.
// Instead, validate the arguments passed to Read.
Assert.AreEqual(1, trackingStream.TimesCalled(nameof(trackingStream.Read)));
byte[] outerBuffer = trackingStream.ReadBuffer;
int outerOffset = trackingStream.ReadOffset;
int outerCount = trackingStream.ReadCount;
Assert.NotNull(outerBuffer);
Assert.True(outerOffset >= 0 && outerOffset <= (outerBuffer.Length - outerCount));
Assert.True(outerCount >= 1 && outerCount <= int.MaxValue);
}
}
public void IfLengthIsGreaterThanPositionAndDoesNotOverflowEverythingShouldGoNormally()
{
const int ReadLimit = 7;
var data = LengthIsGreaterThanPositionAndDoesNotOverflow();
foreach (var item in data)
{
long length = (long)item[0];
long position = (long)item[1];
// Lambda state
byte[] outerBuffer = null;
int? outerOffset = null;
int? outerCount = null;
int readsLeft = ReadLimit;
var srcBase = new DelegateStream(
canReadFunc: () => true,
canSeekFunc: () => true,
lengthFunc: () => length,
positionGetFunc: () => position,
readFunc: (buffer, offset, count) =>
{
Assert.NotNull(buffer);
Assert.True(offset >= 0 && offset <= (buffer.Length - count));
Assert.True(count >= 1 && count <= int.MaxValue);
// CopyTo should always pass in the same buffer/offset/count
if (outerBuffer != null)
{
Assert.AreDeepEqual(outerBuffer, buffer);
}
else
{
outerBuffer = buffer;
}
if (outerOffset != null)
{
Assert.AreEqual(outerOffset, offset);
}
else
{
outerOffset = offset;
}
if (outerCount != null)
{
Assert.AreEqual(outerCount, count);
}
else
{
outerCount = count;
}
return(--readsLeft); // CopyTo will call Read on this ReadLimit times before stopping
});
var src = new CallTrackingStream(srcBase);
var destBase = new DelegateStream(
canWriteFunc: () => true,
writeFunc: (buffer, offset, count) =>
{
Assert.AreDeepEqual(outerBuffer, buffer);
Assert.AreEqual(outerOffset, offset);
Assert.AreEqual(readsLeft, count);
});
var dest = new CallTrackingStream(destBase);
src.CopyTo(dest);
Assert.AreEqual(ReadLimit, src.TimesCalled(nameof(src.Read)));
Assert.AreEqual(ReadLimit - 1, dest.TimesCalled(nameof(dest.Write)));
}
}