public void TryExpandingTheStreamViaSetLengthAndThenWritingReadingFromIt()
{
DataStreamReadableWritable dataStream = TestCollaboratorsFactory.CreateEmptyDataStream();
const int testArrayLength = 500000;
dataStream.SetLength(testArrayLength);
Assert.AreEqual(testArrayLength, dataStream.Length);
Assert.AreEqual(0, dataStream.Position);
const int halfTestArray = testArrayLength / 2; //на половине пути запишем что-нибудь интересное.
dataStream.SetPosition(halfTestArray);
var bytesToWrite = new byte[halfTestArray];
for (int i = 0; i < bytesToWrite.Length; i++)
{
bytesToWrite[i] = 231;
}
dataStream.Write(bytesToWrite, 0, bytesToWrite.Length);
dataStream.SetPosition(halfTestArray);
var bytesRead = new byte[bytesToWrite.Length];
dataStream.Read(bytesRead, 0, bytesRead.Length);
MakeSureEachByteInArrayIsRight(bytesRead, 231); // и проверим, что записалось что нужно, - новый объем как будто проработан.
}
public void TryChangingPositionCombinedWithWritingAndReading()
{
DataStreamReadableWritable dataStream = TestCollaboratorsFactory.CreateEmptyDataStream();
byte[] bytes = ByteBufferFactory.CreateByteBufferWithAllBytesSet(123, 123);
dataStream.Write(bytes, 0, bytes.Length);
dataStream.SetPosition(0);
byte[] bytes2 = ByteBufferFactory.CreateByteBufferWithAllBytesSet(14, 77);
dataStream.Write(bytes2, 0, bytes2.Length);
var bytesRead = new byte[dataStream.Length];
dataStream.SetPosition(0);
dataStream.Read(bytesRead, 0, dataStream.Length);
for (int i = 0; i < dataStream.Length; i++)
{
if (i <= 13)
{
Assert.AreEqual(77, bytesRead[i]);
}
else
{
Assert.AreEqual(123, bytesRead[i]);
}
}
}
public void MakeSureReadDoesNotThrowIfReadingBeyondTheStream()
{
DataStreamReadableWritable dataStream = TestCollaboratorsFactory.CreateEmptyDataStream();
byte[] bytes = ByteBufferFactory.CreateByteBufferWithAllBytesSet(55000, 123);
dataStream.Write(bytes, 0, bytes.Length);
dataStream.SetPosition(55000 - 35);
var largeArray = new byte[2000];
Assert.AreEqual(35, dataStream.Read(largeArray, 0, 2000));
}
private void ShrinkAndMakeSureDataIsIntact(DataStreamReadableWritable dataStream, int newLength)
{
dataStream.SetLength(newLength);
Assert.AreEqual(newLength, dataStream.Length);
dataStream.SetPosition(0);
byte[] bytesRead = new byte[newLength];
dataStream.Read(bytesRead, 0, bytesRead.Length);
for (int i = 0; i < newLength; i++)
{
Assert.AreEqual(bytesRead[i], (byte)(i / 10000));
}
}
public void MakeSureShrinkingFreesDiskSpace()
{
var testCollaborators = TestCollaboratorsFactory.CreateCollaboratorsForTestingDataStreams();
DataStreamReadableWritable dataStream =
testCollaborators.VirtualFileSystem.OpenFileForWriting(testCollaborators.FileInfo.FullPath);
int valueCloseToDiskSize = (int)testCollaborators.Disk.DiskSizeInBytes - 25 * testCollaborators.Disk.BlockSizeInBytes;
dataStream.SetLength(valueCloseToDiskSize);
var fileSystem = testCollaborators.VirtualFileSystem;
FileInfo newFileNode = fileSystem.CreateFile(@"\testFile2");
DataStreamReadableWritable newFileNodeStream = fileSystem.OpenFileForWriting(newFileNode.FullPath);
ExceptionAssert.MakeSureExceptionIsRaisedBy <InsufficientSpaceException>(
delegate
{
newFileNodeStream.SetLength(valueCloseToDiskSize);
});
dataStream.SetLength(0);
newFileNodeStream.SetLength(valueCloseToDiskSize);
dataStream.SetPosition(0);
const int answeringToAllQuestionsByte = 42;
byte[] bytesToWrite = ByteBufferFactory.CreateByteBufferWithAllBytesSet(valueCloseToDiskSize, answeringToAllQuestionsByte);
newFileNodeStream.Write(bytesToWrite, 0, bytesToWrite.Length);
newFileNodeStream.SetPosition(0);
var buffer = new byte[valueCloseToDiskSize];
newFileNodeStream.Read(buffer, 0, buffer.Length);
MakeSureEachByteInArrayIsRight(buffer, answeringToAllQuestionsByte);
}
private void TryWritingAndReadingBackSpecifiedByteArrays(byte[] testArray)
{
DataStreamReadableWritable dataStream = TestCollaboratorsFactory.CreateEmptyDataStream();
Assert.AreEqual(0, dataStream.Position);
Assert.AreEqual(0, dataStream.Length);
dataStream.Write(testArray, 0, testArray.Length);
Assert.AreEqual(testArray.Length, dataStream.Position);
Assert.AreEqual(testArray.Length, dataStream.Length);
var bytesRead = new byte[testArray.Length];
Assert.AreEqual(0, dataStream.Read(bytesRead, 0, testArray.Length)); // позиция в DataStream = testArray.Length; Прочитать ничего не получится.
dataStream.SetPosition(0);
dataStream.Read(bytesRead, 0, testArray.Length);
CollectionAssert.AreEqual(testArray, bytesRead);
}
public void TryReadingAndWritingPortionsOfDataByteByByte()
{
DataStreamReadableWritable dataStream = TestCollaboratorsFactory.CreateEmptyDataStream();
var stream = new MemoryStream();
var binaryWriter = new BinaryWriter(stream);
const int numberOfIntegersToTest = 2561;
for (int i = 0; i < numberOfIntegersToTest; i++)
{
binaryWriter.Write(i);
}
byte[] bytes = stream.ToArray();
for (int i = 0; i < bytes.Length; i++)
{
dataStream.Write(new byte[] { bytes[i] }, 0, 1);
}
dataStream.SetPosition(0);
var bytesRead = new byte[dataStream.Length];
dataStream.Read(bytesRead, 0, dataStream.Length);
var readingStream = new MemoryStream(bytesRead, false);
var reader = new BinaryReader(readingStream);
for (int i = 0; i < numberOfIntegersToTest; i++)
{
int number = reader.ReadInt32();
Assert.AreEqual(i, number);
}
}
public override void SetPosition(int newPosition)
{
_dataStream.SetPosition(newPosition);
}
