public void MakeSureYouCannotCreateVirtualDiskFromGarbage()
{
MemoryStream testStream = new MemoryStream();
testStream.Write(new byte[2048], 0, 2048);
ExceptionAssert.MakeSureExceptionIsRaisedBy <VirtualDiskCreationFailedException>(delegate()
{
VirtualDisk.CreateFromStream(testStream);
});
}
public void MakeSureVirtualDisksCorrectlyInitializeThemselvesFromSuitableStreams()
{
VirtualDiskWithItsStream virtualDiskConstructionResult = VirtualDiskTestFactory.ConstructDefaultTestDiskWithStream();
var virtualDisk = virtualDiskConstructionResult.Disk;
Assert.AreEqual(VirtualDiskTestFactory.DefaultDiskBlockSize, virtualDisk.BlockSizeInBytes);
Assert.AreEqual(VirtualDiskTestFactory.DefaultDiskSize, virtualDisk.DiskSizeInBytes);
VirtualDisk diskRecreatedFromTheSameStream = VirtualDisk.CreateFromStream(virtualDiskConstructionResult.BackingStream);
Assert.AreEqual(virtualDisk.BlockSizeInBytes, diskRecreatedFromTheSameStream.BlockSizeInBytes);
Assert.AreEqual(VirtualDiskTestFactory.DefaultDiskSize, diskRecreatedFromTheSameStream.DiskSizeInBytes);
}
public static VirtualFileSystem CreateFileSystemFromExistingStream(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
VirtualDisk disk = VirtualDisk.CreateFromStream(stream);
var diskStructuresManager = new FileSystemNodeStorage(disk);
FileSystemHeader header = diskStructuresManager.ReadFileSystemHeader(VirtualDiskFormatter.FileSystemHeaderBlockIndex);
var nameValidator = FileSystemArtifactNamesValidator.Default;
var pathValidator = PathValidator.Default;
var pathBuilder = PathBuilder.Default;
var nodeResolver = new NodeResolver(disk, diskStructuresManager, StringComparer.OrdinalIgnoreCase, header.RootBlockOffset, VirtualFileSystem.Root, VirtualFileSystem.DirectorySeparatorChar, pathValidator, pathBuilder);
return(VirtualFileSystem.CreateFromDisk(disk, StringComparer.OrdinalIgnoreCase, nodeResolver, pathBuilder, nameValidator, pathValidator));
}
// Note: этот код специально прилеплен к и без того немаленькому VirtualFileSystem. Это повышает discoverability фабричных методов (по сравнению с выделением фабрики) и усиливает ограничения (private-конструктор против internal-конструктора).
/// <summary>
/// Создает виртуальную файловую систему с настройками по умолчанию, на основе указанного файла.
/// </summary>
/// <param name="fullPathForFile"></param>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="FileSystemCreationFailedException"></exception>
public static VirtualFileSystem OpenExisting(string fullPathForFile)
{
if (String.IsNullOrEmpty(fullPathForFile))
{
throw new ArgumentNullException("fullPathForFile");
}
FileStream stream = CreateStreamFromExistingFileWrappingExceptions(fullPathForFile);
try
{
VirtualDisk disk = VirtualDisk.CreateFromStream(stream);
var diskStructuresManager = new FileSystemNodeStorage(disk);
FileSystemHeader header = diskStructuresManager.ReadFileSystemHeader(VirtualDiskFormatter.FileSystemHeaderBlockIndex);
var nameValidator = FileSystemArtifactNamesValidator.Default;
var pathValidator = PathValidator.Default;
var pathBuilder = PathBuilder.Default;
var nodeResolver = new NodeResolver(disk, diskStructuresManager, StringComparer.OrdinalIgnoreCase, header.RootBlockOffset, VirtualFileSystem.Root, VirtualFileSystem.DirectorySeparatorChar, pathValidator, pathBuilder);
return(VirtualFileSystem.CreateFromDisk(disk, StringComparer.OrdinalIgnoreCase, nodeResolver, pathBuilder, nameValidator, pathValidator));
}
catch (VirtualDiskCreationFailedException exception)
{
throw CreateGenericSystemCreationFromExistingFileException(exception, fullPathForFile);
}
catch (InconsistentDataDetectedException exception)
{
throw CreateGenericSystemCreationFromExistingFileException(exception, fullPathForFile);
}
}
