public static VhdFooter CreateFixedDiskFooter(long virtualSize)
{
var helper = new AttributeHelper <VhdFooter>();
var footer = new VhdFooter();
var reservedAttribute = helper.GetAttribute(() => footer.Reserved);
footer.Cookie = VhdCookie.CreateFooterCookie();
footer.Features = VhdFeature.Reserved;
footer.FileFormatVersion = VhdFileFormatVersion.DefaultFileFormatVersion;
footer.HeaderOffset = VhdConstants.VHD_NO_DATA_LONG;
footer.TimeStamp = DateTime.UtcNow;
footer.CreatorApplication = WindowsAzureCreatorApplicationName;
footer.CreatorVersion = VhdCreatorVersion.CSUP2011;
footer.CreatorHostOsType = HostOsType.Windows;
footer.PhsyicalSize = virtualSize;
footer.VirtualSize = virtualSize;
footer.DiskGeometry = DiskGeometry.CreateFromVirtualSize(virtualSize);
footer.DiskType = DiskType.Fixed;
footer.UniqueId = Guid.NewGuid();
footer.SavedState = false;
footer.Reserved = new byte[reservedAttribute.Size];
var footerSerializer = new VhdFooterSerializer(footer);
var byteArray = footerSerializer.ToByteArray();
using (var memoryStream = new MemoryStream(byteArray))
{
var binaryReader = new BinaryReader(memoryStream);
var vhdDataReader = new VhdDataReader(binaryReader);
var footerFactory = new VhdFooterFactory(vhdDataReader);
var vhdFooter = footerFactory.CreateFooter();
return(vhdFooter);
}
}
public static void CreateFixedVhdFile(Stream destination, long virtualSize)
{
var footer = VhdFooterFactory.CreateFixedDiskFooter(virtualSize);
var serializer = new VhdFooterSerializer(footer);
var buffer = serializer.ToByteArray();
destination.SetLength(virtualSize + VhdConstants.VHD_FOOTER_SIZE);
destination.Seek(-VhdConstants.VHD_FOOTER_SIZE, SeekOrigin.End);
destination.Write(buffer, 0, buffer.Length);
destination.Flush();
}
private static IEnumerable <CompletionPort> CreateFixedVhdFileAtAsync(AsyncMachine machine, Stream destination, long virtualSize)
{
var footer = VhdFooterFactory.CreateFixedDiskFooter(virtualSize);
var serializer = new VhdFooterSerializer(footer);
var buffer = serializer.ToByteArray();
destination.SetLength(virtualSize + VhdConstants.VHD_FOOTER_SIZE);
destination.Seek(-VhdConstants.VHD_FOOTER_SIZE, SeekOrigin.End);
destination.BeginWrite(buffer, 0, buffer.Length, machine.CompletionCallback, null);
yield return(CompletionPort.SingleOperation);
destination.EndWrite(machine.CompletionResult);
destination.Flush();
}
private VhdFile Create(StreamSource streamSource)
{
var disposer = new Action(() => { if (streamSource.DisposeOnException)
{
streamSource.Stream.Dispose();
}
});
bool throwing = false;
try
{
var reader = new BinaryReader(streamSource.Stream, Encoding.Unicode);
var dataReader = new VhdDataReader(reader);
var footer = new VhdFooterFactory(dataReader).CreateFooter();
VhdHeader header = null;
BlockAllocationTable blockAllocationTable = null;
VhdFile parent = null;
if (footer.DiskType != DiskType.Fixed)
{
header = new VhdHeaderFactory(dataReader, footer).CreateHeader();
blockAllocationTable = new BlockAllocationTableFactory(dataReader, header).Create();
if (footer.DiskType == DiskType.Differencing)
{
string parentPath = GetParentPath(streamSource.VhdDirectory, header);
parent = Create(parentPath);
}
}
return(new VhdFile(footer, header, blockAllocationTable, parent, streamSource.Stream));
}
catch (Exception e)
{
throwing = true;
throw new VhdParsingException("unsupported format", e);
}
finally
{
if (throwing)
{
disposer();
}
}
}
