private IEnumerable <CompletionPort> CreateAsync(AsyncMachine <VhdFile> machine, StreamSource streamSource)
{
var disposer = new Action(() => { if (streamSource.DisposeOnException)
{
streamSource.Stream.Dispose();
}
});
var reader = TryCatch(() => new BinaryReader(streamSource.Stream, Encoding.Unicode), disposer);
var dataReader = TryCatch(() => new VhdDataReader(reader), disposer);
var footerFactory = TryCatch(() => new VhdFooterFactory(dataReader), disposer);
footerFactory.BeginCreateFooter(machine.CompletionCallback, null);
yield return(CompletionPort.SingleOperation);
var footer = TryCatch <VhdFooter>(footerFactory.EndCreateFooter, disposer, machine.CompletionResult);
VhdHeader header = null;
BlockAllocationTable blockAllocationTable = null;
VhdFile parent = null;
if (footer.DiskType != DiskType.Fixed)
{
var headerFactory = new VhdHeaderFactory(dataReader, footer);
headerFactory.BeginCreateHeader(machine.CompletionCallback, null);
yield return(CompletionPort.SingleOperation);
header = TryCatch <VhdHeader>(headerFactory.EndCreateHeader, disposer, machine.CompletionResult);
var tableFactory = new BlockAllocationTableFactory(dataReader, header);
tableFactory.BeginCreate(machine.CompletionCallback, null);
yield return(CompletionPort.SingleOperation);
blockAllocationTable = TryCatch <BlockAllocationTable>(tableFactory.EndCreate, disposer, machine.CompletionResult);
if (footer.DiskType == DiskType.Differencing)
{
var parentPath = streamSource.VhdDirectory == null ? header.ParentPath : Path.Combine(streamSource.VhdDirectory, header.GetRelativeParentPath());
BeginCreate(parentPath, machine.CompletionCallback, null);
yield return(CompletionPort.SingleOperation);
parent = TryCatch <VhdFile>(EndCreate, disposer, machine.CompletionResult);
}
}
machine.ParameterValue = new VhdFile(footer, header, blockAllocationTable, parent, streamSource.Stream);
}
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();
}
}
}