/// <summary>
/// Initializes a stream as a fixed-sized VDI file.
/// </summary>
/// <param name="stream">The stream to initialize.</param>
/// <param name="ownsStream">Indicates if the new instance controls the lifetime of the stream.</param>
/// <param name="capacity">The desired capacity of the new disk</param>
/// <returns>An object that accesses the stream as a VDI file</returns>
public static DiskImageFile InitializeFixed(Stream stream, Ownership ownsStream, long capacity)
{
PreHeaderRecord preHeader = PreHeaderRecord.Initialized();
HeaderRecord header = HeaderRecord.Initialized(ImageType.Fixed, ImageFlags.None, capacity, 1024 * 1024, 0);
byte[] blockTable = new byte[header.BlockCount * 4];
for (int i = 0; i < header.BlockCount; ++i)
{
Utilities.WriteBytesLittleEndian((uint)i, blockTable, i * 4);
}
header.BlocksAllocated = header.BlockCount;
stream.Position = 0;
preHeader.Write(stream);
header.Write(stream);
stream.Position = header.BlocksOffset;
stream.Write(blockTable, 0, blockTable.Length);
long totalSize = header.DataOffset + ((long)header.BlockSize * (long)header.BlockCount);
if (stream.Length < totalSize)
{
stream.SetLength(totalSize);
}
return(new DiskImageFile(stream, ownsStream));
}
/// <summary>
/// Initializes a stream as a dynamically-sized VDI file.
/// </summary>
/// <param name="stream">The stream to initialize.</param>
/// <param name="ownsStream">Indicates if the new instance controls the lifetime of the stream.</param>
/// <param name="capacity">The desired capacity of the new disk</param>
/// <returns>An object that accesses the stream as a VDI file</returns>
public static DiskImageFile InitializeDynamic(Stream stream, Ownership ownsStream, long capacity)
{
PreHeaderRecord preHeader = PreHeaderRecord.Initialized();
HeaderRecord header = HeaderRecord.Initialized(ImageType.Dynamic, ImageFlags.None, capacity, 1024 * 1024, 0);
byte[] blockTable = new byte[header.BlockCount * 4];
for (int i = 0; i < blockTable.Length; ++i)
{
blockTable[i] = 0xFF;
}
header.BlocksAllocated = 0;
stream.Position = 0;
preHeader.Write(stream);
header.Write(stream);
stream.Position = header.BlocksOffset;
stream.Write(blockTable, 0, blockTable.Length);
return(new DiskImageFile(stream, ownsStream));
}
