public static HeaderRecord Initialized(ImageType type, ImageFlags flags, long size, int blockSize, int blockExtra)
{
HeaderRecord result = new HeaderRecord();
result._fileVersion = new FileVersion(0x00010001);
result.HeaderSize = 400;
result.ImageType = type;
result.Flags = flags;
result.Comment = "Created by .NET DiscUtils";
result.LegacyGeometry = new GeometryRecord();
result.DiskSize = size;
result.BlockSize = blockSize;
result.BlockExtraSize = blockExtra;
result.BlockCount = (int)((size + blockSize - 1) / blockSize);
result.BlocksAllocated = 0;
result.BlocksOffset = ((PreHeaderRecord.Size + result.HeaderSize + 511) / 512) * 512;
result.DataOffset = (uint)(((result.BlocksOffset + result.BlockCount * 4 + 511) / 512) * 512);
result.UniqueId = Guid.NewGuid();
result.ModificationId = Guid.NewGuid();
result.LChsGeometry = new GeometryRecord();
return result;
}
public DiskStream(Stream fileStream, Ownership ownsStream, HeaderRecord fileHeader)
{
_fileStream = fileStream;
_fileHeader = fileHeader;
_ownsStream = ownsStream;
ReadBlockTable();
}
/// <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));
}
private void ReadHeader()
{
_stream.Position = 0;
_preHeader = new PreHeaderRecord();
_preHeader.Read(_stream);
_header = new HeaderRecord();
_header.Read(_preHeader.Version, _stream);
}
