public int ReadFrom(byte[] buffer, int offset)
{
Array.Copy(buffer, offset, _data, 0, FixedSize);
Signature = Utilities.ToUInt32LittleEndian(_data, 0);
Checksum = Utilities.ToUInt32LittleEndian(_data, 4);
EntryCount = Utilities.ToUInt32LittleEndian(_data, 8);
Reserved = Utilities.ToUInt32LittleEndian(_data, 12);
Regions = new Dictionary <Guid, RegionEntry>();
if (IsValid)
{
for (int i = 0; i < EntryCount; ++i)
{
RegionEntry entry = Utilities.ToStruct <RegionEntry>(_data, 16 + 32 * i);
Regions.Add(entry.Guid, entry);
}
}
return(Size);
}
private static void InitializeDynamicInternal(Stream stream, long capacity, long blockSize)
{
if (blockSize < Sizes.OneMiB || blockSize > Sizes.OneMiB * 256 || !Utilities.IsPowerOfTwo(blockSize))
{
throw new ArgumentOutOfRangeException("blockSize", blockSize, "BlockSize must be a power of 2 between 1MB and 256MB");
}
int logicalSectorSize = 512;
int physicalSectorSize = 4096;
long chunkRatio = (0x800000L * logicalSectorSize) / blockSize;
long dataBlocksCount = Utilities.Ceil(capacity, blockSize);
long sectorBitmapBlocksCount = Utilities.Ceil(dataBlocksCount, chunkRatio);
long totalBatEntriesDynamic = dataBlocksCount + ((dataBlocksCount - 1) / chunkRatio);
FileHeader fileHeader = new FileHeader()
{
Creator = ".NET DiscUtils"
};
long fileEnd = Sizes.OneMiB;
VhdxHeader header1 = new VhdxHeader();
header1.SequenceNumber = 0;
header1.FileWriteGuid = Guid.NewGuid();
header1.DataWriteGuid = Guid.NewGuid();
header1.LogGuid = Guid.Empty;
header1.LogVersion = 0;
header1.Version = 1;
header1.LogLength = (uint)Sizes.OneMiB;
header1.LogOffset = (ulong)fileEnd;
header1.CalcChecksum();
fileEnd += header1.LogLength;
VhdxHeader header2 = new VhdxHeader(header1);
header2.SequenceNumber = 1;
header2.CalcChecksum();
RegionTable regionTable = new RegionTable();
RegionEntry metadataRegion = new RegionEntry();
metadataRegion.Guid = RegionEntry.MetadataRegionGuid;
metadataRegion.FileOffset = fileEnd;
metadataRegion.Length = (uint)Sizes.OneMiB;
metadataRegion.Flags = RegionFlags.Required;
regionTable.Regions.Add(metadataRegion.Guid, metadataRegion);
fileEnd += metadataRegion.Length;
RegionEntry batRegion = new RegionEntry();
batRegion.Guid = RegionEntry.BatGuid;
batRegion.FileOffset = 3 * Sizes.OneMiB;
batRegion.Length = (uint)Utilities.RoundUp(totalBatEntriesDynamic * 8, Sizes.OneMiB);
batRegion.Flags = RegionFlags.Required;
regionTable.Regions.Add(batRegion.Guid, batRegion);
fileEnd += batRegion.Length;
stream.Position = 0;
Utilities.WriteStruct(stream, fileHeader);
stream.Position = 64 * Sizes.OneKiB;
Utilities.WriteStruct(stream, header1);
stream.Position = 128 * Sizes.OneKiB;
Utilities.WriteStruct(stream, header2);
stream.Position = 192 * Sizes.OneKiB;
Utilities.WriteStruct(stream, regionTable);
stream.Position = 256 * Sizes.OneKiB;
Utilities.WriteStruct(stream, regionTable);
// Set stream to min size
stream.Position = fileEnd - 1;
stream.WriteByte(0);
// Metadata
FileParameters fileParams = new FileParameters()
{
BlockSize = (uint)blockSize, Flags = FileParametersFlags.None
};
ParentLocator parentLocator = new ParentLocator();
Stream metadataStream = new SubStream(stream, metadataRegion.FileOffset, metadataRegion.Length);
Metadata metadata = Metadata.Initialize(metadataStream, fileParams, (ulong)capacity, (uint)logicalSectorSize, (uint)physicalSectorSize, null);
}
/// <summary>
/// Opens an existing region within the VHDX file.
/// </summary>
/// <param name="region">Identifier for the region to open.</param>
/// <returns>A stream containing the region data.</returns>
/// <remarks>Regions are an extension mechanism in VHDX - with some regions defined by
/// the VHDX specification to hold metadata and the block allocation data.</remarks>
public Stream OpenRegion(Guid region)
{
RegionEntry metadataRegion = _regionTable.Regions[region];
return(new SubStream(_logicalStream, metadataRegion.FileOffset, metadataRegion.Length));
}
internal RegionInfo(RegionEntry entry)
{
_entry = entry;
}
private static void InitializeDynamicInternal(Stream stream, long capacity, long blockSize)
{
if (blockSize < Sizes.OneMiB || blockSize > Sizes.OneMiB * 256 || !Utilities.IsPowerOfTwo(blockSize))
{
throw new ArgumentOutOfRangeException("blockSize", blockSize, "BlockSize must be a power of 2 between 1MB and 256MB");
}
int logicalSectorSize = 512;
int physicalSectorSize = 4096;
long chunkRatio = (0x800000L * logicalSectorSize) / blockSize;
long dataBlocksCount = Utilities.Ceil(capacity, blockSize);
long sectorBitmapBlocksCount = Utilities.Ceil(dataBlocksCount, chunkRatio);
long totalBatEntriesDynamic = dataBlocksCount + ((dataBlocksCount - 1) / chunkRatio);
FileHeader fileHeader = new FileHeader() { Creator = ".NET DiscUtils" };
long fileEnd = Sizes.OneMiB;
VhdxHeader header1 = new VhdxHeader();
header1.SequenceNumber = 0;
header1.FileWriteGuid = Guid.NewGuid();
header1.DataWriteGuid = Guid.NewGuid();
header1.LogGuid = Guid.Empty;
header1.LogVersion = 0;
header1.Version = 1;
header1.LogLength = (uint)Sizes.OneMiB;
header1.LogOffset = (ulong)fileEnd;
header1.CalcChecksum();
fileEnd += header1.LogLength;
VhdxHeader header2 = new VhdxHeader(header1);
header2.SequenceNumber = 1;
header2.CalcChecksum();
RegionTable regionTable = new RegionTable();
RegionEntry metadataRegion = new RegionEntry();
metadataRegion.Guid = RegionEntry.MetadataRegionGuid;
metadataRegion.FileOffset = fileEnd;
metadataRegion.Length = (uint)Sizes.OneMiB;
metadataRegion.Flags = RegionFlags.Required;
regionTable.Regions.Add(metadataRegion.Guid, metadataRegion);
fileEnd += metadataRegion.Length;
RegionEntry batRegion = new RegionEntry();
batRegion.Guid = RegionEntry.BatGuid;
batRegion.FileOffset = 3 * Sizes.OneMiB;
batRegion.Length = (uint)Utilities.RoundUp(totalBatEntriesDynamic * 8, Sizes.OneMiB);
batRegion.Flags = RegionFlags.Required;
regionTable.Regions.Add(batRegion.Guid, batRegion);
fileEnd += batRegion.Length;
stream.Position = 0;
Utilities.WriteStruct(stream, fileHeader);
stream.Position = 64 * Sizes.OneKiB;
Utilities.WriteStruct(stream, header1);
stream.Position = 128 * Sizes.OneKiB;
Utilities.WriteStruct(stream, header2);
stream.Position = 192 * Sizes.OneKiB;
Utilities.WriteStruct(stream, regionTable);
stream.Position = 256 * Sizes.OneKiB;
Utilities.WriteStruct(stream, regionTable);
// Set stream to min size
stream.Position = fileEnd - 1;
stream.WriteByte(0);
// Metadata
FileParameters fileParams = new FileParameters() { BlockSize = (uint)blockSize, Flags = FileParametersFlags.None };
ParentLocator parentLocator = new ParentLocator();
Stream metadataStream = new SubStream(stream, metadataRegion.FileOffset, metadataRegion.Length);
Metadata metadata = Metadata.Initialize(metadataStream, fileParams, (ulong)capacity, (uint)logicalSectorSize, (uint)physicalSectorSize, null);
}
internal RegionInfo(RegionEntry entry)
{
_entry = entry;
}
internal override List<BuilderExtent> FixExtents(out long totalLength)
{
if (_diskType != DiskType.Dynamic)
{
throw new NotSupportedException("Creation of only dynamic disks currently implemented");
}
List<BuilderExtent> extents = new List<BuilderExtent>();
int logicalSectorSize = 512;
int physicalSectorSize = 4096;
long chunkRatio = (0x800000L * logicalSectorSize) / _blockSize;
long dataBlocksCount = Utilities.Ceil(_content.Length, _blockSize);
long sectorBitmapBlocksCount = Utilities.Ceil(dataBlocksCount, chunkRatio);
long totalBatEntriesDynamic = dataBlocksCount + ((dataBlocksCount - 1) / chunkRatio);
FileHeader fileHeader = new FileHeader() { Creator = ".NET DiscUtils" };
long fileEnd = Sizes.OneMiB;
VhdxHeader header1 = new VhdxHeader();
header1.SequenceNumber = 0;
header1.FileWriteGuid = Guid.NewGuid();
header1.DataWriteGuid = Guid.NewGuid();
header1.LogGuid = Guid.Empty;
header1.LogVersion = 0;
header1.Version = 1;
header1.LogLength = (uint)Sizes.OneMiB;
header1.LogOffset = (ulong)fileEnd;
header1.CalcChecksum();
fileEnd += header1.LogLength;
VhdxHeader header2 = new VhdxHeader(header1);
header2.SequenceNumber = 1;
header2.CalcChecksum();
RegionTable regionTable = new RegionTable();
RegionEntry metadataRegion = new RegionEntry();
metadataRegion.Guid = RegionEntry.MetadataRegionGuid;
metadataRegion.FileOffset = fileEnd;
metadataRegion.Length = (uint)Sizes.OneMiB;
metadataRegion.Flags = RegionFlags.Required;
regionTable.Regions.Add(metadataRegion.Guid, metadataRegion);
fileEnd += metadataRegion.Length;
RegionEntry batRegion = new RegionEntry();
batRegion.Guid = RegionEntry.BatGuid;
batRegion.FileOffset = fileEnd;
batRegion.Length = (uint)Utilities.RoundUp(totalBatEntriesDynamic * 8, Sizes.OneMiB);
batRegion.Flags = RegionFlags.Required;
regionTable.Regions.Add(batRegion.Guid, batRegion);
fileEnd += batRegion.Length;
extents.Add(ExtentForStruct(fileHeader, 0));
extents.Add(ExtentForStruct(header1, 64 * Sizes.OneKiB));
extents.Add(ExtentForStruct(header2, 128 * Sizes.OneKiB));
extents.Add(ExtentForStruct(regionTable, 192 * Sizes.OneKiB));
extents.Add(ExtentForStruct(regionTable, 256 * Sizes.OneKiB));
// Metadata
FileParameters fileParams = new FileParameters() { BlockSize = (uint)_blockSize, Flags = FileParametersFlags.None };
ParentLocator parentLocator = new ParentLocator();
byte[] metadataBuffer = new byte[metadataRegion.Length];
MemoryStream metadataStream = new MemoryStream(metadataBuffer);
Metadata.Initialize(metadataStream, fileParams, (ulong)_content.Length, (uint)logicalSectorSize, (uint)physicalSectorSize, null);
extents.Add(new BuilderBufferExtent(metadataRegion.FileOffset, metadataBuffer));
List<Range<long, long>> presentBlocks = new List<Range<long, long>>(StreamExtent.Blocks(_content.Extents, _blockSize));
// BAT
BlockAllocationTableBuilderExtent batExtent = new BlockAllocationTableBuilderExtent(batRegion.FileOffset, batRegion.Length, presentBlocks, fileEnd, _blockSize, chunkRatio);
extents.Add(batExtent);
// Stream contents
foreach (var range in presentBlocks)
{
long substreamStart = range.Offset * _blockSize;
long substreamCount = Math.Min(_content.Length - substreamStart, range.Count * _blockSize);
SubStream dataSubStream = new SubStream(_content, substreamStart, substreamCount);
BuilderSparseStreamExtent dataExtent = new BuilderSparseStreamExtent(fileEnd, dataSubStream);
extents.Add(dataExtent);
fileEnd += range.Count * _blockSize;
}
totalLength = fileEnd;
return extents;
}
internal override List <BuilderExtent> FixExtents(out long totalLength)
{
if (_diskType != DiskType.Dynamic)
{
throw new NotSupportedException("Creation of only dynamic disks currently implemented");
}
List <BuilderExtent> extents = new List <BuilderExtent>();
int logicalSectorSize = 512;
int physicalSectorSize = 4096;
long chunkRatio = (0x800000L * logicalSectorSize) / _blockSize;
long dataBlocksCount = Utilities.Ceil(_content.Length, _blockSize);
long sectorBitmapBlocksCount = Utilities.Ceil(dataBlocksCount, chunkRatio);
long totalBatEntriesDynamic = dataBlocksCount + ((dataBlocksCount - 1) / chunkRatio);
FileHeader fileHeader = new FileHeader()
{
Creator = ".NET DiscUtils"
};
long fileEnd = Sizes.OneMiB;
VhdxHeader header1 = new VhdxHeader();
header1.SequenceNumber = 0;
header1.FileWriteGuid = Guid.NewGuid();
header1.DataWriteGuid = Guid.NewGuid();
header1.LogGuid = Guid.Empty;
header1.LogVersion = 0;
header1.Version = 1;
header1.LogLength = (uint)Sizes.OneMiB;
header1.LogOffset = (ulong)fileEnd;
header1.CalcChecksum();
fileEnd += header1.LogLength;
VhdxHeader header2 = new VhdxHeader(header1);
header2.SequenceNumber = 1;
header2.CalcChecksum();
RegionTable regionTable = new RegionTable();
RegionEntry metadataRegion = new RegionEntry();
metadataRegion.Guid = RegionEntry.MetadataRegionGuid;
metadataRegion.FileOffset = fileEnd;
metadataRegion.Length = (uint)Sizes.OneMiB;
metadataRegion.Flags = RegionFlags.Required;
regionTable.Regions.Add(metadataRegion.Guid, metadataRegion);
fileEnd += metadataRegion.Length;
RegionEntry batRegion = new RegionEntry();
batRegion.Guid = RegionEntry.BatGuid;
batRegion.FileOffset = fileEnd;
batRegion.Length = (uint)Utilities.RoundUp(totalBatEntriesDynamic * 8, Sizes.OneMiB);
batRegion.Flags = RegionFlags.Required;
regionTable.Regions.Add(batRegion.Guid, batRegion);
fileEnd += batRegion.Length;
extents.Add(ExtentForStruct(fileHeader, 0));
extents.Add(ExtentForStruct(header1, 64 * Sizes.OneKiB));
extents.Add(ExtentForStruct(header2, 128 * Sizes.OneKiB));
extents.Add(ExtentForStruct(regionTable, 192 * Sizes.OneKiB));
extents.Add(ExtentForStruct(regionTable, 256 * Sizes.OneKiB));
// Metadata
FileParameters fileParams = new FileParameters()
{
BlockSize = (uint)_blockSize, Flags = FileParametersFlags.None
};
ParentLocator parentLocator = new ParentLocator();
byte[] metadataBuffer = new byte[metadataRegion.Length];
MemoryStream metadataStream = new MemoryStream(metadataBuffer);
Metadata.Initialize(metadataStream, fileParams, (ulong)_content.Length, (uint)logicalSectorSize, (uint)physicalSectorSize, null);
extents.Add(new BuilderBufferExtent(metadataRegion.FileOffset, metadataBuffer));
List <Range <long, long> > presentBlocks = new List <Range <long, long> >(StreamExtent.Blocks(_content.Extents, _blockSize));
// BAT
BlockAllocationTableBuilderExtent batExtent = new BlockAllocationTableBuilderExtent(batRegion.FileOffset, batRegion.Length, presentBlocks, fileEnd, _blockSize, chunkRatio);
extents.Add(batExtent);
// Stream contents
foreach (var range in presentBlocks)
{
long substreamStart = range.Offset * _blockSize;
long substreamCount = Math.Min(_content.Length - substreamStart, range.Count * _blockSize);
SubStream dataSubStream = new SubStream(_content, substreamStart, substreamCount);
BuilderSparseStreamExtent dataExtent = new BuilderSparseStreamExtent(fileEnd, dataSubStream);
extents.Add(dataExtent);
fileEnd += range.Count * _blockSize;
}
totalLength = fileEnd;
return(extents);
}
