public ServerSparseExtentStream(Stream file, Ownership ownsFile, long diskOffset, SparseStream parentDiskStream, Ownership ownsParentDiskStream)
{
_fileStream = file;
_ownsFileStream = ownsFile;
_diskOffset = diskOffset;
_parentDiskStream = parentDiskStream;
_ownsParentDiskStream = ownsParentDiskStream;
file.Position = 0;
byte[] firstSectors = Utilities.ReadFully(file, Sizes.Sector * 4);
_serverHeader = ServerSparseExtentHeader.Read(firstSectors, 0);
_header = _serverHeader;
_gtCoverage = _header.NumGTEsPerGT * (long)_header.GrainSize * Sizes.Sector;
LoadGlobalDirectory();
}
public static ServerSparseExtentHeader Read(byte[] buffer, int offset)
{
ServerSparseExtentHeader hdr = new ServerSparseExtentHeader();
hdr.MagicNumber = Utilities.ToUInt32LittleEndian(buffer, offset + 0x00);
hdr.Version = Utilities.ToUInt32LittleEndian(buffer, offset + 0x04);
hdr.Flags = Utilities.ToUInt32LittleEndian(buffer, offset + 0x08);
hdr.Capacity = Utilities.ToUInt32LittleEndian(buffer, offset + 0x0C);
hdr.GrainSize = Utilities.ToUInt32LittleEndian(buffer, offset + 0x10);
hdr.GdOffset = Utilities.ToUInt32LittleEndian(buffer, offset + 0x14);
hdr.NumGdEntries = Utilities.ToUInt32LittleEndian(buffer, offset + 0x18);
hdr.FreeSector = Utilities.ToUInt32LittleEndian(buffer, offset + 0x1C);
hdr.SavedGeneration = Utilities.ToUInt32LittleEndian(buffer, offset + 0x660);
hdr.UncleanShutdown = Utilities.ToUInt32LittleEndian(buffer, offset + 0x66C);
hdr.NumGTEsPerGT = 4096;
return hdr;
}
internal static ServerSparseExtentHeader CreateServerSparseExtentHeader(long size)
{
uint numSectors = (uint)Utilities.Ceil(size, Sizes.Sector);
uint numGDEntries = (uint)Utilities.Ceil(numSectors * (long)Sizes.Sector, 2 * Sizes.OneMiB);
ServerSparseExtentHeader header = new ServerSparseExtentHeader();
header.Capacity = numSectors;
header.GrainSize = 1;
header.GdOffset = 4;
header.NumGdEntries = numGDEntries;
header.FreeSector = (uint)(header.GdOffset + Utilities.Ceil(numGDEntries * 4, Sizes.Sector));
return header;
}
public GlobalDirectoryExtent(ServerSparseExtentHeader header)
: base(header.GdOffset * Sizes.Sector, Utilities.RoundUp(header.NumGdEntries * 4, Sizes.Sector))
{
_buffer = new byte[Length];
}
private static long CalcSize(SparseStream content, ServerSparseExtentHeader header)
{
long numDataGrains = StreamExtent.BlockCount(content.Extents, header.GrainSize * Sizes.Sector);
long grainTableSectors = Utilities.Ceil(header.NumGTEsPerGT * 4, Sizes.Sector);
return (grainTableSectors + (numDataGrains * header.GrainSize)) * Sizes.Sector;
}
public GrainTableExtent(long outputStart, SparseStream content, ServerSparseExtentHeader header)
: base(outputStart, CalcSize(content, header))
{
_content = content;
_header = header;
}
