internal static Metadata Initialize(Stream metadataStream, FileParameters fileParameters, ulong diskSize,
uint logicalSectorSize, uint physicalSectorSize, ParentLocator parentLocator)
{
MetadataTable header = new MetadataTable();
uint dataOffset = (uint)(64 * Sizes.OneKiB);
dataOffset += AddEntryStruct(fileParameters, MetadataTable.FileParametersGuid, MetadataEntryFlags.IsRequired,
header, dataOffset, metadataStream);
dataOffset += AddEntryValue(diskSize, Utilities.WriteBytesLittleEndian, MetadataTable.VirtualDiskSizeGuid,
MetadataEntryFlags.IsRequired | MetadataEntryFlags.IsVirtualDisk, header, dataOffset, metadataStream);
dataOffset += AddEntryValue(Guid.NewGuid(), Utilities.WriteBytesLittleEndian, MetadataTable.Page83DataGuid,
MetadataEntryFlags.IsRequired | MetadataEntryFlags.IsVirtualDisk, header, dataOffset, metadataStream);
dataOffset += AddEntryValue(logicalSectorSize, Utilities.WriteBytesLittleEndian,
MetadataTable.LogicalSectorSizeGuid, MetadataEntryFlags.IsRequired | MetadataEntryFlags.IsVirtualDisk,
header, dataOffset, metadataStream);
dataOffset += AddEntryValue(physicalSectorSize, Utilities.WriteBytesLittleEndian,
MetadataTable.PhysicalSectorSizeGuid, MetadataEntryFlags.IsRequired | MetadataEntryFlags.IsVirtualDisk,
header, dataOffset, metadataStream);
if (parentLocator != null)
{
dataOffset += AddEntryStruct(parentLocator, MetadataTable.ParentLocatorGuid,
MetadataEntryFlags.IsRequired, header, dataOffset, metadataStream);
}
metadataStream.Position = 0;
Utilities.WriteStruct(metadataStream, header);
return(new Metadata(metadataStream));
}
public Metadata(Stream regionStream)
{
_regionStream = regionStream;
_regionStream.Position = 0;
_table = Utilities.ReadStruct <MetadataTable>(_regionStream);
_fileParams = ReadStruct <FileParameters>(MetadataTable.FileParametersGuid, false);
_diskSize = ReadValue <ulong>(MetadataTable.VirtualDiskSizeGuid, false, Utilities.ToUInt64LittleEndian);
_page83Data = ReadValue <Guid>(MetadataTable.Page83DataGuid, false, Utilities.ToGuidLittleEndian);
_logicalSectorSize = ReadValue <uint>(MetadataTable.LogicalSectorSizeGuid, false, Utilities.ToUInt32LittleEndian);
_physicalSectorSize = ReadValue <uint>(MetadataTable.PhysicalSectorSizeGuid, false, Utilities.ToUInt32LittleEndian);
_parentLocator = ReadStruct <ParentLocator>(MetadataTable.ParentLocatorGuid, false);
}
private static uint AddEntryValue <T>(T data, Writer <T> writer, Guid id, MetadataEntryFlags flags,
MetadataTable header, uint dataOffset, Stream stream)
{
MetadataEntryKey key = new MetadataEntryKey(id, (flags & MetadataEntryFlags.IsUser) != 0);
MetadataEntry entry = new MetadataEntry();
entry.ItemId = id;
entry.Offset = dataOffset;
entry.Length = (uint)ReflectionHelper.SizeOf <T>();
entry.Flags = flags;
header.Entries[key] = entry;
stream.Position = dataOffset;
byte[] buffer = new byte[entry.Length];
writer(data, buffer, 0);
stream.Write(buffer, 0, buffer.Length);
return(entry.Length);
}
private static uint AddEntryStruct <T>(T data, Guid id, MetadataEntryFlags flags, MetadataTable header,
uint dataOffset, Stream stream)
where T : IByteArraySerializable
{
MetadataEntryKey key = new MetadataEntryKey(id, (flags & MetadataEntryFlags.IsUser) != 0);
MetadataEntry entry = new MetadataEntry();
entry.ItemId = id;
entry.Offset = dataOffset;
entry.Length = (uint)data.Size;
entry.Flags = flags;
header.Entries[key] = entry;
stream.Position = dataOffset;
Utilities.WriteStruct(stream, data);
return(entry.Length);
}
internal MetadataTableInfo(MetadataTable table)
{
_table = table;
}