private void Load()
{
IStreamProvider
fStreamProvider = this.StreamProvider;
using (Stream fLoadingStream = fStreamProvider.GetReadonlyStream())
{
//We Must start at the beginning
fLoadingStream.Seek(0L, SeekOrigin.Begin);
long
fStreamLength = fLoadingStream.Length;
long
fiStart = 0;
FormatSignatureAndVersionInfo
fFormatSignatureAndVersionInfo = null;
while (fiStart < fStreamLength)
{
if (FormatSignatureAndVersionInfo.TryRead(
fLoadingStream,
out fFormatSignatureAndVersionInfo))
{
//TODO: Verify Checksum for Version 2 + 3 Here
// before we decide to break or not
break;
}
// Look for correct HDF5 start a 512, 1024, 2048, etc
// See https://support.hdfgroup.org/HDF5/doc/H5.format.html#Superblock
fiStart = fiStart == 0
? 512
: fiStart * 2;
}
if (ReferenceEquals(null, fFormatSignatureAndVersionInfo))
{
throw new Exception("This does not appear to be an HDF5 file / stream");
}
this.mrFileData.Register(
fFormatSignatureAndVersionInfo);
}
}
internal protected Hdf5Reader GetReader() => new Hdf5Reader(
mrStreamProvider.GetReadonlyStream(),
mrSuperBlock);
private ISuperBlock ParseV0orV1(SuperBlockObj aContainer, bool aIsV1)
{
using (Stream fStream = mrStreamProvider.GetReadonlyStream())
{
fStream.Seek(
(long)(ulong)aContainer.LocationAddress + FormatSignatureAndVersionInfo.Length,
SeekOrigin.Begin);
const byte
fcHeaderBytes = 15;
byte[]
fHeadbuffer = new byte[fcHeaderBytes];
if (fcHeaderBytes != fStream.Read(fHeadbuffer, 0, fcHeaderBytes))
{
throw new EndOfStreamException("Could not read Superblock");
}
aContainer.FreeSpaceStorageVersion = fHeadbuffer[0];
aContainer.RootGroupSymbolTableVersion = fHeadbuffer[1];
if (fHeadbuffer[2] != 0)
{
throw new InvalidDataException("Reserved byte expected to be zero");
}
aContainer.SharedHeaderMessageFormatVersion = fHeadbuffer[3];
aContainer.SizeOfOffsets = fHeadbuffer[4];
aContainer.SizeOfLengths = fHeadbuffer[5];
if (fHeadbuffer[6] != 0)
{
throw new InvalidDataException("Reserved byte expected to be zero");
}
aContainer.GroupLeafNodeK = (ushort)(fHeadbuffer[7] | (fHeadbuffer[8] << 8));
aContainer.GroupInternalNodeK = (ushort)(fHeadbuffer[9] | (fHeadbuffer[10] << 8));
if (aIsV1)
{
const int
fcV1FeildBytes = 4;
byte[]
fV1Buffer = new byte[fcV1FeildBytes];
if (fcV1FeildBytes != fStream.Read(fV1Buffer, 0, fcV1FeildBytes))
{
throw new EndOfStreamException("Could not read Superblock");
}
aContainer.IndexedStorageInternalNodeK = (ushort)(fV1Buffer[0] + (fV1Buffer[1] << 8));
if (!(fV1Buffer[2] == 0 || fV1Buffer[3] == 0))
{
throw new InvalidDataException("Reserved bytes expected to be zero");
}
}
aContainer.BaseAddress = aContainer.LocationAddress;
using (Hdf5Reader fReader = new Hdf5Reader(fStream, aContainer, false))
{
Offset
fBaseAddress = fReader.ReadOffset(),
fFreeSpaceAddress = fReader.ReadOffset(),
fEndOfFileAddress = fReader.ReadOffset(),
fDirverInformationBlockAddress = fReader.ReadOffset();
SymbolTableEntry
fRootGroupEntry = SymbolTableEntry.Read(fReader);
if (fBaseAddress.IsNull())
{
throw new InvalidDataException("No base adddress Specified");
}
aContainer.BaseAddress = fBaseAddress;
aContainer.FileFreespaceInfoAddress = fFreeSpaceAddress;
if (fEndOfFileAddress.IsNull())
{
throw new InvalidDataException("No End Of file Adddress Specified");
}
aContainer.EndOfFileAddress = fEndOfFileAddress;
aContainer.DriverInformationBlockAddress = fDirverInformationBlockAddress;
aContainer.RootGroupSymbolTableEntry = fRootGroupEntry;
aContainer.RootGroupAddress = fRootGroupEntry.ObjectHeaderAddress;
}
}
return(aContainer);
}