public IndexData(NTFSVolume volume, FileRecord fileRecord, AttributeType indexedAttributeType)
{
m_volume = volume;
m_fileRecord = fileRecord;
m_indexedAttributeType = indexedAttributeType;
m_indexName = IndexHelper.GetIndexName(indexedAttributeType);
m_rootRecord = (IndexRootRecord)m_fileRecord.GetAttributeRecord(AttributeType.IndexRoot, m_indexName);
// I have observed the NTFS v5.1 driver keeping the IndexAllocation and associated Bitmap attributes after deleting files from the directory even though m_rootRecord.IsParentNode is set to false.
m_indexAllocationRecord = (IndexAllocationRecord)m_fileRecord.GetAttributeRecord(AttributeType.IndexAllocation, m_indexName);
m_bitmapRecord = m_fileRecord.GetAttributeRecord(AttributeType.Bitmap, m_indexName);
if (m_indexAllocationRecord != null && m_bitmapRecord != null)
{
m_indexAllocationData = new NonResidentAttributeData(m_volume, m_fileRecord, m_indexAllocationRecord);
long numberOfUsableBits = (long)(m_indexAllocationRecord.DataLength / m_rootRecord.BytesPerIndexRecord);
m_bitmapData = new BitmapData(m_volume, m_fileRecord, m_bitmapRecord, numberOfUsableBits);
}
else if (m_rootRecord.IsParentNode && m_indexAllocationRecord == null)
{
throw new InvalidDataException("Missing Index Allocation Record");
}
else if (m_rootRecord.IsParentNode && m_bitmapRecord == null)
{
throw new InvalidDataException("Missing Index Bitmap Record");
}
}
public override void Delete(string path)
{
string streamName = GetStreamName(path);
path = GetFilePath(path);
FileRecord fileRecord = m_volume.GetFileRecord(path);
if (streamName == String.Empty)
{
m_volume.DeleteFile(fileRecord);
}
else
{
// We only delete the named stream
AttributeRecord dataRecord = fileRecord.GetAttributeRecord(AttributeType.Data, streamName);
if (dataRecord == null)
{
throw new FileNotFoundException(String.Format("The file '{0}' does not contain a stream named '{1}'", path, streamName));
}
AttributeData attributeData = new AttributeData(m_volume, fileRecord, dataRecord);
attributeData.Truncate(0);
fileRecord.RemoveAttributeRecord(AttributeType.Data, streamName);
m_volume.UpdateFileRecord(fileRecord);
}
}
/// <param name="attributeName">The name of the data attribute we wish to access</param>
public NTFSFile(NTFSVolume volume, FileRecord fileRecord, string attributeName)
{
m_volume = volume;
m_fileRecord = fileRecord;
AttributeRecord attributeRecord = fileRecord.GetAttributeRecord(AttributeType.Data, attributeName);
m_data = new AttributeData(m_volume, m_fileRecord, attributeRecord);
}
public override FileSystemEntry GetEntry(string path)
{
string streamName = GetStreamName(path);
path = GetFilePath(path);
FileRecord fileRecord = m_volume.GetFileRecord(path);
if (streamName != String.Empty && fileRecord.GetAttributeRecord(AttributeType.Data, streamName) == null)
{
throw new FileNotFoundException(String.Format("The file '{0}' does not contain a stream named '{1}'", path, streamName));
}
return(ToFileSystemEntry(path, fileRecord));
}
internal VolumeInformationRecord GetVolumeInformationRecord()
{
FileRecord volumeRecord = m_mft.GetVolumeRecord();
if (volumeRecord != null)
{
return((VolumeInformationRecord)volumeRecord.GetAttributeRecord(AttributeType.VolumeInformation, String.Empty));
}
else
{
throw new InvalidDataException("Invalid NTFS volume record");
}
}
private KeyValuePairList <MftSegmentReference, FileNameRecord> GetFileNameRecordsInDirectory(long directoryBaseSegmentNumber)
{
FileRecord record = m_mft.GetFileRecord(directoryBaseSegmentNumber);
KeyValuePairList <MftSegmentReference, FileNameRecord> result = null;
if (record != null && record.IsDirectory)
{
IndexRootRecord indexRoot = (IndexRootRecord)record.GetAttributeRecord(AttributeType.IndexRoot, IndexRootRecord.FileNameIndexName);
IndexAllocationRecord indexAllocation = (IndexAllocationRecord)record.GetAttributeRecord(AttributeType.IndexAllocation, IndexRootRecord.FileNameIndexName);
if (indexRoot.IsLargeIndex)
{
if (indexAllocation != null)
{
result = indexAllocation.GetAllEntries(this, indexRoot);
}
}
else
{
result = indexRoot.GetSmallIndexEntries();
}
if (result != null)
{
for (int index = 0; index < result.Count; index++)
{
if (result[index].Value.Namespace == FilenameNamespace.DOS)
{
// The same FileRecord can have multiple entries, each with it's own namespace
result.RemoveAt(index);
index--;
}
}
}
}
return(result);
}
public override Stream OpenFile(string path, FileMode mode, FileAccess access, FileShare share, FileOptions options)
{
string streamName = GetStreamName(path);
path = GetFilePath(path);
FileRecord fileRecord = null;
AttributeRecord dataRecord = null;
if (mode == FileMode.CreateNew || mode == FileMode.Create || mode == FileMode.OpenOrCreate)
{
bool fileExists = false;
try
{
fileRecord = m_volume.GetFileRecord(path);
fileExists = true;
}
catch (FileNotFoundException)
{
}
catch (DirectoryNotFoundException)
{
}
if (fileExists)
{
if (mode == FileMode.CreateNew)
{
if (streamName == String.Empty)
{
throw new AlreadyExistsException();
}
else
{
dataRecord = fileRecord.GetAttributeRecord(AttributeType.Data, streamName);
if (dataRecord != null)
{
throw new AlreadyExistsException();
}
}
}
if (streamName != String.Empty && dataRecord == null)
{
// We might need to allocate an additional FileRecordSegment so we have to make sure we can extend the MFT if it is full
if (m_volume.NumberOfFreeClusters < m_volume.NumberOfClustersRequiredToExtendMft)
{
throw new DiskFullException();
}
fileRecord.CreateAttributeRecord(AttributeType.Data, streamName);
m_volume.UpdateFileRecord(fileRecord);
}
if (mode == FileMode.Create)
{
mode = FileMode.Truncate;
}
}
else
{
string directoryPath = Path.GetDirectoryName(path);
string fileName = Path.GetFileName(path);
FileRecord directoryRecord = m_volume.GetFileRecord(directoryPath);
fileRecord = m_volume.CreateFile(directoryRecord.BaseSegmentReference, fileName, false);
if (streamName != String.Empty)
{
fileRecord.CreateAttributeRecord(AttributeType.Data, streamName);
m_volume.UpdateFileRecord(fileRecord);
}
}
}
else // Open, Truncate or Append
{
fileRecord = m_volume.GetFileRecord(path);
dataRecord = fileRecord.GetAttributeRecord(AttributeType.Data, streamName);
if (streamName != String.Empty && dataRecord == null)
{
throw new FileNotFoundException(String.Format("The file '{0}' does not contain a stream named '{1}'", path, streamName));
}
}
if (fileRecord.IsDirectory)
{
throw new UnauthorizedAccessException();
}
List <NTFSFileStream> openStreams;
lock (m_openStreams)
{
if (m_openStreams.TryGetValue(fileRecord.BaseSegmentNumber, out openStreams))
{
if ((access & FileAccess.Write) != 0)
{
// Currently we only support opening a file stream for write access if no other stream is opened for that file
throw new SharingViolationException();
}
else if ((access & FileAccess.Read) != 0)
{
foreach (NTFSFileStream openStream in openStreams)
{
if (openStream.CanWrite && ((share & FileShare.Write) == 0))
{
throw new SharingViolationException();
}
}
}
}
else
{
openStreams = new List <NTFSFileStream>();
m_openStreams.Add(fileRecord.BaseSegmentNumber, openStreams);
}
}
NTFSFile file = new NTFSFile(m_volume, fileRecord, streamName);
NTFSFileStream stream = new NTFSFileStream(file, access);
openStreams.Add(stream);
stream.Closed += delegate(object sender, EventArgs e)
{
openStreams.Remove(stream);
if (openStreams.Count == 0)
{
lock (m_openStreams)
{
m_openStreams.Remove(fileRecord.BaseSegmentNumber);
}
}
};
if (mode == FileMode.Truncate)
{
stream.SetLength(0);
}
else if (mode == FileMode.Append)
{
stream.Seek((long)file.Length, SeekOrigin.Begin);
}
return(stream);
}
internal VolumeInformationRecord GetVolumeInformationRecord()
{
FileRecord volumeRecord = m_mft.GetVolumeRecord();
return((VolumeInformationRecord)volumeRecord.GetAttributeRecord(AttributeType.VolumeInformation, String.Empty));
}