private FileRecord ReadMftRecord(bool useMftMirror, bool readMftMirror)
{
NTFSBootRecord bootRecord = m_volume.BootRecord;
long mftStartLCN = useMftMirror ? (long)bootRecord.MftMirrorStartLCN : (long)bootRecord.MftStartLCN;
long mftSegmentNumber = readMftMirror ? MftMirrorSegmentNumber : MasterFileTableSegmentNumber;
FileRecordSegment mftRecordSegment;
try
{
mftRecordSegment = ReadMftRecordSegment(mftStartLCN, mftSegmentNumber);
}
catch (InvalidDataException)
{
throw new InvalidDataException("Invalid MFT base record segment");
}
if (!mftRecordSegment.IsBaseFileRecord)
{
throw new InvalidDataException("Invalid MFT file record, MFT segment number did not correspond to a base file record segment");
}
AttributeRecord attributeListRecord = mftRecordSegment.GetImmediateAttributeRecord(AttributeType.AttributeList, String.Empty);
if (attributeListRecord == null)
{
return(new FileRecord(mftRecordSegment));
}
else
{
AttributeList attributeList = new AttributeList(m_volume, attributeListRecord);
List <AttributeListEntry> entries = attributeList.ReadEntries();
List <MftSegmentReference> references = AttributeList.GetSegmentReferenceList(entries);
int baseSegmentIndex = MftSegmentReference.IndexOfSegmentNumber(references, MasterFileTableSegmentNumber);
if (baseSegmentIndex >= 0)
{
references.RemoveAt(baseSegmentIndex);
}
List <FileRecordSegment> recordSegments = new List <FileRecordSegment>();
// we want the base record segment first
recordSegments.Add(mftRecordSegment);
foreach (MftSegmentReference reference in references)
{
FileRecordSegment segment;
try
{
segment = ReadMftRecordSegment(mftStartLCN, reference);
}
catch (InvalidDataException)
{
throw new InvalidDataException("Invalid MFT file record, referenced segment is invalid");
}
recordSegments.Add(segment);
}
return(new FileRecord(recordSegments));
}
}
private FileRecord ReadMftRecord(bool useMftMirror, bool readMftMirror)
{
NTFSBootRecord bootRecord = m_volume.BootRecord;
if (bootRecord != null)
{
long mftStartLCN = useMftMirror ? (long)bootRecord.MftMirrorStartLCN : (long)bootRecord.MftStartLCN;
long mftSegmentNumber = readMftMirror ? MftMirrorSegmentNumber : MasterFileTableSegmentNumber;
FileRecordSegment mftRecordSegment = ReadFileRecordSegment(mftStartLCN, mftSegmentNumber);
if (!mftRecordSegment.IsBaseFileRecord)
{
throw new InvalidDataException("Invalid MFT record, not a base record");
}
AttributeRecord attributeListRecord = mftRecordSegment.GetImmediateAttributeRecord(AttributeType.AttributeList, String.Empty);
if (attributeListRecord == null)
{
return(new FileRecord(mftRecordSegment));
}
else
{
// I have never personally seen an MFT with an attribute list
AttributeList attributeList = new AttributeList(m_volume, attributeListRecord);
List <AttributeListEntry> entries = attributeList.ReadEntries();
List <MftSegmentReference> references = AttributeList.GetSegmentReferenceList(entries);
int baseSegmentIndex = MftSegmentReference.IndexOfSegmentNumber(references, MasterFileTableSegmentNumber);
if (baseSegmentIndex >= 0)
{
references.RemoveAt(baseSegmentIndex);
}
List <FileRecordSegment> recordSegments = new List <FileRecordSegment>();
// we want the base record segment first
recordSegments.Add(mftRecordSegment);
foreach (MftSegmentReference reference in references)
{
FileRecordSegment segment = ReadFileRecordSegment(mftStartLCN, reference);
if (segment != null)
{
recordSegments.Add(segment);
}
else
{
throw new InvalidDataException("Invalid MFT record, missing segment");
}
}
return(new FileRecord(recordSegments));
}
}
else
{
return(null);
}
}
public FileRecord GetFileRecord(long baseSegmentNumber)
{
FileRecordSegment baseSegment = GetFileRecordSegment(baseSegmentNumber);
if (baseSegment != null && baseSegment.IsBaseFileRecord)
{
AttributeRecord attributeListRecord = baseSegment.GetImmediateAttributeRecord(AttributeType.AttributeList, String.Empty);
if (attributeListRecord == null)
{
return(new FileRecord(baseSegment));
}
else
{
// The attribute list contains entries for every attribute the record has (excluding the attribute list),
// including attributes that reside within the base record segment.
AttributeList attributeList = new AttributeList(m_volume, attributeListRecord);
List <AttributeListEntry> entries = attributeList.ReadEntries();
List <MftSegmentReference> references = AttributeList.GetSegmentReferenceList(entries);
int baseSegmentIndex = MftSegmentReference.IndexOfSegmentNumber(references, baseSegmentNumber);
if (baseSegmentIndex >= 0)
{
references.RemoveAt(baseSegmentIndex);
}
List <FileRecordSegment> recordSegments = new List <FileRecordSegment>();
// we want the base record segment first
recordSegments.Add(baseSegment);
foreach (MftSegmentReference reference in references)
{
FileRecordSegment segment = GetFileRecordSegment(reference);
if (segment != null)
{
recordSegments.Add(segment);
}
else
{
// record is invalid
return(null);
}
}
return(new FileRecord(recordSegments));
}
}
else
{
return(null);
}
}