public FileRecord GetRecord(long index, bool ignoreMagic, bool ignoreBitmap)
{
if (ignoreBitmap || _bitmap == null || _bitmap.IsPresent(index))
{
FileRecord result = _recordCache[index];
if (result != null)
{
return(result);
}
if ((index + 1) * _recordLength <= _recordStream.Length)
{
_recordStream.Position = index * _recordLength;
byte[] recordBuffer = Utilities.ReadFully(_recordStream, _recordLength);
result = new FileRecord(_bytesPerSector);
result.FromBytes(recordBuffer, 0, ignoreMagic);
result.LoadedIndex = (uint)index;
}
else
{
result = new FileRecord(_bytesPerSector, _recordLength, (uint)index);
}
_recordCache[index] = result;
return(result);
}
return(null);
}
public FileRecord GetBootstrapRecord()
{
_recordStream.Position = 0;
byte[] mftSelfRecordData = Utilities.ReadFully(_recordStream, _recordLength);
FileRecord mftSelfRecord = new FileRecord(_bytesPerSector);
mftSelfRecord.FromBytes(mftSelfRecordData, 0);
_recordCache[MftIndex] = mftSelfRecord;
return(mftSelfRecord);
}
private bool VerifyMftRecord(byte[] recordData, bool presentInBitmap, int bytesPerSector)
{
bool ok = true;
//
// Verify the attributes seem OK...
//
byte[] tempBuffer = new byte[recordData.Length];
Array.Copy(recordData, tempBuffer, tempBuffer.Length);
GenericFixupRecord genericRecord = new GenericFixupRecord(bytesPerSector);
genericRecord.FromBytes(tempBuffer, 0);
int pos = Utilities.ToUInt16LittleEndian(genericRecord.Content, 0x14);
while (Utilities.ToUInt32LittleEndian(genericRecord.Content, pos) != 0xFFFFFFFF)
{
int attrLen;
try
{
AttributeRecord ar = AttributeRecord.FromBytes(genericRecord.Content, pos, out attrLen);
if (attrLen != ar.Size)
{
ReportError("Attribute size is different to calculated size. AttrId={0}", ar.AttributeId);
ok = false;
}
if (ar.IsNonResident)
{
NonResidentAttributeRecord nrr = (NonResidentAttributeRecord)ar;
if (nrr.DataRuns.Count > 0)
{
long totalVcn = 0;
foreach (var run in nrr.DataRuns)
{
totalVcn += run.RunLength;
}
if (totalVcn != nrr.LastVcn - nrr.StartVcn + 1)
{
ReportError("Declared VCNs doesn't match data runs. AttrId={0}", ar.AttributeId);
ok = false;
}
}
}
}
catch
{
ReportError("Failure parsing attribute at pos={0}", pos);
return(false);
}
pos += attrLen;
}
//
// Now consider record as a whole
//
FileRecord record = new FileRecord(bytesPerSector);
record.FromBytes(recordData, 0);
bool inUse = (record.Flags & FileRecordFlags.InUse) != 0;
if (inUse != presentInBitmap)
{
ReportError("MFT bitmap and record in-use flag don't agree. Mft={0}, Record={1}", presentInBitmap ? "InUse" : "Free", inUse ? "InUse" : "Free");
ok = false;
}
if (record.Size != record.RealSize)
{
ReportError("MFT record real size is different to calculated size. Stored in MFT={0}, Calculated={1}", record.RealSize, record.Size);
ok = false;
}
if (Utilities.ToUInt32LittleEndian(recordData, (int)record.RealSize - 8) != uint.MaxValue)
{
ReportError("MFT record is not correctly terminated with 0xFFFFFFFF");
ok = false;
}
return(ok);
}