private void PreVerifyMft(File file)
{
int recordLength = _context.BiosParameterBlock.MftRecordSize;
int bytesPerSector = _context.BiosParameterBlock.BytesPerSector;
// Check out the MFT's clusters
foreach (var range in file.GetAttribute(AttributeType.Data, null).GetClusters())
{
if (!VerifyClusterRange(range))
{
ReportError("Corrupt cluster range in MFT data attribute {0}", range.ToString());
Abort();
}
}
foreach (var range in file.GetAttribute(AttributeType.Bitmap, null).GetClusters())
{
if (!VerifyClusterRange(range))
{
ReportError("Corrupt cluster range in MFT bitmap attribute {0}", range.ToString());
Abort();
}
}
using (Stream mftStream = file.OpenStream(AttributeType.Data, null, FileAccess.Read))
using (Stream bitmapStream = file.OpenStream(AttributeType.Bitmap, null, FileAccess.Read))
{
Bitmap bitmap = new Bitmap(bitmapStream, long.MaxValue);
long index = 0;
while (mftStream.Position < mftStream.Length)
{
byte[] recordData = Utilities.ReadFully(mftStream, recordLength);
string magic = Utilities.BytesToString(recordData, 0, 4);
if (magic != "FILE")
{
if (bitmap.IsPresent(index))
{
ReportError("Invalid MFT record magic at index {0} - was ({2},{3},{4},{5}) \"{1}\"", index, magic.Trim('\0'), (int)magic[0], (int)magic[1], (int)magic[2], (int)magic[3]);
}
}
else
{
if (!VerifyMftRecord(recordData, bitmap.IsPresent(index), bytesPerSector))
{
ReportError("Invalid MFT record at index {0}", index);
StringBuilder bldr = new StringBuilder();
for (int i = 0; i < recordData.Length; ++i)
{
bldr.Append(string.Format(CultureInfo.InvariantCulture, " {0:X2}", recordData[i]));
}
ReportInfo("MFT record binary data for index {0}:{1}", index, bldr.ToString());
}
}
index++;
}
}
}
private bool SelfCheckIndexNode(byte[] buffer, int offset, Bitmap bitmap, IndexRoot root, string fileName, string indexName)
{
bool ok = true;
IndexHeader header = new IndexHeader(buffer, offset);
IndexEntry lastEntry = null;
IComparer<byte[]> collator = root.GetCollator(_context.UpperCase);
int pos = (int)header.OffsetToFirstEntry;
while (pos < header.TotalSizeOfEntries)
{
IndexEntry entry = new IndexEntry(indexName == "$I30");
entry.Read(buffer, offset + pos);
pos += entry.Size;
if ((entry.Flags & IndexEntryFlags.Node) != 0)
{
long bitmapIdx = entry.ChildrenVirtualCluster / Utilities.Ceil(root.IndexAllocationSize, _context.BiosParameterBlock.SectorsPerCluster * _context.BiosParameterBlock.BytesPerSector);
if (!bitmap.IsPresent(bitmapIdx))
{
ReportError("Index entry {0} is non-leaf, but child vcn {1} is not in bitmap at index {2}", Index.EntryAsString(entry, fileName, indexName), entry.ChildrenVirtualCluster, bitmapIdx);
}
}
if ((entry.Flags & IndexEntryFlags.End) != 0)
{
if (pos != header.TotalSizeOfEntries)
{
ReportError("Found END index entry {0}, but not at end of node", Index.EntryAsString(entry, fileName, indexName));
ok = false;
}
}
if (lastEntry != null && collator.Compare(lastEntry.KeyBuffer, entry.KeyBuffer) >= 0)
{
ReportError("Found entries out of order {0} was before {1}", Index.EntryAsString(lastEntry, fileName, indexName), Index.EntryAsString(entry, fileName, indexName));
ok = false;
}
lastEntry = entry;
}
return ok;
}