public IdxContent ReadContent()
{
unsafe
{
Byte[] idxData = File.ReadAllBytes(_mftContent.IndexFilePath);
if (idxData.Length % sizeof(IdxStruct) != 0)
{
throw new NotSupportedException($"The size of the file [{_mftContent.IndexFilePath}] is not a multiple of {sizeof(IdxStruct)}");
}
Int32 entriesCount = idxData.Length / sizeof(IdxStruct);
fixed(Byte *idxDataPtr = idxData)
{
IdxStruct *idxPtr = (IdxStruct *)idxDataPtr;
Dictionary <DbPackage, IdxEntry[]> dic = ReadDictionary(entriesCount, idxPtr);
return(new IdxContent(_mftContent.Packages, dic));
}
}
}
private unsafe Dictionary <DbPackage, IdxEntry[]> ReadDictionary(Int32 entriesCount, IdxStruct *idxPtr)
{
// Count files in packages
Dictionary <Int32, Int32> fileNumbers = new Dictionary <Int32, Int32>(_mftContent.Packages.Count);
for (Int32 i = 0; i < entriesCount; i++)
{
Int32 packageIndex = idxPtr[i].Package;
if (fileNumbers.TryGetValue(packageIndex, out Int32 count))
{
fileNumbers[packageIndex] = count + 1;
}
else
{
fileNumbers[packageIndex] = 1;
}
}
// Prepare dictionary
Dictionary <DbPackage, IdxEntry[]> dic = new Dictionary <DbPackage, IdxEntry[]>(fileNumbers.Count);
foreach (var pair in fileNumbers)
{
Int32 packageIndex = pair.Key;
Int32 fileCount = pair.Value;
DbPackage package = _mftContent.Packages[packageIndex];
IdxEntry[] idxEntries = new IdxEntry[fileCount];
dic.Add(package, idxEntries);
}
// Fill dicrionary
for (Int32 i = 0; i < entriesCount; i++)
{
IdxStruct idxEntry = idxPtr[i];
DbPackage package = _mftContent.Packages[idxEntry.Package];
IdxEntry[] idxEntries = dic[package];
Int32 fileIndex = IndexInPackage(idxEntry.Package, idxEntries);
idxEntries[fileIndex] = ToEntry(i, in idxEntry);
}
Int32 IndexInPackage(Int32 packageNumber, IdxEntry[] array)
{
return(array.Length - fileNumbers[packageNumber]--);
}
return(dic);
}
