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);
}
public void Enqueue(DbPackage package, IdxEntry entry)
{
if (_disposed)
{
throw new ObjectDisposedException("DbExtractor already disposed.");
}
if (_exceptions.Count > 0)
{
Dispose();
}
_semaphore.WaitOne();
lock (_queue)
{
_queue.Enqueue(Tuple.Create(package, entry));
Monitor.Pulse(_queue);
}
}
private void Extract(DbPackage package, IdxEntry entry, ThreadContext context)
{
if (context.Package != package)
{
context.Stream?.Dispose();
context.Stream = File.OpenRead(package.FullPath);
context.Package = package;
}
Byte[] buff = context.Buffer;
if (buff == null)
{
buff = new Byte[entry.UncompressedSize];
context.Buffer = buff;
}
else if (buff.Length < entry.UncompressedSize)
{
Array.Resize(ref buff, entry.UncompressedSize);
context.Buffer = buff;
}
FileStream inputStream = context.Stream;
if (inputStream.Position != entry.Offset)
{
inputStream.Position = entry.Offset;
}
if (entry.IsCompressed)
{
unsafe
{
fixed(Byte *ptr = buff)
{
Int32 readedSize = context.Decompressor.ReadCompressedFile(entry.CompressedSize, ptr, inputStream);
if (readedSize != entry.UncompressedSize)
{
throw new EndOfStreamException($"Failed to decompress the file {package.Name}:{entry.Offset}");
}
}
}
}
else
{
Int32 offset = 0;
Int32 size = entry.UncompressedSize;
while (size > 0)
{
Int32 readed = inputStream.Read(buff, offset, size);
if (readed == 0 && size > 0)
{
throw new EndOfStreamException($"Failed to copy the file {package.Name}:{entry.Offset}");
}
size -= readed;
offset += readed;
}
}
String directoryPath = Path.Combine(_outputDirectory, package.Name);
if (entry.CompressedSize < 8)
{
throw new NotSupportedException($"Compressed size is too small: {entry.CompressedSize}");
}
UInt16 version = UInt16.MaxValue;
void CheckVersion(String name, Int32 supported)
{
version = UInt16.Parse(Encoding.ASCII.GetString(buff, 2, 2), NumberStyles.Integer, CultureInfo.InvariantCulture);
if (version != supported)
{
throw new NotSupportedException($"Invalid {name} version: {version}. Expected: {supported}");
}
}
String GetOutputPath(String tag)
{
DbRecordId recordId = new DbRecordId(entry.ResourceId);
return(Path.Combine(directoryPath, Rename && DbNames.TryGetRecordName(recordId, out var name)
? $"{recordId}_{name}.{tag.ToLowerInvariant()}"
: $"{recordId}.{tag.ToLowerInvariant()}"));
}
String outputPath;
ITarget target;
String magicTag = Encoding.ASCII.GetString(buff, 0, 2);
switch (magicTag)
{
case "LV":
CheckVersion(magicTag, _version.LV);
outputPath = GetOutputPath(magicTag);
target = CopyTarget.Instance;
break;
case "AM":
CheckVersion(magicTag, _version.AM);
if (Convert)
{
outputPath = GetOutputPath("tiff");
target = ImageTarget.Instance;
}
else
{
outputPath = GetOutputPath(magicTag);
target = CopyTarget.Instance;
}
break;
case "GV":
CheckVersion(magicTag, _version.GV);
outputPath = GetOutputPath(magicTag);
target = GVTarget.Instance;
target = CopyTarget.Instance;
break;
case "TX":
CheckVersion(magicTag, _version.TX);
if (Convert)
{
outputPath = GetOutputPath("txt");
target = TextTarget.Instance;
}
else
{
outputPath = GetOutputPath(magicTag);
target = CopyTarget.Instance;
}
break;
case "CH":
CheckVersion(magicTag, _version.CH);
outputPath = GetOutputPath(magicTag);
target = CopyTarget.Instance;
break;
case "IL":
CheckVersion(magicTag, _version.IL);
outputPath = GetOutputPath(magicTag);
target = ILTarget.Instance;
target = CopyTarget.Instance;
break;
case "VS":
outputPath = GetOutputPath("vssf");
if (Convert)
{
outputPath = GetOutputPath("mp3");
target = SoundTarget.Instance;
}
else
{
outputPath = GetOutputPath(magicTag);
target = CopyTarget.Instance;
}
break;
default:
{
if (Encoding.ASCII.GetString(buff, 4, 4) != "moov")
{
throw new NotSupportedException($"Invalid magic number: {Encoding.ASCII.GetString(buff, 0, 8)}");
}
directoryPath = _outputDirectory;
outputPath = Path.Combine(directoryPath, $"{entry.ResourceId:X8}_{package.Name}.qt");
target = CopyTarget.Instance;
break;
}
}
if (!Convert)
{
target = CopyTarget.Instance;
}
Directory.CreateDirectory(directoryPath);
ArraySegment <Byte> segment = new ArraySegment <Byte>(buff, 0, entry.UncompressedSize);
target.Write(segment, outputPath, version);
}
