private void ReadIndexUpdated(BinaryReader reader, FPakInfo info, byte[] aesKey)
{
MountPoint = reader.ReadFString();
if (MountPoint.StartsWith("../../.."))
{
MountPoint = MountPoint.Substring(8);
}
else
{
MountPoint = "/";
}
var filesNum = reader.ReadInt32();
reader.ReadUInt64();
if (reader.ReadInt32() == 0)
{
throw new FileLoadException("No path hash index");
}
//reader.ReadInt64();
//reader.ReadInt64();
reader.BaseStream.Position += 20L + 8L + 8L;
if (reader.ReadInt32() == 0)
{
throw new FileLoadException("No directory index");
}
var position = reader.ReadInt64();
var directoryIndexSize = reader.ReadInt64();
reader.BaseStream.Position += 20L;
var encodedPakEntries = reader.ReadTArray(reader.ReadByte);
var files = reader.ReadInt32();
if (files < 0)
{
throw new FileLoadException("Corrupt pak PrimaryIndex detected!");
}
Reader.BaseStream.Position = position;
var directoryIndexData = Reader.ReadBytes((int)directoryIndexSize);
if (info.bEncryptedIndex != 0)
{
directoryIndexData = AESDecryptor.DecryptAES(directoryIndexData, aesKey);
}
var directoryIndexReader = new BinaryReader(new MemoryStream(directoryIndexData));
var directoryEntries = directoryIndexReader.ReadTArray(() => new FPakDirectoryEntry(directoryIndexReader));
var entries = new List <FPakEntry>(filesNum);
foreach (var directoryEntry in directoryEntries)
{
foreach (var hashIndexEntry in directoryEntry.Entries)
{
string path = MountPoint + directoryEntry.Directory + hashIndexEntry.Filename;
entries.Add(GetEntry(path, hashIndexEntry.Location, encodedPakEntries));
}
}
this.FileInfos = entries.ToArray();
}
public PakReader(Stream stream, string name, byte[] aes = null, bool ParseFiles = true)
{
Aes = aes;
Stream = stream;
Name = name;
Reader = new BinaryReader(Stream);
Stream.Seek(-FPakInfo.Size, SeekOrigin.End);
FPakInfo info = new FPakInfo(Reader);
if (info.Magic != FPakInfo.PAK_FILE_MAGIC)
{
DebugHelper.WriteLine(".PAKs: The file magic is invalid");
throw new FileLoadException("The file magic is invalid");
}
if (info.Version > (int)PAK_VERSION.PAK_LATEST)
{
DebugHelper.WriteLine($".PAKs: WARNING: Pak file \"{Name}\" has unsupported version {info.Version}");
}
if (info.bEncryptedIndex != 0)
{
if (Aes == null)
{
DebugHelper.WriteLine(".PAKs: The file has an encrypted index");
throw new FileLoadException("The file has an encrypted index");
}
}
// Read pak index
Stream.Seek(info.IndexOffset, SeekOrigin.Begin);
// Manage pak files with encrypted index
BinaryReader infoReader = Reader;
if (info.bEncryptedIndex != 0)
{
var InfoBlock = Reader.ReadBytes((int)info.IndexSize);
InfoBlock = AESDecryptor.DecryptAES(InfoBlock, Aes);
infoReader = new BinaryReader(new MemoryStream(InfoBlock));
int stringLen = infoReader.ReadInt32();
if (stringLen > 512 || stringLen < -512)
{
DebugHelper.WriteLine(".PAKs: The AES key is invalid");
throw new FileLoadException("The AES key is invalid");
}
if (stringLen < 0)
{
infoReader.BaseStream.Seek((stringLen - 1) * 2, SeekOrigin.Current);
ushort c = infoReader.ReadUInt16();
if (c != 0)
{
DebugHelper.WriteLine(".PAKs: The AES key is invalid");
throw new FileLoadException("The AES key is invalid");
}
}
else
{
infoReader.BaseStream.Seek(stringLen - 1, SeekOrigin.Current);
byte c = infoReader.ReadByte();
if (c != 0)
{
DebugHelper.WriteLine(".PAKs: The AES key is invalid");
throw new FileLoadException("The AES key is invalid");
}
}
infoReader.BaseStream.Seek(0, SeekOrigin.Begin);
}
if (!ParseFiles)
{
return;
}
if (info.Version >= (int)PAK_VERSION.PAK_PATH_HASH_INDEX)
{
ReadIndexUpdated(infoReader, info, Aes);
}
else
{
MountPoint = infoReader.ReadFString();
if (MountPoint.StartsWith("../../.."))
{
MountPoint = MountPoint.Substring(8);
}
else
{
MountPoint = "/";
}
FileInfos = new FPakEntry[infoReader.ReadInt32()];
for (int i = 0; i < FileInfos.Length; i++)
{
FileInfos[i] = new FPakEntry(infoReader, MountPoint, (PAK_VERSION)info.Version);
}
}
}
public PakReader(Stream stream, string name, byte[] aes = null, bool ParseFiles = true)
{
Aes = aes;
Stream = stream;
Name = name;
Reader = new BinaryReader(Stream);
Stream.Seek(-FPakInfo.Size, SeekOrigin.End);
FPakInfo info = new FPakInfo(Reader);
if (info.Magic != FPakInfo.PAK_FILE_MAGIC)
{
throw new FileLoadException("The file magic is invalid");
}
if (info.Version > (int)PAK_VERSION.PAK_LATEST)
{
Console.Error.WriteLine($"WARNING: Pak file \"{Name}\" has unsupported version {info.Version}");
}
if (info.bEncryptedIndex != 0)
{
if (Aes == null)
{
throw new FileLoadException("The file has an encrypted index");
}
}
// Read pak index
Stream.Seek(info.IndexOffset, SeekOrigin.Begin);
// Manage pak files with encrypted index
BinaryReader infoReader = Reader;
if (info.bEncryptedIndex != 0)
{
var InfoBlock = Reader.ReadBytes((int)info.IndexSize);
InfoBlock = AESDecryptor.DecryptAES(InfoBlock, (int)info.IndexSize, Aes, Aes.Length);
infoReader = new BinaryReader(new MemoryStream(InfoBlock));
int stringLen = infoReader.ReadInt32();
if (stringLen > 512 || stringLen < -512)
{
throw new FileLoadException("The AES key is invalid");
}
if (stringLen < 0)
{
infoReader.BaseStream.Seek((stringLen - 1) * 2, SeekOrigin.Current);
ushort c = infoReader.ReadUInt16();
if (c != 0)
{
throw new FileLoadException("The AES key is invalid");
}
}
else
{
infoReader.BaseStream.Seek(stringLen - 1, SeekOrigin.Current);
byte c = infoReader.ReadByte();
if (c != 0)
{
throw new FileLoadException("The AES key is invalid");
}
}
}
if (!ParseFiles)
{
return;
}
// Pak index reading time :)
infoReader.BaseStream.Seek(0, SeekOrigin.Begin);
MountPoint = infoReader.ReadString(FPakInfo.MAX_PACKAGE_PATH);
bool badMountPoint = false;
if (!MountPoint.StartsWith("../../.."))
{
badMountPoint = true;
}
else
{
MountPoint = MountPoint.Substring(8);
}
if (MountPoint[0] != '/' || ((MountPoint.Length > 1) && (MountPoint[1] == '.')))
{
badMountPoint = true;
}
if (badMountPoint)
{
Console.Error.WriteLine($"WARNING: Pak \"{Name}\" has strange mount point \"{MountPoint}\", mounting to root");
MountPoint = "/";
}
FileInfos = new FPakEntry[infoReader.ReadInt32()];
for (int i = 0; i < FileInfos.Length; i++)
{
FileInfos[i] = new FPakEntry(infoReader, MountPoint, info.Version);
}
}