private Dictionary <string, FPakEntry> GetOldFiles(EPakLoader mode)
{
var diff = new Dictionary <string, FPakEntry>();
var ofd = new OpenFileDialog()
{
Title = Properties.Resources.SelectFile,
InitialDirectory = Properties.Settings.Default.OutputPath + "\\Backups\\",
Filter = Properties.Resources.FbkpFilter,
Multiselect = false
};
if ((bool)ofd.ShowDialog())
{
string n = Path.GetFileName(ofd.FileName);
StatusBarVm.statusBarViewModel.Set(string.Format(Properties.Resources.Analyzing, n), Properties.Resources.Processing);
DebugHelper.WriteLine("{0} {1} {2} {3}", "[FModel]", "[PakMenuItemViewModel]", "[Loader]", $"Backup file is {n}");
var oldFilesTemp = new Dictionary <string, FPakEntry>();
using FileStream fileStream = new FileStream(ofd.FileName, FileMode.Open);
BinaryReader checkReader = new BinaryReader(fileStream);
bool isLz4 = checkReader.ReadUInt32() == 0x184D2204u;
fileStream.Seek(0, SeekOrigin.Begin);
var target = new MemoryStream();
if (isLz4)
{
using LZ4DecoderStream compressionStream = LZ4Stream.Decode(fileStream);
compressionStream.CopyTo(target);
}
else
{
fileStream.CopyTo(target);
}
using (target)
{
target.Position = 0;
using BinaryReader reader = new BinaryReader(target);
while (reader.BaseStream.Position < reader.BaseStream.Length)
{
// we must follow this order
long offset = reader.ReadInt64();
long size = reader.ReadInt64();
long uncompressedSize = reader.ReadInt64();
bool encrypted = reader.ReadBoolean();
long structSize = reader.ReadInt32();
string name = reader.ReadString();
int compressionMethodIndex = reader.ReadInt32();
// we only need name and uncompressedSize to compare
FPakEntry entry = new FPakEntry("CatsWillDominateTheWorld.pak", name, offset, size, uncompressedSize, new byte[20], null, 0, (uint)compressionMethodIndex, 0);
oldFilesTemp[entry.Name] = entry;
}
}
var newFiles = new Dictionary <string, FPakEntry>();
foreach (var fileReader in Globals.CachedPakFiles)
{
foreach (var files in fileReader.Value)
{
newFiles.Add(files.Key, files.Value);
}
}
Paks.Merge(oldFilesTemp, out var oldFiles, string.Empty);
switch (mode)
{
case EPakLoader.New:
foreach (var kvp in newFiles)
{
if (!oldFiles.TryGetValue(kvp.Key, out var entry))
{
diff.Add(kvp.Key, kvp.Value);
}
}
break;
case EPakLoader.Modified:
foreach (var kvp in newFiles)
{
if (oldFiles.TryGetValue(kvp.Key, out var entry))
{
if (entry.UncompressedSize != kvp.Value.UncompressedSize)
{
diff.Add(kvp.Key, kvp.Value);
}
}
}
break;
case EPakLoader.NewModified:
foreach (var kvp in newFiles)
{
if (oldFiles.TryGetValue(kvp.Key, out var entry))
{
if (entry.UncompressedSize != kvp.Value.UncompressedSize)
{
diff.Add(kvp.Key, kvp.Value);
}
}
else
{
diff.Add(kvp.Key, kvp.Value);
}
}
break;
}
var deleted = oldFiles.Where(kvp => !newFiles.TryGetValue(kvp.Key, out var _) && kvp.Key.StartsWith("/FortniteGame/Content/Athena/Items/Cosmetics/")).ToDictionary(x => x.Key, x => x.Value);
if (deleted.Count > 0)
{
FConsole.AppendText(Properties.Resources.RemovedRenamedCosmetics, FColors.Red, true);
foreach (var kvp in deleted)
{
FConsole.AppendText($" - {kvp.Value.Name.Substring(1)}", FColors.LightGray, true);
}
}
}
return(diff);
}
void ReadIndexInternal(byte[] key, PakFilter filter, out Exception exc)
{
if (Initialized)
{
exc = new InvalidOperationException("Index is already initialized");
return;
}
if (Info.bEncryptedIndex && key == null)
{
exc = new ArgumentException("Index is encrypted but no key was provided", nameof(key));
return;
}
Stream.Position = Info.IndexOffset;
BinaryReader IndexReader;
if (Info.bEncryptedIndex)
{
IndexReader = new BinaryReader(new MemoryStream(AESDecryptor.DecryptAES(Reader.ReadBytes((int)Info.IndexSize), key)));
int stringLen = IndexReader.ReadInt32();
if (stringLen > 512 || stringLen < -512)
{
exc = new ArgumentException("The provided key is invalid", nameof(key));
return;
}
if (stringLen < 0)
{
IndexReader.BaseStream.Position += (stringLen - 1) * 2;
if (IndexReader.ReadUInt16() != 0)
{
exc = new ArgumentException("The provided key is invalid", nameof(key));
return;
}
}
else
{
IndexReader.BaseStream.Position += stringLen - 1;
if (IndexReader.ReadByte() != 0)
{
exc = new ArgumentException("The provided key is invalid", nameof(key));
return;
}
}
IndexReader.BaseStream.Position = 0;
}
else
{
IndexReader = Reader;
}
Dictionary <string, FPakEntry> tempFiles;
if (Info.Version >= EPakVersion.PATH_HASH_INDEX)
{
ReadIndexUpdated(IndexReader, key, out tempFiles, filter);
}
else
{
// https://github.com/EpicGames/UnrealEngine/blob/bf95c2cbc703123e08ab54e3ceccdd47e48d224a/Engine/Source/Runtime/PakFile/Private/IPlatformFilePak.cpp#L4509
MountPoint = IndexReader.ReadFString();
if (MountPoint.StartsWith("../../.."))
{
MountPoint = MountPoint.Substring(8);
}
else
{
// Weird mount point location...
MountPoint = "/";
}
if (!CaseSensitive)
{
MountPoint = MountPoint.ToLowerInvariant();
}
var NumEntries = IndexReader.ReadInt32();
tempFiles = new Dictionary <string, FPakEntry>(NumEntries);
for (int i = 0; i < NumEntries; i++)
{
var entry = new FPakEntry(IndexReader, Info.Version, CaseSensitive, FileName);
// if there is no filter OR the filter passes
if (filter == null || filter.CheckFilter(MountPoint + entry.Name, CaseSensitive))
{
// Filename is without the MountPoint concatenated to save memory
tempFiles[entry.Name] = entry;
}
}
}
Paks.Merge(tempFiles, out var files, MountPoint);
Entries = files;
DebugHelper.WriteLine("{0} {1} {2} {3}", "[FModel]", "[PakFileReader]", "[ReadIndexInternal]", $"{FileName} contains {Entries.Count} files, mount point: \"{this.MountPoint}\", version: {(int)this.Info.Version}");
if (Info.bEncryptedIndex)
{
// underlying stream is a MemoryStream of the decrypted index, might improve performance with a crypto stream of some sort
IndexReader.Dispose();
}
Reader.Dispose();
Initialized = true;
exc = null;
}