private static bool TryReadFileSize(Bhd5BucketEntry entry, Bdt5FileStream bdtStream, out long fileSize)
{
fileSize = 0;
const int sampleLength = 48;
MemoryStream data = bdtStream.Read(entry.FileOffset, sampleLength);
if (entry.IsEncrypted)
{
data = CryptographyUtility.DecryptAesEcb(data, entry.AesKey.Key);
}
string sampleSignature;
if (!TryGetAsciiSignature(data, 4, out sampleSignature) ||
sampleSignature != DcxFile.DcxSignature)
{
return(false);
}
fileSize = DcxFile.DcxSize + DcxFile.ReadCompressedSize(data);
return(true);
}
private static void UnpackBdtFile(Options options)
{
FileNameDictionary dictionary = FileNameDictionary.OpenFromFile(options.InputGameVersion);
string fileNameWithoutExtension = Path.GetFileName(options.InputPath).Replace("Ebl.bdt", "").Replace(".bdt", "");
string archiveName = fileNameWithoutExtension.ToLower();
using (Bdt5FileStream bdtStream = Bdt5FileStream.OpenFile(options.InputPath, FileMode.Open, FileAccess.Read))
{
Bhd5File bhdFile = Bhd5File.Read(
inputStream: DecryptBhdFile(
filePath: Path.ChangeExtension(options.InputPath, "bhd"),
version: options.InputGameVersion),
version: options.InputGameVersion
);
foreach (var bucket in bhdFile.GetBuckets())
{
foreach (var entry in bucket.GetEntries())
{
MemoryStream data;
if (entry.FileSize == 0)
{
long fileSize;
if (!TryReadFileSize(entry, bdtStream, out fileSize))
{
Console.WriteLine($"Unable to determine the length of file '{entry.FileNameHash:D10}'");
continue;
}
entry.FileSize = fileSize;
}
if (entry.IsEncrypted)
{
data = bdtStream.Read(entry.FileOffset, entry.PaddedFileSize);
CryptographyUtility.DecryptAesEcb(data, entry.AesKey.Key, entry.AesKey.Ranges);
data.Position = 0;
data.SetLength(entry.FileSize);
}
else
{
data = bdtStream.Read(entry.FileOffset, entry.FileSize);
}
string fileName;
string dataExtension = GetDataExtension(data);
bool fileNameFound = dictionary.TryGetFileName(entry.FileNameHash, archiveName, out fileName);
if (!fileNameFound)
{
fileNameFound = dictionary.TryGetFileName(entry.FileNameHash, archiveName, dataExtension, out fileName);
}
string extension;
if (fileNameFound)
{
extension = Path.GetExtension(fileName);
if (dataExtension == ".dcx" && extension != ".dcx")
{
extension = ".dcx";
fileName += ".dcx";
}
}
else
{
extension = dataExtension;
fileName = $"{entry.FileNameHash:D10}_{fileNameWithoutExtension}{extension}";
}
if (extension == ".enc")
{
byte[] decryptionKey;
if (DecryptionKeys.TryGetAesFileKey(Path.GetFileName(fileName), out decryptionKey))
{
EncFile encFile = EncFile.ReadEncFile(data, decryptionKey);
data = encFile.Data;
fileName = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));
extension = Path.GetExtension(fileName);
}
else
{
Debug.WriteLine($"No decryption key for file \'{fileName}\' found.");
}
}
if (extension == ".dcx")
{
DcxFile dcxFile = DcxFile.Read(data);
data = new MemoryStream(dcxFile.Decompress());
fileName = Path.Combine(Path.GetDirectoryName(fileName), Path.GetFileNameWithoutExtension(fileName));
if (fileNameFound)
{
extension = Path.GetExtension(fileName);
}
else
{
extension = GetDataExtension(data);
fileName += extension;
}
}
if (extension == ".bnd")
{
UnpackBnd3File(data, options.OutputPath);
continue; // don't actually unpack bnds
}
Debug.WriteLine(
"{0}\t{1}\t{2}\t{3}\t{4}\t{5}\t{6}\t{7}\t{8}",
fileNameWithoutExtension,
fileName,
extension,
entry.FileNameHash,
entry.FileOffset,
entry.FileSize,
entry.PaddedFileSize,
entry.IsEncrypted,
fileNameFound);
string newFileNamePath = Path.Combine(options.OutputPath, fileName);
Directory.CreateDirectory(Path.GetDirectoryName(newFileNamePath));
File.WriteAllBytes(newFileNamePath, data.ToArray());
}
}
}
}
private bool unpackBDT(string name, string key, Progress progress, bool required)
{
if (stop)
{
return(true);
}
string bhdPath = gameDir + "\\" + name + ".bhd";
string bdtPath = gameDir + "\\" + name + ".bdt";
if (!(File.Exists(bhdPath) && File.Exists(bdtPath)))
{
if (required)
{
Error = "File not found:\n" + (File.Exists(bhdPath) ? bdtPath : bhdPath);
return(false);
}
else
{
return(true);
}
}
Status = "Unpacking " + name + "...";
Bhd5File bhd;
try
{
using (MemoryStream bhdStream = CryptographyUtility.DecryptRsa(bhdPath, key))
{
bhd = Bhd5File.Read(bhdStream, GameVersion.DarkSouls3);
}
}
catch (Exception ex)
{
Error = $"Failed to open BHD:\n{bhdPath}\n\n{ex}";
return(false);
}
int fileCount = 0;
foreach (Bhd5Bucket bucket in bhd.GetBuckets())
{
fileCount += bucket.GetEntries().Count();
}
progress.Value = 0;
progress.Max = fileCount;
try
{
using (Bdt5FileStream bdtStream = Bdt5FileStream.OpenFile(bdtPath, FileMode.Open, FileAccess.Read))
{
foreach (Bhd5Bucket bucket in bhd.GetBuckets())
{
foreach (Bhd5BucketEntry entry in bucket.GetEntries())
{
if (stop)
{
return(true);
}
if (entry.FileSize == 0)
{
MemoryStream header = bdtStream.Read(entry.FileOffset, 48);
if (entry.IsEncrypted)
{
MemoryStream disposer = header;
header = CryptographyUtility.DecryptAesEcb(header, entry.AesKey.Key);
disposer.Dispose();
}
byte[] signatureBytes = new byte[4];
header.Read(signatureBytes, 0, 4);
string signature = ASCII.GetString(signatureBytes);
if (signature != DcxFile.DcxSignature)
{
Error = "Zero-length entry is not DCX in BHD:\n" + bhdPath;
return(false);
}
header.Position = 0;
entry.FileSize = DcxFile.DcxSize + DcxFile.ReadCompressedSize(header);
header.Dispose();
}
MemoryStream data;
if (entry.IsEncrypted)
{
data = bdtStream.Read(entry.FileOffset, entry.PaddedFileSize);
CryptographyUtility.DecryptAesEcb(data, entry.AesKey.Key, entry.AesKey.Ranges);
data.Position = 0;
data.SetLength(entry.FileSize);
}
else
{
data = bdtStream.Read(entry.FileOffset, entry.FileSize);
}
string path;
if (ArchiveDictionary.GetPath(entry.FileNameHash, out path))
{
path = gameDir + path.Replace('/', '\\');
}
else
{
path = $"{gameDir}\\_unknown\\{name}_{entry.FileNameHash:D10}";
}
try
{
Directory.CreateDirectory(Path.GetDirectoryName(path));
File.WriteAllBytes(path, data.ToArray());
}
catch (Exception ex)
{
Error = $"Failed to write file:\n{path}\n\n{ex}";
return(false);
}
data.Dispose();
progress.Value++;
}
}
}
}
catch (Exception ex)
{
Error = $"Failed to unpack BDT:\n{bdtPath}\n\n{ex}";
return(false);
}
return(true);
}