/// <summary>
/// Initialize table with decryption constants
/// </summary>
/// <param name="data"></param>
/// <param name="game"></param>
/// <param name="flags"></param>
/// <param name="truth"></param>
/// <param name="multiplier"></param>
/// <param name="divisor"></param>
public PKGTBL(Span <byte> data, string game, IDTableFlags flags, byte[] truth, ulong multiplier, ulong divisor)
{
if (flags != IDTableFlags.None)
{
var size = BinaryPrimitives.ReadUInt32LittleEndian(data);
data = Read(data.Slice(4), game, (uint)data.Length - 4, size, flags, truth, multiplier, divisor);
}
Buffer = new Memory <byte>(data.ToArray());
if (data.GetDataType() == DataType.PackageInfo)
{
PackageInfo = new PKGINFO(data);
// There's extra shit that I can't parse yet because the format is highly dependent on arbitrary values.
Header = new IDTableHeader
{
Offset = PackageInfo.Resource.Pointers[1] + PackageInfo.InfoTable.Header.TextPointer + SizeHelper.SizeOf <BTIFHeader>()
};
Entries = PackageInfo.InfoTable.Entries.Select(x => new IDTableEntry
{
PathOffset = x.NameOffset,
OriginalPathOffset = -1,
Flags = x.Flags,
UniqueId = x.Checksum,
CompressedSize = x.CompressedSize,
DecompressedSize = x.DecompressedSize,
Padding1 = PackageInfo.InfoTable.UnknownBuffer[x.UnknownIndex],
Padding2 = PackageInfo.InfoTable.UnknownBuffer[x.UnknownIndex + 1]
}).ToArray();
}
else
{
Header = MemoryMarshal.Read <IDTableHeader>(data);
Entries = MemoryMarshal.Cast <byte, IDTableEntry>(data.Slice(Header.Offset, Header.Count * SizeHelper.SizeOf <IDTableEntry>())).ToArray();
}
}
/// <summary>
/// Read a file with decryption constants
/// </summary>
/// <param name="file"></param>
/// <param name="game"></param>
/// <param name="compressedSize"></param>
/// <param name="size"></param>
/// <param name="flags"></param>
/// <param name="truth"></param>
/// <param name="multiplier"></param>
/// <param name="divisor"></param>
/// <returns></returns>
public static Span <byte> Read(Span <byte> file, string game, uint compressedSize, uint size, IDTableFlags flags, byte[] truth, ulong multiplier, ulong divisor)
{
if (compressedSize > file.Length)
{
Logger.Warn("PKGINFO", "Compressed Size is larger than actual file! The package info might have drifted from the saved files. Please verify game data!");
}
if (game == "VenusVacation" && file.IsKnown())
{
return(file);
}
if (flags.HasFlag(IDTableFlags.Encrypted) && (game != "VenusVacation" || flags.HasFlag(IDTableFlags.Compressed)))
{
var key = XOREncryption.Xor(size, truth, multiplier, divisor);
file = XOREncryption.Crypt(file, key);
}
// ReSharper disable once InvertIf
if (flags.HasFlag(IDTableFlags.Compressed) && file[4] == 0x78)
{
try
{
var decompressedData = Stream8000Compression.Decompress(file, new CompressionOptions {
Length = size
});
if (decompressedData.Length != 0)
{
file = decompressedData;
}
}
catch (Exception e)
{
Logger.Error("PKGINFO", e);
}
}
return(file);
}
