private static bool ReadPakInfo(Stream stream, long size, AesPakCryptoProvider?_aesProvider, [NotNullWhen(true)] out PakInfo?info)
{
var values = Enum.GetValues(typeof(PakInfoSize)).Cast <int>().Where(x => size > x);
// check only versions that can actually be pak files
if (values.Any())
{
var maxSize = values.Max();
using var data = PakMemoryPool.Shared.Rent(maxSize);
stream.ReadWholeBuf(-maxSize, SeekOrigin.End, data.Memory);
foreach (var value in values)
{
if (value > size)
{
continue;
}
var z = data.Memory.Slice(data.Memory.Length - value);
var pak = new PakInfo(z, _aesProvider);
if (pak.IsUnrealPak)
{
info = pak;
return(true);
}
}
}
info = null;
return(false);
}
private async ValueTask InitializeAsync(PakInfo info, CancellationToken cancellationToken = default) => ProcessIndex(await info.ReadIndexAsync(SourceStream, cancellationToken: cancellationToken).ConfigureAwait(false));
private void Initialize(PakInfo info) => ProcessIndex(info.ReadIndex(SourceStream));