AssetStudio-Genshin-MoYi/AssetStudio/ImportHelper.cs

using Org.Brotli.Dec;
using System.IO;
using System.IO.Compression;

namespace AssetStudio
{
    public static class ImportHelper
    {
        public static FileReader DecompressGZip(FileReader reader)
        {
            using (reader)
            {
                var stream = new MemoryStream();
                using (var gs = new GZipStream(reader.BaseStream, CompressionMode.Decompress))
                {
                    gs.CopyTo(stream);
                }
                stream.Position = 0;
                return new FileReader(reader.FullPath, stream);
            }
        }

        public static FileReader DecompressBrotli(FileReader reader)
        {
            using (reader)
            {
                var stream = new MemoryStream();
                using (var brotliStream = new BrotliInputStream(reader.BaseStream))
                {
                    brotliStream.CopyTo(stream);
                }
                stream.Position = 0;
                return new FileReader(reader.FullPath, stream);
            }
        }
    }
}