Brotli Decompression

brotli-decompression.cs

public static Stream DecompressWithBrotli(Stream toDecompress)
{
    MemoryStream decompressedStream = new MemoryStream();
    using (BrotliStream decompressionStream = new BrotliStream(toDecompress, CompressionMode.Decompress))
    {
        decompressionStream.CopyTo(decompressedFileStream);
    }
    return decompressedStream;
}

// Docs: https://docs.microsoft.com/en-us/dotnet/api/system.io.compression.brotlistream?view=netcore-2.1

How does the data get into the variable decompressedStream when it is copied to the undeclared variable decompressedFileStream ?

line 6 should be decompressionStream.CopyTo(decompressedStream);

See for a better example: https://gist.github.com/richlander/85217d18701b74363a46cd42c22220bd