fn HuffmanTreeGroupDecode<AllocU8: Allocator<u8>, AllocU32: Allocator<u32>, AllocHC: Allocator<HuffmanCode>>(
    group_index: i32,
    s: &mut BrotliState<AllocU8, AllocU32, AllocHC>,
    input: &[u8]
) -> BrotliDecoderErrorCode