fn DecodeContextMap<AllocU8: Allocator<u8>, AllocU32: Allocator<u32>, AllocHC: Allocator<HuffmanCode>>(
    context_map_size: usize,
    is_dist_context_map: bool,
    s: &mut BrotliState<AllocU8, AllocU32, AllocHC>,
    input: &[u8]
) -> BrotliDecoderErrorCode