struct riff_chunk {
   u8 header[4] str;
   u32 size;
   // Needs union, for LIST header there is no data
   // type: u8[4] str;
   u8 data[size] hex;
};

struct riff_header {
   u8 header[4] str;
   u32 size;
   u8 type[4] str;
};

struct riff {
   struct riff_header header;
   struct riff_chunk chunks[until (false)];
};