func FileSequence_Len(id FileSeqId) C.size_t {
	fs, ok := sFileSeqs.Get(id)
	if !ok {
		return 0
	}
	return C.size_t(fs.Len())
}
func FileSequence_Len(id FileSeqId) C.size_t {
	fs, ok := sFileSeqs.Get(id)
	if !ok {
		return 0
	}
	return C.size_t(fs.Len())
}
//export FileSequence_Len