trezor-firmware/nem_serialize.h

#define serialize_u32(data)           + sizeof(uint32_t)
#define serialize_u64(data)           + sizeof(uint64_t)
#define serialize_write(data, length) + (length)

if (!nem_can_write(ctx, NEM_SERIALIZE)) {
	return false;
}

#undef serialize_u32
#undef serialize_u64
#undef serialize_write

#define serialize_u32(data)           nem_write_u32(ctx, (data));
#define serialize_u64(data)           nem_write_u64(ctx, (data));
#define serialize_write(data, length) nem_write(ctx, (data), (length));

NEM_SERIALIZE

#undef serialize_u32
#undef serialize_u64
#undef serialize_write

#undef NEM_SERIALIZE