juju.re/jujure/static/brachiosaure/check_serial.c

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uint64_t check_serial(void* user_digest, int64_t serial, int32_t size)
{
void* buff = NULL;
int64_t res;
if (user_digest == NULL || serial == NULL)
return 0;
something_interesting(user_digest, user_digest, &buff, size);
res = memcmp(serial, buff, size * size) == 0;
free(buff);
return res;
}