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#include <usual/psrandom.h>
#include <usual/string.h>
#include <usual/endian.h>
#include "test_common.h"
#define str_check(a, b) tt_str_op(a, ==, b)
#define tt_stri_op(a, op, b) \
tt_assert_test_type(a, b,#a " "#op " "#b, const char *, \
(strcasecmp(_val1, _val2) op 0), "<%s>")
#define stri_check(a, b) tt_stri_op(a, ==, b)
static const char *mkhex(const uint8_t *src, int len)
{
static char buf[1024 + 1];
static const char hextbl[] = "0123456789abcdef";
int i;
for (i = 0; i < len; i++) {
buf[i*2] = hextbl[src[i] >> 4];
buf[i*2 + 1] = hextbl[src[i] & 15];
}
buf[i*2] = 0;
return buf;
}
/*
* Test if seeding works fine.
*/
static void test_seed(void *ptr)
{
uint32_t val1;
pseudo_random_seed(1, 1);
val1 = pseudo_random();
pseudo_random_seed(2, 2);
pseudo_random();
pseudo_random_seed(1, 1);
int_check(pseudo_random(), val1);
end:
pseudo_random_seed(test_seed1, test_seed2);
}
/*
* Check bytes and algo stability.
*/
static const char *run_bytes(size_t count)
{
uint8_t res[512];
if (count >= sizeof res)
return "NOMEM";
memset(res, 0, sizeof res);
pseudo_random_bytes(res, count);
if (res[count])
return "OVERFLOW";
return mkhex(res, count);
}
static void test_bytes(void *ptr)
{
pseudo_random_seed(1, 1);
str_check(run_bytes(0), "");
str_check(run_bytes(10), "604913fc779c86c8c2eb");
str_check(run_bytes(5), "5d3e8b9dc2");
str_check(run_bytes(4), "47e760b3");
str_check(run_bytes(3), "a09744");
str_check(run_bytes(2), "85d6");
str_check(run_bytes(1), "93");
end:
pseudo_random_seed(test_seed1, test_seed2);
}
/*
* Test random value extraction
*/
static void test_random(void *z)
{
uint8_t buf[8];
uint32_t v1, v2;
pseudo_random_seed(0, 0);
pseudo_random_bytes(buf, 8);
v1 = le32dec(buf);
v2 = le32dec(buf + 4);
pseudo_random_seed(0, 0);
int_check(v1, pseudo_random());
int_check(v2, pseudo_random());
end:
pseudo_random_seed(test_seed1, test_seed2);
}
/*
* Check range limit.
*/
static bool run_range(uint32_t limit)
{
bool res = false;
int i;
for (i = 0; i < 100; i++) {
uint32_t v = pseudo_random_range(limit);
if (limit == 0) {
int_check(v, 0);
} else {
tt_assert(v < limit);
}
}
res = true;
end:
return res;
}
static void test_range(void *z)
{
if (!run_range(1)) goto end;
if (!run_range(0)) goto end;
if (!run_range(255)) goto end;
end:
pseudo_random_seed(test_seed1, test_seed2);
}
/*
* Test if core algo is sane.
*/
// orig code by Sebastiano Vigna
static uint64_t xs128plus_orig(uint64_t s[2])
{
uint64_t s1 = s[0];
const uint64_t s0 = s[1];
s[0] = s0;
s1 ^= s1 << 23; // a
return (s[1] = (s1 ^ s0 ^ (s1 >> 17) ^ (s0 >> 26))) + s0; // b, c
}
static void test_core(void *z)
{
uint64_t i, s_orig[2], s_cur[2], s_1024[16], s_bak[16];
s_orig[0] = s_cur[0] = UINT64_C(0x123456789abcdef1);
s_orig[1] = s_cur[1] = UINT64_C(0xfedcba9876543210);
for (i = 0; i < 100; i++) {
xs128plus_orig(s_orig);
xorshift128plus(&s_cur[0], &s_cur[1]);
tt_assert(s_orig[0] == s_cur[0]);
tt_assert(s_orig[1] == s_cur[1]);
}
for (i = 0; i < 16; i++)
s_1024[i] = xorshift128plus(&s_cur[0], &s_cur[1]);
memcpy(s_bak, s_1024, sizeof s_bak);
xorshift1024plus(s_1024, 0);
tt_assert(s_1024[0] == s_bak[0]);
tt_assert(s_1024[1] != s_bak[1]);
tt_assert(s_1024[1] != s_bak[0]);
tt_assert(s_1024[2] == s_bak[2]);
tt_assert(s_1024[15] == s_bak[15]);
memcpy(s_bak, s_1024, sizeof s_bak);
xorshift1024plus(s_1024, 15);
tt_assert(s_1024[15] == s_bak[15]);
tt_assert(s_1024[0] != s_bak[0]);
tt_assert(s_1024[0] != s_bak[1]);
tt_assert(s_1024[0] != s_bak[15]);
end:
pseudo_random_seed(test_seed1, test_seed2);
}
/*
* Launcher.
*/
struct testcase_t psrandom_tests[] = {
{ "core", test_core },
{ "seed", test_seed },
{ "bytes", test_bytes },
{ "random", test_random },
{ "range", test_range },
END_OF_TESTCASES
};
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