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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include "mem_routines.h"
#include "types.h"

#define TEST_MEM  10*1024*1024
#define TEST_LEN  8*1024
#define RAND_ALIGN   32
#define BORDER_BYTES (5*RAND_ALIGN + 7)

#ifndef RANDOMS
# define RANDOMS 2000
#endif
#ifndef TEST_SEED
# define TEST_SEED 0x1234
#endif

int main(int argc, char *argv[])
{
	int i, j, sign;
	long long r, l;
	void *buf;
	unsigned char *a;
	int failures = 0, ret_neg = 1;

	printf("mem_zero_detect_test %d bytes, %d randoms, seed=0x%x ", TEST_MEM, RANDOMS,
	       TEST_SEED);
	if (posix_memalign(&buf, 64, TEST_MEM)) {
		printf("alloc error: Fail");
		return -1;
	}

	srand(TEST_SEED);

	// Test full zero buffer
	memset(buf, 0, TEST_MEM);
	failures = isal_zero_detect(buf, TEST_MEM);

	if (failures) {
		printf("Fail large buf test\n");
		return failures;
	}
	putchar('.');

	// Test small buffers
	for (i = 0; i < TEST_LEN; i++) {
		failures |= isal_zero_detect(buf, i);
		if (failures) {
			printf("Fail len=%d\n", i);
			return failures;
		}
	}
	putchar('.');

	// Test small buffers near end of alloc region
	a = buf;
	for (i = 0; i < TEST_LEN; i++)
		failures |= isal_zero_detect(&a[TEST_LEN - i], i);

	if (failures) {
		printf("Fail:\n");
		return failures;
	}
	putchar('.');

	// Test for detect non zero
	a[TEST_MEM / 2] = 1;
	ret_neg = isal_zero_detect(a, TEST_MEM);
	if (ret_neg == 0) {
		printf("Fail on not detect\n");
		return -1;
	}
	a[TEST_MEM / 2] = 0;
	putchar('.');

	// Test various non-zero offsets
	for (i = 0; i < BORDER_BYTES; i++) {
		for (j = 0; j < CHAR_BIT; j++) {
			a[i] = 1 << j;
			ret_neg = isal_zero_detect(a, TEST_MEM);
			if (ret_neg == 0) {
				printf("Fail on not detect offsets %d, %d\n", i, j);
				return -1;
			}
			a[i] = 0;
		}
	}
	putchar('.');
	fflush(0);

	// Test random non-zero offsets
	for (i = 0; i < RANDOMS; i++) {
		r = rand();
		r = (r % TEST_LEN) ^ (r & (RAND_ALIGN - 1));
		if (r >= TEST_LEN)
			continue;

		a[r] = 1 << (r & (CHAR_BIT - 1));
		ret_neg = isal_zero_detect(a, TEST_MEM);
		if (ret_neg == 0) {
			printf("Fail on not detect rand %d, e=%lld\n", i, r);
			return -1;
		}
		a[r] = 0;
	}
	putchar('.');
	fflush(0);

	// Test putting non-zero byte at end of buffer
	for (i = 1; i < BORDER_BYTES; i++) {
		for (j = 0; j < CHAR_BIT; j++) {
			a[TEST_MEM - i] = 1 << j;
			ret_neg = isal_zero_detect(a, TEST_MEM);
			if (ret_neg == 0) {
				printf("Fail on not detect rand offset=%d, idx=%d\n", i, j);
				return -1;
			}
			a[TEST_MEM - i] = 0;
		}
	}
	putchar('.');

	// Test various size buffers and non-zero offsets
	for (l = 1; l < TEST_LEN; l++) {
		for (i = 0; i < l + BORDER_BYTES; i++) {
			failures = isal_zero_detect(a, l);

			if (failures) {
				printf("Fail on detect non-zero with l=%lld\n", l);
				return -1;
			}

			a[i] = 1;
			ret_neg = isal_zero_detect(a, l);

			if ((i < l) && (ret_neg == 0)) {
				printf("Fail on non-zero buffer l=%lld err=%d\n", l, i);
				return -1;
			}
			if ((i >= l) && (ret_neg != 0)) {
				printf("Fail on bad pass detect l=%lld err=%d\n", l, i);
				return -1;
			}
			a[i] = 0;
		}
	}
	putchar('.');

	// Test random test size and non-zero error offsets
	for (i = 0; i < RANDOMS; i++) {
		r = rand();
		r = (r % TEST_LEN) ^ (r & (RAND_ALIGN - 1));
		l = r + 1 + (rand() & (CHAR_BIT - 1));
		a[r] = 1 << (r & (CHAR_BIT - 1));
		ret_neg = isal_zero_detect(a, l);
		if (ret_neg == 0) {
			printf("Fail on not detect rand %d, l=%lld, e=%lld\n", i, l, r);
			return -1;
		}
		a[r] = 0;
	}
	putchar('.');
	fflush(0);

	// Test combinations of zero and non-zero buffers
	for (i = 0; i < RANDOMS; i++) {
		r = rand();
		r = (r % TEST_LEN) ^ (r & (RAND_ALIGN - 1));
		sign = rand() & 1 ? 1 : -1;
		l = r + sign * (rand() & (2 * RAND_ALIGN - 1));

		if ((l >= TEST_LEN) || (l < 0) || (r >= TEST_LEN))
			continue;

		a[r] = 1 << (r & (CHAR_BIT - 1));
		ret_neg = isal_zero_detect(a, l);

		if ((r < l) && (ret_neg == 0)) {
			printf("Fail on non-zero rand buffer %d, l=%lld, e=%lld\n", i, l, r);
			return -1;
		}
		if ((r >= l) && (ret_neg != 0)) {
			printf("Fail on bad pass zero detect rand %d, l=%lld, e=%lld\n", i, l,
			       r);
			return -1;
		}

		a[r] = 0;
	}
	putchar('.');
	fflush(0);

	printf(failures == 0 ? " Pass\n" : " Fail\n");
	return failures;
}