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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "crc.h"
#include "types.h"

#ifndef TEST_SEED
# define TEST_SEED 0x1234
#endif

#define MAX_BUF   512
#define TEST_SIZE  32

typedef uint32_t(*crc32_func_t) (uint32_t, const uint8_t *, uint64_t);
typedef uint32_t(*crc32_func_t_base) (uint32_t, uint8_t *, uint64_t);

typedef struct func_case {
	char *note;
	crc32_func_t crc32_func_call;
	crc32_func_t_base crc32_ref_call;
} func_case_t;

uint32_t crc32_iscsi_wrap(uint32_t seed, const uint8_t * buf, uint64_t len)
{
	return crc32_iscsi((uint8_t *) buf, len, seed);
}

uint32_t crc32_iscsi_base_wrap(uint32_t seed, uint8_t * buf, uint64_t len)
{
	return crc32_iscsi_base(buf, len, seed);
}

func_case_t test_funcs[] = {
	{"crc32_ieee", crc32_ieee, crc32_ieee_base}
	,
	{"crc32_gzip_refl", crc32_gzip_refl, crc32_gzip_refl_base}
	,
	{"crc32_iscsi", crc32_iscsi_wrap, crc32_iscsi_base_wrap}
};

// Generates pseudo-random data

void rand_buffer(unsigned char *buf, long buffer_size)
{
	long i;
	for (i = 0; i < buffer_size; i++)
		buf[i] = rand();
}

// Test cases
int zeros_test(func_case_t * test_func);

int simple_pattern_test(func_case_t * test_func);

int seeds_sizes_test(func_case_t * test_func);

int eob_test(func_case_t * test_func);

int update_test(func_case_t * test_func);

int verbose = 0;
void *buf_alloc = NULL;

int main(int argc, char *argv[])
{
	int fail = 0, fail_case;
	int i, ret;
	func_case_t *test_func;

	verbose = argc - 1;

	// Align to MAX_BUF boundary
	ret = posix_memalign(&buf_alloc, MAX_BUF, MAX_BUF * TEST_SIZE);
	if (ret) {
		printf("alloc error: Fail");
		return -1;
	}
	srand(TEST_SEED);
	printf("CRC32 Tests\n");

	for (i = 0; i < sizeof(test_funcs) / sizeof(test_funcs[0]); i++) {
		fail_case = 0;
		test_func = &test_funcs[i];

		printf("Test %s ", test_func->note);
		fail_case += zeros_test(test_func);
		fail_case += simple_pattern_test(test_func);
		fail_case += seeds_sizes_test(test_func);
		fail_case += eob_test(test_func);
		fail_case += update_test(test_func);
		printf("Test %s done: %s\n", test_func->note, fail_case ? "Fail" : "Pass");

		if (fail_case) {
			printf("\n%s Failed %d tests\n", test_func->note, fail_case);
			fail++;
		}
	}

	printf("CRC32 Tests all done: %s\n", fail ? "Fail" : "Pass");

	return fail;
}

// Test of all zeros
int zeros_test(func_case_t * test_func)
{
	uint32_t crc, crc_ref;
	int fail = 0;
	unsigned char *buf = NULL;

	buf = (unsigned char *)buf_alloc;
	memset(buf, 0, MAX_BUF * 10);
	crc = test_func->crc32_func_call(TEST_SEED, buf, MAX_BUF * 10);
	crc_ref = test_func->crc32_ref_call(TEST_SEED, buf, MAX_BUF * 10);

	if (crc != crc_ref) {
		fail++;
		printf("\n		   opt   ref\n");
		printf("		 ------ ------\n");
		printf("crc	zero = 0x%8x 0x%8x \n", crc, crc_ref);
	} else
		printf(".");

	return fail;
}

// Another simple test pattern
int simple_pattern_test(func_case_t * test_func)
{
	uint32_t crc, crc_ref;
	int fail = 0;
	unsigned char *buf = NULL;

	buf = (unsigned char *)buf_alloc;
	memset(buf, 0x8a, MAX_BUF);
	crc = test_func->crc32_func_call(TEST_SEED, buf, MAX_BUF);
	crc_ref = test_func->crc32_ref_call(TEST_SEED, buf, MAX_BUF);
	if (crc != crc_ref)
		fail++;
	if (verbose)
		printf("crc  all 8a = 0x%8x 0x%8x\n", crc, crc_ref);
	else
		printf(".");

	return fail;
}

int seeds_sizes_test(func_case_t * test_func)
{
	uint32_t crc, crc_ref;
	int fail = 0;
	int i;
	uint64_t r, s;
	unsigned char *buf = NULL;

	// Do a few random tests
	buf = (unsigned char *)buf_alloc;	//reset buf
	r = rand();
	rand_buffer(buf, MAX_BUF * TEST_SIZE);

	for (i = 0; i < TEST_SIZE; i++) {
		crc = test_func->crc32_func_call(r, buf, MAX_BUF);
		crc_ref = test_func->crc32_ref_call(r, buf, MAX_BUF);
		if (crc != crc_ref)
			fail++;
		if (verbose)
			printf("crc rand%3d = 0x%8x 0x%8x\n", i, crc, crc_ref);
		else
			printf(".");
		buf += MAX_BUF;
	}

	// Do a few random sizes
	buf = (unsigned char *)buf_alloc;	//reset buf
	r = rand();

	for (i = MAX_BUF; i >= 0; i--) {
		crc = test_func->crc32_func_call(r, buf, i);
		crc_ref = test_func->crc32_ref_call(r, buf, i);
		if (crc != crc_ref) {
			fail++;
			printf("fail random size%i 0x%8x 0x%8x\n", i, crc, crc_ref);
		} else
			printf(".");
	}

	// Try different seeds
	for (s = 0; s < 20; s++) {
		buf = (unsigned char *)buf_alloc;	//reset buf

		r = rand();	// just to get a new seed
		rand_buffer(buf, MAX_BUF * TEST_SIZE);	// new pseudo-rand data

		if (verbose)
			printf("seed = 0x%lx\n", r);

		for (i = 0; i < TEST_SIZE; i++) {
			crc = test_func->crc32_func_call(r, buf, MAX_BUF);
			crc_ref = test_func->crc32_ref_call(r, buf, MAX_BUF);
			if (crc != crc_ref)
				fail++;
			if (verbose)
				printf("crc rand%3d = 0x%8x 0x%8x\n", i, crc, crc_ref);
			else
				printf(".");
			buf += MAX_BUF;
		}
	}

	return fail;
}

// Run tests at end of buffer
int eob_test(func_case_t * test_func)
{
	uint32_t crc, crc_ref;
	int fail = 0;
	int i;
	unsigned char *buf = NULL;

	// Null test
	if (0 != test_func->crc32_func_call(0, NULL, 0)) {
		fail++;
		printf("crc null test fail\n");
	}

	buf = (unsigned char *)buf_alloc;	//reset buf
	buf = buf + ((MAX_BUF - 1) * TEST_SIZE);	//Line up TEST_SIZE from end
	for (i = 0; i <= TEST_SIZE; i++) {
		crc = test_func->crc32_func_call(TEST_SEED, buf + i, TEST_SIZE - i);
		crc_ref = test_func->crc32_ref_call(TEST_SEED, buf + i, TEST_SIZE - i);
		if (crc != crc_ref)
			fail++;
		if (verbose)
			printf("crc eob rand%3d = 0x%8x 0x%8x\n", i, crc, crc_ref);
		else
			printf(".");
	}

	return fail;
}

int update_test(func_case_t * test_func)
{
	uint32_t crc, crc_ref;
	int fail = 0;
	int i;
	uint64_t r;
	unsigned char *buf = NULL;

	buf = (unsigned char *)buf_alloc;	//reset buf
	r = rand();
	// Process the whole buf with reference func single call.
	crc_ref = test_func->crc32_ref_call(r, buf, MAX_BUF * TEST_SIZE);
	// Process buf with update method.
	for (i = 0; i < TEST_SIZE; i++) {
		crc = test_func->crc32_func_call(r, buf, MAX_BUF);
		// Update crc seeds and buf pointer.
		r = crc;
		buf += MAX_BUF;
	}

	if (crc != crc_ref)
		fail++;
	if (verbose)
		printf("crc rand%3d = 0x%8x 0x%8x\n", i, crc, crc_ref);
	else
		printf(".");

	return fail;
}
