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#include<stdio.h>
#include<stdint.h>
#include<string.h>
#include<stdlib.h>
#include "raid.h"
#include "test.h"

#define TEST_SOURCES 16
#define TEST_LEN     1024
#define TEST_MEM ((TEST_SOURCES + 2)*(TEST_LEN))
#ifndef TEST_SEED
# define TEST_SEED 0x1234
#endif

int ref_multi_pq(int vects, int len, void **array)
{
	int i, j;
	unsigned char p, q, s;
	unsigned char **src = (unsigned char **)array;

	for (i = 0; i < len; i++) {
		q = p = src[vects - 3][i];

		for (j = vects - 4; j >= 0; j--) {
			p ^= s = src[j][i];
			q = s ^ ((q << 1) ^ ((q & 0x80) ? 0x1d : 0));	// mult by GF{2}
		}

		src[vects - 2][i] = p;	// second to last pointer is p
		src[vects - 1][i] = q;	// last pointer is q
	}
	return 0;
}

// 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();
}

int main(int argc, char *argv[])
{
	int i, j, k, ret, fail = 0;
	void *buffs[TEST_SOURCES + 2];
	char c;
	char *tmp_buf[TEST_SOURCES + 2];
	int serr, lerr;

	printf("Test pq_check_test %d sources X %d bytes\n", TEST_SOURCES, TEST_LEN);

	srand(TEST_SEED);

	// Allocate the arrays
	for (i = 0; i < TEST_SOURCES + 2; i++) {
		void *buf;
		if (posix_memalign(&buf, 16, TEST_LEN)) {
			printf("alloc error: Fail");
			return 1;
		}
		buffs[i] = buf;
	}

	// Test of all zeros
	for (i = 0; i < TEST_SOURCES + 2; i++)
		memset(buffs[i], 0, TEST_LEN);

	ref_multi_pq(TEST_SOURCES + 2, TEST_LEN, buffs);
	ret = pq_check(TEST_SOURCES + 2, TEST_LEN, buffs);
	if (ret != 0) {
		fail++;
		printf("\nfail zero test %d\n", ret);
	}

	((char *)(buffs[0]))[TEST_LEN - 2] = 0x7;	// corrupt buffer
	ret = pq_check(TEST_SOURCES + 2, TEST_LEN, buffs);
	if (ret == 0) {
		fail++;
		printf("\nfail corrupt buffer test %d\n", ret);
	}
	((char *)(buffs[0]))[TEST_LEN - 2] = 0;	// un-corrupt buffer

	// Test corrupted buffer any location on all sources
	for (j = 0; j < TEST_SOURCES + 2; j++) {
		for (i = TEST_LEN - 1; i >= 0; i--) {
			((char *)buffs[j])[i] = 0x5;	// corrupt buffer
			ret = pq_check(TEST_SOURCES + 2, TEST_LEN, buffs);
			if (ret == 0) {
				fail++;
				printf("\nfail corrupt zero buffer test j=%d, i=%d\n", j, i);
				return 1;
			}
			((char *)buffs[j])[i] = 0;	// un-corrupt buffer
		}
		putchar('.');
	}

	// Test rand1
	for (i = 0; i < TEST_SOURCES + 2; i++)
		rand_buffer(buffs[i], TEST_LEN);

	ref_multi_pq(TEST_SOURCES + 2, TEST_LEN, buffs);
	ret = pq_check(TEST_SOURCES + 2, TEST_LEN, buffs);
	if (ret != 0) {
		fail++;
		printf("fail first rand test %d\n", ret);
	}

	c = ((char *)(buffs[0]))[TEST_LEN - 2];
	((char *)(buffs[0]))[TEST_LEN - 2] = c ^ 0x1;
	ret = pq_check(TEST_SOURCES + 2, TEST_LEN, buffs);
	if (ret == 0) {
		fail++;
		printf("\nFail corrupt buffer test, passed when should have failed\n");
	}
	((char *)(buffs[0]))[TEST_LEN - 2] = c;	// un-corrupt buffer

	// Test corrupted buffer any location on all sources w/ random data
	for (j = 0; j < TEST_SOURCES + 2; j++) {
		for (i = TEST_LEN - 1; i >= 0; i--) {
			// Check it still passes
			ret = pq_check(TEST_SOURCES + 2, TEST_LEN, buffs);
			if (ret != 0) {	// should pass
				fail++;
				printf
				    ("\nFail rand test with un-corrupted buffer j=%d, i=%d\n",
				     j, i);
				return 1;
			}
			c = ((char *)buffs[j])[i];
			((char *)buffs[j])[i] = c ^ 1;	// corrupt buffer
			ret = pq_check(TEST_SOURCES + 2, TEST_LEN, buffs);
			if (ret == 0) {	// Check it now fails
				fail++;
				printf("\nfail corrupt buffer test j=%d, i=%d\n", j, i);
				return 1;
			}
			((char *)buffs[j])[i] = c;	// un-corrupt buffer
		}
		putchar('.');
	}

	// Test various number of sources, full length
	for (j = 4; j <= TEST_SOURCES + 2; j++) {
		// New random data
		for (i = 0; i < j; i++)
			rand_buffer(buffs[i], TEST_LEN);

		// Generate p,q parity for this number of sources
		ref_multi_pq(j, TEST_LEN, buffs);

		// Set errors up in each source and len position
		for (i = 0; i < j; i++) {
			for (k = 0; k < TEST_LEN; k++) {
				// See if it still passes
				ret = pq_check(j, TEST_LEN, buffs);
				if (ret != 0) {	// Should pass
					printf("\nfail rand fixed len test %d sources\n", j);
					fail++;
					return 1;
				}

				c = ((char *)buffs[i])[k];
				((char *)buffs[i])[k] = c ^ 1;	// corrupt buffer

				ret = pq_check(j, TEST_LEN, buffs);
				if (ret == 0) {	// Should fail
					printf
					    ("\nfail rand fixed len test corrupted buffer %d sources\n",
					     j);
					fail++;
					return 1;
				}
				((char *)buffs[i])[k] = c;	// un-corrupt buffer
			}
		}
		putchar('.');
	}

	fflush(0);

	// Test various number of sources and len
	k = 16;
	while (k <= TEST_LEN) {
		char *tmp;
		for (j = 4; j <= TEST_SOURCES + 2; j++) {
			for (i = 0; i < j; i++)
				rand_buffer(buffs[i], k);

			// Generate p,q parity for this number of sources
			ref_multi_pq(j, k, buffs);

			// Inject errors at various source and len positions
			for (lerr = 0; lerr < k; lerr++) {
				for (serr = 0; serr < j; serr++) {
					// See if it still passes
					ret = pq_check(j, k, buffs);
					if (ret != 0) {	// Should pass
						printf
						    ("\nfail rand var src, len test %d sources, len=%d\n",
						     j, k);
						fail++;
						return 1;
					}

					tmp = (char *)buffs[serr];
					c = tmp[lerr];
					((char *)buffs[serr])[lerr] = c ^ 1;	// corrupt buffer

					ret = pq_check(j, k, buffs);
					if (ret == 0) {	// Should fail
						printf
						    ("\nfail rand var src, len test corrupted buffer "
						     "%d sources, len=%d, ret=%d\n", j, k,
						     ret);
						fail++;
						return 1;
					}
					((char *)buffs[serr])[lerr] = c;	// un-corrupt buffer
				}
			}
			putchar('.');
			fflush(0);
		}
		k += 16;
	}

	// Test at the end of buffer
	for (i = 0; i < TEST_LEN; i += 16) {
		for (j = 0; j < TEST_SOURCES + 2; j++) {
			rand_buffer(buffs[j], TEST_LEN - i);
			tmp_buf[j] = (char *)buffs[j] + i;
		}

		pq_gen_base(TEST_SOURCES + 2, TEST_LEN - i, (void *)tmp_buf);

		// Test good data
		ret = pq_check(TEST_SOURCES + 2, TEST_LEN - i, (void *)tmp_buf);
		if (ret != 0) {
			printf("fail end test - offset: %d, len: %d\n", i, TEST_LEN - i);
			fail++;
			return 1;
		}
		// Test bad data
		for (serr = 0; serr < TEST_SOURCES + 2; serr++) {
			for (lerr = 0; lerr < (TEST_LEN - i); lerr++) {
				c = tmp_buf[serr][lerr];
				tmp_buf[serr][lerr] = c ^ 1;

				ret =
				    pq_check(TEST_SOURCES + 2, TEST_LEN - i, (void *)tmp_buf);
				if (ret == 0) {
					printf("fail end test corrupted buffer - "
					       "offset: %d, len: %d, ret: %d\n", i,
					       TEST_LEN - i, ret);
					fail++;
					return 1;
				}

				tmp_buf[serr][lerr] = c;
			}
		}

		putchar('.');
		fflush(0);
	}

	if (fail == 0)
		printf("Pass\n");

	return fail;

}