deb-libisal/erasure_code/erasure_code_test.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>		// for memset, memcmp
#include "erasure_code.h"
#include "types.h"

#define TEST_LEN 8192
#define TEST_SIZE (TEST_LEN/2)

#ifndef TEST_SOURCES
# define TEST_SOURCES  127
#endif
#ifndef RANDOMS
# define RANDOMS 200
#endif

#define MMAX TEST_SOURCES
#define KMAX TEST_SOURCES

#define EFENCE_TEST_MIN_SIZE 16
#define EFENCE_TEST_MAX_SIZE EFENCE_TEST_MIN_SIZE + 0x100

#ifdef EC_ALIGNED_ADDR
// Define power of 2 range to check ptr, len alignment
# define PTR_ALIGN_CHK_B 0
# define LEN_ALIGN_CHK_B 0	// 0 for aligned only
#else
// Define power of 2 range to check ptr, len alignment
# define PTR_ALIGN_CHK_B 32
# define LEN_ALIGN_CHK_B 32	// 0 for aligned only
#endif

#ifndef TEST_SEED
#define TEST_SEED 11
#endif

typedef unsigned char u8;

void dump(unsigned char *buf, int len)
{
	int i;
	for (i = 0; i < len;) {
		printf(" %2x", 0xff & buf[i++]);
		if (i % 32 == 0)
			printf("\n");
	}
	printf("\n");
}

void dump_matrix(unsigned char **s, int k, int m)
{
	int i, j;
	for (i = 0; i < k; i++) {
		for (j = 0; j < m; j++) {
			printf(" %2x", s[i][j]);
		}
		printf("\n");
	}
	printf("\n");
}

void dump_u8xu8(unsigned char *s, int k, int m)
{
	int i, j;
	for (i = 0; i < k; i++) {
		for (j = 0; j < m; j++) {
			printf(" %2x", 0xff & s[j + (i * m)]);
		}
		printf("\n");
	}
	printf("\n");
}

// Generate Random errors
static void gen_err_list(unsigned char *src_err_list,
			 unsigned char *src_in_err, int *pnerrs, int *pnsrcerrs, int k, int m)
{
	int i, err;
	int nerrs = 0, nsrcerrs = 0;

	for (i = 0, nerrs = 0, nsrcerrs = 0; i < m && nerrs < m - k; i++) {
		err = 1 & rand();
		src_in_err[i] = err;
		if (err) {
			src_err_list[nerrs++] = i;
			if (i < k) {
				nsrcerrs++;
			}
		}
	}
	if (nerrs == 0) {	// should have at least one error
		while ((err = (rand() % KMAX)) >= m) ;
		src_err_list[nerrs++] = err;
		src_in_err[err] = 1;
		if (err < k)
			nsrcerrs = 1;
	}
	*pnerrs = nerrs;
	*pnsrcerrs = nsrcerrs;
	return;
}

#define NO_INVERT_MATRIX -2
// Generate decode matrix from encode matrix
static int gf_gen_decode_matrix(unsigned char *encode_matrix,
				unsigned char *decode_matrix,
				unsigned char *invert_matrix,
				unsigned int *decode_index,
				unsigned char *src_err_list,
				unsigned char *src_in_err,
				int nerrs, int nsrcerrs, int k, int m)
{
	int i, j, p;
	int r;
	unsigned char *backup, *b, s;
	int incr = 0;

	b = malloc(MMAX * KMAX);
	backup = malloc(MMAX * KMAX);

	if (b == NULL || backup == NULL) {
		printf("Test failure! Error with malloc\n");
		free(b);
		free(backup);
		return -1;
	}
	// Construct matrix b by removing error rows
	for (i = 0, r = 0; i < k; i++, r++) {
		while (src_in_err[r])
			r++;
		for (j = 0; j < k; j++) {
			b[k * i + j] = encode_matrix[k * r + j];
			backup[k * i + j] = encode_matrix[k * r + j];
		}
		decode_index[i] = r;
	}
	incr = 0;
	while (gf_invert_matrix(b, invert_matrix, k) < 0) {
		if (nerrs == (m - k)) {
			free(b);
			free(backup);
			printf("BAD MATRIX\n");
			return NO_INVERT_MATRIX;
		}
		incr++;
		memcpy(b, backup, MMAX * KMAX);
		for (i = nsrcerrs; i < nerrs - nsrcerrs; i++) {
			if (src_err_list[i] == (decode_index[k - 1] + incr)) {
				// skip the erased parity line
				incr++;
				continue;
			}
		}
		if (decode_index[k - 1] + incr >= m) {
			free(b);
			free(backup);
			printf("BAD MATRIX\n");
			return NO_INVERT_MATRIX;
		}
		decode_index[k - 1] += incr;
		for (j = 0; j < k; j++)
			b[k * (k - 1) + j] = encode_matrix[k * decode_index[k - 1] + j];

	};

	for (i = 0; i < nsrcerrs; i++) {
		for (j = 0; j < k; j++) {
			decode_matrix[k * i + j] = invert_matrix[k * src_err_list[i] + j];
		}
	}
	/* src_err_list from encode_matrix * invert of b for parity decoding */
	for (p = nsrcerrs; p < nerrs; p++) {
		for (i = 0; i < k; i++) {
			s = 0;
			for (j = 0; j < k; j++)
				s ^= gf_mul(invert_matrix[j * k + i],
					    encode_matrix[k * src_err_list[p] + j]);

			decode_matrix[k * p + i] = s;
		}
	}
	free(b);
	free(backup);
	return 0;
}

int main(int argc, char *argv[])
{
	int re = 0;
	int i, j, p, rtest, m, k;
	int nerrs, nsrcerrs;
	void *buf;
	unsigned int decode_index[MMAX];
	unsigned char *temp_buffs[TEST_SOURCES], *buffs[TEST_SOURCES];
	unsigned char *encode_matrix, *decode_matrix, *invert_matrix, *g_tbls;
	unsigned char src_in_err[TEST_SOURCES], src_err_list[TEST_SOURCES];
	unsigned char *recov[TEST_SOURCES];

	int rows, align, size;
	unsigned char *efence_buffs[TEST_SOURCES];
	unsigned int offset;
	u8 *ubuffs[TEST_SOURCES];
	u8 *temp_ubuffs[TEST_SOURCES];

	printf("erasure_code_test: %dx%d ", TEST_SOURCES, TEST_LEN);
	srand(TEST_SEED);

	// Allocate the arrays
	for (i = 0; i < TEST_SOURCES; i++) {
		if (posix_memalign(&buf, 64, TEST_LEN)) {
			printf("alloc error: Fail");
			return -1;
		}
		buffs[i] = buf;
	}

	for (i = 0; i < TEST_SOURCES; i++) {
		if (posix_memalign(&buf, 64, TEST_LEN)) {
			printf("alloc error: Fail");
			return -1;
		}
		temp_buffs[i] = buf;
	}

	// Test erasure code by encode and recovery

	encode_matrix = malloc(MMAX * KMAX);
	decode_matrix = malloc(MMAX * KMAX);
	invert_matrix = malloc(MMAX * KMAX);
	g_tbls = malloc(KMAX * TEST_SOURCES * 32);
	if (encode_matrix == NULL || decode_matrix == NULL
	    || invert_matrix == NULL || g_tbls == NULL) {
		printf("Test failure! Error with malloc\n");
		return -1;
	}
	// Pick a first test
	m = 9;
	k = 5;
	if (m > MMAX || k > KMAX)
		return -1;

	// Make random data
	for (i = 0; i < k; i++)
		for (j = 0; j < TEST_LEN; j++)
			buffs[i][j] = rand();

	// Generate encode matrix encode_matrix
	// The matrix generated by gf_gen_rs_matrix
	// is not always invertable.
	gf_gen_rs_matrix(encode_matrix, m, k);

	// Generate g_tbls from encode matrix encode_matrix
	ec_init_tables(k, m - k, &encode_matrix[k * k], g_tbls);

	// Perform matrix dot_prod for EC encoding
	// using g_tbls from encode matrix encode_matrix
	ec_encode_data(TEST_LEN, k, m - k, g_tbls, buffs, &buffs[k]);

	// Choose random buffers to be in erasure
	memset(src_in_err, 0, TEST_SOURCES);
	gen_err_list(src_err_list, src_in_err, &nerrs, &nsrcerrs, k, m);

	// Generate decode matrix
	re = gf_gen_decode_matrix(encode_matrix, decode_matrix,
				  invert_matrix, decode_index, src_err_list, src_in_err,
				  nerrs, nsrcerrs, k, m);
	if (re != 0) {
		printf("Fail to gf_gen_decode_matrix\n");
		return -1;
	}
	// Pack recovery array as list of valid sources
	// Its order must be the same as the order
	// to generate matrix b in gf_gen_decode_matrix
	for (i = 0; i < k; i++) {
		recov[i] = buffs[decode_index[i]];
	}

	// Recover data
	ec_init_tables(k, nerrs, decode_matrix, g_tbls);
	ec_encode_data(TEST_LEN, k, nerrs, g_tbls, recov, &temp_buffs[k]);
	for (i = 0; i < nerrs; i++) {

		if (0 != memcmp(temp_buffs[k + i], buffs[src_err_list[i]], TEST_LEN)) {
			printf("Fail error recovery (%d, %d, %d)\n", m, k, nerrs);
			printf(" - erase list = ");
			for (j = 0; j < nerrs; j++)
				printf(" %d", src_err_list[j]);
			printf(" - Index = ");
			for (p = 0; p < k; p++)
				printf(" %d", decode_index[p]);
			printf("\nencode_matrix:\n");
			dump_u8xu8((u8 *) encode_matrix, m, k);
			printf("inv b:\n");
			dump_u8xu8((u8 *) invert_matrix, k, k);
			printf("\ndecode_matrix:\n");
			dump_u8xu8((u8 *) decode_matrix, m, k);
			printf("recov %d:", src_err_list[i]);
			dump(temp_buffs[k + i], 25);
			printf("orig   :");
			dump(buffs[src_err_list[i]], 25);
			return -1;
		}
	}

	// Pick a first test
	m = 9;
	k = 5;
	if (m > MMAX || k > KMAX)
		return -1;

	// Make random data
	for (i = 0; i < k; i++)
		for (j = 0; j < TEST_LEN; j++)
			buffs[i][j] = rand();

	// The matrix generated by gf_gen_cauchy1_matrix
	// is always invertable.
	gf_gen_cauchy1_matrix(encode_matrix, m, k);

	// Generate g_tbls from encode matrix encode_matrix
	ec_init_tables(k, m - k, &encode_matrix[k * k], g_tbls);

	// Perform matrix dot_prod for EC encoding
	// using g_tbls from encode matrix encode_matrix
	ec_encode_data(TEST_LEN, k, m - k, g_tbls, buffs, &buffs[k]);

	// Choose random buffers to be in erasure
	memset(src_in_err, 0, TEST_SOURCES);
	gen_err_list(src_err_list, src_in_err, &nerrs, &nsrcerrs, k, m);

	// Generate decode matrix
	re = gf_gen_decode_matrix(encode_matrix, decode_matrix,
				  invert_matrix, decode_index, src_err_list, src_in_err,
				  nerrs, nsrcerrs, k, m);
	if (re != 0) {
		printf("Fail to gf_gen_decode_matrix\n");
		return -1;
	}
	// Pack recovery array as list of valid sources
	// Its order must be the same as the order
	// to generate matrix b in gf_gen_decode_matrix
	for (i = 0; i < k; i++) {
		recov[i] = buffs[decode_index[i]];
	}

	// Recover data
	ec_init_tables(k, nerrs, decode_matrix, g_tbls);
	ec_encode_data(TEST_LEN, k, nerrs, g_tbls, recov, &temp_buffs[k]);
	for (i = 0; i < nerrs; i++) {

		if (0 != memcmp(temp_buffs[k + i], buffs[src_err_list[i]], TEST_LEN)) {
			printf("Fail error recovery (%d, %d, %d)\n", m, k, nerrs);
			printf(" - erase list = ");
			for (j = 0; j < nerrs; j++)
				printf(" %d", src_err_list[j]);
			printf(" - Index = ");
			for (p = 0; p < k; p++)
				printf(" %d", decode_index[p]);
			printf("\nencode_matrix:\n");
			dump_u8xu8((u8 *) encode_matrix, m, k);
			printf("inv b:\n");
			dump_u8xu8((u8 *) invert_matrix, k, k);
			printf("\ndecode_matrix:\n");
			dump_u8xu8((u8 *) decode_matrix, m, k);
			printf("recov %d:", src_err_list[i]);
			dump(temp_buffs[k + i], 25);
			printf("orig   :");
			dump(buffs[src_err_list[i]], 25);
			return -1;
		}
	}

	// Do more random tests
	for (rtest = 0; rtest < RANDOMS; rtest++) {
		while ((m = (rand() % MMAX)) < 2) ;
		while ((k = (rand() % KMAX)) >= m || k < 1) ;

		if (m > MMAX || k > KMAX)
			continue;

		// Make random data
		for (i = 0; i < k; i++)
			for (j = 0; j < TEST_LEN; j++)
				buffs[i][j] = rand();

		// The matrix generated by gf_gen_cauchy1_matrix
		// is always invertable.
		gf_gen_cauchy1_matrix(encode_matrix, m, k);

		// Make parity vects
		// Generate g_tbls from encode matrix a
		ec_init_tables(k, m - k, &encode_matrix[k * k], g_tbls);
		// Perform matrix dot_prod for EC encoding
		// using g_tbls from encode matrix a
		ec_encode_data(TEST_LEN, k, m - k, g_tbls, buffs, &buffs[k]);

		// Random errors
		memset(src_in_err, 0, TEST_SOURCES);
		gen_err_list(src_err_list, src_in_err, &nerrs, &nsrcerrs, k, m);

		// Generate decode matrix
		re = gf_gen_decode_matrix(encode_matrix, decode_matrix,
					  invert_matrix, decode_index, src_err_list,
					  src_in_err, nerrs, nsrcerrs, k, m);
		if (re != 0) {
			printf("Fail to gf_gen_decode_matrix\n");
			return -1;
		}
		// Pack recovery array as list of valid sources
		// Its order must be the same as the order
		// to generate matrix b in gf_gen_decode_matrix
		for (i = 0; i < k; i++) {
			recov[i] = buffs[decode_index[i]];
		}

		// Recover data
		ec_init_tables(k, nerrs, decode_matrix, g_tbls);
		ec_encode_data(TEST_LEN, k, nerrs, g_tbls, recov, &temp_buffs[k]);

		for (i = 0; i < nerrs; i++) {

			if (0 != memcmp(temp_buffs[k + i], buffs[src_err_list[i]], TEST_LEN)) {
				printf("Fail error recovery (%d, %d, %d) - ", m, k, nerrs);
				printf(" - erase list = ");
				for (j = 0; j < nerrs; j++)
					printf(" %d", src_err_list[j]);
				printf(" - Index = ");
				for (p = 0; p < k; p++)
					printf(" %d", decode_index[p]);
				printf("\nencode_matrix:\n");
				dump_u8xu8((u8 *) encode_matrix, m, k);
				printf("inv b:\n");
				dump_u8xu8((u8 *) invert_matrix, k, k);
				printf("\ndecode_matrix:\n");
				dump_u8xu8((u8 *) decode_matrix, m, k);
				printf("orig data:\n");
				dump_matrix(buffs, m, 25);
				printf("orig   :");
				dump(buffs[src_err_list[i]], 25);
				printf("recov %d:", src_err_list[i]);
				dump(temp_buffs[k + i], 25);
				return -1;
			}
		}
		putchar('.');
	}

	// Run tests at end of buffer for Electric Fence
	k = 16;
	align = (LEN_ALIGN_CHK_B != 0) ? 1 : 16;
	if (k > KMAX)
		return -1;

	for (rows = 1; rows <= 16; rows++) {
		m = k + rows;
		if (m > MMAX)
			return -1;

		// Make random data
		for (i = 0; i < k; i++)
			for (j = 0; j < TEST_LEN; j++)
				buffs[i][j] = rand();

		for (size = EFENCE_TEST_MIN_SIZE; size <= EFENCE_TEST_MAX_SIZE; size += align) {
			for (i = 0; i < m; i++) {	// Line up TEST_SIZE from end
				efence_buffs[i] = buffs[i] + TEST_LEN - size;
			}

			// The matrix generated by gf_gen_cauchy1_matrix
			// is always invertable.
			gf_gen_cauchy1_matrix(encode_matrix, m, k);

			// Make parity vects
			// Generate g_tbls from encode matrix a
			ec_init_tables(k, m - k, &encode_matrix[k * k], g_tbls);
			// Perform matrix dot_prod for EC encoding
			// using g_tbls from encode matrix a
			ec_encode_data(size, k, m - k, g_tbls, efence_buffs, &efence_buffs[k]);

			// Random errors
			memset(src_in_err, 0, TEST_SOURCES);
			gen_err_list(src_err_list, src_in_err, &nerrs, &nsrcerrs, k, m);

			// Generate decode matrix
			re = gf_gen_decode_matrix(encode_matrix, decode_matrix,
						  invert_matrix, decode_index, src_err_list,
						  src_in_err, nerrs, nsrcerrs, k, m);
			if (re != 0) {
				printf("Fail to gf_gen_decode_matrix\n");
				return -1;
			}
			// Pack recovery array as list of valid sources
			// Its order must be the same as the order
			// to generate matrix b in gf_gen_decode_matrix
			for (i = 0; i < k; i++) {
				recov[i] = efence_buffs[decode_index[i]];
			}

			// Recover data
			ec_init_tables(k, nerrs, decode_matrix, g_tbls);
			ec_encode_data(size, k, nerrs, g_tbls, recov, &temp_buffs[k]);

			for (i = 0; i < nerrs; i++) {

				if (0 !=
				    memcmp(temp_buffs[k + i], efence_buffs[src_err_list[i]],
					   size)) {
					printf("Efence: Fail error recovery (%d, %d, %d)\n", m,
					       k, nerrs);

					printf("size = %d\n", size);

					printf("Test erase list = ");
					for (j = 0; j < nerrs; j++)
						printf(" %d", src_err_list[j]);
					printf(" - Index = ");
					for (p = 0; p < k; p++)
						printf(" %d", decode_index[p]);
					printf("\nencode_matrix:\n");
					dump_u8xu8((u8 *) encode_matrix, m, k);
					printf("inv b:\n");
					dump_u8xu8((u8 *) invert_matrix, k, k);
					printf("\ndecode_matrix:\n");
					dump_u8xu8((u8 *) decode_matrix, m, k);

					printf("recov %d:", src_err_list[i]);
					dump(temp_buffs[k + i], align);
					printf("orig   :");
					dump(efence_buffs[src_err_list[i]], align);
					return -1;
				}
			}
		}

	}

	// Test rand ptr alignment if available

	for (rtest = 0; rtest < RANDOMS; rtest++) {
		while ((m = (rand() % MMAX)) < 2) ;
		while ((k = (rand() % KMAX)) >= m || k < 1) ;

		if (m > MMAX || k > KMAX)
			continue;

		size = (TEST_LEN - PTR_ALIGN_CHK_B) & ~15;

		offset = (PTR_ALIGN_CHK_B != 0) ? 1 : PTR_ALIGN_CHK_B;
		// Add random offsets
		for (i = 0; i < m; i++) {
			memset(buffs[i], 0, TEST_LEN);	// zero pad to check write-over
			memset(temp_buffs[i], 0, TEST_LEN);	// zero pad to check write-over
			ubuffs[i] = buffs[i] + (rand() & (PTR_ALIGN_CHK_B - offset));
			temp_ubuffs[i] = temp_buffs[i] + (rand() & (PTR_ALIGN_CHK_B - offset));
		}

		for (i = 0; i < k; i++)
			for (j = 0; j < size; j++)
				ubuffs[i][j] = rand();

		// The matrix generated by gf_gen_cauchy1_matrix
		// is always invertable.
		gf_gen_cauchy1_matrix(encode_matrix, m, k);

		// Make parity vects
		// Generate g_tbls from encode matrix a
		ec_init_tables(k, m - k, &encode_matrix[k * k], g_tbls);
		// Perform matrix dot_prod for EC encoding
		// using g_tbls from encode matrix a
		ec_encode_data(size, k, m - k, g_tbls, ubuffs, &ubuffs[k]);

		// Random errors
		memset(src_in_err, 0, TEST_SOURCES);
		gen_err_list(src_err_list, src_in_err, &nerrs, &nsrcerrs, k, m);

		// Generate decode matrix
		re = gf_gen_decode_matrix(encode_matrix, decode_matrix,
					  invert_matrix, decode_index, src_err_list,
					  src_in_err, nerrs, nsrcerrs, k, m);
		if (re != 0) {
			printf("Fail to gf_gen_decode_matrix\n");
			return -1;
		}
		// Pack recovery array as list of valid sources
		// Its order must be the same as the order
		// to generate matrix b in gf_gen_decode_matrix
		for (i = 0; i < k; i++) {
			recov[i] = ubuffs[decode_index[i]];
		}

		// Recover data
		ec_init_tables(k, nerrs, decode_matrix, g_tbls);
		ec_encode_data(size, k, nerrs, g_tbls, recov, &temp_ubuffs[k]);

		for (i = 0; i < nerrs; i++) {

			if (0 != memcmp(temp_ubuffs[k + i], ubuffs[src_err_list[i]], size)) {
				printf("Fail error recovery (%d, %d, %d) - ", m, k, nerrs);
				printf(" - erase list = ");
				for (j = 0; j < nerrs; j++)
					printf(" %d", src_err_list[j]);
				printf(" - Index = ");
				for (p = 0; p < k; p++)
					printf(" %d", decode_index[p]);
				printf("\nencode_matrix:\n");
				dump_u8xu8((unsigned char *)encode_matrix, m, k);
				printf("inv b:\n");
				dump_u8xu8((unsigned char *)invert_matrix, k, k);
				printf("\ndecode_matrix:\n");
				dump_u8xu8((unsigned char *)decode_matrix, m, k);
				printf("orig data:\n");
				dump_matrix(ubuffs, m, 25);
				printf("orig   :");
				dump(ubuffs[src_err_list[i]], 25);
				printf("recov %d:", src_err_list[i]);
				dump(temp_ubuffs[k + i], 25);
				return -1;
			}
		}

		// Confirm that padding around dests is unchanged
		memset(temp_buffs[0], 0, PTR_ALIGN_CHK_B);	// Make reference zero buff

		for (i = 0; i < m; i++) {

			offset = ubuffs[i] - buffs[i];

			if (memcmp(buffs[i], temp_buffs[0], offset)) {
				printf("Fail rand ualign encode pad start\n");
				return -1;
			}
			if (memcmp
			    (buffs[i] + offset + size, temp_buffs[0],
			     PTR_ALIGN_CHK_B - offset)) {
				printf("Fail rand ualign encode pad end\n");
				return -1;
			}
		}

		for (i = 0; i < nerrs; i++) {

			offset = temp_ubuffs[k + i] - temp_buffs[k + i];
			if (memcmp(temp_buffs[k + i], temp_buffs[0], offset)) {
				printf("Fail rand ualign decode pad start\n");
				return -1;
			}
			if (memcmp
			    (temp_buffs[k + i] + offset + size, temp_buffs[0],
			     PTR_ALIGN_CHK_B - offset)) {
				printf("Fail rand ualign decode pad end\n");
				return -1;
			}
		}

		putchar('.');
	}

	// Test size alignment

	align = (LEN_ALIGN_CHK_B != 0) ? 13 : 16;

	for (size = TEST_LEN; size > 0; size -= align) {
		while ((m = (rand() % MMAX)) < 2) ;
		while ((k = (rand() % KMAX)) >= m || k < 1) ;

		if (m > MMAX || k > KMAX)
			continue;

		for (i = 0; i < k; i++)
			for (j = 0; j < size; j++)
				buffs[i][j] = rand();

		// The matrix generated by gf_gen_cauchy1_matrix
		// is always invertable.
		gf_gen_cauchy1_matrix(encode_matrix, m, k);

		// Make parity vects
		// Generate g_tbls from encode matrix a
		ec_init_tables(k, m - k, &encode_matrix[k * k], g_tbls);
		// Perform matrix dot_prod for EC encoding
		// using g_tbls from encode matrix a
		ec_encode_data(size, k, m - k, g_tbls, buffs, &buffs[k]);

		// Random errors
		memset(src_in_err, 0, TEST_SOURCES);
		gen_err_list(src_err_list, src_in_err, &nerrs, &nsrcerrs, k, m);
		// Generate decode matrix
		re = gf_gen_decode_matrix(encode_matrix, decode_matrix,
					  invert_matrix, decode_index, src_err_list,
					  src_in_err, nerrs, nsrcerrs, k, m);
		if (re != 0) {
			printf("Fail to gf_gen_decode_matrix\n");
			return -1;
		}
		// Pack recovery array as list of valid sources
		// Its order must be the same as the order
		// to generate matrix b in gf_gen_decode_matrix
		for (i = 0; i < k; i++) {
			recov[i] = buffs[decode_index[i]];
		}

		// Recover data
		ec_init_tables(k, nerrs, decode_matrix, g_tbls);
		ec_encode_data(size, k, nerrs, g_tbls, recov, &temp_buffs[k]);

		for (i = 0; i < nerrs; i++) {

			if (0 != memcmp(temp_buffs[k + i], buffs[src_err_list[i]], size)) {
				printf("Fail error recovery (%d, %d, %d) - ", m, k, nerrs);
				printf(" - erase list = ");
				for (j = 0; j < nerrs; j++)
					printf(" %d", src_err_list[j]);
				printf(" - Index = ");
				for (p = 0; p < k; p++)
					printf(" %d", decode_index[p]);
				printf("\nencode_matrix:\n");
				dump_u8xu8((unsigned char *)encode_matrix, m, k);
				printf("inv b:\n");
				dump_u8xu8((unsigned char *)invert_matrix, k, k);
				printf("\ndecode_matrix:\n");
				dump_u8xu8((unsigned char *)decode_matrix, m, k);
				printf("orig data:\n");
				dump_matrix(buffs, m, 25);
				printf("orig   :");
				dump(buffs[src_err_list[i]], 25);
				printf("recov %d:", src_err_list[i]);
				dump(temp_buffs[k + i], 25);
				return -1;
			}
		}
	}

	printf("done EC tests: Pass\n");
	return 0;
}