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crc.c
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crc.c
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/* test_libFLAC - Unit tester for libFLAC
* Copyright (C) 2014-2018 Xiph.Org Foundation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include "FLAC/assert.h"
#include "share/compat.h"
#include "private/crc.h"
#include "crc.h"
static FLAC__uint8 crc8_update_ref(FLAC__byte byte, FLAC__uint8 crc);
static FLAC__uint16 crc16_update_ref(FLAC__byte byte, FLAC__uint16 crc);
static FLAC__bool test_crc8(const FLAC__byte *data, size_t size);
static FLAC__bool test_crc16(const FLAC__byte *data, size_t size);
static FLAC__bool test_crc16_update(const FLAC__byte *data, size_t size);
static FLAC__bool test_crc16_32bit_words(const FLAC__uint32 *words, size_t size);
static FLAC__bool test_crc16_64bit_words(const FLAC__uint64 *words, size_t size);
#define DATA_SIZE 32768
FLAC__bool test_crc(void)
{
uint32_t i;
FLAC__byte data[DATA_SIZE] = { 0 };
/* Initialize data reproducibly with pseudo-random values. */
for (i = 1; i < DATA_SIZE; i++)
data[i] = crc8_update_ref(i % 256, data[i - 1]);
printf("\n+++ libFLAC unit test: crc\n\n");
if (! test_crc8(data, DATA_SIZE))
return false;
if (! test_crc16(data, DATA_SIZE))
return false;
if (! test_crc16_update(data, DATA_SIZE))
return false;
if (! test_crc16_32bit_words((FLAC__uint32 *)data, DATA_SIZE / 4))
return false;
if (! test_crc16_64bit_words((FLAC__uint64 *)data, DATA_SIZE / 8))
return false;
printf("\nPASSED!\n");
return true;
}
/*----------------------------------------------------------------------------*/
/* Reference implementations of CRC-8 and CRC-16 to check against. */
#define CRC8_POLYNOMIAL 0x07
static FLAC__uint8 crc8_update_ref(FLAC__byte byte, FLAC__uint8 crc)
{
uint32_t i;
crc ^= byte;
for (i = 0; i < 8; i++) {
crc = (crc << 1) ^ ((crc >> 7) ? CRC8_POLYNOMIAL : 0);
}
return crc;
}
#define CRC16_POLYNOMIAL 0x8005
static FLAC__uint16 crc16_update_ref(FLAC__byte byte, FLAC__uint16 crc)
{
uint32_t i;
crc ^= byte << 8;
for (i = 0; i < 8; i++) {
crc = (crc << 1) ^ ((crc >> 15) ? CRC16_POLYNOMIAL : 0);
}
return crc;
}
/*----------------------------------------------------------------------------*/
static FLAC__bool test_crc8(const FLAC__byte *data, size_t size)
{
uint32_t i;
FLAC__uint8 crc0,crc1;
printf("testing FLAC__crc8 ... ");
crc0 = 0;
crc1 = FLAC__crc8(data, 0);
if (crc1 != crc0) {
printf("FAILED, FLAC__crc8 returned non-zero CRC for zero bytes of data\n");
return false;
}
for (i = 0; i < size; i++) {
crc0 = crc8_update_ref(data[i], crc0);
crc1 = FLAC__crc8(data, i + 1);
if (crc1 != crc0) {
printf("FAILED, FLAC__crc8 result did not match reference CRC for %i bytes of test data\n", i + 1);
return false;
}
}
printf("OK\n");
return true;
}
static FLAC__bool test_crc16(const FLAC__byte *data, size_t size)
{
uint32_t i;
FLAC__uint16 crc0,crc1;
printf("testing FLAC__crc16 ... ");
crc0 = 0;
crc1 = FLAC__crc16(data, 0);
if (crc1 != crc0) {
printf("FAILED, FLAC__crc16 returned non-zero CRC for zero bytes of data\n");
return false;
}
for (i = 0; i < size; i++) {
crc0 = crc16_update_ref(data[i], crc0);
crc1 = FLAC__crc16(data, i + 1);
if (crc1 != crc0) {
printf("FAILED, FLAC__crc16 result did not match reference CRC for %i bytes of test data\n", i + 1);
return false;
}
}
printf("OK\n");
return true;
}
static FLAC__bool test_crc16_update(const FLAC__byte *data, size_t size)
{
uint32_t i;
FLAC__uint16 crc0,crc1;
printf("testing FLAC__CRC16_UPDATE macro ... ");
crc0 = 0;
crc1 = 0;
for (i = 0; i < size; i++) {
crc0 = crc16_update_ref(data[i], crc0);
crc1 = FLAC__CRC16_UPDATE(data[i], crc1);
if (crc1 != crc0) {
printf("FAILED, FLAC__CRC16_UPDATE result did not match reference CRC after %i bytes of test data\n", i + 1);
return false;
}
}
printf("OK\n");
return true;
}
static FLAC__bool test_crc16_32bit_words(const FLAC__uint32 *words, size_t size)
{
uint32_t n,i,k;
FLAC__uint16 crc0,crc1;
for (n = 1; n <= 16; n++) {
printf("testing FLAC__crc16_update_words32 (length=%i) ... ", n);
crc0 = 0;
crc1 = 0;
for (i = 0; i <= size - n; i += n) {
for (k = 0; k < n; k++) {
crc0 = crc16_update_ref( words[i + k] >> 24, crc0);
crc0 = crc16_update_ref((words[i + k] >> 16) & 0xFF, crc0);
crc0 = crc16_update_ref((words[i + k] >> 8) & 0xFF, crc0);
crc0 = crc16_update_ref( words[i + k] & 0xFF, crc0);
}
crc1 = FLAC__crc16_update_words32(words + i, n, crc1);
if (crc1 != crc0) {
printf("FAILED, FLAC__crc16_update_words32 result did not match reference CRC after %i words of test data\n", i + n);
return false;
}
}
crc1 = FLAC__crc16_update_words32(words, 0, crc1);
if (crc1 != crc0) {
printf("FAILED, FLAC__crc16_update_words32 called with zero bytes changed CRC value\n");
return false;
}
printf("OK\n");
}
return true;
}
static FLAC__bool test_crc16_64bit_words(const FLAC__uint64 *words, size_t size)
{
uint32_t n,i,k;
FLAC__uint16 crc0,crc1;
for (n = 1; n <= 16; n++) {
printf("testing FLAC__crc16_update_words64 (length=%i) ... ", n);
crc0 = 0;
crc1 = 0;
for (i = 0; i <= size - n; i += n) {
for (k = 0; k < n; k++) {
crc0 = crc16_update_ref( words[i + k] >> 56, crc0);
crc0 = crc16_update_ref((words[i + k] >> 48) & 0xFF, crc0);
crc0 = crc16_update_ref((words[i + k] >> 40) & 0xFF, crc0);
crc0 = crc16_update_ref((words[i + k] >> 32) & 0xFF, crc0);
crc0 = crc16_update_ref((words[i + k] >> 24) & 0xFF, crc0);
crc0 = crc16_update_ref((words[i + k] >> 16) & 0xFF, crc0);
crc0 = crc16_update_ref((words[i + k] >> 8) & 0xFF, crc0);
crc0 = crc16_update_ref( words[i + k] & 0xFF, crc0);
}
crc1 = FLAC__crc16_update_words64(words + i, n, crc1);
if (crc1 != crc0) {
printf("FAILED, FLAC__crc16_update_words64 result did not match reference CRC after %i words of test data\n", i + n);
return false;
}
}
crc1 = FLAC__crc16_update_words64(words, 0, crc1);
if (crc1 != crc0) {
printf("FAILED, FLAC__crc16_update_words64 called with zero bytes changed CRC value\n");
return false;
}
printf("OK\n");
}
return true;
}