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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2025 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include "crc_verify.h"
#include "crc_internal.h"
#include "log.h"
const uint8_t crcCheckData[] = {
0X31, 0X32, 0X33, 0X34, 0X35, 0X36, 0X37, 0X38, 0X39
};
const uint8_t crcCheckSize = sizeof(crcCheckData);
static void
crcLogMismatch (const CRCGenerator *crc,const char *what, crc_t actual, crc_t expected) {
logMessage(LOG_WARNING,
"CRC %s mismatch: %s: Actual:%"PRIcrc " Expected:%"PRIcrc,
what, crc->algorithmName, actual, expected
);
}
int
crcVerifyChecksum (const CRCGenerator *crc, crc_t expected) {
crc_t actual = crcGetChecksum(crc);
int ok = actual == expected;
if (!ok) crcLogMismatch(crc, "checksum", actual, expected);
return ok;
}
int
crcVerifyResidue (CRCGenerator *crc) {
crc_t actual = crcGetResidue(crc);
crc_t expected = crc->algorithm.residue;
int ok = actual == expected;
if (!ok) crcLogMismatch(crc, "residue", actual, expected);
return ok;
}
int
crcVerifyAlgorithmWithData (
const CRCAlgorithm *algorithm,
const void *data, size_t size, crc_t expected
) {
CRCGenerator *crc = crcNewGenerator(algorithm);
crcAddData(crc, data, size);
int ok = crcVerifyChecksum(crc, expected);
if (ok) ok = crcVerifyResidue(crc);
crcDestroyGenerator(crc);
return ok;
}
int
crcVerifyAlgorithmWithString (
const CRCAlgorithm *algorithm,
const char *string, crc_t expected
) {
return crcVerifyAlgorithmWithData(algorithm, string, strlen(string), expected);
}
int
crcVerifyAlgorithm (const CRCAlgorithm *algorithm) {
return crcVerifyAlgorithmWithData(
algorithm, crcCheckData, crcCheckSize, algorithm->checkValue
);
}
int
crcVerifyProvidedAlgorithms (void) {
int ok = 1;
const CRCAlgorithm **algorithm = crcProvidedAlgorithms;
while (*algorithm) {
if (!crcVerifyAlgorithm(*algorithm)) ok = 0;
algorithm += 1;
}
return ok;
}
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