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Philippe Teuwen 2019-04-06 00:14:07 +02:00
parent 366c1ec901
commit 38f6fd037f
1 changed files with 4 additions and 4 deletions
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8
common/wiegand.c
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@ -72,20 +72,20 @@ size_t removeParity(uint8_t *bits, size_t startIdx, uint8_t pLen, uint8_t pType,
// Make sure *dest is long enough to store original sourceLen + #_of_parities_to_be_added
/*
* @brief addParity
* @param bits pointer to the source bitstream of binary values
* @param src pointer to the source bitstream of binary values
* @param dest pointer to the destination where parities together with bits are added.
* @param sourceLen number of
* @param pLen length bits to be checked
* @param pType EVEN|ODD|2 (always 1's)|3 (always 0's)
* @return
*/
size_t addParity(uint8_t *bits, uint8_t *dest, uint8_t sourceLen, uint8_t pLen, uint8_t pType) {
size_t addParity(uint8_t *src, uint8_t *dest, uint8_t sourceLen, uint8_t pLen, uint8_t pType) {
uint32_t parityWd = 0;
size_t j = 0, bitCnt = 0;
for (int word = 0; word < sourceLen; word += pLen - 1) {
for (int bit = 0; bit < pLen - 1; ++bit) {
parityWd = (parityWd << 1) | bits[word + bit];
dest[j++] = (bits[word + bit]);
parityWd = (parityWd << 1) | src[word + bit];
dest[j++] = (src[word + bit]);
}
// if parity fails then return 0