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iceman1001 2019-03-25 14:59:01 +01:00
commit 962e58b475
1 changed files with 5 additions and 5 deletions
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common/wiegand.c
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@ -36,22 +36,22 @@ uint8_t checkParity(uint32_t bits, uint8_t len, uint8_t type);
// by marshmellow // by marshmellow
// takes a array of binary values, start position, length of bits per parity (includes parity bit), // takes a array of binary values, start position, length of bits per parity (includes parity bit),
// Parity Type (1 for odd; 0 for even; 2 for Always 1's; 3 for Always 0's), and binary Length (length to run) // Parity Type (1 for odd; 0 for even; 2 for Always 1's; 3 for Always 0's), and binary Length (length to run)
size_t removeParity(uint8_t *bitstream, size_t startIdx, uint8_t pLen, uint8_t pType, size_t bLen) { size_t removeParity(uint8_t *bits, size_t startIdx, uint8_t pLen, uint8_t pType, size_t bLen) {
uint32_t parityWd = 0; uint32_t parityWd = 0;
size_t j = 0, bitcount = 0; size_t j = 0, bitcount = 0;
for (int word = 0; word < (bLen); word += pLen) { for (int word = 0; word < (bLen); word += pLen) {
for (int bit = 0; bit < pLen; ++bit) { for (int bit = 0; bit < pLen; ++bit) {
parityWd = (parityWd << 1) | bitstream[startIdx + word + bit]; parityWd = (parityWd << 1) | bits[startIdx + word + bit];
bitstream[j++] = (bitstream[startIdx + word + bit]); bits[j++] = (bits[startIdx + word + bit]);
} }
j--; // overwrite parity with next data j--; // overwrite parity with next data
// if parity fails then return 0 // if parity fails then return 0
switch (pType) { switch (pType) {
case 3: case 3:
if (bitstream[j] == 1) return 0; if (bits[j] == 1) return 0;
break; //should be 0 spacer bit break; //should be 0 spacer bit
case 2: case 2:
if (bitstream[j] == 0) return 0; if (bits[j] == 0) return 0;
break; //should be 1 spacer bit break; //should be 1 spacer bit
default: //test parity default: //test parity
if (parityTest(parityWd, pLen, pType) == 0) return 0; if (parityTest(parityWd, pLen, pType) == 0) return 0;