//by marshmellow
//takes 1s and 0s and searches for EM410x format - output EM ID
// actually, no arguments needed - built this way in case we want this to be a direct call from "data " cmds in the future
-uint8_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_t *hi, uint64_t *lo)
+int Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_t *hi, uint64_t *lo)
{
// sanity check
- if (BitStream[1] > 1) return 0;
+ if (BitStream[1] > 1) return -1;
uint8_t fmtlen;
*startIdx = 0;
// include 0 in front to help get start pos
uint8_t preamble[] = {0,1,1,1,1,1,1,1,1,1};
if (!preambleSearch(BitStream, preamble, sizeof(preamble), size, startIdx))
- return 0;
- if (*size < 64) return 0;
+ return -2;
+ if (*size < 64) return -3;
fmtlen = (*size == 110) ? 22 : 10;
*lo = ((uint64_t)(bytebits_to_byte(BitStream + 24, 32)) << 32) | (bytebits_to_byte(BitStream + 24 + 32, 32));
break;
}
- default: return 0;
-
+ default: return -4;
}
return 1;
}