+void printBitStream2(uint8_t BitStream[], uint32_t bitLen){
+ uint32_t i = 0;
+ if (bitLen<16) {
+ PrintAndLog("Too few bits found: %d",bitLen);
+ return;
+ }
+ if (bitLen>512) bitLen=512;
+ for (i = 0; i < (bitLen-16); i+=16) {
+ PrintAndLog("%i%i%i%i%i%i%i%i%i%i%i%i%i%i%i%i",
+ BitStream[i],
+ BitStream[i+1],
+ BitStream[i+2],
+ BitStream[i+3],
+ BitStream[i+4],
+ BitStream[i+5],
+ BitStream[i+6],
+ BitStream[i+7],
+ BitStream[i+8],
+ BitStream[i+9],
+ BitStream[i+10],
+ BitStream[i+11],
+ BitStream[i+12],
+ BitStream[i+13],
+ BitStream[i+14],
+ BitStream[i+15]);
+ }
+ return;
+}
+
+//by marshmellow
+//takes 1s and 0s and searches for EM410x format - output EM ID
+int Em410xDecode(const char *Cmd)
+{
+ //no arguments needed - built this way in case we want this to be a direct call from "data " cmds in the future
+ // otherwise could be a void with no arguments
+ //set defaults
+ int high=0, low=0;
+ uint32_t hi=0, lo=0;
+
+ uint32_t i = 0;
+ uint32_t initLoopMax = 1000;
+ if (initLoopMax>GraphTraceLen) initLoopMax=GraphTraceLen;
+
+ for (;i < initLoopMax; ++i) //1000 samples should be plenty to find high and low values
+ {
+ if (GraphBuffer[i] > high)
+ high = GraphBuffer[i];
+ else if (GraphBuffer[i] < low)
+ low = GraphBuffer[i];
+ }
+ if (((high !=1)||(low !=0))){ //allow only 1s and 0s
+ PrintAndLog("no data found");
+ return 0;
+ }
+ uint8_t parityTest=0;
+ // 111111111 bit pattern represent start of frame
+ int frame_marker_mask[] = {1,1,1,1,1,1,1,1,1};
+ uint32_t idx = 0;
+ uint32_t ii=0;
+ uint8_t resetCnt = 0;
+ while( (idx + 64) < GraphTraceLen) {
+restart:
+ // search for a start of frame marker
+ if ( memcmp(GraphBuffer+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0)
+ { // frame marker found
+ idx+=9;//sizeof(frame_marker_mask);
+ for (i=0; i<10;i++){
+ for(ii=0; ii<5; ++ii){
+ parityTest += GraphBuffer[(i*5)+ii+idx];
+ }
+ if (parityTest== ((parityTest>>1)<<1)){
+ parityTest=0;
+ for (ii=0; ii<4;++ii){
+ hi = (hi<<1)|(lo>>31);
+ lo=(lo<<1)|(GraphBuffer[(i*5)+ii+idx]);
+ }
+ //PrintAndLog("DEBUG: EM parity passed parity val: %d, i:%d, ii:%d,idx:%d, Buffer: %d%d%d%d%d,lo: %d",parityTest,i,ii,idx,GraphBuffer[idx+ii+(i*5)-5],GraphBuffer[idx+ii+(i*5)-4],GraphBuffer[idx+ii+(i*5)-3],GraphBuffer[idx+ii+(i*5)-2],GraphBuffer[idx+ii+(i*5)-1],lo);
+ }else {//parity failed
+ //PrintAndLog("DEBUG: EM parity failed parity val: %d, i:%d, ii:%d,idx:%d, Buffer: %d%d%d%d%d",parityTest,i,ii,idx,GraphBuffer[idx+ii+(i*5)-5],GraphBuffer[idx+ii+(i*5)-4],GraphBuffer[idx+ii+(i*5)-3],GraphBuffer[idx+ii+(i*5)-2],GraphBuffer[idx+ii+(i*5)-1]);
+ parityTest=0;
+ idx-=8;
+ if (resetCnt>5)return 0;
+ resetCnt++;
+ goto restart;//continue;
+ }
+ }
+ //skip last 5 bit parity test for simplicity.
+
+ //output em id
+ PrintAndLog("EM TAG ID : %02x%08x", hi, lo);
+ //get Unique ID
+ uint32_t iii=1;
+ uint32_t id2hi=0,id2lo=0;
+ for (i=0;i<8;i++){
+ id2hi=(id2hi<<1)|((hi & (iii<<(i)))>>i);
+ }
+ for (ii=4; ii>0;ii--){
+ for (i=0;i<8;i++){
+ id2lo=(id2lo<<1)|((lo & (iii<<(i+((ii-1)*8))))>>(i+((ii-1)*8)));
+ }
+ }
+ PrintAndLog("Unique TAG ID: %02x%08x", id2hi, id2lo);
+ PrintAndLog("DEZ 8 : %08d",lo & 0xFFFFFF);
+ PrintAndLog("DEZ 10 : %010d",lo & 0xFFFFFF);
+ PrintAndLog("DEZ 5.5 : %05d.%05d",(lo>>16) & 0xFFFF,lo & 0xFFFF);
+ PrintAndLog("DEZ 3.5A : %03d.%05d",hi,lo &0xFFFF);
+ return 0;
+ }else{
+ idx++;
+ }
+ }
+ return 0;
+}
+