CHG: minor correction to the em410xsim help text.

[proxmark3-svn] / common / lfdemod.c

diff --git a/common/lfdemod.c b/common/lfdemod.c
index c7acb404bac93319c4176eafb494654200a96cf6..3305c8b0c53e84adb4cdd992c28c3a51fac531b2 100644 (file)
--- a/common/lfdemod.c
+++ b/common/lfdemod.c
@@ -97,6 +97,7 @@ uint8_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_
   for (uint8_t extraBitChk=0; extraBitChk<5; extraBitChk++){
     errChk = preambleSearch(BitStream+extraBitChk+*startIdx, preamble, sizeof(preamble), size, startIdx);
     if (errChk == 0) return 0;
+       if (*size<64) return 0;
     if (*size>64) FmtLen = 22;
     if (*size<64) return 0;
     idx = *startIdx + 9;
@@ -1751,22 +1752,22 @@ int pskRawDemod(uint8_t dest[], size_t *size, int *clock, int *invert)
   //find first phase shift
   for (i=0; i<loopCnt; i++){
     if (dest[i]+fc < dest[i+1] && dest[i+1] >= dest[i+2]){
-      waveEnd = i+1;
-      //PrintAndLog("DEBUG: waveEnd: %d",waveEnd);
-      waveLenCnt = waveEnd-waveStart;
+        waveEnd = i+1;
+        //PrintAndLog("DEBUG: waveEnd: %d",waveEnd);
+        waveLenCnt = waveEnd-waveStart;
       if (waveLenCnt > fc && waveStart > fc){ //not first peak and is a large wave 
         lastAvgWaveVal = avgWaveVal/(waveLenCnt);
-        firstFullWave = waveStart;
-        fullWaveLen=waveLenCnt;
-        //if average wave value is > graph 0 then it is an up wave or a 1
+          firstFullWave = waveStart;
+          fullWaveLen=waveLenCnt;
+          //if average wave value is > graph 0 then it is an up wave or a 1
         if (lastAvgWaveVal > 123) curPhase^=1;  //fudge graph 0 a little 123 vs 128
-        break;
-      } 
+          break;
+        } 
       waveStart = i+1;
       avgWaveVal = 0;
-    }
+      }
     avgWaveVal+=dest[i+2];
-  }
+    }
   //PrintAndLog("DEBUG: firstFullWave: %d, waveLen: %d",firstFullWave,fullWaveLen);  
   lastClkBit = firstFullWave; //set start of wave as clock align
   //PrintAndLog("DEBUG: clk: %d, lastClkBit: %d", *clock, lastClkBit);
@@ -1788,7 +1789,7 @@ int pskRawDemod(uint8_t dest[], size_t *size, int *clock, int *invert)
         waveEnd = i+1;
         waveLenCnt = waveEnd-waveStart;
         lastAvgWaveVal = avgWaveVal/waveLenCnt;
-        if (waveLenCnt > fc){  
+        if (waveLenCnt > fc){ 
           //PrintAndLog("DEBUG: avgWaveVal: %d, waveSum: %d",lastAvgWaveVal,avgWaveVal);
           //if this wave is a phase shift
           //PrintAndLog("DEBUG: phase shift at: %d, len: %d, nextClk: %d, i: %d, fc: %d",waveStart,waveLenCnt,lastClkBit+*clock-tol,i+1,fc);