ADD: forgot to add the files

[proxmark3-svn] / common / lfdemod.c

diff --git a/common/lfdemod.c b/common/lfdemod.c
index 8bbe5bebf884a594a18c1c163eae165ba61b7f3e..11340ef003d0b1255e844b3a45cb9d6e6138337d 100644 (file)
--- a/common/lfdemod.c
+++ b/common/lfdemod.c
@@ -25,15 +25,13 @@ void dummy(char *fmt, ...){}
 #define prnt dummy
 #endif
 
-uint8_t justNoise(uint8_t *BitStream, size_t size)
-{
-       static const uint8_t THRESHOLD = 123;
-       //test samples are not just noise
-       uint8_t justNoise1 = 1;
-       for(size_t idx=0; idx < size && justNoise1 ;idx++){
-               justNoise1 = BitStream[idx] < THRESHOLD;
-       }
-       return justNoise1;
+//test samples are not just noise
+uint8_t justNoise(uint8_t *bits, size_t size) {
+       #define THRESHOLD 123
+       uint8_t val = 1;
+       for(size_t idx=0; idx < size && val ;idx++)
+               val = bits[idx] < THRESHOLD;
+       return val;
 }
 
 //by marshmellow
@@ -698,6 +696,19 @@ int VikingDemod_AM(uint8_t *dest, size_t *size) {
        return (int) startIdx;
 }
 
+// by iceman
+// find Visa2000 preamble in already demoded data
+int Visa2kDemod_AM(uint8_t *dest, size_t *size) {
+       if (*size < 96*2) return -1; //make sure buffer has data
+       size_t startIdx = 0;
+       uint8_t preamble[] = {0,1,0,1,0,1,1,0,0,1,0,0,1,0,0,1,0,1,0,1,0,0,1,1,0,0,1,1,0,0,1,0};
+       uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx);
+       if (errChk == 0) return -2; //preamble not found
+       if (*size != 96) return -3; //wrong demoded size
+       //return start position
+       return (int) startIdx;
+}
+
 // find presco preamble 0x10D in already demoded data
 int PrescoDemod(uint8_t *dest, size_t *size) {
        //make sure buffer has data