TEST: see if the readerfield is needed.

[proxmark3-svn] / common / lfdemod.c

diff --git a/common/lfdemod.c b/common/lfdemod.c
index ff80b8b341e538a17780756541268f497dce106e..8bbe5bebf884a594a18c1c163eae165ba61b7f3e 100644 (file)
--- a/common/lfdemod.c
+++ b/common/lfdemod.c
@@ -81,12 +81,9 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p
                j--; // overwrite parity with next data
                // if parity fails then return 0
                switch (pType) {
                j--; // overwrite parity with next data
                // if parity fails then return 0
                switch (pType) {

-                       case 3: if (BitStream[j]==1) return 0; break; //should be 0 spacer bit
-                       case 2: if (BitStream[j]==0) return 0; break; //should be 1 spacer bit
-                       default: //test parity
-                               if (parityTest(parityWd, pLen, pType) == 0) 
-                                       return 0; 
-                               break;
+                       case 3:  if (BitStream[j]==1) { return 0; } break; //should be 0 spacer bit
+                       case 2:  if (BitStream[j]==0) { return 0; } break; //should be 1 spacer bit
+                       default: if (parityTest(parityWd, pLen, pType) == 0) { return 0; } break; //test parity

                }
                bitCnt+=(pLen-1);
                parityWd = 0;
                }
                bitCnt+=(pLen-1);
                parityWd = 0;


@@ -172,13 +169,13 @@ uint8_t preambleSearch(uint8_t *BitStream, uint8_t *preamble, size_t pLen, size_
 
 //by marshmellow
 //takes 1s and 0s and searches for EM410x format - output EM ID
 
 //by marshmellow
 //takes 1s and 0s and searches for EM410x format - output EM ID

-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)

 {
        //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
        uint32_t i = 0;
 {
        //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
        uint32_t i = 0;

-       if (BitStream[1]>1) return 0;  //allow only 1s and 0s
+       if (BitStream[1]>1) return -1;  //allow only 1s and 0s

 
        // 111111111 bit pattern represent start of frame
        //  include 0 in front to help get start pos
 
        // 111111111 bit pattern represent start of frame
        //  include 0 in front to help get start pos


@@ -189,14 +186,15 @@ uint8_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_
        uint8_t FmtLen = 10;
        *startIdx = 0;
        errChk = preambleSearch(BitStream, preamble, sizeof(preamble), size, startIdx);
        uint8_t FmtLen = 10;
        *startIdx = 0;
        errChk = preambleSearch(BitStream, preamble, sizeof(preamble), size, startIdx);

-       if (errChk == 0 || *size < 64) return 0;
+       if (errChk == 0 ) return -4;
+       if (*size < 64) return -3;

        if (*size > 64) FmtLen = 22;
        *startIdx += 1; //get rid of 0 from preamble
        idx = *startIdx + 9;
        for (i=0; i<FmtLen; i++){ //loop through 10 or 22 sets of 5 bits (50-10p = 40 bits or 88 bits)
                parityBits = bytebits_to_byte(BitStream+(i*5)+idx,5);
                //check even parity - quit if failed
        if (*size > 64) FmtLen = 22;
        *startIdx += 1; //get rid of 0 from preamble
        idx = *startIdx + 9;
        for (i=0; i<FmtLen; i++){ //loop through 10 or 22 sets of 5 bits (50-10p = 40 bits or 88 bits)
                parityBits = bytebits_to_byte(BitStream+(i*5)+idx,5);
                //check even parity - quit if failed

-               if (parityTest(parityBits, 5, 0) == 0) return 0;
+               if (parityTest(parityBits, 5, 0) == 0) return -5;

                //set uint64 with ID from BitStream
                for (uint8_t ii=0; ii<4; ii++){
                        *hi = (*hi << 1) | (*lo >> 63);
                //set uint64 with ID from BitStream
                for (uint8_t ii=0; ii<4; ii++){
                        *hi = (*hi << 1) | (*lo >> 63);


@@ -587,7 +585,7 @@ int HIDdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32
 {
        if (justNoise(dest, *size)) return -1;
 
 {
        if (justNoise(dest, *size)) return -1;
 

-       size_t numStart=0, size2=*size, startIdx=0; 
+       size_t numStart=0, size2 = *size, startIdx=0; 

        // FSK demodulator
        *size = fskdemod(dest, size2,50,1,10,8); //fsk2a
        if (*size < 96*2) return -2;
        // FSK demodulator
        *size = fskdemod(dest, size2,50,1,10,8); //fsk2a
        if (*size < 96*2) return -2;


@@ -619,7 +617,7 @@ int ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, ui
 {
        if (justNoise(dest, *size)) return -1;
        
 {
        if (justNoise(dest, *size)) return -1;
        

-       size_t numStart=0, size2=*size, startIdx=0;
+       size_t numStart=0, size2 = *size, startIdx=0;

        // FSK demodulator
        *size = fskdemod(dest, size2,50,1,10,8); //fsk2a
        if (*size < 96) return -2;
        // FSK demodulator
        *size = fskdemod(dest, size2,50,1,10,8); //fsk2a
        if (*size < 96) return -2;