X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/78f59945a725db88acacc772a37f32ff6debea56..ceb34a3c1be2ebebfc5e062e39fd83ed0624fb4f:/common/lfdemod.c?ds=sidebyside
diff --git a/common/lfdemod.c b/common/lfdemod.c
index 56947a1a..c35ce561 100644
--- 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
@@ -73,7 +71,7 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p
{
uint32_t parityWd = 0;
size_t j = 0, bitCnt = 0;
- for (int word = 0; word < (bLen); word+=pLen){
+ for (int word = 0; word < (bLen); word += pLen){
for (int bit=0; bit < pLen; bit++){
parityWd = (parityWd << 1) | BitStream[startIdx+word+bit];
BitStream[j++] = (BitStream[startIdx+word+bit]);
@@ -81,14 +79,11 @@ 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) {
- 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);
+ bitCnt += (pLen-1);
parityWd = 0;
}
// if we got here then all the parities passed
@@ -172,13 +167,13 @@ 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
-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;
- 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
@@ -189,14 +184,15 @@ 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);
- 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 (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);
@@ -587,7 +583,7 @@ int HIDdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32
{
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;
@@ -619,7 +615,7 @@ int ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, ui
{
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;
@@ -681,7 +677,6 @@ int IOdemodFSK(uint8_t *dest, size_t size)
int VikingDemod_AM(uint8_t *dest, size_t *size) {
//make sure buffer has data
if (*size < 64*2) return -2;
-
size_t startIdx = 0;
uint8_t preamble[] = {1,1,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx);
@@ -697,67 +692,77 @@ int VikingDemod_AM(uint8_t *dest, size_t *size) {
if ( checkCalc != 0xA8 ) return -5;
if (*size != 64) return -6;
//return start position
- return (int) startIdx;
+ 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;
+}
+// by iceman
+// find Noralsy preamble in already demoded data
+int NoralsyDemod_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[] = {1,0,1,1,1,0,1,1,0,0,0,0};
+ 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
- if (*size < 64*2) return -2;
-
+ if (*size < 128*2) return -1; //make sure buffer has data
size_t startIdx = 0;
- uint8_t preamble[] = {1,0,0,0,0,1,1,0,1,0,0,0,0,0,0,0,0,0,0,0};
+ uint8_t preamble[] = {0,0,0,1,0,0,0,0,1,1,0,1,0,0,0,0,0,0,0,0,0,0,0};
uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx);
- if (errChk == 0) return -4; //preamble not found
+ if (errChk == 0) return -2; //preamble not found
+ if (*size != 128) return -3; //wrong demoded size
//return start position
- return (int) startIdx;
+ return (int)startIdx;
}
// Ask/Biphase Demod then try to locate an ISO 11784/85 ID
// BitStream must contain previously askrawdemod and biphasedemoded data
-int FDXBdemodBI(uint8_t *dest, size_t *size)
-{
- //make sure buffer has enough data
- if (*size < 128) return -1;
-
+int FDXBdemodBI(uint8_t *dest, size_t *size) {
+ if (*size < 128*2) return -1; //make sure buffer has enough data
size_t startIdx = 0;
uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,0,1};
-
uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx);
if (errChk == 0) return -2; //preamble not found
+ if (*size != 128) return -3; //wrong demoded size
+ //return start position
return (int)startIdx;
}
// ASK/Diphase fc/64 (inverted Biphase)
// Note: this i s not a demod, this is only a detection
// the parameter *dest needs to be demoded before call
+// 0xFFFF preamble, 64bits
int JablotronDemod(uint8_t *dest, size_t *size){
- //make sure buffer has enough data
- if (*size < 64) return -1;
-
+ if (*size < 64*2) return -1; //make sure buffer has enough data
size_t startIdx = 0;
- // 0xFFFF preamble, 64bits
- uint8_t preamble[] = {
- 1,1,1,1,
- 1,1,1,1,
- 1,1,1,1,
- 1,1,1,1,
- 0
- };
-
+ uint8_t preamble[] = {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0};
uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx);
- if (errChk == 0) return -4; //preamble not found
- if (*size != 64) return -3;
+ if (errChk == 0) return -2; //preamble not found
+ if (*size != 64) return -3; // wrong demoded size
uint8_t checkchksum = 0;
for (int i=16; i < 56; i += 8) {
checkchksum += bytebits_to_byte(dest+startIdx+i,8);
}
checkchksum ^= 0x3A;
-
uint8_t crc = bytebits_to_byte(dest+startIdx+56, 8);
-
- if ( checkchksum != crc ) return -5;
+ if ( checkchksum != crc ) return -5;
return (int)startIdx;
}
@@ -796,7 +801,7 @@ int PyramiddemodFSK(uint8_t *dest, size_t *size)
*size = fskdemod(dest, *size, 50, 1, 10, 8); // fsk2a RF/50
if (*size < 128) return -2; //did we get a good demod?
- uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
+ uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1};
size_t startIdx = 0;
uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx);
if (errChk == 0) return -4; //preamble not found