- int DetectFirstTransition(const int * data, const size_t len, int threshold){
-
- int i = 0;
- /* now look for the first threshold */
- for (; i < len; ++i) {
- if (data[i] == threshold) {
- break;
- }
- }
- return i;
- }
-
- int ManchesterConvertFrom255(const int * data, const size_t len, uint8_t * dataout, int dataoutlen, int high, int low, int clock, int startIndex){
-
- int i, j, z, hithigh, hitlow, bitIndex, startType;
- i = 0;
- bitIndex = 0;
-
- int isDamp = 0;
- int damplimit = (int)((high / 2) * 0.3);
- int dampHi = (high/2)+damplimit;
- int dampLow = (high/2)-damplimit;
- int firstST = 0;
-
- // i = clock frame of data
- for (; i < (int)(len/clock); i++)
- {
- hithigh = 0;
- hitlow = 0;
- startType = -1;
- z = startIndex + (i*clock);
- isDamp = 0;
-
- /* Find out if we hit both high and low peaks */
- for (j = 0; j < clock; j++)
- {
- if (data[z+j] == high){
- hithigh = 1;
- if ( startType == -1)
- startType = 1;
- }
-
- if (data[z+j] == low ){
- hitlow = 1;
- if ( startType == -1)
- startType = 0;
- }
-
- if (hithigh && hitlow)
- break;
- }
-
- // No high value found, are we in a dampening field?
- if ( !hithigh ) {
- //PrintAndLog(" # Entering damp test at index : %d (%d)", z+j, j);
- for (j = 0; j < clock; j++) {
- if (
- (data[z+j] <= dampHi && data[z+j] >= dampLow)
- ){
- isDamp++;
- }
- }
- }
-
- /* Manchester Switching..
- 0: High -> Low
- 1: Low -> High
- */
- if (startType == 0)
- dataout[bitIndex++] = 1;
- else if (startType == 1)
- dataout[bitIndex++] = 0;
- else
- dataout[bitIndex++] = 2;
-
- if ( isDamp > clock/2 ) {
- firstST++;
- }
-
- if ( firstST == 4)
- break;
- if ( bitIndex >= dataoutlen-1 )
- break;
- }
- return bitIndex;
- }
-
- int ManchesterConvertFrom1(const int * data, const size_t len, uint8_t * dataout,int dataoutlen, int clock, int startIndex){
-
- PrintAndLog(" Path B");
-
- int i,j, bitindex, lc, tolerance, warnings;
- warnings = 0;
- int upperlimit = len*2/clock+8;
- i = startIndex;
- j = 0;
- tolerance = clock/4;
- uint8_t decodedArr[len];
-
- /* Detect duration between 2 successive transitions */
- for (bitindex = 1; i < len; i++) {
-
- if (data[i-1] != data[i]) {
- lc = i - startIndex;
- startIndex = i;
-
- // Error check: if bitindex becomes too large, we do not
- // have a Manchester encoded bitstream or the clock is really wrong!
- if (bitindex > upperlimit ) {
- PrintAndLog("Error: the clock you gave is probably wrong, aborting.");
- return 0;
- }
- // Then switch depending on lc length:
- // Tolerance is 1/4 of clock rate (arbitrary)
- if (abs((lc-clock)/2) < tolerance) {
- // Short pulse : either "1" or "0"
- decodedArr[bitindex++] = data[i-1];
- } else if (abs(lc-clock) < tolerance) {
- // Long pulse: either "11" or "00"
- decodedArr[bitindex++] = data[i-1];
- decodedArr[bitindex++] = data[i-1];
- } else {
- ++warnings;
- PrintAndLog("Warning: Manchester decode error for pulse width detection.");
- if (warnings > 10) {
- PrintAndLog("Error: too many detection errors, aborting.");
- return 0;
- }
- }
- }
- }
-
- /*
- * We have a decodedArr of "01" ("1") or "10" ("0")
- * parse it into final decoded dataout
- */
- for (i = 0; i < bitindex; i += 2) {
-
- if ((decodedArr[i] == 0) && (decodedArr[i+1] == 1)) {
- dataout[j++] = 1;
- } else if ((decodedArr[i] == 1) && (decodedArr[i+1] == 0)) {
- dataout[j++] = 0;
- } else {
- i++;
- warnings++;
- PrintAndLog("Unsynchronized, resync...");
- PrintAndLog("(too many of those messages mean the stream is not Manchester encoded)");
-
- if (warnings > 10) {
- PrintAndLog("Error: too many decode errors, aborting.");
- return 0;
- }
- }
- }
-
- PrintAndLog("%s", sprint_hex(dataout, j));
- return j;
- }
-
- void ManchesterDiffDecodedString(const uint8_t* bitstream, size_t len, uint8_t invert){
- /*
- * We have a bitstream of "01" ("1") or "10" ("0")
- * parse it into final decoded bitstream
- */
- int i, j, warnings;
- uint8_t decodedArr[(len/2)+1];
-
- j = warnings = 0;
-
- uint8_t lastbit = 0;
-
- for (i = 0; i < len; i += 2) {
-
- uint8_t first = bitstream[i];
- uint8_t second = bitstream[i+1];
-
- if ( first == second ) {
- ++i;
- ++warnings;
- if (warnings > 10) {
- PrintAndLog("Error: too many decode errors, aborting.");
- return;
- }
- }
- else if ( lastbit != first ) {
- decodedArr[j++] = 0 ^ invert;
- }
- else {
- decodedArr[j++] = 1 ^ invert;
- }
- lastbit = second;
- }
-
- PrintAndLog("%s", sprint_hex(decodedArr, j));
-}
-
-void PrintPaddedManchester( uint8_t* bitStream, size_t len, size_t blocksize){
-
- PrintAndLog(" Manchester decoded : %d bits", len);
-
- uint8_t mod = len % blocksize;
- uint8_t div = len / blocksize;
- int i;
-
- // Now output the bitstream to the scrollback by line of 16 bits
- for (i = 0; i < div*blocksize; i+=blocksize) {
- PrintAndLog(" %s", sprint_bin(bitStream+i,blocksize) );
- }
-
- if ( mod > 0 )
- PrintAndLog(" %s", sprint_bin(bitStream+i, mod) );
-}
-
-/* Sliding DFT
- Smooths out
-*/
-void iceFsk2(int * data, const size_t len){
-
- int i, j;
- int * output = (int* ) malloc(sizeof(int) * len);
- memset(output, 0x00, len);
-
- // for (i=0; i<len-5; ++i){
- // for ( j=1; j <=5; ++j) {
- // output[i] += data[i*j];
- // }
- // output[i] /= 5;
- // }
- int rest = 127;
- int tmp =0;
- for (i=0; i<len; ++i){
- if ( data[i] < 127)
- output[i] = 0;
- else {
- tmp = (100 * (data[i]-rest)) / rest;
- output[i] = (tmp > 60)? 100:0;
- }
- }
-
- for (j=0; j<len; ++j)
- data[j] = output[j];
-
- free(output);
-}
-
projects / proxmark3-svn / blobdiff