cvs.zerfleddert.de Git - proxmark3-svn/blob - client/util.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // utilities
   9 //-----------------------------------------------------------------------------
  10
  11 #include "util.h"
  12
  13 #include <stdint.h>
  14 #include <string.h>
  15 #include <ctype.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <time.h>
  19 #include "data.h"
  20
  21 #ifdef _WIN32
  22 #include <windows.h>
  23 #endif
  24
  25 #define MAX_BIN_BREAK_LENGTH   (3072+384+1)
  26
  27 #ifndef _WIN32
  28 #include <termios.h>
  29 #include <sys/ioctl.h>
  30 #include <unistd.h>
  31
  32 int ukbhit(void)
  33 {
  34   int cnt = 0;
  35   int error;
  36   static struct termios Otty, Ntty;
  37
  38   if ( tcgetattr(STDIN_FILENO, &Otty) == -1 ) return -1;
  39   Ntty = Otty;
  40
  41   Ntty.c_iflag          = 0x0000;   // input mode
  42   Ntty.c_oflag          = 0x0000;   // output mode
  43   Ntty.c_lflag         &= ~ICANON;  // control mode = raw
  44   Ntty.c_cc[VMIN]       = 1;        // return if at least 1 character is in the queue
  45   Ntty.c_cc[VTIME]      = 0;        // no timeout. Wait forever
  46
  47   if (0 == (error = tcsetattr(STDIN_FILENO, TCSANOW, &Ntty))) {   // set new attributes
  48     error += ioctl(STDIN_FILENO, FIONREAD, &cnt);                 // get number of characters availabe
  49     error += tcsetattr(STDIN_FILENO, TCSANOW, &Otty);             // reset attributes
  50   }
  51
  52   return ( error == 0 ? cnt : -1 );
  53 }
  54
  55 #else
  56
  57 #include <conio.h>
  58 int ukbhit(void) {
  59         return kbhit();
  60 }
  61 #endif
  62
  63 // log files functions
  64 void AddLogLine(char *file, char *extData, char *c) {
  65         FILE *fLog = NULL;
  66     char filename[FILE_PATH_SIZE] = {0x00};
  67     int len = 0;
  68
  69     len = strlen(file);
  70     if (len > FILE_PATH_SIZE) len = FILE_PATH_SIZE;
  71     memcpy(filename, file, len);
  72
  73         fLog = fopen(filename, "a");
  74         if (!fLog) {
  75                 printf("Could not append log file %s", filename);
  76                 return;
  77         }
  78
  79         fprintf(fLog, "%s", extData);
  80         fprintf(fLog, "%s\n", c);
  81         fclose(fLog);
  82 }
  83
  84 void AddLogHex(char *fileName, char *extData, const uint8_t * data, const size_t len){
  85         AddLogLine(fileName, extData, sprint_hex(data, len));
  86 }
  87
  88 void AddLogUint64(char *fileName, char *extData, const uint64_t data) {
  89   char buf[100] = {0};
  90         sprintf(buf, "%x%x", (unsigned int)((data & 0xFFFFFFFF00000000) >> 32), (unsigned int)(data & 0xFFFFFFFF));
  91         AddLogLine(fileName, extData, buf);
  92 }
  93
  94 void AddLogCurrentDT(char *fileName) {
  95         char buff[20];
  96         struct tm *curTime;
  97
  98         time_t now = time(0);
  99         curTime = gmtime(&now);
 100
 101         strftime (buff, sizeof(buff), "%Y-%m-%d %H:%M:%S", curTime);
 102         AddLogLine(fileName, "\nanticollision: ", buff);
 103 }
 104
 105 void FillFileNameByUID(char *fileName, uint8_t * uid, char *ext, int byteCount) {
 106         char * fnameptr = fileName;
 107         memset(fileName, 0x00, 200);
 108
 109         for (int j = 0; j < byteCount; j++, fnameptr += 2)
 110                 sprintf(fnameptr, "%02x", (unsigned int) uid[j]);
 111         sprintf(fnameptr, "%s", ext);
 112 }
 113
 114 void hex_to_buffer(const uint8_t *buf, const uint8_t *hex_data, const size_t hex_len, const size_t hex_max_len,
 115         const size_t min_str_len, const size_t spaces_between, bool uppercase) {
 116
 117         char *tmp = (char *)buf;
 118         size_t i;
 119         memset(tmp, 0x00, hex_max_len);
 120
 121         int maxLen = ( hex_len > hex_max_len) ? hex_max_len : hex_len;
 122
 123         for (i = 0; i < maxLen; ++i, tmp += 2 + spaces_between) {
 124                 sprintf(tmp, (uppercase) ? "%02X" : "%02x", (unsigned int) hex_data[i]);
 125
 126                 for (int j = 0; j < spaces_between; j++)
 127                         sprintf(tmp + 2 + j, " ");
 128         }
 129
 130         i *= (2 + spaces_between);
 131         int minStrLen = min_str_len > i ? min_str_len : 0;
 132         if (minStrLen > hex_max_len)
 133                 minStrLen = hex_max_len;
 134         for(; i < minStrLen; i++, tmp += 1)
 135                 sprintf(tmp, " ");
 136
 137         return;
 138 }
 139
 140 // printing and converting functions
 141
 142 void print_hex(const uint8_t * data, const size_t len)
 143 {
 144         size_t i;
 145
 146         for (i=0; i < len; i++)
 147                 printf("%02x ", data[i]);
 148
 149         printf("\n");
 150 }
 151
 152 void print_hex_break(const uint8_t *data, const size_t len, uint8_t breaks) {
 153
 154         int rownum = 0;
 155         printf("[%02d] | ", rownum);
 156         for (int i = 0; i < len; ++i) {
 157
 158                 printf("%02X ", data[i]);
 159
 160                 // check if a line break is needed
 161                 if ( breaks > 0 && !((i+1) % breaks) && (i+1 < len) ) {
 162                         ++rownum;
 163                         printf("\n[%02d] | ", rownum);
 164                 }
 165         }
 166         printf("\n");
 167 }
 168
 169 char *sprint_hex(const uint8_t *data, const size_t len) {
 170         static char buf[1025] = {0};
 171
 172         hex_to_buffer((uint8_t *)buf, data, len, sizeof(buf) - 1, 0, 1, false);
 173
 174         return buf;
 175 }
 176
 177 char *sprint_hex_inrow_ex(const uint8_t *data, const size_t len, const size_t min_str_len) {
 178         static char buf[1025] = {0};
 179
 180         hex_to_buffer((uint8_t *)buf, data, len, sizeof(buf) - 1, min_str_len, 0, false);
 181
 182         return buf;
 183 }
 184
 185 char *sprint_hex_inrow(const uint8_t *data, const size_t len) {
 186         return sprint_hex_inrow_ex(data, len, 0);
 187 }
 188
 189 char *sprint_bin_break(const uint8_t *data, const size_t len, const uint8_t breaks) {
 190         // make sure we don't go beyond our char array memory
 191         int max_len;
 192         if (breaks==0)
 193                 max_len = ( len > MAX_BIN_BREAK_LENGTH ) ? MAX_BIN_BREAK_LENGTH : len;
 194         else
 195                 max_len = ( len+(len/breaks) > MAX_BIN_BREAK_LENGTH ) ? MAX_BIN_BREAK_LENGTH : len+(len/breaks);
 196
 197         static char buf[MAX_BIN_BREAK_LENGTH]; // 3072 + end of line characters if broken at 8 bits
 198         //clear memory
 199         memset(buf, 0x00, sizeof(buf));
 200         char *tmp = buf;
 201
 202         size_t in_index = 0;
 203         // loop through the out_index to make sure we don't go too far
 204         for (size_t out_index=0; out_index < max_len; out_index++) {
 205                 // set character - (should be binary but verify it isn't more than 1 digit)
 206                 if (data[in_index]<10)
 207                         sprintf(tmp++, "%u", (unsigned int) data[in_index]);
 208                 // check if a line break is needed and we have room to print it in our array
 209                 if ( (breaks > 0) && !((in_index+1) % breaks) && (out_index+1 < max_len) ) {
 210                         // increment and print line break
 211                         out_index++;
 212                         sprintf(tmp++, "%s","\n");
 213                 }
 214                 in_index++;
 215         }
 216
 217         return buf;
 218 }
 219
 220 char *sprint_bin(const uint8_t *data, const size_t len) {
 221         return sprint_bin_break(data, len, 0);
 222 }
 223
 224 char *sprint_hex_ascii(const uint8_t *data, const size_t len) {
 225         static char buf[1024];
 226         char *tmp = buf;
 227         memset(buf, 0x00, 1024);
 228         size_t max_len = (len > 255) ? 255 : len;
 229         // max 255 bytes * 3 + 2 characters = 767 in buffer
 230         sprintf(tmp, "%s| ", sprint_hex(data, max_len) );
 231
 232         size_t i = 0;
 233         size_t pos = (max_len * 3)+2;
 234         // add another 255 characters ascii = 1020 characters of buffer used
 235         while(i < max_len) {
 236                 char c = data[i];
 237                 if ( (c < 32) || (c == 127))
 238                         c = '.';
 239                 sprintf(tmp+pos+i, "%c",  c);
 240                 ++i;
 241         }
 242         return buf;
 243 }
 244
 245 char *sprint_ascii_ex(const uint8_t *data, const size_t len, const size_t min_str_len) {
 246         static char buf[1024];
 247         char *tmp = buf;
 248         memset(buf, 0x00, 1024);
 249         size_t max_len = (len > 1010) ? 1010 : len;
 250         size_t i = 0;
 251         while(i < max_len){
 252                 char c = data[i];
 253                 tmp[i] = ((c < 32) || (c == 127)) ? '.' : c;
 254                 ++i;
 255         }
 256
 257         int minStrLen = min_str_len > i ? min_str_len : 0;
 258         for(; i < minStrLen; ++i)
 259                 tmp[i] = ' ';
 260
 261         return buf;
 262 }
 263
 264 char *sprint_ascii(const uint8_t *data, const size_t len) {
 265         return sprint_ascii_ex(data, len, 0);
 266 }
 267
 268 void num_to_bytes(uint64_t n, size_t len, uint8_t* dest)
 269 {
 270         while (len--) {
 271                 dest[len] = (uint8_t) n;
 272                 n >>= 8;
 273         }
 274 }
 275
 276 uint64_t bytes_to_num(uint8_t* src, size_t len)
 277 {
 278         uint64_t num = 0;
 279         while (len--)
 280         {
 281                 num = (num << 8) | (*src);
 282                 src++;
 283         }
 284         return num;
 285 }
 286
 287 void num_to_bytebits(uint64_t   n, size_t len, uint8_t *dest) {
 288         while (len--) {
 289                 dest[len] = n & 1;
 290                 n >>= 1;
 291         }
 292 }
 293
 294 //least significant bit first
 295 void num_to_bytebitsLSBF(uint64_t n, size_t len, uint8_t *dest) {
 296         for(int i = 0 ; i < len ; ++i) {
 297                 dest[i] =  n & 1;
 298                 n >>= 1;
 299         }
 300 }
 301
 302 // Swap bit order on a uint32_t value.  Can be limited by nrbits just use say 8bits reversal
 303 // And clears the rest of the bits.
 304 uint32_t SwapBits(uint32_t value, int nrbits) {
 305         uint32_t newvalue = 0;
 306         for(int i = 0; i < nrbits; i++) {
 307                 newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
 308         }
 309         return newvalue;
 310 }
 311
 312 // aa,bb,cc,dd,ee,ff,gg,hh, ii,jj,kk,ll,mm,nn,oo,pp
 313 // to
 314 // hh,gg,ff,ee,dd,cc,bb,aa, pp,oo,nn,mm,ll,kk,jj,ii
 315 // up to 64 bytes or 512 bits
 316 uint8_t *SwapEndian64(const uint8_t *src, const size_t len, const uint8_t blockSize){
 317         static uint8_t buf[64];
 318         memset(buf, 0x00, 64);
 319         uint8_t *tmp = buf;
 320         for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){
 321                 for (size_t i = 0; i < blockSize; i++){
 322                         tmp[i+(blockSize*block)] = src[(blockSize-1-i)+(blockSize*block)];
 323                 }
 324         }
 325         return tmp;
 326 }
 327
 328 // takes a uint8_t src array, for len items and reverses the byte order in blocksizes (8,16,32,64),
 329 // returns: the dest array contains the reordered src array.
 330 void SwapEndian64ex(const uint8_t *src, const size_t len, const uint8_t blockSize, uint8_t *dest){
 331         for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){
 332                 for (size_t i = 0; i < blockSize; i++){
 333                         dest[i+(blockSize*block)] = src[(blockSize-1-i)+(blockSize*block)];
 334                 }
 335         }
 336 }
 337
 338 //assumes little endian
 339 char * printBits(size_t const size, void const * const ptr)
 340 {
 341     unsigned char *b = (unsigned char*) ptr;
 342     unsigned char byte;
 343         static char buf[1024];
 344         char * tmp = buf;
 345     int i, j;
 346
 347     for (i=size-1;i>=0;i--)
 348     {
 349         for (j=7;j>=0;j--)
 350         {
 351             byte = b[i] & (1<<j);
 352             byte >>= j;
 353             sprintf(tmp, "%u", (unsigned int)byte);
 354                         tmp++;
 355         }
 356     }
 357         return buf;
 358 }
 359
 360 char * printBitsPar(const uint8_t *b, size_t len) {
 361         static char buf1[512] = {0};
 362         static char buf2[512] = {0};
 363         static char *buf;
 364         if (buf != buf1)
 365                 buf = buf1;
 366         else
 367                 buf = buf2;
 368         memset(buf, 0x00, 512);
 369
 370         for (int i = 0; i < len; i++) {
 371                 buf[i] = ((b[i / 8] << (i % 8)) & 0x80) ? '1':'0';
 372         }
 373         return buf;
 374 }
 375
 376
 377 //  -------------------------------------------------------------------------
 378 //  string parameters lib
 379 //  -------------------------------------------------------------------------
 380
 381 //  -------------------------------------------------------------------------
 382 //  line     - param line
 383 //  bg, en   - symbol numbers in param line of beginning and ending parameter
 384 //  paramnum - param number (from 0)
 385 //  -------------------------------------------------------------------------
 386 int param_getptr(const char *line, int *bg, int *en, int paramnum)
 387 {
 388         int i;
 389         int len = strlen(line);
 390
 391         *bg = 0;
 392         *en = 0;
 393
 394   // skip spaces
 395         while (line[*bg] ==' ' || line[*bg]=='\t') (*bg)++;
 396         if (*bg >= len) {
 397                 return 1;
 398         }
 399
 400         for (i = 0; i < paramnum; i++) {
 401                 while (line[*bg]!=' ' && line[*bg]!='\t' && line[*bg] != '\0') (*bg)++;
 402                 while (line[*bg]==' ' || line[*bg]=='\t') (*bg)++;
 403
 404                 if (line[*bg] == '\0') return 1;
 405         }
 406
 407         *en = *bg;
 408         while (line[*en] != ' ' && line[*en] != '\t' && line[*en] != '\0') (*en)++;
 409
 410         (*en)--;
 411
 412         return 0;
 413 }
 414
 415
 416 int param_getlength(const char *line, int paramnum)
 417 {
 418         int bg, en;
 419
 420         if (param_getptr(line, &bg, &en, paramnum)) return 0;
 421
 422         return en - bg + 1;
 423 }
 424
 425 char param_getchar(const char *line, int paramnum) {
 426         return param_getchar_indx(line, 0, paramnum);
 427 }
 428
 429 char param_getchar_indx(const char *line, int indx, int paramnum) {
 430         int bg, en;
 431
 432         if (param_getptr(line, &bg, &en, paramnum)) return 0x00;
 433
 434         if (bg + indx > en)
 435                 return '\0';
 436
 437         return line[bg + indx];
 438 }
 439
 440 uint8_t param_get8(const char *line, int paramnum)
 441 {
 442         return param_get8ex(line, paramnum, 0, 10);
 443 }
 444
 445 /**
 446  * @brief Reads a decimal integer (actually, 0-254, not 255)
 447  * @param line
 448  * @param paramnum
 449  * @return -1 if error
 450  */
 451 uint8_t param_getdec(const char *line, int paramnum, uint8_t *destination)
 452 {
 453         uint8_t val =  param_get8ex(line, paramnum, 255, 10);
 454         if( (int8_t) val == -1) return 1;
 455         (*destination) = val;
 456         return 0;
 457 }
 458 /**
 459  * @brief Checks if param is decimal
 460  * @param line
 461  * @param paramnum
 462  * @return
 463  */
 464 uint8_t param_isdec(const char *line, int paramnum)
 465 {
 466         int bg, en;
 467         //TODO, check more thorougly
 468         if (!param_getptr(line, &bg, &en, paramnum)) return 1;
 469                 //              return strtoul(&line[bg], NULL, 10) & 0xff;
 470
 471         return 0;
 472 }
 473
 474 uint8_t param_get8ex(const char *line, int paramnum, int deflt, int base)
 475 {
 476         int bg, en;
 477
 478         if (!param_getptr(line, &bg, &en, paramnum))
 479                 return strtoul(&line[bg], NULL, base) & 0xff;
 480         else
 481                 return deflt;
 482 }
 483
 484 uint32_t param_get32ex(const char *line, int paramnum, int deflt, int base)
 485 {
 486         int bg, en;
 487
 488         if (!param_getptr(line, &bg, &en, paramnum))
 489                 return strtoul(&line[bg], NULL, base);
 490         else
 491                 return deflt;
 492 }
 493
 494 uint64_t param_get64ex(const char *line, int paramnum, int deflt, int base)
 495 {
 496         int bg, en;
 497
 498         if (!param_getptr(line, &bg, &en, paramnum))
 499                 return strtoull(&line[bg], NULL, base);
 500         else
 501                 return deflt;
 502 }
 503
 504 int param_gethex(const char *line, int paramnum, uint8_t * data, int hexcnt)
 505 {
 506         int bg, en, temp, i;
 507
 508         if (hexcnt % 2)
 509                 return 1;
 510
 511         if (param_getptr(line, &bg, &en, paramnum)) return 1;
 512
 513         if (en - bg + 1 != hexcnt)
 514                 return 1;
 515
 516         for(i = 0; i < hexcnt; i += 2) {
 517                 if (!(isxdigit((unsigned char)line[bg + i]) && isxdigit((unsigned char)line[bg + i + 1])) )     return 1;
 518
 519                 sscanf((char[]){line[bg + i], line[bg + i + 1], 0}, "%X", &temp);
 520                 data[i / 2] = temp & 0xff;
 521         }
 522
 523         return 0;
 524 }
 525 int param_gethex_ex(const char *line, int paramnum, uint8_t * data, int *hexcnt)
 526 {
 527         int bg, en, temp, i;
 528
 529         //if (hexcnt % 2)
 530         //      return 1;
 531
 532         if (param_getptr(line, &bg, &en, paramnum)) return 1;
 533
 534         *hexcnt = en - bg + 1;
 535         if (*hexcnt % 2) //error if not complete hex bytes
 536                 return 1;
 537
 538         for(i = 0; i < *hexcnt; i += 2) {
 539                 if (!(isxdigit((unsigned char)line[bg + i]) && isxdigit((unsigned char)line[bg + i + 1])) )     return 1;
 540
 541                 sscanf((char[]){line[bg + i], line[bg + i + 1], 0}, "%X", &temp);
 542                 data[i / 2] = temp & 0xff;
 543         }
 544
 545         return 0;
 546 }
 547
 548 int param_gethex_to_eol(const char *line, int paramnum, uint8_t * data, int maxdatalen, int *datalen) {
 549         int bg, en;
 550         uint32_t temp;
 551         char buf[5] = {0};
 552
 553         if (param_getptr(line, &bg, &en, paramnum)) return 1;
 554
 555         *datalen = 0;
 556
 557         int indx = bg;
 558         while (line[indx]) {
 559                 if (line[indx] == '\t' || line[indx] == ' ') {
 560                         indx++;
 561                         continue;
 562                 }
 563
 564                 if (isxdigit((unsigned char)line[indx])) {
 565                         buf[strlen(buf) + 1] = 0x00;
 566                         buf[strlen(buf)] = line[indx];
 567                 } else {
 568                         // if we have symbols other than spaces and hex
 569                         return 1;
 570                 }
 571
 572                 if (*datalen >= maxdatalen) {
 573                         // if we dont have space in buffer and have symbols to translate
 574                         return 2;
 575                 }
 576
 577                 if (strlen(buf) >= 2) {
 578                         sscanf(buf, "%x", &temp);
 579                         data[*datalen] = (uint8_t)(temp & 0xff);
 580                         *buf = 0;
 581                         (*datalen)++;
 582                 }
 583
 584                 indx++;
 585         }
 586
 587         if (strlen(buf) > 0)
 588                 //error when not completed hex bytes
 589                 return 3;
 590
 591         return 0;
 592 }
 593
 594 int param_getstr(const char *line, int paramnum, char * str, size_t buffersize)
 595 {
 596         int bg, en;
 597
 598         if (param_getptr(line, &bg, &en, paramnum)) {
 599                 return 0;
 600         }
 601
 602         // Prevent out of bounds errors
 603         if (en - bg + 1 >= buffersize) {
 604                 printf("out of bounds error: want %d bytes have %zd bytes\n", en - bg + 1 + 1, buffersize);
 605                 return 0;
 606         }
 607
 608         memcpy(str, line + bg, en - bg + 1);
 609         str[en - bg + 1] = 0;
 610
 611         return en - bg + 1;
 612 }
 613
 614 /*
 615 The following methods comes from Rfidler sourcecode.
 616 https://github.com/ApertureLabsLtd/RFIDler/blob/master/firmware/Pic32/RFIDler.X/src/
 617 */
 618
 619 // convert hex to sequence of 0/1 bit values
 620 // returns number of bits converted
 621 int hextobinarray(char *target, char *source)
 622 {
 623     int length, i, count= 0;
 624     char* start = source;
 625     char x;
 626
 627     length = strlen(source);
 628     // process 4 bits (1 hex digit) at a time
 629     while(length--)
 630     {
 631         x= *(source++);
 632         // capitalize
 633         if (x >= 'a' && x <= 'f')
 634             x -= 32;
 635         // convert to numeric value
 636         if (x >= '0' && x <= '9')
 637             x -= '0';
 638         else if (x >= 'A' && x <= 'F')
 639             x -= 'A' - 10;
 640         else {
 641                 printf("Discovered unknown character %c %d at idx %tu of %s\n", x, x, source - start, start);
 642             return 0;
 643         }
 644         // output
 645         for(i= 0 ; i < 4 ; ++i, ++count)
 646             *(target++)= (x >> (3 - i)) & 1;
 647     }
 648
 649     return count;
 650 }
 651
 652 // convert hex to human readable binary string
 653 int hextobinstring(char *target, char *source)
 654 {
 655     int length;
 656
 657     if(!(length= hextobinarray(target, source)))
 658         return 0;
 659     binarraytobinstring(target, target, length);
 660     return length;
 661 }
 662
 663 // convert binary array of 0x00/0x01 values to hex (safe to do in place as target will always be shorter than source)
 664 // return number of bits converted
 665 int binarraytohex(char *target,char *source, int length)
 666 {
 667     unsigned char i, x;
 668     int j = length;
 669
 670     if(j % 4)
 671         return 0;
 672
 673     while(j)
 674     {
 675         for(i= x= 0 ; i < 4 ; ++i)
 676             x +=  ( source[i] << (3 - i));
 677         sprintf(target,"%X", (unsigned int)x);
 678         ++target;
 679         source += 4;
 680         j -= 4;
 681     }
 682     return length;
 683 }
 684
 685 // convert binary array to human readable binary
 686 void binarraytobinstring(char *target, char *source,  int length)
 687 {
 688     int i;
 689
 690     for(i= 0 ; i < length ; ++i)
 691         *(target++)= *(source++) + '0';
 692     *target= '\0';
 693 }
 694
 695 // return parity bit required to match type
 696 uint8_t GetParity( uint8_t *bits, uint8_t type, int length)
 697 {
 698     int x;
 699
 700     for(x= 0 ; length > 0 ; --length)
 701         x += bits[length - 1];
 702     x %= 2;
 703
 704     return x ^ type;
 705 }
 706
 707 // add HID parity to binary array: EVEN prefix for 1st half of ID, ODD suffix for 2nd half
 708 void wiegand_add_parity(uint8_t *target, uint8_t *source, uint8_t length)
 709 {
 710     *(target++)= GetParity(source, EVEN, length / 2);
 711     memcpy(target, source, length);
 712     target += length;
 713     *(target)= GetParity(source + length / 2, ODD, length / 2);
 714 }
 715
 716 // xor two arrays together for len items.  The dst array contains the new xored values.
 717 void xor(unsigned char *dst, unsigned char *src, size_t len) {
 718    for( ; len > 0; len--,dst++,src++)
 719        *dst ^= *src;
 720 }
 721
 722 int32_t le24toh (uint8_t data[3]) {
 723     return (data[2] << 16) | (data[1] << 8) | data[0];
 724 }
 725 uint32_t le32toh (uint8_t *data) {
 726         return (uint32_t)( (data[3]<<24) | (data[2]<<16) | (data[1]<<8) | data[0]);
 727 }
 728
 729 // RotateLeft - Ultralight, Desfire, works on byte level
 730 // 00-01-02  >> 01-02-00
 731 void rol(uint8_t *data, const size_t len){
 732     uint8_t first = data[0];
 733     for (size_t i = 0; i < len-1; i++) {
 734         data[i] = data[i+1];
 735     }
 736     data[len-1] = first;
 737 }
 738
 739
 740 // Replace unprintable characters with a dot in char buffer
 741 void clean_ascii(unsigned char *buf, size_t len) {
 742   for (size_t i = 0; i < len; i++) {
 743     if (!isprint(buf[i]))
 744       buf[i] = '.';
 745   }
 746 }
 747
 748 // replace \r \n to \0
 749 void strcleanrn(char *buf, size_t len) {
 750         strcreplace(buf, len, '\n', '\0');
 751         strcreplace(buf, len, '\r', '\0');
 752 }
 753
 754 // replace char in buffer
 755 void strcreplace(char *buf, size_t len, char from, char to) {
 756   for (size_t i = 0; i < len; i++) {
 757     if (buf[i] == from)
 758       buf[i] = to;
 759   }
 760 }
 761
 762 char *strmcopy(char *buf) {
 763         char * str = NULL;
 764         if ((str = (char*) malloc(strlen(buf) + 1)) != NULL) {
 765                 memset(str, 0, strlen(buf) + 1);
 766                 strcpy(str, buf);
 767         }
 768         return str;
 769 }
 770
 771
 772 // determine number of logical CPU cores (use for multithreaded functions)
 773 extern int num_CPUs(void)
 774 {
 775 #if defined(_WIN32)
 776         #include <sysinfoapi.h>
 777         SYSTEM_INFO sysinfo;
 778         GetSystemInfo(&sysinfo);
 779         return sysinfo.dwNumberOfProcessors;
 780 #elif defined(__linux__) || defined(__APPLE__)
 781         #include <unistd.h>
 782         return sysconf(_SC_NPROCESSORS_ONLN);
 783 #else
 784         return 1;
 785 #endif
 786 }
 787