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 // printing and converting functions
 115
 116 void print_hex(const uint8_t * data, const size_t len)
 117 {
 118         size_t i;
 119
 120         for (i=0; i < len; i++)
 121                 printf("%02x ", data[i]);
 122
 123         printf("\n");
 124 }
 125
 126 void print_hex_break(const uint8_t *data, const size_t len, uint8_t breaks) {
 127
 128         int rownum = 0;
 129         printf("[%02d] | ", rownum);
 130         for (int i = 0; i < len; ++i) {
 131
 132                 printf("%02X ", data[i]);
 133
 134                 // check if a line break is needed
 135                 if ( breaks > 0 && !((i+1) % breaks) && (i+1 < len) ) {
 136                         ++rownum;
 137                         printf("\n[%02d] | ", rownum);
 138                 }
 139         }
 140         printf("\n");
 141 }
 142
 143 char *sprint_hex(const uint8_t *data, const size_t len) {
 144
 145         int maxLen = ( len > 1024/3) ? 1024/3 : len;
 146         static char buf[1024];
 147         memset(buf, 0x00, 1024);
 148         char *tmp = buf;
 149         size_t i;
 150
 151         for (i=0; i < maxLen; ++i, tmp += 3)
 152                 sprintf(tmp, "%02x ", (unsigned int) data[i]);
 153
 154         return buf;
 155 }
 156
 157 char *sprint_bin_break(const uint8_t *data, const size_t len, const uint8_t breaks) {
 158         // make sure we don't go beyond our char array memory
 159         int max_len;
 160         if (breaks==0)
 161                 max_len = ( len > MAX_BIN_BREAK_LENGTH ) ? MAX_BIN_BREAK_LENGTH : len;
 162         else
 163                 max_len = ( len+(len/breaks) > MAX_BIN_BREAK_LENGTH ) ? MAX_BIN_BREAK_LENGTH : len+(len/breaks);
 164
 165         static char buf[MAX_BIN_BREAK_LENGTH]; // 3072 + end of line characters if broken at 8 bits
 166         //clear memory
 167         memset(buf, 0x00, sizeof(buf));
 168         char *tmp = buf;
 169
 170         size_t in_index = 0;
 171         // loop through the out_index to make sure we don't go too far
 172         for (size_t out_index=0; out_index < max_len; out_index++) {
 173                 // set character - (should be binary but verify it isn't more than 1 digit)
 174                 if (data[in_index]<10)
 175                         sprintf(tmp++, "%u", (unsigned int) data[in_index]);
 176                 // check if a line break is needed and we have room to print it in our array
 177                 if ( (breaks > 0) && !((in_index+1) % breaks) && (out_index+1 < max_len) ) {
 178                         // increment and print line break
 179                         out_index++;
 180                         sprintf(tmp++, "%s","\n");
 181                 }
 182                 in_index++;
 183         }
 184
 185         return buf;
 186 }
 187
 188 char *sprint_bin(const uint8_t *data, const size_t len) {
 189         return sprint_bin_break(data, len, 0);
 190 }
 191
 192 char *sprint_hex_ascii(const uint8_t *data, const size_t len) {
 193         static char buf[1024];
 194         char *tmp = buf;
 195         memset(buf, 0x00, 1024);
 196         size_t max_len = (len > 255) ? 255 : len;
 197         // max 255 bytes * 3 + 2 characters = 767 in buffer
 198         sprintf(tmp, "%s| ", sprint_hex(data, max_len) );
 199
 200         size_t i = 0;
 201         size_t pos = (max_len * 3)+2;
 202         // add another 255 characters ascii = 1020 characters of buffer used
 203         while(i < max_len) {
 204                 char c = data[i];
 205                 if ( (c < 32) || (c == 127))
 206                         c = '.';
 207                 sprintf(tmp+pos+i, "%c",  c);
 208                 ++i;
 209         }
 210         return buf;
 211 }
 212
 213 char *sprint_ascii(const uint8_t *data, const size_t len) {
 214         static char buf[1024];
 215         char *tmp = buf;
 216         memset(buf, 0x00, 1024);
 217         size_t max_len = (len > 1010) ? 1010 : len;
 218         size_t i = 0;
 219         while(i < max_len){
 220                 char c = data[i];
 221                 tmp[i] = ((c < 32) || (c == 127)) ? '.' : c;
 222                 ++i;
 223         }
 224         return buf;
 225 }
 226
 227 void num_to_bytes(uint64_t n, size_t len, uint8_t* dest)
 228 {
 229         while (len--) {
 230                 dest[len] = (uint8_t) n;
 231                 n >>= 8;
 232         }
 233 }
 234
 235 uint64_t bytes_to_num(uint8_t* src, size_t len)
 236 {
 237         uint64_t num = 0;
 238         while (len--)
 239         {
 240                 num = (num << 8) | (*src);
 241                 src++;
 242         }
 243         return num;
 244 }
 245
 246 void num_to_bytebits(uint64_t   n, size_t len, uint8_t *dest) {
 247         while (len--) {
 248                 dest[len] = n & 1;
 249                 n >>= 1;
 250         }
 251 }
 252
 253 //least significant bit first
 254 void num_to_bytebitsLSBF(uint64_t n, size_t len, uint8_t *dest) {
 255         for(int i = 0 ; i < len ; ++i) {
 256                 dest[i] =  n & 1;
 257                 n >>= 1;
 258         }
 259 }
 260
 261 // Swap bit order on a uint32_t value.  Can be limited by nrbits just use say 8bits reversal
 262 // And clears the rest of the bits.
 263 uint32_t SwapBits(uint32_t value, int nrbits) {
 264         uint32_t newvalue = 0;
 265         for(int i = 0; i < nrbits; i++) {
 266                 newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
 267         }
 268         return newvalue;
 269 }
 270
 271 // aa,bb,cc,dd,ee,ff,gg,hh, ii,jj,kk,ll,mm,nn,oo,pp
 272 // to
 273 // hh,gg,ff,ee,dd,cc,bb,aa, pp,oo,nn,mm,ll,kk,jj,ii
 274 // up to 64 bytes or 512 bits
 275 uint8_t *SwapEndian64(const uint8_t *src, const size_t len, const uint8_t blockSize){
 276         static uint8_t buf[64];
 277         memset(buf, 0x00, 64);
 278         uint8_t *tmp = buf;
 279         for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){
 280                 for (size_t i = 0; i < blockSize; i++){
 281                         tmp[i+(blockSize*block)] = src[(blockSize-1-i)+(blockSize*block)];
 282                 }
 283         }
 284         return tmp;
 285 }
 286
 287 // takes a uint8_t src array, for len items and reverses the byte order in blocksizes (8,16,32,64),
 288 // returns: the dest array contains the reordered src array.
 289 void SwapEndian64ex(const uint8_t *src, const size_t len, const uint8_t blockSize, uint8_t *dest){
 290         for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){
 291                 for (size_t i = 0; i < blockSize; i++){
 292                         dest[i+(blockSize*block)] = src[(blockSize-1-i)+(blockSize*block)];
 293                 }
 294         }
 295 }
 296
 297 //assumes little endian
 298 char * printBits(size_t const size, void const * const ptr)
 299 {
 300     unsigned char *b = (unsigned char*) ptr;
 301     unsigned char byte;
 302         static char buf[1024];
 303         char * tmp = buf;
 304     int i, j;
 305
 306     for (i=size-1;i>=0;i--)
 307     {
 308         for (j=7;j>=0;j--)
 309         {
 310             byte = b[i] & (1<<j);
 311             byte >>= j;
 312             sprintf(tmp, "%u", (unsigned int)byte);
 313                         tmp++;
 314         }
 315     }
 316         return buf;
 317 }
 318
 319 //  -------------------------------------------------------------------------
 320 //  string parameters lib
 321 //  -------------------------------------------------------------------------
 322
 323 //  -------------------------------------------------------------------------
 324 //  line     - param line
 325 //  bg, en   - symbol numbers in param line of beginning and ending parameter
 326 //  paramnum - param number (from 0)
 327 //  -------------------------------------------------------------------------
 328 int param_getptr(const char *line, int *bg, int *en, int paramnum)
 329 {
 330         int i;
 331         int len = strlen(line);
 332
 333         *bg = 0;
 334         *en = 0;
 335
 336   // skip spaces
 337         while (line[*bg] ==' ' || line[*bg]=='\t') (*bg)++;
 338         if (*bg >= len) {
 339                 return 1;
 340         }
 341
 342         for (i = 0; i < paramnum; i++) {
 343                 while (line[*bg]!=' ' && line[*bg]!='\t' && line[*bg] != '\0') (*bg)++;
 344                 while (line[*bg]==' ' || line[*bg]=='\t') (*bg)++;
 345
 346                 if (line[*bg] == '\0') return 1;
 347         }
 348
 349         *en = *bg;
 350         while (line[*en] != ' ' && line[*en] != '\t' && line[*en] != '\0') (*en)++;
 351
 352         (*en)--;
 353
 354         return 0;
 355 }
 356
 357
 358 int param_getlength(const char *line, int paramnum)
 359 {
 360         int bg, en;
 361
 362         if (param_getptr(line, &bg, &en, paramnum)) return 0;
 363
 364         return en - bg + 1;
 365 }
 366
 367 char param_getchar(const char *line, int paramnum) {
 368         return param_getchar_indx(line, 0, paramnum);
 369 }
 370
 371 char param_getchar_indx(const char *line, int indx, int paramnum) {
 372         int bg, en;
 373
 374         if (param_getptr(line, &bg, &en, paramnum)) return 0x00;
 375
 376         if (bg + indx > en)
 377                 return '\0';
 378
 379         return line[bg + indx];
 380 }
 381
 382 uint8_t param_get8(const char *line, int paramnum)
 383 {
 384         return param_get8ex(line, paramnum, 0, 10);
 385 }
 386
 387 /**
 388  * @brief Reads a decimal integer (actually, 0-254, not 255)
 389  * @param line
 390  * @param paramnum
 391  * @return -1 if error
 392  */
 393 uint8_t param_getdec(const char *line, int paramnum, uint8_t *destination)
 394 {
 395         uint8_t val =  param_get8ex(line, paramnum, 255, 10);
 396         if( (int8_t) val == -1) return 1;
 397         (*destination) = val;
 398         return 0;
 399 }
 400 /**
 401  * @brief Checks if param is decimal
 402  * @param line
 403  * @param paramnum
 404  * @return
 405  */
 406 uint8_t param_isdec(const char *line, int paramnum)
 407 {
 408         int bg, en;
 409         //TODO, check more thorougly
 410         if (!param_getptr(line, &bg, &en, paramnum)) return 1;
 411                 //              return strtoul(&line[bg], NULL, 10) & 0xff;
 412
 413         return 0;
 414 }
 415
 416 uint8_t param_get8ex(const char *line, int paramnum, int deflt, int base)
 417 {
 418         int bg, en;
 419
 420         if (!param_getptr(line, &bg, &en, paramnum))
 421                 return strtoul(&line[bg], NULL, base) & 0xff;
 422         else
 423                 return deflt;
 424 }
 425
 426 uint32_t param_get32ex(const char *line, int paramnum, int deflt, int base)
 427 {
 428         int bg, en;
 429
 430         if (!param_getptr(line, &bg, &en, paramnum))
 431                 return strtoul(&line[bg], NULL, base);
 432         else
 433                 return deflt;
 434 }
 435
 436 uint64_t param_get64ex(const char *line, int paramnum, int deflt, int base)
 437 {
 438         int bg, en;
 439
 440         if (!param_getptr(line, &bg, &en, paramnum))
 441                 return strtoull(&line[bg], NULL, base);
 442         else
 443                 return deflt;
 444 }
 445
 446 int param_gethex(const char *line, int paramnum, uint8_t * data, int hexcnt)
 447 {
 448         int bg, en, temp, i;
 449
 450         if (hexcnt % 2)
 451                 return 1;
 452
 453         if (param_getptr(line, &bg, &en, paramnum)) return 1;
 454
 455         if (en - bg + 1 != hexcnt)
 456                 return 1;
 457
 458         for(i = 0; i < hexcnt; i += 2) {
 459                 if (!(isxdigit(line[bg + i]) && isxdigit(line[bg + i + 1])) )   return 1;
 460
 461                 sscanf((char[]){line[bg + i], line[bg + i + 1], 0}, "%X", &temp);
 462                 data[i / 2] = temp & 0xff;
 463         }
 464
 465         return 0;
 466 }
 467 int param_gethex_ex(const char *line, int paramnum, uint8_t * data, int *hexcnt)
 468 {
 469         int bg, en, temp, i;
 470
 471         //if (hexcnt % 2)
 472         //      return 1;
 473
 474         if (param_getptr(line, &bg, &en, paramnum)) return 1;
 475
 476         *hexcnt = en - bg + 1;
 477         if (*hexcnt % 2) //error if not complete hex bytes
 478                 return 1;
 479
 480         for(i = 0; i < *hexcnt; i += 2) {
 481                 if (!(isxdigit(line[bg + i]) && isxdigit(line[bg + i + 1])) )   return 1;
 482
 483                 sscanf((char[]){line[bg + i], line[bg + i + 1], 0}, "%X", &temp);
 484                 data[i / 2] = temp & 0xff;
 485         }
 486
 487         return 0;
 488 }
 489
 490 int param_gethex_to_eol(const char *line, int paramnum, uint8_t * data, int maxdatalen, int *datalen) {
 491         int bg, en;
 492         uint32_t temp;
 493         char buf[5] = {0};
 494
 495         if (param_getptr(line, &bg, &en, paramnum)) return 1;
 496
 497         *datalen = 0;
 498
 499         int indx = bg;
 500         while (line[indx]) {
 501                 if (line[indx] == '\t' || line[indx] == ' ')
 502                         continue;
 503
 504                 if (isxdigit(line[indx])) {
 505                         buf[strlen(buf) + 1] = 0x00;
 506                         buf[strlen(buf)] = line[indx];
 507                 } else {
 508                         // if we have symbols other than spaces and hex
 509                         return 1;
 510                 }
 511
 512                 if (*datalen >= maxdatalen) {
 513                         // if we dont have space in buffer and have symbols to translate
 514                         return 2;
 515                 }
 516
 517                 if (strlen(buf) >= 2) {
 518                         sscanf(buf, "%x", &temp);
 519                         data[*datalen] = (uint8_t)(temp & 0xff);
 520                         *buf = 0;
 521                         (*datalen)++;
 522                 }
 523
 524                 indx++;
 525         }
 526
 527         if (strlen(buf) > 0)
 528                 //error when not completed hex bytes
 529                 return 3;
 530
 531         return 0;
 532 }
 533
 534 int param_getstr(const char *line, int paramnum, char * str, size_t buffersize)
 535 {
 536         int bg, en;
 537
 538         if (param_getptr(line, &bg, &en, paramnum)) {
 539                 return 0;
 540         }
 541
 542         // Prevent out of bounds errors
 543         if (en - bg + 1 >= buffersize) {
 544                 printf("out of bounds error: want %lu bytes have %lu bytes\n", en - bg + 1 + 1, buffersize);
 545                 return 0;
 546         }
 547
 548         memcpy(str, line + bg, en - bg + 1);
 549         str[en - bg + 1] = 0;
 550
 551         return en - bg + 1;
 552 }
 553
 554 /*
 555 The following methods comes from Rfidler sourcecode.
 556 https://github.com/ApertureLabsLtd/RFIDler/blob/master/firmware/Pic32/RFIDler.X/src/
 557 */
 558
 559 // convert hex to sequence of 0/1 bit values
 560 // returns number of bits converted
 561 int hextobinarray(char *target, char *source)
 562 {
 563     int length, i, count= 0;
 564     char* start = source;
 565     char x;
 566
 567     length = strlen(source);
 568     // process 4 bits (1 hex digit) at a time
 569     while(length--)
 570     {
 571         x= *(source++);
 572         // capitalize
 573         if (x >= 'a' && x <= 'f')
 574             x -= 32;
 575         // convert to numeric value
 576         if (x >= '0' && x <= '9')
 577             x -= '0';
 578         else if (x >= 'A' && x <= 'F')
 579             x -= 'A' - 10;
 580         else {
 581                 printf("Discovered unknown character %c %d at idx %d of %s\n", x, x, source - start, start);
 582             return 0;
 583         }
 584         // output
 585         for(i= 0 ; i < 4 ; ++i, ++count)
 586             *(target++)= (x >> (3 - i)) & 1;
 587     }
 588
 589     return count;
 590 }
 591
 592 // convert hex to human readable binary string
 593 int hextobinstring(char *target, char *source)
 594 {
 595     int length;
 596
 597     if(!(length= hextobinarray(target, source)))
 598         return 0;
 599     binarraytobinstring(target, target, length);
 600     return length;
 601 }
 602
 603 // convert binary array of 0x00/0x01 values to hex (safe to do in place as target will always be shorter than source)
 604 // return number of bits converted
 605 int binarraytohex(char *target,char *source, int length)
 606 {
 607     unsigned char i, x;
 608     int j = length;
 609
 610     if(j % 4)
 611         return 0;
 612
 613     while(j)
 614     {
 615         for(i= x= 0 ; i < 4 ; ++i)
 616             x +=  ( source[i] << (3 - i));
 617         sprintf(target,"%X", (unsigned int)x);
 618         ++target;
 619         source += 4;
 620         j -= 4;
 621     }
 622     return length;
 623 }
 624
 625 // convert binary array to human readable binary
 626 void binarraytobinstring(char *target, char *source,  int length)
 627 {
 628     int i;
 629
 630     for(i= 0 ; i < length ; ++i)
 631         *(target++)= *(source++) + '0';
 632     *target= '\0';
 633 }
 634
 635 // return parity bit required to match type
 636 uint8_t GetParity( uint8_t *bits, uint8_t type, int length)
 637 {
 638     int x;
 639
 640     for(x= 0 ; length > 0 ; --length)
 641         x += bits[length - 1];
 642     x %= 2;
 643
 644     return x ^ type;
 645 }
 646
 647 // add HID parity to binary array: EVEN prefix for 1st half of ID, ODD suffix for 2nd half
 648 void wiegand_add_parity(uint8_t *target, uint8_t *source, uint8_t length)
 649 {
 650     *(target++)= GetParity(source, EVEN, length / 2);
 651     memcpy(target, source, length);
 652     target += length;
 653     *(target)= GetParity(source + length / 2, ODD, length / 2);
 654 }
 655
 656 // xor two arrays together for len items.  The dst array contains the new xored values.
 657 void xor(unsigned char *dst, unsigned char *src, size_t len) {
 658    for( ; len > 0; len--,dst++,src++)
 659        *dst ^= *src;
 660 }
 661
 662 int32_t le24toh (uint8_t data[3]) {
 663     return (data[2] << 16) | (data[1] << 8) | data[0];
 664 }
 665 uint32_t le32toh (uint8_t *data) {
 666         return (uint32_t)( (data[3]<<24) | (data[2]<<16) | (data[1]<<8) | data[0]);
 667 }
 668
 669 // RotateLeft - Ultralight, Desfire, works on byte level
 670 // 00-01-02  >> 01-02-00
 671 void rol(uint8_t *data, const size_t len){
 672     uint8_t first = data[0];
 673     for (size_t i = 0; i < len-1; i++) {
 674         data[i] = data[i+1];
 675     }
 676     data[len-1] = first;
 677 }
 678
 679
 680 // Replace unprintable characters with a dot in char buffer
 681 void clean_ascii(unsigned char *buf, size_t len) {
 682   for (size_t i = 0; i < len; i++) {
 683     if (!isprint(buf[i]))
 684       buf[i] = '.';
 685   }
 686 }
 687
 688 // replace \r \n to \0
 689 void strcleanrn(char *buf, size_t len) {
 690         strcreplace(buf, len, '\n', '\0');
 691         strcreplace(buf, len, '\r', '\0');
 692 }
 693
 694 // replace char in buffer
 695 void strcreplace(char *buf, size_t len, char from, char to) {
 696   for (size_t i = 0; i < len; i++) {
 697     if (buf[i] == from)
 698       buf[i] = to;
 699   }
 700 }
 701
 702 char *strmcopy(char *buf) {
 703         char * str = NULL;
 704         if ((str = (char*) malloc(strlen(buf) + 1)) != NULL) {
 705                 memset(str, 0, strlen(buf) + 1);
 706                 strcpy(str, buf);
 707         }
 708         return str;
 709 }
 710
 711
 712 // determine number of logical CPU cores (use for multithreaded functions)
 713 extern int num_CPUs(void)
 714 {
 715 #if defined(_WIN32)
 716         #include <sysinfoapi.h>
 717         SYSTEM_INFO sysinfo;
 718         GetSystemInfo(&sysinfo);
 719         return sysinfo.dwNumberOfProcessors;
 720 #elif defined(__linux__) || defined(__APPLE__)
 721         #include <unistd.h>
 722         return sysconf(_SC_NPROCESSORS_ONLN);
 723 #else
 724         return 1;
 725 #endif
 726 }
 727