+uint32_t le32toh (uint8_t *data) {
+ return (uint32_t)( (data[3]<<24) | (data[2]<<16) | (data[1]<<8) | data[0]);
+}
+
+// RotateLeft - Ultralight, Desfire, works on byte level
+// 00-01-02 >> 01-02-00
+void rol(uint8_t *data, const size_t len){
+ uint8_t first = data[0];
+ for (size_t i = 0; i < len-1; i++) {
+ data[i] = data[i+1];
+ }
+ data[len-1] = first;
+}
+
+
+// Replace unprintable characters with a dot in char buffer
+void clean_ascii(unsigned char *buf, size_t len) {
+ for (size_t i = 0; i < len; i++) {
+ if (!isprint(buf[i]))
+ buf[i] = '.';
+ }
+}
+
+
+// Timer functions
+#if !defined (_WIN32)
+#include <errno.h>
+
+static void nsleep(uint64_t n) {
+ struct timespec timeout;
+ timeout.tv_sec = n/1000000000;
+ timeout.tv_nsec = n%1000000000;
+ while (nanosleep(&timeout, &timeout) && errno == EINTR);
+}
+
+void msleep(uint32_t n) {
+ nsleep(1000000 * n);
+}
+
+#endif // _WIN32
+
+// a milliseconds timer for performance measurement
+uint64_t msclock() {
+#if defined(_WIN32)
+ #include <sys/types.h>
+
+ // WORKAROUND FOR MinGW (some versions - use if normal code does not compile)
+ // It has no _ftime_s and needs explicit inclusion of timeb.h
+ #include <sys/timeb.h>
+ struct _timeb t;
+ _ftime(&t);
+ return 1000 * t.time + t.millitm;
+
+ // NORMAL CODE (use _ftime_s)
+ //struct _timeb t;
+ //if (_ftime_s(&t)) {
+ // return 0;
+ //} else {
+ // return 1000 * t.time + t.millitm;
+ //}
+#else
+ struct timespec t;
+ clock_gettime(CLOCK_MONOTONIC, &t);
+ return (t.tv_sec * 1000 + t.tv_nsec / 1000000);
+#endif
+}
+
+// determine number of logical CPU cores (use for multithreaded functions)
+extern int num_CPUs(void)
+{
+#if defined(_WIN32)
+ #include <sysinfoapi.h>
+ SYSTEM_INFO sysinfo;
+ GetSystemInfo(&sysinfo);
+ return sysinfo.dwNumberOfProcessors;
+#elif defined(__linux__) || defined(__APPLE__)
+ #include <unistd.h>
+ return sysconf(_SC_NPROCESSORS_ONLN);
+#else
+ return 1;
+#endif
+}