updates

my_components/nimble_tracker/string_utils.cpp

@@ -0,0 +1,47 @@
+// Copied from https://github.com/ESPresense/ESPresense/blob/master/lib/BleFingerprint/string_utils.cpp
+#include "string_utils.h"
+
+namespace esphome
+{
+    namespace nimble_tracker
+    {
+
+        static constexpr char hexmap[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+
+        std::string hexStr(const uint8_t *data, int len)
+        {
+            std::string s(len * 2, ' ');
+            for (int i = 0; i < len; ++i)
+            {
+                s[2 * i] = hexmap[(data[i] & 0xF0) >> 4];
+                s[2 * i + 1] = hexmap[data[i] & 0x0F];
+            }
+            return s;
+        }
+
+        uint8_t hextob(char ch)
+        {
+            if (ch >= '0' && ch <= '9')
+                return ch - '0';
+            if (ch >= 'A' && ch <= 'F')
+                return ch - 'A' + 10;
+            if (ch >= 'a' && ch <= 'f')
+                return ch - 'a' + 10;
+            return 0;
+        }
+
+        bool hextostr(const std::string &hexStr, uint8_t *output, size_t len)
+        {
+            if (len & 1)
+                return false;
+            if (hexStr.length() < len * 2)
+                return false;
+            int k = 0;
+            for (size_t i = 0; i < len * 2; i += 2)
+                output[k++] = (hextob(hexStr[i]) << 4) | hextob(hexStr[i + 1]);
+            return true;
+        }
+
+    } // namespace nimble_tracker
+
+} // namespece esphome