add hex decode function with const char*

Author: fabik111

src/hex/hex.cpp

@@ -28,9 +28,13 @@ namespace arduino { namespace hex {
     }
 
     bool decode(const String in, uint8_t* out, uint32_t size) {
+        return decode(in.c_str(), out, size);
+    }
+
+    bool decode(const char *in, uint8_t* out, uint32_t size) {
         unsigned int byteNumber;
-        byteNumber = chex_decode(out, size, in.begin(), in.length());
-        return byteNumber * 2  == in.length();
+        byteNumber = chex_decode(out, size, in, strlen(in));
+        return byteNumber * 2  == strlen(in);
     }
 
 }} // arduino::hex

src/hex/hex.h

@@ -20,7 +20,7 @@ namespace arduino { namespace hex {
 
     String encode(const uint8_t* in, uint32_t size);
     String encodeUpper(const uint8_t* in, uint32_t size);
-
+    bool decode(const char *in, uint8_t* out, uint32_t size);
     bool decode(const String in, uint8_t* out, uint32_t size);
 }} // arduino::hex
 
@@ -37,4 +37,7 @@ class THEXT {
         return arduino::hex::decode(in, out, size);
     }
 
+    static inline bool decode(const char *in, uint8_t* out, uint32_t size) {
+        return arduino::hex::decode(in, out, size);
+    }
 };