implemented advanced search history feature

src/utils/base64.cpp

@@ -91,7 +91,7 @@ bool base64_decode(const string& in, string& out)
 {
     int io = 0, state = 0, ch = 0;
     unsigned int ii = 0;
-    out.erase();
+    out.clear();
     size_t ilen = in.length();
     out.reserve(ilen);
 
@@ -217,7 +217,7 @@ void base64_encode(const string &in, string &out)
     unsigned char input[3];
     unsigned char output[4];
 
-    out.erase();
+    out.clear();
 
     int srclength = in.length();
     int sidx = 0;

src/utils/base64.h

@@ -20,5 +20,18 @@
 
 void base64_encode(const std::string& in, std::string& out);
 bool base64_decode(const std::string& in, std::string& out);
+inline std::string base64_encode(const std::string& in)
+{
+    std::string o;
+    base64_encode(in, o);
+    return o;
+}
+inline std::string base64_decode(const std::string& in)
+{
+    std::string o;
+    if (base64_decode(in, o))
+	return o;
+    return std::string();
+}
 
 #endif /* _BASE64_H_INCLUDED_ */