Make isBase64() and isInteger() take string_view (#1662)

lib/inc/drogon/utils/Utilities.h

@@ -59,9 +59,13 @@ namespace utils
 {
 /// Determine if the string is an integer
 DROGON_EXPORT bool isInteger(const std::string &str);
+/// Determine if the string is an integer
+DROGON_EXPORT bool isInteger(string_view str);
 
 /// Determine if the string is base64 encoded
 DROGON_EXPORT bool isBase64(const std::string &str);
+/// Determine if the string is base64 encoded
+DROGON_EXPORT bool isBase64(string_view str);
 
 /// Generate random a string
 /**
@@ -102,8 +106,10 @@ DROGON_EXPORT std::set<std::string> splitStringToSet(
 DROGON_EXPORT std::string getUuid();
 
 /// Get the encoded length of base64.
-DROGON_EXPORT size_t base64EncodedLength(unsigned int in_len,
-                                         bool padded = true);
+constexpr size_t base64EncodedLength(unsigned int in_len, bool padded = true)
+{
+    return padded ? ((in_len + 3 - 1) / 3) * 4 : (in_len * 8 + 6 - 1) / 6;
+}
 
 /// Encode the string to base64 format.
 DROGON_EXPORT std::string base64Encode(const unsigned char *bytes_to_encode,
@@ -135,7 +141,10 @@ inline std::string base64EncodeUnpadded(string_view data, bool url_safe = false)
 }
 
 /// Get the decoded length of base64.
-DROGON_EXPORT size_t base64DecodedLength(unsigned int in_len);
+constexpr size_t base64DecodedLength(unsigned int in_len)
+{
+    return (in_len * 3) / 4;
+}
 
 /// Decode the base64 format string.
 DROGON_EXPORT std::string base64Decode(string_view encoded_string);

lib/src/Utilities.cc

@@ -141,11 +141,16 @@ static inline bool isBase64(unsigned char c)
 
 bool isInteger(const std::string &str)
 {
-    for (auto const &c : str)
-    {
-        if (c > '9' || c < '0')
+    for (auto c : str)
+        if (c < '0' || c > '9')
+            return false;
+    return true;
+}
+bool isInteger(string_view str)
+{
+    for (auto c : str)
+        if (c < '0' || c > '9')
             return false;
-    }
     return true;
 }
 
@@ -156,6 +161,13 @@ bool isBase64(const std::string &str)
             return false;
     return true;
 }
+bool isBase64(string_view str)
+{
+    for (auto c : str)
+        if (!isBase64(c))
+            return false;
+    return true;
+}
 
 std::string genRandomString(int length)
 {
@@ -395,11 +407,6 @@ std::string getUuid()
 #endif
 }
 
-size_t base64EncodedLength(unsigned int in_len, bool padded)
-{
-    return padded ? ((in_len + 3 - 1) / 3) * 4 : (in_len * 8 + 6 - 1) / 6;
-}
-
 std::string base64Encode(const unsigned char *bytes_to_encode,
                          unsigned int in_len,
                          bool url_safe,
@@ -460,11 +467,6 @@ std::string base64EncodeUnpadded(const unsigned char *bytes_to_encode,
     return base64Encode(bytes_to_encode, in_len, url_safe, false);
 }
 
-size_t base64DecodedLength(unsigned int in_len)
-{
-    return (in_len * 3) / 4;
-}
-
 std::vector<char> base64DecodeToVector(string_view encoded_string)
 {
     auto in_len = encoded_string.size();