Couple of minor fixes to CharacterFunctions, and added a find-character method.

modules/juce_core/memory/juce_MemoryBlock.cpp

@@ -382,7 +382,7 @@ static const char base64DecodingTable[] =
 
 bool MemoryBlock::fromBase64Encoding (StringRef s)
 {
-    String::CharPointerType dot (CharacterFunctions::find (s.text, CharPointer_ASCII (".")));
+    String::CharPointerType dot (CharacterFunctions::find (s.text, (juce_wchar) '.'));
 
     if (dot.isEmpty())
         return false;

modules/juce_core/text/juce_CharPointer_UTF8.h

@@ -118,6 +118,7 @@ public:
     /** Moves this pointer along to the next character in the string. */
     CharPointer_UTF8& operator++() noexcept
     {
+        jassert (*data != 0); // trying to advance past the end of the string?
         const signed char n = (signed char) *data++;
 
         if (n < 0)

modules/juce_core/text/juce_CharacterFunctions.h

@@ -428,12 +428,14 @@ public:
     {
         for (;;)
         {
-            const int c1 = (int) s1.toUpperCase(); ++s1;
-            const int c2 = (int) s2.toUpperCase(); ++s2;
+            const int c1 = (int) s1.toUpperCase();
+            const int c2 = (int) s2.toUpperCase();
             const int diff = c1 - c2;
 
             if (diff != 0)  return diff < 0 ? -1 : 1;
             if (c1 == 0)    break;
+
+             ++s1; ++s2;
         }
 
         return 0;
@@ -445,12 +447,14 @@ public:
     {
         while (--maxChars >= 0)
         {
-            const int c1 = (int) s1.toUpperCase(); ++s1;
-            const int c2 = (int) s2.toUpperCase(); ++s2;
+            const int c1 = (int) s1.toUpperCase();
+            const int c2 = (int) s2.toUpperCase();
             const int diff = c1 - c2;
 
             if (diff != 0)  return diff < 0 ? -1 : 1;
             if (c1 == 0)    break;
+
+             ++s1; ++s2;
         }
 
         return 0;
@@ -493,6 +497,24 @@ public:
         return textToSearch;
     }
 
+    /** Returns a pointer to the first occurrence of a substring in a string.
+        If the substring is not found, this will return a pointer to the string's
+        null terminator.
+    */
+    template <typename CharPointerType>
+    static CharPointerType find (CharPointerType textToSearch, const juce_wchar charToLookFor) noexcept
+    {
+        for (;; ++textToSearch)
+        {
+            const juce_wchar c = *textToSearch;
+
+            if (c == charToLookFor || c == 0)
+                break;
+        }
+
+        return textToSearch;
+    }
+
     /** Finds the character index of a given substring in another string, using
         a case-independent match.
         Returns -1 if the substring is not found.

modules/juce_gui_basics/drawables/juce_SVGParser.cpp

@@ -965,7 +965,7 @@ private:
 
             if (! openBrace.isEmpty())
             {
-                String::CharPointerType closeBrace = CharacterFunctions::find (openBrace, CharPointer_ASCII ("}"));
+                String::CharPointerType closeBrace = CharacterFunctions::find (openBrace, (juce_wchar) '}');
 
                 if (closeBrace != openBrace)
                 {