Reduce the call to tolower() for each character when the string is already in lower case.

- only a minor performance gain according to the MSVC profiler

apps/opencs/model/world/infocollection.cpp

@@ -106,10 +106,11 @@ int CSMWorld::InfoCollection::getInfoIndex (const std::string& id, const std::st
         return -1;
 
     // brute force loop
+    std::string lowerId = Misc::StringUtils::lowerCase (id);
     for (std::vector<std::pair<std::string, int> >::const_iterator it = iter->second.begin();
             it != iter->second.end(); ++it)
     {
-        if (Misc::StringUtils::ciEqual(it->first, id))
+        if (Misc::StringUtils::cEqual(it->first, lowerId))
             return it->second;
     }
 

components/misc/stringops.hpp

@@ -35,6 +35,20 @@ public:
         return true;
     }
 
+    static bool cEqual(const std::string &x, const std::string &y) {
+        if (x.size() != y.size()) {
+            return false;
+        }
+        std::string::const_iterator xit = x.begin();
+        std::string::const_iterator yit = y.begin();
+        for (; xit != x.end(); ++xit, ++yit) {
+            if (*xit != *yit) {
+                return false;
+            }
+        }
+        return true;
+    }
+
     static int ciCompareLen(const std::string &x, const std::string &y, size_t len)
     {
         std::string::const_iterator xit = x.begin();