fix: make info strings case insensitive (#871)

src/ObjCommon/InfoString/InfoString.h

@@ -1,6 +1,8 @@
 #pragma once
 
 #include "Obj/Gdt/GdtEntry.h"
+#include "Utils/StreamUtils.h"
+#include "Utils/StringUtils.h"
 
 #include <istream>
 #include <string>
@@ -9,13 +11,9 @@
 
 class InfoString
 {
-    static constexpr const char* GDT_PREFIX_FIELD = "configstringFileType";
-
-    static const std::string EMPTY_VALUE;
-    std::unordered_map<std::string, std::string> m_values;
-    std::vector<std::string> m_keys_by_insertion;
-
 public:
+    InfoString() = default;
+
     [[nodiscard]] bool HasKey(const std::string& key) const;
     [[nodiscard]] const std::string& GetValueForKey(const std::string& key) const;
     const std::string& GetValueForKey(const std::string& key, bool* foundValue) const;
@@ -29,4 +27,28 @@ public:
     bool FromStream(std::istream& stream);
     bool FromStream(const std::string& prefix, std::istream& stream);
     bool FromGdtProperties(const GdtEntry& gdtEntry);
+
+private:
+    class HashValue
+    {
+    public:
+        std::size_t operator()(const std::string& s) const noexcept
+        {
+            std::string lower(s);
+            utils::MakeStringLowerCase(lower);
+            return std::hash<std::string>{}(lower);
+        }
+    };
+
+    class EqualValue
+    {
+    public:
+        constexpr bool operator()(const std::string& lhs, const std::string& rhs) const
+        {
+            return utils::StringEqualsIgnoreCase(lhs, rhs);
+        }
+    };
+
+    std::unordered_map<std::string, std::string, HashValue, EqualValue> m_value_lookup;
+    std::vector<std::string> m_keys_by_insertion;
 };