Unify the value returned by linda:deep() and the string conversion of an unnamed Linda

2 files changed, 9 insertions, 2 deletions

diff --git a/src/linda.cpp b/src/linda.cpp
index 81926f9..4dc2162 100644
--- a/src/linda.cpp
+++ b/src/linda.cpp
@@ -87,7 +87,7 @@ template <bool OPT>
             std::ignore = luaG_pushstring(L_, _lindaName);
         } else {
             // obfuscate the pointer so that we can't read the value with our eyes out of a script
-            std::ignore = luaG_pushstring(L_, "%p", std::bit_cast<uintptr_t>(_linda) ^ kConfigRegKey.storage);
+            std::ignore = luaG_pushstring(L_, "%p", _linda->obfuscated());
         }
         lua_concat(L_, 2);
         return 1;
@@ -344,7 +344,7 @@ LUAG_FUNC(linda_count)
 LUAG_FUNC(linda_deep)
 {
     Linda* const _linda{ ToLinda<false>(L_, 1) };
-    lua_pushlightuserdata(L_, _linda); // just the address
+    lua_pushlightuserdata(L_, _linda->obfuscated<void*>()); // just the address
     return 1;
 }
 
diff --git a/src/linda.h b/src/linda.h
index 3098161..6901a86 100644
--- a/src/linda.h
+++ b/src/linda.h
@@ -80,6 +80,13 @@ class Linda
     [[nodiscard]] Keeper* acquireKeeper() const;
     [[nodiscard]] std::string_view getName() const;
     [[nodiscard]] bool inKeeperOperation() const { return keeperOperationCount.load(std::memory_order_seq_cst) != 0; }
+    template <typename T = uintptr_t>
+    [[nodiscard]] T obfuscated() const
+    {
+        // xxh64 of string "kObfuscator" generated at https://www.pelock.com/products/hash-calculator
+        static constexpr UniqueKey kObfuscator{ 0x7B8AA1F99A3BD782ull };
+        return std::bit_cast<T>(std::bit_cast<uintptr_t>(this) ^ kObfuscator.storage);
+    };
     void releaseKeeper(Keeper* keeper_) const;
     [[nodiscard]] static int ProtectedCall(lua_State* L_, lua_CFunction f_);
     [[nodiscard]] KeeperOperationInProgress startKeeperOperation(lua_State* const L_) { return KeeperOperationInProgress{ *this, L_ }; };