Decompile fn_18182 (ResourceMgr::Exists)

Batch #1614 by eAthena: 0 byte-identical, 1 confirmed by peer review.

- fn_18182 ResourceMgr::Exists: logic confirmed by peer review

Reviewed-by: ragnarok-clanker
Adds to the build: Source/Resource/ResourcePresence.cpp

Source/Contents/Effects/RagEffectInitialization.h

@@ -1,8 +1,9 @@
 #ifndef RAGNAROK_SOURCE_CONTENTS_EFFECTS_RAGEFFECTINITIALIZATION_H
 #define RAGNAROK_SOURCE_CONTENTS_EFFECTS_RAGEFFECTINITIALIZATION_H
 
+#include "Contents/Actors/RenderObjectState.h"
+
 struct RagEffectState;
-struct RenderObjectState;
 struct EffectActor;
 struct ServiceOptions;
 class ResourceMgr;

Source/Resource/ResourceMgr.h

@@ -6,6 +6,7 @@
 
 #include <cstdint>
 #include <map>
+#include <string>
 #include <vector>
 #include <windows.h>
 
@@ -25,6 +26,7 @@ public:
   CRes* Load(std::string name);
   void Remove(CRes* resource);
   bool Exists(const char* name);
+  bool Exists(std::string name);
   void UnloadAll();
   void ClearUnused(const char* extension);
   void ClearUnused();

Source/Resource/ResourcePresence.cpp

@@ -0,0 +1,39 @@
+#include "File/ResourcePath.h"
+#include "Resource/ResourceMgr.h"
+#include "Utility/Text/GroupedInteger.h"
+
+#include <string>
+#include <windows.h>
+#include <timeapi.h>
+
+// OFFSET: 0x00AEF940
+// FUNCTION: fn_18182
+bool ResourceMgr::Exists(std::string name) {
+  const char* text = name.c_str();
+  if (!text) {
+    return false;
+  }
+
+  char normalized[260] = {};
+  strncpy_s(normalized, sizeof(normalized), text, _TRUNCATE);
+
+  for (unsigned char* byte = reinterpret_cast<unsigned char*>(normalized); *byte; ++byte) {
+    if (*byte >= 'A' && *byte <= 'Z') {
+      *byte += 'a' - 'A';
+    }
+  }
+
+  const char* dot = ReverseFindChar(normalized, '.');
+  const int type = this->FindType(dot ? dot + 1 : nullptr);
+  if (type < 0) {
+    return false;
+  }
+
+  const std::string resolved = AddResourcePrefix(normalized, this->m_prefixes[type]);
+  if (CRes* existing = this->Find(type, resolved.c_str())) {
+    existing->lastUse = timeGetTime();
+    return true;
+  }
+
+  return ResourceExists(resolved.c_str(), 0);
+}

data/compile.json

@@ -564,6 +564,7 @@
   "Source/Resource/ResourceAliases.cpp": 3,
   "Source/Resource/ResourceFailures.cpp": 3,
   "Source/Resource/ResourceMgr.cpp": 3,
+  "Source/Resource/ResourcePresence.cpp": 3,
   "Source/Resource/ResourceTransient.cpp": 3,
   "Source/Resource/RmaResource.cpp": 3,
   "Source/Resource/SkinPalette.cpp": 3,