Initial rodecomp source snapshot

Source/File/ResourcePath.h

@@ -0,0 +1,17 @@
+#ifndef RAGNAROK_SOURCE_FILE_RESOURCEPATH_H
+#define RAGNAROK_SOURCE_FILE_RESOURCEPATH_H
+
+#include <cstdint>
+#include <string>
+
+// Reconstructed names for the original resource path and existence helpers.
+std::string MakeResourcePath(std::string filename);
+bool ResourceExists(const char* filename, int looseOnly);
+
+// Full loose-file reader used after archive lookup. size must be non-null.
+// Publishes the low file-size DWORD after opening, even when allocation fails;
+// a successful allocation is returned regardless of ReadFile's status/count.
+// Caller owns the returned region and releases it with VirtualFree/MEM_RELEASE.
+void* ReadLooseResource(const char* filename, std::uint32_t* size);
+
+#endif