add reading of entrance objects

src/object/ObjectFactory.cpp

@@ -0,0 +1,71 @@
+#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
+/*****************************************************************************
+ * OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
+ *
+ * OpenRCT2 is the work of many authors, a full list can be found in contributors.md
+ * For more information, visit https://github.com/OpenRCT2/OpenRCT2
+ *
+ * OpenRCT2 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * A full copy of the GNU General Public License can be found in licence.txt
+ *****************************************************************************/
+#pragma endregion
+
+#include "../core/FileStream.hpp"
+#include "../core/Memory.hpp"
+#include "../core/MemoryStream.h"
+#include "EntranceObject.h"
+#include "Object.h"
+#include "ObjectFactory.h"
+
+extern "C"
+{
+    #include "../object.h"
+    #include "../util/sawyercoding.h"
+}
+
+namespace ObjectFactory
+{
+    Object * CreateObjectFromLegacyFile(utf8 * path)
+    {
+        Object * result = nullptr;
+
+        SDL_RWops * file = SDL_RWFromFile(path, "rb");
+        if (file != nullptr)
+        {
+            rct_object_entry entry;
+            if (SDL_RWread(file, &entry, sizeof(entry), 1) == 1)
+            {
+                uint8 objectType = entry.flags & 0x0F;
+                result = CreateObject(objectType);
+                if (result != nullptr)
+                {
+                    size_t bufferSize = 0x600000;
+                    void * buffer = Memory::Allocate<void>(bufferSize);
+                    bufferSize = sawyercoding_read_chunk_with_size(file, (uint8 *)buffer, bufferSize);
+                    buffer = Memory::Reallocate(buffer, bufferSize);
+                    auto ms = MemoryStream(buffer, bufferSize);
+                    result->ReadLegacy(&ms);
+                }
+            }
+            SDL_RWclose(file);
+        }
+        return result;
+    }
+
+    Object * CreateObject(uint8 type)
+    {
+        Object * result = nullptr;
+
+        switch (type) {
+        case OBJECT_TYPE_PARK_ENTRANCE:
+            result = new EntranceObject();
+            break;
+        }
+
+        return result;
+    }
+}