From 1036b7368e5625d34666beb24163756c1da6b227 Mon Sep 17 00:00:00 2001
From: Marvelco <helito941@gmail.com>
Date: Wed, 11 Mar 2026 05:04:19 +0200
Subject: Fixed DLC map loading / saving, missing chunks (#1114)

* fixed all DLC maps

* fixed old saves have overlapping chunks with the new system
---
 .../Common/GameRules/LevelGenerationOptions.cpp    | 69 ++++++++++++++++++++++
 .../Common/Network/GameNetworkManager.cpp          |  7 ++-
 2 files changed, 75 insertions(+), 1 deletion(-)

(limited to 'Minecraft.Client/Common')

diff --git a/Minecraft.Client/Common/GameRules/LevelGenerationOptions.cpp b/Minecraft.Client/Common/GameRules/LevelGenerationOptions.cpp
index 2f121f4f..2af1826c 100644
--- a/Minecraft.Client/Common/GameRules/LevelGenerationOptions.cpp
+++ b/Minecraft.Client/Common/GameRules/LevelGenerationOptions.cpp
@@ -455,6 +455,74 @@ unordered_map<wstring, ConsoleSchematicFile *> *LevelGenerationOptions::getUnfin
 
 void LevelGenerationOptions::loadBaseSaveData()
 {
+#ifdef _WINDOWS64
+	
+	int gameRulesCount = m_parentDLCPack ? m_parentDLCPack->getDLCItemsCount(DLCManager::e_DLCType_GameRulesHeader) : 0;
+
+	wstring baseSave = getBaseSavePath();
+	wstring packName = baseSave.substr(0, baseSave.find(L'.'));
+
+	for (int i = 0; i < gameRulesCount; ++i)
+	{
+		DLCGameRulesHeader* dlcFile = static_cast<DLCGameRulesHeader*>(m_parentDLCPack->getFile(DLCManager::e_DLCType_GameRulesHeader, i));
+
+		if (!dlcFile->getGrfPath().empty())
+		{
+			File grf(L"Windows64Media\\DLC\\" + packName + L"\\Data\\" + dlcFile->getGrfPath());
+
+			if (grf.exists())
+			{
+				wstring path = grf.getPath();
+				HANDLE fileHandle = CreateFileW(path.c_str(), GENERIC_READ, 0, nullptr, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, nullptr);
+
+				if (fileHandle != INVALID_HANDLE_VALUE)
+				{
+					DWORD dwFileSize = grf.length();
+					DWORD bytesRead;
+					PBYTE pbData = new BYTE[dwFileSize];
+					BOOL bSuccess = ReadFile(fileHandle, pbData, dwFileSize, &bytesRead, nullptr);
+					CloseHandle(fileHandle);
+
+					if (bSuccess)
+					{
+						dlcFile->setGrfData(pbData, dwFileSize, m_stringTable);
+						app.m_gameRules.setLevelGenerationOptions(dlcFile->lgo);
+					}
+					delete[] pbData;
+				}
+			}
+		}
+	}
+
+	if (requiresBaseSave() && !getBaseSavePath().empty())
+	{
+		File save(L"Windows64Media\\DLC\\" + packName + L"\\Data\\" + baseSave);
+
+		if (save.exists())
+		{
+			wstring path = save.getPath();
+			HANDLE fileHandle = CreateFileW(path.c_str(), GENERIC_READ, 0, nullptr, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, nullptr);
+
+			if (fileHandle != INVALID_HANDLE_VALUE)
+			{
+				DWORD dwFileSize = GetFileSize(fileHandle, nullptr);
+				DWORD bytesRead;
+				PBYTE pbData = new BYTE[dwFileSize];
+				BOOL bSuccess = ReadFile(fileHandle, pbData, dwFileSize, &bytesRead, nullptr);
+				CloseHandle(fileHandle);
+
+				if (bSuccess)
+					setBaseSaveData(pbData, dwFileSize);
+				else
+					delete[] pbData;
+			}
+		}
+	}
+
+	setLoadedData();
+	app.SetAction(ProfileManager.GetPrimaryPad(), eAppAction_ReloadTexturePack);
+
+#else
 	int mountIndex = -1;
 	if(m_parentDLCPack != nullptr) mountIndex = m_parentDLCPack->GetDLCMountIndex();
 
@@ -481,6 +549,7 @@ void LevelGenerationOptions::loadBaseSaveData()
 		setLoadedData();
 		app.SetAction(ProfileManager.GetPrimaryPad(), eAppAction_ReloadTexturePack);
 	}
+#endif
 }
 
 int LevelGenerationOptions::packMounted(LPVOID pParam,int iPad,DWORD dwErr,DWORD dwLicenceMask)
diff --git a/Minecraft.Client/Common/Network/GameNetworkManager.cpp b/Minecraft.Client/Common/Network/GameNetworkManager.cpp
index 3c032bf9..a502dbfb 100644
--- a/Minecraft.Client/Common/Network/GameNetworkManager.cpp
+++ b/Minecraft.Client/Common/Network/GameNetworkManager.cpp
@@ -942,13 +942,18 @@ int CGameNetworkManager::ServerThreadProc( void* lpParameter )
 		app.SetGameHostOption(eGameHostOption_All,param->settings);
 
 		// 4J Stu - If we are loading a DLC save that's separate from the texture pack, load
-		if( param->levelGen != nullptr && (param->texturePackId == 0 || param->levelGen->getRequiredTexturePackId() != param->texturePackId) )
+		if (param != nullptr && param->levelGen != nullptr && param->levelGen->isFromDLC())
 		{
 			while((Minecraft::GetInstance()->skins->needsUIUpdate() || ui.IsReloadingSkin()))
 			{
 				Sleep(1);
 			}
 			param->levelGen->loadBaseSaveData();
+
+			while (!param->levelGen->hasLoadedData())
+			{
+				Sleep(1);
+			}
 		}
 	}
 
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