1 files changed, 132 insertions, 0 deletions
diff --git a/NorthstarDLL/keyvalues.cpp b/NorthstarDLL/keyvalues.cpp
new file mode 100644
index 00000000..98a9ce66
--- /dev/null
+++ b/NorthstarDLL/keyvalues.cpp
@@ -0,0 +1,132 @@
+#include "pch.h"
+#include "modmanager.h"
+#include "filesystem.h"
+
+#include <fstream>
+
+AUTOHOOK_INIT()
+
+void ModManager::TryBuildKeyValues(const char* filename)
+{
+	spdlog::info("Building KeyValues for file {}", filename);
+
+	std::string normalisedPath = g_pModManager->NormaliseModFilePath(fs::path(filename));
+	fs::path compiledPath = GetCompiledAssetsPath() / filename;
+	fs::path compiledDir = compiledPath.parent_path();
+	fs::create_directories(compiledDir);
+
+	fs::path kvPath(filename);
+	std::string ogFilePath = "mod_original_";
+	ogFilePath += kvPath.filename().string();
+
+	std::string newKvs = "// AUTOGENERATED: MOD PATCH KV\n";
+
+	int patchNum = 0;
+
+	// copy over patch kv files, and add #bases to new file, last mods' patches should be applied first
+	// note: #include should be identical but it's actually just broken, thanks respawn
+	for (int64_t i = m_LoadedMods.size() - 1; i > -1; i--)
+	{
+		if (!m_LoadedMods[i].m_bEnabled)
+			continue;
+
+		size_t fileHash = STR_HASH(normalisedPath);
+		auto modKv = m_LoadedMods[i].KeyValues.find(fileHash);
+		if (modKv != m_LoadedMods[i].KeyValues.end())
+		{
+			// should result in smth along the lines of #include "mod_patch_5_mp_weapon_car.txt"
+
+			std::string patchFilePath = "mod_patch_";
+			patchFilePath += std::to_string(patchNum++);
+			patchFilePath += "_";
+			patchFilePath += kvPath.filename().string();
+
+			newKvs += "#base \"";
+			newKvs += patchFilePath;
+			newKvs += "\"\n";
+
+			fs::remove(compiledDir / patchFilePath);
+
+			fs::copy_file(m_LoadedMods[i].m_ModDirectory / "keyvalues" / filename, compiledDir / patchFilePath);
+		}
+	}
+
+	// add original #base last, #bases don't override preexisting keys, including the ones we've just done
+	newKvs += "#base \"";
+	newKvs += ogFilePath;
+	newKvs += "\"\n";
+
+	// load original file, so we can parse out the name of the root obj (e.g. WeaponData for weapons)
+	std::string originalFile = R2::ReadVPKOriginalFile(filename);
+
+	if (!originalFile.length())
+	{
+		spdlog::warn("Tried to patch kv {} but no base kv was found!", ogFilePath);
+		return;
+	}
+
+	char rootName[64];
+	memset(rootName, 0, sizeof(rootName));
+
+	// iterate until we hit an ascii char that isn't in a # command or comment to get root obj name
+	int i = 0;
+	while (!(originalFile[i] >= 65 && originalFile[i] <= 122))
+	{
+		// if we hit a comment or # thing, iterate until end of line
+		if (originalFile[i] == '/' || originalFile[i] == '#')
+			while (originalFile[i] != '\n')
+				i++;
+
+		i++;
+	}
+
+	int j = 0;
+	for (int j = 0; originalFile[i] >= 65 && originalFile[i] <= 122; j++)
+		rootName[j] = originalFile[i++];
+
+	// empty kv, all the other stuff gets #base'd
+	newKvs += rootName;
+	newKvs += "\n{\n}\n";
+
+	std::ofstream originalFileWriteStream(compiledDir / ogFilePath, std::ios::binary);
+	originalFileWriteStream << originalFile;
+	originalFileWriteStream.close();
+
+	std::ofstream writeStream(compiledPath, std::ios::binary);
+	writeStream << newKvs;
+	writeStream.close();
+
+	ModOverrideFile overrideFile;
+	overrideFile.m_pOwningMod = nullptr;
+	overrideFile.m_Path = normalisedPath;
+
+	if (m_ModFiles.find(normalisedPath) == m_ModFiles.end())
+		m_ModFiles.insert(std::make_pair(normalisedPath, overrideFile));
+	else
+		m_ModFiles[normalisedPath] = overrideFile;
+}
+
+// clang-format off
+AUTOHOOK(KeyValues__LoadFromBuffer, engine.dll + 0x426C30,
+char, __fastcall, (void* self, const char* resourceName, const char* pBuffer, void* pFileSystem, void* a5, void* a6, int a7))
+// clang-format on
+{
+	static void* pSavedFilesystemPtr = nullptr;
+
+	// this is just to allow playlists to get a valid pFileSystem ptr for kv building, other functions that call this particular overload of
+	// LoadFromBuffer seem to get called on network stuff exclusively not exactly sure what the address wanted here is, so just taking it
+	// from a function call that always happens before playlists is loaded
+
+	// note: would be better if we could serialize this to disk for playlists, as this method breaks saving playlists in demos
+	if (pFileSystem != nullptr)
+		pSavedFilesystemPtr = pFileSystem;
+	if (!pFileSystem && !strcmp(resourceName, "playlists"))
+		pFileSystem = pSavedFilesystemPtr;
+
+	return KeyValues__LoadFromBuffer(self, resourceName, pBuffer, pFileSystem, a5, a6, a7);
+}
+
+ON_DLL_LOAD("engine.dll", KeyValues, (CModule module))
+{
+	AUTOHOOK_DISPATCH()
+}