Method Validate

src/engine/shared/datafile.cpp:326–439

	}

	bool Validate() const
	{
#define Check(Test, ErrorMessage, ...) \
	do \
	{ \
		if(!(Test)) \
		{ \
			log_error("datafile", "invalid file information: " ErrorMessage, ##__VA_ARGS__); \
			return false; \
		} \
	} while(false)

		// validate item types
		int64_t CountedItems = 0;
		std::unordered_set<int> UsedItemTypes;
		for(int Index = 0; Index < m_Header.m_NumItemTypes; Index++)
		{
			const CDatafileItemType &ItemType = m_Info.m_pItemTypes[Index];
			Check(ItemType.m_Type >= 0 && ItemType.m_Type <= MAX_ITEM_TYPE, "item type has invalid type. index=%d type=%d", Index, ItemType.m_Type);
			const auto [_, Inserted] = UsedItemTypes.insert(ItemType.m_Type);
			Check(Inserted, "item type has duplicate type. index=%d type=%d", Index, ItemType.m_Type);
			Check(ItemType.m_Num > 0, "item type has invalid number of items. index=%d type=%d num=%d", Index, ItemType.m_Type, ItemType.m_Num);
			Check(ItemType.m_Start == CountedItems, "item type has invalid start. index=%d type=%d start=%d", Index, ItemType.m_Type, ItemType.m_Start);
			CountedItems += ItemType.m_Num;
			if(CountedItems > m_Header.m_NumItems)
			{
				break;
			}
		}
		Check(CountedItems == m_Header.m_NumItems, "mismatched number of items in item types. counted=%" PRId64 " header=%d", CountedItems, m_Header.m_NumItems);

		// validate item offsets
		int PrevItemOffset = -1;
		for(int Index = 0; Index < m_Header.m_NumItems; Index++)
		{
			const int Offset = m_Info.m_pItemOffsets[Index];
			if(Index == 0)
			{
				Check(Offset == 0, "first item offset is not zero. offset=%d", Offset);
			}
			else
			{
				Check(Offset > PrevItemOffset, "item offset not greater than previous. index=%d offset=%d previous=%d", Index, Offset, PrevItemOffset);
			}
			Check(Offset < m_Header.m_ItemSize, "item offset larger than total item size. index=%d offset=%d total=%d", Index, Offset, m_Header.m_ItemSize);
			PrevItemOffset = Offset;
		}

		// validate item sizes, types and IDs
		int64_t TotalItemSize = 0;
		for(int TypeIndex = 0; TypeIndex < m_Header.m_NumItemTypes; TypeIndex++)
		{
			std::unordered_set<int> UsedItemIds;
			const CDatafileItemType &ItemType = m_Info.m_pItemTypes[TypeIndex];
			for(int ItemIndex = ItemType.m_Start; ItemIndex < ItemType.m_Start + ItemType.m_Num; ItemIndex++)
			{
				const int FileItemSize = GetFileItemSize(ItemIndex);
				Check(FileItemSize >= (int)sizeof(CDatafileItem), "map item too small for header. type_index=%d item_index=%d size=%d header=%d", TypeIndex, ItemIndex, FileItemSize, (int)sizeof(CDatafileItem));