feat(Core/DBC): rework load DBC (#3002)

* Move DBC load system from TC
* Add db tables for all dbc
* Support override data from db
* Support override spells from db (#2994)

src/server/shared/DataStores/DBCStore.cpp

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2016+     AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-GPL2
+ * Copyright (C) 2008-2020 TrinityCore <http://www.trinitycore.org/>
+ * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
+ */
+
+#include "DBCStore.h"
+#include "DBCDatabaseLoader.h"
+
+DBCStorageBase::DBCStorageBase(char const* fmt) : _fieldCount(0), _fileFormat(fmt), _dataTable(nullptr), _indexTableSize(0)
+{
+}
+
+DBCStorageBase::~DBCStorageBase()
+{
+    delete[] _dataTable;
+    for (char* strings : _stringPool)
+        delete[] strings;
+}
+
+bool DBCStorageBase::Load(char const* path, char**& indexTable)
+{
+    indexTable = nullptr;
+
+    DBCFileLoader dbc;
+    
+    // Check if load was sucessful, only then continue
+    if (!dbc.Load(path, _fileFormat))
+        return false;
+
+    _fieldCount = dbc.GetCols();
+
+    // load raw non-string data
+    _dataTable = dbc.AutoProduceData(_fileFormat, _indexTableSize, indexTable);
+
+    // load strings from dbc data
+    if (char* stringBlock = dbc.AutoProduceStrings(_fileFormat, _dataTable))
+        _stringPool.push_back(stringBlock);
+
+    // error in dbc file at loading if NULL
+    return indexTable != nullptr;
+}
+
+bool DBCStorageBase::LoadStringsFrom(char const* path, char** indexTable)
+{
+    // DBC must be already loaded using Load
+    if (!indexTable)
+        return false;
+
+    DBCFileLoader dbc;
+    
+    // Check if load was successful, only then continue
+    if (!dbc.Load(path, _fileFormat))
+        return false;
+
+    // load strings from another locale dbc data
+    if (char* stringBlock = dbc.AutoProduceStrings(_fileFormat, _dataTable))
+        _stringPool.push_back(stringBlock);
+
+    return true;
+}
+
+void DBCStorageBase::LoadFromDB(char const* table, char const* format, char**& indexTable)
+{
+    _stringPool.push_back(DBCDatabaseLoader(table, format, _stringPool).Load(_indexTableSize, indexTable));
+}