Core/DataStores: Refactor DB2 loaders to be reusable by extractors

src/tools/extractor_common/DB2CascFileSource.cpp

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2008-2017 TrinityCore <http://www.trinitycore.org/>
+ *
+ * This program 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 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "DB2CascFileSource.h"
+#include <CascLib.h>
+
+DB2CascFileSource::DB2CascFileSource(CASC::StorageHandle const& storage, std::string fileName)
+{
+    _fileHandle = CASC::OpenFile(storage, fileName.c_str(), CASC_LOCALE_NONE, true);
+    _fileName = std::move(fileName);
+}
+
+bool DB2CascFileSource::IsOpen() const
+{
+    return _fileHandle != nullptr;
+}
+
+bool DB2CascFileSource::Read(void* buffer, std::size_t numBytes)
+{
+    DWORD bytesRead = 0;
+    return CASC::ReadFile(_fileHandle, buffer, numBytes, &bytesRead) && numBytes == bytesRead;
+}
+
+std::size_t DB2CascFileSource::GetPosition() const
+{
+    return CASC::GetFilePointer(_fileHandle);
+}
+
+char const* DB2CascFileSource::GetFileName() const
+{
+    return _fileName.c_str();
+}