Merge remote-tracking branch 'origin/feature/lib_cfcpp3' into develop

fix

Common/cfcpp/Stream/stream_utils.cpp

@@ -0,0 +1,58 @@
+/*
+* (c) Copyright Ascensio System SIA 2010-2019
+*
+* This program is a free software product. You can redistribute it and/or
+* modify it under the terms of the GNU Affero General Public License (AGPL)
+* version 3 as published by the Free Software Foundation. In accordance with
+* Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
+* that Ascensio System SIA expressly excludes the warranty of non-infringement
+* of any third-party rights.
+*
+* This program is distributed WITHOUT ANY WARRANTY; without even the implied
+* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For
+* details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
+*
+* You can contact Ascensio System SIA at 20A-12 Ernesta Birznieka-Upisha
+* street, Riga, Latvia, EU, LV-1050.
+*
+* The  interactive user interfaces in modified source and object code versions
+* of the Program must display Appropriate Legal Notices, as required under
+* Section 5 of the GNU AGPL version 3.
+*
+* Pursuant to Section 7(b) of the License you must retain the original Product
+* logo when distributing the program. Pursuant to Section 7(e) we decline to
+* grant you any rights under trademark law for use of our trademarks.
+*
+* All the Product's GUI elements, including illustrations and icon sets, as
+* well as technical writing content are licensed under the terms of the
+* Creative Commons Attribution-ShareAlike 4.0 International. See the License
+* terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
+*
+*/
+#include "stream_utils.h"
+#include "fstream_wrapper.h"
+
+
+using namespace CFCPP;
+
+
+_INT64 CFCPP::Length(const CFCPP::Stream& st)
+{
+    if (st.get() == nullptr)
+        return 0;
+
+    auto curPos = st->tell();
+    st->seek(0, std::ios_base::end);
+    auto ssize = st->tell();
+    st->seek(curPos);
+
+    return ssize;
+}
+
+bool CFCPP::IsOpen(const Stream &st)
+{
+    if (std::dynamic_pointer_cast<FStreamWrapper>(st))
+        return std::static_pointer_cast<FStreamWrapper>(st)->is_open();
+
+    return false;
+}