0032099: Visualization - define OSD_FileSystem class managing opening of file streams

[occt.git] / src / OSD / OSD_StreamBuffer.hxx

diff --git a/src/OSD/OSD_StreamBuffer.hxx b/src/OSD/OSD_StreamBuffer.hxx
new file mode 100644 (file)
index 0000000..59836e6
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+++ b/src/OSD/OSD_StreamBuffer.hxx
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+// Copyright (c) 2021 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef _OSD_StreamBuffer_HeaderFile
+#define _OSD_StreamBuffer_HeaderFile
+
+#include <Standard_Std.hxx>
+
+#include <fstream>
+#include <iostream>
+#include <memory>
+#include <string>
+
+//! A file stream implementation initialized from std::shared_ptr<std::streambuf>.
+template <typename T>
+class OSD_StreamBuffer : public T
+{
+public:
+
+  //! Main constructor.
+  OSD_StreamBuffer (const std::string& theUrl,
+                    const opencascade::std::shared_ptr<std::streambuf>& theBuffer)
+  : T (theBuffer.get()), myUrl (theUrl), myBuffer (theBuffer) {}
+
+  //! Return an opened URL.
+  const std::string& Url() const { return myUrl; }
+
+protected:
+
+  std::string                                  myUrl;
+  opencascade::std::shared_ptr<std::streambuf> myBuffer;
+};
+
+typedef OSD_StreamBuffer<std::istream>  OSD_IStreamBuffer;
+typedef OSD_StreamBuffer<std::ostream>  OSD_OStreamBuffer;
+typedef OSD_StreamBuffer<std::iostream> OSD_IOStreamBuffer;
+
+#endif // _OSD_StreamBuffer_HeaderFile