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92f8ec2f01
1) Remove unnecessary includes of "Standard_OStream.hxx" file and add it only into files where it is really used. 2) Create the base interface for a file stream provider OSD_FileSystem and its inheritor OSD_CachedFileSystem that keeping last stream to be reused for opening a stream with the same URL. 3) Use OSD_CachedFileSystem object instead of RWGltf_GltfSharedIStream during Gltf reading.
74 lines
3.1 KiB
C++
74 lines
3.1 KiB
C++
// Copyright (c) 2021 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _OSD_CachedFileSystem_HeaderFile
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#define _OSD_CachedFileSystem_HeaderFile
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#include <OSD_FileSystem.hxx>
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//! File system keeping last stream created by OSD_FileSystem::DefaultFileSystem() to be reused for opening a stream with the same URL.
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//! Note that as file is kept in opened state, application will need destroying this object to ensure all files being closed.
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//! This interface could be handy in context of reading numerous objects pointing to the same file (at different offset).
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//! Make sure to create a dedicated OSD_CachedFileSystem for each working thread to avoid data races.
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class OSD_CachedFileSystem : public OSD_FileSystem
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{
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DEFINE_STANDARD_RTTIEXT(OSD_CachedFileSystem, OSD_FileSystem)
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public:
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//! Constructor.
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OSD_CachedFileSystem() {}
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//! Returns TRUE if URL defines a supported protocol.
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Standard_EXPORT virtual Standard_Boolean IsSupportedPath (const TCollection_AsciiString& theUrl) const Standard_OVERRIDE;
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//! Returns TRUE if current input stream is opened for reading operations.
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Standard_EXPORT virtual Standard_Boolean IsOpenIStream (const opencascade::std::shared_ptr<std::istream>& theStream) const Standard_OVERRIDE;
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//! Opens stream for specified file URL for reading operations or returns previously created stream pointing to the same URL.
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Standard_EXPORT virtual opencascade::std::shared_ptr<std::istream> OpenIStream
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(const TCollection_AsciiString& theUrl,
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const std::ios_base::openmode theParams,
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const int64_t theOffset,
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const opencascade::std::shared_ptr<std::istream>& theOldStream) Standard_OVERRIDE;
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//! Opens stream buffer for specified file URL.
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Standard_EXPORT virtual opencascade::std::shared_ptr<std::streambuf> OpenStreamBuffer
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(const TCollection_AsciiString& theUrl,
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const std::ios_base::openmode theMode,
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const int64_t theOffset = 0,
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int64_t* theOutBufSize = NULL) Standard_OVERRIDE;
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protected:
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// Auxiliary structure to save shared stream with path to it.
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struct OSD_CachedStream
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{
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TCollection_AsciiString Url;
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opencascade::std::shared_ptr<std::istream> Stream;
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opencascade::std::shared_ptr<std::streambuf> StreamBuf;
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void Reset()
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{
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Stream.reset();
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StreamBuf.reset();
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}
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};
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protected:
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OSD_CachedStream myStream;
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};
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#endif // _OSD_CachedFileSystem_HeaderFile
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