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

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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.
This commit is contained in:
osa
2021-02-05 17:51:17 +03:00
committed by bugmaster
parent 9ee2481598
commit 92f8ec2f01
23 changed files with 712 additions and 41 deletions
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76
src/OSD/OSD_LocalFileSystem.cxx Normal file
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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.
#include <OSD_LocalFileSystem.hxx>
#include <OSD_OpenFile.hxx>
#include <OSD_Path.hxx>
#include <Standard_Assert.hxx>
IMPLEMENT_STANDARD_RTTIEXT(OSD_LocalFileSystem, OSD_FileSystem)
//=======================================================================
// function : IsSupportedPath
// purpose :
//=======================================================================
Standard_Boolean OSD_LocalFileSystem::IsSupportedPath (const TCollection_AsciiString& theUrl) const
{
return !OSD_Path::IsRemoteProtocolPath (theUrl.ToCString());
}
//=======================================================================
// function : IsOpenIStream
// purpose :
//=======================================================================
Standard_Boolean OSD_LocalFileSystem::IsOpenIStream (const opencascade::std::shared_ptr<std::istream>& theStream) const
{
opencascade::std::shared_ptr<OSD_IStreamBuffer> aFileStream = opencascade::std::dynamic_pointer_cast<OSD_IStreamBuffer> (theStream);
if (aFileStream.get() == NULL)
{
return false;
}
const std::filebuf* aFileBuf = dynamic_cast<const std::filebuf*> (aFileStream->rdbuf());
return (aFileBuf != NULL) ? aFileBuf->is_open() : false;
}
//=======================================================================
// function : OpenStreamBuffer
// purpose :
//=======================================================================
opencascade::std::shared_ptr<std::streambuf> OSD_LocalFileSystem::OpenStreamBuffer (const TCollection_AsciiString& theUrl,
const std::ios_base::openmode theMode,
const int64_t theOffset,
int64_t* theOutBufSize)
{
Standard_ASSERT_RAISE (theOffset >= 0, "Incorrect negative stream position during stream buffer opening");
opencascade::std::shared_ptr<std::filebuf> aNewBuf(new std::filebuf());
if (!OSD_OpenStream (*aNewBuf, TCollection_ExtendedString(theUrl), theMode))
{
return opencascade::std::shared_ptr<std::streambuf>();
}
// if buffer is opened for read, find the file size
if (theOutBufSize && ((theMode & std::ios::in) != 0))
{
*theOutBufSize = (int64_t )aNewBuf->pubseekoff (0, std::ios_base::end, std::ios_base::in);
if (aNewBuf->pubseekoff ((std::streamoff )theOffset, std::ios_base::beg, std::ios_base::in) < 0)
{
*theOutBufSize = 0;
return opencascade::std::shared_ptr<std::streambuf>();
}
}
else if (theOffset > 0 && aNewBuf->pubseekoff ((std::streamoff )theOffset, std::ios_base::beg,
(theMode & std::ios::in) != 0 ? std::ios_base::in : std::ios_base::out) < 0)
{
return opencascade::std::shared_ptr<std::streambuf>();
}
return aNewBuf;
}