C++ (Cpp) VSIMemFilesystemHandler::Open Examples

Example #1

File: cpl_vsi_mem.cpp Project: ksshannon/gdal

VSILFILE *VSIFileFromMemBuffer( const char *pszFilename,
                                GByte *pabyData,
                                vsi_l_offset nDataLength,
                                int bTakeOwnership )

{
    if( VSIFileManager::GetHandler("")
        == VSIFileManager::GetHandler("/vsimem/") )
        VSIInstallMemFileHandler();

    VSIMemFilesystemHandler *poHandler =
        static_cast<VSIMemFilesystemHandler *>(
                VSIFileManager::GetHandler("/vsimem/"));

    if( pszFilename == nullptr )
        return nullptr;

    CPLString osFilename = pszFilename;
    VSIMemFilesystemHandler::NormalizePath( osFilename );
    if( osFilename.empty() )
        return nullptr;

    VSIMemFile *poFile = new VSIMemFile;

    poFile->osFilename = osFilename;
    poFile->bOwnData = CPL_TO_BOOL(bTakeOwnership);
    poFile->pabyData = pabyData;
    poFile->nLength = nDataLength;
    poFile->nAllocLength = nDataLength;

    {
        CPLMutexHolder oHolder( &poHandler->hMutex );
        poHandler->Unlink_unlocked(osFilename);
        poHandler->oFileList[poFile->osFilename] = poFile;
        CPLAtomicInc(&(poFile->nRefCount));
    }

    // TODO(schwehr): Fix this so that the using statement is not needed.
    // Will just adding the bool for bSetError be okay?
    return reinterpret_cast<VSILFILE *>( poHandler->Open( osFilename, "r+" ) );
}

Example #2

VSILFILE *VSIFileFromMemBuffer( const char *pszFilename,
                          GByte *pabyData, 
                          vsi_l_offset nDataLength,
                          int bTakeOwnership )

{
    if( VSIFileManager::GetHandler("") 
        == VSIFileManager::GetHandler("/vsimem/") )
        VSIInstallMemFileHandler();

    VSIMemFilesystemHandler *poHandler = (VSIMemFilesystemHandler *) 
        VSIFileManager::GetHandler("/vsimem/");

    if (pszFilename == NULL)
        return NULL;

    CPLString osFilename = pszFilename;
    VSIMemFilesystemHandler::NormalizePath( osFilename );

    VSIMemFile *poFile = new VSIMemFile;

    poFile->osFilename = osFilename;
    poFile->bOwnData = bTakeOwnership;
    poFile->pabyData = pabyData;
    poFile->nLength = nDataLength;
    poFile->nAllocLength = nDataLength;

    {
        CPLMutexHolder oHolder( &poHandler->hMutex );
        poHandler->Unlink(osFilename);
        poHandler->oFileList[poFile->osFilename] = poFile;
        poFile->nRefCount++;
    }

    return (VSILFILE *) poHandler->Open( osFilename, "r+" );
}