wxstream_helper.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2020 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef WXSTREAM_HELPER_H
#define WXSTREAM_HELPER_H
 
#include <vector>
#include <wx/log.h>
#include <wx/wfstream.h>
 
 
static bool CopyStreamData( wxInputStream& inputStream, wxOutputStream& outputStream,
 wxFileOffset size )
{
 constexpr size_t bufSize = 128 * 1024;
 std::vector<wxChar> buf( bufSize );
 
 wxFileOffset copiedData = 0;
 wxFileOffset readSize = bufSize;
 
 for( ; ; )
 {
 if(size != -1 && copiedData + readSize > size )
 readSize = size - copiedData;
 
 inputStream.Read( buf.data(), readSize );
 
 size_t actuallyRead = inputStream.LastRead();
 outputStream.Write( buf.data(), actuallyRead );
 
 if( outputStream.LastWrite() != actuallyRead )
 {
 wxLogError( _("Failed to output data") );
 //return false;
 }
 
 if( size == -1 )
 {
 if( inputStream.Eof() )
 break;
 }
 else
 {
 copiedData += actuallyRead;
 
 if( copiedData >= size )
 break;
 }
 }
 
 return true;
}
 
 
#endif // WXSTREAM_HELPER_H