IStreamInputSource.h

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/****************************************************************************/
// Eclipse SUMO, Simulation of Urban MObility; see https://eclipse.dev/sumo
// Copyright (C) 2002-2024 German Aerospace Center (DLR) and others.
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0/
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License 2.0 are satisfied: GNU General Public License, version 2
// or later which is available at
// https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
/****************************************************************************/
// Xerces InputSource reading from arbitrary std::istream
// reimplementation inspired by https://marc.info/?l=xerces-dev&m=86952133511623
/****************************************************************************/
#pragma once
#include <config.h>
#include <iostream>
#include <xercesc/util/BinInputStream.hpp>
#include <xercesc/sax/InputSource.hpp>
 
 
// ===========================================================================
// class definitions
// ===========================================================================
class IStreamBinInputStream : public XERCES_CPP_NAMESPACE::BinInputStream {
public:
    IStreamBinInputStream(std::istream& in) : myIn(in) { }
    virtual ~IStreamBinInputStream(void) { }
    virtual XMLFilePos curPos(void) const {
        return myIn.tellg();
    }
    virtual XMLSize_t readBytes(XMLByte* const buf, const XMLSize_t max) {
        myIn.read((char*)buf, max);
        return (XMLSize_t)myIn.gcount();
    }
    virtual const XMLCh* getContentType() const {
        return nullptr;
    }
private:
    std::istream& myIn;
};
 
 
class IStreamInputSource : public XERCES_CPP_NAMESPACE::InputSource {
public:
    IStreamInputSource(std::istream& in) :
        XERCES_CPP_NAMESPACE::InputSource("istream"), myIn(in) { }
    virtual ~IStreamInputSource(void) { }
    virtual XERCES_CPP_NAMESPACE::BinInputStream* makeStream(void) const {
        return new IStreamBinInputStream(myIn);
    }
private:
    std::istream& myIn;
};