protoio.hh

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/*
 * Copyright (c) 2012 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#ifndef __PROTO_PROTOIO_HH__
#define __PROTO_PROTOIO_HH__

#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/io/gzip_stream.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>
#include <google/protobuf/message.h>

#include <fstream>

class ProtoStream
{

  protected:

    static const uint32_t magicNumber = 0x356d6567;

    ProtoStream() {}

  private:

    ProtoStream(const ProtoStream&);
    ProtoStream& operator=(const ProtoStream&);
};

class ProtoOutputStream : public ProtoStream
{

  public:

    ProtoOutputStream(const std::string& filename);

    ~ProtoOutputStream();

    void write(const google::protobuf::Message& msg);

  private:

    std::ofstream fileStream;

    google::protobuf::io::OstreamOutputStream* wrappedFileStream;

    google::protobuf::io::GzipOutputStream* gzipStream;

    google::protobuf::io::ZeroCopyOutputStream* zeroCopyStream;

};

class ProtoInputStream : public ProtoStream
{

  public:

    ProtoInputStream(const std::string& filename);

    ~ProtoInputStream();

    bool read(google::protobuf::Message& msg);

    void reset();

  private:

    void createStreams();

    void destroyStreams();

    std::ifstream fileStream;

    const std::string fileName;

    bool useGzip;

    google::protobuf::io::IstreamInputStream* wrappedFileStream;

    google::protobuf::io::GzipInputStream* gzipStream;

    google::protobuf::io::ZeroCopyInputStream* zeroCopyStream;

};

#endif //__PROTO_PROTOIO_HH