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
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * 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