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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.
*
* Authors: Andreas Hansson
*/
/**
* @file
* Declaration of a wrapper for protobuf output streams and input streams.
*/
#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>
/**
* A ProtoStream provides the shared functionality of the input and
* output streams. At the moment this is limited to magic number.
*/
class ProtoStream
{
protected:
/// Use the ASCII characters gem5 as our magic number
static const uint32_t magicNumber = 0x356d6567;
/**
* Create a ProtoStream.
*/
ProtoStream() {}
private:
/**
* Hide the copy constructor and assignment operator.
* @{
*/
ProtoStream(const ProtoStream&);
ProtoStream& operator=(const ProtoStream&);
/** @} */
};
/**
* A ProtoOutputStream wraps a coded stream, potentially with
* compression, based on looking at the file name. Writing to the
* stream is done to enable interaction with the file on a per-message
* basis to avoid having to deal with huge data structures. The latter
* is made possible by encoding the length of each message in the
* stream.
*/
class ProtoOutputStream : public ProtoStream
{
public:
/**
* Create an output stream for a given file name. If the filename
* ends with .gz then the file will be compressed accordinly.
*
* @param filename Path to the file to create or truncate
*/
ProtoOutputStream(const std::string& filename);
/**
* Destruct the output stream, and also flush and close the
* underlying file streams and coded streams.
*/
~ProtoOutputStream();
/**
* Write a message to the stream, preprending it with the message
* size.
*
* @param msg Message to write to the stream
*/
void write(const google::protobuf::Message& msg);
private:
/// Underlying file output stream
std::ofstream fileStream;
/// Zero Copy stream wrapping the STL output stream
google::protobuf::io::OstreamOutputStream* wrappedFileStream;
/// Optional Gzip stream to wrap the Zero Copy stream
google::protobuf::io::GzipOutputStream* gzipStream;
/// Top-level zero-copy stream, either with compression or not
google::protobuf::io::ZeroCopyOutputStream* zeroCopyStream;
};
/**
* A ProtoInputStream wraps a coded stream, potentially with
* decompression, based on looking at the file name. Reading from the
* stream is done on a per-message basis to avoid having to deal with
* huge data structures. The latter assumes the length of each message
* is encoded in the stream when it is written.
*/
class ProtoInputStream : public ProtoStream
{
public:
/**
* Create an input stream for a given file name. If the filename
* ends with .gz then the file will be decompressed accordingly.
*
* @param filename Path to the file to read from
*/
ProtoInputStream(const std::string& filename);
/**
* Destruct the input stream, and also close the underlying file
* streams and coded streams.
*/
~ProtoInputStream();
/**
* Read a message from the stream.
*
* @param msg Message read from the stream
* @param return True if a message was read, false if reading fails
*/
bool read(google::protobuf::Message& msg);
/**
* Reset the input stream and seek to the beginning of the file.
*/
void reset();
private:
/**
* Create the internal streams that are wrapping the input file.
*/
void createStreams();
/**
* Destroy the internal streams that are wrapping the input file.
*/
void destroyStreams();
/// Underlying file input stream
std::ifstream fileStream;
/// Hold on to the file name for debug messages
const std::string fileName;
/// Boolean flag to remember whether we use gzip or not
bool useGzip;
/// Zero Copy stream wrapping the STL input stream
google::protobuf::io::IstreamInputStream* wrappedFileStream;
/// Optional Gzip stream to wrap the Zero Copy stream
google::protobuf::io::GzipInputStream* gzipStream;
/// Top-level zero-copy stream, either with compression or not
google::protobuf::io::ZeroCopyInputStream* zeroCopyStream;
};
#endif //__PROTO_PROTOIO_HH
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