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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.
+ */
+
+#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 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:
+
+    /**
+     * 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* zeroCopyStream;
+
+    /// Optional Gzip stream to wrap the Zero Copy stream
+    google::protobuf::io::GzipOutputStream* gzipStream;
+
+    /// Top-level coded stream that messages are written to
+    google::protobuf::io::CodedOutputStream* codedStream;
+
+};
+
+#endif //__PROTO_PROTOIO_HH