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diff --git a/src/proto/protoio.cc b/src/proto/protoio.cc
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+++ b/src/proto/protoio.cc
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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
+ */
+
+#include "base/misc.hh"
+#include "proto/protoio.hh"
+
+using namespace std;
+using namespace google::protobuf;
+
+ProtoOutputStream::ProtoOutputStream(const string& filename) :
+    fileStream(filename.c_str(), ios::out | ios::binary | ios::trunc),
+    zeroCopyStream(NULL), gzipStream(NULL), codedStream(NULL)
+{
+    if (!fileStream.good())
+        panic("Could not open %s for writing\n", filename);
+
+    // Wrap the output file in a zero copy stream, that in turn is
+    // wrapped in a gzip stream if the filename ends with .gz. The
+    // latter stream is in turn wrapped in a coded stream
+    zeroCopyStream = new io::OstreamOutputStream(&fileStream);
+    if (filename.find_last_of('.') != string::npos &&
+        filename.substr(filename.find_last_of('.') + 1) == "gz") {
+        gzipStream = new io::GzipOutputStream(zeroCopyStream);
+        codedStream = new io::CodedOutputStream(gzipStream);
+    } else {
+        codedStream = new io::CodedOutputStream(zeroCopyStream);
+    }
+
+    // Use the ASCII characters gem5 as our magic number and write it
+    // to the file
+    const uint32_t magic_number = 0x356d6567;
+    codedStream->WriteLittleEndian32(magic_number);
+
+    // Note that each type of stream (packet, instruction etc) should
+    // add its own header and perform the appropriate checks
+}
+
+ProtoOutputStream::~ProtoOutputStream()
+{
+    delete codedStream;
+    // As the compression is optional, see if the stream exists
+    if (gzipStream != NULL)
+        delete gzipStream;
+    delete zeroCopyStream;
+    fileStream.close();
+}
+
+void
+ProtoOutputStream::write(const Message& msg)
+{
+    // Write the size of the message to the stream
+    codedStream->WriteVarint32(msg.ByteSize());
+
+    // Write the message itself to the stream
+    if (!msg.SerializeToCodedStream(codedStream))
+        panic("Unable to write message to coded stream\n");
+}