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diff --git a/third_party/protobuf/3.4.0/src/google/protobuf/testing/zcgunzip.cc b/third_party/protobuf/3.4.0/src/google/protobuf/testing/zcgunzip.cc
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+++ b/third_party/protobuf/3.4.0/src/google/protobuf/testing/zcgunzip.cc
@@ -0,0 +1,80 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2009 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// 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 Google Inc. 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.
+
+// Author: brianolson@google.com (Brian Olson)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// Test program to verify that GzipInputStream is compatible with command line
+// gunzip or java.util.zip.GzipInputStream
+//
+// Reads gzip stream on standard input and writes decompressed data to standard
+// output.
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+
+#ifdef _WIN32
+#ifndef STDIN_FILENO
+#define STDIN_FILENO 0
+#endif
+#ifndef STDOUT_FILENO
+#define STDOUT_FILENO 1
+#endif
+#endif
+
+#include <google/protobuf/io/gzip_stream.h>
+#include <google/protobuf/io/zero_copy_stream_impl.h>
+
+using google::protobuf::io::FileInputStream;
+using google::protobuf::io::GzipInputStream;
+
+int main(int argc, const char** argv) {
+  FileInputStream fin(STDIN_FILENO);
+  GzipInputStream in(&fin);
+
+  while (true) {
+    const void* inptr;
+    int inlen;
+    bool ok;
+    ok = in.Next(&inptr, &inlen);
+    if (!ok) {
+      break;
+    }
+    if (inlen > 0) {
+      int err = write(STDOUT_FILENO, inptr, inlen);
+      assert(err == inlen);
+    }
+  }
+
+  return 0;
+}