Add a command line tool for printing QUIC crypto handshake messages.

net/tools/quic/crypto_message_printer_bin.cc

Index: net/tools/quic/crypto_message_printer_bin.cc
diff --git a/net/tools/quic/crypto_message_printer_bin.cc b/net/tools/quic/crypto_message_printer_bin.cc
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Dumps the contents of a QUIC crypto handshake message in a human readable
+// format.
+//
+// Usage: crypto_message_printer_bin <hex of message>
+
+#include <iostream>
+
+#include "base/command_line.h"
+#include "net/quic/crypto/crypto_framer.h"
+#include "net/quic/quic_utils.h"
+
+using std::cerr;
+using std::cout;
+using std::endl;
+
+namespace net {
+
+class NET_EXPORT_PRIVATE CryptoMessagePrinter
+    : public net::CryptoFramerVisitorInterface {
+ public:
+  void OnHandshakeMessage(const CryptoHandshakeMessage& message) override {
+    cout << message.DebugString() << endl;
+  }
+
+  void OnError(CryptoFramer* framer) override {
+    cerr << "Error code: " << framer->error() << endl;
+    cerr << "Error details: " << framer->error_detail() << endl;
+  }
+};
+
+}  // namespace net
+
+int main(int argc, char* argv[]) {
+  base::CommandLine::Init(argc, argv);
+
+  if (argc != 2) {
+    cerr << "Usage: " << argv[0] << " <hex of message>\n";
+    return 1;
+  }
+
+  net::CryptoMessagePrinter printer;
+  net::CryptoFramer framer;
+  framer.set_visitor(&printer);
+  std::string input = net::QuicUtils::HexDecode(argv[1]);
+  if (!framer.ProcessInput(input)) {
+    return 1;
+  }
+  if (framer.InputBytesRemaining() != 0) {
+    cerr << "Input partially consumed. " << framer.InputBytesRemaining()
+         << " bytes remaining." << endl;
+    return 2;
+  }
+  return 0;
+}