Certificate Transparency: Ensure timestamps over 32 bit are handled correctly.

net/cert/signed_tree_head.cc

 // Copyright 2016 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.
 
 #include "net/cert/signed_tree_head.h"
 
 #include <string.h>
 
+#include <iostream>
+
 #include "base/strings/string_number_conversions.h"
 
 namespace net {
 namespace ct {
 
 SignedTreeHead::SignedTreeHead() {}
 
 SignedTreeHead::SignedTreeHead(Version version,
                                const base::Time& timestamp,
                                uint64_t tree_size,
                                const char sha256_root_hash[kSthRootHashLength],
                                const DigitallySigned& signature,
                                const std::string& log_id)
     : version(version),
       timestamp(timestamp),
       tree_size(tree_size),
       signature(signature),
       log_id(log_id) {
   memcpy(this->sha256_root_hash, sha256_root_hash, kSthRootHashLength);
 }
 
 SignedTreeHead::~SignedTreeHead() {}
 
-std::ostream& operator<<(std::ostream& stream, const SignedTreeHead& sth) {
-  return stream << "{\n"
-                << "\t\"version\": " << sth.version << ",\n"
-                << "\t\"timestamp\": " << sth.timestamp << ",\n"
-                << "\t\"tree_size\": " << sth.tree_size << ",\n"
-                << "\t\"sha256_root_hash\": \""
-                << base::HexEncode(sth.sha256_root_hash, kSthRootHashLength)
-                << "\",\n\t\"log_id\": \""
-                << base::HexEncode(sth.log_id.data(), sth.log_id.size())
-                << "\"\n"
-                << "}";
+void PrintTo(const SignedTreeHead& sth, std::ostream* os) {
+  (*os) << "{\n"
+        << "\t\"version\": " << sth.version << ",\n"
+        << "\t\"timestamp\": " << sth.timestamp << ",\n"
+        << "\t\"tree_size\": " << sth.tree_size << ",\n"
+        << "\t\"sha256_root_hash\": \""
+        << base::HexEncode(sth.sha256_root_hash, kSthRootHashLength)
+        << "\",\n\t\"log_id\": \""
+        << base::HexEncode(sth.log_id.data(), sth.log_id.size()) << "\"\n"
+        << "}";
 }
 
 }  // namespace ct
 }  // namespace net