net: extract GetDirectoryListingXXX functions into directory_listing.*

net/base/directory_listing.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2015 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/base/net_util.h"
+#include "net/base/directory_listing.h"
 
 #include "base/i18n/time_formatting.h"
 #include "base/json/string_escape.h"
+#include "base/logging.h"
+#include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "net/base/escape.h"
+#include "net/base/net_module.h"
+#include "net/grit/net_resources.h"
 
 namespace net {
 
+std::string GetDirectoryListingHeader(const base::string16& title) {
+  static const base::StringPiece header(
+      NetModule::GetResource(IDR_DIR_HEADER_HTML));
+  // This can be null in unit tests.
+  DLOG_IF(WARNING, header.empty())
+      << "Missing resource: directory listing header";
+
+  std::string result;
+  if (!header.empty())
+    result.assign(header.data(), header.size());
+
+  result.append("<script>start(");
+  base::EscapeJSONString(title, true, &result);
+  result.append(");</script>\n");
+
+  return result;
+}
+
 std::string GetDirectoryListingEntry(const base::string16& name,
                                      const std::string& raw_bytes,
                                      bool is_dir,
                                      int64_t size,
                                      base::Time modified) {
   std::string result;
   result.append("<script>addRow(");
   base::EscapeJSONString(name, true, &result);
   result.append(",");
   if (raw_bytes.empty()) {
@@ skipping 21 matching lines @@
   if (!modified.is_null())
     modified_str = base::TimeFormatShortDateAndTime(modified);
   base::EscapeJSONString(modified_str, true, &result);
 
   result.append(");</script>\n");
 
   return result;
 }
 
 }  // namespace net