Print Preview: Fix failure to save with long page title

ui/shell_dialogs/select_file_dialog.cc

 // 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.
 
 #include "ui/shell_dialogs/select_file_dialog.h"
 
 #include <stddef.h>
+#include <algorithm>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "ui/shell_dialogs/select_file_dialog_factory.h"
 #include "ui/shell_dialogs/select_file_policy.h"
 #include "ui/shell_dialogs/selected_file_info.h"
@@ skipping 49 matching lines @@
     ui::SelectFilePolicy* policy) {
   if (dialog_factory_) {
     SelectFileDialog* dialog = dialog_factory_->Create(listener, policy);
     if (dialog)
       return dialog;
   }
 
   return CreateSelectFileDialog(listener, policy);
 }
 
+base::FilePath SelectFileDialog::GetShortenedFilePath(
+    const base::FilePath& path) {
+  const size_t kMaxNameLength = 255;
+  if (path.BaseName().value().length() <= kMaxNameLength)
+    return path;
+  base::FilePath filename = path.BaseName();
+  base::FilePath::StringType extension = filename.FinalExtension();
+  filename = filename.RemoveFinalExtension();
+  base::FilePath::StringType file_string = filename.value();
+  // 1 for . plus 12 for longest known extension.
+  size_t max_extension_length = 13;
+  if (file_string.length() < kMaxNameLength) {
+    max_extension_length =
+        std::max(max_extension_length, kMaxNameLength - file_string.length());
+  }
+  if (extension.length() > max_extension_length) {
+    // Take the first max_extension_length characters (this will be the
+    // leading '.' plus the next max_extension_length - 1).
+    extension.resize(max_extension_length);
+  }
+  file_string.resize(kMaxNameLength - extension.length());
+  return path.DirName().Append(file_string).AddExtension(extension);
+}
+
 void SelectFileDialog::SelectFile(
     Type type,
     const base::string16& title,
     const base::FilePath& default_path,
     const FileTypeInfo* file_types,
     int file_type_index,
     const base::FilePath::StringType& default_extension,
     gfx::NativeWindow owning_window,
     void* params) {
   DCHECK(listener_);
 
   if (select_file_policy_.get() &&
       !select_file_policy_->CanOpenSelectFileDialog()) {
     select_file_policy_->SelectFileDenied();
 
     // Inform the listener that no file was selected.
     // Post a task rather than calling FileSelectionCanceled directly to ensure
     // that the listener is called asynchronously.
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::Bind(&SelectFileDialog::CancelFileSelection, this, params));
     return;
   }
 
+  base::FilePath path = GetShortenedFilePath(default_path);
+
   // Call the platform specific implementation of the file selection dialog.
-  SelectFileImpl(type, title, default_path, file_types, file_type_index,
+  SelectFileImpl(type, title, path, file_types, file_type_index,
                  default_extension, owning_window, params);
 }
 
 bool SelectFileDialog::HasMultipleFileTypeChoices() {
   return HasMultipleFileTypeChoicesImpl();
 }
 
 SelectFileDialog::SelectFileDialog(Listener* listener,
                                    ui::SelectFilePolicy* policy)
     : listener_(listener),
       select_file_policy_(policy) {
   DCHECK(listener_);
 }
 
 SelectFileDialog::~SelectFileDialog() {}
 
 void SelectFileDialog::CancelFileSelection(void* params) {
   if (listener_)
     listener_->FileSelectionCanceled(params);
 }
 
 }  // namespace ui