Add getFileSize support to chromium...

chrome/browser/renderer_host/file_system_accessor.cc

+// Copyright (c) 2006-2009 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 "chrome/browser/renderer_host/file_system_accessor.h"
+
+#include "base/file_util.h"
+#include "base/message_loop.h"
+#include "chrome/browser/chrome_thread.h"
+
+FileSystemAccessor::FileSystemAccessor(void* param, FileSizeCallback* callback)
+    : param_(param), callback_(callback) {
+  caller_loop_ = MessageLoop::current();
+}
+
+FileSystemAccessor::~FileSystemAccessor() {
+}
+
+void FileSystemAccessor::RequestFileSize(const FilePath& path,
+                                         void* param,
+                                         FileSizeCallback* callback) {
+  // Getting file size could take long time if it lives on a network share,
+  // so run it on FILE thread.
+  ChromeThread::GetMessageLoop(ChromeThread::FILE)->PostTask(
+      FROM_HERE,
+      NewRunnableMethod(new FileSystemAccessor(param, callback),
+                        &FileSystemAccessor::GetFileSize, path));
+}
+
+void FileSystemAccessor::GetFileSize(const FilePath& path) {
+  int64 result;
+  // Set result to -1 if failed to get file size.
+  if (!file_util::GetFileSize(path, &result))
+    result = -1;
+
+  // Pass the result back to the caller thread.
+  caller_loop_->PostTask(
+    FROM_HERE,
+    NewRunnableMethod(this, &FileSystemAccessor::GetFileSizeCompleted, result));
+}
+
+void FileSystemAccessor::GetFileSizeCompleted(int64 result) {
+  callback_->Run(result, param_);
+}