[fsp] Add support for reading directories.

chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.cc

 // Copyright 2014 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/chromeos/file_system_provider/fileapi/provider_async_file_util.h"
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 27 matching lines @@
 }
 
 // Routes the response of GetFileInfo back to the IO thread.
 void OnGetFileInfo(const fileapi::AsyncFileUtil::GetFileInfoCallback& callback,
                    base::File::Error result,
                    const base::File::Info& file_info) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE, base::Bind(callback, result, file_info));
 }
 
+// Executes ReadDirectory on the UI thread.
+void ReadDirectoryOnUIThread(
+    scoped_ptr<fileapi::FileSystemOperationContext> context,
+    const fileapi::FileSystemURL& url,
+    const fileapi::AsyncFileUtil::ReadDirectoryCallback& callback) {
+  util::FileSystemURLParser parser(url);
+  if (!parser.Parse()) {
+    callback.Run(base::File::FILE_ERROR_NOT_FOUND,
+                 fileapi::AsyncFileUtil::EntryList(),
+                 false /* has_more */);
+    return;
+  }
+
+  parser.file_system()->ReadDirectory(parser.file_path(), callback);
+}
+
+// Routes the response of ReadDirectory back to the IO thread.
+void OnReadDirectory(
+    const fileapi::AsyncFileUtil::ReadDirectoryCallback& callback,
+    base::File::Error result,
+    const fileapi::AsyncFileUtil::EntryList& entry_list,
+    bool has_more) {
+  BrowserThread::PostTask(BrowserThread::IO,
+                          FROM_HERE,
+                          base::Bind(callback, result, entry_list, has_more));
+}
+
 }  // namespace
 
 ProviderAsyncFileUtil::ProviderAsyncFileUtil() {}
 
 ProviderAsyncFileUtil::~ProviderAsyncFileUtil() {}
 
 void ProviderAsyncFileUtil::CreateOrOpen(
     scoped_ptr<fileapi::FileSystemOperationContext> context,
     const fileapi::FileSystemURL& url,
     int file_flags,
@@ skipping 45 matching lines @@
                                      base::Passed(&context),
                                      url,
                                      base::Bind(&OnGetFileInfo, callback)));
 }
 
 void ProviderAsyncFileUtil::ReadDirectory(
     scoped_ptr<fileapi::FileSystemOperationContext> context,
     const fileapi::FileSystemURL& url,
     const ReadDirectoryCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
-  NOTIMPLEMENTED();
-  callback.Run(base::File::FILE_ERROR_NOT_FOUND, EntryList(), false);
+  BrowserThread::PostTask(BrowserThread::UI,
+                          FROM_HERE,
+                          base::Bind(&ReadDirectoryOnUIThread,
+                                     base::Passed(&context),
+                                     url,
+                                     base::Bind(&OnReadDirectory, callback)));
 }
 
 void ProviderAsyncFileUtil::Touch(
     scoped_ptr<fileapi::FileSystemOperationContext> context,
     const fileapi::FileSystemURL& url,
     const base::Time& last_access_time,
     const base::Time& last_modified_time,
     const StatusCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   callback.Run(base::File::FILE_ERROR_SECURITY);
@@ skipping 70 matching lines @@
   NOTIMPLEMENTED();
   callback.Run(base::File::FILE_ERROR_NOT_FOUND,
                base::File::Info(),
                base::FilePath(),
                scoped_refptr<webkit_blob::ShareableFileReference>());
 }
 
 }  // namespace internal
 }  // namespace file_system_provider
 }  // namespace chromeos