[fsp] First part of support for reading files.

chrome/browser/chromeos/file_system_provider/fake_provided_file_system.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/fake_provided_file_system.h"
 
 #include <string>
 
 #include "base/files/file.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "extensions/browser/event_router.h"
+#include "net/base/io_buffer.h"
 
 namespace chromeos {
 namespace file_system_provider {
 namespace {
 
 // Adds a fake entry to the entry list.
 void AddDirectoryEntry(fileapi::AsyncFileUtil::EntryList* entry_list,
                        const std::string& name,
                        fileapi::DirectoryEntry::DirectoryEntryType type,
                        int64 size,
@@ skipping 100 matching lines @@
                                       OpenFileMode mode,
                                       bool create,
                                       const OpenFileCallback& callback) {
   if (file_path.AsUTF8Unsafe() != "/hello.txt" ||
       mode == OPEN_FILE_MODE_WRITE || create) {
     callback.Run(0 /* file_handle */, base::File::FILE_ERROR_SECURITY);
     return;
   }
 
   const int file_handle = ++last_file_handle_;
+  opened_files_.insert(file_handle);
   callback.Run(file_handle, base::File::FILE_OK);
 }
 
 void FakeProvidedFileSystem::CloseFile(
     int file_handle,
     const fileapi::AsyncFileUtil::StatusCallback& callback) {
   const std::set<int>::iterator opened_file_it =
       opened_files_.find(file_handle);
   if (opened_file_it == opened_files_.end()) {
-    callback.Run(base::File::FILE_ERROR_NOT_FOUND);
+    base::MessageLoopProxy::current()->PostTask(
+        FROM_HERE, base::Bind(callback, base::File::FILE_ERROR_NOT_FOUND));
     return;
   }
 
   opened_files_.erase(opened_file_it);
-  callback.Run(base::File::FILE_OK);
+  base::MessageLoopProxy::current()->PostTask(
+      FROM_HERE, base::Bind(callback, base::File::FILE_OK));
+}
+
+void FakeProvidedFileSystem::ReadFile(
+    int file_handle,
+    net::IOBuffer* buffer,
+    int64 offset,
+    int length,
+    const ProvidedFileSystemInterface::ReadChunkReceivedCallback& callback) {
+  // TODO(mtomasz): Implement together with the FileStreamReader.
+  base::MessageLoopProxy::current()->PostTask(
+      FROM_HERE,
+      base::Bind(callback,
+                 0 /* chunk_length */,
+                 false /* has_next */,
+                 base::File::FILE_ERROR_SECURITY));
 }
 
 const ProvidedFileSystemInfo& FakeProvidedFileSystem::GetFileSystemInfo()
     const {
   return file_system_info_;
 }
 
 RequestManager* FakeProvidedFileSystem::GetRequestManager() {
   NOTREACHED();
   return NULL;
 }
 
 ProvidedFileSystemInterface* FakeProvidedFileSystem::Create(
     extensions::EventRouter* event_router,
     const ProvidedFileSystemInfo& file_system_info) {
   return new FakeProvidedFileSystem(file_system_info);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos