Blob support for IDB [Chromium]

webkit/browser/fileapi/local_file_stream_writer.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 "webkit/browser/fileapi/local_file_stream_writer.h"
 
 #include "base/callback.h"
 #include "base/message_loop/message_loop.h"
 #include "net/base/file_stream.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 
 namespace fileapi {
 
 namespace {
 
 const int kOpenFlagsForWrite = base::PLATFORM_FILE_OPEN |
                                base::PLATFORM_FILE_WRITE |
                                base::PLATFORM_FILE_ASYNC;
+const int kCreateFlagsForWrite = base::PLATFORM_FILE_CREATE |
+                                 base::PLATFORM_FILE_WRITE |
+                                 base::PLATFORM_FILE_ASYNC;
 
 }  // namespace
 
 LocalFileStreamWriter::LocalFileStreamWriter(base::TaskRunner* task_runner,
                                              const base::FilePath& file_path,
-                                             int64 initial_offset)
+                                             int64 initial_offset,
+                                             bool open_not_create)
     : file_path_(file_path),
+      open_not_create_(open_not_create),
       initial_offset_(initial_offset),
       has_pending_operation_(false),
       weak_factory_(this),
       task_runner_(task_runner) {}
 
 LocalFileStreamWriter::~LocalFileStreamWriter() {
   // Invalidate weak pointers so that we won't receive any callbacks from
   // in-flight stream operations, which might be triggered during the file close
   // in the FileStream destructor.
   weak_factory_.InvalidateWeakPtrs();
@@ skipping 46 matching lines @@
 
 int LocalFileStreamWriter::InitiateOpen(
     const net::CompletionCallback& error_callback,
     const base::Closure& main_operation) {
   DCHECK(has_pending_operation_);
   DCHECK(!stream_impl_.get());
 
   stream_impl_.reset(new net::FileStream(NULL, task_runner_));
 
   return stream_impl_->Open(file_path_,
-                            kOpenFlagsForWrite,
+                            open_not_create_ ? kOpenFlagsForWrite :
+                              kCreateFlagsForWrite,
                             base::Bind(&LocalFileStreamWriter::DidOpen,
                                        weak_factory_.GetWeakPtr(),
                                        error_callback,
                                        main_operation));
 }
 
 void LocalFileStreamWriter::DidOpen(
     const net::CompletionCallback& error_callback,
     const base::Closure& main_operation,
     int result) {
@@ skipping 120 matching lines @@
     return false;
 
   net::CompletionCallback pending_cancel = cancel_callback_;
   has_pending_operation_ = false;
   cancel_callback_.Reset();
   pending_cancel.Run(net::OK);
   return true;
 }
 
 }  // namespace fileapi