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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "storage/browser/file_system/memory_file_stream_writer.h"
#include <memory>
#include <utility>
#include "base/memory/ptr_util.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
namespace storage {
MemoryFileStreamWriter::MemoryFileStreamWriter(
scoped_refptr<base::TaskRunner> task_runner,
base::WeakPtr<ObfuscatedFileUtilMemoryDelegate> memory_file_util,
const base::FilePath& file_path,
int64_t initial_offset)
: memory_file_util_(std::move(memory_file_util)),
task_runner_(std::move(task_runner)),
file_path_(file_path),
offset_(initial_offset) {
DCHECK(memory_file_util_.MaybeValid());
has_pending_operation_ = false;
}
MemoryFileStreamWriter::~MemoryFileStreamWriter() = default;
int MemoryFileStreamWriter::Write(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback) {
DCHECK(!has_pending_operation_);
DCHECK(cancel_callback_.is_null());
has_pending_operation_ = true;
task_runner_->PostTaskAndReplyWithResult(
FROM_HERE,
base::BindOnce(
[](base::WeakPtr<ObfuscatedFileUtilMemoryDelegate> util,
const base::FilePath& path, int64_t offset,
scoped_refptr<net::IOBuffer> buf, int buf_len) -> int {
if (!util)
return net::ERR_FILE_NOT_FOUND;
base::File::Info file_info;
if (util->GetFileInfo(path, &file_info) != base::File::FILE_OK)
return net::ERR_FILE_NOT_FOUND;
return util->WriteFile(path, offset, std::move(buf), buf_len);
},
memory_file_util_, file_path_, offset_, base::WrapRefCounted(buf),
buf_len),
base::BindOnce(&MemoryFileStreamWriter::OnWriteCompleted,
weak_factory_.GetWeakPtr(), std::move(callback)));
return net::ERR_IO_PENDING;
}
void MemoryFileStreamWriter::OnWriteCompleted(
net::CompletionOnceCallback callback,
int result) {
DCHECK(has_pending_operation_);
if (CancelIfRequested())
return;
has_pending_operation_ = false;
if (result > 0)
offset_ += result;
std::move(callback).Run(result);
}
int MemoryFileStreamWriter::Cancel(net::CompletionOnceCallback callback) {
if (!has_pending_operation_)
return net::ERR_UNEXPECTED;
DCHECK(!callback.is_null());
cancel_callback_ = std::move(callback);
return net::ERR_IO_PENDING;
}
int MemoryFileStreamWriter::Flush(FlushMode /*flush_mode*/,
net::CompletionOnceCallback /*callback*/) {
DCHECK(!has_pending_operation_);
DCHECK(cancel_callback_.is_null());
return net::OK;
}
bool MemoryFileStreamWriter::CancelIfRequested() {
DCHECK(has_pending_operation_);
if (cancel_callback_.is_null())
return false;
has_pending_operation_ = false;
std::move(cancel_callback_).Run(net::OK);
return true;
}
} // namespace storage
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