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// 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/backend_delegate.h"
#include "base/memory/scoped_ptr.h"
#include "chrome/browser/chromeos/file_system_provider/fileapi/buffering_file_stream_reader.h"
#include "chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.h"
#include "chrome/browser/chromeos/file_system_provider/fileapi/file_stream_writer.h"
#include "chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.h"
#include "content/public/browser/browser_thread.h"
#include "webkit/browser/blob/file_stream_reader.h"
#include "webkit/browser/fileapi/file_stream_writer.h"
#include "webkit/browser/fileapi/file_system_url.h"
using content::BrowserThread;
namespace chromeos {
namespace file_system_provider {
namespace {
// Size of the stream reader internal buffer. At most this number of bytes will
// be read ahead of the requested data.
const int kReaderBufferSize = 512 * 1024; // 512KB.
} // namespace
BackendDelegate::BackendDelegate()
: async_file_util_(new internal::ProviderAsyncFileUtil) {}
BackendDelegate::~BackendDelegate() {}
storage::AsyncFileUtil* BackendDelegate::GetAsyncFileUtil(
storage::FileSystemType type) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK_EQ(storage::kFileSystemTypeProvided, type);
return async_file_util_.get();
}
scoped_ptr<storage::FileStreamReader> BackendDelegate::CreateFileStreamReader(
const storage::FileSystemURL& url,
int64 offset,
const base::Time& expected_modification_time,
storage::FileSystemContext* context) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK_EQ(storage::kFileSystemTypeProvided, url.type());
return scoped_ptr<storage::FileStreamReader>(new BufferingFileStreamReader(
scoped_ptr<storage::FileStreamReader>(new FileStreamReader(
context, url, offset, expected_modification_time)),
kReaderBufferSize));
}
scoped_ptr<storage::FileStreamWriter> BackendDelegate::CreateFileStreamWriter(
const storage::FileSystemURL& url,
int64 offset,
storage::FileSystemContext* context) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK_EQ(storage::kFileSystemTypeProvided, url.type());
return scoped_ptr<storage::FileStreamWriter>(
new FileStreamWriter(url, offset));
}
} // namespace file_system_provider
} // namespace chromeos
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