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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_FILE_STREAM_READER_H_
#define CHROME_BROWSER_ASH_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_FILE_STREAM_READER_H_
#include <memory>
#include <vector>
#include "base/functional/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "net/base/completion_once_callback.h"
#include "storage/browser/file_system/file_stream_reader.h"
class GURL;
namespace storage {
class FileSystemURL;
} // namespace storage
namespace arc {
// FileStreamReader implementation for ARC documents provider file system.
// It actually delegates operations to ArcContentFileSystemFileStreamReader.
// TODO(crbug.com/678886): Write unit tests.
class ArcDocumentsProviderFileStreamReader : public storage::FileStreamReader {
public:
ArcDocumentsProviderFileStreamReader(const storage::FileSystemURL& url,
int64_t offset);
ArcDocumentsProviderFileStreamReader(
const ArcDocumentsProviderFileStreamReader&) = delete;
ArcDocumentsProviderFileStreamReader& operator=(
const ArcDocumentsProviderFileStreamReader&) = delete;
~ArcDocumentsProviderFileStreamReader() override;
// storage::FileStreamReader override:
int Read(net::IOBuffer* buffer,
int buffer_length,
net::CompletionOnceCallback callback) override;
int64_t GetLength(net::Int64CompletionOnceCallback callback) override;
private:
void OnResolveToContentUrl(const GURL& content_url);
void RunPendingRead(scoped_refptr<net::IOBuffer> buffer,
int buffer_length,
net::CompletionOnceCallback callback);
void RunPendingGetLength(net::Int64CompletionOnceCallback callback);
const int64_t offset_;
bool content_url_resolved_;
std::unique_ptr<storage::FileStreamReader> underlying_reader_;
std::vector<base::OnceClosure> pending_operations_;
base::WeakPtrFactory<ArcDocumentsProviderFileStreamReader> weak_ptr_factory_{
this};
};
} // namespace arc
#endif // CHROME_BROWSER_ASH_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_FILE_STREAM_READER_H_
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