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// Copyright 2018 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.
#ifndef COMPONENTS_DOWNLOAD_PUBLIC_COMMON_INPUT_STREAM_H_
#define COMPONENTS_DOWNLOAD_PUBLIC_COMMON_INPUT_STREAM_H_
#include "components/download/public/common/download_export.h"
#include "components/download/public/common/download_interrupt_reasons.h"
#include "mojo/public/cpp/system/simple_watcher.h"
#include "net/base/io_buffer.h"
namespace download {
// Input stream for the download system to read after network response is
// received.
class COMPONENTS_DOWNLOAD_EXPORT InputStream {
public:
// Results for reading the InputStream.
enum StreamState {
EMPTY = 0,
HAS_DATA,
WAIT_FOR_COMPLETION, // No more data to read, waiting for completion status
COMPLETE,
};
virtual ~InputStream();
// Initializes the inputStream object.
virtual void Initialize();
// Returns true if the input stream contains no data, or false otherwise.
virtual bool IsEmpty() = 0;
// Register/clear callbacks when data become available.
virtual void RegisterDataReadyCallback(
const mojo::SimpleWatcher::ReadyCallback& callback);
virtual void ClearDataReadyCallback();
// Registers stream completion callback if needed.
virtual void RegisterCompletionCallback(base::OnceClosure callback);
// Reads data from the stream into |data|, |length| is the number of bytes
// returned.
virtual StreamState Read(scoped_refptr<net::IOBuffer>* data,
size_t* length) = 0;
// Returns the completion status.
virtual DownloadInterruptReason GetCompletionStatus() = 0;
};
} // namespace download
#endif // COMPONENTS_DOWNLOAD_PUBLIC_COMMON_INPUT_STREAM_H_
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