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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.
#ifndef DEVICE_SERIAL_BUFFER_H_
#define DEVICE_SERIAL_BUFFER_H_
#include <stdint.h>
#include "base/callback.h"
#include "device/serial/serial.mojom.h"
#include "net/base/io_buffer.h"
namespace device {
// A fixed-size read-only buffer. The data-reader should call Done() when it is
// finished reading bytes from the buffer. Alternatively, the reader can report
// an error by calling DoneWithError() with the number of bytes read and the
// error it wishes to report.
class ReadOnlyBuffer {
public:
virtual ~ReadOnlyBuffer();
virtual const char* GetData() = 0;
virtual uint32_t GetSize() = 0;
virtual void Done(uint32_t bytes_read) = 0;
virtual void DoneWithError(uint32_t bytes_read, int32_t error) = 0;
};
// A fixed-size writable buffer. The data-writer should call Done() when it is
// finished writing bytes to the buffer. Alternatively, the writer can report
// an error by calling DoneWithError() with the number of bytes written and the
// error it wishes to report.
class WritableBuffer {
public:
virtual ~WritableBuffer();
virtual char* GetData() = 0;
virtual uint32_t GetSize() = 0;
virtual void Done(uint32_t bytes_written) = 0;
virtual void DoneWithError(uint32_t bytes_written, int32_t error) = 0;
};
// A useful basic implementation of a ReadOnlyBuffer in which the data is
// initialized via a character vector.
class SendBuffer : public device::ReadOnlyBuffer {
public:
SendBuffer(
const std::vector<char>& data,
const base::Callback<void(int, device::serial::SendError)>& callback);
~SendBuffer() override;
const char* GetData() override;
uint32_t GetSize() override;
void Done(uint32_t bytes_read) override;
void DoneWithError(uint32_t bytes_read, int32_t error) override;
private:
const std::vector<char> data_;
const base::Callback<void(int, device::serial::SendError)> callback_;
};
// A useful basic implementation of a WritableBuffer in which the data is
// stored in a net::IOBuffer.
class ReceiveBuffer : public device::WritableBuffer {
public:
ReceiveBuffer(
scoped_refptr<net::IOBuffer> buffer,
uint32_t size,
const base::Callback<void(int, device::serial::ReceiveError)>& callback);
~ReceiveBuffer() override;
char* GetData() override;
uint32_t GetSize() override;
void Done(uint32_t bytes_written) override;
void DoneWithError(uint32_t bytes_written, int32_t error) override;
private:
scoped_refptr<net::IOBuffer> buffer_;
const uint32_t size_;
const base::Callback<void(int, device::serial::ReceiveError)> callback_;
};
} // namespace device
#endif // DEVICE_SERIAL_BUFFER_H_
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