device/serial/buffer.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef DEVICE_SERIAL_BUFFER_H_
   6 #define DEVICE_SERIAL_BUFFER_H_
   7
   8 #include "base/basictypes.h"
   9
  10 namespace device {
  11
  12 // A fixed-size read-only buffer. The data-reader should call Done() when it is
  13 // finished reading bytes from the buffer. Alternatively, the reader can report
  14 // an error by calling DoneWithError() with the number of bytes read and the
  15 // error it wishes to report.
  16 class ReadOnlyBuffer {
  17  public:
  18   virtual ~ReadOnlyBuffer();
  19   virtual const char* GetData() = 0;
  20   virtual uint32_t GetSize() = 0;
  21   virtual void Done(uint32_t bytes_read) = 0;
  22   virtual void DoneWithError(uint32_t bytes_read, int32_t error) = 0;
  23 };
  24
  25 // A fixed-size writable buffer. The data-writer should call Done() when it is
  26 // finished writing bytes to the buffer. Alternatively, the writer can report
  27 // an error by calling DoneWithError() with the number of bytes written and the
  28 // error it wishes to report.
  29 class WritableBuffer {
  30  public:
  31   virtual ~WritableBuffer();
  32   virtual char* GetData() = 0;
  33   virtual uint32_t GetSize() = 0;
  34   virtual void Done(uint32_t bytes_written) = 0;
  35   virtual void DoneWithError(uint32_t bytes_written, int32_t error) = 0;
  36 };
  37
  38 }  // namespace device
  39
  40 #endif  // DEVICE_SERIAL_BUFFER_H_