mist/usb_error.h

// Copyright (c) 2013 The Chromium OS 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 MIST_USB_ERROR_H_
#define MIST_USB_ERROR_H_

#include <ostream>

#include <libusb.h>

#include <base/basictypes.h>

namespace mist {

// A USB error, which represents one of the errors defined by libusb 1.0 in the
// libusb_error enum and some additional errors defined by mist.
class UsbError {
 public:
  enum Type {
    // Errors that correspond to those in the libusb_error enum defined by
    // libusb.
    kSuccess,
    kErrorIO,
    kErrorInvalidParameter,
    kErrorAccess,
    kErrorNoDevice,
    kErrorNotFound,
    kErrorBusy,
    kErrorTimeout,
    kErrorOverflow,
    kErrorPipe,
    kErrorInterrupted,
    kErrorNoMemory,
    kErrorNotSupported,
    kErrorOther,

    // Additional errors.
    kErrorDeviceNotOpen,
    kErrorTransferAlreadyAllocated,
    kErrorTransferNotAllocated
  };

  // Constructs a UsbError object with its error type set to UsbError::kSuccess.
  UsbError();

  // Constructs a UsbError object with its error type set to |type|.
  explicit UsbError(Type type);

  // Constructs a UsbError object with its error type set to a value equivalent
  // to the libusb error |error|.
  explicit UsbError(libusb_error error);

  ~UsbError();

  // Returns true if the error type of this object is set to UsbError::kSuccess,
  // or false otherwise.
  bool IsSuccess() const;

  // Returns a string describing the error type of this object for logging
  // purpose.
  const char* ToString() const;

  // Resets the error type of this object to UsbError::kSuccess.
  void Clear();

  // Sets the error type of this object to a value equivalent to the libusb
  // error |error|. Returns true if the error type of this object is set to
  // UsbError::kSuccess, or false otherwise.
  bool SetFromLibUsbError(libusb_error error);

  Type type() const { return type_; }
  void set_type(Type type) { type_ = type; }

 private:
  Type type_;

  DISALLOW_COPY_AND_ASSIGN(UsbError);
};

}  // namespace mist

// Output stream operator provided to facilitate logging.
std::ostream& operator<<(std::ostream& stream, const mist::UsbError& error);

#endif  // MIST_USB_ERROR_H_