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// Copyright (c) 2012 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.
// Client code to talk to the Media Transfer Protocol daemon. The MTP daemon is
// responsible for communicating with PTP / MTP capable devices like cameras
// and smartphones.
#ifndef DEVICE_MEDIA_TRANSFER_PROTOCOL_MEDIA_TRANSFER_PROTOCOL_DAEMON_CLIENT_H_
#define DEVICE_MEDIA_TRANSFER_PROTOCOL_MEDIA_TRANSFER_PROTOCOL_DAEMON_CLIENT_H_
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/callback.h"
#include "build/build_config.h"
#if !defined(OS_LINUX)
#error "Only used on Linux and ChromeOS"
#endif
class MtpFileEntry;
class MtpStorageInfo;
namespace dbus {
class Bus;
}
namespace device {
// A class to make the actual DBus calls for mtpd service.
// This class only makes calls, result/error handling should be done
// by callbacks.
class MediaTransferProtocolDaemonClient {
public:
// A callback to be called when DBus method call fails.
typedef base::Closure ErrorCallback;
// A callback to handle the result of EnumerateAutoMountableDevices.
// The argument is the enumerated storage names.
typedef base::Callback<void(const std::vector<std::string>& storage_names)
> EnumerateStoragesCallback;
// A callback to handle the result of GetStorageInfo.
// The argument is the information about the specified storage.
typedef base::Callback<void(const MtpStorageInfo& storage_info)
> GetStorageInfoCallback;
// A callback to handle the result of OpenStorage.
// The argument is the returned handle.
typedef base::Callback<void(const std::string& handle)> OpenStorageCallback;
// A callback to handle the result of CloseStorage.
typedef base::Closure CloseStorageCallback;
// A callback to handle the result of ReadDirectoryEntryIds.
// The argument is a vector of file ids.
typedef base::Callback<void(const std::vector<uint32>& file_ids)
> ReadDirectoryEntryIdsCallback;
// A callback to handle the result of GetFileInfo.
// The argument is a vector of file entries.
typedef base::Callback<void(const std::vector<MtpFileEntry>& file_entries)
> GetFileInfoCallback;
// A callback to handle the result of ReadFileChunkById.
// The argument is a string containing the file data.
typedef base::Callback<void(const std::string& data)> ReadFileCallback;
// A callback to handle storage attach/detach events.
// The first argument is true for attach, false for detach.
// The second argument is the storage name.
typedef base::Callback<void(bool is_attach,
const std::string& storage_name)
> MTPStorageEventHandler;
virtual ~MediaTransferProtocolDaemonClient();
// Calls EnumerateStorages method. |callback| is called after the
// method call succeeds, otherwise, |error_callback| is called.
virtual void EnumerateStorages(
const EnumerateStoragesCallback& callback,
const ErrorCallback& error_callback) = 0;
// Calls GetStorageInfo method. |callback| is called after the method call
// succeeds, otherwise, |error_callback| is called.
virtual void GetStorageInfo(const std::string& storage_name,
const GetStorageInfoCallback& callback,
const ErrorCallback& error_callback) = 0;
// Calls OpenStorage method. |callback| is called after the method call
// succeeds, otherwise, |error_callback| is called.
// OpenStorage returns a handle in |callback|.
virtual void OpenStorage(const std::string& storage_name,
const std::string& mode,
const OpenStorageCallback& callback,
const ErrorCallback& error_callback) = 0;
// Calls CloseStorage method. |callback| is called after the method call
// succeeds, otherwise, |error_callback| is called.
// |handle| comes from a OpenStorageCallback.
virtual void CloseStorage(const std::string& handle,
const CloseStorageCallback& callback,
const ErrorCallback& error_callback) = 0;
// Calls ReadDirectoryEntryIds method. |callback| is called after the method
// call succeeds, otherwise, |error_callback| is called.
// |file_id| is a MTP-device specific id for a file.
virtual void ReadDirectoryEntryIds(
const std::string& handle,
uint32 file_id,
const ReadDirectoryEntryIdsCallback& callback,
const ErrorCallback& error_callback) = 0;
// Calls GetFileInfo method. |callback| is called after the method
// call succeeds, otherwise, |error_callback| is called.
// |file_ids| is a list of MTP-device specific file ids.
// |offset| is the index into |file_ids| to read from.
// |entries_to_read| is the maximum number of file entries to read.
virtual void GetFileInfo(const std::string& handle,
const std::vector<uint32>& file_ids,
size_t offset,
size_t entries_to_read,
const GetFileInfoCallback& callback,
const ErrorCallback& error_callback) = 0;
// Calls ReadFileChunk method. |callback| is called after the method call
// succeeds, otherwise, |error_callback| is called.
// |file_id| is a MTP-device specific id for a file.
// |offset| is the offset into the file.
// |bytes_to_read| cannot exceed 1 MiB.
virtual void ReadFileChunk(const std::string& handle,
uint32 file_id,
uint32 offset,
uint32 bytes_to_read,
const ReadFileCallback& callback,
const ErrorCallback& error_callback) = 0;
// Registers given callback for events. Should only be called once.
// |storage_event_handler| is called when a mtp storage attach or detach
// signal is received.
virtual void ListenForChanges(const MTPStorageEventHandler& handler) = 0;
// Factory function, creates a new instance and returns ownership.
static MediaTransferProtocolDaemonClient* Create(dbus::Bus* bus);
protected:
// Create() should be used instead.
MediaTransferProtocolDaemonClient();
private:
DISALLOW_COPY_AND_ASSIGN(MediaTransferProtocolDaemonClient);
};
} // namespace device
#endif // DEVICE_MEDIA_TRANSFER_PROTOCOL_MEDIA_TRANSFER_PROTOCOL_DAEMON_CLIENT_H_
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