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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
**
**************************************************************************/

#ifndef TCFTRKENGINE_H
#define TCFTRKENGINE_H

#include "symbianutils_global.h"
#include "tcftrkmessage.h"
#include "callback.h"
#include "json.h"

#include <QtCore/QObject>
#include <QtCore/QSharedPointer>
#include <QtCore/QVector>
#include <QtCore/QVariant>
#include <QtCore/QStringList>

QT_BEGIN_NAMESPACE
class QIODevice;
class QTextStream;
QT_END_NAMESPACE

namespace tcftrk {

struct TcfTrkDevicePrivate;
struct Breakpoint;

/* Command error handling in TCF:
 * 1) 'Severe' errors (JSON format, parameter format): Trk emits a
 *     nonstandard message (\3\2 error paramaters) and closes the connection.
 * 2) Protocol errors: 'N' without error message is returned.
 * 3) Errors in command execution: 'R' with a TCF error hash is returned
 *    (see TcfTrkCommandError). */

/* Error code return in 'R' reply to command
 * (see top of 'Services' documentation). */
struct SYMBIANUTILS_EXPORT TcfTrkCommandError {
    TcfTrkCommandError();
    void clear();
    operator bool() const { return timeMS != 0; }
    QString toString() const;
    void write(QTextStream &str) const;
    bool parse(const QVector<JsonValue> &values);

    quint64 timeMS; // Since 1.1.1970
    int code;
    QByteArray format; // message
    // 'Alternative' meaning, like altOrg="POSIX"/altCode=<some errno>
    QByteArray alternativeOrganization;
    int alternativeCode;
};

/* Answer to a Tcf command passed to the callback. */
struct SYMBIANUTILS_EXPORT TcfTrkCommandResult {
    enum Type {
        SuccessReply,       // 'R' and no error -> all happy.
        CommandErrorReply,  // 'R' with TcfTrkCommandError received
        ProgressReply,      // 'P', progress indicator
        FailReply           // 'N' Protocol NAK, severe error
    };

    explicit TcfTrkCommandResult(Type t = SuccessReply);
    explicit TcfTrkCommandResult(char typeChar, Services service,
                                 const QByteArray &request,
                                 const QVector<JsonValue> &values,
                                 const QVariant &cookie);

    QString toString() const;
    QString errorString() const;
    operator bool() const { return type == SuccessReply || type == ProgressReply; }

    Type type;
    Services service;
    QByteArray request;
    TcfTrkCommandError commandError;
    QVector<JsonValue> values;
    QVariant cookie;
};

typedef trk::Callback<const TcfTrkCommandResult &> TcfTrkCallback;

/* TcfTrkDevice: TCF communication helper using an asynchronous QIODevice
 * implementing the TCF protocol according to:
http://dev.eclipse.org/svnroot/dsdp/org.eclipse.tm.tcf/trunk/docs/TCF%20Specification.html
http://dev.eclipse.org/svnroot/dsdp/org.eclipse.tm.tcf/trunk/docs/TCF%20Services.html
 * Commands can be sent along with callbacks that are passed a
 * TcfTrkCommandResult and an opaque QVariant cookie. In addition, events are emitted.
*/

class SYMBIANUTILS_EXPORT TcfTrkDevice : public QObject
{
    Q_PROPERTY(unsigned verbose READ verbose WRITE setVerbose)
    Q_OBJECT
public:
    enum MessageType { MessageWithReply,
                       MessageWithoutReply, /* Non-standard: "Settings:set" command does not reply */
                       NoopMessage };

    typedef QSharedPointer<QIODevice> IODevicePtr;

    explicit TcfTrkDevice(QObject *parent = 0);
    virtual ~TcfTrkDevice();

    unsigned verbose() const;

    // Mapping of register names for indices
    QVector<QByteArray> registerNames() const;
    void setRegisterNames(const QVector<QByteArray>& n);

    IODevicePtr device() const;
    IODevicePtr takeDevice();
    void setDevice(const IODevicePtr &dp);

    void sendTcfTrkMessage(MessageType mt, Services service,
                           const char *command,
                           const char *commandParameters, int commandParametersLength,
                           const TcfTrkCallback &callBack = TcfTrkCallback(),
                           const QVariant &cookie = QVariant());

    void sendTcfTrkMessage(MessageType mt, Services service, const char *command,
                           const QByteArray &commandParameters,
                           const TcfTrkCallback &callBack = TcfTrkCallback(),
                           const QVariant &cookie = QVariant());

    // Convenience messages: Start a process
    void sendProcessStartCommand(const TcfTrkCallback &callBack,
                                 const QString &binary,
                                 unsigned uid,
                                 QStringList arguments = QStringList(),
                                 QString workingDirectory = QString(),
                                 bool debugControl = true,
                                 const QStringList &additionalLibraries = QStringList(),
                                 const QVariant &cookie = QVariant());

    // Preferred over Processes:Terminate by TCF TRK.
    void sendRunControlTerminateCommand(const TcfTrkCallback &callBack,
                                        const QByteArray &id,
                                        const QVariant &cookie = QVariant());

    void sendProcessTerminateCommand(const TcfTrkCallback &callBack,
                                     const QByteArray &id,
                                     const QVariant &cookie = QVariant());

    // Non-standard: Remove executable from settings.
    // Probably needs to be called after stopping. This command has no response.
    void sendSettingsRemoveExecutableCommand(const QString &binaryIn,
                                             unsigned uid,
                                             const QStringList &additionalLibraries = QStringList(),
                                             const QVariant &cookie = QVariant());

    void sendRunControlSuspendCommand(const TcfTrkCallback &callBack,
                                      const QByteArray &id,
                                      const QVariant &cookie = QVariant());

    // Resume / Step (see RunControlResumeMode).
    void sendRunControlResumeCommand(const TcfTrkCallback &callBack,
                                     const QByteArray &id,
                                     RunControlResumeMode mode,
                                     unsigned count /* = 1, currently ignored. */,
                                     quint64 rangeStart, quint64 rangeEnd,
                                     const QVariant &cookie = QVariant());

    // Convenience to resume a suspended process
    void sendRunControlResumeCommand(const TcfTrkCallback &callBack,
                                     const QByteArray &id,
                                     const QVariant &cookie = QVariant());

    void sendBreakpointsAddCommand(const TcfTrkCallback &callBack,
                                   const Breakpoint &b,
                                   const QVariant &cookie = QVariant());

    void sendBreakpointsRemoveCommand(const TcfTrkCallback &callBack,
                                      const QByteArray &id,
                                      const QVariant &cookie = QVariant());

    void sendBreakpointsRemoveCommand(const TcfTrkCallback &callBack,
                                      const QVector<QByteArray> &id,
                                      const QVariant &cookie = QVariant());

    void sendBreakpointsEnableCommand(const TcfTrkCallback &callBack,
                                      const QByteArray &id,
                                      bool enable,
                                      const QVariant &cookie = QVariant());

    void sendBreakpointsEnableCommand(const TcfTrkCallback &callBack,
                                      const QVector<QByteArray> &id,
                                      bool enable,
                                      const QVariant &cookie = QVariant());


    void sendMemoryGetCommand(const TcfTrkCallback &callBack,
                              const QByteArray &contextId,
                              quint64 start, quint64 size,
                              const QVariant &cookie = QVariant());

    void sendMemorySetCommand(const TcfTrkCallback &callBack,
                              const QByteArray &contextId,
                              quint64 start, const QByteArray& data,
                              const QVariant &cookie = QVariant());

    // Reply is an array of hexvalues
    void sendRegistersGetMCommand(const TcfTrkCallback &callBack,
                                  const QByteArray &contextId,
                                  const QVector<QByteArray> &ids,
                                  const QVariant &cookie = QVariant());

    // Convenience to get a range of register "R0" .. "R<n>".
    // Cookie will be an int containing "start".
    void sendRegistersGetMRangeCommand(const TcfTrkCallback &callBack,
                                 const QByteArray &contextId,
                                  unsigned start, unsigned count);

    // Set register
    void sendRegistersSetCommand(const TcfTrkCallback &callBack,
                                 const QByteArray &contextId,
                                 const QByteArray &ids,
                                 unsigned value,
                                 const QVariant &cookie = QVariant());
    // Set register
    void sendRegistersSetCommand(const TcfTrkCallback &callBack,
                                 const QByteArray &contextId,
                                 unsigned registerNumber,
                                 unsigned value,
                                 const QVariant &cookie = QVariant());

    static QByteArray parseMemoryGet(const TcfTrkCommandResult &r);

signals:
    void genericTcfEvent(int service, const QByteArray &name, const QVector<tcftrk::JsonValue> &value);
    void tcfEvent(const tcftrk::TcfTrkEvent &knownEvent);

    void logMessage(const QString &);
    void error(const QString &);

public slots:
    void setVerbose(unsigned v);

private slots:
    void slotDeviceError();
    void slotDeviceSocketStateChanged();
    void slotDeviceReadyRead();

private:
    bool checkOpen();
    void checkSendQueue();
    void writeMessage(QByteArray data);
    void emitLogMessage(const QString &);
    int parseMessage(const QByteArray &);
    int parseTcfCommandReply(char type, const QVector<QByteArray> &tokens);
    int parseTcfEvent(const QVector<QByteArray> &tokens);

    TcfTrkDevicePrivate *d;
};

} // namespace tcftrk

#endif // TCFTRKENGINE_H