source: vbox/trunk/include/VBox/GuestHost/SharedClipboard-x11.h@ 96550

/** @file
 * Shared Clipboard - Common X11 code.
 */

/*
 * Copyright (C) 2006-2022 Oracle and/or its affiliates.
 *
 * This file is part of VirtualBox base platform packages, as
 * available from https://www.virtualbox.org.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation, in version 3 of the
 * License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <https://www.gnu.org/licenses>.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
 * in the VirtualBox distribution, in which case the provisions of the
 * CDDL are applicable instead of those of the GPL.
 *
 * You may elect to license modified versions of this file under the
 * terms and conditions of either the GPL or the CDDL or both.
 *
 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
 */

#ifndef VBOX_INCLUDED_GuestHost_SharedClipboard_x11_h
#define VBOX_INCLUDED_GuestHost_SharedClipboard_x11_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif

#include <X11/Intrinsic.h>

#include <iprt/thread.h>

#include <VBox/GuestHost/SharedClipboard.h>
#ifdef VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS
# include <VBox/GuestHost/SharedClipboard-transfers.h>
#endif

/**
 * The maximum number of simultaneous connections to shared clipboard service.
 * This constant limits amount of GUEST -> HOST connections to shared clipboard host service
 * for X11 host only. Once amount of connections reaches this number, all the
 * further attempts to CONNECT will be dropped on an early stage. Possibility to connect
 * is available again after one of existing connections is closed by DISCONNECT call.
 */
#define VBOX_SHARED_CLIPBOARD_X11_CONNECTIONS_MAX   (20)

/** Enables the Xt busy / update handling. */
#define VBOX_WITH_SHARED_CLIPBOARD_XT_BUSY      1

/**
 * Enumeration for all clipboard formats which we support on X11.
 */
typedef enum _SHCLX11FMT
{
    SHCLX11FMT_INVALID = 0,
    SHCLX11FMT_TARGETS,
    SHCLX11FMT_TEXT,  /* Treat this as UTF-8, but it may really be ascii */
    SHCLX11FMT_UTF8,
    SHCLX11FMT_BMP,
    SHCLX11FMT_HTML
#ifdef VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS
    , SHCLX11FMT_URI_LIST
#endif
} SHCLX11FMT;

/**
 * The table maps X11 names to data formats
 * and to the corresponding VBox clipboard formats.
 */
typedef struct SHCLX11FMTTABLE
{
    /** The X11 atom name of the format (several names can match one format). */
    const char     *pcszAtom;
    /** The format corresponding to the name. */
    SHCLX11FMT      enmFmtX11;
    /** The corresponding VBox clipboard format. */
    SHCLFORMAT      uFmtVBox;
} SHCLX11FMTTABLE;

#define NIL_CLIPX11FORMAT   0

/** Defines an index of the X11 clipboad format table. */
typedef unsigned SHCLX11FMTIDX;

/**
 * Structure for maintaining a Shared Clipboard context on X11 platforms.
 */
typedef struct _SHCLX11CTX
{
    /** Opaque data structure describing the front-end. */
    PSHCLCONTEXT     pFrontend;
    /** Our callback table to use. */
    SHCLCALLBACKS    Callbacks;
    /** Is an X server actually available? */
    bool             fHaveX11;
    /** The X Toolkit application context structure. */
    XtAppContext     pAppContext;
    /** We have a separate thread to wait for window and clipboard events. */
    RTTHREAD         Thread;
    /** Flag indicating that the thread is in a started state. */
    bool             fThreadStarted;
    /** The X Toolkit widget which we use as our clipboard client.  It is never made visible. */
    Widget           pWidget;
    /** Should we try to grab the clipboard on startup? */
    bool             fGrabClipboardOnStart;
    /** The best text format X11 has to offer, as an index into the formats table. */
    SHCLX11FMTIDX    idxFmtText;
    /** The best bitmap format X11 has to offer, as an index into the formats table. */
    SHCLX11FMTIDX    idxFmtBmp;
    /** The best HTML format X11 has to offer, as an index into the formats table. */
    SHCLX11FMTIDX    idxFmtHTML;
#ifdef VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS
    /** The best HTML format X11 has to offer, as an index into the formats table. */
    SHCLX11FMTIDX    idxFmtURI;
# ifdef VBOX_WITH_SHARED_CLIPBOARD_TRANSFERS_HTTP
    /** HTTP transfer context data. */
    SHCLHTTPCONTEXT  HttpCtx;
# endif
#endif
    /** What kind of formats does VBox have to offer? */
    SHCLFORMATS      vboxFormats;
    /** Cache of the last unicode data that we received. */
    void            *pvUnicodeCache;
    /** Size of the unicode data in the cache. */
    uint32_t         cbUnicodeCache;
    /** When we wish the clipboard to exit, we have to wake up the event
     * loop.  We do this by writing into a pipe.  This end of the pipe is
     * the end that another thread can write to. */
    int              wakeupPipeWrite;
    /** The reader end of the pipe. */
    int              wakeupPipeRead;
    /** A pointer to the XFixesSelectSelectionInput function. */
    void (*fixesSelectInput)(Display *, Window, Atom, unsigned long);
    /** The first XFixes event number. */
    int              fixesEventBase;
#ifdef VBOX_WITH_SHARED_CLIPBOARD_XT_BUSY
    /** XtGetSelectionValue on some versions of libXt isn't re-entrant
     * so block overlapping requests on this flag. */
    bool             fXtBusy;
    /** If a request is blocked on the previous flag, set this flag to request
     * an update later - the first callback should check and clear this flag
     * before processing the callback event. */
    bool             fXtNeedsUpdate;
#endif
} SHCLX11CTX, *PSHCLX11CTX;

/**
 * Structure for keeping a X11 read data request.
 */
typedef struct _SHCLX11READDATAREQ
{
    /** Actual read request to handle. */
    CLIPREADCBREQ *pReq;
    /** Result code of the operation on completion. */
    int            rcCompletion;
} SHCLX11READDATAREQ;
/** Pointer to a send data request. */
typedef SHCLX11READDATAREQ *PSHCLX11READDATAREQ;

/** @name Shared Clipboard APIs for X11.
 * @{
 */
int ShClX11Init(PSHCLX11CTX pCtx, PSHCLCALLBACKS pCallbacks, PSHCLCONTEXT pParent, bool fHeadless);
void ShClX11Destroy(PSHCLX11CTX pCtx);
int ShClX11ThreadStart(PSHCLX11CTX pCtx, bool grab);
int ShClX11ThreadStartEx(PSHCLX11CTX pCtx, const char *pszName, bool fGrab);
int ShClX11ThreadStop(PSHCLX11CTX pCtx);
int ShClX11ReportFormatsToX11(PSHCLX11CTX pCtx, SHCLFORMATS vboxFormats);
int ShClX11ReadDataFromX11(PSHCLX11CTX pCtx, SHCLFORMATS vboxFormat, CLIPREADCBREQ *pReq);
void ShClX11SetCallbacks(PSHCLX11CTX pCtx, PSHCLCALLBACKS pCallbacks);
/** @} */

#endif /* !VBOX_INCLUDED_GuestHost_SharedClipboard_x11_h */