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+/** @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 */
+