Sweden-Number/server/clipboard.c

402 lines
12 KiB
C

/*
* Server-side clipboard management
*
* Copyright (C) 2002 Ulrich Czekalla
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "request.h"
#include "object.h"
#include "file.h"
#include "process.h"
#include "user.h"
#include "winuser.h"
#include "winternl.h"
struct clipboard
{
struct object obj; /* object header */
struct thread *open_thread; /* thread id that has clipboard open */
user_handle_t open_win; /* window that has clipboard open */
struct thread *owner_thread; /* thread id that owns the clipboard */
user_handle_t owner_win; /* window that owns the clipboard data */
user_handle_t viewer; /* first window in clipboard viewer list */
unsigned int seqno; /* clipboard change sequence number */
unsigned int open_seqno; /* sequence number at open time */
timeout_t seqno_timestamp; /* time stamp of last seqno increment */
unsigned int listen_size; /* size of listeners array */
unsigned int listen_count; /* count of listeners */
user_handle_t *listeners; /* array of listener windows */
};
static void clipboard_dump( struct object *obj, int verbose );
static void clipboard_destroy( struct object *obj );
static const struct object_ops clipboard_ops =
{
sizeof(struct clipboard), /* size */
clipboard_dump, /* dump */
no_get_type, /* get_type */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
no_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
no_link_name, /* link_name */
NULL, /* unlink_name */
no_open_file, /* open_file */
no_close_handle, /* close_handle */
clipboard_destroy /* destroy */
};
#define MINUPDATELAPSE (2 * TICKS_PER_SEC)
/* dump a clipboard object */
static void clipboard_dump( struct object *obj, int verbose )
{
struct clipboard *clipboard = (struct clipboard *)obj;
fprintf( stderr, "Clipboard open_thread=%p open_win=%08x owner_thread=%p owner_win=%08x viewer=%08x seq=%u\n",
clipboard->open_thread, clipboard->open_win, clipboard->owner_thread,
clipboard->owner_win, clipboard->viewer, clipboard->seqno );
}
static void clipboard_destroy( struct object *obj )
{
struct clipboard *clipboard = (struct clipboard *)obj;
free( clipboard->listeners );
}
/* retrieve the clipboard info for the current process, allocating it if needed */
static struct clipboard *get_process_clipboard(void)
{
struct clipboard *clipboard;
struct winstation *winstation = get_process_winstation( current->process, WINSTA_ACCESSCLIPBOARD );
if (!winstation) return NULL;
if (!(clipboard = winstation->clipboard))
{
if ((clipboard = alloc_object( &clipboard_ops )))
{
clipboard->open_thread = NULL;
clipboard->open_win = 0;
clipboard->owner_thread = NULL;
clipboard->owner_win = 0;
clipboard->viewer = 0;
clipboard->seqno = 0;
clipboard->seqno_timestamp = 0;
clipboard->listen_size = 0;
clipboard->listen_count = 0;
clipboard->listeners = NULL;
winstation->clipboard = clipboard;
}
}
release_object( winstation );
return clipboard;
}
/* add a clipboard listener */
static void add_listener( struct clipboard *clipboard, user_handle_t window )
{
unsigned int i;
for (i = 0; i < clipboard->listen_count; i++)
{
if (clipboard->listeners[i] != window) continue;
set_error( STATUS_INVALID_PARAMETER ); /* already set */
return;
}
if (clipboard->listen_size == clipboard->listen_count)
{
unsigned int new_size = max( 8, clipboard->listen_size * 2 );
user_handle_t *new = realloc( clipboard->listeners, new_size * sizeof(*new) );
if (!new)
{
set_error( STATUS_NO_MEMORY );
return;
}
clipboard->listeners = new;
clipboard->listen_size = new_size;
}
clipboard->listeners[clipboard->listen_count++] = window;
}
/* remove a clipboard listener */
static int remove_listener( struct clipboard *clipboard, user_handle_t window )
{
unsigned int i;
for (i = 0; i < clipboard->listen_count; i++)
{
if (clipboard->listeners[i] != window) continue;
memmove( clipboard->listeners + i, clipboard->listeners + i + 1,
(clipboard->listen_count - i - 1) * sizeof(*clipboard->listeners) );
clipboard->listen_count--;
return 1;
}
return 0;
}
/* close the clipboard, and return the viewer window that should be notified if any */
static user_handle_t close_clipboard( struct clipboard *clipboard )
{
unsigned int i;
clipboard->open_win = 0;
clipboard->open_thread = NULL;
if (clipboard->seqno == clipboard->open_seqno) return 0; /* unchanged */
for (i = 0; i < clipboard->listen_count; i++)
post_message( clipboard->listeners[i], WM_CLIPBOARDUPDATE, 0, 0 );
return clipboard->viewer;
}
/* cleanup clipboard information upon window destruction */
void cleanup_clipboard_window( struct desktop *desktop, user_handle_t window )
{
struct clipboard *clipboard = desktop->winstation->clipboard;
if (!clipboard) return;
remove_listener( clipboard, window );
if (clipboard->viewer == window) clipboard->viewer = 0;
if (clipboard->owner_win == window)
{
clipboard->owner_win = 0;
clipboard->owner_thread = NULL;
}
if (clipboard->open_win == window)
{
user_handle_t viewer = close_clipboard( clipboard );
if (viewer) send_notify_message( viewer, WM_DRAWCLIPBOARD, clipboard->owner_win, 0 );
}
}
/* Called when thread terminates to allow release of clipboard */
void cleanup_clipboard_thread(struct thread *thread)
{
struct clipboard *clipboard;
struct winstation *winstation;
if (!thread->process->winstation) return;
if (!(winstation = get_process_winstation( thread->process, WINSTA_ACCESSCLIPBOARD ))) return;
if ((clipboard = winstation->clipboard))
{
if (thread == clipboard->owner_thread)
{
clipboard->owner_win = 0;
clipboard->owner_thread = NULL;
}
if (thread == clipboard->open_thread)
{
user_handle_t viewer = close_clipboard( clipboard );
if (viewer) send_notify_message( viewer, WM_DRAWCLIPBOARD, clipboard->owner_win, 0 );
}
}
release_object( winstation );
}
static int release_clipboard_owner( struct clipboard *clipboard, user_handle_t win )
{
if ((clipboard->open_thread && clipboard->open_thread->process != current->process) ||
(win && clipboard->owner_win != get_user_full_handle( win )))
{
set_win32_error( ERROR_CLIPBOARD_NOT_OPEN );
return 0;
}
clipboard->owner_win = 0;
clipboard->owner_thread = NULL;
return 1;
}
static int get_seqno( struct clipboard *clipboard )
{
if (!clipboard->owner_thread && (current_time - clipboard->seqno_timestamp > MINUPDATELAPSE))
{
clipboard->seqno_timestamp = current_time;
clipboard->seqno++;
}
return clipboard->seqno;
}
/* open the clipboard */
DECL_HANDLER(open_clipboard)
{
struct clipboard *clipboard = get_process_clipboard();
user_handle_t win = 0;
if (!clipboard) return;
if (req->window && !(win = get_valid_window_handle( req->window ))) return;
if (clipboard->open_thread && clipboard->open_win != win)
{
set_error( STATUS_INVALID_LOCK_SEQUENCE );
return;
}
if (!clipboard->open_thread) clipboard->open_seqno = clipboard->seqno; /* first open */
clipboard->open_win = win;
clipboard->open_thread = current;
reply->owner = (clipboard->owner_thread && clipboard->owner_thread->process == current->process);
}
/* close the clipboard */
DECL_HANDLER(close_clipboard)
{
struct clipboard *clipboard = get_process_clipboard();
if (!clipboard) return;
if (clipboard->open_thread != current)
{
set_win32_error( ERROR_CLIPBOARD_NOT_OPEN );
return;
}
if (req->changed) clipboard->seqno++;
reply->viewer = close_clipboard( clipboard );
reply->owner = (clipboard->owner_thread && clipboard->owner_thread->process == current->process);
}
DECL_HANDLER(set_clipboard_info)
{
struct clipboard *clipboard = get_process_clipboard();
if (!clipboard) return;
reply->old_clipboard = clipboard->open_win;
reply->old_owner = clipboard->owner_win;
reply->old_viewer = clipboard->viewer;
if (req->flags & SET_CB_RELOWNER)
{
if (!release_clipboard_owner( clipboard, req->owner )) return;
}
if (req->flags & SET_CB_SEQNO) clipboard->seqno++;
reply->seqno = get_seqno( clipboard );
if (clipboard->open_thread) reply->flags |= CB_OPEN_ANY;
if (clipboard->open_thread == current) reply->flags |= CB_OPEN;
if (clipboard->owner_thread == current) reply->flags |= CB_OWNER;
if (clipboard->owner_thread && clipboard->owner_thread->process == current->process)
reply->flags |= CB_PROCESS;
}
/* empty the clipboard and grab ownership */
DECL_HANDLER(empty_clipboard)
{
struct clipboard *clipboard = get_process_clipboard();
if (!clipboard) return;
if (clipboard->open_thread != current)
{
set_win32_error( ERROR_CLIPBOARD_NOT_OPEN );
return;
}
clipboard->owner_win = clipboard->open_win;
clipboard->owner_thread = clipboard->open_thread;
clipboard->seqno++;
}
/* Get clipboard information */
DECL_HANDLER(get_clipboard_info)
{
struct clipboard *clipboard = get_process_clipboard();
if (!clipboard) return;
reply->window = clipboard->open_win;
reply->owner = clipboard->owner_win;
reply->viewer = clipboard->viewer;
reply->seqno = get_seqno( clipboard );
}
/* set the clipboard viewer window */
DECL_HANDLER(set_clipboard_viewer)
{
struct clipboard *clipboard = get_process_clipboard();
user_handle_t viewer = 0, previous = 0;
if (!clipboard) return;
if (req->viewer && !(viewer = get_valid_window_handle( req->viewer ))) return;
if (req->previous && !(previous = get_valid_window_handle( req->previous ))) return;
reply->old_viewer = clipboard->viewer;
reply->owner = clipboard->owner_win;
if (!previous || clipboard->viewer == previous)
clipboard->viewer = viewer;
else
set_error( STATUS_PENDING ); /* need to send message instead */
}
/* add a clipboard listener window */
DECL_HANDLER(add_clipboard_listener)
{
struct clipboard *clipboard = get_process_clipboard();
user_handle_t win;
if (!clipboard) return;
if (!(win = get_valid_window_handle( req->window ))) return;
add_listener( clipboard, win );
}
/* remove a clipboard listener window */
DECL_HANDLER(remove_clipboard_listener)
{
struct clipboard *clipboard = get_process_clipboard();
user_handle_t win;
if (!clipboard) return;
if (!(win = get_valid_window_handle( req->window ))) return;
if (!remove_listener( clipboard, win )) set_error( STATUS_INVALID_PARAMETER );
}