fserve.c

远程桌面连接工具

/* $TOG: fserve.c /main/49 1997/06/10 11:23:56 barstow $ */
/*

Copyright (c) 1990  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.

*/
/* $XFree86: xc/lib/font/fc/fserve.c,v 3.4.2.2 1997/06/11 12:08:41 dawes Exp $ */

/*
 * Copyright 1990 Network Computing Devices
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the names of Network Computing Devices, or Digital
 * not be used in advertising or publicity pertaining to distribution
 * of the software without specific, written prior permission.
 *
 * NETWORK COMPUTING DEVICES, AND DIGITAL AND DISCLAIM ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NETWORK COMPUTING DEVICES,
 * OR DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
 * THIS SOFTWARE.
 *
 * Author:  	Dave Lemke, Network Computing Devices, Inc
 */
/*
 * font server specific font access
 */

#ifdef WIN32
#define _WILLWINSOCK_
#endif
#include	<X11/X.h>
#include	<X11/Xos.h>
#include	"X11/Xpoll.h"
#include	"FS.h"
#include	"FSproto.h"
#include	"fontmisc.h"
#include	"fontstruct.h"
#include	"fservestr.h"
#include	<errno.h>
#if defined(X_NOT_STDC_ENV) && !defined(__EMX__)
extern int errno;
#define Time_t long
extern Time_t time ();
#else
#include	<time.h>
#define Time_t time_t
#endif

#ifdef NCD
#include	<ncd/nvram.h>
#endif

#ifndef NULL
#define NULL 0
#endif

#ifndef MIN
#define MIN(a,b)    ((a)<(b)?(a):(b))
#endif

#define NONZEROMETRICS(pci) ((pci)->leftSideBearing || \
			     (pci)->rightSideBearing || \
			     (pci)->ascent || \
			     (pci)->descent || \
			     (pci)->characterWidth)


extern FontPtr find_old_font();

extern int  _fs_build_range();

static int  fs_read_glyphs();
static int  fs_read_list();
static int  fs_read_list_info();

static int  fs_font_type;
extern fd_set _fs_fd_mask;

static void fs_block_handler();
static int  fs_wakeup();

static FSFpePtr awaiting_reconnect;

void        _fs_connection_died();
static int  _fs_restart_connection();
static void _fs_try_reconnect();
static int  fs_send_query_info();
static int  fs_send_query_extents();
static int  fs_send_query_bitmaps();
static int  fs_send_close_font();
static void fs_client_died();
static void _fs_client_access();
static void _fs_client_resolution();

char _fs_glyph_undefined;
char _fs_glyph_requested;
char _fs_glyph_zero_length;

/*
 * Font server access
 *
 * the basic idea for the non-blocking access is to have the function
 * called multiple times until the actual data is returned, instead
 * of ClientBlocked.
 *
 * the first call to the function will cause the request to be sent to
 * the font server, and a block record to be stored in the fpe's list
 * of outstanding requests.  the FS block handler also sticks the
 * proper set of fd's into the select mask.  when data is ready to be
 * read in, the FS wakup handler will be hit.  this will read the
 * data off the wire into the proper block record, and then signal the
 * client that caused the block so that it can restart.  it will then
 * call the access function again, which will realize that the data has
 * arrived and return it.
 */


/* XXX this should probably be a macro once its fully debugged */
/* ARGSUSED */
static void
_fs_add_req_log(conn, opcode)
    FSFpePtr    conn;
    int         opcode;
{

#ifdef DEBUG
    conn->reqbuffer[conn->reqindex++] = opcode;
    if (conn->reqindex == REQUEST_LOG_SIZE)
	conn->reqindex = 0;
#endif

    conn->current_seq++;
}

static Bool
fs_name_check(name)
    char       *name;
{
#ifdef __EMX__
    /* OS/2 uses D:/XFree86/.... as fontfile pathnames, so check that
     * there is not only a protocol/ prefix, but also that the first chars
     * are not a drive letter
     */
    if (name && isalpha(*name) && name[1] == ':')
      return FALSE;
#endif
    /* Just make sure there is a protocol/ prefix */
    return (name && *name != '/' && strchr(name, '/'));
}

static void
_fs_client_resolution(conn)
    FSFpePtr    conn;
{
    fsSetResolutionReq srreq;
    int         num_res;
    FontResolutionPtr res;

    res = GetClientResolutions(&num_res);

    if (num_res) {
	srreq.reqType = FS_SetResolution;
	srreq.num_resolutions = num_res;
	srreq.length = (SIZEOF(fsSetResolutionReq) +
			(num_res * SIZEOF(fsResolution)) + 3) >> 2;

	_fs_add_req_log(conn, FS_SetResolution);
	if (_fs_write(conn, (char *) &srreq, SIZEOF(fsSetResolutionReq)) != -1)
	    (void)_fs_write_pad(conn, (char *) res,
				(num_res * SIZEOF(fsResolution)));
    }
}

/*
 * sends the stuff that's meaningful to a newly opened or reset FS
 */
static int
fs_send_init_packets(conn)
    FSFpePtr    conn;
{
    fsSetResolutionReq srreq;
    fsSetCataloguesReq screq;
    fsListCataloguesReq lcreq;
    fsListCataloguesReply lcreply;
    int         num_cats,
                clen,
                len;
    char       *client_cat = (char *) 0,
               *cp,
               *sp,
               *end;
    int         num_res;
    FontResolutionPtr res;
    int         err = Successful;

#define	CATALOGUE_SEP	'+'

    res = GetClientResolutions(&num_res);
    if (num_res) {
	srreq.reqType = FS_SetResolution;
	srreq.num_resolutions = num_res;
	srreq.length = (SIZEOF(fsSetResolutionReq) +
			(num_res * SIZEOF(fsResolution)) + 3) >> 2;

	_fs_add_req_log(conn, FS_SetResolution);
	if (_fs_write(conn, (char *) &srreq, SIZEOF(fsSetResolutionReq)) == -1)
	{
	    err = BadFontPath;
	    goto fail;
	}
	if (_fs_write_pad(conn, (char *) res, (num_res * SIZEOF(fsResolution))) == -1)
	{
	    err = BadFontPath;
	    goto fail;
	}
    }
    sp = strrchr(conn->servername, '/');

    /* don't get tricked by a non-existant catalogue list */
    if (sp == strchr(conn->servername, '/')) {
	/*
	 * try original name -- this might be an alternate with no catalogues
	 */
	sp = strrchr(conn->requestedname, '/');
	if (sp == strchr(conn->requestedname, '/'))
		sp = (char *) 0;
    }
    if (sp) {			/* turn cats into counted list */
	sp++;
	/* allocate more than enough room */
	cp = client_cat = (char *) xalloc(strlen(conn->servername));
	if (!cp) {
	    err = BadAlloc;
	    goto fail;
	}
	num_cats = 0;
	while (*sp) {
	    end = strchr(sp, CATALOGUE_SEP);
	    if (!end)
		end = sp + strlen(sp);
	    *cp++ = len = end - sp;
	    num_cats++;
	    memmove(cp, sp, len);
	    sp += len;
	    if (*sp == CATALOGUE_SEP)
		sp++;
	    cp += len;
	}
	clen = cp - client_cat;
	/* our list checked out, so send it */
	screq.reqType = FS_SetCatalogues;
	screq.num_catalogues = num_cats;
	screq.length = (SIZEOF(fsSetCataloguesReq) + clen + 3) >> 2;

	_fs_add_req_log(conn, FS_SetCatalogues);
	if (_fs_write(conn, (char *) &screq, SIZEOF(fsSetCataloguesReq)) == -1)
	{
	    err = BadFontPath;
	    goto fail;
	}
	if (_fs_write_pad(conn, (char *) client_cat, clen) == -1)
	{
	    err = BadFontPath;
	    goto fail;
	}

	/*
	 * now sync up with the font server, to see if an error was generated
	 * by a bogus catalogue
	 */
	lcreq.reqType = FS_ListCatalogues;
	lcreq.length = (SIZEOF(fsListCataloguesReq)) >> 2;
	lcreq.maxNames = 0;
	lcreq.nbytes = 0;
	_fs_add_req_log(conn, FS_SetCatalogues);
	if (_fs_write(conn, (char *) &lcreq, SIZEOF(fsListCataloguesReq)) == -1)
	{
	    err = BadFontPath;
	    goto fail;
	}

	/*
	 * next bit will either by the ListCats reply, or an error followed by
	 * the reply
	 */
	if (_fs_read(conn, (char *) &lcreply, SIZEOF(fsGenericReply)) == -1) {
	    err = BadFontPath;
	    goto fail;
	}
	if (lcreply.type == FS_Error &&
		((fsError *) & lcreply)->major_opcode == FS_SetCatalogues) {
	    _fs_eat_rest_of_error(conn, (fsError *) & lcreply);
	    /* get ListCats response */
	    (void) _fs_read(conn, (char *) &lcreply,
			    SIZEOF(fsListCataloguesReply));
	    err = BadFontPath;
	    goto fail;
	}
	/* must be reply, swallow the rest of it */
	_fs_eat_rest_of_error(conn, (fsError *) & lcreply);
    }
fail:
    xfree(client_cat);
    return err;
}

/* 
 * close font server and remove any state associated with
 * this connection - this includes any client records.
 */

static void
fs_close_conn(conn)
    FSFpePtr	conn;
{
    FSClientPtr	client, nclient;

    /* XXX - hack.  The right fix is to remember that the font server
       has gone away when we first discovered it. */
    if (conn->trans_conn)
        (void) _FontTransClose (conn->trans_conn);

    if (conn->fs_fd != -1)
        FD_CLR(conn->fs_fd, &_fs_fd_mask);

    for (client = conn->clients; client; client = nclient) 
    {
	nclient = client->next;
	xfree (client);
    }
    conn->clients = NULL;
}

/*
 * the wakeup handlers have to be set when the FPE is open, and not
 * removed until it is freed, in order to handle unexpected data, like
 * events
 */
/* ARGSUSED */
static int
fs_init_fpe(fpe)
    FontPathElementPtr fpe;
{
    FSFpePtr    conn;
    char       *name;
    int         err;

    /* open font server */
    /* create FS specific fpe info */
    errno = 0;

    name = fpe->name;

    /* hack for old style names */
    if (*name == ':')
	name++;			/* skip ':' */

    conn = _fs_open_server(name);
    if (conn) {
	conn->requestedname = fpe->name; /* stash this for later init use */
	fpe->private = (pointer) conn;
	err = fs_send_init_packets(conn);
	if (err != Successful) {
	    fs_close_conn(conn);
    	    xfree(conn->servername);
    	    xfree(conn->alts);
    	    xfree(conn);
	    return err;
	}
	if (init_fs_handlers(fpe, fs_block_handler) != Successful)
	    return AllocError;
	FD_SET(conn->fs_fd, &_fs_fd_mask);
	conn->attemptReconnect = TRUE;

#ifdef NCD
	if (configData.ExtendedFontDiags)
	    printf("Connected to font server \"%s\"\n", name);
#endif

	return err;
    }

#ifdef DEBUG
    fprintf(stderr, "failed to connect to FS \"%s\"\n", name);
#endif

#ifdef NCD
    if (configData.ExtendedFontDiags)
	printf("Failed to connect to font server \"%s\"\n", name);
#endif

    return (errno == ENOMEM) ? AllocError : BadFontPath;
}

static int
fs_reset_fpe(fpe)
    FontPathElementPtr fpe;
{
    (void) fs_send_init_packets((FSFpePtr) fpe->private);
    return Successful;
}

/*
 * this shouldn't be called till all refs to the FPE are gone
 */

static int
fs_free_fpe(fpe)
    FontPathElementPtr fpe;
{
    FSFpePtr    conn = (FSFpePtr) fpe->private;
    FSFpePtr    recon,
               *prev;
    prev = &awaiting_reconnect;
    while (*prev) {
	recon = *prev;
	if (conn == recon) {
	    *prev = recon->next_reconnect;
	    break;
	}
	prev = &recon->next_reconnect;
    }

    fs_close_conn(conn);

    remove_fs_handlers(fpe, fs_block_handler,
		       !XFD_ANYSET(&_fs_fd_mask) && !awaiting_reconnect);

    xfree(conn->alts);
    xfree(conn->servername);
    xfree(conn);
    fpe->private = (pointer) 0;

#ifdef NCD
    if (configData.ExtendedFontDiags)
	printf("Disconnected from font server \"%s\"\n", fpe->name);
#endif

    return Successful;
}

static      FSBlockDataPtr
fs_new_block_rec(fpe, client, type)
    FontPathElementPtr fpe;
    pointer     client;
    int         type;
{
    FSBlockDataPtr blockrec,
                br;
    FSFpePtr    fsfpe = (FSFpePtr) fpe->private;
    int         size;

    blockrec = (FSBlockDataPtr) xalloc(sizeof(FSBlockDataRec));
    if (!blockrec)
	return (FSBlockDataPtr) 0;