server/socket/image.C

/*
 * CrossFire, A Multiplayer game
 *
 * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
 * Copyright (C) 2001 Mark Wedel
 * Copyright (C) 1992 Frank Tore Johansen
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * The author can be reached via e-mail to <crossfire@schmorp.de>
 */

/** \file
 * Image related communication
 *
 *  \date 2003-12-02
 *
 * This file deals with the image related communication to the
 * client.  I've located all the functions in this file - this
 * localizes it more, and means that we don't need to declare
 * things like all the structures as globals.
 */

#include <global.h>
#include <sproto.h>

#include "crc.h"

#define MAX_FACE_SETS   20  /**< Maximum number of image sets the program will handle */

/** Information about one image */
typedef struct FaceInfo
{
  uint8 *data;              /**< image data */
  uint16 datalen;           /**< length of the xpm data */
  uint32 checksum;          /**< Checksum of face data */
} FaceInfo;

/** Information about one face set */
typedef struct
{
  char *prefix;         /**< */
  char *fullname;

  uint8 fallback;       /**< faceset to use when an image is not found in this faceset */
  char *size;
  char *extension;
  char *comment;

  FaceInfo *faces;      /**< images in this faceset */
} FaceSets;

static FaceSets facesets[MAX_FACE_SETS];    /**< All facesets */

/**
 * Checks specified faceset is valid
 * \param fsn faceset number
 */
int
is_valid_faceset (int fsn)
{
  if (fsn >= 0 && fsn < MAX_FACE_SETS && facesets[fsn].prefix)
    return TRUE;
  return FALSE;
}

/**
 * Frees all faceset information
 */
void
free_socket_images (void)
{
  int num, q;

  for (num = 0; num < MAX_FACE_SETS; num++)
    {
      if (facesets[num].prefix)
        {
          for (q = 0; q < faces.size (); q++)
            if (facesets[num].faces[q].data)
              free (facesets[num].faces[q].data);

          free (facesets[num].prefix);
          free (facesets[num].fullname);
          free (facesets[num].size);
          free (facesets[num].extension);
          free (facesets[num].comment);
          free (facesets[num].faces);
        }
    }
}

/**
 * This returns the set we will actually use when sending
 * a face.  This is used because the image files may be sparse.
 * This function is recursive.  imageno is the face number we are
 * trying to send
 *
 * If face is not found in specified faceset, tries with 'fallback' faceset.
 *
 * \param faceset faceset to check
 * \param imageno image number
 *
 */
static int
get_face_fallback (int faceset, int imageno)
{
  /* faceset 0 is supposed to have every image, so just return.  Doing
   * so also prevents infinite loops in the case if it not having
   * the face, but in that case, we are likely to crash when we try
   * to access the data, but that is probably preferable to an infinite
   * loop.
   */
  if (faceset == 0)
    return 0;

  if (!facesets[faceset].prefix)
    {
      LOG (llevError, "get_face_fallback called with unused set (%d)?\n", faceset);
      return 0;                 /* use default set */
    }

  if (facesets[faceset].faces[imageno].data)
    return faceset;

  return get_face_fallback (facesets[faceset].fallback, imageno);
}

/**
 * Checks fallback are correctly defined.
 * This is a simple recursive function that makes sure the fallbacks
 * are all proper (eg, the fall back to defined sets, and also
 * eventually fall back to 0).  At the top level, togo is set to MAX_FACE_SETS,
 * if togo gets to zero, it means we have a loop.
 * This is only run when we first load the facesets.
 */
static void
check_faceset_fallback (int faceset, int togo)
{
  int fallback = facesets[faceset].fallback;

  /* proper case - falls back to base set */
  if (fallback == 0)
    return;

  if (!facesets[fallback].prefix)
    {
      LOG (llevError, "Face set %d falls to non set faceset %d\n", faceset, fallback);
      abort ();
    }

  togo--;
  if (togo == 0)
    {
      LOG (llevError, "Infinite loop found in facesets. aborting.\n");
      abort ();
    }

  check_faceset_fallback (fallback, togo);
}

#define MAX_IMAGE_SIZE 10000

/**
 * Client tells us what type of faces it wants.  Also sets
 * the caching attribute.
 *
 */
void
SetFaceMode (char *buf, int len, client *ns)
{
  int mask = (atoi (buf) & CF_FACE_CACHE), mode = (atoi (buf) & ~CF_FACE_CACHE);

  if (mode == CF_FACE_NONE)
    ns->facecache = 1;
  else if (mode != CF_FACE_PNG)
    ns->send_packet_printf ("drawinfo %d %s", NDI_RED, "Warning - send unsupported face mode.  Will use Png");

  if (mask)
    ns->facecache = 1;
}

/**
 * Client has requested pixmap that it somehow missed getting.
 * This will be called often if the client is
 * caching images.
 */
void
SendFaceCmd (char *buf, int len, client *ns)
{
  uint16 facenum = atoi (buf);

  if (facenum != 0)
    esrv_send_face (ns, facenum, 1);
}

// how lame
static void print_facename (packet &sl, const facedata &d)
{
  for (int i = 0; i < CHKSUM_SIZE; ++i)
    sl.printf ("%02x", d.chksum [i]);
}

// gcfclient uses the server-provided checksum for comparison,
// but always wrotes a broken checksum to its cache file, so we
// have to provide gcfclient with a useless checksum just to
// have to cache the image despite its bugs.
static uint32 gcfclient_checksum (const facedata *d)
{
  uint32 csum = 0;

  for (std::string::const_iterator i = d->data.begin ();
       i != d->data.end ();
       ++i)
    {
      csum = rotate_right (csum);
      csum += *(uint8 *)&*i;
    }

  return csum;
}

/**
 * Sends a face to a client if they are in pixmap mode
 * nothing gets sent in bitmap mode. 
 * If nocache is true (nonzero), ignore the cache setting from the client -
 * this is needed for the askface, in which we really do want to send the
 * face (and askface is the only place that should be setting it).  Otherwise,
 * we look at the facecache, and if set, send the image name.
 */
void
esrv_send_face (client *ns, short face_num, int nocache)
{
  if (face_num <= 0 || face_num >= faces.size ())
    {
      LOG (llevError, "esrv_send_face (%d) out of bounds??\n", face_num);
      return;
    }

  const facedata *d = face_data (face_num, ns->faceset);

  packet sl;

  if (ns->facecache && !nocache)
    {
      if (ns->force_face0)
        sl << "face " << uint16 (face_num);
      else if (ns->image2)
        sl << "face2 " << uint16 (face_num) << uint8 (0) << uint32 (ns->force_bad_checksum ? gcfclient_checksum (d) : 0);
      else
        sl << "face1 " << uint16 (face_num) << uint32 (ns->force_bad_checksum ? gcfclient_checksum (d) : 0);

      // how lame
      print_facename (sl, *d);

      ns->send_packet (sl);
    }
  else
    {
      fprintf (stderr, "image %s %d\n", &faces [face_num].name, nocache);//D
      sl << (ns->image2 ? "image2 " : "image ")
         << uint32 (face_num);

      if (ns->image2)
        sl << uint8 (0);

      sl << uint32 (d->data.size ())
         << data (d->data.data (), d->data.size ());

      ns->send_packet (sl);
    }

  ns->faces_sent[face_num] |= NS_FACESENT_FACE;
}

/**
 * Sends the number of images, checksum of the face file,
 * and the image_info file information.  See the doc/Developers/protocol
 * if you want further detail.
 */

void
send_image_info (client *ns, char *params)
{
  packet sl;

  //TODO: second parameter is a checksum, but it makes no sense in this current framework
  sl.printf ("replyinfo image_info\n%d\n%u\n", MAX_FACES, 0);

  sl << "0:base:standard:0:32x32:none:The old 32x32 faceset.\n";

  ns->send_packet (sl);
}

/**
 * Sends requested face information.
 * \param ns socket to send to
 * \param params contains first and last index of face
 *
 * For each image in [start..stop] sends
 *  - checksum
 *  - name
 */
void
send_image_sums (client *ns, char *params)
{
  int start, stop;
  char *cp;

  packet sl;

  start = atoi (params);
  for (cp = params; *cp != '\0'; cp++)
    if (*cp == ' ')
      break;

  stop = atoi (cp);
  if (stop < start || *cp == '\0' || (stop - start) > 1000 || stop >= MAX_FACES)
    {
      sl.printf ("replyinfo image_sums %d %d", start, stop);
      ns->send_packet (sl);
      sl.reset ();
      return;
    }

  sl.printf ("replyinfo image_sums %d %d ", start, stop);

  for (int i = start; i <= stop && i < faces.size (); i++)
    {
      ns->faces_sent[i] |= NS_FACESENT_FACE;

      const facedata *d = face_data (i, ns->faceset);

      if (sl.room () < 2 + 4 + 1 + d->data.size () + 1)
        break;

      sl << uint16 (i)
         << uint32 (0) // checksum
         << uint8  (ns->faceset);

      print_facename (sl, *d); sl << uint8 (0);
    }

  /* It would make more sense to catch this pre-emptively in the code above.
   * however, if this really happens, we probably just want to cut down the
   * size to less than 1000, since that is what we claim the protocol would
   * support.
   */
  //TODO: taken care of above, should simply abort or make sure the above code is correct
  if (sl.length () >= MAXSOCKBUF)
    {
      LOG (llevError, "send_image_send: buffer overrun, %d > %d\n", sl.length (), MAXSOCKBUF);
      abort ();
    }

  ns->send_packet (sl);
}

Revision:	1.26
Committed:	Mon Mar 12 23:45:10 2007 UTC (17 years, 3 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.25:	+26 -7 lines
Log Message:	- gcfclient compares against the server-provided image checksum but stores its own checksum in the database. needless to say, they differed. needless to say, we now have to provide a dummy superfluous gcfclient checksum for gcfclient only. - add various bug workaround flags to enbale gcfclient to cache imges again.
#	User	Rev	Content
1	elmex	1.1	/*
2	root	1.17	* CrossFire, A Multiplayer game
3			*
4			* Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
5			* Copyright (C) 2001 Mark Wedel
6			* Copyright (C) 1992 Frank Tore Johansen
7			*
8			* This program is free software; you can redistribute it and/or modify
9			* it under the terms of the GNU General Public License as published by
10			* the Free Software Foundation; either version 2 of the License, or
11			* (at your option) any later version.
12			*
13			* This program is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			* GNU General Public License for more details.
17			*
18			* You should have received a copy of the GNU General Public License
19			* along with this program; if not, write to the Free Software
20			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21			*
22			* The author can be reached via e-mail to <crossfire@schmorp.de>
23			*/
24	elmex	1.1
25			/** \file
26			* Image related communication
27			*
28			* \date 2003-12-02
29			*
30			* This file deals with the image related communication to the
31			* client. I've located all the functions in this file - this
32			* localizes it more, and means that we don't need to declare
33			* things like all the structures as globals.
34			*/
35
36			#include <global.h>
37			#include <sproto.h>
38
39	root	1.20	#include "crc.h"
40
41	elmex	1.1	#define MAX_FACE_SETS 20 /*< Maximum number of image sets the program will handle /
42
43			/** Information about one image */
44	root	1.3	typedef struct FaceInfo
45			{
46			uint8 data; /< image data /
47			uint16 datalen; /*< length of the xpm data /
48			uint32 checksum; /*< Checksum of face data /
49	elmex	1.1	} FaceInfo;
50
51			/** Information about one face set */
52	root	1.3	typedef struct
53			{
54			char prefix; /< /
55			char *fullname;
56
57			uint8 fallback; /*< faceset to use when an image is not found in this faceset /
58			char *size;
59			char *extension;
60			char *comment;
61
62			FaceInfo faces; /< images in this faceset /
63	elmex	1.1	} FaceSets;
64
65			static FaceSets facesets[MAX_FACE_SETS]; /*< All facesets /
66
67			/**
68			* Checks specified faceset is valid
69			* \param fsn faceset number
70			*/
71	root	1.3	int
72			is_valid_faceset (int fsn)
73	elmex	1.1	{
74	root	1.3	if (fsn >= 0 && fsn < MAX_FACE_SETS && facesets[fsn].prefix)
75			return TRUE;
76			return FALSE;
77	elmex	1.1	}
78
79			/**
80			* Frees all faceset information
81			*/
82	root	1.3	void
83			free_socket_images (void)
84	elmex	1.1	{
85	root	1.3	int num, q;
86	elmex	1.1
87	root	1.3	for (num = 0; num < MAX_FACE_SETS; num++)
88			{
89			if (facesets[num].prefix)
90			{
91	root	1.24	for (q = 0; q < faces.size (); q++)
92	root	1.3	if (facesets[num].faces[q].data)
93			free (facesets[num].faces[q].data);
94	root	1.15
95	root	1.3	free (facesets[num].prefix);
96			free (facesets[num].fullname);
97			free (facesets[num].size);
98			free (facesets[num].extension);
99			free (facesets[num].comment);
100			free (facesets[num].faces);
101	root	1.2	}
102	elmex	1.1	}
103			}
104
105			/**
106			* This returns the set we will actually use when sending
107			* a face. This is used because the image files may be sparse.
108			* This function is recursive. imageno is the face number we are
109			* trying to send
110			*
111			* If face is not found in specified faceset, tries with 'fallback' faceset.
112			*
113			* \param faceset faceset to check
114			* \param imageno image number
115			*
116			*/
117	root	1.3	static int
118			get_face_fallback (int faceset, int imageno)
119	elmex	1.1	{
120	root	1.3	/* faceset 0 is supposed to have every image, so just return. Doing
121			* so also prevents infinite loops in the case if it not having
122			* the face, but in that case, we are likely to crash when we try
123			* to access the data, but that is probably preferable to an infinite
124			* loop.
125			*/
126			if (faceset == 0)
127			return 0;
128
129			if (!facesets[faceset].prefix)
130			{
131			LOG (llevError, "get_face_fallback called with unused set (%d)?\n", faceset);
132			return 0; /* use default set */
133			}
134	root	1.15
135	root	1.3	if (facesets[faceset].faces[imageno].data)
136			return faceset;
137	root	1.15
138	root	1.3	return get_face_fallback (facesets[faceset].fallback, imageno);
139	elmex	1.1	}
140
141			/**
142			* Checks fallback are correctly defined.
143			* This is a simple recursive function that makes sure the fallbacks
144			* are all proper (eg, the fall back to defined sets, and also
145			* eventually fall back to 0). At the top level, togo is set to MAX_FACE_SETS,
146			* if togo gets to zero, it means we have a loop.
147			* This is only run when we first load the facesets.
148			*/
149	root	1.3	static void
150			check_faceset_fallback (int faceset, int togo)
151	elmex	1.1	{
152	root	1.3	int fallback = facesets[faceset].fallback;
153	elmex	1.1
154	root	1.3	/* proper case - falls back to base set */
155			if (fallback == 0)
156			return;
157
158			if (!facesets[fallback].prefix)
159			{
160			LOG (llevError, "Face set %d falls to non set faceset %d\n", faceset, fallback);
161			abort ();
162			}
163	root	1.15
164	root	1.3	togo--;
165			if (togo == 0)
166			{
167			LOG (llevError, "Infinite loop found in facesets. aborting.\n");
168			abort ();
169	elmex	1.1	}
170	root	1.15
171	root	1.3	check_faceset_fallback (fallback, togo);
172	elmex	1.1	}
173
174			#define MAX_IMAGE_SIZE 10000
175
176			/**
177			* Client tells us what type of faces it wants. Also sets
178			* the caching attribute.
179			*
180			*/
181	root	1.3	void
182	root	1.13	SetFaceMode (char buf, int len, client ns)
183	elmex	1.1	{
184	root	1.3	int mask = (atoi (buf) & CF_FACE_CACHE), mode = (atoi (buf) & ~CF_FACE_CACHE);
185	elmex	1.1
186	root	1.3	if (mode == CF_FACE_NONE)
187	root	1.7	ns->facecache = 1;
188	root	1.3	else if (mode != CF_FACE_PNG)
189	root	1.14	ns->send_packet_printf ("drawinfo %d %s", NDI_RED, "Warning - send unsupported face mode. Will use Png");
190	root	1.7
191	root	1.3	if (mask)
192	root	1.7	ns->facecache = 1;
193	elmex	1.1	}
194
195			/**
196			* Client has requested pixmap that it somehow missed getting.
197			* This will be called often if the client is
198			* caching images.
199			*/
200	root	1.3	void
201	root	1.15	SendFaceCmd (char buf, int len, client ns)
202	elmex	1.1	{
203	root	1.15	uint16 facenum = atoi (buf);
204	elmex	1.1
205	root	1.3	if (facenum != 0)
206			esrv_send_face (ns, facenum, 1);
207	elmex	1.1	}
208
209	root	1.24	// how lame
210			static void print_facename (packet &sl, const facedata &d)
211			{
212	root	1.25	for (int i = 0; i < CHKSUM_SIZE; ++i)
213			sl.printf ("%02x", d.chksum [i]);
214	root	1.24	}
215
216	root	1.26	// gcfclient uses the server-provided checksum for comparison,
217			// but always wrotes a broken checksum to its cache file, so we
218			// have to provide gcfclient with a useless checksum just to
219			// have to cache the image despite its bugs.
220			static uint32 gcfclient_checksum (const facedata *d)
221			{
222			uint32 csum = 0;
223
224			for (std::string::const_iterator i = d->data.begin ();
225			i != d->data.end ();
226			++i)
227			{
228			csum = rotate_right (csum);
229			csum += (uint8 )&*i;
230			}
231
232			return csum;
233			}
234
235	elmex	1.1	/**
236			* Sends a face to a client if they are in pixmap mode
237			* nothing gets sent in bitmap mode.
238			* If nocache is true (nonzero), ignore the cache setting from the client -
239			* this is needed for the askface, in which we really do want to send the
240			* face (and askface is the only place that should be setting it). Otherwise,
241			* we look at the facecache, and if set, send the image name.
242			*/
243	root	1.3	void
244	root	1.13	esrv_send_face (client *ns, short face_num, int nocache)
245	elmex	1.1	{
246	root	1.24	if (face_num <= 0 \|\| face_num >= faces.size ())
247	root	1.3	{
248			LOG (llevError, "esrv_send_face (%d) out of bounds??\n", face_num);
249			return;
250			}
251
252	root	1.24	const facedata *d = face_data (face_num, ns->faceset);
253
254	root	1.8	packet sl;
255	root	1.3
256			if (ns->facecache && !nocache)
257			{
258	root	1.26	if (ns->force_face0)
259			sl << "face " << uint16 (face_num);
260			else if (ns->image2)
261			sl << "face2 " << uint16 (face_num) << uint8 (0) << uint32 (ns->force_bad_checksum ? gcfclient_checksum (d) : 0);
262			else
263			sl << "face1 " << uint16 (face_num) << uint32 (ns->force_bad_checksum ? gcfclient_checksum (d) : 0);
264	root	1.24
265			// how lame
266			print_facename (sl, *d);
267	root	1.3
268	root	1.11	ns->send_packet (sl);
269	root	1.3	}
270			else
271			{
272	root	1.26	fprintf (stderr, "image %s %d\n", &faces [face_num].name, nocache);//D
273	root	1.6	sl << (ns->image2 ? "image2 " : "image ")
274			<< uint32 (face_num);
275
276	root	1.3	if (ns->image2)
277	root	1.24	sl << uint8 (0);
278	root	1.6
279	root	1.24	sl << uint32 (d->data.size ())
280			<< data (d->data.data (), d->data.size ());
281	root	1.6
282	root	1.11	ns->send_packet (sl);
283	elmex	1.1	}
284	root	1.6
285	root	1.3	ns->faces_sent[face_num] \|= NS_FACESENT_FACE;
286	elmex	1.1	}
287
288			/**
289			* Sends the number of images, checksum of the face file,
290			* and the image_info file information. See the doc/Developers/protocol
291			* if you want further detail.
292			*/
293
294	root	1.3	void
295	root	1.15	send_image_info (client ns, char params)
296	elmex	1.1	{
297	root	1.8	packet sl;
298	elmex	1.1
299	root	1.24	//TODO: second parameter is a checksum, but it makes no sense in this current framework
300			sl.printf ("replyinfo image_info\n%d\n%u\n", MAX_FACES, 0);
301	root	1.6
302	root	1.24	sl << "0:base:standard:0:32x32:none:The old 32x32 faceset.\n";
303	elmex	1.1
304	root	1.11	ns->send_packet (sl);
305	elmex	1.1	}
306
307			/**
308			* Sends requested face information.
309			* \param ns socket to send to
310			* \param params contains first and last index of face
311			*
312			* For each image in [start..stop] sends
313			* - checksum
314			* - name
315			*/
316	root	1.3	void
317	root	1.15	send_image_sums (client ns, char params)
318	elmex	1.1	{
319	root	1.3	int start, stop;
320	pippijn	1.22	char *cp;
321	root	1.3
322	root	1.8	packet sl;
323	root	1.3
324			start = atoi (params);
325			for (cp = params; *cp != '\0'; cp++)
326			if (*cp == ' ')
327			break;
328
329			stop = atoi (cp);
330	root	1.24	if (stop < start \|\| *cp == '\0' \|\| (stop - start) > 1000 \|\| stop >= MAX_FACES)
331	root	1.3	{
332	root	1.7	sl.printf ("replyinfo image_sums %d %d", start, stop);
333			ns->send_packet (sl);
334			sl.reset ();
335	root	1.3	return;
336			}
337
338	root	1.6	sl.printf ("replyinfo image_sums %d %d ", start, stop);
339	root	1.3
340	root	1.24	for (int i = start; i <= stop && i < faces.size (); i++)
341	root	1.3	{
342			ns->faces_sent[i] \|= NS_FACESENT_FACE;
343
344	root	1.24	const facedata *d = face_data (i, ns->faceset);
345	root	1.6
346	root	1.24	if (sl.room () < 2 + 4 + 1 + d->data.size () + 1)
347	root	1.23	break;
348
349	root	1.6	sl << uint16 (i)
350	root	1.24	<< uint32 (0) // checksum
351			<< uint8 (ns->faceset);
352
353			print_facename (sl, *d); sl << uint8 (0);
354	root	1.3	}
355	root	1.6
356	root	1.3	/* It would make more sense to catch this pre-emptively in the code above.
357			* however, if this really happens, we probably just want to cut down the
358			* size to less than 1000, since that is what we claim the protocol would
359			* support.
360			*/
361	root	1.23	//TODO: taken care of above, should simply abort or make sure the above code is correct
362	root	1.9	if (sl.length () >= MAXSOCKBUF)
363	root	1.3	{
364	root	1.9	LOG (llevError, "send_image_send: buffer overrun, %d > %d\n", sl.length (), MAXSOCKBUF);
365	root	1.3	abort ();
366	elmex	1.1	}
367	root	1.6
368	root	1.11	ns->send_packet (sl);
369	elmex	1.1	}
370	root	1.6