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)
{
  ns->send_face (atoi (buf), 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
client::send_face (faceidx facenum, bool forced)
{
  // never send face 0. ever. it does not exist.
  if (!facenum)
    return;

  const facedata *d = face_data (facenum, faceset);

  if (!d)
    {
      LOG (llevError, "client::send_face (%d) out of bounds??\n", facenum);
      return;
    }

  packet sl;

  if (facecache && !forced)
    {
      if (faces_sent[facenum])
        return;

      faces_sent[facenum] = true;

      faceinfo *f = face_info (facenum);
      if (f->smooth && EMI_smooth)
        {
          send_face (f->smooth);

          packet sl ("smooth");

          sl << uint16 (facenum)
             << uint16 (f->smooth);

          send_packet (sl);
        }

      if (force_face0)
        sl << "face " << uint16 (facenum);
      else if (image2)
        sl << "face2 " << uint16 (facenum) << uint8 (0) << uint32 (force_bad_checksum ? gcfclient_checksum (d) : 0);
      else
        sl << "face1 " << uint16 (facenum) << uint32 (force_bad_checksum ? gcfclient_checksum (d) : 0);

      // how lame
      print_facename (sl, *d);
    }
  else
    {
      sl << (image2 ? "image2 " : "image ")
         << uint32 (facenum);

      if (image2)
        sl << uint8 (0);

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

  send_packet (sl);
}

// send all faces of this object to the client
// this uses more bandwidth initially, but makes
// animations look much smoother, and every client
// is supposed to do client-side caching anyways.
void
client::send_faces (object *ob)
{
  send_face (ob->face);

  if (ob->animation_id)
    {
      animation &anim = animations [ob->animation_id];

      for (int i = 0; i < anim.num_animations; i++)
        send_face (anim.faces [i]);
    }
}

/**
 * Need to send an animation sequence to the client.
 * We will send appropriate face commands to the client if we haven't
 * sent them the face yet (this can become quite costly in terms of
 * how much we are sending - on the other hand, this should only happen
 * when the player logs in and picks stuff up.
 */
void
client::send_animation (short anim_num)
{
  /* Do some checking on the anim_num we got.  Note that the animations
   * are added in contigous order, so if the number is in the valid
   * range, it must be a valid animation.
   */
  if (anim_num < 0 || anim_num > num_animations)
    {
      LOG (llevError, "esrv_send_anim (%d) out of bounds??\n", anim_num);
      return;
    }

  packet sl ("anim");

  sl << uint16 (anim_num)
     << uint16 (0); /* flags - not used right now */

  /* Build up the list of faces.  Also, send any information (ie, the
   * the face itself) down to the client.
   */
  for (int i = 0; i < animations[anim_num].num_animations; i++)
    {
      send_face (animations[anim_num].faces[i]);
      sl << uint16 (animations[anim_num].faces[i]);   /* flags - not used right now */
    }

  send_packet (sl);

  anims_sent[anim_num] = 1;
}

/**
 * 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] = true;

      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:	1.30
Committed:	Wed Mar 14 01:19:10 2007 UTC (17 years, 2 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.29:	+16 -42 lines
Log Message:	- send smooth faces automatically with their base face, anything else just complictaes everything and clients who want smoothing would requets the face anyways. - this reduces the size of struct client considerably, from 300k to about 300k (whoops).
#	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	1.28	ns->send_face (atoi (buf), 1);
204	elmex	1.1	}
205
206	root	1.24	// how lame
207			static void print_facename (packet &sl, const facedata &d)
208			{
209	root	1.25	for (int i = 0; i < CHKSUM_SIZE; ++i)
210			sl.printf ("%02x", d.chksum [i]);
211	root	1.24	}
212
213	root	1.26	// gcfclient uses the server-provided checksum for comparison,
214			// but always wrotes a broken checksum to its cache file, so we
215			// have to provide gcfclient with a useless checksum just to
216			// have to cache the image despite its bugs.
217			static uint32 gcfclient_checksum (const facedata *d)
218			{
219			uint32 csum = 0;
220
221			for (std::string::const_iterator i = d->data.begin ();
222			i != d->data.end ();
223			++i)
224			{
225			csum = rotate_right (csum);
226			csum += (uint8 )&*i;
227			}
228
229			return csum;
230			}
231
232	elmex	1.1	/**
233			* Sends a face to a client if they are in pixmap mode
234			* nothing gets sent in bitmap mode.
235			* If nocache is true (nonzero), ignore the cache setting from the client -
236			* this is needed for the askface, in which we really do want to send the
237			* face (and askface is the only place that should be setting it). Otherwise,
238			* we look at the facecache, and if set, send the image name.
239			*/
240	root	1.3	void
241	root	1.28	client::send_face (faceidx facenum, bool forced)
242	elmex	1.1	{
243	root	1.28	// never send face 0. ever. it does not exist.
244			if (!facenum)
245			return;
246
247			const facedata *d = face_data (facenum, faceset);
248
249			if (!d)
250	root	1.3	{
251	root	1.28	LOG (llevError, "client::send_face (%d) out of bounds??\n", facenum);
252	root	1.3	return;
253			}
254
255	root	1.8	packet sl;
256	root	1.3
257	root	1.28	if (facecache && !forced)
258	root	1.3	{
259	root	1.30	if (faces_sent[facenum])
260	root	1.28	return;
261
262	root	1.30	faces_sent[facenum] = true;
263
264			faceinfo *f = face_info (facenum);
265			if (f->smooth && EMI_smooth)
266			{
267			send_face (f->smooth);
268
269			packet sl ("smooth");
270
271			sl << uint16 (facenum)
272			<< uint16 (f->smooth);
273
274			send_packet (sl);
275			}
276	root	1.28
277			if (force_face0)
278			sl << "face " << uint16 (facenum);
279			else if (image2)
280			sl << "face2 " << uint16 (facenum) << uint8 (0) << uint32 (force_bad_checksum ? gcfclient_checksum (d) : 0);
281	root	1.26	else
282	root	1.28	sl << "face1 " << uint16 (facenum) << uint32 (force_bad_checksum ? gcfclient_checksum (d) : 0);
283	root	1.24
284			// how lame
285			print_facename (sl, *d);
286	root	1.3	}
287			else
288			{
289	root	1.28	sl << (image2 ? "image2 " : "image ")
290			<< uint32 (facenum);
291	root	1.6
292	root	1.28	if (image2)
293	root	1.24	sl << uint8 (0);
294	root	1.6
295	root	1.24	sl << uint32 (d->data.size ())
296			<< data (d->data.data (), d->data.size ());
297	root	1.28	}
298
299			send_packet (sl);
300			}
301
302			// send all faces of this object to the client
303			// this uses more bandwidth initially, but makes
304			// animations look much smoother, and every client
305			// is supposed to do client-side caching anyways.
306			void
307			client::send_faces (object *ob)
308			{
309			send_face (ob->face);
310
311			if (ob->animation_id)
312			{
313			animation &anim = animations [ob->animation_id];
314
315			for (int i = 0; i < anim.num_animations; i++)
316			send_face (anim.faces [i]);
317			}
318			}
319
320			/**
321			* Need to send an animation sequence to the client.
322			* We will send appropriate face commands to the client if we haven't
323			* sent them the face yet (this can become quite costly in terms of
324			* how much we are sending - on the other hand, this should only happen
325			* when the player logs in and picks stuff up.
326			*/
327			void
328			client::send_animation (short anim_num)
329			{
330			/* Do some checking on the anim_num we got. Note that the animations
331			* are added in contigous order, so if the number is in the valid
332			* range, it must be a valid animation.
333			*/
334			if (anim_num < 0 \|\| anim_num > num_animations)
335			{
336			LOG (llevError, "esrv_send_anim (%d) out of bounds??\n", anim_num);
337			return;
338			}
339
340			packet sl ("anim");
341
342			sl << uint16 (anim_num)
343			<< uint16 (0); /* flags - not used right now */
344
345			/* Build up the list of faces. Also, send any information (ie, the
346			* the face itself) down to the client.
347			*/
348			for (int i = 0; i < animations[anim_num].num_animations; i++)
349			{
350			send_face (animations[anim_num].faces[i]);
351			sl << uint16 (animations[anim_num].faces[i]); /* flags - not used right now */
352	elmex	1.1	}
353	root	1.6
354	root	1.28	send_packet (sl);
355
356			anims_sent[anim_num] = 1;
357	elmex	1.1	}
358
359			/**
360			* Sends the number of images, checksum of the face file,
361			* and the image_info file information. See the doc/Developers/protocol
362			* if you want further detail.
363			*/
364	root	1.3	void
365	root	1.15	send_image_info (client ns, char params)
366	elmex	1.1	{
367	root	1.8	packet sl;
368	elmex	1.1
369	root	1.24	//TODO: second parameter is a checksum, but it makes no sense in this current framework
370			sl.printf ("replyinfo image_info\n%d\n%u\n", MAX_FACES, 0);
371	root	1.6
372	root	1.24	sl << "0:base:standard:0:32x32:none:The old 32x32 faceset.\n";
373	elmex	1.1
374	root	1.11	ns->send_packet (sl);
375	elmex	1.1	}
376
377			/**
378			* Sends requested face information.
379			* \param ns socket to send to
380			* \param params contains first and last index of face
381			*
382			* For each image in [start..stop] sends
383			* - checksum
384			* - name
385			*/
386	root	1.3	void
387	root	1.15	send_image_sums (client ns, char params)
388	elmex	1.1	{
389	root	1.3	int start, stop;
390	pippijn	1.22	char *cp;
391	root	1.3
392	root	1.8	packet sl;
393	root	1.3
394			start = atoi (params);
395			for (cp = params; *cp != '\0'; cp++)
396			if (*cp == ' ')
397			break;
398
399			stop = atoi (cp);
400	root	1.24	if (stop < start \|\| *cp == '\0' \|\| (stop - start) > 1000 \|\| stop >= MAX_FACES)
401	root	1.3	{
402	root	1.7	sl.printf ("replyinfo image_sums %d %d", start, stop);
403			ns->send_packet (sl);
404			sl.reset ();
405	root	1.3	return;
406			}
407
408	root	1.6	sl.printf ("replyinfo image_sums %d %d ", start, stop);
409	root	1.3
410	root	1.24	for (int i = start; i <= stop && i < faces.size (); i++)
411	root	1.3	{
412	root	1.30	ns->faces_sent[i] = true;
413	root	1.3
414	root	1.24	const facedata *d = face_data (i, ns->faceset);
415	root	1.6
416	root	1.24	if (sl.room () < 2 + 4 + 1 + d->data.size () + 1)
417	root	1.23	break;
418
419	root	1.6	sl << uint16 (i)
420	root	1.24	<< uint32 (0) // checksum
421			<< uint8 (ns->faceset);
422
423			print_facename (sl, *d); sl << uint8 (0);
424	root	1.3	}
425	root	1.6
426	root	1.3	/* It would make more sense to catch this pre-emptively in the code above.
427			* however, if this really happens, we probably just want to cut down the
428			* size to less than 1000, since that is what we claim the protocol would
429			* support.
430			*/
431	root	1.23	//TODO: taken care of above, should simply abort or make sure the above code is correct
432	root	1.9	if (sl.length () >= MAXSOCKBUF)
433	root	1.3	{
434	root	1.9	LOG (llevError, "send_image_send: buffer overrun, %d > %d\n", sl.length (), MAXSOCKBUF);
435	root	1.3	abort ();
436	elmex	1.1	}
437	root	1.6
438	root	1.11	ns->send_packet (sl);
439	elmex	1.1	}
440	root	1.6