aboutsummaryrefslogtreecommitdiff
path: root/libXpm/src/CrBufFrI.c
blob: b191037dcd3d91d525c2c67881299dceae324f1a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
/*
 * Copyright (C) 1989-95 GROUPE BULL
 *
 * 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
 * GROUPE BULL 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 GROUPE BULL shall not be
 * used in advertising or otherwise to promote the sale, use or other dealings
 * in this Software without prior written authorization from GROUPE BULL.
 */

/*****************************************************************************\
*  CrBufFrI.c:                                                                *
*                                                                             *
*  XPM library                                                                *
*  Scan an image and possibly its mask and create an XPM buffer               *
*                                                                             *
*  Developed by Arnaud Le Hors                                                *
\*****************************************************************************/

/* October 2004, source code review by Thomas Biege <thomas@suse.de> */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "XpmI.h"

LFUNC(WriteColors, int, (char **dataptr, unsigned int *data_size,
			 unsigned int *used_size, XpmColor *colors,
			 unsigned int ncolors, unsigned int cpp));

LFUNC(WritePixels, void, (char *dataptr, unsigned int data_size,
			  unsigned int *used_size,
			  unsigned int width, unsigned int height,
			  unsigned int cpp, unsigned int *pixels,
			  XpmColor *colors));

LFUNC(WriteExtensions, void, (char *dataptr, unsigned int data_size,
			      unsigned int *used_size,
			      XpmExtension *ext, unsigned int num));

LFUNC(ExtensionsSize, unsigned int, (XpmExtension *ext, unsigned int num));
LFUNC(CommentsSize, int, (XpmInfo *info));

int
XpmCreateBufferFromImage(
    Display		 *display,
    char		**buffer_return,
    XImage		 *image,
    XImage		 *shapeimage,
    XpmAttributes	 *attributes)
{
    XpmImage xpmimage;
    XpmInfo info;
    int ErrorStatus;

    /* initialize return value */
    if (buffer_return)
	*buffer_return = NULL;

    /* create an XpmImage from the image */
    ErrorStatus = XpmCreateXpmImageFromImage(display, image, shapeimage,
					     &xpmimage, attributes);
    if (ErrorStatus != XpmSuccess)
	return (ErrorStatus);

    /* create the buffer from the XpmImage */
    if (attributes) {
	xpmSetInfo(&info, attributes);
	ErrorStatus =
	    XpmCreateBufferFromXpmImage(buffer_return, &xpmimage, &info);
    } else
	ErrorStatus =
	    XpmCreateBufferFromXpmImage(buffer_return, &xpmimage, NULL);

    /* free the XpmImage */
    XpmFreeXpmImage(&xpmimage);

    return (ErrorStatus);
}


#undef RETURN
#define RETURN(status) \
do \
{ \
      ErrorStatus = status; \
      goto error; \
}while(0)

int
XpmCreateBufferFromXpmImage(
    char	**buffer_return,
    XpmImage	 *image,
    XpmInfo	 *info)
{
    /* calculation variables */
    int ErrorStatus;
    char buf[BUFSIZ];
    unsigned int cmts, extensions, ext_size = 0;
    unsigned int l, cmt_size = 0;
    char *ptr = NULL, *p;
    unsigned int ptr_size, used_size, tmp;

    *buffer_return = NULL;

    cmts = info && (info->valuemask & XpmComments);
    extensions = info && (info->valuemask & XpmExtensions)
	&& info->nextensions;

    /* compute the extensions and comments size */
    if (extensions)
	ext_size = ExtensionsSize(info->extensions, info->nextensions);
    if (cmts)
	cmt_size = CommentsSize(info);

    /* write the header line */
#ifndef VOID_SPRINTF
    used_size =
#endif
    sprintf(buf, "/* XPM */\nstatic char * image_name[] = {\n");
#ifdef VOID_SPRINTF
    used_size = strlen(buf);
#endif
    ptr_size = used_size + ext_size + cmt_size + 1; /* ptr_size can't be 0 */
    if(ptr_size <= used_size ||
       ptr_size <= ext_size  ||
       ptr_size <= cmt_size)
    {
        return XpmNoMemory;
    }
    ptr = (char *) XpmMalloc(ptr_size);
    if (!ptr)
	return XpmNoMemory;
    strcpy(ptr, buf);

    /* write the values line */
    if (cmts && info->hints_cmt) {
#ifndef VOID_SPRINTF
	used_size +=
#endif
	snprintf(ptr + used_size, ptr_size-used_size, "/*%s*/\n", info->hints_cmt);
#ifdef VOID_SPRINTF
	used_size += strlen(info->hints_cmt) + 5;
#endif
    }
#ifndef VOID_SPRINTF
    l =
#endif
    sprintf(buf, "\"%d %d %d %d", image->width, image->height,
	    image->ncolors, image->cpp);
#ifdef VOID_SPRINTF
    l = strlen(buf);
#endif

    if (info && (info->valuemask & XpmHotspot)) {
#ifndef VOID_SPRINTF
	l +=
#endif
	snprintf(buf + l, sizeof(buf)-l, " %d %d", info->x_hotspot, info->y_hotspot);
#ifdef VOID_SPRINTF
	l = strlen(buf);
#endif
    }
    if (extensions) {
#ifndef VOID_SPRINTF
	l +=
#endif
	sprintf(buf + l, " XPMEXT");
#ifdef VOID_SPRINTF
	l = strlen(buf);
#endif
    }
#ifndef VOID_SPRINTF
    l +=
#endif
    sprintf(buf + l, "\",\n");
#ifdef VOID_SPRINTF
    l = strlen(buf);
#endif
    ptr_size += l;
    if(ptr_size <= l)
        RETURN(XpmNoMemory);
    p = (char *) XpmRealloc(ptr, ptr_size);
    if (!p)
	RETURN(XpmNoMemory);
    ptr = p;
    strcpy(ptr + used_size, buf);
    used_size += l;

    /* write colors */
    if (cmts && info->colors_cmt) {
#ifndef VOID_SPRINTF
	used_size +=
#endif
	snprintf(ptr + used_size, ptr_size-used_size, "/*%s*/\n", info->colors_cmt);
#ifdef VOID_SPRINTF
	used_size += strlen(info->colors_cmt) + 5;
#endif
    }
    ErrorStatus = WriteColors(&ptr, &ptr_size, &used_size,
			      image->colorTable, image->ncolors, image->cpp);
 
    if (ErrorStatus != XpmSuccess)
	RETURN(ErrorStatus);

    /*
     * now we know the exact size we need, realloc the data
     * 4 = 1 (for '"') + 3 (for '",\n')
     * 1 = - 2 (because the last line does not end with ',\n') + 3 (for '};\n')
     */
     if(image->width  > UINT_MAX / image->cpp ||
       (tmp = image->width * image->cpp + 4) <= 4 ||
        image->height > UINT_MAX / tmp ||
       (tmp = image->height * tmp + 1) <= 1 ||
       (ptr_size += tmp) <= tmp)
	RETURN(XpmNoMemory);

    p = (char *) XpmRealloc(ptr, ptr_size);
    if (!p)
	RETURN(XpmNoMemory);
    ptr = p;

    /* print pixels */
    if (cmts && info->pixels_cmt) {
#ifndef VOID_SPRINTF
	used_size +=
#endif
	snprintf(ptr + used_size, ptr_size-used_size, "/*%s*/\n", info->pixels_cmt);
#ifdef VOID_SPRINTF
	used_size += strlen(info->pixels_cmt) + 5;
#endif
    }
    WritePixels(ptr + used_size, ptr_size - used_size, &used_size, image->width, image->height,
		image->cpp, image->data, image->colorTable);

    /* print extensions */
    if (extensions)
	WriteExtensions(ptr + used_size, ptr_size-used_size, &used_size,
			info->extensions, info->nextensions);

    /* close the array */
    strcpy(ptr + used_size, "};\n");

    *buffer_return = ptr;

    return (XpmSuccess);

/* exit point in case of error, free only locally allocated variables */
error:
    if (ptr)
	XpmFree(ptr);
    return (ErrorStatus);
}


static int
WriteColors(
    char		**dataptr,
    unsigned int	 *data_size,
    unsigned int	 *used_size,
    XpmColor		 *colors,
    unsigned int	  ncolors,
    unsigned int	  cpp)
{
    char buf[BUFSIZ] = {0};
    unsigned int a, key, l;
    char *s, *s2;
    char **defaults;

    *buf = '"';
    for (a = 0; a < ncolors; a++, colors++) {

	defaults = (char **) colors;
	s = buf + 1;
	if(cpp > (sizeof(buf) - (s-buf)))
		return(XpmNoMemory);
	strncpy(s, *defaults++, cpp);
	s += cpp;

	for (key = 1; key <= NKEYS; key++, defaults++) {
	    if ((s2 = *defaults)) {
#ifndef VOID_SPRINTF
		s +=
#endif
		/* assume C99 compliance */
		snprintf(s, sizeof(buf) - (s-buf), "\t%s %s", xpmColorKeys[key - 1], s2);
#ifdef VOID_SPRINTF
		s += strlen(s);
#endif
		/* now let's check if s points out-of-bounds */
		if((s-buf) > sizeof(buf))
			return(XpmNoMemory);
	    }
	}
	if(sizeof(buf) - (s-buf) < 4)
		return(XpmNoMemory);
	strcpy(s, "\",\n");
	l = s + 3 - buf;
	if( *data_size                   >= UINT_MAX-l ||
	    *data_size + l               <= *used_size ||
	   (*data_size + l - *used_size) <= sizeof(buf))
		return(XpmNoMemory);
	s = (char *) XpmRealloc(*dataptr, *data_size + l);
	if (!s)
	    return (XpmNoMemory);
	*data_size += l;
	strcpy(s + *used_size, buf);
	*used_size += l;
	*dataptr = s;
    }
    return (XpmSuccess);
}

static void
WritePixels(
    char		*dataptr,
    unsigned int	 data_size,
    unsigned int	*used_size,
    unsigned int	 width,
    unsigned int	 height,
    unsigned int	 cpp,
    unsigned int	*pixels,
    XpmColor		*colors)
{
    char *s = dataptr;
    unsigned int x, y, h;

    if(height <= 1)
    	return;

    h = height - 1;
    for (y = 0; y < h; y++) {
	*s++ = '"';
	for (x = 0; x < width; x++, pixels++) {
	    if(cpp >= (data_size - (s-dataptr)))
		return;
	    strncpy(s, colors[*pixels].string, cpp); /* how can we trust *pixels? :-\ */
	    s += cpp;
	}
	if((data_size - (s-dataptr)) < 4)
		return;
	strcpy(s, "\",\n");
	s += 3;
    }
    /* duplicate some code to avoid a test in the loop */
    *s++ = '"';
    for (x = 0; x < width; x++, pixels++) {
	if(cpp >= (data_size - (s-dataptr)))
	    return;
	strncpy(s, colors[*pixels].string, cpp); /* how can we trust *pixels? */
	s += cpp;
    }
    *s++ = '"';
    *used_size += s - dataptr;
}

static unsigned int
ExtensionsSize(
    XpmExtension	*ext,
    unsigned int	 num)
{
    unsigned int x, y, a, size;
    char **line;

    size = 0;
    if(num == 0)
    	return(0); /* ok? */
    for (x = 0; x < num; x++, ext++) {
	/* 11 = 10 (for ',\n"XPMEXT ') + 1 (for '"') */
	size += strlen(ext->name) + 11;
	a = ext->nlines; /* how can we trust ext->nlines to be not out-of-bounds? */
	for (y = 0, line = ext->lines; y < a; y++, line++)
	    /* 4 = 3 (for ',\n"') + 1 (for '"') */
	    size += strlen(*line) + 4;
    }
    /* 13 is for ',\n"XPMENDEXT"' */
    if(size > UINT_MAX - 13) /* unlikely */
    	return(0);
    return size + 13;
}

static void
WriteExtensions(
    char		*dataptr,
    unsigned int	 data_size,
    unsigned int	*used_size,
    XpmExtension	*ext,
    unsigned int	 num)
{
    unsigned int x, y, a;
    char **line;
    char *s = dataptr;

    for (x = 0; x < num; x++, ext++) {
#ifndef VOID_SPRINTF
	s +=
#endif
	snprintf(s, data_size - (s-dataptr), ",\n\"XPMEXT %s\"", ext->name);
#ifdef VOID_SPRINTF
	s += strlen(ext->name) + 11;
#endif
	a = ext->nlines;
	for (y = 0, line = ext->lines; y < a; y++, line++) {
#ifndef VOID_SPRINTF
	    s +=
#endif
	    snprintf(s, data_size - (s-dataptr), ",\n\"%s\"", *line);
#ifdef VOID_SPRINTF
	    s += strlen(*line) + 4;
#endif
	}
    }
    strncpy(s, ",\n\"XPMENDEXT\"", data_size - (s-dataptr)-1);
    *used_size += s - dataptr + 13;
}

static int
CommentsSize(XpmInfo *info)
{
    int size = 0;

    /* 5 = 2 (for "/_*") + 3 (for "*_/\n") */
    /* wrap possible but *very* unlikely */
    if (info->hints_cmt)
	size += 5 + strlen(info->hints_cmt);

    if (info->colors_cmt)
	size += 5 + strlen(info->colors_cmt);

    if (info->pixels_cmt)
	size += 5 + strlen(info->pixels_cmt);

    return size;
}