1 /*
2 * Copyright © 2002 Keith Packard
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the
13 * next paragraph) shall be included in all copies or substantial
14 * portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
20 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26 #include "xcursor.h"
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <dirent.h>
31
32 /*
33 * From libXcursor/include/X11/extensions/Xcursor.h
34 */
35
36 #define XcursorTrue 1
37 #define XcursorFalse 0
38
39 /*
40 * Cursor files start with a header. The header
41 * contains a magic number, a version number and a
42 * table of contents which has type and offset information
43 * for the remaining tables in the file.
44 *
45 * File minor versions increment for compatible changes
46 * File major versions increment for incompatible changes (never, we hope)
47 *
48 * Chunks of the same type are always upward compatible. Incompatible
49 * changes are made with new chunk types; the old data can remain under
50 * the old type. Upward compatible changes can add header data as the
51 * header lengths are specified in the file.
52 *
53 * File:
54 * FileHeader
55 * LISTofChunk
56 *
57 * FileHeader:
58 * CARD32 magic magic number
59 * CARD32 header bytes in file header
60 * CARD32 version file version
61 * CARD32 ntoc number of toc entries
62 * LISTofFileToc toc table of contents
63 *
64 * FileToc:
65 * CARD32 type entry type
66 * CARD32 subtype entry subtype (size for images)
67 * CARD32 position absolute file position
68 */
69
70 #define XCURSOR_MAGIC 0x72756358 /* "Xcur" LSBFirst */
71
72 /*
73 * Current Xcursor version number. Will be substituted by configure
74 * from the version in the libXcursor configure.ac file.
75 */
76
77 #define XCURSOR_LIB_MAJOR 1
78 #define XCURSOR_LIB_MINOR 1
79 #define XCURSOR_LIB_REVISION 13
80 #define XCURSOR_LIB_VERSION ((XCURSOR_LIB_MAJOR * 10000) + \
81 (XCURSOR_LIB_MINOR * 100) + \
82 (XCURSOR_LIB_REVISION))
83
84 /*
85 * This version number is stored in cursor files; changes to the
86 * file format require updating this version number
87 */
88 #define XCURSOR_FILE_MAJOR 1
89 #define XCURSOR_FILE_MINOR 0
90 #define XCURSOR_FILE_VERSION ((XCURSOR_FILE_MAJOR << 16) | (XCURSOR_FILE_MINOR))
91 #define XCURSOR_FILE_HEADER_LEN (4 * 4)
92 #define XCURSOR_FILE_TOC_LEN (3 * 4)
93
94 typedef struct _XcursorFileToc {
95 XcursorUInt type; /* chunk type */
96 XcursorUInt subtype; /* subtype (size for images) */
97 XcursorUInt position; /* absolute position in file */
98 } XcursorFileToc;
99
100 typedef struct _XcursorFileHeader {
101 XcursorUInt magic; /* magic number */
102 XcursorUInt header; /* byte length of header */
103 XcursorUInt version; /* file version number */
104 XcursorUInt ntoc; /* number of toc entries */
105 XcursorFileToc *tocs; /* table of contents */
106 } XcursorFileHeader;
107
108 /*
109 * The rest of the file is a list of chunks, each tagged by type
110 * and version.
111 *
112 * Chunk:
113 * ChunkHeader
114 * <extra type-specific header fields>
115 * <type-specific data>
116 *
117 * ChunkHeader:
118 * CARD32 header bytes in chunk header + type header
119 * CARD32 type chunk type
120 * CARD32 subtype chunk subtype
121 * CARD32 version chunk type version
122 */
123
124 #define XCURSOR_CHUNK_HEADER_LEN (4 * 4)
125
126 typedef struct _XcursorChunkHeader {
127 XcursorUInt header; /* bytes in chunk header */
128 XcursorUInt type; /* chunk type */
129 XcursorUInt subtype; /* chunk subtype (size for images) */
130 XcursorUInt version; /* version of this type */
131 } XcursorChunkHeader;
132
133 /*
134 * Here's a list of the known chunk types
135 */
136
137 /*
138 * Comments consist of a 4-byte length field followed by
139 * UTF-8 encoded text
140 *
141 * Comment:
142 * ChunkHeader header chunk header
143 * CARD32 length bytes in text
144 * LISTofCARD8 text UTF-8 encoded text
145 */
146
147 #define XCURSOR_COMMENT_TYPE 0xfffe0001
148 #define XCURSOR_COMMENT_VERSION 1
149 #define XCURSOR_COMMENT_HEADER_LEN (XCURSOR_CHUNK_HEADER_LEN + (1 *4))
150 #define XCURSOR_COMMENT_COPYRIGHT 1
151 #define XCURSOR_COMMENT_LICENSE 2
152 #define XCURSOR_COMMENT_OTHER 3
153 #define XCURSOR_COMMENT_MAX_LEN 0x100000
154
155 typedef struct _XcursorComment {
156 XcursorUInt version;
157 XcursorUInt comment_type;
158 char *comment;
159 } XcursorComment;
160
161 /*
162 * Each cursor image occupies a separate image chunk.
163 * The length of the image header follows the chunk header
164 * so that future versions can extend the header without
165 * breaking older applications
166 *
167 * Image:
168 * ChunkHeader header chunk header
169 * CARD32 width actual width
170 * CARD32 height actual height
171 * CARD32 xhot hot spot x
172 * CARD32 yhot hot spot y
173 * CARD32 delay animation delay
174 * LISTofCARD32 pixels ARGB pixels
175 */
176
177 #define XCURSOR_IMAGE_TYPE 0xfffd0002
178 #define XCURSOR_IMAGE_VERSION 1
179 #define XCURSOR_IMAGE_HEADER_LEN (XCURSOR_CHUNK_HEADER_LEN + (5*4))
180 #define XCURSOR_IMAGE_MAX_SIZE 0x7fff /* 32767x32767 max cursor size */
181
182 typedef struct _XcursorFile XcursorFile;
183
184 struct _XcursorFile {
185 void *closure;
186 int (*read) (XcursorFile *file, unsigned char *buf, int len);
187 int (*write) (XcursorFile *file, unsigned char *buf, int len);
188 int (*seek) (XcursorFile *file, long offset, int whence);
189 };
190
191 typedef struct _XcursorComments {
192 int ncomment; /* number of comments */
193 XcursorComment **comments; /* array of XcursorComment pointers */
194 } XcursorComments;
195
196 /*
197 * From libXcursor/src/file.c
198 */
199
200 static XcursorImage *
XcursorImageCreate(int width,int height)201 XcursorImageCreate (int width, int height)
202 {
203 XcursorImage *image;
204
205 if (width < 0 || height < 0)
206 return NULL;
207 if (width > XCURSOR_IMAGE_MAX_SIZE || height > XCURSOR_IMAGE_MAX_SIZE)
208 return NULL;
209
210 image = malloc (sizeof (XcursorImage) +
211 width * height * sizeof (XcursorPixel));
212 if (!image)
213 return NULL;
214 image->version = XCURSOR_IMAGE_VERSION;
215 image->pixels = (XcursorPixel *) (image + 1);
216 image->size = width > height ? width : height;
217 image->width = width;
218 image->height = height;
219 image->delay = 0;
220 return image;
221 }
222
223 static void
XcursorImageDestroy(XcursorImage * image)224 XcursorImageDestroy (XcursorImage *image)
225 {
226 free (image);
227 }
228
229 static XcursorImages *
XcursorImagesCreate(int size)230 XcursorImagesCreate (int size)
231 {
232 XcursorImages *images;
233
234 images = malloc (sizeof (XcursorImages) +
235 size * sizeof (XcursorImage *));
236 if (!images)
237 return NULL;
238 images->nimage = 0;
239 images->images = (XcursorImage **) (images + 1);
240 images->name = NULL;
241 return images;
242 }
243
244 void
XcursorImagesDestroy(XcursorImages * images)245 XcursorImagesDestroy (XcursorImages *images)
246 {
247 int n;
248
249 if (!images)
250 return;
251
252 for (n = 0; n < images->nimage; n++)
253 XcursorImageDestroy (images->images[n]);
254 if (images->name)
255 free (images->name);
256 free (images);
257 }
258
259 static void
XcursorImagesSetName(XcursorImages * images,const char * name)260 XcursorImagesSetName (XcursorImages *images, const char *name)
261 {
262 char *new;
263
264 if (!images || !name)
265 return;
266
267 new = malloc (strlen (name) + 1);
268
269 if (!new)
270 return;
271
272 strcpy (new, name);
273 if (images->name)
274 free (images->name);
275 images->name = new;
276 }
277
278 static XcursorBool
_XcursorReadUInt(XcursorFile * file,XcursorUInt * u)279 _XcursorReadUInt (XcursorFile *file, XcursorUInt *u)
280 {
281 unsigned char bytes[4];
282
283 if (!file || !u)
284 return XcursorFalse;
285
286 if ((*file->read) (file, bytes, 4) != 4)
287 return XcursorFalse;
288
289 *u = ((XcursorUInt)(bytes[0]) << 0) |
290 ((XcursorUInt)(bytes[1]) << 8) |
291 ((XcursorUInt)(bytes[2]) << 16) |
292 ((XcursorUInt)(bytes[3]) << 24);
293 return XcursorTrue;
294 }
295
296 static void
_XcursorFileHeaderDestroy(XcursorFileHeader * fileHeader)297 _XcursorFileHeaderDestroy (XcursorFileHeader *fileHeader)
298 {
299 free (fileHeader);
300 }
301
302 static XcursorFileHeader *
_XcursorFileHeaderCreate(int ntoc)303 _XcursorFileHeaderCreate (int ntoc)
304 {
305 XcursorFileHeader *fileHeader;
306
307 if (ntoc > 0x10000)
308 return NULL;
309 fileHeader = malloc (sizeof (XcursorFileHeader) +
310 ntoc * sizeof (XcursorFileToc));
311 if (!fileHeader)
312 return NULL;
313 fileHeader->magic = XCURSOR_MAGIC;
314 fileHeader->header = XCURSOR_FILE_HEADER_LEN;
315 fileHeader->version = XCURSOR_FILE_VERSION;
316 fileHeader->ntoc = ntoc;
317 fileHeader->tocs = (XcursorFileToc *) (fileHeader + 1);
318 return fileHeader;
319 }
320
321 static XcursorFileHeader *
_XcursorReadFileHeader(XcursorFile * file)322 _XcursorReadFileHeader (XcursorFile *file)
323 {
324 XcursorFileHeader head, *fileHeader;
325 XcursorUInt skip;
326 unsigned int n;
327
328 if (!file)
329 return NULL;
330
331 if (!_XcursorReadUInt (file, &head.magic))
332 return NULL;
333 if (head.magic != XCURSOR_MAGIC)
334 return NULL;
335 if (!_XcursorReadUInt (file, &head.header))
336 return NULL;
337 if (!_XcursorReadUInt (file, &head.version))
338 return NULL;
339 if (!_XcursorReadUInt (file, &head.ntoc))
340 return NULL;
341 skip = head.header - XCURSOR_FILE_HEADER_LEN;
342 if (skip)
343 if ((*file->seek) (file, skip, SEEK_CUR) == EOF)
344 return NULL;
345 fileHeader = _XcursorFileHeaderCreate (head.ntoc);
346 if (!fileHeader)
347 return NULL;
348 fileHeader->magic = head.magic;
349 fileHeader->header = head.header;
350 fileHeader->version = head.version;
351 fileHeader->ntoc = head.ntoc;
352 for (n = 0; n < fileHeader->ntoc; n++)
353 {
354 if (!_XcursorReadUInt (file, &fileHeader->tocs[n].type))
355 break;
356 if (!_XcursorReadUInt (file, &fileHeader->tocs[n].subtype))
357 break;
358 if (!_XcursorReadUInt (file, &fileHeader->tocs[n].position))
359 break;
360 }
361 if (n != fileHeader->ntoc)
362 {
363 _XcursorFileHeaderDestroy (fileHeader);
364 return NULL;
365 }
366 return fileHeader;
367 }
368
369 static XcursorBool
_XcursorSeekToToc(XcursorFile * file,XcursorFileHeader * fileHeader,int toc)370 _XcursorSeekToToc (XcursorFile *file,
371 XcursorFileHeader *fileHeader,
372 int toc)
373 {
374 if (!file || !fileHeader || \
375 (*file->seek) (file, fileHeader->tocs[toc].position, SEEK_SET) == EOF)
376 return XcursorFalse;
377 return XcursorTrue;
378 }
379
380 static XcursorBool
_XcursorFileReadChunkHeader(XcursorFile * file,XcursorFileHeader * fileHeader,int toc,XcursorChunkHeader * chunkHeader)381 _XcursorFileReadChunkHeader (XcursorFile *file,
382 XcursorFileHeader *fileHeader,
383 int toc,
384 XcursorChunkHeader *chunkHeader)
385 {
386 if (!file || !fileHeader || !chunkHeader)
387 return XcursorFalse;
388 if (!_XcursorSeekToToc (file, fileHeader, toc))
389 return XcursorFalse;
390 if (!_XcursorReadUInt (file, &chunkHeader->header))
391 return XcursorFalse;
392 if (!_XcursorReadUInt (file, &chunkHeader->type))
393 return XcursorFalse;
394 if (!_XcursorReadUInt (file, &chunkHeader->subtype))
395 return XcursorFalse;
396 if (!_XcursorReadUInt (file, &chunkHeader->version))
397 return XcursorFalse;
398 /* sanity check */
399 if (chunkHeader->type != fileHeader->tocs[toc].type ||
400 chunkHeader->subtype != fileHeader->tocs[toc].subtype)
401 return XcursorFalse;
402 return XcursorTrue;
403 }
404
405 #define dist(a,b) ((a) > (b) ? (a) - (b) : (b) - (a))
406
407 static XcursorDim
_XcursorFindBestSize(XcursorFileHeader * fileHeader,XcursorDim size,int * nsizesp)408 _XcursorFindBestSize (XcursorFileHeader *fileHeader,
409 XcursorDim size,
410 int *nsizesp)
411 {
412 unsigned int n;
413 int nsizes = 0;
414 XcursorDim bestSize = 0;
415 XcursorDim thisSize;
416
417 if (!fileHeader || !nsizesp)
418 return 0;
419
420 for (n = 0; n < fileHeader->ntoc; n++)
421 {
422 if (fileHeader->tocs[n].type != XCURSOR_IMAGE_TYPE)
423 continue;
424 thisSize = fileHeader->tocs[n].subtype;
425 if (!bestSize || dist (thisSize, size) < dist (bestSize, size))
426 {
427 bestSize = thisSize;
428 nsizes = 1;
429 }
430 else if (thisSize == bestSize)
431 nsizes++;
432 }
433 *nsizesp = nsizes;
434 return bestSize;
435 }
436
437 static int
_XcursorFindImageToc(XcursorFileHeader * fileHeader,XcursorDim size,int count)438 _XcursorFindImageToc (XcursorFileHeader *fileHeader,
439 XcursorDim size,
440 int count)
441 {
442 unsigned int toc;
443 XcursorDim thisSize;
444
445 if (!fileHeader)
446 return 0;
447
448 for (toc = 0; toc < fileHeader->ntoc; toc++)
449 {
450 if (fileHeader->tocs[toc].type != XCURSOR_IMAGE_TYPE)
451 continue;
452 thisSize = fileHeader->tocs[toc].subtype;
453 if (thisSize != size)
454 continue;
455 if (!count)
456 break;
457 count--;
458 }
459 if (toc == fileHeader->ntoc)
460 return -1;
461 return toc;
462 }
463
464 static XcursorImage *
_XcursorReadImage(XcursorFile * file,XcursorFileHeader * fileHeader,int toc)465 _XcursorReadImage (XcursorFile *file,
466 XcursorFileHeader *fileHeader,
467 int toc)
468 {
469 XcursorChunkHeader chunkHeader;
470 XcursorImage head;
471 XcursorImage *image;
472 int n;
473 XcursorPixel *p;
474
475 if (!file || !fileHeader)
476 return NULL;
477
478 if (!_XcursorFileReadChunkHeader (file, fileHeader, toc, &chunkHeader))
479 return NULL;
480 if (!_XcursorReadUInt (file, &head.width))
481 return NULL;
482 if (!_XcursorReadUInt (file, &head.height))
483 return NULL;
484 if (!_XcursorReadUInt (file, &head.xhot))
485 return NULL;
486 if (!_XcursorReadUInt (file, &head.yhot))
487 return NULL;
488 if (!_XcursorReadUInt (file, &head.delay))
489 return NULL;
490 /* sanity check data */
491 if (head.width > XCURSOR_IMAGE_MAX_SIZE ||
492 head.height > XCURSOR_IMAGE_MAX_SIZE)
493 return NULL;
494 if (head.width == 0 || head.height == 0)
495 return NULL;
496 if (head.xhot > head.width || head.yhot > head.height)
497 return NULL;
498
499 /* Create the image and initialize it */
500 image = XcursorImageCreate (head.width, head.height);
501 if (image == NULL)
502 return NULL;
503 if (chunkHeader.version < image->version)
504 image->version = chunkHeader.version;
505 image->size = chunkHeader.subtype;
506 image->xhot = head.xhot;
507 image->yhot = head.yhot;
508 image->delay = head.delay;
509 n = image->width * image->height;
510 p = image->pixels;
511 while (n--)
512 {
513 if (!_XcursorReadUInt (file, p))
514 {
515 XcursorImageDestroy (image);
516 return NULL;
517 }
518 p++;
519 }
520 return image;
521 }
522
523 static XcursorImages *
XcursorXcFileLoadImages(XcursorFile * file,int size)524 XcursorXcFileLoadImages (XcursorFile *file, int size)
525 {
526 XcursorFileHeader *fileHeader;
527 XcursorDim bestSize;
528 int nsize;
529 XcursorImages *images;
530 int n;
531 int toc;
532
533 if (!file || size < 0)
534 return NULL;
535 fileHeader = _XcursorReadFileHeader (file);
536 if (!fileHeader)
537 return NULL;
538 bestSize = _XcursorFindBestSize (fileHeader, (XcursorDim) size, &nsize);
539 if (!bestSize)
540 {
541 _XcursorFileHeaderDestroy (fileHeader);
542 return NULL;
543 }
544 images = XcursorImagesCreate (nsize);
545 if (!images)
546 {
547 _XcursorFileHeaderDestroy (fileHeader);
548 return NULL;
549 }
550 for (n = 0; n < nsize; n++)
551 {
552 toc = _XcursorFindImageToc (fileHeader, bestSize, n);
553 if (toc < 0)
554 break;
555 images->images[images->nimage] = _XcursorReadImage (file, fileHeader,
556 toc);
557 if (!images->images[images->nimage])
558 break;
559 images->nimage++;
560 }
561 _XcursorFileHeaderDestroy (fileHeader);
562 if (images->nimage != nsize)
563 {
564 XcursorImagesDestroy (images);
565 images = NULL;
566 }
567 return images;
568 }
569
570 static int
_XcursorStdioFileRead(XcursorFile * file,unsigned char * buf,int len)571 _XcursorStdioFileRead (XcursorFile *file, unsigned char *buf, int len)
572 {
573 FILE *f = file->closure;
574 return fread (buf, 1, len, f);
575 }
576
577 static int
_XcursorStdioFileWrite(XcursorFile * file,unsigned char * buf,int len)578 _XcursorStdioFileWrite (XcursorFile *file, unsigned char *buf, int len)
579 {
580 FILE *f = file->closure;
581 return fwrite (buf, 1, len, f);
582 }
583
584 static int
_XcursorStdioFileSeek(XcursorFile * file,long offset,int whence)585 _XcursorStdioFileSeek (XcursorFile *file, long offset, int whence)
586 {
587 FILE *f = file->closure;
588 return fseek (f, offset, whence);
589 }
590
591 static void
_XcursorStdioFileInitialize(FILE * stdfile,XcursorFile * file)592 _XcursorStdioFileInitialize (FILE *stdfile, XcursorFile *file)
593 {
594 file->closure = stdfile;
595 file->read = _XcursorStdioFileRead;
596 file->write = _XcursorStdioFileWrite;
597 file->seek = _XcursorStdioFileSeek;
598 }
599
600 static XcursorImages *
XcursorFileLoadImages(FILE * file,int size)601 XcursorFileLoadImages (FILE *file, int size)
602 {
603 XcursorFile f;
604
605 if (!file)
606 return NULL;
607
608 _XcursorStdioFileInitialize (file, &f);
609 return XcursorXcFileLoadImages (&f, size);
610 }
611
612 /*
613 * From libXcursor/src/library.c
614 */
615
616 #ifndef ICONDIR
617 #define ICONDIR "/usr/X11R6/lib/X11/icons"
618 #endif
619
620 #ifndef XCURSORPATH
621 #define XCURSORPATH "~/.icons:/usr/share/icons:/usr/share/pixmaps:~/.cursors:/usr/share/cursors/xorg-x11:"ICONDIR
622 #endif
623
624 static const char *
XcursorLibraryPath(void)625 XcursorLibraryPath (void)
626 {
627 static const char *path;
628
629 if (!path)
630 {
631 path = getenv ("XCURSOR_PATH");
632 if (!path)
633 path = XCURSORPATH;
634 }
635 return path;
636 }
637
638 static void
_XcursorAddPathElt(char * path,const char * elt,int len)639 _XcursorAddPathElt (char *path, const char *elt, int len)
640 {
641 int pathlen = strlen (path);
642
643 /* append / if the path doesn't currently have one */
644 if (path[0] == '\0' || path[pathlen - 1] != '/')
645 {
646 strcat (path, "/");
647 pathlen++;
648 }
649 if (len == -1)
650 len = strlen (elt);
651 /* strip leading slashes */
652 while (len && elt[0] == '/')
653 {
654 elt++;
655 len--;
656 }
657 strncpy (path + pathlen, elt, len);
658 path[pathlen + len] = '\0';
659 }
660
661 static char *
_XcursorBuildThemeDir(const char * dir,const char * theme)662 _XcursorBuildThemeDir (const char *dir, const char *theme)
663 {
664 const char *colon;
665 const char *tcolon;
666 char *full;
667 char *home;
668 int dirlen;
669 int homelen;
670 int themelen;
671 int len;
672
673 if (!dir || !theme)
674 return NULL;
675
676 colon = strchr (dir, ':');
677 if (!colon)
678 colon = dir + strlen (dir);
679
680 dirlen = colon - dir;
681
682 tcolon = strchr (theme, ':');
683 if (!tcolon)
684 tcolon = theme + strlen (theme);
685
686 themelen = tcolon - theme;
687
688 home = NULL;
689 homelen = 0;
690 if (*dir == '~')
691 {
692 home = getenv ("HOME");
693 if (!home)
694 return NULL;
695 homelen = strlen (home);
696 dir++;
697 dirlen--;
698 }
699
700 /*
701 * add space for any needed directory separators, one per component,
702 * and one for the trailing null
703 */
704 len = 1 + homelen + 1 + dirlen + 1 + themelen + 1;
705
706 full = malloc (len);
707 if (!full)
708 return NULL;
709 full[0] = '\0';
710
711 if (home)
712 _XcursorAddPathElt (full, home, -1);
713 _XcursorAddPathElt (full, dir, dirlen);
714 _XcursorAddPathElt (full, theme, themelen);
715 return full;
716 }
717
718 static char *
_XcursorBuildFullname(const char * dir,const char * subdir,const char * file)719 _XcursorBuildFullname (const char *dir, const char *subdir, const char *file)
720 {
721 char *full;
722
723 if (!dir || !subdir || !file)
724 return NULL;
725
726 full = malloc (strlen (dir) + 1 + strlen (subdir) + 1 + strlen (file) + 1);
727 if (!full)
728 return NULL;
729 full[0] = '\0';
730 _XcursorAddPathElt (full, dir, -1);
731 _XcursorAddPathElt (full, subdir, -1);
732 _XcursorAddPathElt (full, file, -1);
733 return full;
734 }
735
736 static const char *
_XcursorNextPath(const char * path)737 _XcursorNextPath (const char *path)
738 {
739 char *colon = strchr (path, ':');
740
741 if (!colon)
742 return NULL;
743 return colon + 1;
744 }
745
746 #define XcursorWhite(c) ((c) == ' ' || (c) == '\t' || (c) == '\n')
747 #define XcursorSep(c) ((c) == ';' || (c) == ',')
748
749 static char *
_XcursorThemeInherits(const char * full)750 _XcursorThemeInherits (const char *full)
751 {
752 char line[8192];
753 char *result = NULL;
754 FILE *f;
755
756 if (!full)
757 return NULL;
758
759 f = fopen (full, "r");
760 if (f)
761 {
762 while (fgets (line, sizeof (line), f))
763 {
764 if (!strncmp (line, "Inherits", 8))
765 {
766 char *l = line + 8;
767 char *r;
768 while (*l == ' ') l++;
769 if (*l != '=') continue;
770 l++;
771 while (*l == ' ') l++;
772 result = malloc (strlen (l) + 1);
773 if (result)
774 {
775 r = result;
776 while (*l)
777 {
778 while (XcursorSep(*l) || XcursorWhite (*l)) l++;
779 if (!*l)
780 break;
781 if (r != result)
782 *r++ = ':';
783 while (*l && !XcursorWhite(*l) &&
784 !XcursorSep(*l))
785 *r++ = *l++;
786 }
787 *r++ = '\0';
788 }
789 break;
790 }
791 }
792 fclose (f);
793 }
794 return result;
795 }
796
797 static FILE *
XcursorScanTheme(const char * theme,const char * name)798 XcursorScanTheme (const char *theme, const char *name)
799 {
800 FILE *f = NULL;
801 char *full;
802 char *dir;
803 const char *path;
804 char *inherits = NULL;
805 const char *i;
806
807 if (!theme || !name)
808 return NULL;
809
810 /*
811 * Scan this theme
812 */
813 for (path = XcursorLibraryPath ();
814 path && f == NULL;
815 path = _XcursorNextPath (path))
816 {
817 dir = _XcursorBuildThemeDir (path, theme);
818 if (dir)
819 {
820 full = _XcursorBuildFullname (dir, "cursors", name);
821 if (full)
822 {
823 f = fopen (full, "r");
824 free (full);
825 }
826 if (!f && !inherits)
827 {
828 full = _XcursorBuildFullname (dir, "", "index.theme");
829 if (full)
830 {
831 inherits = _XcursorThemeInherits (full);
832 free (full);
833 }
834 }
835 free (dir);
836 }
837 }
838 /*
839 * Recurse to scan inherited themes
840 */
841 for (i = inherits; i && f == NULL; i = _XcursorNextPath (i))
842 f = XcursorScanTheme (i, name);
843 if (inherits != NULL)
844 free (inherits);
845 return f;
846 }
847
848 XcursorImages *
XcursorLibraryLoadImages(const char * file,const char * theme,int size)849 XcursorLibraryLoadImages (const char *file, const char *theme, int size)
850 {
851 FILE *f = NULL;
852 XcursorImages *images = NULL;
853
854 if (!file)
855 return NULL;
856
857 if (theme)
858 f = XcursorScanTheme (theme, file);
859 if (!f)
860 f = XcursorScanTheme ("default", file);
861 if (f)
862 {
863 images = XcursorFileLoadImages (f, size);
864 if (images)
865 XcursorImagesSetName (images, file);
866 fclose (f);
867 }
868 return images;
869 }
870
871 static void
load_all_cursors_from_dir(const char * path,int size,void (* load_callback)(XcursorImages *,void *),void * user_data)872 load_all_cursors_from_dir(const char *path, int size,
873 void (*load_callback)(XcursorImages *, void *),
874 void *user_data)
875 {
876 FILE *f;
877 DIR *dir = opendir(path);
878 struct dirent *ent;
879 char *full;
880 XcursorImages *images;
881
882 if (!dir)
883 return;
884
885 for(ent = readdir(dir); ent; ent = readdir(dir)) {
886 #ifdef _DIRENT_HAVE_D_TYPE
887 if (ent->d_type != DT_UNKNOWN &&
888 (ent->d_type != DT_REG && ent->d_type != DT_LNK))
889 continue;
890 #endif
891
892 full = _XcursorBuildFullname(path, "", ent->d_name);
893 if (!full)
894 continue;
895
896 f = fopen(full, "r");
897 if (!f) {
898 free(full);
899 continue;
900 }
901
902 images = XcursorFileLoadImages(f, size);
903
904 if (images) {
905 XcursorImagesSetName(images, ent->d_name);
906 load_callback(images, user_data);
907 }
908
909 fclose (f);
910 free(full);
911 }
912
913 closedir(dir);
914 }
915
916 /** Load all the cursor of a theme
917 *
918 * This function loads all the cursor images of a given theme and its
919 * inherited themes. Each cursor is loaded into an XcursorImages object
920 * which is passed to the caller's load callback. If a cursor appears
921 * more than once across all the inherited themes, the load callback
922 * will be called multiple times, with possibly different XcursorImages
923 * object which have the same name. The user is expected to destroy the
924 * XcursorImages objects passed to the callback with
925 * XcursorImagesDestroy().
926 *
927 * \param theme The name of theme that should be loaded
928 * \param size The desired size of the cursor images
929 * \param load_callback A callback function that will be called
930 * for each cursor loaded. The first parameter is the XcursorImages
931 * object representing the loaded cursor and the second is a pointer
932 * to data provided by the user.
933 * \param user_data The data that should be passed to the load callback
934 */
935 void
xcursor_load_theme(const char * theme,int size,void (* load_callback)(XcursorImages *,void *),void * user_data)936 xcursor_load_theme(const char *theme, int size,
937 void (*load_callback)(XcursorImages *, void *),
938 void *user_data)
939 {
940 char *full, *dir;
941 char *inherits = NULL;
942 const char *path, *i;
943
944 if (!theme)
945 theme = "default";
946
947 for (path = XcursorLibraryPath();
948 path;
949 path = _XcursorNextPath(path)) {
950 dir = _XcursorBuildThemeDir(path, theme);
951 if (!dir)
952 continue;
953
954 full = _XcursorBuildFullname(dir, "cursors", "");
955
956 if (full) {
957 load_all_cursors_from_dir(full, size, load_callback,
958 user_data);
959 free(full);
960 }
961
962 if (!inherits) {
963 full = _XcursorBuildFullname(dir, "", "index.theme");
964 if (full) {
965 inherits = _XcursorThemeInherits(full);
966 free(full);
967 }
968 }
969
970 free(dir);
971 }
972
973 for (i = inherits; i; i = _XcursorNextPath(i))
974 xcursor_load_theme(i, size, load_callback, user_data);
975
976 if (inherits)
977 free(inherits);
978 }
979