1 /*
2 * Copyright © 2009 Red Hat, Inc.
3 * Copyright © 2018 Ebrahim Byagowi
4 *
5 * This is part of HarfBuzz, a text shaping library.
6 *
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
12 *
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17 * DAMAGE.
18 *
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 *
25 * Red Hat Author(s): Behdad Esfahbod
26 */
27
28 #include "hb.hh"
29 #include "hb-blob.hh"
30
31 #ifdef HAVE_SYS_MMAN_H
32 #ifdef HAVE_UNISTD_H
33 #include <unistd.h>
34 #endif /* HAVE_UNISTD_H */
35 #include <sys/mman.h>
36 #endif /* HAVE_SYS_MMAN_H */
37
38
39 /**
40 * SECTION: hb-blob
41 * @title: hb-blob
42 * @short_description: Binary data containers
43 * @include: hb.h
44 *
45 * Blobs wrap a chunk of binary data to handle lifecycle management of data
46 * while it is passed between client and HarfBuzz. Blobs are primarily used
47 * to create font faces, but also to access font face tables, as well as
48 * pass around other binary data.
49 **/
50
51
52 /**
53 * hb_blob_create: (skip)
54 * @data: Pointer to blob data.
55 * @length: Length of @data in bytes.
56 * @mode: Memory mode for @data.
57 * @user_data: Data parameter to pass to @destroy.
58 * @destroy: (nullable): Callback to call when @data is not needed anymore.
59 *
60 * Creates a new "blob" object wrapping @data. The @mode parameter is used
61 * to negotiate ownership and lifecycle of @data.
62 *
63 * Return value: New blob, or the empty blob if something failed or if @length is
64 * zero. Destroy with hb_blob_destroy().
65 *
66 * Since: 0.9.2
67 **/
68 hb_blob_t *
hb_blob_create(const char * data,unsigned int length,hb_memory_mode_t mode,void * user_data,hb_destroy_func_t destroy)69 hb_blob_create (const char *data,
70 unsigned int length,
71 hb_memory_mode_t mode,
72 void *user_data,
73 hb_destroy_func_t destroy)
74 {
75 hb_blob_t *blob;
76
77 if (!length ||
78 length >= 1u << 31 ||
79 !(blob = hb_object_create<hb_blob_t> ())) {
80 if (destroy)
81 destroy (user_data);
82 return hb_blob_get_empty ();
83 }
84
85 blob->data = data;
86 blob->length = length;
87 blob->mode = mode;
88
89 blob->user_data = user_data;
90 blob->destroy = destroy;
91
92 if (blob->mode == HB_MEMORY_MODE_DUPLICATE) {
93 blob->mode = HB_MEMORY_MODE_READONLY;
94 if (!blob->try_make_writable ()) {
95 hb_blob_destroy (blob);
96 return hb_blob_get_empty ();
97 }
98 }
99
100 return blob;
101 }
102
103 static void
_hb_blob_destroy(void * data)104 _hb_blob_destroy (void *data)
105 {
106 hb_blob_destroy ((hb_blob_t *) data);
107 }
108
109 /**
110 * hb_blob_create_sub_blob:
111 * @parent: Parent blob.
112 * @offset: Start offset of sub-blob within @parent, in bytes.
113 * @length: Length of sub-blob.
114 *
115 * Returns a blob that represents a range of bytes in @parent. The new
116 * blob is always created with #HB_MEMORY_MODE_READONLY, meaning that it
117 * will never modify data in the parent blob. The parent data is not
118 * expected to be modified, and will result in undefined behavior if it
119 * is.
120 *
121 * Makes @parent immutable.
122 *
123 * Return value: New blob, or the empty blob if something failed or if
124 * @length is zero or @offset is beyond the end of @parent's data. Destroy
125 * with hb_blob_destroy().
126 *
127 * Since: 0.9.2
128 **/
129 hb_blob_t *
hb_blob_create_sub_blob(hb_blob_t * parent,unsigned int offset,unsigned int length)130 hb_blob_create_sub_blob (hb_blob_t *parent,
131 unsigned int offset,
132 unsigned int length)
133 {
134 hb_blob_t *blob;
135
136 if (!length || !parent || offset >= parent->length)
137 return hb_blob_get_empty ();
138
139 hb_blob_make_immutable (parent);
140
141 blob = hb_blob_create (parent->data + offset,
142 hb_min (length, parent->length - offset),
143 HB_MEMORY_MODE_READONLY,
144 hb_blob_reference (parent),
145 _hb_blob_destroy);
146
147 return blob;
148 }
149
150 /**
151 * hb_blob_copy_writable_or_fail:
152 * @blob: A blob.
153 *
154 * Makes a writable copy of @blob.
155 *
156 * Return value: The new blob, or nullptr if allocation failed
157 *
158 * Since: 1.8.0
159 **/
160 hb_blob_t *
hb_blob_copy_writable_or_fail(hb_blob_t * blob)161 hb_blob_copy_writable_or_fail (hb_blob_t *blob)
162 {
163 blob = hb_blob_create (blob->data,
164 blob->length,
165 HB_MEMORY_MODE_DUPLICATE,
166 nullptr,
167 nullptr);
168
169 if (unlikely (blob == hb_blob_get_empty ()))
170 blob = nullptr;
171
172 return blob;
173 }
174
175 /**
176 * hb_blob_get_empty:
177 *
178 * Returns the singleton empty blob.
179 *
180 * See TODO:link object types for more information.
181 *
182 * Return value: (transfer full): The empty blob.
183 *
184 * Since: 0.9.2
185 **/
186 hb_blob_t *
hb_blob_get_empty()187 hb_blob_get_empty ()
188 {
189 return const_cast<hb_blob_t *> (&Null (hb_blob_t));
190 }
191
192 /**
193 * hb_blob_reference: (skip)
194 * @blob: a blob.
195 *
196 * Increases the reference count on @blob.
197 *
198 * See TODO:link object types for more information.
199 *
200 * Return value: @blob.
201 *
202 * Since: 0.9.2
203 **/
204 hb_blob_t *
hb_blob_reference(hb_blob_t * blob)205 hb_blob_reference (hb_blob_t *blob)
206 {
207 return hb_object_reference (blob);
208 }
209
210 /**
211 * hb_blob_destroy: (skip)
212 * @blob: a blob.
213 *
214 * Decreases the reference count on @blob, and if it reaches zero, destroys
215 * @blob, freeing all memory, possibly calling the destroy-callback the blob
216 * was created for if it has not been called already.
217 *
218 * See TODO:link object types for more information.
219 *
220 * Since: 0.9.2
221 **/
222 void
hb_blob_destroy(hb_blob_t * blob)223 hb_blob_destroy (hb_blob_t *blob)
224 {
225 if (!hb_object_destroy (blob)) return;
226
227 blob->fini_shallow ();
228
229 free (blob);
230 }
231
232 /**
233 * hb_blob_set_user_data: (skip)
234 * @blob: An #hb_blob_t
235 * @key: The user-data key to set
236 * @data: A pointer to the user data to set
237 * @destroy: (nullable): A callback to call when @data is not needed anymore
238 * @replace: Whether to replace an existing data with the same key
239 *
240 * Attaches a user-data key/data pair to the specified blob.
241 *
242 * Return value: %true if success, %false otherwise
243 *
244 * Since: 0.9.2
245 **/
246 hb_bool_t
hb_blob_set_user_data(hb_blob_t * blob,hb_user_data_key_t * key,void * data,hb_destroy_func_t destroy,hb_bool_t replace)247 hb_blob_set_user_data (hb_blob_t *blob,
248 hb_user_data_key_t *key,
249 void * data,
250 hb_destroy_func_t destroy,
251 hb_bool_t replace)
252 {
253 return hb_object_set_user_data (blob, key, data, destroy, replace);
254 }
255
256 /**
257 * hb_blob_get_user_data: (skip)
258 * @blob: a blob
259 * @key: The user-data key to query
260 *
261 * Fetches the user data associated with the specified key,
262 * attached to the specified font-functions structure.
263 *
264 * Return value: (transfer none): A pointer to the user data
265 *
266 * Since: 0.9.2
267 **/
268 void *
hb_blob_get_user_data(hb_blob_t * blob,hb_user_data_key_t * key)269 hb_blob_get_user_data (hb_blob_t *blob,
270 hb_user_data_key_t *key)
271 {
272 return hb_object_get_user_data (blob, key);
273 }
274
275
276 /**
277 * hb_blob_make_immutable:
278 * @blob: a blob
279 *
280 * Makes a blob immutable.
281 *
282 * Since: 0.9.2
283 **/
284 void
hb_blob_make_immutable(hb_blob_t * blob)285 hb_blob_make_immutable (hb_blob_t *blob)
286 {
287 if (hb_object_is_immutable (blob))
288 return;
289
290 hb_object_make_immutable (blob);
291 }
292
293 /**
294 * hb_blob_is_immutable:
295 * @blob: a blob.
296 *
297 * Tests whether a blob is immutable.
298 *
299 * Return value: %true if @blob is immutable, %false otherwise
300 *
301 * Since: 0.9.2
302 **/
303 hb_bool_t
hb_blob_is_immutable(hb_blob_t * blob)304 hb_blob_is_immutable (hb_blob_t *blob)
305 {
306 return hb_object_is_immutable (blob);
307 }
308
309
310 /**
311 * hb_blob_get_length:
312 * @blob: a blob.
313 *
314 * Fetches the length of a blob's data.
315 *
316 * Return value: the length of @blob data in bytes.
317 *
318 * Since: 0.9.2
319 **/
320 unsigned int
hb_blob_get_length(hb_blob_t * blob)321 hb_blob_get_length (hb_blob_t *blob)
322 {
323 return blob->length;
324 }
325
326 /**
327 * hb_blob_get_data:
328 * @blob: a blob.
329 * @length: (out): The length in bytes of the data retrieved
330 *
331 * Fetches the data from a blob.
332 *
333 * Returns: (transfer none) (array length=length): the byte data of @blob.
334 *
335 * Since: 0.9.2
336 **/
337 const char *
hb_blob_get_data(hb_blob_t * blob,unsigned int * length)338 hb_blob_get_data (hb_blob_t *blob, unsigned int *length)
339 {
340 if (length)
341 *length = blob->length;
342
343 return blob->data;
344 }
345
346 /**
347 * hb_blob_get_data_writable:
348 * @blob: a blob.
349 * @length: (out): output length of the writable data.
350 *
351 * Tries to make blob data writable (possibly copying it) and
352 * return pointer to data.
353 *
354 * Fails if blob has been made immutable, or if memory allocation
355 * fails.
356 *
357 * Returns: (transfer none) (array length=length): Writable blob data,
358 * or %NULL if failed.
359 *
360 * Since: 0.9.2
361 **/
362 char *
hb_blob_get_data_writable(hb_blob_t * blob,unsigned int * length)363 hb_blob_get_data_writable (hb_blob_t *blob, unsigned int *length)
364 {
365 if (hb_object_is_immutable (blob) ||
366 !blob->try_make_writable ())
367 {
368 if (length) *length = 0;
369 return nullptr;
370 }
371
372 if (length) *length = blob->length;
373 return const_cast<char *> (blob->data);
374 }
375
376
377 bool
try_make_writable_inplace_unix()378 hb_blob_t::try_make_writable_inplace_unix ()
379 {
380 #if defined(HAVE_SYS_MMAN_H) && defined(HAVE_MPROTECT)
381 uintptr_t pagesize = -1, mask, length;
382 const char *addr;
383
384 #if defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
385 pagesize = (uintptr_t) sysconf (_SC_PAGE_SIZE);
386 #elif defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
387 pagesize = (uintptr_t) sysconf (_SC_PAGESIZE);
388 #elif defined(HAVE_GETPAGESIZE)
389 pagesize = (uintptr_t) getpagesize ();
390 #endif
391
392 if ((uintptr_t) -1L == pagesize) {
393 DEBUG_MSG_FUNC (BLOB, this, "failed to get pagesize: %s", strerror (errno));
394 return false;
395 }
396 DEBUG_MSG_FUNC (BLOB, this, "pagesize is %lu", (unsigned long) pagesize);
397
398 mask = ~(pagesize-1);
399 addr = (const char *) (((uintptr_t) this->data) & mask);
400 length = (const char *) (((uintptr_t) this->data + this->length + pagesize-1) & mask) - addr;
401 DEBUG_MSG_FUNC (BLOB, this,
402 "calling mprotect on [%p..%p] (%lu bytes)",
403 addr, addr+length, (unsigned long) length);
404 if (-1 == mprotect ((void *) addr, length, PROT_READ | PROT_WRITE)) {
405 DEBUG_MSG_FUNC (BLOB, this, "mprotect failed: %s", strerror (errno));
406 return false;
407 }
408
409 this->mode = HB_MEMORY_MODE_WRITABLE;
410
411 DEBUG_MSG_FUNC (BLOB, this,
412 "successfully made [%p..%p] (%lu bytes) writable\n",
413 addr, addr+length, (unsigned long) length);
414 return true;
415 #else
416 return false;
417 #endif
418 }
419
420 bool
try_make_writable_inplace()421 hb_blob_t::try_make_writable_inplace ()
422 {
423 DEBUG_MSG_FUNC (BLOB, this, "making writable inplace\n");
424
425 if (this->try_make_writable_inplace_unix ())
426 return true;
427
428 DEBUG_MSG_FUNC (BLOB, this, "making writable -> FAILED\n");
429
430 /* Failed to make writable inplace, mark that */
431 this->mode = HB_MEMORY_MODE_READONLY;
432 return false;
433 }
434
435 bool
try_make_writable()436 hb_blob_t::try_make_writable ()
437 {
438 if (unlikely (!length))
439 mode = HB_MEMORY_MODE_WRITABLE;
440
441 if (this->mode == HB_MEMORY_MODE_WRITABLE)
442 return true;
443
444 if (this->mode == HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE && this->try_make_writable_inplace ())
445 return true;
446
447 if (this->mode == HB_MEMORY_MODE_WRITABLE)
448 return true;
449
450
451 DEBUG_MSG_FUNC (BLOB, this, "current data is -> %p\n", this->data);
452
453 char *new_data;
454
455 new_data = (char *) malloc (this->length);
456 if (unlikely (!new_data))
457 return false;
458
459 DEBUG_MSG_FUNC (BLOB, this, "dupped successfully -> %p\n", this->data);
460
461 memcpy (new_data, this->data, this->length);
462 this->destroy_user_data ();
463 this->mode = HB_MEMORY_MODE_WRITABLE;
464 this->data = new_data;
465 this->user_data = new_data;
466 this->destroy = free;
467
468 return true;
469 }
470
471 /*
472 * Mmap
473 */
474
475 #ifndef HB_NO_OPEN
476 #ifdef HAVE_MMAP
477 # if !defined(HB_NO_RESOURCE_FORK) && defined(__APPLE__)
478 # include <sys/paths.h>
479 # endif
480 # include <sys/types.h>
481 # include <sys/stat.h>
482 # include <fcntl.h>
483 #endif
484
485 #ifdef _WIN32
486 # include <windows.h>
487 #else
488 # ifndef O_BINARY
489 # define O_BINARY 0
490 # endif
491 #endif
492
493 #ifndef MAP_NORESERVE
494 # define MAP_NORESERVE 0
495 #endif
496
497 struct hb_mapped_file_t
498 {
499 char *contents;
500 unsigned long length;
501 #ifdef _WIN32
502 HANDLE mapping;
503 #endif
504 };
505
506 #if (defined(HAVE_MMAP) || defined(_WIN32)) && !defined(HB_NO_MMAP)
507 static void
_hb_mapped_file_destroy(void * file_)508 _hb_mapped_file_destroy (void *file_)
509 {
510 hb_mapped_file_t *file = (hb_mapped_file_t *) file_;
511 #ifdef HAVE_MMAP
512 munmap (file->contents, file->length);
513 #elif defined(_WIN32)
514 UnmapViewOfFile (file->contents);
515 CloseHandle (file->mapping);
516 #else
517 assert (0); // If we don't have mmap we shouldn't reach here
518 #endif
519
520 free (file);
521 }
522 #endif
523
524 #ifdef _PATH_RSRCFORKSPEC
525 static int
_open_resource_fork(const char * file_name,hb_mapped_file_t * file)526 _open_resource_fork (const char *file_name, hb_mapped_file_t *file)
527 {
528 size_t name_len = strlen (file_name);
529 size_t len = name_len + sizeof (_PATH_RSRCFORKSPEC);
530
531 char *rsrc_name = (char *) malloc (len);
532 if (unlikely (!rsrc_name)) return -1;
533
534 strncpy (rsrc_name, file_name, name_len);
535 strncpy (rsrc_name + name_len, _PATH_RSRCFORKSPEC,
536 sizeof (_PATH_RSRCFORKSPEC) - 1);
537
538 int fd = open (rsrc_name, O_RDONLY | O_BINARY, 0);
539 free (rsrc_name);
540
541 if (fd != -1)
542 {
543 struct stat st;
544 if (fstat (fd, &st) != -1)
545 file->length = (unsigned long) st.st_size;
546 else
547 {
548 close (fd);
549 fd = -1;
550 }
551 }
552
553 return fd;
554 }
555 #endif
556
557 /**
558 * hb_blob_create_from_file:
559 * @file_name: A font filename
560 *
561 * Creates a new blob containing the data from the
562 * specified binary font file.
563 *
564 * Returns: An #hb_blob_t pointer with the content of the file
565 *
566 * Since: 1.7.7
567 **/
568 hb_blob_t *
hb_blob_create_from_file(const char * file_name)569 hb_blob_create_from_file (const char *file_name)
570 {
571 /* Adopted from glib's gmappedfile.c with Matthias Clasen and
572 Allison Lortie permission but changed a lot to suit our need. */
573 #if defined(HAVE_MMAP) && !defined(HB_NO_MMAP)
574 hb_mapped_file_t *file = (hb_mapped_file_t *) calloc (1, sizeof (hb_mapped_file_t));
575 if (unlikely (!file)) return hb_blob_get_empty ();
576
577 int fd = open (file_name, O_RDONLY | O_BINARY, 0);
578 if (unlikely (fd == -1)) goto fail_without_close;
579
580 struct stat st;
581 if (unlikely (fstat (fd, &st) == -1)) goto fail;
582
583 file->length = (unsigned long) st.st_size;
584
585 #ifdef _PATH_RSRCFORKSPEC
586 if (unlikely (file->length == 0))
587 {
588 int rfd = _open_resource_fork (file_name, file);
589 if (rfd != -1)
590 {
591 close (fd);
592 fd = rfd;
593 }
594 }
595 #endif
596
597 file->contents = (char *) mmap (nullptr, file->length, PROT_READ,
598 MAP_PRIVATE | MAP_NORESERVE, fd, 0);
599
600 if (unlikely (file->contents == MAP_FAILED)) goto fail;
601
602 close (fd);
603
604 return hb_blob_create (file->contents, file->length,
605 HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE, (void *) file,
606 (hb_destroy_func_t) _hb_mapped_file_destroy);
607
608 fail:
609 close (fd);
610 fail_without_close:
611 free (file);
612
613 #elif defined(_WIN32) && !defined(HB_NO_MMAP)
614 hb_mapped_file_t *file = (hb_mapped_file_t *) calloc (1, sizeof (hb_mapped_file_t));
615 if (unlikely (!file)) return hb_blob_get_empty ();
616
617 HANDLE fd;
618 unsigned int size = strlen (file_name) + 1;
619 wchar_t * wchar_file_name = (wchar_t *) malloc (sizeof (wchar_t) * size);
620 if (unlikely (!wchar_file_name)) goto fail_without_close;
621 mbstowcs (wchar_file_name, file_name, size);
622 #if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
623 {
624 CREATEFILE2_EXTENDED_PARAMETERS ceparams = { 0 };
625 ceparams.dwSize = sizeof(CREATEFILE2_EXTENDED_PARAMETERS);
626 ceparams.dwFileAttributes = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED & 0xFFFF;
627 ceparams.dwFileFlags = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED & 0xFFF00000;
628 ceparams.dwSecurityQosFlags = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED & 0x000F0000;
629 ceparams.lpSecurityAttributes = nullptr;
630 ceparams.hTemplateFile = nullptr;
631 fd = CreateFile2 (wchar_file_name, GENERIC_READ, FILE_SHARE_READ,
632 OPEN_EXISTING, &ceparams);
633 }
634 #else
635 fd = CreateFileW (wchar_file_name, GENERIC_READ, FILE_SHARE_READ, nullptr,
636 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,
637 nullptr);
638 #endif
639 free (wchar_file_name);
640
641 if (unlikely (fd == INVALID_HANDLE_VALUE)) goto fail_without_close;
642
643 #if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
644 {
645 LARGE_INTEGER length;
646 GetFileSizeEx (fd, &length);
647 file->length = length.LowPart;
648 file->mapping = CreateFileMappingFromApp (fd, nullptr, PAGE_READONLY, length.QuadPart, nullptr);
649 }
650 #else
651 file->length = (unsigned long) GetFileSize (fd, nullptr);
652 file->mapping = CreateFileMapping (fd, nullptr, PAGE_READONLY, 0, 0, nullptr);
653 #endif
654 if (unlikely (!file->mapping)) goto fail;
655
656 #if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
657 file->contents = (char *) MapViewOfFileFromApp (file->mapping, FILE_MAP_READ, 0, 0);
658 #else
659 file->contents = (char *) MapViewOfFile (file->mapping, FILE_MAP_READ, 0, 0, 0);
660 #endif
661 if (unlikely (!file->contents)) goto fail;
662
663 CloseHandle (fd);
664 return hb_blob_create (file->contents, file->length,
665 HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE, (void *) file,
666 (hb_destroy_func_t) _hb_mapped_file_destroy);
667
668 fail:
669 CloseHandle (fd);
670 fail_without_close:
671 free (file);
672
673 #endif
674
675 /* The following tries to read a file without knowing its size beforehand
676 It's used as a fallback for systems without mmap or to read from pipes */
677 unsigned long len = 0, allocated = BUFSIZ * 16;
678 char *data = (char *) malloc (allocated);
679 if (unlikely (!data)) return hb_blob_get_empty ();
680
681 FILE *fp = fopen (file_name, "rb");
682 if (unlikely (!fp)) goto fread_fail_without_close;
683
684 while (!feof (fp))
685 {
686 if (allocated - len < BUFSIZ)
687 {
688 allocated *= 2;
689 /* Don't allocate and go more than ~536MB, our mmap reader still
690 can cover files like that but lets limit our fallback reader */
691 if (unlikely (allocated > (2 << 28))) goto fread_fail;
692 char *new_data = (char *) realloc (data, allocated);
693 if (unlikely (!new_data)) goto fread_fail;
694 data = new_data;
695 }
696
697 unsigned long addition = fread (data + len, 1, allocated - len, fp);
698
699 int err = ferror (fp);
700 #ifdef EINTR // armcc doesn't have it
701 if (unlikely (err == EINTR)) continue;
702 #endif
703 if (unlikely (err)) goto fread_fail;
704
705 len += addition;
706 }
707 fclose (fp);
708
709 return hb_blob_create (data, len, HB_MEMORY_MODE_WRITABLE, data,
710 (hb_destroy_func_t) free);
711
712 fread_fail:
713 fclose (fp);
714 fread_fail_without_close:
715 free (data);
716 return hb_blob_get_empty ();
717 }
718 #endif /* !HB_NO_OPEN */
719