2
* Copyright (C) 2009 Red Hat, Inc.
4
* This is part of HarfBuzz, an OpenType Layout engine library.
6
* Permission is hereby granted, without written agreement and without
7
* license or royalty fees, to use, copy, modify, and distribute this
8
* software and its documentation for any purpose, provided that the
9
* above copyright notice and the following two paragraphs appear in
10
* all copies of this software.
12
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24
* Red Hat Author(s): Behdad Esfahbod
27
#include "hb-private.h"
31
#ifdef HAVE_SYS_MMAN_H
34
#endif /* HAVE_UNISTD_H */
36
#endif /* HAVE_SYS_MMAN_H */
39
#define HB_DEBUG_BLOB HB_DEBUG
43
hb_reference_count_t ref_count;
48
/* the rest are protected by lock */
50
unsigned int lock_count;
51
hb_memory_mode_t mode;
55
hb_destroy_func_t destroy;
58
static hb_blob_t _hb_blob_nil = {
59
HB_REFERENCE_COUNT_INVALID, /* ref_count */
63
HB_MUTEX_INIT, /* lock */
66
HB_MEMORY_MODE_READONLY, /* mode */
75
_hb_blob_destroy_user_data (hb_blob_t *blob)
78
blob->destroy (blob->user_data);
80
blob->user_data = NULL;
85
_hb_blob_unlock_and_destroy (hb_blob_t *blob)
87
hb_blob_unlock (blob);
88
hb_blob_destroy (blob);
92
hb_blob_create (const char *data,
94
hb_memory_mode_t mode,
95
hb_destroy_func_t destroy,
100
if (!length || !HB_OBJECT_DO_CREATE (hb_blob_t, blob)) {
103
return &_hb_blob_nil;
106
hb_mutex_init (blob->lock);
107
blob->lock_count = 0;
110
blob->length = length;
113
blob->destroy = destroy;
114
blob->user_data = user_data;
116
if (blob->mode == HB_MEMORY_MODE_DUPLICATE) {
117
blob->mode = HB_MEMORY_MODE_READONLY;
118
if (!hb_blob_try_writable (blob)) {
119
hb_blob_destroy (blob);
120
return &_hb_blob_nil;
128
hb_blob_create_sub_blob (hb_blob_t *parent,
135
if (!length || offset >= parent->length || !HB_OBJECT_DO_CREATE (hb_blob_t, blob))
136
return &_hb_blob_nil;
138
pdata = hb_blob_lock (parent);
140
blob->data = pdata + offset;
141
blob->length = MIN (length, parent->length - offset);
143
hb_mutex_lock (parent->lock);
144
blob->mode = parent->mode;
145
hb_mutex_unlock (parent->lock);
147
blob->destroy = (hb_destroy_func_t) _hb_blob_unlock_and_destroy;
148
blob->user_data = hb_blob_reference (parent);
154
hb_blob_create_empty (void)
156
return &_hb_blob_nil;
160
hb_blob_reference (hb_blob_t *blob)
162
HB_OBJECT_DO_REFERENCE (blob);
166
hb_blob_get_reference_count (hb_blob_t *blob)
168
HB_OBJECT_DO_GET_REFERENCE_COUNT (blob);
172
hb_blob_destroy (hb_blob_t *blob)
174
HB_OBJECT_DO_DESTROY (blob);
176
_hb_blob_destroy_user_data (blob);
182
hb_blob_get_length (hb_blob_t *blob)
188
hb_blob_lock (hb_blob_t *blob)
190
if (HB_OBJECT_IS_INERT (blob))
193
hb_mutex_lock (blob->lock);
197
fprintf (stderr, "%p %s (%d) -> %p\n", blob, __FUNCTION__,
198
blob->lock_count, blob->data);
201
hb_mutex_unlock (blob->lock);
207
hb_blob_unlock (hb_blob_t *blob)
209
if (HB_OBJECT_IS_INERT (blob))
212
hb_mutex_lock (blob->lock);
214
assert (blob->lock_count > 0);
217
fprintf (stderr, "%p %s (%d) -> %p\n", blob, __FUNCTION__,
218
hb_atomic_int_get (blob->lock_count), blob->data);
221
hb_mutex_unlock (blob->lock);
225
hb_blob_is_writable (hb_blob_t *blob)
227
hb_memory_mode_t mode;
229
if (HB_OBJECT_IS_INERT (blob))
232
hb_mutex_lock (blob->lock);
236
hb_mutex_unlock (blob->lock);
238
return mode == HB_MEMORY_MODE_WRITABLE;
243
_try_make_writable_inplace_unix_locked (hb_blob_t *blob)
245
#if defined(HAVE_SYS_MMAN_H) && defined(HAVE_MPROTECT)
246
uintptr_t pagesize = -1, mask, length;
249
#if defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
250
pagesize = (uintptr_t) sysconf (_SC_PAGE_SIZE);
251
#elif defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
252
pagesize = (uintptr_t) sysconf (_SC_PAGESIZE);
253
#elif defined(HAVE_GETPAGESIZE)
254
pagesize = (uintptr_t) getpagesize ();
257
if ((uintptr_t) -1L == pagesize) {
259
fprintf (stderr, "%p %s: failed to get pagesize: %s\n", blob, __FUNCTION__, strerror (errno));
264
fprintf (stderr, "%p %s: pagesize is %u\n", blob, __FUNCTION__, pagesize);
267
mask = ~(pagesize-1);
268
addr = (const char *) (((uintptr_t) blob->data) & mask);
269
length = (const char *) (((uintptr_t) blob->data + blob->length + pagesize-1) & mask) - addr;
271
fprintf (stderr, "%p %s: calling mprotect on [%p..%p] (%d bytes)\n",
273
addr, addr+length, length);
275
if (-1 == mprotect ((void *) addr, length, PROT_READ | PROT_WRITE)) {
277
fprintf (stderr, "%p %s: %s\n", blob, __FUNCTION__, strerror (errno));
283
fprintf (stderr, "%p %s: successfully made [%p..%p] (%d bytes) writable\n",
285
addr, addr+length, length);
294
_try_writable_inplace_locked (hb_blob_t *blob)
297
fprintf (stderr, "%p %s: making writable\n", blob, __FUNCTION__);
300
if (_try_make_writable_inplace_unix_locked (blob)) {
302
fprintf (stderr, "%p %s: making writable -> succeeded\n", blob, __FUNCTION__);
304
blob->mode = HB_MEMORY_MODE_WRITABLE;
307
fprintf (stderr, "%p %s: making writable -> FAILED\n", blob, __FUNCTION__);
309
/* Failed to make writable inplace, mark that */
310
blob->mode = HB_MEMORY_MODE_READONLY;
315
hb_blob_try_writable_inplace (hb_blob_t *blob)
317
hb_memory_mode_t mode;
319
if (HB_OBJECT_IS_INERT (blob))
322
hb_mutex_lock (blob->lock);
324
if (blob->mode == HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE)
325
_try_writable_inplace_locked (blob);
329
hb_mutex_unlock (blob->lock);
331
return mode == HB_MEMORY_MODE_WRITABLE;
335
hb_blob_try_writable (hb_blob_t *blob)
337
hb_memory_mode_t mode;
339
if (HB_OBJECT_IS_INERT (blob))
342
hb_mutex_lock (blob->lock);
344
if (blob->mode == HB_MEMORY_MODE_READONLY)
349
fprintf (stderr, "%p %s (%d) -> %p\n", blob, __FUNCTION__,
350
blob->lock_count, blob->data);
353
if (blob->lock_count)
356
new_data = malloc (blob->length);
359
fprintf (stderr, "%p %s: dupped successfully -> %p\n", blob, __FUNCTION__, blob->data);
361
memcpy (new_data, blob->data, blob->length);
362
_hb_blob_destroy_user_data (blob);
363
blob->mode = HB_MEMORY_MODE_WRITABLE;
364
blob->data = new_data;
365
blob->destroy = free;
366
blob->user_data = new_data;
369
else if (blob->mode == HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE)
370
_try_writable_inplace_locked (blob);
375
hb_mutex_unlock (blob->lock);
377
return mode == HB_MEMORY_MODE_WRITABLE;