2 * Copyright (C) 2009 Red Hat, Inc.
4 * This is part of HarfBuzz, a text shaping 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"
29 #include "hb-blob-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+0
45 hb_blob_t _hb_blob_nil = {
46 HB_REFERENCE_COUNT_INVALID, /* ref_count */
50 HB_MUTEX_INIT, /* lock */
53 HB_MEMORY_MODE_READONLY, /* mode */
62 _hb_blob_destroy_user_data (hb_blob_t *blob)
65 blob->destroy (blob->user_data);
67 blob->user_data = NULL;
72 _hb_blob_unlock_and_destroy (hb_blob_t *blob)
74 hb_blob_unlock (blob);
75 hb_blob_destroy (blob);
79 hb_blob_create (const char *data,
81 hb_memory_mode_t mode,
82 hb_destroy_func_t destroy,
87 if (!length || !HB_OBJECT_DO_CREATE (hb_blob_t, blob)) {
93 hb_mutex_init (blob->lock);
97 blob->length = length;
100 blob->destroy = destroy;
101 blob->user_data = user_data;
103 if (blob->mode == HB_MEMORY_MODE_DUPLICATE) {
104 blob->mode = HB_MEMORY_MODE_READONLY;
105 if (!hb_blob_try_writable (blob)) {
106 hb_blob_destroy (blob);
107 return &_hb_blob_nil;
115 hb_blob_create_sub_blob (hb_blob_t *parent,
122 if (!length || offset >= parent->length || !HB_OBJECT_DO_CREATE (hb_blob_t, blob))
123 return &_hb_blob_nil;
125 pdata = hb_blob_lock (parent);
127 blob->data = pdata + offset;
128 blob->length = MIN (length, parent->length - offset);
130 hb_mutex_lock (parent->lock);
131 blob->mode = parent->mode;
132 hb_mutex_unlock (parent->lock);
134 blob->destroy = (hb_destroy_func_t) _hb_blob_unlock_and_destroy;
135 blob->user_data = hb_blob_reference (parent);
141 hb_blob_create_empty (void)
143 return &_hb_blob_nil;
147 hb_blob_reference (hb_blob_t *blob)
149 HB_OBJECT_DO_REFERENCE (blob);
153 hb_blob_get_reference_count (hb_blob_t *blob)
155 HB_OBJECT_DO_GET_REFERENCE_COUNT (blob);
159 hb_blob_destroy (hb_blob_t *blob)
161 HB_OBJECT_DO_DESTROY (blob);
163 _hb_blob_destroy_user_data (blob);
169 hb_blob_get_length (hb_blob_t *blob)
175 hb_blob_lock (hb_blob_t *blob)
177 if (HB_OBJECT_IS_INERT (blob))
180 hb_mutex_lock (blob->lock);
183 fprintf (stderr, "%p %s (%d) -> %p\n", blob, __FUNCTION__,
184 blob->lock_count, blob->data);
188 hb_mutex_unlock (blob->lock);
194 hb_blob_unlock (hb_blob_t *blob)
196 if (HB_OBJECT_IS_INERT (blob))
199 hb_mutex_lock (blob->lock);
202 fprintf (stderr, "%p %s (%d) -> %p\n", blob, __FUNCTION__,
203 blob->lock_count, blob->data);
205 assert (blob->lock_count > 0);
208 hb_mutex_unlock (blob->lock);
212 hb_blob_is_writable (hb_blob_t *blob)
214 hb_memory_mode_t mode;
216 if (HB_OBJECT_IS_INERT (blob))
219 hb_mutex_lock (blob->lock);
223 hb_mutex_unlock (blob->lock);
225 return mode == HB_MEMORY_MODE_WRITABLE;
230 _try_make_writable_inplace_unix_locked (hb_blob_t *blob)
232 #if defined(HAVE_SYS_MMAN_H) && defined(HAVE_MPROTECT)
233 uintptr_t pagesize = -1, mask, length;
236 #if defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
237 pagesize = (uintptr_t) sysconf (_SC_PAGE_SIZE);
238 #elif defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
239 pagesize = (uintptr_t) sysconf (_SC_PAGESIZE);
240 #elif defined(HAVE_GETPAGESIZE)
241 pagesize = (uintptr_t) getpagesize ();
244 if ((uintptr_t) -1L == pagesize) {
246 fprintf (stderr, "%p %s: failed to get pagesize: %s\n", blob, __FUNCTION__, strerror (errno));
250 fprintf (stderr, "%p %s: pagesize is %u\n", blob, __FUNCTION__, pagesize);
252 mask = ~(pagesize-1);
253 addr = (const char *) (((uintptr_t) blob->data) & mask);
254 length = (const char *) (((uintptr_t) blob->data + blob->length + pagesize-1) & mask) - addr;
256 fprintf (stderr, "%p %s: calling mprotect on [%p..%p] (%d bytes)\n",
258 addr, addr+length, length);
259 if (-1 == mprotect ((void *) addr, length, PROT_READ | PROT_WRITE)) {
261 fprintf (stderr, "%p %s: %s\n", blob, __FUNCTION__, strerror (errno));
266 fprintf (stderr, "%p %s: successfully made [%p..%p] (%d bytes) writable\n",
268 addr, addr+length, length);
276 _try_writable_inplace_locked (hb_blob_t *blob)
279 fprintf (stderr, "%p %s: making writable\n", blob, __FUNCTION__);
281 if (_try_make_writable_inplace_unix_locked (blob)) {
283 fprintf (stderr, "%p %s: making writable -> succeeded\n", blob, __FUNCTION__);
284 blob->mode = HB_MEMORY_MODE_WRITABLE;
287 fprintf (stderr, "%p %s: making writable -> FAILED\n", blob, __FUNCTION__);
288 /* Failed to make writable inplace, mark that */
289 blob->mode = HB_MEMORY_MODE_READONLY;
294 hb_blob_try_writable_inplace (hb_blob_t *blob)
296 hb_memory_mode_t mode;
298 if (HB_OBJECT_IS_INERT (blob))
301 hb_mutex_lock (blob->lock);
303 if (blob->mode == HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE)
304 _try_writable_inplace_locked (blob);
308 hb_mutex_unlock (blob->lock);
310 return mode == HB_MEMORY_MODE_WRITABLE;
314 hb_blob_try_writable (hb_blob_t *blob)
316 hb_memory_mode_t mode;
318 if (HB_OBJECT_IS_INERT (blob))
321 hb_mutex_lock (blob->lock);
323 if (blob->mode == HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE)
324 _try_writable_inplace_locked (blob);
326 if (blob->mode == HB_MEMORY_MODE_READONLY)
331 fprintf (stderr, "%p %s (%d) -> %p\n", blob, __FUNCTION__,
332 blob->lock_count, blob->data);
334 if (blob->lock_count)
337 new_data = malloc (blob->length);
340 fprintf (stderr, "%p %s: dupped successfully -> %p\n", blob, __FUNCTION__, blob->data);
341 memcpy (new_data, blob->data, blob->length);
342 _hb_blob_destroy_user_data (blob);
343 blob->mode = HB_MEMORY_MODE_WRITABLE;
344 blob->data = new_data;
345 blob->destroy = free;
346 blob->user_data = new_data;
353 hb_mutex_unlock (blob->lock);
355 return mode == HB_MEMORY_MODE_WRITABLE;