LCOV - app.info - gfx/harfbuzz/src/hb-blob.cc

LCOV - code coverage report
| Current view: | directory - gfx/harfbuzz/src - hb-blob.cc (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 93 | 2 | 2.2 %
| Date: | 2012-06-02 | Functions: | 19 | 2 | 10.5 %

           1                 : /*
           2                 :  * Copyright © 2009  Red Hat, Inc.
           3                 :  *
           4                 :  *  This is part of HarfBuzz, a text shaping library.
           5                 :  *
           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.
          11                 :  *
          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
          16                 :  * DAMAGE.
          17                 :  *
          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.
          23                 :  *
          24                 :  * Red Hat Author(s): Behdad Esfahbod
          25                 :  */
          26                 :
          27                 : #include "hb-private.hh"
          28                 :
          29                 : #include "hb-blob.h"
          30                 : #include "hb-object-private.hh"
          31                 :
          32                 : #ifdef HAVE_SYS_MMAN_H
          33                 : #ifdef HAVE_UNISTD_H
          34                 : #include <unistd.h>
          35                 : #endif /* HAVE_UNISTD_H */
          36                 : #include <sys/mman.h>
          37                 : #endif /* HAVE_SYS_MMAN_H */
          38                 :
          39                 : #include <stdio.h>
          40                 : #include <errno.h>
          41                 :
          42                 :
          43                 :
          44                 : #ifndef HB_DEBUG_BLOB
          45                 : #define HB_DEBUG_BLOB (HB_DEBUG+0)
          46                 : #endif
          47                 :
          48                 :
          49                 : struct _hb_blob_t {
          50                 :   hb_object_header_t header;
          51                 :
          52                 :   bool immutable;
          53                 :
          54                 :   const char *data;
          55                 :   unsigned int length;
          56                 :   hb_memory_mode_t mode;
          57                 :
          58                 :   void *user_data;
          59                 :   hb_destroy_func_t destroy;
          60                 : };
          61                 :
          62                 : static hb_blob_t _hb_blob_nil = {
          63                 :   HB_OBJECT_HEADER_STATIC,
          64                 :
          65                 :   TRUE, /* immutable */
          66                 :
          67                 :   NULL, /* data */
          68                 :   0, /* length */
          69                 :   HB_MEMORY_MODE_READONLY, /* mode */
          70                 :
          71                 :   NULL, /* user_data */
          72                 :   NULL  /* destroy */
          73            1464 : };
          74                 :
          75                 :
          76                 : static bool _try_writable (hb_blob_t *blob);
          77                 :
          78                 : static void
          79               0 : _hb_blob_destroy_user_data (hb_blob_t *blob)
          80                 : {
          81               0 :   if (blob->destroy) {
          82               0 :     blob->destroy (blob->user_data);
          83               0 :     blob->user_data = NULL;
          84               0 :     blob->destroy = NULL;
          85                 :   }
          86               0 : }
          87                 :
          88                 : hb_blob_t *
          89               0 : hb_blob_create (const char        *data,
          90                 :                 unsigned int       length,
          91                 :                 hb_memory_mode_t   mode,
          92                 :                 void              *user_data,
          93                 :                 hb_destroy_func_t  destroy)
          94                 : {
          95                 :   hb_blob_t *blob;
          96                 :
          97               0 :   if (!length || !(blob = hb_object_create<hb_blob_t> ())) {
          98               0 :     if (destroy)
          99               0 :       destroy (user_data);
         100               0 :     return &_hb_blob_nil;
         101                 :   }
         102                 :
         103               0 :   blob->data = data;
         104               0 :   blob->length = length;
         105               0 :   blob->mode = mode;
         106                 :
         107               0 :   blob->user_data = user_data;
         108               0 :   blob->destroy = destroy;
         109                 :
         110               0 :   if (blob->mode == HB_MEMORY_MODE_DUPLICATE) {
         111               0 :     blob->mode = HB_MEMORY_MODE_READONLY;
         112               0 :     if (!_try_writable (blob)) {
         113               0 :       hb_blob_destroy (blob);
         114               0 :       return &_hb_blob_nil;
         115                 :     }
         116                 :   }
         117                 :
         118               0 :   return blob;
         119                 : }
         120                 :
         121                 : hb_blob_t *
         122               0 : hb_blob_create_sub_blob (hb_blob_t    *parent,
         123                 :                          unsigned int  offset,
         124                 :                          unsigned int  length)
         125                 : {
         126                 :   hb_blob_t *blob;
         127                 :
         128               0 :   if (!length || offset >= parent->length)
         129               0 :     return &_hb_blob_nil;
         130                 :
         131               0 :   hb_blob_make_immutable (parent);
         132                 :
         133                 :   blob = hb_blob_create (parent->data + offset,
         134                 :                          MIN (length, parent->length - offset),
         135                 :                          parent->mode,
         136               0 :                          hb_blob_reference (parent),
         137               0 :                          (hb_destroy_func_t) hb_blob_destroy);
         138                 :
         139               0 :   return blob;
         140                 : }
         141                 :
         142                 : hb_blob_t *
         143               0 : hb_blob_get_empty (void)
         144                 : {
         145               0 :   return &_hb_blob_nil;
         146                 : }
         147                 :
         148                 : hb_blob_t *
         149               0 : hb_blob_reference (hb_blob_t *blob)
         150                 : {
         151               0 :   return hb_object_reference (blob);
         152                 : }
         153                 :
         154                 : void
         155               0 : hb_blob_destroy (hb_blob_t *blob)
         156                 : {
         157               0 :   if (!hb_object_destroy (blob)) return;
         158                 :
         159               0 :   _hb_blob_destroy_user_data (blob);
         160                 :
         161               0 :   free (blob);
         162                 : }
         163                 :
         164                 : hb_bool_t
         165               0 : hb_blob_set_user_data (hb_blob_t          *blob,
         166                 :                        hb_user_data_key_t *key,
         167                 :                        void *              data,
         168                 :                        hb_destroy_func_t   destroy,
         169                 :                        hb_bool_t           replace)
         170                 : {
         171               0 :   return hb_object_set_user_data (blob, key, data, destroy, replace);
         172                 : }
         173                 :
         174                 : void *
         175               0 : hb_blob_get_user_data (hb_blob_t          *blob,
         176                 :                        hb_user_data_key_t *key)
         177                 : {
         178               0 :   return hb_object_get_user_data (blob, key);
         179                 : }
         180                 :
         181                 :
         182                 : void
         183               0 : hb_blob_make_immutable (hb_blob_t *blob)
         184                 : {
         185               0 :   if (hb_object_is_inert (blob))
         186               0 :     return;
         187                 :
         188               0 :   blob->immutable = TRUE;
         189                 : }
         190                 :
         191                 : hb_bool_t
         192               0 : hb_blob_is_immutable (hb_blob_t *blob)
         193                 : {
         194               0 :   return blob->immutable;
         195                 : }
         196                 :
         197                 :
         198                 : unsigned int
         199               0 : hb_blob_get_length (hb_blob_t *blob)
         200                 : {
         201               0 :   return blob->length;
         202                 : }
         203                 :
         204                 : const char *
         205               0 : hb_blob_get_data (hb_blob_t *blob, unsigned int *length)
         206                 : {
         207               0 :   if (length)
         208               0 :     *length = blob->length;
         209                 :
         210               0 :   return blob->data;
         211                 : }
         212                 :
         213                 : char *
         214               0 : hb_blob_get_data_writable (hb_blob_t *blob, unsigned int *length)
         215                 : {
         216               0 :   if (!_try_writable (blob)) {
         217               0 :     if (length)
         218               0 :       *length = 0;
         219                 :
         220               0 :     return NULL;
         221                 :   }
         222                 :
         223               0 :   if (length)
         224               0 :     *length = blob->length;
         225                 :
         226               0 :   return const_cast<char *> (blob->data);
         227                 : }
         228                 :
         229                 :
         230                 : static hb_bool_t
         231               0 : _try_make_writable_inplace_unix (hb_blob_t *blob)
         232                 : {
         233                 : #if defined(HAVE_SYS_MMAN_H) && defined(HAVE_MPROTECT)
         234                 :   uintptr_t pagesize = -1, mask, length;
         235                 :   const char *addr;
         236                 :
         237                 : #if defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
         238                 :   pagesize = (uintptr_t) sysconf (_SC_PAGE_SIZE);
         239                 : #elif defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
         240                 :   pagesize = (uintptr_t) sysconf (_SC_PAGESIZE);
         241                 : #elif defined(HAVE_GETPAGESIZE)
         242                 :   pagesize = (uintptr_t) getpagesize ();
         243                 : #endif
         244                 :
         245                 :   if ((uintptr_t) -1L == pagesize) {
         246                 :     DEBUG_MSG_FUNC (BLOB, blob, "failed to get pagesize: %s", strerror (errno));
         247                 :     return FALSE;
         248                 :   }
         249                 :   DEBUG_MSG_FUNC (BLOB, blob, "pagesize is %lu", (unsigned long) pagesize);
         250                 :
         251                 :   mask = ~(pagesize-1);
         252                 :   addr = (const char *) (((uintptr_t) blob->data) & mask);
         253                 :   length = (const char *) (((uintptr_t) blob->data + blob->length + pagesize-1) & mask)  - addr;
         254                 :   DEBUG_MSG_FUNC (BLOB, blob,
         255                 :                   "calling mprotect on [%p..%p] (%lu bytes)",
         256                 :                   addr, addr+length, (unsigned long) length);
         257                 :   if (-1 == mprotect ((void *) addr, length, PROT_READ | PROT_WRITE)) {
         258                 :     DEBUG_MSG_FUNC (BLOB, blob, "mprotect failed: %s", strerror (errno));
         259                 :     return FALSE;
         260                 :   }
         261                 :
         262                 :   blob->mode = HB_MEMORY_MODE_WRITABLE;
         263                 :
         264                 :   DEBUG_MSG_FUNC (BLOB, blob,
         265                 :                   "successfully made [%p..%p] (%lu bytes) writable\n",
         266                 :                   addr, addr+length, (unsigned long) length);
         267                 :   return TRUE;
         268                 : #else
         269               0 :   return FALSE;
         270                 : #endif
         271                 : }
         272                 :
         273                 : static bool
         274               0 : _try_writable_inplace (hb_blob_t *blob)
         275                 : {
         276               0 :   DEBUG_MSG_FUNC (BLOB, blob, "making writable inplace\n");
         277                 :
         278               0 :   if (_try_make_writable_inplace_unix (blob))
         279               0 :     return TRUE;
         280                 :
         281               0 :   DEBUG_MSG_FUNC (BLOB, blob, "making writable -> FAILED\n");
         282                 :
         283                 :   /* Failed to make writable inplace, mark that */
         284               0 :   blob->mode = HB_MEMORY_MODE_READONLY;
         285               0 :   return FALSE;
         286                 : }
         287                 :
         288                 : static bool
         289               0 : _try_writable (hb_blob_t *blob)
         290                 : {
         291               0 :   if (blob->immutable)
         292               0 :     return FALSE;
         293                 :
         294               0 :   if (blob->mode == HB_MEMORY_MODE_WRITABLE)
         295               0 :     return TRUE;
         296                 :
         297               0 :   if (blob->mode == HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE && _try_writable_inplace (blob))
         298               0 :     return TRUE;
         299                 :
         300               0 :   if (blob->mode == HB_MEMORY_MODE_WRITABLE)
         301               0 :     return TRUE;
         302                 :
         303                 :
         304               0 :   DEBUG_MSG_FUNC (BLOB, blob, "currect data is -> %p\n", blob->data);
         305                 :
         306                 :   char *new_data;
         307                 :
         308               0 :   new_data = (char *) malloc (blob->length);
         309               0 :   if (unlikely (!new_data))
         310               0 :     return FALSE;
         311                 :
         312               0 :   DEBUG_MSG_FUNC (BLOB, blob, "dupped successfully -> %p\n", blob->data);
         313                 :
         314               0 :   memcpy (new_data, blob->data, blob->length);
         315               0 :   _hb_blob_destroy_user_data (blob);
         316               0 :   blob->mode = HB_MEMORY_MODE_WRITABLE;
         317               0 :   blob->data = new_data;
         318               0 :   blob->user_data = new_data;
         319               0 :   blob->destroy = free;
         320                 :
         321               0 :   return TRUE;
         322            4392 : }
         323                 :
         324                 :

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