2009-07-30 19:33:57 +00:00
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/*
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2011-04-21 21:14:28 +00:00
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* Copyright © 2009 Red Hat, Inc.
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2009-07-30 19:33:57 +00:00
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*
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2010-04-22 04:11:43 +00:00
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* This is part of HarfBuzz, a text shaping library.
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2009-07-30 19:33:57 +00:00
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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*/
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2011-04-20 22:50:27 +00:00
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#include "hb-private.hh"
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2009-07-30 19:33:57 +00:00
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2011-05-04 23:27:37 +00:00
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#include "hb-blob.h"
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#include "hb-object-private.hh"
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2009-07-30 19:33:57 +00:00
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2009-08-13 09:25:23 +00:00
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#ifdef HAVE_SYS_MMAN_H
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2009-08-12 23:36:29 +00:00
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#ifdef HAVE_UNISTD_H
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2009-08-03 21:53:29 +00:00
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#include <unistd.h>
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2009-08-12 23:36:29 +00:00
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#endif /* HAVE_UNISTD_H */
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2009-08-03 21:53:29 +00:00
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#include <sys/mman.h>
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2009-08-13 09:25:23 +00:00
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#endif /* HAVE_SYS_MMAN_H */
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2009-08-03 21:53:29 +00:00
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2010-07-23 19:11:18 +00:00
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#include <stdio.h>
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#include <errno.h>
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HB_BEGIN_DECLS
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2009-08-28 20:31:20 +00:00
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#ifndef HB_DEBUG_BLOB
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2010-11-03 19:11:04 +00:00
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#define HB_DEBUG_BLOB (HB_DEBUG+0)
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2009-08-28 20:31:20 +00:00
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#endif
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2011-05-04 23:27:37 +00:00
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struct _hb_blob_t {
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hb_object_header_t header;
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2011-05-07 02:28:26 +00:00
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bool immutable;
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2011-05-04 23:27:37 +00:00
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const char *data;
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2011-05-07 02:28:26 +00:00
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unsigned int length;
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hb_memory_mode_t mode;
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2011-05-04 23:27:37 +00:00
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void *user_data;
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hb_destroy_func_t destroy;
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};
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static hb_blob_t _hb_blob_nil = {
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2011-04-21 22:24:02 +00:00
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HB_OBJECT_HEADER_STATIC,
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2009-08-01 23:05:44 +00:00
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2011-05-07 02:28:26 +00:00
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TRUE, /* immutable */
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2009-07-30 19:33:57 +00:00
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2011-05-07 02:28:26 +00:00
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0, /* length */
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2009-08-06 17:33:51 +00:00
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NULL, /* data */
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2011-05-07 02:28:26 +00:00
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HB_MEMORY_MODE_READONLY, /* mode */
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2009-08-06 17:33:51 +00:00
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2011-04-20 06:59:28 +00:00
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NULL, /* user_data */
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NULL /* destroy */
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2009-07-30 19:33:57 +00:00
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};
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2011-05-07 02:28:26 +00:00
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static bool _try_writable (hb_blob_t *blob);
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2009-07-30 19:33:57 +00:00
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static void
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_hb_blob_destroy_user_data (hb_blob_t *blob)
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{
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if (blob->destroy) {
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blob->destroy (blob->user_data);
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blob->user_data = NULL;
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2011-04-20 06:59:28 +00:00
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blob->destroy = NULL;
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2009-07-30 19:33:57 +00:00
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}
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}
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hb_blob_t *
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hb_blob_create (const char *data,
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2009-08-03 21:53:29 +00:00
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unsigned int length,
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2009-07-30 19:33:57 +00:00
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hb_memory_mode_t mode,
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2011-04-20 06:59:28 +00:00
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void *user_data,
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hb_destroy_func_t destroy)
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2009-07-30 19:33:57 +00:00
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{
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hb_blob_t *blob;
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2011-04-27 20:38:03 +00:00
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if (!length || !(blob = hb_object_create<hb_blob_t> ())) {
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2009-07-30 19:33:57 +00:00
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if (destroy)
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destroy (user_data);
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return &_hb_blob_nil;
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}
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blob->data = data;
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2009-08-03 21:53:29 +00:00
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blob->length = length;
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2009-07-30 19:33:57 +00:00
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blob->mode = mode;
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blob->user_data = user_data;
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2011-04-20 06:59:28 +00:00
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blob->destroy = destroy;
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2009-07-30 19:33:57 +00:00
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if (blob->mode == HB_MEMORY_MODE_DUPLICATE) {
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blob->mode = HB_MEMORY_MODE_READONLY;
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2011-05-07 02:28:26 +00:00
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if (!_try_writable (blob)) {
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2009-08-04 01:27:08 +00:00
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hb_blob_destroy (blob);
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return &_hb_blob_nil;
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}
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2009-07-30 19:33:57 +00:00
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}
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return blob;
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}
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2009-08-03 21:53:29 +00:00
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hb_blob_t *
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hb_blob_create_sub_blob (hb_blob_t *parent,
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unsigned int offset,
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unsigned int length)
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{
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hb_blob_t *blob;
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2011-04-27 20:38:03 +00:00
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if (!length || offset >= parent->length || !(blob = hb_object_create<hb_blob_t> ()))
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2009-08-03 21:53:29 +00:00
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return &_hb_blob_nil;
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2011-05-07 02:28:26 +00:00
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hb_blob_make_immutable (parent);
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2009-08-03 21:53:29 +00:00
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2011-05-07 02:28:26 +00:00
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blob = hb_blob_create (parent->data + offset,
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2011-05-03 04:19:18 +00:00
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MIN (length, parent->length - offset),
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parent->mode,
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hb_blob_reference (parent),
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2011-05-07 02:28:26 +00:00
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(hb_destroy_func_t) hb_blob_destroy);
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2009-08-03 21:53:29 +00:00
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return blob;
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}
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hb_blob_t *
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2011-05-02 23:36:39 +00:00
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hb_blob_get_empty (void)
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2009-08-03 21:53:29 +00:00
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{
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return &_hb_blob_nil;
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}
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2009-07-30 19:33:57 +00:00
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hb_blob_t *
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hb_blob_reference (hb_blob_t *blob)
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{
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2011-04-27 20:38:03 +00:00
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return hb_object_reference (blob);
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2009-07-30 19:33:57 +00:00
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}
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void
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hb_blob_destroy (hb_blob_t *blob)
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{
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2011-04-27 20:38:03 +00:00
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if (!hb_object_destroy (blob)) return;
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2009-07-30 19:33:57 +00:00
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_hb_blob_destroy_user_data (blob);
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free (blob);
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}
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2011-04-28 01:46:01 +00:00
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hb_bool_t
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hb_blob_set_user_data (hb_blob_t *blob,
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hb_user_data_key_t *key,
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void * data,
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hb_destroy_func_t destroy)
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{
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return hb_object_set_user_data (blob, key, data, destroy);
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}
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void *
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hb_blob_get_user_data (hb_blob_t *blob,
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hb_user_data_key_t *key)
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{
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return hb_object_get_user_data (blob, key);
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}
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2009-08-04 01:27:08 +00:00
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void
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2011-05-07 02:28:26 +00:00
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hb_blob_make_immutable (hb_blob_t *blob)
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2009-08-04 01:27:08 +00:00
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{
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2011-04-27 20:38:03 +00:00
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if (hb_object_is_inert (blob))
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2009-08-06 17:33:51 +00:00
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return;
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2011-05-07 02:28:26 +00:00
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blob->immutable = TRUE;
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}
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2009-08-05 19:20:34 +00:00
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2011-05-07 02:28:26 +00:00
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hb_bool_t
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hb_blob_is_immutable (hb_blob_t *blob)
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{
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return blob->immutable;
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}
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2009-08-06 17:33:51 +00:00
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2009-11-06 01:08:17 +00:00
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2011-05-07 02:28:26 +00:00
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unsigned int
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hb_blob_get_length (hb_blob_t *blob)
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{
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return blob->length;
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2009-07-30 19:33:57 +00:00
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}
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2011-05-07 02:28:26 +00:00
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const char *
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hb_blob_get_data (hb_blob_t *blob, unsigned int *length)
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2009-07-30 19:33:57 +00:00
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{
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2011-05-07 02:28:26 +00:00
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if (length)
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*length = blob->length;
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2009-08-06 17:33:51 +00:00
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2011-05-07 02:28:26 +00:00
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return blob->data;
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}
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2009-08-06 17:33:51 +00:00
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2011-05-07 02:28:26 +00:00
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char *
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hb_blob_get_data_writable (hb_blob_t *blob, unsigned int *length)
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{
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if (!_try_writable (blob)) {
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if (length)
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*length = 0;
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2009-08-06 17:33:51 +00:00
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2011-05-07 02:28:26 +00:00
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return NULL;
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}
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2009-08-06 17:33:51 +00:00
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2011-05-07 02:28:26 +00:00
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if (length)
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*length = blob->length;
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2009-08-06 17:33:51 +00:00
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2011-05-07 02:28:26 +00:00
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return const_cast<char *> (blob->data);
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2009-07-30 19:33:57 +00:00
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}
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2009-08-18 19:49:23 +00:00
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static hb_bool_t
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2011-05-07 02:28:26 +00:00
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_try_make_writable_inplace_unix (hb_blob_t *blob)
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2009-08-18 19:49:23 +00:00
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{
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#if defined(HAVE_SYS_MMAN_H) && defined(HAVE_MPROTECT)
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2010-02-23 21:47:51 +00:00
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uintptr_t pagesize = -1, mask, length;
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2009-08-18 19:49:23 +00:00
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const char *addr;
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#if defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
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2010-02-23 21:47:51 +00:00
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pagesize = (uintptr_t) sysconf (_SC_PAGE_SIZE);
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2009-08-18 19:49:23 +00:00
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#elif defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
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2010-02-23 21:47:51 +00:00
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pagesize = (uintptr_t) sysconf (_SC_PAGESIZE);
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2009-08-18 19:49:23 +00:00
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#elif defined(HAVE_GETPAGESIZE)
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2010-02-23 21:47:51 +00:00
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pagesize = (uintptr_t) getpagesize ();
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2009-08-18 19:49:23 +00:00
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#endif
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2010-02-23 21:47:51 +00:00
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if ((uintptr_t) -1L == pagesize) {
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2010-11-03 19:50:36 +00:00
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(void) (HB_DEBUG_BLOB &&
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2011-04-27 20:14:04 +00:00
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fprintf (stderr, "%p %s: failed to get pagesize: %s\n", blob, HB_FUNC, strerror (errno)));
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2009-08-18 19:49:23 +00:00
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return FALSE;
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}
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2010-11-03 19:50:36 +00:00
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(void) (HB_DEBUG_BLOB &&
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2011-04-27 20:14:04 +00:00
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fprintf (stderr, "%p %s: pagesize is %lu\n", blob, HB_FUNC, (unsigned long) pagesize));
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2009-08-18 19:49:23 +00:00
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mask = ~(pagesize-1);
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2010-02-23 21:47:51 +00:00
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addr = (const char *) (((uintptr_t) blob->data) & mask);
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length = (const char *) (((uintptr_t) blob->data + blob->length + pagesize-1) & mask) - addr;
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2010-11-03 19:50:36 +00:00
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(void) (HB_DEBUG_BLOB &&
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2010-07-15 18:21:34 +00:00
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fprintf (stderr, "%p %s: calling mprotect on [%p..%p] (%lu bytes)\n",
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2011-04-27 20:14:04 +00:00
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blob, HB_FUNC,
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2010-11-03 19:50:36 +00:00
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addr, addr+length, (unsigned long) length));
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2009-08-18 19:49:23 +00:00
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if (-1 == mprotect ((void *) addr, length, PROT_READ | PROT_WRITE)) {
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2010-11-03 19:50:36 +00:00
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(void) (HB_DEBUG_BLOB &&
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2011-04-27 20:14:04 +00:00
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fprintf (stderr, "%p %s: %s\n", blob, HB_FUNC, strerror (errno)));
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2009-08-18 19:49:23 +00:00
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return FALSE;
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}
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2011-05-07 02:28:26 +00:00
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blob->mode = HB_MEMORY_MODE_WRITABLE;
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2010-11-03 19:50:36 +00:00
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(void) (HB_DEBUG_BLOB &&
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2010-07-15 18:21:34 +00:00
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fprintf (stderr, "%p %s: successfully made [%p..%p] (%lu bytes) writable\n",
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2011-04-27 20:14:04 +00:00
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blob, HB_FUNC,
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2010-11-03 19:50:36 +00:00
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addr, addr+length, (unsigned long) length));
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2009-08-18 19:49:23 +00:00
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return TRUE;
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#else
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return FALSE;
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#endif
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}
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2011-05-07 02:28:26 +00:00
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static bool
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_try_writable_inplace (hb_blob_t *blob)
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2009-08-19 20:45:41 +00:00
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{
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2010-11-03 19:50:36 +00:00
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(void) (HB_DEBUG_BLOB &&
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2011-05-07 02:28:26 +00:00
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fprintf (stderr, "%p %s: making writable inplace\n", blob, HB_FUNC));
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2009-08-19 20:45:41 +00:00
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2011-05-07 02:28:26 +00:00
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if (_try_make_writable_inplace_unix (blob))
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return TRUE;
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(void) (HB_DEBUG_BLOB &&
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fprintf (stderr, "%p %s: making writable -> FAILED\n", blob, HB_FUNC));
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/* Failed to make writable inplace, mark that */
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blob->mode = HB_MEMORY_MODE_READONLY;
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return FALSE;
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2009-08-19 20:45:41 +00:00
|
|
|
}
|
2009-08-18 19:49:23 +00:00
|
|
|
|
2011-05-07 02:28:26 +00:00
|
|
|
static bool
|
|
|
|
_try_writable (hb_blob_t *blob)
|
2009-07-30 19:33:57 +00:00
|
|
|
{
|
2011-05-07 02:28:26 +00:00
|
|
|
if (blob->immutable)
|
2009-08-04 01:27:08 +00:00
|
|
|
return FALSE;
|
|
|
|
|
2011-05-07 02:28:26 +00:00
|
|
|
if (blob->mode == HB_MEMORY_MODE_WRITABLE)
|
|
|
|
return TRUE;
|
2009-08-06 17:33:51 +00:00
|
|
|
|
2011-05-07 02:28:26 +00:00
|
|
|
if (blob->mode == HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE && _try_writable_inplace (blob))
|
|
|
|
return TRUE;
|
2010-04-23 17:48:06 +00:00
|
|
|
|
2011-05-07 02:28:26 +00:00
|
|
|
if (blob->mode == HB_MEMORY_MODE_WRITABLE)
|
|
|
|
return TRUE;
|
2009-07-30 19:33:57 +00:00
|
|
|
|
2009-08-04 01:27:08 +00:00
|
|
|
|
2011-05-07 02:28:26 +00:00
|
|
|
(void) (HB_DEBUG_BLOB &&
|
|
|
|
fprintf (stderr, "%p %s -> %p\n", blob, HB_FUNC, blob->data));
|
|
|
|
|
|
|
|
char *new_data;
|
|
|
|
|
|
|
|
new_data = (char *) malloc (blob->length);
|
|
|
|
if (unlikely (!new_data))
|
|
|
|
return FALSE;
|
2009-08-06 17:33:51 +00:00
|
|
|
|
2011-05-07 02:28:26 +00:00
|
|
|
(void) (HB_DEBUG_BLOB &&
|
|
|
|
fprintf (stderr, "%p %s: dupped successfully -> %p\n", blob, HB_FUNC, blob->data));
|
2009-08-06 17:33:51 +00:00
|
|
|
|
2011-05-07 02:28:26 +00:00
|
|
|
memcpy (new_data, blob->data, blob->length);
|
|
|
|
_hb_blob_destroy_user_data (blob);
|
|
|
|
blob->mode = HB_MEMORY_MODE_WRITABLE;
|
|
|
|
blob->data = new_data;
|
|
|
|
blob->user_data = new_data;
|
|
|
|
blob->destroy = free;
|
|
|
|
|
|
|
|
return TRUE;
|
2009-07-30 19:33:57 +00:00
|
|
|
}
|
2010-07-23 19:11:18 +00:00
|
|
|
|
|
|
|
|
|
|
|
HB_END_DECLS
|