/*
* Copyright (C) 2009 Red Hat, Inc.
*
* This is part of HarfBuzz, an OpenType Layout engine library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
*/
#include "hb-private.h"
#include "hb-blob.h"
struct _hb_blob_t {
hb_reference_count_t ref_count;
const char *data;
unsigned int len;
hb_memory_mode_t mode;
hb_destroy_func_t destroy;
void *user_data;
};
static hb_blob_t _hb_blob_nil = {
HB_REFERENCE_COUNT_INVALID, /* ref_count */
NULL, /* data */
0, /* len */
HB_MEMORY_MODE_READONLY, /* mode */
NULL, /* destroy */
NULL /* user_data */
};
static void
_hb_blob_destroy_user_data (hb_blob_t *blob)
{
if (blob->destroy) {
blob->destroy (blob->user_data);
blob->destroy = NULL;
blob->user_data = NULL;
}
}
hb_blob_t *
hb_blob_create (const char *data,
unsigned int len,
hb_memory_mode_t mode,
hb_destroy_func_t destroy,
void *user_data)
{
hb_blob_t *blob;
if (!HB_OBJECT_DO_CREATE (blob)) {
if (destroy)
destroy (user_data);
return &_hb_blob_nil;
}
blob->data = data;
blob->len = len;
blob->mode = mode;
blob->destroy = destroy;
blob->user_data = user_data;
if (blob->mode == HB_MEMORY_MODE_DUPLICATE) {
blob->mode = HB_MEMORY_MODE_READONLY;
hb_blob_make_writeable (blob);
}
return blob;
}
hb_blob_t *
hb_blob_reference (hb_blob_t *blob)
{
HB_OBJECT_DO_REFERENCE (blob);
}
unsigned int
hb_blob_get_reference_count (hb_blob_t *blob)
{
HB_OBJECT_DO_GET_REFERENCE_COUNT (blob);
}
void
hb_blob_destroy (hb_blob_t *blob)
{
HB_OBJECT_DO_DESTROY (blob);
_hb_blob_destroy_user_data (blob);
free (blob);
}
const char *
hb_blob_get_data (hb_blob_t *blob,
unsigned int *len)
{
if (len)
*len = blob->len;
return blob->data;
}
hb_bool_t
hb_blob_is_writeable (hb_blob_t *blob)
{
return blob->mode == HB_MEMORY_MODE_WRITEABLE;
}
hb_bool_t
hb_blob_try_writeable_inplace (hb_blob_t *blob)
{
if (blob->mode == HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITEABLE) {
/* XXX
* mprotect
blob->mode == HB_MEMORY_MODE_WRITEABLE;
*/
}
return blob->mode == HB_MEMORY_MODE_WRITEABLE;
}
/* DANGER: May rebase or nullify */
void
hb_blob_make_writeable (hb_blob_t *blob)
{
if (blob->mode == HB_MEMORY_MODE_READONLY_NEVER_DUPLICATE)
{
_hb_blob_destroy_user_data (blob);
blob->data = NULL;
blob->len = 0;
}
else if (blob->mode == HB_MEMORY_MODE_READONLY)
{
char *new_data;
new_data = malloc (blob->len);
if (new_data)
memcpy (new_data, blob->data, blob->len);
_hb_blob_destroy_user_data (blob);
if (!new_data) {
blob->data = NULL;
blob->len = 0;
} else
blob->data = new_data;
blob->mode = HB_MEMORY_MODE_WRITEABLE;
}
else
hb_blob_try_writeable_inplace (blob);
}
