/* This is an internal routine to free any memory that the info struct is
* pointing to before re-using it or freeing the struct itself. Recall
* that png_free() checks for NULL pointers for us.
*/
void
png_info_destroy(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
png_debug(1, "in png_info_destroy\n");
if (info_ptr->text != NULL)
{
int i;
for (i = 0; i < info_ptr->num_text; i++)
{
png_free(png_ptr, info_ptr->text[i].key);
}
png_free(png_ptr, info_ptr->text);
}
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
png_free(png_ptr, info_ptr->pcal_purpose);
png_free(png_ptr, info_ptr->pcal_units);
if (info_ptr->pcal_params != NULL)
{
int i;
for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
{
png_free(png_ptr, info_ptr->pcal_params[i]);
}
png_free(png_ptr, info_ptr->pcal_params);
}
#endif
png_info_init(info_ptr);
}
/* This is an internal routine to free any memory that the info struct is
* pointing to before re-using it or freeing the struct itself. Recall
* that png_free() checks for NULL pointers for us.
*/
void
png_info_destroy(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_info_destroy\n");
png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
if (png_ptr->num_chunk_list)
{
png_free(png_ptr, png_ptr->chunk_list);
png_ptr->num_chunk_list=0;
}
#endif
png_info_init(info_ptr);
}
/* Allocate the memory for an info_struct for the application. We don't
* really need the png_ptr, but it could potentially be useful in the
* future. This should be used in favour of malloc(sizeof(png_info))
* and png_info_init() so that applications that want to use a shared
* libpng don't have to be recompiled if png_info changes size.
*/
png_infop
png_create_info_struct(png_structp png_ptr)
{
png_infop info_ptr;
png_debug(1, "in png_create_info_struct\n");
if(png_ptr == NULL) return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
if ((info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
png_ptr->malloc_fn)) != NULL)
#else
if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL)
#endif
{
png_info_init(info_ptr);
}
return (info_ptr);
}
