/* Free a pointer. It is removed from the list at the same time. */
void
png_debug_free(png_structp png_ptr, png_voidp ptr)
{
if (png_ptr == NULL)
fprintf(STDERR, "NULL pointer to png_debug_free.\n");
if (ptr == 0)
{
#if 0 /* This happens all the time. */
fprintf(STDERR, "WARNING: freeing NULL pointer\n");
#endif
return;
}
/* Unlink the element from the list. */
{
memory_infop FAR *ppinfo = &pinformation;
for (;;)
{
memory_infop pinfo = *ppinfo;
if (pinfo->pointer == ptr)
{
*ppinfo = pinfo->next;
current_allocation -= pinfo->size;
if (current_allocation < 0)
fprintf(STDERR, "Duplicate free of memory\n");
/* We must free the list element too, but first kill
the memory that is to be freed. */
png_memset(ptr, 0x55, pinfo->size);
png_free_default(png_ptr, pinfo);
pinfo=NULL;
break;
}
if (pinfo->next == NULL)
{
fprintf(STDERR, "Pointer %x not found\n", (unsigned int)ptr);
break;
}
ppinfo = &pinfo->next;
}
}
/* Finally free the data. */
#if PNG_DEBUG
if(verbose)
printf("Freeing %x\n",ptr);
#endif
png_free_default(png_ptr, ptr);
ptr=NULL;
}
/* Free a pointer allocated by png_malloc(). If ptr is NULL, return
without taking any action. */
void PNGAPI
png_free(png_structp png_ptr, png_voidp ptr) {
if (png_ptr == NULL || ptr == NULL) {
return;
}
#ifdef PNG_USER_MEM_SUPPORTED
if (png_ptr->free_fn != NULL) {
(*(png_ptr->free_fn))(png_ptr, ptr);
return;
} else { png_free_default(png_ptr, ptr); }
}
