int
pdf_is_stream(fz_context *ctx, pdf_obj *obj)
{
pdf_document *doc = pdf_get_bound_document(ctx, obj);
int num = pdf_obj_parent_num(ctx, obj);
return pdf_obj_num_is_stream(ctx, doc, num);
}
static void prepare_object_for_alteration(fz_context *ctx, pdf_obj *obj, pdf_obj *val)
{
pdf_document *doc, *val_doc;
int parent;
/*
obj should be a dict or an array. We don't care about
any other types, as they aren't 'containers'.
*/
if (obj < PDF_OBJ__LIMIT)
return;
switch (obj->kind)
{
case PDF_DICT:
doc = DICT(obj)->doc;
parent = DICT(obj)->parent_num;
break;
case PDF_ARRAY:
doc = ARRAY(obj)->doc;
parent = ARRAY(obj)->parent_num;
break;
default:
return;
}
if (val)
{
val_doc = pdf_get_bound_document(ctx, val);
if (doc && val_doc && val_doc != doc)
fz_throw(ctx, FZ_ERROR_GENERIC, "container and item belong to different documents");
}
/*
parent_num = 0 while an object is being parsed from the file.
No further action is necessary.
*/
if (parent == 0 || doc->freeze_updates)
return;
/*
Otherwise we need to ensure that the containing hierarchy of objects
has been moved to the incremental xref section and the newly linked
object needs to record the parent_num
*/
pdf_xref_ensure_incremental_object(ctx, doc, parent);
pdf_set_obj_parent(ctx, val, parent);
}
