fz_outline *
pdf_load_outline(pdf_document *xref)
{
pdf_obj *root, *obj, *first;
root = pdf_dict_gets(xref->trailer, "Root");
obj = pdf_dict_gets(root, "Outlines");
first = pdf_dict_gets(obj, "First");
if (first)
return pdf_load_outline_imp(xref, first);
return NULL;
}
fz_outline *
pdf_load_outline(fz_context *ctx, pdf_document *doc)
{
pdf_obj *root, *obj, *first;
root = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root);
obj = pdf_dict_get(ctx, root, PDF_NAME_Outlines);
first = pdf_dict_get(ctx, obj, PDF_NAME_First);
if (first)
return pdf_load_outline_imp(ctx, doc, first);
return NULL;
}
fz_outline *
pdf_load_outline(pdf_xref *xref)
{
fz_obj *root, *obj, *first;
fz_context *ctx = xref->ctx;
root = fz_dict_gets(ctx, xref->trailer, "Root");
obj = fz_dict_gets(ctx, root, "Outlines");
first = fz_dict_gets(ctx, obj, "First");
if (first)
return pdf_load_outline_imp(xref, first);
return NULL;
}
fz_outline *
pdf_load_outline(fz_context *ctx, pdf_document *doc)
{
pdf_obj *root, *obj, *first;
fz_outline *outline = NULL;
pdf_load_page_tree(ctx, doc); /* cache page tree for fast link destination lookups */
fz_try(ctx)
{
root = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root);
obj = pdf_dict_get(ctx, root, PDF_NAME_Outlines);
first = pdf_dict_get(ctx, obj, PDF_NAME_First);
if (first)
outline = pdf_load_outline_imp(ctx, doc, first);
}
fz_always(ctx)
pdf_drop_page_tree(ctx, doc);
fz_catch(ctx)
fz_rethrow(ctx);
return outline;
}
static fz_outline *
pdf_load_outline_imp(pdf_xref *xref, fz_obj *dict)
{
pdf_link *link;
fz_outline *node;
fz_obj *obj;
/* SumatraPDF: prevent potential stack overflow */
fz_outline *prev, *root = NULL;
fz_obj *origDict = dict;
fz_context *ctx = xref->ctx;
if (fz_is_null(ctx, dict))
return NULL;
/* SumatraPDF: prevent cyclic outlines */
do
{
if (fz_dict_gets(ctx, dict, ".seen"))
break;
obj = fz_new_null(ctx);
fz_dict_puts(ctx, dict, ".seen", obj);
fz_drop_obj(ctx, obj);
node = fz_malloc(ctx, sizeof(fz_outline));
node->title = NULL;
node->page = -1;
node->down = NULL;
node->next = NULL;
obj = fz_dict_gets(ctx, dict, "Title");
if (obj)
node->title = pdf_to_utf8(ctx, obj);
/* SumatraPDF: support expansion states */
node->is_open = fz_to_int(ctx, fz_dict_gets(ctx, dict, "Count")) >= 0;
/* SumatraPDF: extended outline actions */
node->data = node->free_data = NULL;
if (fz_dict_gets(ctx, dict, "Dest") || fz_dict_gets(ctx, dict, "A"))
{
link = pdf_load_link(xref, dict);
if (link) /* SumatraPDF: don't crash if it's no link after all */
{
if (link->kind == PDF_LINK_GOTO)
node->page = pdf_find_page_number(xref, fz_array_get(ctx, link->dest, 0));
/* SumatraPDF: extended outline actions */
node->data = link;
node->free_data = pdf_free_link;
}
}
obj = fz_dict_gets(ctx, dict, "First");
if (obj)
node->down = pdf_load_outline_imp(xref, obj);
/* SumatraPDF: prevent potential stack overflow */
if (!root)
prev = root = node;
else
prev = prev->next = node;
dict = fz_dict_gets(ctx, dict, "Next");
} while (dict && !fz_is_null(ctx, dict));
node = root;
/* SumatraPDF: prevent cyclic outlines */
for (dict = origDict; dict && fz_dict_gets(ctx, dict, ".seen"); dict = fz_dict_gets(ctx, dict, "Next"))
fz_dict_dels(ctx, dict, ".seen");
return node;
}
static fz_outline *
pdf_load_outline_imp(fz_context *ctx, pdf_document *doc, pdf_obj *dict)
{
fz_outline *node, **prev, *first;
pdf_obj *obj;
pdf_obj *odict = dict;
fz_var(dict);
fz_var(first);
fz_try(ctx)
{
first = NULL;
prev = &first;
while (dict && pdf_is_dict(ctx, dict))
{
if (pdf_mark_obj(ctx, dict))
break;
node = fz_new_outline(ctx);
*prev = node;
prev = &node->next;
obj = pdf_dict_get(ctx, dict, PDF_NAME_Title);
if (obj)
node->title = pdf_to_utf8(ctx, obj);
if ((obj = pdf_dict_get(ctx, dict, PDF_NAME_Dest)) != NULL)
node->uri = pdf_parse_link_dest(ctx, doc, obj);
else if ((obj = pdf_dict_get(ctx, dict, PDF_NAME_A)) != NULL)
node->uri = pdf_parse_link_action(ctx, doc, obj);
else
node->uri = NULL;
if (node->uri)
node->page = pdf_resolve_link(ctx, doc, node->uri, NULL, NULL);
else
node->page = -1;
obj = pdf_dict_get(ctx, dict, PDF_NAME_First);
if (obj)
{
node->down = pdf_load_outline_imp(ctx, doc, obj);
obj = pdf_dict_get(ctx, dict, PDF_NAME_Count);
if (pdf_to_int(ctx, obj) > 0)
node->is_open = 1;
}
dict = pdf_dict_get(ctx, dict, PDF_NAME_Next);
}
}
fz_always(ctx)
{
for (dict = odict; dict && pdf_obj_marked(ctx, dict); dict = pdf_dict_get(ctx, dict, PDF_NAME_Next))
pdf_unmark_obj(ctx, dict);
}
fz_catch(ctx)
{
fz_drop_outline(ctx, first);
fz_rethrow(ctx);
}
return first;
}