When updating an xobject's contents also reset the Length

1 files changed, 20 insertions, 2 deletions

diff --git a/pdf/pdf_xobject.c b/pdf/pdf_xobject.c
index 6af7d951..3777602d 100644
--- a/pdf/pdf_xobject.c
+++ b/pdf/pdf_xobject.c
@@ -226,6 +226,24 @@ pdf_new_xobject(pdf_document *xref, fz_rect *bbox, fz_matrix *mat)
 
 void pdf_update_xobject_contents(pdf_document *xref, pdf_xobject *form, fz_buffer *buffer)
 {
-	pdf_dict_dels(form->contents, "Filter");
-	pdf_update_stream(xref, pdf_to_num(form->contents), buffer);
+	fz_context *ctx = xref->ctx;
+	pdf_obj *len = NULL;
+
+	fz_var(len);
+
+	fz_try(ctx)
+	{
+		len = pdf_new_int(ctx, buffer->len);
+		pdf_dict_dels(form->contents, "Filter");
+		pdf_dict_puts(form->contents, "Length", len);
+		pdf_update_stream(xref, pdf_to_num(form->contents), buffer);
+	}
+	fz_always(ctx)
+	{
+		pdf_drop_obj(len);
+	}
+	fz_catch(ctx)
+	{
+		fz_rethrow(ctx);
+	}
 }