From 041a2c827efbf2ed0931426129e38aef9412177f Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Tue, 5 Jan 2016 14:21:46 +0100
Subject: Separate pdf_drop_annots (that drops lists) and fz_drop_annot.

---
 source/fitz/document.c      | 21 +++++++++++++++++++++
 source/pdf/pdf-annot-edit.c |  4 ++--
 source/pdf/pdf-annot.c      | 25 ++++++++++++++-----------
 source/pdf/pdf-form.c       |  2 +-
 source/pdf/pdf-page.c       |  6 +++---
 5 files changed, 41 insertions(+), 17 deletions(-)

(limited to 'source')

diff --git a/source/fitz/document.c b/source/fitz/document.c
index b902161c..319ac83b 100644
--- a/source/fitz/document.c
+++ b/source/fitz/document.c
@@ -369,6 +369,27 @@ fz_new_annot(fz_context *ctx, int size)
 	return page;
 }
 
+fz_annot *
+fz_keep_annot(fz_context *ctx, fz_annot *annot)
+{
+	if (annot)
+		++annot->refs;
+	return annot;
+}
+
+void
+fz_drop_annot(fz_context *ctx, fz_annot *annot)
+{
+	if (annot)
+	{
+		if (--annot->refs == 0 && annot->drop_annot_imp)
+		{
+			annot->drop_annot_imp(ctx, annot);
+			fz_free(ctx, annot);
+		}
+	}
+}
+
 void *
 fz_new_page(fz_context *ctx, int size)
 {
diff --git a/source/pdf/pdf-annot-edit.c b/source/pdf/pdf-annot-edit.c
index aef14e6f..6b085055 100644
--- a/source/pdf/pdf-annot-edit.c
+++ b/source/pdf/pdf-annot-edit.c
@@ -138,7 +138,7 @@ pdf_create_annot(fz_context *ctx, pdf_document *doc, pdf_page *page, fz_annot_ty
 
 		/*
 			Linking must be done after any call that might throw because
-			pdf_drop_annot below actually frees a list. Put the new annot
+			pdf_drop_annots below actually frees a list. Put the new annot
 			at the end of the list, so that it will be drawn last.
 		*/
 		*page->annot_tailp = annot;
@@ -153,7 +153,7 @@ pdf_create_annot(fz_context *ctx, pdf_document *doc, pdf_page *page, fz_annot_ty
 	}
 	fz_catch(ctx)
 	{
-		pdf_drop_annot(ctx, annot);
+		pdf_drop_annots(ctx, annot);
 		fz_rethrow(ctx);
 	}
 
diff --git a/source/pdf/pdf-annot.c b/source/pdf/pdf-annot.c
index bfdfe306..84b0c3e1 100644
--- a/source/pdf/pdf-annot.c
+++ b/source/pdf/pdf-annot.c
@@ -384,17 +384,20 @@ pdf_load_link_annots(fz_context *ctx, pdf_document *doc, pdf_obj *annots, const
 }
 
 void
-pdf_drop_annot(fz_context *ctx, pdf_annot *annot)
+pdf_drop_annot_imp(fz_context *ctx, pdf_annot *annot)
 {
-	pdf_annot *next;
+	if (annot->ap)
+		pdf_drop_xobject(ctx, annot->ap);
+	pdf_drop_obj(ctx, annot->obj);
+}
 
+void
+pdf_drop_annots(fz_context *ctx, pdf_annot *annot)
+{
 	while (annot)
 	{
-		next = annot->next;
-		if (annot->ap)
-			pdf_drop_xobject(ctx, annot->ap);
-		pdf_drop_obj(ctx, annot->obj);
-		fz_free(ctx, annot);
+		pdf_annot *next = annot->next;
+		fz_drop_annot(ctx, (fz_annot*)annot);
 		annot = next;
 	}
 }
@@ -519,7 +522,7 @@ pdf_load_annots(fz_context *ctx, pdf_document *doc, pdf_page *page, pdf_obj *ann
 	}
 	fz_catch(ctx)
 	{
-		pdf_drop_annot(ctx, page->annots);
+		pdf_drop_annots(ctx, page->annots);
 		page->annots = NULL;
 		fz_rethrow(ctx);
 	}
@@ -592,7 +595,7 @@ pdf_load_annots(fz_context *ctx, pdf_document *doc, pdf_page *page, pdf_obj *ann
 		{
 			if (fz_caught(ctx) == FZ_ERROR_TRYLATER)
 			{
-				pdf_drop_annot(ctx, page->annots);
+				pdf_drop_annots(ctx, page->annots);
 				page->annots = NULL;
 				fz_rethrow(ctx);
 			}
@@ -603,8 +606,8 @@ pdf_load_annots(fz_context *ctx, pdf_document *doc, pdf_page *page, pdf_obj *ann
 		{
 			/* Move to next item in the linked list, dropping this one */
 			*itr = annot->next;
-			annot->next = NULL; /* Required because pdf_drop_annot follows the "next" chain */
-			pdf_drop_annot(ctx, annot);
+			annot->next = NULL; /* Required because pdf_drop_annots follows the "next" chain */
+			pdf_drop_annots(ctx, annot);
 		}
 	}
 
diff --git a/source/pdf/pdf-form.c b/source/pdf/pdf-form.c
index 9a2d35d9..1f101007 100644
--- a/source/pdf/pdf-form.c
+++ b/source/pdf/pdf-form.c
@@ -680,7 +680,7 @@ void pdf_update_page(fz_context *ctx, pdf_document *doc, pdf_page *page)
 	*/
 	if (page->tmp_annots)
 	{
-		pdf_drop_annot(ctx, page->tmp_annots);
+		pdf_drop_annots(ctx, page->tmp_annots);
 		page->tmp_annots = NULL;
 	}
 
diff --git a/source/pdf/pdf-page.c b/source/pdf/pdf-page.c
index d763b8c8..dcb0add4 100644
--- a/source/pdf/pdf-page.c
+++ b/source/pdf/pdf-page.c
@@ -405,11 +405,11 @@ pdf_drop_page_imp(fz_context *ctx, pdf_page *page)
 	if (page->links)
 		fz_drop_link(ctx, page->links);
 	if (page->annots)
-		pdf_drop_annot(ctx, page->annots);
+		pdf_drop_annots(ctx, page->annots);
 	if (page->deleted_annots)
-		pdf_drop_annot(ctx, page->deleted_annots);
+		pdf_drop_annots(ctx, page->deleted_annots);
 	if (page->tmp_annots)
-		pdf_drop_annot(ctx, page->tmp_annots);
+		pdf_drop_annots(ctx, page->tmp_annots);
 	/* doc->focus, when not NULL, refers to one of
 	 * the annotations and must be NULLed when the
 	 * annotations are destroyed. doc->focus_obj
-- 
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