From 66c961010db971fc7446294938b38843456308bb Mon Sep 17 00:00:00 2001
From: Sebastian Rasmussen <sebras@gmail.com>
Date: Tue, 10 Jan 2012 19:44:31 +0100
Subject: Automatically load page tree when accessing a page/page count.

---
 apps/pdfapp.c   |  9 ---------
 apps/pdfclean.c |  3 ---
 apps/pdfdraw.c  |  9 ---------
 apps/pdfinfo.c  |  1 -
 apps/pdfshow.c  |  3 ---
 pdf/mupdf.h     |  1 -
 pdf/pdf_page.c  | 53 ++++++++++++++++++++++++++++++++---------------------
 7 files changed, 32 insertions(+), 47 deletions(-)

diff --git a/apps/pdfapp.c b/apps/pdfapp.c
index f8c9c79e..053d120d 100644
--- a/apps/pdfapp.c
+++ b/apps/pdfapp.c
@@ -164,15 +164,6 @@ static void pdfapp_open_pdf(pdfapp_t *app, char *filename, int fd)
 	 * Start at first page
 	 */
 
-	fz_try(ctx)
-	{
-		pdf_load_page_tree(app->xref);
-	}
-	fz_catch(ctx)
-	{
-		pdfapp_error(app, "cannot load page tree");
-	}
-
 	app->pagecount = pdf_count_pages(app->xref);
 
 	app->outline = pdf_load_outline(app->xref);
diff --git a/apps/pdfclean.c b/apps/pdfclean.c
index f0a33918..2e7aa732 100644
--- a/apps/pdfclean.c
+++ b/apps/pdfclean.c
@@ -290,9 +290,6 @@ static void retainpages(int argc, char **argv)
 {
 	fz_obj *oldroot, *root, *pages, *kids, *countobj, *parent, *olddests;
 
-	/* Load the old page tree */
-	pdf_load_page_tree(xref);
-
 	/* Keep only pages/type and (reduced) dest entries to avoid
 	 * references to unretained pages */
 	oldroot = fz_dict_gets(xref->trailer, "Root");
diff --git a/apps/pdfdraw.c b/apps/pdfdraw.c
index 91d09c6c..cc125a69 100644
--- a/apps/pdfdraw.c
+++ b/apps/pdfdraw.c
@@ -455,15 +455,6 @@ int main(int argc, char **argv)
 				fz_throw(ctx, "cannot open document: %s", filename);
 			}
 
-			fz_try(ctx)
-			{
-				pdf_load_page_tree(xref);
-			}
-			fz_catch(ctx)
-			{
-				fz_throw(ctx, "cannot load page tree: %s", filename);
-			}
-
 			if (showxml)
 				printf("<document name=\"%s\">\n", filename);
 
diff --git a/apps/pdfinfo.c b/apps/pdfinfo.c
index 049e4617..054f0985 100644
--- a/apps/pdfinfo.c
+++ b/apps/pdfinfo.c
@@ -994,7 +994,6 @@ int main(int argc, char **argv)
 			filename = argv[fz_optind];
 			printf("%s:\n", filename);
 			xref = pdf_open_xref(ctx, filename, password);
-			pdf_load_page_tree(xref);
 			pagecount = pdf_count_pages(xref);
 
 			showglobalinfo();
diff --git a/apps/pdfshow.c b/apps/pdfshow.c
index e10e5e08..300da9ca 100644
--- a/apps/pdfshow.c
+++ b/apps/pdfshow.c
@@ -46,9 +46,6 @@ static void showpagetree(void)
 	if (!xref)
 		fz_throw(ctx, "no file specified");
 
-	if (!xref->page_len)
-		pdf_load_page_tree(xref);
-
 	count = pdf_count_pages(xref);
 	for (i = 0; i < count; i++)
 	{
diff --git a/pdf/mupdf.h b/pdf/mupdf.h
index cd3c1d82..d9a6b7c6 100644
--- a/pdf/mupdf.h
+++ b/pdf/mupdf.h
@@ -451,7 +451,6 @@ struct pdf_page_s
 	pdf_annot *annots;
 };
 
-void pdf_load_page_tree(pdf_xref *xref);
 int pdf_find_page_number(pdf_xref *xref, fz_obj *pageobj);
 int pdf_count_pages(pdf_xref *xref);
 
diff --git a/pdf/pdf_page.c b/pdf/pdf_page.c
index 81e89e7f..e8b27ccc 100644
--- a/pdf/pdf_page.c
+++ b/pdf/pdf_page.c
@@ -9,22 +9,6 @@ struct info
 	fz_obj *rotate;
 };
 
-int
-pdf_count_pages(pdf_xref *xref)
-{
-	return xref->page_len;
-}
-
-int
-pdf_find_page_number(pdf_xref *xref, fz_obj *page)
-{
-	int i, num = fz_to_num(page);
-	for (i = 0; i < xref->page_len; i++)
-		if (num == fz_to_num(xref->page_refs[i]))
-			return i;
-	return -1;
-}
-
 static void
 put_marker_bool(fz_context *ctx, fz_obj *rdb, char *marker, int val)
 {
@@ -116,14 +100,21 @@ pdf_load_page_tree_node(pdf_xref *xref, fz_obj *node, struct info info)
 	fz_dict_unmark(node);
 }
 
-void
+static void
 pdf_load_page_tree(pdf_xref *xref)
 {
-	struct info info;
 	fz_context *ctx = xref->ctx;
-	fz_obj *catalog = fz_dict_gets(xref->trailer, "Root");
-	fz_obj *pages = fz_dict_gets(catalog, "Pages");
-	fz_obj *count = fz_dict_gets(pages, "Count");
+	fz_obj *catalog;
+	fz_obj *pages;
+	fz_obj *count;
+	struct info info;
+
+	if (xref->page_len)
+		return;
+
+	catalog = fz_dict_gets(xref->trailer, "Root");
+	pages = fz_dict_gets(catalog, "Pages");
+	count = fz_dict_gets(pages, "Count");
 
 	if (!fz_is_dict(pages))
 		fz_throw(ctx, "missing page tree");
@@ -143,6 +134,25 @@ pdf_load_page_tree(pdf_xref *xref)
 	pdf_load_page_tree_node(xref, pages, info);
 }
 
+int
+pdf_count_pages(pdf_xref *xref)
+{
+	pdf_load_page_tree(xref);
+	return xref->page_len;
+}
+
+int
+pdf_find_page_number(pdf_xref *xref, fz_obj *page)
+{
+	int i, num = fz_to_num(page);
+
+	pdf_load_page_tree(xref);
+	for (i = 0; i < xref->page_len; i++)
+		if (num == fz_to_num(xref->page_refs[i]))
+			return i;
+	return -1;
+}
+
 /* We need to know whether to install a page-level transparency group */
 
 static int pdf_resources_use_blending(fz_context *ctx, fz_obj *rdb);
@@ -303,6 +313,7 @@ pdf_load_page(pdf_xref *xref, int number)
 	fz_rect mediabox, cropbox;
 	fz_context *ctx = xref->ctx;
 
+	pdf_load_page_tree(xref);
 	if (number < 0 || number >= xref->page_len)
 		fz_throw(ctx, "cannot find page %d", number + 1);
 
-- 
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