From e78d9e2373d368f71f972d65c85e2ccf1e07c9dc Mon Sep 17 00:00:00 2001
From: John Whitington <john@coherentgraphics.co.uk>
Date: Thu, 18 Dec 2014 17:58:26 +0000
Subject: [PATCH] Error handling for -revisions with malformed files

---
 cpdfcommand.ml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/cpdfcommand.ml b/cpdfcommand.ml
index 7e411c2..adcd9ee 100644
--- a/cpdfcommand.ml
+++ b/cpdfcommand.ml
@@ -2994,7 +2994,11 @@ let go () =
         | (StdIn, _, _, _, _, _)::_ -> Pdfio.input_of_channel stdin
         | _ -> raise (Arg.Bad "Revisions: must be a filename or stdin")
       in
-        Printf.printf "%i\n%!" (Pdfread.revisions input) 
+        begin try
+          Printf.printf "%i\n%!" (Pdfread.revisions input) 
+        with
+          _ -> soft_error "Malformed XRef table. Cannot determine number of revisions."
+        end
   | Some Clean ->
       begin match args.out with
       | (File _ | Stdout) ->