From e875c7da44a72d49d05a9a0707157605cd52f693 Mon Sep 17 00:00:00 2001
From: Nathan Fiedler <nathanfiedler@fastmail.fm>
Date: Wed, 27 May 2020 18:29:41 -0700
Subject: [PATCH] Skip over unknown boxes (#4)

* Skip over unknown boxes

If the box size is non-zero, skip over it and continue reading. Otherwise if
the box size is zero, exit the loop.

* Add comment clarifying the box skipping
---
 src/lib.rs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index d5286ec..bf9ea55 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -83,7 +83,15 @@ fn read_boxes(f: File) -> Result<BMFF> {
             BoxType::MoofBox => {
                 start = (size as u32 - HEADER_SIZE) as u64;
             }
-            _ => break
+            _ => {
+                // Skip over unsupported boxes, but stop if the size is zero,
+                // meaning the last box has been reached.
+                if size == 0 {
+                    break;
+                } else {
+                    start = (size as u32 - HEADER_SIZE) as u64;
+                }
+            }
         };
     }
     Ok(bmff)