From 6e18081f5188576b1500552771c70e121097ca87 Mon Sep 17 00:00:00 2001
From: Anthony Jones <anthony@biteable.com>
Date: Wed, 16 Mar 2022 17:06:46 +1300
Subject: [PATCH] fix: added support for 64 bit atom sizes

---
 lib/mp4/find-box.js        | 14 ++++++++++++++
 lib/tools/mp4-inspector.js |  5 +++++
 2 files changed, 19 insertions(+)

diff --git a/lib/mp4/find-box.js b/lib/mp4/find-box.js
index eced28d1..32cf533d 100644
--- a/lib/mp4/find-box.js
+++ b/lib/mp4/find-box.js
@@ -18,6 +18,20 @@ var findBox = function(data, path) {
 
     type = parseType(data.subarray(i + 4, i + 8));
 
+    if (size === 1) {
+      size = toUnsigned(
+        data[i + 8] << 56 |
+        data[i + 9] << 48 |
+        data[i + 10] << 40 |
+        data[i + 11] << 32 |
+        data[i + 12] << 24 |
+        data[i + 13] << 16 |
+        data[i + 14] <<  8 |
+        data[i + 15]);
+      i += 8;
+      size -= 8;
+    }
+
     end = size > 1 ? i + size : data.byteLength;
 
     if (type === path[0]) {
diff --git a/lib/tools/mp4-inspector.js b/lib/tools/mp4-inspector.js
index 0acecb46..650eb4a7 100644
--- a/lib/tools/mp4-inspector.js
+++ b/lib/tools/mp4-inspector.js
@@ -661,6 +661,11 @@ inspectMp4 = function(data) {
     // parse box data
     size = view.getUint32(i);
     type =  parseType(data.subarray(i + 4, i + 8));
+    if (size === 1) {
+      size = getUint64(data.subarray(i + 8));
+      i += 8;
+      size -= 8;
+    }
     end = size > 1 ? i + size : data.byteLength;
 
     // parse type-specific data