From db0ead70a4370d7f5b8dfa605c5b85af8068b9fd Mon Sep 17 00:00:00 2001
From: cemonneau <57847267+cemonneau@users.noreply.github.com>
Date: Thu, 11 Nov 2021 20:12:06 +0100
Subject: [PATCH] Fix image parsing when the upgrade file identifier is not at
 position 0 (#59)

---
 lib/ota.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/ota.js b/lib/ota.js
index de81648..42741b5 100644
--- a/lib/ota.js
+++ b/lib/ota.js
@@ -8,7 +8,10 @@ function parseSubElement(buffer, position) {
     return {tagID, length, data};
 }
 
-function parseImage(buffer) {
+function parseImage(rawBuffer) {
+    const start = rawBuffer.indexOf(upgradeFileIdentifier);
+    const buffer = rawBuffer.slice(start);
+
     const header = {
         otaUpgradeFileIdentifier: buffer.subarray(0, 4),
         otaHeaderVersion: buffer.readUInt16LE(4),
@@ -55,4 +58,4 @@ function parseImage(buffer) {
 
 module.exports = {
     parseImage
-};
\ No newline at end of file
+};