From 1a3cc5bae03af4f6178fdcf322bfd4cd558b9080 Mon Sep 17 00:00:00 2001
From: Andreas Nygren <91531258+andnygIPG@users.noreply.github.com>
Date: Wed, 4 Oct 2023 15:19:18 +0200
Subject: [PATCH] Added checking of header inside the ERG file.

---
 index.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/index.ts b/index.ts
index a5ac5e3..90db997 100644
--- a/index.ts
+++ b/index.ts
@@ -134,6 +134,11 @@ function read(ergFile: string, infoFile: string) {
     byteOrder: headerBuffer.readUInt8(9),
   };
 
+  // Check format specified in the ERG header. Error if not ERG
+  if (!ergHeader.format.startsWith("CM-ERG")) {
+    throw new Error("Invalid ERG file");
+  }
+
   // process erg records by reading value for each quantity
   let recordBuffer = ergBuffer.slice(16);
   let recordIndex = 0;