From 2af57ab7b73f00127de081e1079b258a2ef97719 Mon Sep 17 00:00:00 2001
From: Kent Inverarity <kent.inverarity@sa.gov.au>
Date: Wed, 14 Jul 2021 17:08:04 +0930
Subject: [PATCH] Detect and raise Exception for LiDAR files

---
 lasio/las.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lasio/las.py b/lasio/las.py
index 676b3c3..18eb699 100644
--- a/lasio/las.py
+++ b/lasio/las.py
@@ -169,6 +169,12 @@ def read(
         try:
             file_obj, self.encoding = reader.open_file(file_ref, **kwargs)
 
+            test_lidar = file_obj.read(4)
+            if test_lidar == "LASF":
+                raise IOError("This is a LASer file (i.e. LiDAR data), not a Log ASCII Standard file")
+            else:
+                file_obj.seek(0)
+
             logger.debug(
                 "Fetching substitutions for read_policy {} and null policy {}".format(
                     read_policy, null_policy