From e6485d384879c0f3c6bf8f53ff7559bd5e437a76 Mon Sep 17 00:00:00 2001
From: Melissa Linkert <melissa@glencoesoftware.com>
Date: Mon, 7 Aug 2023 10:33:04 -0500
Subject: [PATCH] IVision: improve version and data type checks in isThisType

Fixes #3582.
---
 .../formats-gpl/src/loci/formats/in/IvisionReader.java     | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/components/formats-gpl/src/loci/formats/in/IvisionReader.java b/components/formats-gpl/src/loci/formats/in/IvisionReader.java
index 4de6677c9d6..22b758de9b5 100644
--- a/components/formats-gpl/src/loci/formats/in/IvisionReader.java
+++ b/components/formats-gpl/src/loci/formats/in/IvisionReader.java
@@ -94,7 +94,12 @@ public boolean isThisType(RandomAccessInputStream stream) throws IOException {
     String version = stream.readString(3);
     try {
       Double.parseDouble(version);
-      return version.indexOf('.') != -1 && version.indexOf('-') == -1;
+      boolean validVersion = version.indexOf('.') != -1 && version.indexOf('-') == -1;
+      boolean validPatch = Character.isAlphabetic(stream.read());
+      stream.skipBytes(1);
+      int dataType = stream.read();
+      boolean validType = dataType >= 0 && dataType <= 8;
+      return validVersion && validPatch && validType;
     }
     catch (NumberFormatException e) { }
     return false;