From 771e486b590a03d9a0948e0c207bc49d5d10931b Mon Sep 17 00:00:00 2001
From: Paul Allen <pallen@perforce.com>
Date: Tue, 24 Sep 2024 09:56:19 +0100
Subject: [PATCH] Update
 imageio/imageio-dds/src/main/java/com/twelvemonkeys/imageio/plugins/dds/DDSHeader.java

Improve Magic IIOException

Co-authored-by: Harald Kuhr <harald.kuhr@gmail.com>
---
 .../java/com/twelvemonkeys/imageio/plugins/dds/DDSHeader.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/imageio/imageio-dds/src/main/java/com/twelvemonkeys/imageio/plugins/dds/DDSHeader.java b/imageio/imageio-dds/src/main/java/com/twelvemonkeys/imageio/plugins/dds/DDSHeader.java
index ca204611..916e72d4 100644
--- a/imageio/imageio-dds/src/main/java/com/twelvemonkeys/imageio/plugins/dds/DDSHeader.java
+++ b/imageio/imageio-dds/src/main/java/com/twelvemonkeys/imageio/plugins/dds/DDSHeader.java
@@ -31,7 +31,7 @@ public final class DDSHeader {
 		byte[] magic = new byte[DDS.MAGIC.length];
 		imageInput.readFully(magic);
 		if (!Arrays.equals(DDS.MAGIC, magic)) {
-			throw new IIOException("Unsupported MAGIC bytes.");
+			throw new IIOException(String.format("Not a DDS file. Expected DDS magic %02x, read %02x", DDS.MAGIC, magic));
 		}
 
 		// DDS_HEADER structure