don't unread when nothing was read

apache · Oct 20, 2022 · b4f0826 · b4f0826
1 parent 0841ec3
commit b4f0826
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/main/java/org/apache/maven/plugins/shade/DefaultShader.java b/src/main/java/org/apache/maven/plugins/shade/DefaultShader.java
@@ -181,7 +181,10 @@ public boolean hasZipHeader() throws IOException
         {
             final byte[] header = new byte[HEADER_LEN];
             int len = super.read( header, 0, HEADER_LEN );
-            super.unread( header, 0, len );
+            if ( len != -1 )
+            {
+                super.unread( header, 0, len );
+            }
             return Arrays.equals( header, ZIP_HEADER );
         }
     }