From ef24c4c7502169f016dcd2a26923dbaf3216748c Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Fri, 8 Nov 2024 19:37:34 -0800
Subject: [PATCH] Reject invalid MAX_WBITS values at compile time.

---
 zutil.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/zutil.h b/zutil.h
index a27430a27..27ca69380 100644
--- a/zutil.h
+++ b/zutil.h
@@ -65,7 +65,9 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 /* To be used only when the state is known to be valid */
 
         /* common constants */
-
+#if MAX_WBITS < 9 || MAX_WBITS > 15
+#  error MAX_WBITS must be in 9..15
+#endif
 #ifndef DEF_WBITS
 #  define DEF_WBITS MAX_WBITS
 #endif