[master] 39233521d Track libz changes

[Poul-Henning Kamp]

commit 39233521d3669206c94deedae1915b365dc6d6b8
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Mon Nov 24 14:00:13 2025 +0000

    Track libz changes

diff --git a/lib/libvgz/deflate.c b/lib/libvgz/deflate.c
index 05a2d4517..a3c8935b8 100644
--- a/lib/libvgz/deflate.c
+++ b/lib/libvgz/deflate.c
@@ -1792,8 +1792,10 @@ local block_state deflate_stored(deflate_state *s, int flush) {
         s->high_water = s->strstart;
 
     /* If the last block was written to next_out, then done. */
-    if (last)
+    if (last) {
+        s->bi_used = 8;
         return finish_done;
+    }
 
     /* If flushing and all input has been consumed, then done. */
     if (flush != Z_NO_FLUSH && flush != Z_FINISH &&
@@ -1845,6 +1847,8 @@ local block_state deflate_stored(deflate_state *s, int flush) {
     }
 
     /* We've done all we can with the available input and output. */
+    if (last)
+        s->bi_used = 8;
     return last ? finish_started : need_more;
 }
 
diff --git a/lib/libvgz/zconf.h b/lib/libvgz/zconf.h
index 4a52aed7c..2c7991abf 100644
--- a/lib/libvgz/zconf.h
+++ b/lib/libvgz/zconf.h
@@ -235,10 +235,12 @@
 #  endif
 #endif
 
-#if defined(ZLIB_CONST) && !defined(z_const)
-#  define z_const const
-#else
-#  define z_const
+#ifndef z_const
+#  ifdef ZLIB_CONST
+#    define z_const const
+#  else
+#    define z_const
+#  endif
 #endif
 
 #ifdef Z_SOLO
@@ -434,11 +436,11 @@ typedef uLong FAR uLongf;
    typedef unsigned long z_crc_t;
 #endif
 
-#ifdef HAVE_UNISTD_H    /* may be set to #if 1 by ./configure */
+#if HAVE_UNISTD_H-0    /* may be set to #if 1 by ./configure */
 #  define Z_HAVE_UNISTD_H
 #endif
 
-#ifdef HAVE_STDARG_H    /* may be set to #if 1 by ./configure */
+#if HAVE_STDARG_H-0    /* may be set to #if 1 by ./configure */
 #  define Z_HAVE_STDARG_H
 #endif
 
diff --git a/lib/libvgz/zutil.h b/lib/libvgz/zutil.h
index c095a04d1..0dfa02357 100644
--- a/lib/libvgz/zutil.h
+++ b/lib/libvgz/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