From: Dougall Johnson <dougallj@gmail.com>
Date: Sun, 28 Dec 2025 23:41:02 +0000 (-0800)
Subject: Consume bits before branches in inflate_fast.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=56b8a0d400e8f83ab249df412c5b47724efadc19;p=thirdparty%2Fzlib-ng.git

Consume bits before branches in inflate_fast.
---

diff --git a/inffast_tpl.h b/inffast_tpl.h
index 4798d81eb..4b1447cb7 100644
--- a/inffast_tpl.h
+++ b/inffast_tpl.h
@@ -151,20 +151,20 @@ void Z_INTERNAL INFLATE_FAST(PREFIX3(stream) *strm, uint32_t start) {
         REFILL();
         here = lcode[hold & lmask];
         Z_TOUCH(here);
+        DROPBITS(here.bits);
         if (here.op == 0) {
             *out++ = (unsigned char)(here.val);
-            DROPBITS(here.bits);
             here = lcode[hold & lmask];
             Z_TOUCH(here);
+            DROPBITS(here.bits);
             if (here.op == 0) {
                 *out++ = (unsigned char)(here.val);
-                DROPBITS(here.bits);
                 here = lcode[hold & lmask];
                 Z_TOUCH(here);
+                DROPBITS(here.bits);
             }
         }
       dolen:
-        DROPBITS(here.bits);
         op = here.op;
         if (op == 0) {                          /* literal */
             Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
@@ -291,6 +291,7 @@ void Z_INTERNAL INFLATE_FAST(PREFIX3(stream) *strm, uint32_t start) {
         } else if ((op & 64) == 0) {              /* 2nd level length code */
             here = lcode[here.val + BITS(op)];
             Z_TOUCH(here);
+            DROPBITS(here.bits);
             goto dolen;
         } else if (op & 32) {                     /* end-of-block */
             Tracevv((stderr, "inflate:         end of block\n"));