From: Mika Lindqvist <postmaster@raasu.org>
Date: Tue, 14 Feb 2017 07:51:32 +0000 (+0200)
Subject: Use insert_string instead of UPDATE_HASH to avoid double hashing.
X-Git-Tag: 1.9.9-b1~681
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=07baa6200529c489baa40031285ada969e5d669f;p=thirdparty%2Fzlib-ng.git

Use insert_string instead of UPDATE_HASH to avoid double hashing.
---

diff --git a/deflate.c b/deflate.c
index ab3565089..72da7e84e 100644
--- a/deflate.c
+++ b/deflate.c
@@ -1253,14 +1253,12 @@ void fill_window_c(deflate_state *s) {
             unsigned int str = s->strstart - s->insert;
             s->ins_h = s->window[str];
             if (str >= 1)
-                UPDATE_HASH(s, s->ins_h, str + 1 - (MIN_MATCH-1));
+                insert_string(s, str + 2 - MIN_MATCH, 1);
 #if MIN_MATCH != 3
-            Call UPDATE_HASH() MIN_MATCH-3 more times
+#warning    Call insert_string() MIN_MATCH-3 more times
 #endif
             while (s->insert) {
-                UPDATE_HASH(s, s->ins_h, str);
-                s->prev[str & s->w_mask] = s->head[s->ins_h];
-                s->head[s->ins_h] = (Pos)str;
+                insert_string(s, str, 1);
                 str++;
                 s->insert--;
                 if (s->lookahead + s->insert < MIN_MATCH)