From 1f45d0b36a01df2dc2ae3601901e40d4b865f47e Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers3@gmail.com>
Date: Fri, 31 Dec 2021 16:04:49 -0600
Subject: [PATCH] deflate_constants: define constant for window order

---
 lib/deflate_compress.c  | 8 ++------
 lib/deflate_constants.h | 3 +++
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/lib/deflate_compress.c b/lib/deflate_compress.c
index 3255968..b2d6b5d 100644
--- a/lib/deflate_compress.c
+++ b/lib/deflate_compress.c
@@ -49,12 +49,8 @@
  */
 #define USE_FULL_OFFSET_SLOT_FAST	SUPPORT_NEAR_OPTIMAL_PARSING
 
-/*
- * DEFLATE uses a 32768 byte sliding window; set the matchfinder parameters
- * appropriately.
- */
-#define MATCHFINDER_WINDOW_ORDER	15
-
+/* Include the needed matchfinders. */
+#define MATCHFINDER_WINDOW_ORDER	DEFLATE_WINDOW_ORDER
 #include "hc_matchfinder.h"
 #if SUPPORT_NEAR_OPTIMAL_PARSING
 #  include "bt_matchfinder.h"
diff --git a/lib/deflate_constants.h b/lib/deflate_constants.h
index 5556aaf..5982c15 100644
--- a/lib/deflate_constants.h
+++ b/lib/deflate_constants.h
@@ -17,6 +17,9 @@
 /* Maximum supported match offset (in bytes) */
 #define DEFLATE_MAX_MATCH_OFFSET		32768
 
+/* log2 of DEFLATE_MAX_MATCH_OFFSET */
+#define DEFLATE_WINDOW_ORDER			15
+
 /* Number of symbols in each Huffman code.  Note: for the literal/length
  * and offset codes, these are actually the maximum values; a given block
  * might use fewer symbols.  */