From 42a096d455e0eaaa80f1344024df0d36c106de80 Mon Sep 17 00:00:00 2001
From: zii-dmg <master-chi@mail.ru>
Date: Wed, 25 Jan 2023 01:15:00 +0300
Subject: [PATCH] Fixed dictionary null access (#276)

Fixes #200
---
 src/Zlib.Shared/Deflate.cs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/Zlib.Shared/Deflate.cs b/src/Zlib.Shared/Deflate.cs
index 9672250..9950b6a 100644
--- a/src/Zlib.Shared/Deflate.cs
+++ b/src/Zlib.Shared/Deflate.cs
@@ -1667,12 +1667,12 @@ internal int SetParams(CompressionLevel level, CompressionStrategy strategy)
 
         internal int SetDictionary(byte[] dictionary)
         {
-            int length = dictionary.Length;
-            int index = 0;
-
             if (dictionary == null || status != INIT_STATE)
                 throw new ZlibException("Stream error.");
 
+            int length = dictionary.Length;
+            int index = 0;
+
             _codec._Adler32 = Adler.Adler32(_codec._Adler32, dictionary, 0, dictionary.Length);
 
             if (length < MIN_MATCH)
@@ -1876,4 +1876,4 @@ internal int Deflate(FlushType flush)
         }
 
     }
-}
\ No newline at end of file
+}