From e60815be290c2334e9122b10ac53b92b23e7f9a3 Mon Sep 17 00:00:00 2001
From: root <root>
Date: Fri, 1 May 2009 00:30:53 +0000
Subject: 3.5

---
 lzf_c.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'lzf_c.c')

diff --git a/lzf_c.c b/lzf_c.c
index 99dab09..0b5d816 100644
--- a/lzf_c.c
+++ b/lzf_c.c
@@ -170,12 +170,13 @@ lzf_compress (const void *const in_data, unsigned int in_len,
           unsigned int maxlen = in_end - ip - len;
           maxlen = maxlen > MAX_REF ? MAX_REF : maxlen;
 
+          if (expect_false (op + 3 + 1 >= out_end)) /* first a faster conservative test */
+            if (op - !lit + 3 + 1 >= out_end) /* second the exact but rare test */
+              return 0;
+
           op [- lit - 1] = lit - 1; /* stop run */
           op -= !lit; /* undo run if length is zero */
 
-          if (expect_false (op + 3 + 1 >= out_end))
-            return 0;
-
           for (;;)
             {
               if (expect_true (maxlen > 16))
-- 
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