From 151ee2f47bfdaa1273cdfd4855e937fb8f2e1d06 Mon Sep 17 00:00:00 2001
From: David Shaw <dshaw@jabberwocky.com>
Date: Sat, 29 Jun 2002 13:31:13 +0000
Subject: Update head to match stable 1.0

---
 zlib/inffast.c | 47 ++++++++++++++++++++++++++++++-----------------
 1 file changed, 30 insertions(+), 17 deletions(-)

(limited to 'zlib/inffast.c')

diff --git a/zlib/inffast.c b/zlib/inffast.c
index 61a78ee93..aa7f1d4d2 100644
--- a/zlib/inffast.c
+++ b/zlib/inffast.c
@@ -1,5 +1,5 @@
 /* inffast.c -- process literals and length/distance pairs fast
- * Copyright (C) 1995-1998 Mark Adler
+ * Copyright (C) 1995-2002 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -93,28 +93,41 @@ z_streamp z;
 
             /* do the copy */
             m -= c;
-            if ((uInt)(q - s->window) >= d)     /* offset before dest */
-            {                                   /*  just copy */
-              r = q - d;
-              *q++ = *r++;  c--;        /* minimum count is three, */
-              *q++ = *r++;  c--;        /*  so unroll loop a little */
-            }
-            else                        /* else offset after destination */
+            r = q - d;
+            if (r < s->window)                  /* wrap if needed */
             {
-              e = d - (uInt)(q - s->window); /* bytes from offset to end */
-              r = s->end - e;           /* pointer to offset */
-              if (c > e)                /* if source crosses, */
+              do {
+                r += s->end - s->window;        /* force pointer in window */
+              } while (r < s->window);          /* covers invalid distances */
+              e = s->end - r;
+              if (c > e)
               {
-                c -= e;                 /* copy to end of window */
+                c -= e;                         /* wrapped copy */
                 do {
-                  *q++ = *r++;
+                    *q++ = *r++;
                 } while (--e);
-                r = s->window;          /* copy rest from start of window */
+                r = s->window;
+                do {
+                    *q++ = *r++;
+                } while (--c);
               }
+              else                              /* normal copy */
+              {
+                *q++ = *r++;  c--;
+                *q++ = *r++;  c--;
+                do {
+                    *q++ = *r++;
+                } while (--c);
+              }
+            }
+            else                                /* normal copy */
+            {
+              *q++ = *r++;  c--;
+              *q++ = *r++;  c--;
+              do {
+                *q++ = *r++;
+              } while (--c);
             }
-            do {                        /* copy all or what's left */
-              *q++ = *r++;
-            } while (--c);
             break;
           }
           else if ((e & 64) == 0)
-- 
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