imported zlib 1.1.4

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/ZLIB@26947 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/zlib/infcodes.c

@@ -1,6 +1,6 @@
 /* infcodes.c -- process literals and length/distance pairs
- * Copyright (C) 1995-1998 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h 
+ * Copyright (C) 1995-2002 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
 #include "zutil.h"
@@ -196,15 +196,9 @@ int r;
       Tracevv((stderr, "inflate:         distance %u\n", c->sub.copy.dist));
       c->mode = COPY;
     case COPY:          /* o: copying bytes in window, waiting for space */
-#ifndef __TURBOC__ /* Turbo C bug for following expression */
-      f = (uInt)(q - s->window) < c->sub.copy.dist ?
-          s->end - (c->sub.copy.dist - (q - s->window)) :
-          q - c->sub.copy.dist;
-#else
       f = q - c->sub.copy.dist;
-      if ((uInt)(q - s->window) < c->sub.copy.dist)
-        f = s->end - (c->sub.copy.dist - (uInt)(q - s->window));
-#endif
+      while (f < s->window)             /* modulo window size-"while" instead */
+        f += s->end - s->window;        /* of "if" handles invalid distances */
       while (c->len)
       {
         NEEDOUT
@@ -221,6 +215,13 @@ int r;
       c->mode = START;
       break;
     case WASH:          /* o: got eob, possibly more output */
+      if (k > 7)        /* return unused byte, if any */
+      {
+        Assert(k < 16, "inflate_codes grabbed too many bytes")
+        k -= 8;
+        n++;
+        p--;            /* can always return one */
+      }
       FLUSH
       if (s->read != s->write)
         LEAVE