Update Zlib to version 1.2.8

third_party/zlib/inffast.c

 /* inffast.c -- fast decoding
- * Copyright (C) 1995-2008, 2010 Mark Adler
+ * Copyright (C) 1995-2008, 2010, 2013 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
 #include "zutil.h"
 #include "inftrees.h"
 #include "inflate.h"
 #include "inffast.h"
 
 #ifndef ASMINF
 
@@ skipping 49 matching lines @@
     - The maximum bytes that a single length/distance pair can output is 258
       bytes, which is the maximum length that can be coded.  inflate_fast()
       requires strm->avail_out >= 258 for each loop to avoid checking for
       output space.
  */
 void ZLIB_INTERNAL inflate_fast(strm, start)
 z_streamp strm;
 unsigned start;         /* inflate()'s starting value for strm->avail_out */
 {
     struct inflate_state FAR *state;
-    unsigned char FAR *in;      /* local strm->next_in */
-    unsigned char FAR *last;    /* while in < last, enough input available */
+    z_const unsigned char FAR *in;      /* local strm->next_in */
+    z_const unsigned char FAR *last;    /* have enough input while in < last */
     unsigned char FAR *out;     /* local strm->next_out */
     unsigned char FAR *beg;     /* inflate()'s initial strm->next_out */
     unsigned char FAR *end;     /* while out < end, enough space available */
 #ifdef INFLATE_STRICT
     unsigned dmax;              /* maximum distance from zlib header */
 #endif
     unsigned wsize;             /* window size or zero if not using window */
     unsigned whave;             /* valid bytes in the window */
     unsigned wnext;             /* window write index */
     unsigned char FAR *window;  /* allocated sliding window, if wsize != 0 */
@@ skipping 247 matching lines @@
    - Special case for distance > 1 copies to do overlapped load and store copy
    - Explicit branch predictions (based on measured branch probabilities)
    - Deferring match copy and interspersed it with decoding subsequent codes
    - Swapping literal/length else
    - Swapping window/direct else
    - Larger unrolled copy loops (three is about right)
    - Moving len -= 3 statement into middle of loop
  */
 
 #endif /* !ASMINF */