Update zlib to 1.2.11

third_party/zlib/gzguts.h

 /* gzguts.h -- zlib internal header definitions for gz* operations
- * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
+ * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
 #ifdef _LARGEFILE64_SOURCE
 #  ifndef _LARGEFILE_SOURCE
 #    define _LARGEFILE_SOURCE 1
 #  endif
 #  ifdef _FILE_OFFSET_BITS
 #    undef _FILE_OFFSET_BITS
 #  endif
 #endif
 
 #ifdef HAVE_HIDDEN
 #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
 #else
 #  define ZLIB_INTERNAL
 #endif
 
 #include <stdio.h>
 #include "zlib.h"
 #ifdef STDC
 #  include <string.h>
 #  include <stdlib.h>
 #  include <limits.h>
 #endif
+
+#ifndef _POSIX_SOURCE
+#  define _POSIX_SOURCE
+#endif
 #include <fcntl.h>
 
 #ifdef _WIN32
 #  include <stddef.h>
 #endif
 
 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
 #  include <io.h>
 #endif
 
+#if defined(_WIN32) || defined(__CYGWIN__)
+#  define WIDECHAR
+#endif
+
 #ifdef WINAPI_FAMILY
 #  define open _open
 #  define read _read
 #  define write _write
 #  define close _close
 #endif
 
 #ifdef NO_DEFLATE       /* for compatibility with old definition */
 #  define NO_GZCOMPRESS
 #endif
@@ skipping 40 matching lines @@
 #    define NO_vsnprintf
 #  endif
 #  ifdef __OS400__
 #    define NO_vsnprintf
 #  endif
 #  ifdef __MVS__
 #    define NO_vsnprintf
 #  endif
 #endif
 
-/* unlike snprintf (which is required in C99, yet still not supported by
-   Microsoft more than a decade later!), _snprintf does not guarantee null
-   termination of the result -- however this is only used in gzlib.c where
+/* unlike snprintf (which is required in C99), _snprintf does not guarantee
+   null termination of the result -- however this is only used in gzlib.c where
    the result is assured to fit in the space provided */
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && _MSC_VER < 1900
 #  define snprintf _snprintf
 #endif
 
 #ifndef local
 #  define local static
 #endif
-/* compile with -Dlocal if your debugger can't find static symbols */
+/* since "static" is used to mean two completely different things in C, we
+   define "local" for the non-static meaning of "static", for readability
+   (compile with -Dlocal if your debugger can't find static symbols) */
 
 /* gz* functions always use library allocation functions */
 #ifndef STDC
   extern voidp  malloc OF((uInt size));
   extern void   free   OF((voidpf ptr));
 #endif
 
 /* get errno and strerror definition */
 #if defined UNDER_CE
 #  include <windows.h>
@@ skipping 43 matching lines @@
     struct gzFile_s x;      /* "x" for exposed */
                             /* x.have: number of bytes available at x.next */
                             /* x.next: next output data to deliver or write */
                             /* x.pos: current position in uncompressed data */
         /* used for both reading and writing */
     int mode;               /* see gzip modes above */
     int fd;                 /* file descriptor */
     char *path;             /* path or fd for error messages */
     unsigned size;          /* buffer size, zero if not allocated yet */
     unsigned want;          /* requested buffer size, default is GZBUFSIZE */
-    unsigned char *in;      /* input buffer */
+    unsigned char *in;      /* input buffer (double-sized when writing) */
     unsigned char *out;     /* output buffer (double-sized when reading) */
     int direct;             /* 0 if processing gzip, 1 if transparent */
         /* just for reading */
     int how;                /* 0: get header, 1: copy, 2: decompress */
     z_off64_t start;        /* where the gzip data started, for rewinding */
     int eof;                /* true if end of input file reached */
     int past;               /* true if read requested past end */
         /* just for writing */
     int level;              /* compression level */
     int strategy;           /* compression strategy */
@@ skipping 16 matching lines @@
 
 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
    value -- needed when comparing unsigned to z_off64_t, which is signed
    (possible z_off64_t types off_t, off64_t, and long are all signed) */
 #ifdef INT_MAX
 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
 #else
 unsigned ZLIB_INTERNAL gz_intmax OF((void));
 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
 #endif