Upgrade bundled zlib from 1.2.8 to 1.2.11

Release: 1.2.11 - January 15, 2017 For further details see README.bundled-libs.txt.
2020-01-04 00:03:46 +01:00 · 2020-01-04 00:03:46 +01:00 · 62cdfbcfa2
commit 62cdfbcfa2
parent bebb116a06
25 changed files with 1699 additions and 1035 deletions
--- a/CHANGES.txt
+++ b/CHANGES.txt
@ -98,6 +98,10 @@ Changes in FLTK 1.4.0					Released: ??? ?? 2019
  - FLTK's ABI version can be configured with 'configure' and CMake.
    See documentation in README.abi-version.txt.
  Bundled libraries
  - Bundled image libraries have been upgraded to newer versions.
    For details see README.bundled-libs.txt.
  1.4.0 ABI FEATURES
--- a/README.bundled-libs.txt
+++ b/README.bundled-libs.txt
@ -14,12 +14,12 @@ Current versions of bundled libraries:
  ** work in progress -- not yet completely upgraded **
-  Library       Version            Release date		FLTK Version
+  Library       Version            Release date		FLTK Version  Status
-  ------------------------------------------------------------------
+  --------------------------------------------------------------------------
  jpeg          jpeg-9c            2018-01-14           1.4.0
  nanosvg       f31098fa85 [1]     2019-05-23           1.4.0
  png           libpng-1.6.34      2017-09-29           1.4.0
-  zlib          zlib-1.2.11        2017-01-15           1.4.0
+  zlib          zlib-1.2.11        2017-01-15           1.4.0         DONE
 Previous versions of bundled libraries:
--- a/zlib/ChangeLog
+++ b/zlib/ChangeLog
@ -1,10 +1,53 @@
                ChangeLog file for zlib
 Changes in 1.2.11 (15 Jan 2017)
 - Fix deflate stored bug when pulling last block from window
 - Permit immediate deflateParams changes before any deflate input
 Changes in 1.2.10 (2 Jan 2017)
 - Avoid warnings on snprintf() return value
 - Fix bug in deflate_stored() for zero-length input
 - Fix bug in gzwrite.c that produced corrupt gzip files
 - Remove files to be installed before copying them in Makefile.in
 - Add warnings when compiling with assembler code
 Changes in 1.2.9 (31 Dec 2016)
 - Fix contrib/minizip to permit unzipping with desktop API [Zouzou]
 - Improve contrib/blast to return unused bytes
 - Assure that gzoffset() is correct when appending
 - Improve compress() and uncompress() to support large lengths
 - Fix bug in test/example.c where error code not saved
 - Remedy Coverity warning [Randers-Pehrson]
 - Improve speed of gzprintf() in transparent mode
 - Fix inflateInit2() bug when windowBits is 16 or 32
 - Change DEBUG macro to ZLIB_DEBUG
 - Avoid uninitialized access by gzclose_w()
 - Allow building zlib outside of the source directory
 - Fix bug that accepted invalid zlib header when windowBits is zero
 - Fix gzseek() problem on MinGW due to buggy _lseeki64 there
 - Loop on write() calls in gzwrite.c in case of non-blocking I/O
 - Add --warn (-w) option to ./configure for more compiler warnings
 - Reject a window size of 256 bytes if not using the zlib wrapper
 - Fix bug when level 0 used with Z_HUFFMAN or Z_RLE
 - Add --debug (-d) option to ./configure to define ZLIB_DEBUG
 - Fix bugs in creating a very large gzip header
 - Add uncompress2() function, which returns the input size used
 - Assure that deflateParams() will not switch functions mid-block
 - Dramatically speed up deflation for level 0 (storing)
 - Add gzfread(), duplicating the interface of fread()
 - Add gzfwrite(), duplicating the interface of fwrite()
 - Add deflateGetDictionary() function
 - Use snprintf() for later versions of Microsoft C
 - Fix *Init macros to use z_ prefix when requested
 - Replace as400 with os400 for OS/400 support [Monnerat]
 - Add crc32_z() and adler32_z() functions with size_t lengths
 - Update Visual Studio project files [AraHaan]
 Changes in 1.2.8 (28 Apr 2013)
 - Update contrib/minizip/iowin32.c for Windows RT [Vollant]
 - Do not force Z_CONST for C++
- Clean up contrib/vstudio [Ro§]
+- Clean up contrib/vstudio [Roß]
 - Correct spelling error in zlib.h
 - Fix mixed line endings in contrib/vstudio
@ -34,7 +77,7 @@ Changes in 1.2.7.1 (24 Mar 2013)
 - Clean up the usage of z_const and respect const usage within zlib
 - Clean up examples/gzlog.[ch] comparisons of different types
 - Avoid shift equal to bits in type (caused endless loop)
- Fix unintialized value bug in gzputc() introduced by const patches
+- Fix uninitialized value bug in gzputc() introduced by const patches
 - Fix memory allocation error in examples/zran.c [Nor]
 - Fix bug where gzopen(), gzclose() would write an empty file
 - Fix bug in gzclose() when gzwrite() runs out of memory
@ -194,7 +237,7 @@ Changes in 1.2.5.2 (17 Dec 2011)
 - Add a transparent write mode to gzopen() when 'T' is in the mode
 - Update python link in zlib man page
 - Get inffixed.h and MAKEFIXED result to match
- Add a ./config --solo option to make zlib subset with no libary use
+- Add a ./config --solo option to make zlib subset with no library use
 - Add undocumented inflateResetKeep() function for CAB file decoding
 - Add --cover option to ./configure for gcc coverage testing
 - Add #define ZLIB_CONST option to use const in the z_stream interface
@ -564,7 +607,7 @@ Changes in 1.2.3.1 (16 August 2006)
 - Update make_vms.com [Zinser]
 - Use -fPIC for shared build in configure [Teredesai, Nicholson]
 - Use only major version number for libz.so on IRIX and OSF1 [Reinholdtsen]
- Use fdopen() (not _fdopen()) for Interix in zutil.h [BŠck]
+- Use fdopen() (not _fdopen()) for Interix in zutil.h [Bäck]
 - Add some FAQ entries about the contrib directory
 - Update the MVS question in the FAQ
 - Avoid extraneous reads after EOF in gzio.c [Brown]
@ -1178,7 +1221,7 @@ Changes in 1.0.6 (19 Jan 1998)
        386 asm code replacing longest_match().
   contrib/iostream/ by Kevin Ruland <kevin@rodin.wustl.edu>
        A C++ I/O streams interface to the zlib gz* functions
-   contrib/iostream2/  by Tyge Løvset <Tyge.Lovset@cmr.no>
+   contrib/iostream2/  by Tyge Løvset <Tyge.Lovset@cmr.no>
        Another C++ I/O streams interface
   contrib/untgz/  by "Pedro A. Aranda Guti\irrez" <paag@tid.es>
        A very simple tar.gz file extractor using zlib
@ -1267,7 +1310,7 @@ Changes in 1.0.1 (20 May 96) [1.0 skipped to avoid confusion]
 - fix array overlay in deflate.c which sometimes caused bad compressed data
 - fix inflate bug with empty stored block
 - fix MSDOS medium model which was broken in 0.99
- fix deflateParams() which could generated bad compressed data.
+- fix deflateParams() which could generate bad compressed data.
 - Bytef is define'd instead of typedef'ed (work around Borland bug)
 - added an INDEX file
 - new makefiles for DJGPP (Makefile.dj2), 32-bit Borland (Makefile.b32),
--- a/zlib/README
+++ b/zlib/README
@ -1,6 +1,6 @@
 ZLIB DATA COMPRESSION LIBRARY
-zlib 1.2.8 is a general purpose data compression library.  All the code is
+zlib 1.2.11 is a general purpose data compression library.  All the code is
 thread safe.  The data format used by the zlib library is described by RFCs
 (Request for Comments) 1950 to 1952 in the files
 http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
@ -31,7 +31,7 @@ Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan.  1997
 issue of Dr.  Dobb's Journal; a copy of the article is available at
 http://marknelson.us/1997/01/01/zlib-engine/ .
-The changes made in version 1.2.8 are documented in the file ChangeLog.
+The changes made in version 1.2.11 are documented in the file ChangeLog.
 Unsupported third party contributions are provided in directory contrib/ .
@ -84,7 +84,7 @@ Acknowledgments:
 Copyright notice:
- (C) 1995-2013 Jean-loup Gailly and Mark Adler
+ (C) 1995-2017 Jean-loup Gailly and Mark Adler
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
--- a/zlib/adler32.c
+++ b/zlib/adler32.c
@ -1,5 +1,5 @@
 /* adler32.c -- compute the Adler-32 checksum of a data stream
- * Copyright (C) 1995-2011 Mark Adler
+ * Copyright (C) 1995-2011, 2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -7,11 +7,9 @@
 #include "zutil.h"
 #define local static
 local uLong adler32_combine_ OF((uLong adler1, uLong adler2, z_off64_t len2));
-#define BASE 65521      /* largest prime smaller than 65536 */
+#define BASE 65521U     /* largest prime smaller than 65536 */
 #define NMAX 5552
 /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
@ -62,10 +60,10 @@ local uLong adler32_combine_ OF((uLong adler1, uLong adler2, z_off64_t len2));
 #endif
 /* ========================================================================= */
-uLong ZEXPORT adler32(adler, buf, len)
+uLong ZEXPORT adler32_z(adler, buf, len)
    uLong adler;
    const Bytef *buf;
-    uInt len;
+    z_size_t len;
 {
    unsigned long sum2;
    unsigned n;
@ -132,6 +130,15 @@ uLong ZEXPORT adler32(adler, buf, len)
    return adler | (sum2 << 16);
 }
 /* ========================================================================= */
 uLong ZEXPORT adler32(adler, buf, len)
    uLong adler;
    const Bytef *buf;
    uInt len;
 {
    return adler32_z(adler, buf, len);
 }
 /* ========================================================================= */
 local uLong adler32_combine_(adler1, adler2, len2)
    uLong adler1;
@ -156,7 +163,7 @@ local uLong adler32_combine_(adler1, adler2, len2)
    sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;
    if (sum1 >= BASE) sum1 -= BASE;
    if (sum1 >= BASE) sum1 -= BASE;
-    if (sum2 >= (BASE << 1)) sum2 -= (BASE << 1);
+    if (sum2 >= ((unsigned long)BASE << 1)) sum2 -= ((unsigned long)BASE << 1);
    if (sum2 >= BASE) sum2 -= BASE;
    return sum1 | (sum2 << 16);
 }
--- a/zlib/compress.c
+++ b/zlib/compress.c
@ -1,5 +1,5 @@
 /* compress.c -- compress a memory buffer
- * Copyright (C) 1995-2005 Jean-loup Gailly.
+ * Copyright (C) 1995-2005, 2014, 2016 Jean-loup Gailly, Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -28,16 +28,11 @@ int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
 {
    z_stream stream;
    int err;
    const uInt max = (uInt)-1;
    uLong left;
-    stream.next_in = (z_const Bytef *)source;
+    left = *destLen;
-    stream.avail_in = (uInt)sourceLen;
+    *destLen = 0;
 #ifdef MAXSEG_64K
    /* Check for source > 64K on 16-bit machine: */
    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
 #endif
    stream.next_out = dest;
    stream.avail_out = (uInt)*destLen;
    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;
@ -46,15 +41,26 @@ int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
    err = deflateInit(&stream, level);
    if (err != Z_OK) return err;
-    err = deflate(&stream, Z_FINISH);
+    stream.next_out = dest;
-    if (err != Z_STREAM_END) {
+    stream.avail_out = 0;
-        deflateEnd(&stream);
+    stream.next_in = (z_const Bytef *)source;
-        return err == Z_OK ? Z_BUF_ERROR : err;
+    stream.avail_in = 0;
    }
    *destLen = stream.total_out;
-    err = deflateEnd(&stream);
+    do {
-    return err;
+        if (stream.avail_out == 0) {
            stream.avail_out = left > (uLong)max ? max : (uInt)left;
            left -= stream.avail_out;
        }
        if (stream.avail_in == 0) {
            stream.avail_in = sourceLen > (uLong)max ? max : (uInt)sourceLen;
            sourceLen -= stream.avail_in;
        }
        err = deflate(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH);
    } while (err == Z_OK);
    *destLen = stream.total_out;
    deflateEnd(&stream);
    return err == Z_STREAM_END ? Z_OK : err;
 }
 /* ===========================================================================
--- a/zlib/crc32.c
+++ b/zlib/crc32.c
@ -1,5 +1,5 @@
 /* crc32.c -- compute the CRC-32 of a data stream
- * Copyright (C) 1995-2006, 2010, 2011, 2012 Mark Adler
+ * Copyright (C) 1995-2006, 2010, 2011, 2012, 2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 *
 * Thanks to Rodney Brown <rbrown64@csc.com.au> for his contribution of faster
@ -30,17 +30,15 @@
 #include "zutil.h"      /* for STDC and FAR definitions */
 #define local static
 /* Definitions for doing the crc four data bytes at a time. */
 #if !defined(NOBYFOUR) && defined(Z_U4)
 #  define BYFOUR
 #endif
 #ifdef BYFOUR
   local unsigned long crc32_little OF((unsigned long,
-                        const unsigned char FAR *, unsigned));
+                        const unsigned char FAR *, z_size_t));
   local unsigned long crc32_big OF((unsigned long,
-                        const unsigned char FAR *, unsigned));
+                        const unsigned char FAR *, z_size_t));
 #  define TBLS 8
 #else
 #  define TBLS 1
@ -201,10 +199,10 @@ const z_crc_t FAR * ZEXPORT get_crc_table()
 #define DO8 DO1; DO1; DO1; DO1; DO1; DO1; DO1; DO1
 /* ========================================================================= */
-unsigned long ZEXPORT crc32(crc, buf, len)
+unsigned long ZEXPORT crc32_z(crc, buf, len)
    unsigned long crc;
    const unsigned char FAR *buf;
-    uInt len;
+    z_size_t len;
 {
    if (buf == Z_NULL) return 0UL;
@ -235,8 +233,29 @@ unsigned long ZEXPORT crc32(crc, buf, len)
    return crc ^ 0xffffffffUL;
 }
 /* ========================================================================= */
 unsigned long ZEXPORT crc32(crc, buf, len)
    unsigned long crc;
    const unsigned char FAR *buf;
    uInt len;
 {
    return crc32_z(crc, buf, len);
 }
 #ifdef BYFOUR
 /*
   This BYFOUR code accesses the passed unsigned char * buffer with a 32-bit
   integer pointer type. This violates the strict aliasing rule, where a
   compiler can assume, for optimization purposes, that two pointers to
   fundamentally different types won't ever point to the same memory. This can
   manifest as a problem only if one of the pointers is written to. This code
   only reads from those pointers. So long as this code remains isolated in
   this compilation unit, there won't be a problem. For this reason, this code
   should not be copied and pasted into a compilation unit in which other code
   writes to the buffer that is passed to these routines.
 */
 /* ========================================================================= */
 #define DOLIT4 c ^= *buf4++; \
        c = crc_table[3][c & 0xff] ^ crc_table[2][(c >> 8) & 0xff] ^ \
@ -247,7 +266,7 @@ unsigned long ZEXPORT crc32(crc, buf, len)
 local unsigned long crc32_little(crc, buf, len)
    unsigned long crc;
    const unsigned char FAR *buf;
-    unsigned len;
+    z_size_t len;
 {
    register z_crc_t c;
    register const z_crc_t FAR *buf4;
@ -278,7 +297,7 @@ local unsigned long crc32_little(crc, buf, len)
 }
 /* ========================================================================= */
-#define DOBIG4 c ^= *++buf4; \
+#define DOBIG4 c ^= *buf4++; \
        c = crc_table[4][c & 0xff] ^ crc_table[5][(c >> 8) & 0xff] ^ \
            crc_table[6][(c >> 16) & 0xff] ^ crc_table[7][c >> 24]
 #define DOBIG32 DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4
@ -287,7 +306,7 @@ local unsigned long crc32_little(crc, buf, len)
 local unsigned long crc32_big(crc, buf, len)
    unsigned long crc;
    const unsigned char FAR *buf;
-    unsigned len;
+    z_size_t len;
 {
    register z_crc_t c;
    register const z_crc_t FAR *buf4;
@ -300,7 +319,6 @@ local unsigned long crc32_big(crc, buf, len)
    }
    buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
    buf4--;
    while (len >= 32) {
        DOBIG32;
        len -= 32;
@ -309,7 +327,6 @@ local unsigned long crc32_big(crc, buf, len)
        DOBIG4;
        len -= 4;
    }
    buf4++;
    buf = (const unsigned char FAR *)buf4;
    if (len) do {
--- a/zlib/deflate.c
+++ b/zlib/deflate.c
--- a/zlib/deflate.h
+++ b/zlib/deflate.h
@ -1,5 +1,5 @@
 /* deflate.h -- internal compression state
- * Copyright (C) 1995-2012 Jean-loup Gailly
+ * Copyright (C) 1995-2016 Jean-loup Gailly
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -51,13 +51,16 @@
 #define Buf_size 16
 /* size of bit buffer in bi_buf */
-#define INIT_STATE    42
+#define INIT_STATE    42    /* zlib header -> BUSY_STATE */
-#define EXTRA_STATE   69
+#ifdef GZIP
-#define NAME_STATE    73
+#  define GZIP_STATE  57    /* gzip header -> BUSY_STATE | EXTRA_STATE */
-#define COMMENT_STATE 91
+#endif
-#define HCRC_STATE   103
+#define EXTRA_STATE   69    /* gzip extra block -> NAME_STATE */
-#define BUSY_STATE   113
+#define NAME_STATE    73    /* gzip file name -> COMMENT_STATE */
-#define FINISH_STATE 666
+#define COMMENT_STATE 91    /* gzip comment -> HCRC_STATE */
 #define HCRC_STATE   103    /* gzip header CRC -> BUSY_STATE */
 #define BUSY_STATE   113    /* deflate -> FINISH_STATE */
 #define FINISH_STATE 666    /* stream complete */
 /* Stream status */
@ -83,7 +86,7 @@ typedef struct static_tree_desc_s  static_tree_desc;
 typedef struct tree_desc_s {
    ct_data *dyn_tree;           /* the dynamic tree */
    int     max_code;            /* largest code with non zero frequency */
-    static_tree_desc *stat_desc; /* the corresponding static tree */
+    const static_tree_desc *stat_desc;  /* the corresponding static tree */
 } FAR tree_desc;
 typedef ush Pos;
@ -100,10 +103,10 @@ typedef struct internal_state {
    Bytef *pending_buf;  /* output still pending */
    ulg   pending_buf_size; /* size of pending_buf */
    Bytef *pending_out;  /* next pending byte to output to the stream */
-    uInt   pending;      /* nb of bytes in the pending buffer */
+    ulg   pending;       /* nb of bytes in the pending buffer */
    int   wrap;          /* bit 0 true for zlib, bit 1 true for gzip */
    gz_headerp  gzhead;  /* gzip header information to write */
-    uInt   gzindex;      /* where in extra, name, or comment */
+    ulg   gzindex;       /* where in extra, name, or comment */
    Byte  method;        /* can only be DEFLATED */
    int   last_flush;    /* value of flush param for previous deflate call */
@ -249,7 +252,7 @@ typedef struct internal_state {
    uInt matches;       /* number of string matches in current block */
    uInt insert;        /* bytes at end of window left to insert */
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
    ulg compressed_len; /* total bit length of compressed file mod 2^32 */
    ulg bits_sent;      /* bit length of compressed data sent mod 2^32 */
 #endif
@ -275,7 +278,7 @@ typedef struct internal_state {
 /* Output a byte on the stream.
 * IN assertion: there is enough room in pending_buf.
 */
-#define put_byte(s, c) {s->pending_buf[s->pending++] = (c);}
+#define put_byte(s, c) {s->pending_buf[s->pending++] = (Bytef)(c);}
 #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
@ -309,7 +312,7 @@ void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
 * used.
 */
-#ifndef DEBUG
+#ifndef ZLIB_DEBUG
 /* Inline versions of _tr_tally for speed: */
 #if defined(GEN_TREES_H) || !defined(STDC)
@ -328,8 +331,8 @@ void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
    flush = (s->last_lit == s->lit_bufsize-1); \
   }
 # define _tr_tally_dist(s, distance, length, flush) \
-  { uch len = (length); \
+  { uch len = (uch)(length); \
-    ush dist = (distance); \
+    ush dist = (ush)(distance); \
    s->d_buf[s->last_lit] = dist; \
    s->l_buf[s->last_lit++] = len; \
    dist--; \
--- a/zlib/gzguts.h
+++ b/zlib/gzguts.h
@ -1,5 +1,5 @@
 /* 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
 */
@ -25,6 +25,10 @@
 #  include <stdlib.h>
 #  include <limits.h>
 #endif
 #ifndef _POSIX_SOURCE
 #  define _POSIX_SOURCE
 #endif
 #include <fcntl.h>
 #ifdef _WIN32
@ -35,6 +39,10 @@
 #  include <io.h>
 #endif
 #if defined(_WIN32) || defined(__CYGWIN__)
 #  define WIDECHAR
 #endif
 #ifdef WINAPI_FAMILY
 #  define open _open
 #  define read _read
@ -95,18 +103,19 @@
 #  endif
 #endif
-/* unlike snprintf (which is required in C99, yet still not supported by
+/* unlike snprintf (which is required in C99), _snprintf does not guarantee
-   Microsoft more than a decade later!), _snprintf does not guarantee null
+   null termination of the result -- however this is only used in gzlib.c where
   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
@ -170,7 +179,7 @@ typedef struct {
    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 */
--- a/zlib/gzlib.c
+++ b/zlib/gzlib.c
@ -1,11 +1,11 @@
 /* gzlib.c -- zlib functions common to reading and writing gzip files
- * Copyright (C) 2004, 2010, 2011, 2012, 2013 Mark Adler
+ * Copyright (C) 2004-2017 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
 #include "gzguts.h"
-#if defined(_WIN32) && !defined(__BORLANDC__)
+#if defined(_WIN32) && !defined(__BORLANDC__) && !defined(__MINGW32__)
 #  define LSEEK _lseeki64
 #else
 #if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
@ -94,7 +94,7 @@ local gzFile gz_open(path, fd, mode)
    const char *mode;
 {
    gz_statep state;
-    size_t len;
+    z_size_t len;
    int oflag;
 #ifdef O_CLOEXEC
    int cloexec = 0;
@ -188,10 +188,10 @@ local gzFile gz_open(path, fd, mode)
    }
    /* save the path name for error messages */
-#ifdef _WIN32
+#ifdef WIDECHAR
    if (fd == -2) {
        len = wcstombs(NULL, path, 0);
-        if (len == (size_t)-1)
+        if (len == (z_size_t)-1)
            len = 0;
    }
    else
@ -202,7 +202,7 @@ local gzFile gz_open(path, fd, mode)
        free(state);
        return NULL;
    }
-#ifdef _WIN32
+#ifdef WIDECHAR
    if (fd == -2)
        if (len)
            wcstombs(state->path, path, len + 1);
@ -211,7 +211,7 @@ local gzFile gz_open(path, fd, mode)
    else
 #endif
 #if !defined(NO_snprintf) && !defined(NO_vsnprintf)
-        snprintf(state->path, len + 1, "%s", (const char *)path);
+        (void)snprintf(state->path, len + 1, "%s", (const char *)path);
 #else
        strcpy(state->path, path);
 #endif
@ -239,7 +239,7 @@ local gzFile gz_open(path, fd, mode)
    /* open the file with the appropriate flags (or just use fd) */
    state->fd = fd > -1 ? fd : (
-#ifdef _WIN32
+#ifdef WIDECHAR
        fd == -2 ? _wopen(path, oflag, 0666) :
 #endif
        open((const char *)path, oflag, 0666));
@ -248,8 +248,10 @@ local gzFile gz_open(path, fd, mode)
        free(state);
        return NULL;
    }
-    if (state->mode == GZ_APPEND)
+    if (state->mode == GZ_APPEND) {
        LSEEK(state->fd, 0, SEEK_END);  /* so gzoffset() is correct */
        state->mode = GZ_WRITE;         /* simplify later checks */
    }
    /* save the current position for rewinding (only if reading) */
    if (state->mode == GZ_READ) {
@ -291,7 +293,7 @@ gzFile ZEXPORT gzdopen(fd, mode)
    if (fd == -1 || (path = (char *)malloc(7 + 3 * sizeof(int))) == NULL)
        return NULL;
 #if !defined(NO_snprintf) && !defined(NO_vsnprintf)
-    snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd); /* for debugging */
+    (void)snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd);
 #else
    sprintf(path, "<fd:%d>", fd);   /* for debugging */
 #endif
@ -301,7 +303,7 @@ gzFile ZEXPORT gzdopen(fd, mode)
 }
 /* -- see zlib.h -- */
-#ifdef _WIN32
+#ifdef WIDECHAR
 gzFile ZEXPORT gzopen_w(path, mode)
    const wchar_t *path;
    const char *mode;
@ -329,6 +331,8 @@ int ZEXPORT gzbuffer(file, size)
        return -1;
    /* check and set requested size */
    if ((size << 1) < size)
        return -1;              /* need to be able to double it */
    if (size < 2)
        size = 2;               /* need two bytes to check magic header */
    state->want = size;
@ -604,14 +608,13 @@ void ZLIB_INTERNAL gz_error(state, err, msg)
        return;
    }
 #if !defined(NO_snprintf) && !defined(NO_vsnprintf)
-    snprintf(state->msg, strlen(state->path) + strlen(msg) + 3,
+    (void)snprintf(state->msg, strlen(state->path) + strlen(msg) + 3,
                   "%s%s%s", state->path, ": ", msg);
 #else
    strcpy(state->msg, state->path);
    strcat(state->msg, ": ");
    strcat(state->msg, msg);
 #endif
    return;
 }
 #ifndef INT_MAX
--- a/zlib/gzread.c
+++ b/zlib/gzread.c
@ -1,5 +1,5 @@
 /* gzread.c -- zlib functions for reading gzip files
- * 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
 */
@ -12,6 +12,7 @@ local int gz_look OF((gz_statep));
 local int gz_decomp OF((gz_statep));
 local int gz_fetch OF((gz_statep));
 local int gz_skip OF((gz_statep, z_off64_t));
 local z_size_t gz_read OF((gz_statep, voidp, z_size_t));
 /* Use read() to load a buffer -- return -1 on error, otherwise 0.  Read from
   state->fd, and update state->eof, state->err, and state->msg as appropriate.
@ -24,13 +25,17 @@ local int gz_load(state, buf, len, have)
    unsigned *have;
 {
    int ret;
    unsigned get, max = ((unsigned)-1 >> 2) + 1;
    *have = 0;
    do {
-        ret = read(state->fd, buf + *have, len - *have);
+        get = len - *have;
        if (get > max)
            get = max;
        ret = read(state->fd, buf + *have, get);
        if (ret <= 0)
            break;
-        *have += ret;
+        *have += (unsigned)ret;
    } while (*have < len);
    if (ret < 0) {
        gz_error(state, Z_ERRNO, zstrerror());
@ -94,9 +99,7 @@ local int gz_look(state)
        state->in = (unsigned char *)malloc(state->want);
        state->out = (unsigned char *)malloc(state->want << 1);
        if (state->in == NULL || state->out == NULL) {
            if (state->out != NULL)
            free(state->out);
            if (state->in != NULL)
            free(state->in);
            gz_error(state, Z_MEM_ERROR, "out of memory");
            return -1;
@ -284,33 +287,17 @@ local int gz_skip(state, len)
    return 0;
 }
-/* -- see zlib.h -- */
+/* Read len bytes into buf from file, or less than len up to the end of the
-int ZEXPORT gzread(file, buf, len)
+   input.  Return the number of bytes read.  If zero is returned, either the
-    gzFile file;
+   end of file was reached, or there was an error.  state->err must be
-    voidp buf;
+   consulted in that case to determine which. */
-    unsigned len;
+local z_size_t gz_read(state, buf, len)
 {
    unsigned got, n;
    gz_statep state;
-    z_streamp strm;
+    voidp buf;
-
+    z_size_t len;
-    /* get internal structure */
+{
-    if (file == NULL)
+    z_size_t got;
-        return -1;
+    unsigned n;
    state = (gz_statep)file;
    strm = &(state->strm);
    /* check that we're reading and that there's no (serious) error */
    if (state->mode != GZ_READ ||
            (state->err != Z_OK && state->err != Z_BUF_ERROR))
        return -1;
    /* since an int is returned, make sure len fits in one, otherwise return
       with an error (this avoids the flaw in the interface) */
    if ((int)len < 0) {
        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
        return -1;
    }
    /* if len is zero, avoid unnecessary operations */
    if (len == 0)
@ -320,32 +307,38 @@ int ZEXPORT gzread(file, buf, len)
    if (state->seek) {
        state->seek = 0;
        if (gz_skip(state, state->skip) == -1)
-            return -1;
+            return 0;
    }
    /* get len bytes to buf, or less than len if at the end */
    got = 0;
    do {
        /* set n to the maximum amount of len that fits in an unsigned int */
        n = -1;
        if (n > len)
            n = len;
        /* first just try copying data from the output buffer */
        if (state->x.have) {
-            n = state->x.have > len ? len : state->x.have;
+            if (state->x.have < n)
                n = state->x.have;
            memcpy(buf, state->x.next, n);
            state->x.next += n;
            state->x.have -= n;
        }
        /* output buffer empty -- return if we're at the end of the input */
-        else if (state->eof && strm->avail_in == 0) {
+        else if (state->eof && state->strm.avail_in == 0) {
            state->past = 1;        /* tried to read past end */
            break;
        }
        /* need output data -- for small len or new stream load up our output
           buffer */
-        else if (state->how == LOOK || len < (state->size << 1)) {
+        else if (state->how == LOOK || n < (state->size << 1)) {
            /* get more output, looking for header if required */
            if (gz_fetch(state) == -1)
-                return -1;
+                return 0;
            continue;       /* no progress yet -- go back to copy above */
            /* the copy above assures that we will leave with space in the
               output buffer, allowing at least one gzungetc() to succeed */
@ -353,16 +346,16 @@ int ZEXPORT gzread(file, buf, len)
        /* large len -- read directly into user buffer */
        else if (state->how == COPY) {      /* read directly */
-            if (gz_load(state, (unsigned char *)buf, len, &n) == -1)
+            if (gz_load(state, (unsigned char *)buf, n, &n) == -1)
-                return -1;
+                return 0;
        }
        /* large len -- decompress directly into user buffer */
        else {  /* state->how == GZIP */
-            strm->avail_out = len;
+            state->strm.avail_out = n;
-            strm->next_out = (unsigned char *)buf;
+            state->strm.next_out = (unsigned char *)buf;
            if (gz_decomp(state) == -1)
-                return -1;
+                return 0;
            n = state->x.have;
            state->x.have = 0;
        }
@ -374,8 +367,75 @@ int ZEXPORT gzread(file, buf, len)
        state->x.pos += n;
    } while (len);
-    /* return number of bytes read into user buffer (will fit in int) */
+    /* return number of bytes read into user buffer */
-    return (int)got;
+    return got;
 }
 /* -- see zlib.h -- */
 int ZEXPORT gzread(file, buf, len)
    gzFile file;
    voidp buf;
    unsigned len;
 {
    gz_statep state;
    /* get internal structure */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    /* check that we're reading and that there's no (serious) error */
    if (state->mode != GZ_READ ||
            (state->err != Z_OK && state->err != Z_BUF_ERROR))
        return -1;
    /* since an int is returned, make sure len fits in one, otherwise return
       with an error (this avoids a flaw in the interface) */
    if ((int)len < 0) {
        gz_error(state, Z_STREAM_ERROR, "request does not fit in an int");
        return -1;
    }
    /* read len or fewer bytes to buf */
    len = gz_read(state, buf, len);
    /* check for an error */
    if (len == 0 && state->err != Z_OK && state->err != Z_BUF_ERROR)
        return -1;
    /* return the number of bytes read (this is assured to fit in an int) */
    return (int)len;
 }
 /* -- see zlib.h -- */
 z_size_t ZEXPORT gzfread(buf, size, nitems, file)
    voidp buf;
    z_size_t size;
    z_size_t nitems;
    gzFile file;
 {
    z_size_t len;
    gz_statep state;
    /* get internal structure */
    if (file == NULL)
        return 0;
    state = (gz_statep)file;
    /* check that we're reading and that there's no (serious) error */
    if (state->mode != GZ_READ ||
            (state->err != Z_OK && state->err != Z_BUF_ERROR))
        return 0;
    /* compute bytes to read -- error on overflow */
    len = nitems * size;
    if (size && len / size != nitems) {
        gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
        return 0;
    }
    /* read len or fewer bytes to buf, return the number of full items read */
    return len ? gz_read(state, buf, len) / size : 0;
 }
 /* -- see zlib.h -- */
@ -408,8 +468,8 @@ int ZEXPORT gzgetc(file)
        return *(state->x.next)++;
    }
-    /* nothing there -- try gzread() */
+    /* nothing there -- try gz_read() */
-    ret = gzread(file, buf, 1);
+    ret = gz_read(state, buf, 1);
    return ret < 1 ? -1 : buf[0];
 }
@ -451,7 +511,7 @@ int ZEXPORT gzungetc(c, file)
    if (state->x.have == 0) {
        state->x.have = 1;
        state->x.next = state->out + (state->size << 1) - 1;
-        state->x.next[0] = c;
+        state->x.next[0] = (unsigned char)c;
        state->x.pos--;
        state->past = 0;
        return c;
@ -473,7 +533,7 @@ int ZEXPORT gzungetc(c, file)
    }
    state->x.have++;
    state->x.next--;
-    state->x.next[0] = c;
+    state->x.next[0] = (unsigned char)c;
    state->x.pos--;
    state->past = 0;
    return c;
--- a/zlib/gzwrite.c
+++ b/zlib/gzwrite.c
@ -1,5 +1,5 @@
 /* gzwrite.c -- zlib functions for writing gzip files
- * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
+ * Copyright (C) 2004-2017 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -9,17 +9,19 @@
 local int gz_init OF((gz_statep));
 local int gz_comp OF((gz_statep, int));
 local int gz_zero OF((gz_statep, z_off64_t));
 local z_size_t gz_write OF((gz_statep, voidpc, z_size_t));
 /* Initialize state for writing a gzip file.  Mark initialization by setting
-   state->size to non-zero.  Return -1 on failure or 0 on success. */
+   state->size to non-zero.  Return -1 on a memory allocation failure, or 0 on
   success. */
 local int gz_init(state)
    gz_statep state;
 {
    int ret;
    z_streamp strm = &(state->strm);
-    /* allocate input buffer */
+    /* allocate input buffer (double size for gzprintf) */
-    state->in = (unsigned char *)malloc(state->want);
+    state->in = (unsigned char *)malloc(state->want << 1);
    if (state->in == NULL) {
        gz_error(state, Z_MEM_ERROR, "out of memory");
        return -1;
@ -47,6 +49,7 @@ local int gz_init(state)
            gz_error(state, Z_MEM_ERROR, "out of memory");
            return -1;
        }
        strm->next_in = NULL;
    }
    /* mark state as initialized */
@ -62,17 +65,17 @@ local int gz_init(state)
 }
 /* Compress whatever is at avail_in and next_in and write to the output file.
-   Return -1 if there is an error writing to the output file, otherwise 0.
+   Return -1 if there is an error writing to the output file or if gz_init()
-   flush is assumed to be a valid deflate() flush value.  If flush is Z_FINISH,
+   fails to allocate memory, otherwise 0.  flush is assumed to be a valid
-   then the deflate() state is reset to start a new gzip stream.  If gz->direct
+   deflate() flush value.  If flush is Z_FINISH, then the deflate() state is
-   is true, then simply write to the output file without compressing, and
+   reset to start a new gzip stream.  If gz->direct is true, then simply write
-   ignore flush. */
+   to the output file without compressing, and ignore flush. */
 local int gz_comp(state, flush)
    gz_statep state;
    int flush;
 {
-    int ret, got;
+    int ret, writ;
-    unsigned have;
+    unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
    z_streamp strm = &(state->strm);
    /* allocate memory if this is the first time through */
@ -81,12 +84,16 @@ local int gz_comp(state, flush)
    /* write directly if requested */
    if (state->direct) {
-        got = write(state->fd, strm->next_in, strm->avail_in);
+        while (strm->avail_in) {
-        if (got < 0 || (unsigned)got != strm->avail_in) {
+            put = strm->avail_in > max ? max : strm->avail_in;
            writ = write(state->fd, strm->next_in, put);
            if (writ < 0) {
                gz_error(state, Z_ERRNO, zstrerror());
                return -1;
            }
-        strm->avail_in = 0;
+            strm->avail_in -= (unsigned)writ;
            strm->next_in += writ;
        }
        return 0;
    }
@ -97,17 +104,21 @@ local int gz_comp(state, flush)
           doing Z_FINISH then don't write until we get to Z_STREAM_END */
        if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
            (flush != Z_FINISH || ret == Z_STREAM_END))) {
-            have = (unsigned)(strm->next_out - state->x.next);
+            while (strm->next_out > state->x.next) {
-            if (have && ((got = write(state->fd, state->x.next, have)) < 0 ||
+                put = strm->next_out - state->x.next > (int)max ? max :
-                         (unsigned)got != have)) {
+                      (unsigned)(strm->next_out - state->x.next);
                writ = write(state->fd, state->x.next, put);
                if (writ < 0) {
                    gz_error(state, Z_ERRNO, zstrerror());
                    return -1;
                }
                state->x.next += writ;
            }
            if (strm->avail_out == 0) {
                strm->avail_out = state->size;
                strm->next_out = state->out;
                state->x.next = state->out;
            }
            state->x.next = strm->next_out;
        }
        /* compress */
@ -129,7 +140,8 @@ local int gz_comp(state, flush)
    return 0;
 }
-/* Compress len zeros to output.  Return -1 on error, 0 on success. */
+/* Compress len zeros to output.  Return -1 on a write error or memory
   allocation failure by gz_comp(), or 0 on success. */
 local int gz_zero(state, len)
    gz_statep state;
    z_off64_t len;
@ -161,32 +173,14 @@ local int gz_zero(state, len)
    return 0;
 }
-/* -- see zlib.h -- */
+/* Write len bytes from buf to file.  Return the number of bytes written.  If
-int ZEXPORT gzwrite(file, buf, len)
+   the returned value is less than len, then there was an error. */
-    gzFile file;
+local z_size_t gz_write(state, buf, len)
    voidpc buf;
    unsigned len;
 {
    unsigned put = len;
    gz_statep state;
-    z_streamp strm;
+    voidpc buf;
-
+    z_size_t len;
-    /* get internal structure */
+{
-    if (file == NULL)
+    z_size_t put = len;
        return 0;
    state = (gz_statep)file;
    strm = &(state->strm);
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return 0;
    /* since an int is returned, make sure len fits in one, otherwise return
       with an error (this avoids the flaw in the interface) */
    if ((int)len < 0) {
        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
        return 0;
    }
    /* if len is zero, avoid unnecessary operations */
    if (len == 0)
@ -209,14 +203,15 @@ int ZEXPORT gzwrite(file, buf, len)
        do {
            unsigned have, copy;
-            if (strm->avail_in == 0)
+            if (state->strm.avail_in == 0)
-                strm->next_in = state->in;
+                state->strm.next_in = state->in;
-            have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
+            have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
                              state->in);
            copy = state->size - have;
            if (copy > len)
                copy = len;
            memcpy(state->in + have, buf, copy);
-            strm->avail_in += copy;
+            state->strm.avail_in += copy;
            state->x.pos += copy;
            buf = (const char *)buf + copy;
            len -= copy;
@ -226,19 +221,83 @@ int ZEXPORT gzwrite(file, buf, len)
    }
    else {
        /* consume whatever's left in the input buffer */
-        if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
+        if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
            return 0;
        /* directly compress user buffer to file */
-        strm->avail_in = len;
+        state->strm.next_in = (z_const Bytef *)buf;
-        strm->next_in = (z_const Bytef *)buf;
+        do {
-        state->x.pos += len;
+            unsigned n = (unsigned)-1;
            if (n > len)
                n = len;
            state->strm.avail_in = n;
            state->x.pos += n;
            if (gz_comp(state, Z_NO_FLUSH) == -1)
                return 0;
            len -= n;
        } while (len);
    }
    /* input was all buffered or compressed */
    return put;
 }
 /* -- see zlib.h -- */
 int ZEXPORT gzwrite(file, buf, len)
    gzFile file;
    voidpc buf;
    unsigned len;
 {
    gz_statep state;
    /* get internal structure */
    if (file == NULL)
        return 0;
    state = (gz_statep)file;
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return 0;
    /* since an int is returned, make sure len fits in one, otherwise return
       with an error (this avoids a flaw in the interface) */
    if ((int)len < 0) {
        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
        return 0;
    }
-    /* input was all buffered or compressed (put will fit in int) */
+    /* write len bytes from buf (the return value will fit in an int) */
-    return (int)put;
+    return (int)gz_write(state, buf, len);
 }
 /* -- see zlib.h -- */
 z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
    voidpc buf;
    z_size_t size;
    z_size_t nitems;
    gzFile file;
 {
    z_size_t len;
    gz_statep state;
    /* get internal structure */
    if (file == NULL)
        return 0;
    state = (gz_statep)file;
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return 0;
    /* compute bytes to read -- error on overflow */
    len = nitems * size;
    if (size && len / size != nitems) {
        gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
        return 0;
    }
    /* write len bytes to buf, return the number of full items written */
    return len ? gz_write(state, buf, len) / size : 0;
 }
 /* -- see zlib.h -- */
@ -275,7 +334,7 @@ int ZEXPORT gzputc(file, c)
            strm->next_in = state->in;
        have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
        if (have < state->size) {
-            state->in[have] = c;
+            state->in[have] = (unsigned char)c;
            strm->avail_in++;
            state->x.pos++;
            return c & 0xff;
@ -283,8 +342,8 @@ int ZEXPORT gzputc(file, c)
    }
    /* no room in buffer or not initialized, use gz_write() */
-    buf[0] = c;
+    buf[0] = (unsigned char)c;
-    if (gzwrite(file, buf, 1) != 1)
+    if (gz_write(state, buf, 1) != 1)
        return -1;
    return c & 0xff;
 }
@ -295,11 +354,21 @@ int ZEXPORT gzputs(file, str)
    const char *str;
 {
    int ret;
-    unsigned len;
+    z_size_t len;
    gz_statep state;
    /* get internal structure */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return -1;
    /* write string */
-    len = (unsigned)strlen(str);
+    len = strlen(str);
-    ret = gzwrite(file, str, len);
+    ret = gz_write(state, str, len);
    return ret == 0 && len != 0 ? -1 : ret;
 }
@ -309,63 +378,73 @@ int ZEXPORT gzputs(file, str)
 /* -- see zlib.h -- */
 int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
 {
-    int size, len;
+    int len;
    unsigned left;
    char *next;
    gz_statep state;
    z_streamp strm;
    /* get internal structure */
    if (file == NULL)
-        return -1;
+        return Z_STREAM_ERROR;
    state = (gz_statep)file;
    strm = &(state->strm);
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return 0;
+        return Z_STREAM_ERROR;
    /* make sure we have some buffer space */
    if (state->size == 0 && gz_init(state) == -1)
-        return 0;
+        return state->err;
    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
-            return 0;
+            return state->err;
    }
-    /* consume whatever's left in the input buffer */
+    /* do the printf() into the input buffer, put length in len -- the input
-    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
+       buffer is double-sized just for this function, so there is guaranteed to
-        return 0;
+       be state->size bytes available after the current contents */
-
+    if (strm->avail_in == 0)
-    /* do the printf() into the input buffer, put length in len */
+        strm->next_in = state->in;
-    size = (int)(state->size);
+    next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
-    state->in[size - 1] = 0;
+    next[state->size - 1] = 0;
 #ifdef NO_vsnprintf
 #  ifdef HAS_vsprintf_void
-    (void)vsprintf((char *)(state->in), format, va);
+    (void)vsprintf(next, format, va);
-    for (len = 0; len < size; len++)
+    for (len = 0; len < state->size; len++)
-        if (state->in[len] == 0) break;
+        if (next[len] == 0) break;
 #  else
-    len = vsprintf((char *)(state->in), format, va);
+    len = vsprintf(next, format, va);
 #  endif
 #else
 #  ifdef HAS_vsnprintf_void
-    (void)vsnprintf((char *)(state->in), size, format, va);
+    (void)vsnprintf(next, state->size, format, va);
-    len = strlen((char *)(state->in));
+    len = strlen(next);
 #  else
-    len = vsnprintf((char *)(state->in), size, format, va);
+    len = vsnprintf(next, state->size, format, va);
 #  endif
 #endif
    /* check that printf() results fit in buffer */
-    if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
+    if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
        return 0;
-    /* update buffer and position, defer compression until needed */
+    /* update buffer and position, compress first half if past that */
-    strm->avail_in = (unsigned)len;
+    strm->avail_in += (unsigned)len;
    strm->next_in = state->in;
    state->x.pos += len;
    if (strm->avail_in >= state->size) {
        left = strm->avail_in - state->size;
        strm->avail_in = state->size;
        if (gz_comp(state, Z_NO_FLUSH) == -1)
            return state->err;
        memcpy(state->in, state->in + state->size, left);
        strm->next_in = state->in;
        strm->avail_in = left;
    }
    return len;
 }
@ -390,73 +469,82 @@ int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
    int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
        a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
 {
-    int size, len;
+    unsigned len, left;
    char *next;
    gz_statep state;
    z_streamp strm;
    /* get internal structure */
    if (file == NULL)
-        return -1;
+        return Z_STREAM_ERROR;
    state = (gz_statep)file;
    strm = &(state->strm);
    /* check that can really pass pointer in ints */
    if (sizeof(int) != sizeof(void *))
-        return 0;
+        return Z_STREAM_ERROR;
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return 0;
+        return Z_STREAM_ERROR;
    /* make sure we have some buffer space */
    if (state->size == 0 && gz_init(state) == -1)
-        return 0;
+        return state->error;
    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
-            return 0;
+            return state->error;
    }
-    /* consume whatever's left in the input buffer */
+    /* do the printf() into the input buffer, put length in len -- the input
-    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
+       buffer is double-sized just for this function, so there is guaranteed to
-        return 0;
+       be state->size bytes available after the current contents */
-
+    if (strm->avail_in == 0)
-    /* do the printf() into the input buffer, put length in len */
+        strm->next_in = state->in;
-    size = (int)(state->size);
+    next = (char *)(strm->next_in + strm->avail_in);
-    state->in[size - 1] = 0;
+    next[state->size - 1] = 0;
 #ifdef NO_snprintf
 #  ifdef HAS_sprintf_void
-    sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
+    sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
-            a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+            a13, a14, a15, a16, a17, a18, a19, a20);
    for (len = 0; len < size; len++)
-        if (state->in[len] == 0) break;
+        if (next[len] == 0)
            break;
 #  else
-    len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
+    len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
-                  a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+                  a12, a13, a14, a15, a16, a17, a18, a19, a20);
 #  endif
 #else
 #  ifdef HAS_snprintf_void
-    snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,
+    snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
-             a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+             a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
-    len = strlen((char *)(state->in));
+    len = strlen(next);
 #  else
-    len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,
+    len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
-                   a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18,
+                   a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
                   a19, a20);
 #  endif
 #endif
    /* check that printf() results fit in buffer */
-    if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
+    if (len == 0 || len >= state->size || next[state->size - 1] != 0)
        return 0;
-    /* update buffer and position, defer compression until needed */
+    /* update buffer and position, compress first half if past that */
-    strm->avail_in = (unsigned)len;
+    strm->avail_in += len;
    strm->next_in = state->in;
    state->x.pos += len;
-    return len;
+    if (strm->avail_in >= state->size) {
        left = strm->avail_in - state->size;
        strm->avail_in = state->size;
        if (gz_comp(state, Z_NO_FLUSH) == -1)
            return state->err;
        memcpy(state->in, state->in + state->size, left);
        strm->next_in = state->in;
        strm->avail_in = left;
    }
    return (int)len;
 }
 #endif
@ -470,7 +558,7 @@ int ZEXPORT gzflush(file, flush)
    /* get internal structure */
    if (file == NULL)
-        return -1;
+        return Z_STREAM_ERROR;
    state = (gz_statep)file;
    /* check that we're writing and that there's no error */
@ -485,11 +573,11 @@ int ZEXPORT gzflush(file, flush)
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
-            return -1;
+            return state->err;
    }
    /* compress remaining data with requested flush */
-    gz_comp(state, flush);
+    (void)gz_comp(state, flush);
    return state->err;
 }
@ -520,13 +608,13 @@ int ZEXPORT gzsetparams(file, level, strategy)
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
-            return -1;
+            return state->err;
    }
    /* change compression parameters for subsequent input */
    if (state->size) {
        /* flush previous input with previous parameters before changing */
-        if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1)
+        if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
            return state->err;
        deflateParams(strm, level, strategy);
    }
--- a/zlib/infback.c
+++ b/zlib/infback.c
@ -1,5 +1,5 @@
 /* infback.c -- inflate using a call-back interface
- * Copyright (C) 1995-2011 Mark Adler
+ * Copyright (C) 1995-2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -61,7 +61,7 @@ int stream_size;
    Tracev((stderr, "inflate: allocated\n"));
    strm->state = (struct internal_state FAR *)state;
    state->dmax = 32768U;
-    state->wbits = windowBits;
+    state->wbits = (uInt)windowBits;
    state->wsize = 1U << windowBits;
    state->window = window;
    state->wnext = 0;
--- a/zlib/inffast.c
+++ b/zlib/inffast.c
@ -1,5 +1,5 @@
 /* inffast.c -- fast decoding
- * Copyright (C) 1995-2008, 2010, 2013 Mark Adler
+ * Copyright (C) 1995-2017 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -8,26 +8,9 @@
 #include "inflate.h"
 #include "inffast.h"
-#ifndef ASMINF
+#ifdef ASMINF
-
+#  pragma message("Assembler code may have bugs -- use at your own risk")
 /* Allow machine dependent optimization for post-increment or pre-increment.
   Based on testing to date,
   Pre-increment preferred for:
   - PowerPC G3 (Adler)
   - MIPS R5000 (Randers-Pehrson)
   Post-increment preferred for:
   - none
   No measurable difference:
   - Pentium III (Anderson)
   - M68060 (Nikl)
 */
 #ifdef POSTINC
 #  define OFF 0
 #  define PUP(a) *(a)++
 #else
 #  define OFF 1
 #  define PUP(a) *++(a)
 #endif
 /*
   Decode literal, length, and distance codes and write out the resulting
@ -96,9 +79,9 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
    /* copy state to local variables */
    state = (struct inflate_state FAR *)strm->state;
-    in = strm->next_in - OFF;
+    in = strm->next_in;
    last = in + (strm->avail_in - 5);
-    out = strm->next_out - OFF;
+    out = strm->next_out;
    beg = out - (start - strm->avail_out);
    end = out + (strm->avail_out - 257);
 #ifdef INFLATE_STRICT
@ -119,9 +102,9 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
       input data or output space */
    do {
        if (bits < 15) {
-            hold += (unsigned long)(PUP(in)) << bits;
+            hold += (unsigned long)(*in++) << bits;
            bits += 8;
-            hold += (unsigned long)(PUP(in)) << bits;
+            hold += (unsigned long)(*in++) << bits;
            bits += 8;
        }
        here = lcode[hold & lmask];
@ -134,14 +117,14 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
            Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
                    "inflate:         literal '%c'\n" :
                    "inflate:         literal 0x%02x\n", here.val));
-            PUP(out) = (unsigned char)(here.val);
+            *out++ = (unsigned char)(here.val);
        }
        else if (op & 16) {                     /* length base */
            len = (unsigned)(here.val);
            op &= 15;                           /* number of extra bits */
            if (op) {
                if (bits < op) {
-                    hold += (unsigned long)(PUP(in)) << bits;
+                    hold += (unsigned long)(*in++) << bits;
                    bits += 8;
                }
                len += (unsigned)hold & ((1U << op) - 1);
@ -150,9 +133,9 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
            }
            Tracevv((stderr, "inflate:         length %u\n", len));
            if (bits < 15) {
-                hold += (unsigned long)(PUP(in)) << bits;
+                hold += (unsigned long)(*in++) << bits;
                bits += 8;
-                hold += (unsigned long)(PUP(in)) << bits;
+                hold += (unsigned long)(*in++) << bits;
                bits += 8;
            }
            here = dcode[hold & dmask];
@ -165,10 +148,10 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
                dist = (unsigned)(here.val);
                op &= 15;                       /* number of extra bits */
                if (bits < op) {
-                    hold += (unsigned long)(PUP(in)) << bits;
+                    hold += (unsigned long)(*in++) << bits;
                    bits += 8;
                    if (bits < op) {
-                        hold += (unsigned long)(PUP(in)) << bits;
+                        hold += (unsigned long)(*in++) << bits;
                        bits += 8;
                    }
                }
@ -196,30 +179,30 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
 #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
                        if (len <= op - whave) {
                            do {
-                                PUP(out) = 0;
+                                *out++ = 0;
                            } while (--len);
                            continue;
                        }
                        len -= op - whave;
                        do {
-                            PUP(out) = 0;
+                            *out++ = 0;
                        } while (--op > whave);
                        if (op == 0) {
                            from = out - dist;
                            do {
-                                PUP(out) = PUP(from);
+                                *out++ = *from++;
                            } while (--len);
                            continue;
                        }
 #endif
                    }
-                    from = window - OFF;
+                    from = window;
                    if (wnext == 0) {           /* very common case */
                        from += wsize - op;
                        if (op < len) {         /* some from window */
                            len -= op;
                            do {
-                                PUP(out) = PUP(from);
+                                *out++ = *from++;
                            } while (--op);
                            from = out - dist;  /* rest from output */
                        }
@ -230,14 +213,14 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
                        if (op < len) {         /* some from end of window */
                            len -= op;
                            do {
-                                PUP(out) = PUP(from);
+                                *out++ = *from++;
                            } while (--op);
-                            from = window - OFF;
+                            from = window;
                            if (wnext < len) {  /* some from start of window */
                                op = wnext;
                                len -= op;
                                do {
-                                    PUP(out) = PUP(from);
+                                    *out++ = *from++;
                                } while (--op);
                                from = out - dist;      /* rest from output */
                            }
@ -248,35 +231,35 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
                        if (op < len) {         /* some from window */
                            len -= op;
                            do {
-                                PUP(out) = PUP(from);
+                                *out++ = *from++;
                            } while (--op);
                            from = out - dist;  /* rest from output */
                        }
                    }
                    while (len > 2) {
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
                        len -= 3;
                    }
                    if (len) {
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
                        if (len > 1)
-                            PUP(out) = PUP(from);
+                            *out++ = *from++;
                    }
                }
                else {
                    from = out - dist;          /* copy direct from output */
                    do {                        /* minimum length is three */
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
                        len -= 3;
                    } while (len > 2);
                    if (len) {
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
                        if (len > 1)
-                            PUP(out) = PUP(from);
+                            *out++ = *from++;
                    }
                }
            }
@ -313,8 +296,8 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
    hold &= (1U << bits) - 1;
    /* update state and return */
-    strm->next_in = in + OFF;
+    strm->next_in = in;
-    strm->next_out = out + OFF;
+    strm->next_out = out;
    strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last));
    strm->avail_out = (unsigned)(out < end ?
                                 257 + (end - out) : 257 - (out - end));
--- a/zlib/inflate.c
+++ b/zlib/inflate.c
@ -1,5 +1,5 @@
 /* inflate.c -- zlib decompression
- * Copyright (C) 1995-2012 Mark Adler
+ * Copyright (C) 1995-2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -92,6 +92,7 @@
 #endif
 /* function prototypes */
 local int inflateStateCheck OF((z_streamp strm));
 local void fixedtables OF((struct inflate_state FAR *state));
 local int updatewindow OF((z_streamp strm, const unsigned char FAR *end,
                           unsigned copy));
@ -101,12 +102,26 @@ local int updatewindow OF((z_streamp strm, const unsigned char FAR *end,
 local unsigned syncsearch OF((unsigned FAR *have, const unsigned char FAR *buf,
                              unsigned len));
 local int inflateStateCheck(strm)
 z_streamp strm;
 {
    struct inflate_state FAR *state;
    if (strm == Z_NULL ||
        strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0)
        return 1;
    state = (struct inflate_state FAR *)strm->state;
    if (state == Z_NULL || state->strm != strm ||
        state->mode < HEAD || state->mode > SYNC)
        return 1;
    return 0;
 }
 int ZEXPORT inflateResetKeep(strm)
 z_streamp strm;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    strm->total_in = strm->total_out = state->total = 0;
    strm->msg = Z_NULL;
@ -131,7 +146,7 @@ z_streamp strm;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    state->wsize = 0;
    state->whave = 0;
@ -147,7 +162,7 @@ int windowBits;
    struct inflate_state FAR *state;
    /* get the state */
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    /* extract wrap request from windowBits parameter */
@ -156,7 +171,7 @@ int windowBits;
        windowBits = -windowBits;
    }
    else {
-        wrap = (windowBits >> 4) + 1;
+        wrap = (windowBits >> 4) + 5;
 #ifdef GUNZIP
        if (windowBits < 48)
            windowBits &= 15;
@ -210,7 +225,9 @@ int stream_size;
    if (state == Z_NULL) return Z_MEM_ERROR;
    Tracev((stderr, "inflate: allocated\n"));
    strm->state = (struct internal_state FAR *)state;
    state->strm = strm;
    state->window = Z_NULL;
    state->mode = HEAD;     /* to pass state test in inflateReset2() */
    ret = inflateReset2(strm, windowBits);
    if (ret != Z_OK) {
        ZFREE(strm, state);
@ -234,17 +251,17 @@ int value;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if (bits < 0) {
        state->hold = 0;
        state->bits = 0;
        return Z_OK;
    }
-    if (bits > 16 || state->bits + bits > 32) return Z_STREAM_ERROR;
+    if (bits > 16 || state->bits + (uInt)bits > 32) return Z_STREAM_ERROR;
    value &= (1L << bits) - 1;
-    state->hold += value << state->bits;
+    state->hold += (unsigned)value << state->bits;
-    state->bits += bits;
+    state->bits += (uInt)bits;
    return Z_OK;
 }
@ -625,7 +642,7 @@ int flush;
    static const unsigned short order[19] = /* permutation of code lengths */
        {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
-    if (strm == Z_NULL || strm->state == Z_NULL || strm->next_out == Z_NULL ||
+    if (inflateStateCheck(strm) || strm->next_out == Z_NULL ||
        (strm->next_in == Z_NULL && strm->avail_in != 0))
        return Z_STREAM_ERROR;
@ -645,6 +662,8 @@ int flush;
            NEEDBITS(16);
 #ifdef GUNZIP
            if ((state->wrap & 2) && hold == 0x8b1f) {  /* gzip header */
                if (state->wbits == 0)
                    state->wbits = 15;
                state->check = crc32(0L, Z_NULL, 0);
                CRC2(state->check, hold);
                INITBITS();
@ -672,7 +691,7 @@ int flush;
            len = BITS(4) + 8;
            if (state->wbits == 0)
                state->wbits = len;
-            else if (len > state->wbits) {
+            if (len > 15 || len > state->wbits) {
                strm->msg = (char *)"invalid window size";
                state->mode = BAD;
                break;
@ -699,14 +718,16 @@ int flush;
            }
            if (state->head != Z_NULL)
                state->head->text = (int)((hold >> 8) & 1);
-            if (state->flags & 0x0200) CRC2(state->check, hold);
+            if ((state->flags & 0x0200) && (state->wrap & 4))
                CRC2(state->check, hold);
            INITBITS();
            state->mode = TIME;
        case TIME:
            NEEDBITS(32);
            if (state->head != Z_NULL)
                state->head->time = hold;
-            if (state->flags & 0x0200) CRC4(state->check, hold);
+            if ((state->flags & 0x0200) && (state->wrap & 4))
                CRC4(state->check, hold);
            INITBITS();
            state->mode = OS;
        case OS:
@ -715,7 +736,8 @@ int flush;
                state->head->xflags = (int)(hold & 0xff);
                state->head->os = (int)(hold >> 8);
            }
-            if (state->flags & 0x0200) CRC2(state->check, hold);
+            if ((state->flags & 0x0200) && (state->wrap & 4))
                CRC2(state->check, hold);
            INITBITS();
            state->mode = EXLEN;
        case EXLEN:
@ -724,7 +746,8 @@ int flush;
                state->length = (unsigned)(hold);
                if (state->head != Z_NULL)
                    state->head->extra_len = (unsigned)hold;
-                if (state->flags & 0x0200) CRC2(state->check, hold);
+                if ((state->flags & 0x0200) && (state->wrap & 4))
                    CRC2(state->check, hold);
                INITBITS();
            }
            else if (state->head != Z_NULL)
@ -742,7 +765,7 @@ int flush;
                                len + copy > state->head->extra_max ?
                                state->head->extra_max - len : copy);
                    }
-                    if (state->flags & 0x0200)
+                    if ((state->flags & 0x0200) && (state->wrap & 4))
                        state->check = crc32(state->check, next, copy);
                    have -= copy;
                    next += copy;
@ -761,9 +784,9 @@ int flush;
                    if (state->head != Z_NULL &&
                            state->head->name != Z_NULL &&
                            state->length < state->head->name_max)
-                        state->head->name[state->length++] = len;
+                        state->head->name[state->length++] = (Bytef)len;
                } while (len && copy < have);
-                if (state->flags & 0x0200)
+                if ((state->flags & 0x0200) && (state->wrap & 4))
                    state->check = crc32(state->check, next, copy);
                have -= copy;
                next += copy;
@ -782,9 +805,9 @@ int flush;
                    if (state->head != Z_NULL &&
                            state->head->comment != Z_NULL &&
                            state->length < state->head->comm_max)
-                        state->head->comment[state->length++] = len;
+                        state->head->comment[state->length++] = (Bytef)len;
                } while (len && copy < have);
-                if (state->flags & 0x0200)
+                if ((state->flags & 0x0200) && (state->wrap & 4))
                    state->check = crc32(state->check, next, copy);
                have -= copy;
                next += copy;
@ -796,7 +819,7 @@ int flush;
        case HCRC:
            if (state->flags & 0x0200) {
                NEEDBITS(16);
-                if (hold != (state->check & 0xffff)) {
+                if ((state->wrap & 4) && hold != (state->check & 0xffff)) {
                    strm->msg = (char *)"header crc mismatch";
                    state->mode = BAD;
                    break;
@ -1177,11 +1200,11 @@ int flush;
                out -= left;
                strm->total_out += out;
                state->total += out;
-                if (out)
+                if ((state->wrap & 4) && out)
                    strm->adler = state->check =
                        UPDATE(state->check, put - out, out);
                out = left;
-                if ((
+                if ((state->wrap & 4) && (
 #ifdef GUNZIP
                     state->flags ? hold :
 #endif
@ -1240,10 +1263,10 @@ int flush;
    strm->total_in += in;
    strm->total_out += out;
    state->total += out;
-    if (state->wrap && out)
+    if ((state->wrap & 4) && out)
        strm->adler = state->check =
            UPDATE(state->check, strm->next_out - out, out);
-    strm->data_type = state->bits + (state->last ? 64 : 0) +
+    strm->data_type = (int)state->bits + (state->last ? 64 : 0) +
                      (state->mode == TYPE ? 128 : 0) +
                      (state->mode == LEN_ || state->mode == COPY_ ? 256 : 0);
    if (((in == 0 && out == 0) || flush == Z_FINISH) && ret == Z_OK)
@ -1255,7 +1278,7 @@ int ZEXPORT inflateEnd(strm)
 z_streamp strm;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
+    if (inflateStateCheck(strm))
        return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if (state->window != Z_NULL) ZFREE(strm, state->window);
@ -1273,7 +1296,7 @@ uInt *dictLength;
    struct inflate_state FAR *state;
    /* check state */
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    /* copy dictionary */
@ -1298,7 +1321,7 @@ uInt dictLength;
    int ret;
    /* check state */
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if (state->wrap != 0 && state->mode != DICT)
        return Z_STREAM_ERROR;
@ -1330,7 +1353,7 @@ gz_headerp head;
    struct inflate_state FAR *state;
    /* check state */
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if ((state->wrap & 2) == 0) return Z_STREAM_ERROR;
@ -1383,7 +1406,7 @@ z_streamp strm;
    struct inflate_state FAR *state;
    /* check parameters */
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if (strm->avail_in == 0 && state->bits < 8) return Z_BUF_ERROR;
@ -1430,7 +1453,7 @@ z_streamp strm;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    return state->mode == STORED && state->bits == 0;
 }
@ -1445,8 +1468,7 @@ z_streamp source;
    unsigned wsize;
    /* check input */
-    if (dest == Z_NULL || source == Z_NULL || source->state == Z_NULL ||
+    if (inflateStateCheck(source) || dest == Z_NULL)
        source->zalloc == (alloc_func)0 || source->zfree == (free_func)0)
        return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)source->state;
@ -1467,6 +1489,7 @@ z_streamp source;
    /* copy state */
    zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream));
    zmemcpy((voidpf)copy, (voidpf)state, sizeof(struct inflate_state));
    copy->strm = dest;
    if (state->lencode >= state->codes &&
        state->lencode <= state->codes + ENOUGH - 1) {
        copy->lencode = copy->codes + (state->lencode - state->codes);
@ -1488,25 +1511,51 @@ int subvert;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    state->sane = !subvert;
 #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
    state->sane = !subvert;
    return Z_OK;
 #else
    (void)subvert;
    state->sane = 1;
    return Z_DATA_ERROR;
 #endif
 }
 int ZEXPORT inflateValidate(strm, check)
 z_streamp strm;
 int check;
 {
    struct inflate_state FAR *state;
    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if (check)
        state->wrap |= 4;
    else
        state->wrap &= ~4;
    return Z_OK;
 }
 long ZEXPORT inflateMark(strm)
 z_streamp strm;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return -1L << 16;
+    if (inflateStateCheck(strm))
        return -(1L << 16);
    state = (struct inflate_state FAR *)strm->state;
-    return ((long)(state->back) << 16) +
+    return (long)(((unsigned long)((long)state->back)) << 16) +
        (state->mode == COPY ? state->length :
            (state->mode == MATCH ? state->was - state->length : 0));
 }
 unsigned long ZEXPORT inflateCodesUsed(strm)
 z_streamp strm;
 {
    struct inflate_state FAR *state;
    if (inflateStateCheck(strm)) return (unsigned long)-1;
    state = (struct inflate_state FAR *)strm->state;
    return (unsigned long)(state->next - state->codes);
 }
--- a/zlib/inflate.h
+++ b/zlib/inflate.h
@ -1,5 +1,5 @@
 /* inflate.h -- internal inflate state definition
- * Copyright (C) 1995-2009 Mark Adler
+ * Copyright (C) 1995-2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -18,7 +18,7 @@
 /* Possible inflate modes between inflate() calls */
 typedef enum {
-    HEAD,       /* i: waiting for magic header */
+    HEAD = 16180,   /* i: waiting for magic header */
    FLAGS,      /* i: waiting for method and flags (gzip) */
    TIME,       /* i: waiting for modification time (gzip) */
    OS,         /* i: waiting for extra flags and operating system (gzip) */
@ -77,11 +77,14 @@ typedef enum {
        CHECK -> LENGTH -> DONE
 */
-/* state maintained between inflate() calls.  Approximately 10K bytes. */
+/* State maintained between inflate() calls -- approximately 7K bytes, not
   including the allocated sliding window, which is up to 32K bytes. */
 struct inflate_state {
    z_streamp strm;             /* pointer back to this zlib stream */
    inflate_mode mode;          /* current inflate mode */
    int last;                   /* true if processing last block */
-    int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip */
+    int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip,
                                   bit 2 true to validate check value */
    int havedict;               /* true if dictionary provided */
    int flags;                  /* gzip header method and flags (0 if zlib) */
    unsigned dmax;              /* zlib header max distance (INFLATE_STRICT) */
--- a/zlib/inftrees.c
+++ b/zlib/inftrees.c
@ -1,5 +1,5 @@
 /* inftrees.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995-2013 Mark Adler
+ * Copyright (C) 1995-2017 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -9,7 +9,7 @@
 #define MAXBITS 15
 const char inflate_copyright[] =
-   " inflate 1.2.8 Copyright 1995-2013 Mark Adler ";
+   " inflate 1.2.11 Copyright 1995-2017 Mark Adler ";
 /*
  If you use the zlib library in a product, an acknowledgment is welcome
  in the documentation of your product. If for some reason you cannot
@ -54,7 +54,7 @@ unsigned short FAR *work;
    code FAR *next;             /* next available space in table */
    const unsigned short FAR *base;     /* base value table to use */
    const unsigned short FAR *extra;    /* extra bits table to use */
-    int end;                    /* use base and extra for symbol > end */
+    unsigned match;             /* use base and extra for symbol >= match */
    unsigned short count[MAXBITS+1];    /* number of codes of each length */
    unsigned short offs[MAXBITS+1];     /* offsets in table for each length */
    static const unsigned short lbase[31] = { /* Length codes 257..285 base */
@ -62,7 +62,7 @@ unsigned short FAR *work;
        35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
    static const unsigned short lext[31] = { /* Length codes 257..285 extra */
        16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
-        19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 72, 78};
+        19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 77, 202};
    static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
        257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
@ -181,19 +181,17 @@ unsigned short FAR *work;
    switch (type) {
    case CODES:
        base = extra = work;    /* dummy value--not used */
-        end = 19;
+        match = 20;
        break;
    case LENS:
        base = lbase;
        base -= 257;
        extra = lext;
-        extra -= 257;
+        match = 257;
        end = 256;
        break;
    default:    /* DISTS */
        base = dbase;
        extra = dext;
-        end = -1;
+        match = 0;
    }
    /* initialize state for loop */
@ -216,13 +214,13 @@ unsigned short FAR *work;
    for (;;) {
        /* create table entry */
        here.bits = (unsigned char)(len - drop);
-        if ((int)(work[sym]) < end) {
+        if (work[sym] + 1U < match) {
            here.op = (unsigned char)0;
            here.val = work[sym];
        }
-        else if ((int)(work[sym]) > end) {
+        else if (work[sym] >= match) {
-            here.op = (unsigned char)(extra[work[sym]]);
+            here.op = (unsigned char)(extra[work[sym] - match]);
-            here.val = base[work[sym]];
+            here.val = base[work[sym] - match];
        }
        else {
            here.op = (unsigned char)(32 + 64);         /* end of block */
--- a/zlib/trees.c
+++ b/zlib/trees.c
@ -1,5 +1,5 @@
 /* trees.c -- output deflated data using Huffman coding
- * Copyright (C) 1995-2012 Jean-loup Gailly
+ * Copyright (C) 1995-2017 Jean-loup Gailly
 * detect_data_type() function provided freely by Cosmin Truta, 2006
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -36,7 +36,7 @@
 #include "deflate.h"
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
 #  include <ctype.h>
 #endif
@ -122,13 +122,13 @@ struct static_tree_desc_s {
    int     max_length;          /* max bit length for the codes */
 };
-local static_tree_desc  static_l_desc =
+local const static_tree_desc  static_l_desc =
 {static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS};
-local static_tree_desc  static_d_desc =
+local const static_tree_desc  static_d_desc =
 {static_dtree, extra_dbits, 0,          D_CODES, MAX_BITS};
-local static_tree_desc  static_bl_desc =
+local const static_tree_desc  static_bl_desc =
 {(const ct_data *)0, extra_blbits, 0,   BL_CODES, MAX_BL_BITS};
 /* ===========================================================================
@ -152,18 +152,16 @@ local int  detect_data_type OF((deflate_state *s));
 local unsigned bi_reverse OF((unsigned value, int length));
 local void bi_windup      OF((deflate_state *s));
 local void bi_flush       OF((deflate_state *s));
 local void copy_block     OF((deflate_state *s, charf *buf, unsigned len,
                              int header));
 #ifdef GEN_TREES_H
 local void gen_trees_header OF((void));
 #endif
-#ifndef DEBUG
+#ifndef ZLIB_DEBUG
 #  define send_code(s, c, tree) send_bits(s, tree[c].Code, tree[c].Len)
   /* Send a code of the given tree. c and tree must not have side effects */
-#else /* DEBUG */
+#else /* !ZLIB_DEBUG */
 #  define send_code(s, c, tree) \
     { if (z_verbose>2) fprintf(stderr,"\ncd %3d ",(c)); \
       send_bits(s, tree[c].Code, tree[c].Len); }
@ -182,7 +180,7 @@ local void gen_trees_header OF((void));
 * Send a value on a given number of bits.
 * IN assertion: length <= 16 and value fits in length bits.
 */
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
 local void send_bits      OF((deflate_state *s, int value, int length));
 local void send_bits(s, value, length)
@ -208,12 +206,12 @@ local void send_bits(s, value, length)
        s->bi_valid += length;
    }
 }
-#else /* !DEBUG */
+#else /* !ZLIB_DEBUG */
 #define send_bits(s, value, length) \
 { int len = length;\
  if (s->bi_valid > (int)Buf_size - len) {\
-    int val = value;\
+    int val = (int)value;\
    s->bi_buf |= (ush)val << s->bi_valid;\
    put_short(s, s->bi_buf);\
    s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\
@ -223,7 +221,7 @@ local void send_bits(s, value, length)
    s->bi_valid += len;\
  }\
 }
-#endif /* DEBUG */
+#endif /* ZLIB_DEBUG */
 /* the arguments must not have side effects */
@ -317,7 +315,7 @@ local void tr_static_init()
 * Genererate the file trees.h describing the static trees.
 */
 #ifdef GEN_TREES_H
-#  ifndef DEBUG
+#  ifndef ZLIB_DEBUG
 #    include <stdio.h>
 #  endif
@ -394,7 +392,7 @@ void ZLIB_INTERNAL _tr_init(s)
    s->bi_buf = 0;
    s->bi_valid = 0;
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
    s->compressed_len = 0L;
    s->bits_sent = 0L;
 #endif
@ -522,12 +520,12 @@ local void gen_bitlen(s, desc)
        xbits = 0;
        if (n >= base) xbits = extra[n-base];
        f = tree[n].Freq;
-        s->opt_len += (ulg)f * (bits + xbits);
+        s->opt_len += (ulg)f * (unsigned)(bits + xbits);
-        if (stree) s->static_len += (ulg)f * (stree[n].Len + xbits);
+        if (stree) s->static_len += (ulg)f * (unsigned)(stree[n].Len + xbits);
    }
    if (overflow == 0) return;
-    Trace((stderr,"\nbit length overflow\n"));
+    Tracev((stderr,"\nbit length overflow\n"));
    /* This happens for example on obj2 and pic of the Calgary corpus */
    /* Find the first bit length which could increase: */
@ -554,9 +552,8 @@ local void gen_bitlen(s, desc)
            m = s->heap[--h];
            if (m > max_code) continue;
            if ((unsigned) tree[m].Len != (unsigned) bits) {
-                Trace((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
+                Tracev((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
-                s->opt_len += ((long)bits - (long)tree[m].Len)
+                s->opt_len += ((ulg)bits - tree[m].Len) * tree[m].Freq;
                              *(long)tree[m].Freq;
                tree[m].Len = (ush)bits;
            }
            n--;
@ -578,7 +575,7 @@ local void gen_codes (tree, max_code, bl_count)
    ushf *bl_count;            /* number of codes at each bit length */
 {
    ush next_code[MAX_BITS+1]; /* next code value for each bit length */
-    ush code = 0;              /* running code value */
+    unsigned code = 0;         /* running code value */
    int bits;                  /* bit index */
    int n;                     /* code index */
@ -586,7 +583,8 @@ local void gen_codes (tree, max_code, bl_count)
     * without bit reversal.
     */
    for (bits = 1; bits <= MAX_BITS; bits++) {
-        next_code[bits] = code = (code + bl_count[bits-1]) << 1;
+        code = (code + bl_count[bits-1]) << 1;
        next_code[bits] = (ush)code;
    }
    /* Check that the bit counts in bl_count are consistent. The last code
     * must be all ones.
@ -599,7 +597,7 @@ local void gen_codes (tree, max_code, bl_count)
        int len = tree[n].Len;
        if (len == 0) continue;
        /* Now reverse the bits */
-        tree[n].Code = bi_reverse(next_code[len]++, len);
+        tree[n].Code = (ush)bi_reverse(next_code[len]++, len);
        Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
             n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
@ -821,7 +819,7 @@ local int build_bl_tree(s)
        if (s->bl_tree[bl_order[max_blindex]].Len != 0) break;
    }
    /* Update opt_len to include the bit length tree and counts */
-    s->opt_len += 3*(max_blindex+1) + 5+5+4;
+    s->opt_len += 3*((ulg)max_blindex+1) + 5+5+4;
    Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld",
            s->opt_len, s->static_len));
@ -869,11 +867,17 @@ void ZLIB_INTERNAL _tr_stored_block(s, buf, stored_len, last)
    int last;         /* one if this is the last block for a file */
 {
    send_bits(s, (STORED_BLOCK<<1)+last, 3);    /* send block type */
-#ifdef DEBUG
+    bi_windup(s);        /* align on byte boundary */
    put_short(s, (ush)stored_len);
    put_short(s, (ush)~stored_len);
    zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
    s->pending += stored_len;
 #ifdef ZLIB_DEBUG
    s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;
    s->compressed_len += (stored_len + 4) << 3;
    s->bits_sent += 2*16;
    s->bits_sent += stored_len<<3;
 #endif
    copy_block(s, buf, (unsigned)stored_len, 1); /* with header */
 }
 /* ===========================================================================
@ -894,7 +898,7 @@ void ZLIB_INTERNAL _tr_align(s)
 {
    send_bits(s, STATIC_TREES<<1, 3);
    send_code(s, END_BLOCK, static_ltree);
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
    s->compressed_len += 10L; /* 3 for block type, 7 for EOB */
 #endif
    bi_flush(s);
@ -902,7 +906,7 @@ void ZLIB_INTERNAL _tr_align(s)
 /* ===========================================================================
 * Determine the best encoding for the current block: dynamic trees, static
- * trees or store, and output the encoded block to the zip file.
+ * trees or store, and write out the encoded block.
 */
 void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
    deflate_state *s;
@ -974,7 +978,7 @@ void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
        send_bits(s, (STATIC_TREES<<1)+last, 3);
        compress_block(s, (const ct_data *)static_ltree,
                       (const ct_data *)static_dtree);
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
        s->compressed_len += 3 + s->static_len;
 #endif
    } else {
@ -983,7 +987,7 @@ void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
                       max_blindex+1);
        compress_block(s, (const ct_data *)s->dyn_ltree,
                       (const ct_data *)s->dyn_dtree);
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
        s->compressed_len += 3 + s->opt_len;
 #endif
    }
@ -995,7 +999,7 @@ void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
    if (last) {
        bi_windup(s);
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
        s->compressed_len += 7;  /* align on byte boundary */
 #endif
    }
@ -1090,7 +1094,7 @@ local void compress_block(s, ltree, dtree)
            send_code(s, code, dtree);       /* send the distance code */
            extra = extra_dbits[code];
            if (extra != 0) {
-                dist -= base_dist[code];
+                dist -= (unsigned)base_dist[code];
                send_bits(s, dist, extra);   /* send the extra distance bits */
            }
        } /* literal or match pair ? */
@ -1193,34 +1197,7 @@ local void bi_windup(s)
    }
    s->bi_buf = 0;
    s->bi_valid = 0;
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
    s->bits_sent = (s->bits_sent+7) & ~7;
 #endif
 }
 /* ===========================================================================
 * Copy a stored block, storing first the length and its
 * one's complement if requested.
 */
 local void copy_block(s, buf, len, header)
    deflate_state *s;
    charf    *buf;    /* the input data */
    unsigned len;     /* its length */
    int      header;  /* true if block header must be written */
 {
    bi_windup(s);        /* align on byte boundary */
    if (header) {
        put_short(s, (ush)len);
        put_short(s, (ush)~len);
 #ifdef DEBUG
        s->bits_sent += 2*16;
 #endif
    }
 #ifdef DEBUG
    s->bits_sent += (ulg)len<<3;
 #endif
    while (len--) {
        put_byte(s, *buf++);
    }
 }
--- a/zlib/uncompr.c
+++ b/zlib/uncompr.c
@ -1,5 +1,5 @@
 /* uncompr.c -- decompress a memory buffer
- * Copyright (C) 1995-2003, 2010 Jean-loup Gailly.
+ * Copyright (C) 1995-2003, 2010, 2014, 2016 Jean-loup Gailly, Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -9,51 +9,85 @@
 #include "zlib.h"
 /* ===========================================================================
-     Decompresses the source buffer into the destination buffer.  sourceLen is
+     Decompresses the source buffer into the destination buffer.  *sourceLen is
-   the byte length of the source buffer. Upon entry, destLen is the total
+   the byte length of the source buffer. Upon entry, *destLen is the total size
-   size of the destination buffer, which must be large enough to hold the
+   of the destination buffer, which must be large enough to hold the entire
-   entire uncompressed data. (The size of the uncompressed data must have
+   uncompressed data. (The size of the uncompressed data must have been saved
-   been saved previously by the compressor and transmitted to the decompressor
+   previously by the compressor and transmitted to the decompressor by some
-   by some mechanism outside the scope of this compression library.)
+   mechanism outside the scope of this compression library.) Upon exit,
-   Upon exit, destLen is the actual size of the compressed buffer.
+   *destLen is the size of the decompressed data and *sourceLen is the number
   of source bytes consumed. Upon return, source + *sourceLen points to the
   first unused input byte.
-     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
+     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   enough memory, Z_BUF_ERROR if there was not enough room in the output
+   memory, Z_BUF_ERROR if there was not enough room in the output buffer, or
-   buffer, or Z_DATA_ERROR if the input data was corrupted.
+   Z_DATA_ERROR if the input data was corrupted, including if the input data is
   an incomplete zlib stream.
 */
 int ZEXPORT uncompress2 (dest, destLen, source, sourceLen)
    Bytef *dest;
    uLongf *destLen;
    const Bytef *source;
    uLong *sourceLen;
 {
    z_stream stream;
    int err;
    const uInt max = (uInt)-1;
    uLong len, left;
    Byte buf[1];    /* for detection of incomplete stream when *destLen == 0 */
    len = *sourceLen;
    if (*destLen) {
        left = *destLen;
        *destLen = 0;
    }
    else {
        left = 1;
        dest = buf;
    }
    stream.next_in = (z_const Bytef *)source;
    stream.avail_in = 0;
    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;
    stream.opaque = (voidpf)0;
    err = inflateInit(&stream);
    if (err != Z_OK) return err;
    stream.next_out = dest;
    stream.avail_out = 0;
    do {
        if (stream.avail_out == 0) {
            stream.avail_out = left > (uLong)max ? max : (uInt)left;
            left -= stream.avail_out;
        }
        if (stream.avail_in == 0) {
            stream.avail_in = len > (uLong)max ? max : (uInt)len;
            len -= stream.avail_in;
        }
        err = inflate(&stream, Z_NO_FLUSH);
    } while (err == Z_OK);
    *sourceLen -= len + stream.avail_in;
    if (dest != buf)
        *destLen = stream.total_out;
    else if (stream.total_out && err == Z_BUF_ERROR)
        left = 1;
    inflateEnd(&stream);
    return err == Z_STREAM_END ? Z_OK :
           err == Z_NEED_DICT ? Z_DATA_ERROR  :
           err == Z_BUF_ERROR && left + stream.avail_out ? Z_DATA_ERROR :
           err;
 }
 int ZEXPORT uncompress (dest, destLen, source, sourceLen)
    Bytef *dest;
    uLongf *destLen;
    const Bytef *source;
    uLong sourceLen;
 {
-    z_stream stream;
+    return uncompress2(dest, destLen, source, &sourceLen);
    int err;
    stream.next_in = (z_const Bytef *)source;
    stream.avail_in = (uInt)sourceLen;
    /* Check for source > 64K on 16-bit machine: */
    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
    stream.next_out = dest;
    stream.avail_out = (uInt)*destLen;
    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;
    err = inflateInit(&stream);
    if (err != Z_OK) return err;
    err = inflate(&stream, Z_FINISH);
    if (err != Z_STREAM_END) {
        inflateEnd(&stream);
        if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
            return Z_DATA_ERROR;
        return err;
    }
    *destLen = stream.total_out;
    err = inflateEnd(&stream);
    return err;
 }
--- a/zlib/zconf.h
+++ b/zlib/zconf.h
@ -4,7 +4,7 @@
 /* FLTK ***************************************************************	*/
 /* zconf.h -- configuration of the zlib compression library
- * Copyright (C) 1995-2013 Jean-loup Gailly.
+ * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -26,7 +26,7 @@
 #ifdef Z_PREFIX     /* may be set to #if 1 by ./configure */
 #  define Z_PREFIX_SET
-/* all linked symbols */
+/* all linked symbols and init macros */
 #  define _dist_code            z__dist_code
 #  define _length_code          z__length_code
 #  define _tr_align             z__tr_align
@ -38,6 +38,7 @@
 #  define adler32               z_adler32
 #  define adler32_combine       z_adler32_combine
 #  define adler32_combine64     z_adler32_combine64
 #  define adler32_z             z_adler32_z
 #  ifndef Z_SOLO
 #    define compress              z_compress
 #    define compress2             z_compress2
@ -46,10 +47,14 @@
 #  define crc32                 z_crc32
 #  define crc32_combine         z_crc32_combine
 #  define crc32_combine64       z_crc32_combine64
 #  define crc32_z               z_crc32_z
 #  define deflate               z_deflate
 #  define deflateBound          z_deflateBound
 #  define deflateCopy           z_deflateCopy
 #  define deflateEnd            z_deflateEnd
 #  define deflateGetDictionary  z_deflateGetDictionary
 #  define deflateInit           z_deflateInit
 #  define deflateInit2          z_deflateInit2
 #  define deflateInit2_         z_deflateInit2_
 #  define deflateInit_          z_deflateInit_
 #  define deflateParams         z_deflateParams
@ -76,6 +81,8 @@
 #    define gzeof                 z_gzeof
 #    define gzerror               z_gzerror
 #    define gzflush               z_gzflush
 #    define gzfread               z_gzfread
 #    define gzfwrite              z_gzfwrite
 #    define gzgetc                z_gzgetc
 #    define gzgetc_               z_gzgetc_
 #    define gzgets                z_gzgets
@ -87,7 +94,6 @@
 #      define gzopen_w              z_gzopen_w
 #    endif
 #    define gzprintf              z_gzprintf
 #    define gzvprintf             z_gzvprintf
 #    define gzputc                z_gzputc
 #    define gzputs                z_gzputs
 #    define gzread                z_gzread
@ -98,32 +104,39 @@
 #    define gztell                z_gztell
 #    define gztell64              z_gztell64
 #    define gzungetc              z_gzungetc
 #    define gzvprintf             z_gzvprintf
 #    define gzwrite               z_gzwrite
 #  endif
 #  define inflate               z_inflate
 #  define inflateBack           z_inflateBack
 #  define inflateBackEnd        z_inflateBackEnd
 #  define inflateBackInit       z_inflateBackInit
 #  define inflateBackInit_      z_inflateBackInit_
 #  define inflateCodesUsed      z_inflateCodesUsed
 #  define inflateCopy           z_inflateCopy
 #  define inflateEnd            z_inflateEnd
 #  define inflateGetDictionary  z_inflateGetDictionary
 #  define inflateGetHeader      z_inflateGetHeader
 #  define inflateInit           z_inflateInit
 #  define inflateInit2          z_inflateInit2
 #  define inflateInit2_         z_inflateInit2_
 #  define inflateInit_          z_inflateInit_
 #  define inflateMark           z_inflateMark
 #  define inflatePrime          z_inflatePrime
 #  define inflateReset          z_inflateReset
 #  define inflateReset2         z_inflateReset2
 #  define inflateResetKeep      z_inflateResetKeep
 #  define inflateSetDictionary  z_inflateSetDictionary
 #  define inflateGetDictionary  z_inflateGetDictionary
 #  define inflateSync           z_inflateSync
 #  define inflateSyncPoint      z_inflateSyncPoint
 #  define inflateUndermine      z_inflateUndermine
-#  define inflateResetKeep      z_inflateResetKeep
+#  define inflateValidate       z_inflateValidate
 #  define inflate_copyright     z_inflate_copyright
 #  define inflate_fast          z_inflate_fast
 #  define inflate_table         z_inflate_table
 #  ifndef Z_SOLO
 #    define uncompress            z_uncompress
 #    define uncompress2           z_uncompress2
 #  endif
 #  define zError                z_zError
 #  ifndef Z_SOLO
@ -233,9 +246,19 @@
 #  define z_const
 #endif
-/* Some Mac compilers merge all .h files incorrectly: */
+#ifdef Z_SOLO
-#if defined(__MWERKS__)||defined(applec)||defined(THINK_C)||defined(__SC__)
+   typedef unsigned long z_size_t;
-#  define NO_DUMMY_DECL
+#else
 #  define z_longlong long long
 #  if defined(NO_SIZE_T)
     typedef unsigned NO_SIZE_T z_size_t;
 #  elif defined(STDC)
 #    include <stddef.h>
     typedef size_t z_size_t;
 #  else
     typedef unsigned long z_size_t;
 #  endif
 #  undef z_longlong
 #endif
 /* Maximum value for memLevel in deflateInit2 */
@ -265,7 +288,7 @@
 Of course this will generally degrade compression (there's no free lunch).
   The memory requirements for inflate are (in bytes) 1 << windowBits
- that is, 32K for windowBits=15 (default value) plus a few kilobytes
+ that is, 32K for windowBits=15 (default value) plus about 7 kilobytes
 for small objects.
 */
--- a/zlib/zlib.3
+++ b/zlib/zlib.3
@ -1,4 +1,4 @@
-.TH ZLIB 3 "28 Apr 2013"
+.TH ZLIB 3 "15 Jan 2017"
 .SH NAME
 zlib \- compression/decompression library
 .SH SYNOPSIS
@ -48,32 +48,10 @@ Changes to this version are documented in the file
 that accompanies the source.
 .LP
 .I zlib
-is available in Java using the java.util.zip package:
+is built in to many languages and operating systems, including but not limited to
-.IP
+Java, Python, .NET, PHP, Perl, Ruby, Swift, and Go.
 http://java.sun.com/developer/technicalArticles/Programming/compression/
 .LP
-A Perl interface to
+An experimental package to read and write files in the .zip format,
 .IR zlib ,
 written by Paul Marquess (pmqs@cpan.org),
 is available at CPAN (Comprehensive Perl Archive Network) sites,
 including:
 .IP
 http://search.cpan.org/~pmqs/IO-Compress-Zlib/
 .LP
 A Python interface to
 .IR zlib ,
 written by A.M. Kuchling (amk@magnet.com),
 is available in Python 1.5 and later versions:
 .IP
 http://docs.python.org/library/zlib.html
 .LP
 .I zlib
 is built into
 .IR tcl:
 .IP
 http://wiki.tcl.tk/4610
 .LP
 An experimental package to read and write files in .zip format,
 written on top of
 .I zlib
 by Gilles Vollant (info@winimage.com),
@ -92,7 +70,9 @@ web site can be found at:
 .IP
 http://zlib.net/
 .LP
-The data format used by the zlib library is described by RFC
+The data format used by the
 .I zlib
 library is described by RFC
 (Request for Comments) 1950 to 1952 in the files:
 .IP
 http://tools.ietf.org/html/rfc1950 (for the zlib header and trailer format)
@ -124,17 +104,35 @@ http://zlib.net/zlib_faq.html
 before asking for help.
 Send questions and/or comments to zlib@gzip.org,
 or (for the Windows DLL version) to Gilles Vollant (info@winimage.com).
-.SH AUTHORS
+.SH AUTHORS AND LICENSE
-Version 1.2.8
+Version 1.2.11
 Copyright (C) 1995-2013 Jean-loup Gailly (jloup@gzip.org)
 and Mark Adler (madler@alumni.caltech.edu).
 .LP
-This software is provided "as-is,"
+Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
-without any express or implied warranty.
+.LP
-In no event will the authors be held liable for any damages
+This software is provided 'as-is', without any express or implied
 warranty.  In no event will the authors be held liable for any damages
 arising from the use of this software.
-See the distribution directory with respect to requirements
+.LP
-governing redistribution.
+Permission is granted to anyone to use this software for any purpose,
 including commercial applications, and to alter it and redistribute it
 freely, subject to the following restrictions:
 .LP
 .nr step 1 1
 .IP \n[step]. 3
 The origin of this software must not be misrepresented; you must not
 claim that you wrote the original software. If you use this software
 in a product, an acknowledgment in the product documentation would be
 appreciated but is not required.
 .IP \n+[step].
 Altered source versions must be plainly marked as such, and must not be
 misrepresented as being the original software.
 .IP \n+[step].
 This notice may not be removed or altered from any source distribution.
 .LP
 Jean-loup Gailly        Mark Adler
 .br
 jloup@gzip.org          madler@alumni.caltech.edu
 .LP
 The deflate format used by
 .I zlib
 was defined by Phil Katz.
--- a/zlib/zlib.h
+++ b/zlib/zlib.h
@ -1,7 +1,7 @@
 /* zlib.h -- interface of the 'zlib' general purpose compression library
-  version 1.2.8, April 28th, 2013
+  version 1.2.11, January 15th, 2017
-  Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler
+  Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
@ -37,11 +37,11 @@
 extern "C" {
 #endif
-#define ZLIB_VERSION "1.2.8"
+#define ZLIB_VERSION "1.2.11"
-#define ZLIB_VERNUM 0x1280
+#define ZLIB_VERNUM 0x12b0
 #define ZLIB_VER_MAJOR 1
 #define ZLIB_VER_MINOR 2
-#define ZLIB_VER_REVISION 8
+#define ZLIB_VER_REVISION 11
 #define ZLIB_VER_SUBREVISION 0
 /*
@ -65,7 +65,8 @@ extern "C" {
  with "gz".  The gzip format is different from the zlib format.  gzip is a
  gzip wrapper, documented in RFC 1952, wrapped around a deflate stream.
-    This library can optionally read and write gzip streams in memory as well.
+    This library can optionally read and write gzip and raw deflate streams in
  memory as well.
    The zlib format was designed to be compact and fast for use in memory
  and on communications channels.  The gzip format was designed for single-
@ -74,7 +75,7 @@ extern "C" {
    The library does not install any signal handler.  The decoder checks
  the consistency of the compressed data, so the library should never crash
-  even in case of corrupted input.
+  even in the case of corrupted input.
 */
 typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
@ -87,7 +88,7 @@ typedef struct z_stream_s {
    uInt     avail_in;  /* number of bytes available at next_in */
    uLong    total_in;  /* total number of input bytes read so far */
-    Bytef    *next_out; /* next output byte should be put there */
+    Bytef    *next_out; /* next output byte will go here */
    uInt     avail_out; /* remaining free space at next_out */
    uLong    total_out; /* total number of bytes output so far */
@ -98,8 +99,9 @@ typedef struct z_stream_s {
    free_func  zfree;   /* used to free the internal state */
    voidpf     opaque;  /* private data object passed to zalloc and zfree */
-    int     data_type;  /* best guess about the data type: binary or text */
+    int     data_type;  /* best guess about the data type: binary or text
-    uLong   adler;      /* adler32 value of the uncompressed data */
+                           for deflate, or the decoding state for inflate */
    uLong   adler;      /* Adler-32 or CRC-32 value of the uncompressed data */
    uLong   reserved;   /* reserved for future use */
 } z_stream;
@ -142,7 +144,9 @@ typedef gz_header FAR *gz_headerp;
     zalloc must return Z_NULL if there is not enough memory for the object.
   If zlib is used in a multi-threaded application, zalloc and zfree must be
-   thread safe.
+   thread safe.  In that case, zlib is thread-safe.  When zalloc and zfree are
   Z_NULL on entry to the initialization function, they are set to internal
   routines that use the standard library functions malloc() and free().
     On 16-bit systems, the functions zalloc and zfree must be able to allocate
   exactly 65536 bytes, but will not be required to allocate more than this if
@ -155,7 +159,7 @@ typedef gz_header FAR *gz_headerp;
     The fields total_in and total_out can be used for statistics or progress
   reports.  After compression, total_in holds the total size of the
-   uncompressed data and may be saved for use in the decompressor (particularly
+   uncompressed data and may be saved for use by the decompressor (particularly
   if the decompressor wants to decompress everything in a single step).
 */
@ -200,7 +204,7 @@ typedef gz_header FAR *gz_headerp;
 #define Z_TEXT     1
 #define Z_ASCII    Z_TEXT   /* for compatibility with 1.2.2 and earlier */
 #define Z_UNKNOWN  2
-/* Possible values of the data_type field (though see inflate()) */
+/* Possible values of the data_type field for deflate() */
 #define Z_DEFLATED   8
 /* The deflate compression method (the only one supported in this version) */
@ -258,11 +262,11 @@ ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
    enough room in the output buffer), next_in and avail_in are updated and
    processing will resume at this point for the next call of deflate().
-  - Provide more output starting at next_out and update next_out and avail_out
+  - Generate more output starting at next_out and update next_out and avail_out
    accordingly.  This action is forced if the parameter flush is non zero.
    Forcing flush frequently degrades the compression ratio, so this parameter
-    should be set only when necessary (in interactive applications).  Some
+    should be set only when necessary.  Some output may be provided even if
-    output may be provided even if flush is not set.
+    flush is zero.
    Before the call of deflate(), the application should ensure that at least
  one of the actions is possible, by providing more input and/or consuming more
@ -271,7 +275,9 @@ ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
  output when it wants, for example when the output buffer is full (avail_out
  == 0), or after each call of deflate().  If deflate returns Z_OK and with
  zero avail_out, it must be called again after making room in the output
-  buffer because there might be more output pending.
+  buffer because there might be more output pending. See deflatePending(),
  which can be used if desired to determine whether or not there is more ouput
  in that case.
    Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to
  decide how much data to accumulate before producing output, in order to
@ -292,8 +298,8 @@ ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
  input data so far will be available to the decompressor, as for Z_SYNC_FLUSH.
  This completes the current deflate block and follows it with an empty fixed
  codes block that is 10 bits long.  This assures that enough bytes are output
-  in order for the decompressor to finish the block before the empty fixed code
+  in order for the decompressor to finish the block before the empty fixed
-  block.
+  codes block.
    If flush is set to Z_BLOCK, a deflate block is completed and emitted, as
  for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to
@ -319,34 +325,38 @@ ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
    If the parameter flush is set to Z_FINISH, pending input is processed,
  pending output is flushed and deflate returns with Z_STREAM_END if there was
-  enough output space; if deflate returns with Z_OK, this function must be
+  enough output space.  If deflate returns with Z_OK or Z_BUF_ERROR, this
-  called again with Z_FINISH and more output space (updated avail_out) but no
+  function must be called again with Z_FINISH and more output space (updated
-  more input data, until it returns with Z_STREAM_END or an error.  After
+  avail_out) but no more input data, until it returns with Z_STREAM_END or an
-  deflate has returned Z_STREAM_END, the only possible operations on the stream
+  error.  After deflate has returned Z_STREAM_END, the only possible operations
-  are deflateReset or deflateEnd.
+  on the stream are deflateReset or deflateEnd.
-    Z_FINISH can be used immediately after deflateInit if all the compression
+    Z_FINISH can be used in the first deflate call after deflateInit if all the
-  is to be done in a single step.  In this case, avail_out must be at least the
+  compression is to be done in a single step.  In order to complete in one
-  value returned by deflateBound (see below).  Then deflate is guaranteed to
+  call, avail_out must be at least the value returned by deflateBound (see
-  return Z_STREAM_END.  If not enough output space is provided, deflate will
+  below).  Then deflate is guaranteed to return Z_STREAM_END.  If not enough
-  not return Z_STREAM_END, and it must be called again as described above.
+  output space is provided, deflate will not return Z_STREAM_END, and it must
  be called again as described above.
-    deflate() sets strm->adler to the adler32 checksum of all input read
+    deflate() sets strm->adler to the Adler-32 checksum of all input read
-  so far (that is, total_in bytes).
+  so far (that is, total_in bytes).  If a gzip stream is being generated, then
  strm->adler will be the CRC-32 checksum of the input read so far.  (See
  deflateInit2 below.)
    deflate() may update strm->data_type if it can make a good guess about
-  the input data type (Z_BINARY or Z_TEXT).  In doubt, the data is considered
+  the input data type (Z_BINARY or Z_TEXT).  If in doubt, the data is
-  binary.  This field is only for information purposes and does not affect the
+  considered binary.  This field is only for information purposes and does not
-  compression algorithm in any manner.
+  affect the compression algorithm in any manner.
    deflate() returns Z_OK if some progress has been made (more input
  processed or more output produced), Z_STREAM_END if all input has been
  consumed and all output has been produced (only when flush is set to
  Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
-  if next_in or next_out was Z_NULL), Z_BUF_ERROR if no progress is possible
+  if next_in or next_out was Z_NULL or the state was inadvertently written over
-  (for example avail_in or avail_out was zero).  Note that Z_BUF_ERROR is not
+  by the application), or Z_BUF_ERROR if no progress is possible (for example
-  fatal, and deflate() can be called again with more input and more output
+  avail_in or avail_out was zero).  Note that Z_BUF_ERROR is not fatal, and
-  space to continue compressing.
+  deflate() can be called again with more input and more output space to
  continue compressing.
 */
@ -369,23 +379,21 @@ ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm));
     Initializes the internal stream state for decompression.  The fields
   next_in, avail_in, zalloc, zfree and opaque must be initialized before by
-   the caller.  If next_in is not Z_NULL and avail_in is large enough (the
+   the caller.  In the current version of inflate, the provided input is not
-   exact value depends on the compression method), inflateInit determines the
+   read or consumed.  The allocation of a sliding window will be deferred to
-   compression method from the zlib header and allocates all data structures
+   the first call of inflate (if the decompression does not complete on the
-   accordingly; otherwise the allocation will be deferred to the first call of
+   first call).  If zalloc and zfree are set to Z_NULL, inflateInit updates
-   inflate.  If zalloc and zfree are set to Z_NULL, inflateInit updates them to
+   them to use default allocation functions.
   use default allocation functions.
     inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
   version assumed by the caller, or Z_STREAM_ERROR if the parameters are
   invalid, such as a null pointer to the structure.  msg is set to null if
-   there is no error message.  inflateInit does not perform any decompression
+   there is no error message.  inflateInit does not perform any decompression.
-   apart from possibly reading the zlib header if present: actual decompression
+   Actual decompression will be done by inflate().  So next_in, and avail_in,
-   will be done by inflate().  (So next_in and avail_in may be modified, but
+   next_out, and avail_out are unused and unchanged.  The current
-   next_out and avail_out are unused and unchanged.) The current implementation
+   implementation of inflateInit() does not process any header information --
-   of inflateInit() does not process any header information -- that is deferred
+   that is deferred until inflate() is called.
   until inflate() is called.
 */
@ -401,17 +409,20 @@ ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
  - Decompress more input starting at next_in and update next_in and avail_in
    accordingly.  If not all input can be processed (because there is not
-    enough room in the output buffer), next_in is updated and processing will
+    enough room in the output buffer), then next_in and avail_in are updated
-    resume at this point for the next call of inflate().
+    accordingly, and processing will resume at this point for the next call of
    inflate().
-  - Provide more output starting at next_out and update next_out and avail_out
+  - Generate more output starting at next_out and update next_out and avail_out
    accordingly.  inflate() provides as much output as possible, until there is
    no more input data or no more space in the output buffer (see below about
    the flush parameter).
    Before the call of inflate(), the application should ensure that at least
  one of the actions is possible, by providing more input and/or consuming more
-  output, and updating the next_* and avail_* values accordingly.  The
+  output, and updating the next_* and avail_* values accordingly.  If the
  caller of inflate() does not provide both available input and available
  output space, it is possible that there will be no progress made.  The
  application can consume the uncompressed output when it wants, for example
  when the output buffer is full (avail_out == 0), or after each call of
  inflate().  If inflate returns Z_OK and with zero avail_out, it must be
@ -428,7 +439,7 @@ ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
  gets to the end of that block, or when it runs out of data.
    The Z_BLOCK option assists in appending to or combining deflate streams.
-  Also to assist in this, on return inflate() will set strm->data_type to the
+  To assist in this, on return inflate() always sets strm->data_type to the
  number of unused bits in the last byte taken from strm->next_in, plus 64 if
  inflate() is currently decoding the last block in the deflate stream, plus
  128 if inflate() returned immediately after decoding an end-of-block code or
@ -476,32 +487,33 @@ ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
  chosen by the compressor and returns Z_NEED_DICT; otherwise it sets
  strm->adler to the Adler-32 checksum of all output produced so far (that is,
  total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described
-  below.  At the end of the stream, inflate() checks that its computed adler32
+  below.  At the end of the stream, inflate() checks that its computed Adler-32
  checksum is equal to that saved by the compressor and returns Z_STREAM_END
  only if the checksum is correct.
    inflate() can decompress and check either zlib-wrapped or gzip-wrapped
  deflate data.  The header type is detected automatically, if requested when
  initializing with inflateInit2().  Any information contained in the gzip
-  header is not retained, so applications that need that information should
+  header is not retained unless inflateGetHeader() is used.  When processing
  instead use raw inflate, see inflateInit2() below, or inflateBack() and
  perform their own processing of the gzip header and trailer.  When processing
  gzip-wrapped deflate data, strm->adler32 is set to the CRC-32 of the output
-  producted so far.  The CRC-32 is checked against the gzip trailer.
+  produced so far.  The CRC-32 is checked against the gzip trailer, as is the
  uncompressed length, modulo 2^32.
    inflate() returns Z_OK if some progress has been made (more input processed
  or more output produced), Z_STREAM_END if the end of the compressed data has
  been reached and all uncompressed output has been produced, Z_NEED_DICT if a
  preset dictionary is needed at this point, Z_DATA_ERROR if the input data was
  corrupted (input stream not conforming to the zlib format or incorrect check
-  value), Z_STREAM_ERROR if the stream structure was inconsistent (for example
+  value, in which case strm->msg points to a string with a more specific
-  next_in or next_out was Z_NULL), Z_MEM_ERROR if there was not enough memory,
+  error), Z_STREAM_ERROR if the stream structure was inconsistent (for example
-  Z_BUF_ERROR if no progress is possible or if there was not enough room in the
+  next_in or next_out was Z_NULL, or the state was inadvertently written over
-  output buffer when Z_FINISH is used.  Note that Z_BUF_ERROR is not fatal, and
+  by the application), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR
  if no progress was possible or if there was not enough room in the output
  buffer when Z_FINISH is used.  Note that Z_BUF_ERROR is not fatal, and
  inflate() can be called again with more input and more output space to
  continue decompressing.  If Z_DATA_ERROR is returned, the application may
  then call inflateSync() to look for a good compression block if a partial
-  recovery of the data is desired.
+  recovery of the data is to be attempted.
 */
@ -511,9 +523,8 @@ ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm));
   This function discards any unprocessed input and does not flush any pending
   output.
-     inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
+     inflateEnd returns Z_OK if success, or Z_STREAM_ERROR if the stream state
-   was inconsistent.  In the error case, msg may be set but then points to a
+   was inconsistent.
   static string (which must not be deallocated).
 */
@ -544,16 +555,29 @@ ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
   compression at the expense of memory usage.  The default value is 15 if
   deflateInit is used instead.
     For the current implementation of deflate(), a windowBits value of 8 (a
   window size of 256 bytes) is not supported.  As a result, a request for 8
   will result in 9 (a 512-byte window).  In that case, providing 8 to
   inflateInit2() will result in an error when the zlib header with 9 is
   checked against the initialization of inflate().  The remedy is to not use 8
   with deflateInit2() with this initialization, or at least in that case use 9
   with inflateInit2().
     windowBits can also be -8..-15 for raw deflate.  In this case, -windowBits
   determines the window size.  deflate() will then generate raw deflate data
-   with no zlib header or trailer, and will not compute an adler32 check value.
+   with no zlib header or trailer, and will not compute a check value.
     windowBits can also be greater than 15 for optional gzip encoding.  Add
   16 to windowBits to write a simple gzip header and trailer around the
   compressed data instead of a zlib wrapper.  The gzip header will have no
   file name, no extra data, no comment, no modification time (set to zero), no
-   header crc, and the operating system will be set to 255 (unknown).  If a
+   header crc, and the operating system will be set to the appropriate value,
-   gzip stream is being written, strm->adler is a crc32 instead of an adler32.
+   if the operating system was determined at compile time.  If a gzip stream is
   being written, strm->adler is a CRC-32 instead of an Adler-32.
     For raw deflate or gzip encoding, a request for a 256-byte window is
   rejected as invalid, since only the zlib header provides a means of
   transmitting the window size to the decompressor.
     The memLevel parameter specifies how much memory should be allocated
   for the internal compression state.  memLevel=1 uses minimum memory but is
@ -614,12 +638,12 @@ ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm,
   addition, the current implementation of deflate will use at most the window
   size minus 262 bytes of the provided dictionary.
-     Upon return of this function, strm->adler is set to the adler32 value
+     Upon return of this function, strm->adler is set to the Adler-32 value
   of the dictionary; the decompressor may later use this value to determine
-   which dictionary has been used by the compressor.  (The adler32 value
+   which dictionary has been used by the compressor.  (The Adler-32 value
   applies to the whole dictionary even if only a subset of the dictionary is
   actually used by the compressor.) If a raw deflate was requested, then the
-   adler32 value is not computed and strm->adler is not set.
+   Adler-32 value is not computed and strm->adler is not set.
     deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
   parameter is invalid (e.g.  dictionary being Z_NULL) or the stream state is
@ -628,6 +652,28 @@ ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm,
   not perform any compression: this will be done by deflate().
 */
 ZEXTERN int ZEXPORT deflateGetDictionary OF((z_streamp strm,
                                             Bytef *dictionary,
                                             uInt  *dictLength));
 /*
     Returns the sliding dictionary being maintained by deflate.  dictLength is
   set to the number of bytes in the dictionary, and that many bytes are copied
   to dictionary.  dictionary must have enough space, where 32768 bytes is
   always enough.  If deflateGetDictionary() is called with dictionary equal to
   Z_NULL, then only the dictionary length is returned, and nothing is copied.
   Similary, if dictLength is Z_NULL, then it is not set.
     deflateGetDictionary() may return a length less than the window size, even
   when more than the window size in input has been provided. It may return up
   to 258 bytes less in that case, due to how zlib's implementation of deflate
   manages the sliding window and lookahead for matches, where matches can be
   up to 258 bytes long. If the application needs the last window-size bytes of
   input, then that would need to be saved by the application outside of zlib.
     deflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the
   stream state is inconsistent.
 */
 ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest,
                                    z_streamp source));
 /*
@ -648,10 +694,10 @@ ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest,
 ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm));
 /*
-     This function is equivalent to deflateEnd followed by deflateInit,
+     This function is equivalent to deflateEnd followed by deflateInit, but
-   but does not free and reallocate all the internal compression state.  The
+   does not free and reallocate the internal compression state.  The stream
-   stream will keep the same compression level and any other attributes that
+   will leave the compression level and any other attributes that may have been
-   may have been set by deflateInit2.
+   set unchanged.
     deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
   stream state was inconsistent (such as zalloc or state being Z_NULL).
@ -662,20 +708,36 @@ ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm,
                                      int strategy));
 /*
     Dynamically update the compression level and compression strategy.  The
-   interpretation of level and strategy is as in deflateInit2.  This can be
+   interpretation of level and strategy is as in deflateInit2().  This can be
   used to switch between compression and straight copy of the input data, or
   to switch to a different kind of input data requiring a different strategy.
-   If the compression level is changed, the input available so far is
+   If the compression approach (which is a function of the level) or the
-   compressed with the old level (and may be flushed); the new level will take
+   strategy is changed, and if any input has been consumed in a previous
-   effect only at the next call of deflate().
+   deflate() call, then the input available so far is compressed with the old
   level and strategy using deflate(strm, Z_BLOCK).  There are three approaches
   for the compression levels 0, 1..3, and 4..9 respectively.  The new level
   and strategy will take effect at the next call of deflate().
-     Before the call of deflateParams, the stream state must be set as for
+     If a deflate(strm, Z_BLOCK) is performed by deflateParams(), and it does
-   a call of deflate(), since the currently available input may have to be
+   not have enough output space to complete, then the parameter change will not
-   compressed and flushed.  In particular, strm->avail_out must be non-zero.
+   take effect.  In this case, deflateParams() can be called again with the
   same parameters and more output space to try again.
-     deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source
+     In order to assure a change in the parameters on the first try, the
-   stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR if
+   deflate stream should be flushed using deflate() with Z_BLOCK or other flush
-   strm->avail_out was zero.
+   request until strm.avail_out is not zero, before calling deflateParams().
   Then no more input data should be provided before the deflateParams() call.
   If this is done, the old level and strategy will be applied to the data
   compressed before deflateParams(), and the new level and strategy will be
   applied to the the data compressed after deflateParams().
     deflateParams returns Z_OK on success, Z_STREAM_ERROR if the source stream
   state was inconsistent or if a parameter was invalid, or Z_BUF_ERROR if
   there was not enough output space to complete the compression of the
   available input data before a change in the strategy or approach.  Note that
   in the case of a Z_BUF_ERROR, the parameters are not changed.  A return
   value of Z_BUF_ERROR is not fatal, in which case deflateParams() can be
   retried with more output space.
 */
 ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm,
@ -793,7 +855,7 @@ ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
   is for use with other formats that use the deflate compressed data format
   such as zip.  Those formats provide their own check values.  If a custom
   format is developed using the raw deflate format for compressed data, it is
-   recommended that a check value such as an adler32 or a crc32 be applied to
+   recommended that a check value such as an Adler-32 or a CRC-32 be applied to
   the uncompressed data as is done in the zlib, gzip, and zip formats.  For
   most applications, the zlib format should be used as is.  Note that comments
   above on the use in deflateInit2() applies to the magnitude of windowBits.
@ -802,7 +864,10 @@ ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
   32 to windowBits to enable zlib and gzip decoding with automatic header
   detection, or add 16 to decode only the gzip format (the zlib format will
   return a Z_DATA_ERROR).  If a gzip stream is being decoded, strm->adler is a
-   crc32 instead of an adler32.
+   CRC-32 instead of an Adler-32.  Unlike the gunzip utility and gzread() (see
   below), inflate() will not automatically decode concatenated gzip streams.
   inflate() will return Z_STREAM_END at the end of the gzip stream.  The state
   would need to be reset to continue decoding a subsequent gzip stream.
     inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
@ -823,7 +888,7 @@ ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm,
     Initializes the decompression dictionary from the given uncompressed byte
   sequence.  This function must be called immediately after a call of inflate,
   if that call returned Z_NEED_DICT.  The dictionary chosen by the compressor
-   can be determined from the adler32 value returned by that call of inflate.
+   can be determined from the Adler-32 value returned by that call of inflate.
   The compressor and decompressor must use exactly the same dictionary (see
   deflateSetDictionary).  For raw inflate, this function can be called at any
   time to set the dictionary.  If the provided dictionary is smaller than the
@ -834,7 +899,7 @@ ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm,
     inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
   parameter is invalid (e.g.  dictionary being Z_NULL) or the stream state is
   inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
-   expected one (incorrect adler32 value).  inflateSetDictionary does not
+   expected one (incorrect Adler-32 value).  inflateSetDictionary does not
   perform any decompression: this will be done by subsequent calls of
   inflate().
 */
@ -892,7 +957,7 @@ ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest,
 ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm));
 /*
     This function is equivalent to inflateEnd followed by inflateInit,
-   but does not free and reallocate all the internal decompression state.  The
+   but does not free and reallocate the internal decompression state.  The
   stream will keep attributes that may have been set by inflateInit2.
     inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
@ -904,7 +969,9 @@ ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm,
 /*
     This function is the same as inflateReset, but it also permits changing
   the wrap and window size requests.  The windowBits parameter is interpreted
-   the same as it is for inflateInit2.
+   the same as it is for inflateInit2.  If the window size is changed, then the
   memory allocated for the window is freed, and the window will be reallocated
   by inflate() if needed.
     inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source
   stream state was inconsistent (such as zalloc or state being Z_NULL), or if
@ -956,7 +1023,7 @@ ZEXTERN long ZEXPORT inflateMark OF((z_streamp strm));
   location in the input stream can be determined from avail_in and data_type
   as noted in the description for the Z_BLOCK flush parameter for inflate.
-     inflateMark returns the value noted above or -1 << 16 if the provided
+     inflateMark returns the value noted above, or -65536 if the provided
   source stream state was inconsistent.
 */
@ -1048,9 +1115,9 @@ ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
   This routine would normally be used in a utility that reads zip or gzip
   files and writes out uncompressed files.  The utility would decode the
   header and process the trailer on its own, hence this routine expects only
-   the raw deflate stream to decompress.  This is different from the normal
+   the raw deflate stream to decompress.  This is different from the default
-   behavior of inflate(), which expects either a zlib or gzip header and
+   behavior of inflate(), which expects a zlib header and trailer around the
-   trailer around the deflate stream.
+   deflate stream.
     inflateBack() uses two subroutines supplied by the caller that are then
   called by inflateBack() for input and output.  inflateBack() calls those
@ -1060,11 +1127,11 @@ ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
   typedefs.  inflateBack() will call in(in_desc, &buf) which should return the
   number of bytes of provided input, and a pointer to that input in buf.  If
   there is no input available, in() must return zero -- buf is ignored in that
-   case--and inflateBack() will return a buffer error.  inflateBack() will call
+   case -- and inflateBack() will return a buffer error.  inflateBack() will
-   out(out_desc, buf, len) to write the uncompressed data buf[0..len-1].  out()
+   call out(out_desc, buf, len) to write the uncompressed data buf[0..len-1].
-   should return zero on success, or non-zero on failure.  If out() returns
+   out() should return zero on success, or non-zero on failure.  If out()
-   non-zero, inflateBack() will return with an error.  Neither in() nor out()
+   returns non-zero, inflateBack() will return with an error.  Neither in() nor
-   are permitted to change the contents of the window provided to
+   out() are permitted to change the contents of the window provided to
   inflateBackInit(), which is also the buffer that out() uses to write from.
   The length written by out() will be at most the window size.  Any non-zero
   amount of input may be provided by in().
@ -1114,7 +1181,7 @@ ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void));
     7.6: size of z_off_t
    Compiler, assembler, and debug options:
-     8: DEBUG
+     8: ZLIB_DEBUG
     9: ASMV or ASMINF -- use ASM code
     10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention
     11: 0 (reserved)
@ -1164,7 +1231,8 @@ ZEXTERN int ZEXPORT compress OF((Bytef *dest,   uLongf *destLen,
   the byte length of the source buffer.  Upon entry, destLen is the total size
   of the destination buffer, which must be at least the value returned by
   compressBound(sourceLen).  Upon exit, destLen is the actual size of the
-   compressed buffer.
+   compressed data.  compress() is equivalent to compress2() with a level
   parameter of Z_DEFAULT_COMPRESSION.
     compress returns Z_OK if success, Z_MEM_ERROR if there was not
   enough memory, Z_BUF_ERROR if there was not enough room in the output
@ -1180,7 +1248,7 @@ ZEXTERN int ZEXPORT compress2 OF((Bytef *dest,   uLongf *destLen,
   length of the source buffer.  Upon entry, destLen is the total size of the
   destination buffer, which must be at least the value returned by
   compressBound(sourceLen).  Upon exit, destLen is the actual size of the
-   compressed buffer.
+   compressed data.
     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
@ -1203,7 +1271,7 @@ ZEXTERN int ZEXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
   uncompressed data.  (The size of the uncompressed data must have been saved
   previously by the compressor and transmitted to the decompressor by some
   mechanism outside the scope of this compression library.) Upon exit, destLen
-   is the actual size of the uncompressed buffer.
+   is the actual size of the uncompressed data.
     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
   enough memory, Z_BUF_ERROR if there was not enough room in the output
@ -1212,6 +1280,14 @@ ZEXTERN int ZEXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
   buffer with the uncompressed data up to that point.
 */
 ZEXTERN int ZEXPORT uncompress2 OF((Bytef *dest,   uLongf *destLen,
                                    const Bytef *source, uLong *sourceLen));
 /*
     Same as uncompress, except that sourceLen is a pointer, where the
   length of the source is *sourceLen.  On return, *sourceLen is the number of
   source bytes consumed.
 */
                        /* gzip file access functions */
 /*
@ -1290,10 +1366,9 @@ ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size));
   default buffer size is 8192 bytes.  This function must be called after
   gzopen() or gzdopen(), and before any other calls that read or write the
   file.  The buffer memory allocation is always deferred to the first read or
-   write.  Two buffers are allocated, either both of the specified size when
+   write.  Three times that size in buffer space is allocated.  A larger buffer
-   writing, or one of the specified size and the other twice that size when
+   size of, for example, 64K or 128K bytes will noticeably increase the speed
-   reading.  A larger buffer size of, for example, 64K or 128K bytes will
+   of decompression (reading).
   noticeably increase the speed of decompression (reading).
     The new buffer size also affects the maximum length for gzprintf().
@ -1304,10 +1379,12 @@ ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size));
 ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
 /*
     Dynamically update the compression level or strategy.  See the description
-   of deflateInit2 for the meaning of these parameters.
+   of deflateInit2 for the meaning of these parameters.  Previously provided
   data is flushed before the parameter change.
-     gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not
+     gzsetparams returns Z_OK if success, Z_STREAM_ERROR if the file was not
-   opened for writing.
+   opened for writing, Z_ERRNO if there is an error writing the flushed data,
   or Z_MEM_ERROR if there is a memory allocation error.
 */
 ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));
@ -1335,7 +1412,35 @@ ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));
   case.
     gzread returns the number of uncompressed bytes actually read, less than
-   len for end of file, or -1 for error.
+   len for end of file, or -1 for error.  If len is too large to fit in an int,
   then nothing is read, -1 is returned, and the error state is set to
   Z_STREAM_ERROR.
 */
 ZEXTERN z_size_t ZEXPORT gzfread OF((voidp buf, z_size_t size, z_size_t nitems,
                                     gzFile file));
 /*
     Read up to nitems items of size size from file to buf, otherwise operating
   as gzread() does.  This duplicates the interface of stdio's fread(), with
   size_t request and return types.  If the library defines size_t, then
   z_size_t is identical to size_t.  If not, then z_size_t is an unsigned
   integer type that can contain a pointer.
     gzfread() returns the number of full items read of size size, or zero if
   the end of the file was reached and a full item could not be read, or if
   there was an error.  gzerror() must be consulted if zero is returned in
   order to determine if there was an error.  If the multiplication of size and
   nitems overflows, i.e. the product does not fit in a z_size_t, then nothing
   is read, zero is returned, and the error state is set to Z_STREAM_ERROR.
     In the event that the end of file is reached and only a partial item is
   available at the end, i.e. the remaining uncompressed data length is not a
   multiple of size, then the final partial item is nevetheless read into buf
   and the end-of-file flag is set.  The length of the partial item read is not
   provided, but could be inferred from the result of gztell().  This behavior
   is the same as the behavior of fread() implementations in common libraries,
   but it prevents the direct use of gzfread() to read a concurrently written
   file, reseting and retrying on end-of-file, when size is not 1.
 */
 ZEXTERN int ZEXPORT gzwrite OF((gzFile file,
@ -1346,19 +1451,33 @@ ZEXTERN int ZEXPORT gzwrite OF((gzFile file,
   error.
 */
 ZEXTERN z_size_t ZEXPORT gzfwrite OF((voidpc buf, z_size_t size,
                                      z_size_t nitems, gzFile file));
 /*
     gzfwrite() writes nitems items of size size from buf to file, duplicating
   the interface of stdio's fwrite(), with size_t request and return types.  If
   the library defines size_t, then z_size_t is identical to size_t.  If not,
   then z_size_t is an unsigned integer type that can contain a pointer.
     gzfwrite() returns the number of full items written of size size, or zero
   if there was an error.  If the multiplication of size and nitems overflows,
   i.e. the product does not fit in a z_size_t, then nothing is written, zero
   is returned, and the error state is set to Z_STREAM_ERROR.
 */
 ZEXTERN int ZEXPORTVA gzprintf Z_ARG((gzFile file, const char *format, ...));
 /*
     Converts, formats, and writes the arguments to the compressed file under
   control of the format string, as in fprintf.  gzprintf returns the number of
-   uncompressed bytes actually written, or 0 in case of error.  The number of
+   uncompressed bytes actually written, or a negative zlib error code in case
-   uncompressed bytes written is limited to 8191, or one less than the buffer
+   of error.  The number of uncompressed bytes written is limited to 8191, or
-   size given to gzbuffer().  The caller should assure that this limit is not
+   one less than the buffer size given to gzbuffer().  The caller should assure
-   exceeded.  If it is exceeded, then gzprintf() will return an error (0) with
+   that this limit is not exceeded.  If it is exceeded, then gzprintf() will
-   nothing written.  In this case, there may also be a buffer overflow with
+   return an error (0) with nothing written.  In this case, there may also be a
-   unpredictable consequences, which is possible only if zlib was compiled with
+   buffer overflow with unpredictable consequences, which is possible only if
-   the insecure functions sprintf() or vsprintf() because the secure snprintf()
+   zlib was compiled with the insecure functions sprintf() or vsprintf()
-   or vsnprintf() functions were not available.  This can be determined using
+   because the secure snprintf() or vsnprintf() functions were not available.
-   zlibCompileFlags().
+   This can be determined using zlibCompileFlags().
 */
 ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));
@ -1418,7 +1537,7 @@ ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));
     If the flush parameter is Z_FINISH, the remaining data is written and the
   gzip stream is completed in the output.  If gzwrite() is called again, a new
   gzip stream will be started in the output.  gzread() is able to read such
-   concatented gzip streams.
+   concatenated gzip streams.
     gzflush should be called only when strictly necessary because it will
   degrade compression if called too often.
@ -1572,7 +1691,7 @@ ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
   return the updated checksum.  If buf is Z_NULL, this function returns the
   required initial value for the checksum.
-     An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
+     An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed
   much faster.
   Usage example:
@ -1585,6 +1704,12 @@ ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
     if (adler != original_adler) error();
 */
 ZEXTERN uLong ZEXPORT adler32_z OF((uLong adler, const Bytef *buf,
                                    z_size_t len));
 /*
     Same as adler32(), but with a size_t length.
 */
 /*
 ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
                                          z_off_t len2));
@ -1614,6 +1739,12 @@ ZEXTERN uLong ZEXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
     if (crc != original_crc) error();
 */
 ZEXTERN uLong ZEXPORT crc32_z OF((uLong adler, const Bytef *buf,
                                  z_size_t len));
 /*
     Same as crc32(), but with a size_t length.
 */
 /*
 ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2));
@ -1644,6 +1775,21 @@ ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
                                         unsigned char FAR *window,
                                         const char *version,
                                         int stream_size));
 #ifdef Z_PREFIX_SET
 #  define z_deflateInit(strm, level) \
          deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream))
 #  define z_inflateInit(strm) \
          inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream))
 #  define z_deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
          deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
                        (strategy), ZLIB_VERSION, (int)sizeof(z_stream))
 #  define z_inflateInit2(strm, windowBits) \
          inflateInit2_((strm), (windowBits), ZLIB_VERSION, \
                        (int)sizeof(z_stream))
 #  define z_inflateBackInit(strm, windowBits, window) \
          inflateBackInit_((strm), (windowBits), (window), \
                           ZLIB_VERSION, (int)sizeof(z_stream))
 #else
 #  define deflateInit(strm, level) \
          deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream))
 #  define inflateInit(strm) \
@ -1657,6 +1803,7 @@ ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
 #  define inflateBackInit(strm, windowBits, window) \
          inflateBackInit_((strm), (windowBits), (window), \
                           ZLIB_VERSION, (int)sizeof(z_stream))
 #endif
 #ifndef Z_SOLO
@ -1676,10 +1823,10 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
 #ifdef Z_PREFIX_SET
 #  undef z_gzgetc
 #  define z_gzgetc(g) \
-          ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : gzgetc(g))
+          ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g))
 #else
 #  define gzgetc(g) \
-          ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : gzgetc(g))
+          ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g))
 #endif
 /* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or
@ -1737,19 +1884,16 @@ ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
 #endif /* !Z_SOLO */
 /* hack for buggy compilers */
 #if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL)
    struct internal_state {int dummy;};
 #endif
 /* undocumented functions */
 ZEXTERN const char   * ZEXPORT zError           OF((int));
 ZEXTERN int            ZEXPORT inflateSyncPoint OF((z_streamp));
 ZEXTERN const z_crc_t FAR * ZEXPORT get_crc_table    OF((void));
 ZEXTERN int            ZEXPORT inflateUndermine OF((z_streamp, int));
 ZEXTERN int            ZEXPORT inflateValidate OF((z_streamp, int));
 ZEXTERN unsigned long  ZEXPORT inflateCodesUsed OF ((z_streamp));
 ZEXTERN int            ZEXPORT inflateResetKeep OF((z_streamp));
 ZEXTERN int            ZEXPORT deflateResetKeep OF((z_streamp));
-#if defined(_WIN32) && !defined(Z_SOLO)
+#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(Z_SOLO)
 ZEXTERN gzFile         ZEXPORT gzopen_w OF((const wchar_t *path,
                                            const char *mode));
 #endif
--- a/zlib/zutil.c
+++ b/zlib/zutil.c
@ -1,5 +1,5 @@
 /* zutil.c -- target dependent utility functions for the compression library
- * Copyright (C) 1995-2005, 2010, 2011, 2012 Jean-loup Gailly.
+ * Copyright (C) 1995-2017 Jean-loup Gailly
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -10,21 +10,18 @@
 #  include "gzguts.h"
 #endif
 #ifndef NO_DUMMY_DECL
 struct internal_state      {int dummy;}; /* for buggy compilers */
 #endif
 z_const char * const z_errmsg[10] = {
-"need dictionary",     /* Z_NEED_DICT       2  */
+    (z_const char *)"need dictionary",     /* Z_NEED_DICT       2  */
-"stream end",          /* Z_STREAM_END      1  */
+    (z_const char *)"stream end",          /* Z_STREAM_END      1  */
-"",                    /* Z_OK              0  */
+    (z_const char *)"",                    /* Z_OK              0  */
-"file error",          /* Z_ERRNO         (-1) */
+    (z_const char *)"file error",          /* Z_ERRNO         (-1) */
-"stream error",        /* Z_STREAM_ERROR  (-2) */
+    (z_const char *)"stream error",        /* Z_STREAM_ERROR  (-2) */
-"data error",          /* Z_DATA_ERROR    (-3) */
+    (z_const char *)"data error",          /* Z_DATA_ERROR    (-3) */
-"insufficient memory", /* Z_MEM_ERROR     (-4) */
+    (z_const char *)"insufficient memory", /* Z_MEM_ERROR     (-4) */
-"buffer error",        /* Z_BUF_ERROR     (-5) */
+    (z_const char *)"buffer error",        /* Z_BUF_ERROR     (-5) */
-"incompatible version",/* Z_VERSION_ERROR (-6) */
+    (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
-""};
+    (z_const char *)""
 };
 const char * ZEXPORT zlibVersion()
@ -61,7 +58,7 @@ uLong ZEXPORT zlibCompileFlags()
    case 8:     flags += 2 << 6;        break;
    default:    flags += 3 << 6;
    }
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
    flags += 1 << 8;
 #endif
 #if defined(ASMV) || defined(ASMINF)
@ -115,8 +112,8 @@ uLong ZEXPORT zlibCompileFlags()
    return flags;
 }
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
-
+#include <stdlib.h>
 #  ifndef verbose
 #    define verbose 0
 #  endif
@ -219,9 +216,11 @@ local ptr_table table[MAX_PTR];
 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
 {
-    voidpf buf = opaque; /* just to make some compilers happy */
+    voidpf buf;
    ulg bsize = (ulg)items*size;
    (void)opaque;
    /* If we allocate less than 65520 bytes, we assume that farmalloc
     * will return a usable pointer which doesn't have to be normalized.
     */
@ -244,6 +243,9 @@ voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
 {
    int n;
    (void)opaque;
    if (*(ush*)&ptr != 0) { /* object < 64K */
        farfree(ptr);
        return;
@ -259,7 +261,6 @@ void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
        next_ptr--;
        return;
    }
    ptr = opaque; /* just to make some compilers happy */
    Assert(0, "zcfree: ptr not found");
 }
@ -278,13 +279,13 @@ void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
 {
-    if (opaque) opaque = 0; /* to make compiler happy */
+    (void)opaque;
    return _halloc((long)items, size);
 }
 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
 {
-    if (opaque) opaque = 0; /* to make compiler happy */
+    (void)opaque;
    _hfree(ptr);
 }
@ -306,7 +307,7 @@ voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
    unsigned items;
    unsigned size;
 {
-    if (opaque) items += size - size; /* make compiler happy */
+    (void)opaque;
    return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
                              (voidpf)calloc(items, size);
 }
@ -315,8 +316,8 @@ void ZLIB_INTERNAL zcfree (opaque, ptr)
    voidpf opaque;
    voidpf ptr;
 {
    (void)opaque;
    free(ptr);
    if (opaque) return; /* make compiler happy */
 }
 #endif /* MY_ZCALLOC */
--- a/zlib/zutil.h
+++ b/zlib/zutil.h
@ -1,5 +1,5 @@
 /* zutil.h -- internal interface and configuration of the compression library
- * Copyright (C) 1995-2013 Jean-loup Gailly.
+ * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@ -36,7 +36,9 @@
 #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) */
 typedef unsigned char  uch;
 typedef uch FAR uchf;
@ -98,28 +100,38 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 #endif
 #ifdef AMIGA
-#  define OS_CODE  0x01
+#  define OS_CODE  1
 #endif
 #if defined(VAXC) || defined(VMS)
-#  define OS_CODE  0x02
+#  define OS_CODE  2
 #  define F_OPEN(name, mode) \
     fopen((name), (mode), "mbc=60", "ctx=stm", "rfm=fix", "mrs=512")
 #endif
 #ifdef __370__
 #  if __TARGET_LIB__ < 0x20000000
 #    define OS_CODE 4
 #  elif __TARGET_LIB__ < 0x40000000
 #    define OS_CODE 11
 #  else
 #    define OS_CODE 8
 #  endif
 #endif
 #if defined(ATARI) || defined(atarist)
-#  define OS_CODE  0x05
+#  define OS_CODE  5
 #endif
 #ifdef OS2
-#  define OS_CODE  0x06
+#  define OS_CODE  6
 #  if defined(M_I86) && !defined(Z_SOLO)
 #    include <malloc.h>
 #  endif
 #endif
 #if defined(MACOS) || defined(TARGET_OS_MAC)
-#  define OS_CODE  0x07
+#  define OS_CODE  7
 #  ifndef Z_SOLO
 #    if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
 #      include <unix.h> /* for fdopen */
@ -131,18 +143,24 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 #  endif
 #endif
-#ifdef TOPS20
+#ifdef __acorn
-#  define OS_CODE  0x0a
+#  define OS_CODE 13
 #endif
-#ifdef WIN32
+#if defined(WIN32) && !defined(__CYGWIN__)
-#  ifndef __CYGWIN__  /* Cygwin is Unix, not Win32 */
+#  define OS_CODE  10
 #    define OS_CODE  0x0b
 #  endif
 #endif
-#ifdef __50SERIES /* Prime/PRIMOS */
+#ifdef _BEOS_
-#  define OS_CODE  0x0f
+#  define OS_CODE  16
 #endif
 #ifdef __TOS_OS400__
 #  define OS_CODE 18
 #endif
 #ifdef __APPLE__
 #  define OS_CODE 19
 #endif
 #if defined(_BEOS_) || defined(RISCOS)
@ -177,7 +195,7 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
        /* common defaults */
 #ifndef OS_CODE
-#  define OS_CODE  0x03  /* assume Unix */
+#  define OS_CODE  3     /* assume Unix */
 #endif
 #ifndef F_OPEN
@ -216,7 +234,7 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 #endif
 /* Diagnostic functions */
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
 #  include <stdio.h>
   extern int ZLIB_INTERNAL z_verbose;
   extern void ZLIB_INTERNAL z_error OF((char *m));