    /* zutil.h -- internal interface and configuration of the compression library
     * Copyright (C) 1995-2013 Jean-loup Gailly.
     * For conditions of distribution and use, see copyright notice in zlib.h
     */

    /* WARNING: this file should *not* be used by applications. It is
       part of the implementation of the compression library and is
       subject to change. Applications should only use zlib.h.
     */

    /* @(#) $Id$ */

    #ifndef ZUTIL_H
    #define ZUTIL_H

    #ifdef HAVE_HIDDEN
    #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
    #else
    #  define ZLIB_INTERNAL
    #endif

    #include "zlib.h"

    #if defined(STDC) && !defined(Z_SOLO)
    #  if !(defined(_WIN32_WCE) && defined(_MSC_VER))
    #    include <stddef.h>
    #  endif
    #  include <string.h>
    #  include <stdlib.h>
    #endif

    #ifdef Z_SOLO
       typedef long ptrdiff_t;  /* guess -- will be caught if guess is wrong */
    #endif

    #ifndef local
    #  define local static
    #endif
    /* compile with -Dlocal if your debugger can't find static symbols */

    typedef unsigned char  uch;
    typedef uch FAR uchf;
    typedef unsigned short ush;
    typedef ush FAR ushf;
    typedef unsigned long  ulg;

    extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
    /* (size given to avoid silly warnings with Visual C++) */

    #define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]

    #define ERR_RETURN(strm,err) \
      return (strm->msg = ERR_MSG(err), (err))
    /* To be used only when the state is known to be valid */

            /* common constants */

    #ifndef DEF_WBITS
    #  define DEF_WBITS MAX_WBITS
    #endif
    /* default windowBits for decompression. MAX_WBITS is for compression only */

    #if MAX_MEM_LEVEL >= 8
    #  define DEF_MEM_LEVEL 8
    #else
    #  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
    #endif
    /* default memLevel */

    #define STORED_BLOCK 0
    #define STATIC_TREES 1
    #define DYN_TREES    2
    /* The three kinds of block type */

    #define MIN_MATCH  3
    #define MAX_MATCH  258
    /* The minimum and maximum match lengths */

    #define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */

            /* target dependencies */

    #if defined(MSDOS) || (defined(WINDOWS) && !defined(WIN32))
    #  define OS_CODE  0x00
    #  ifndef Z_SOLO
    #    if defined(__TURBOC__) || defined(__BORLANDC__)
    #      if (__STDC__ == 1) && (defined(__LARGE__) || defined(__COMPACT__))
             /* Allow compilation with ANSI keywords only enabled */
             void _Cdecl farfree( void *block );
             void *_Cdecl farmalloc( unsigned long nbytes );
    #      else
    #        include <alloc.h>
    #      endif
    #    else /* MSC or DJGPP */
    #      include <malloc.h>
    #    endif
    #  endif
    #endif

    #ifdef AMIGA
    #  define OS_CODE  0x01
    #endif

    #if defined(VAXC) || defined(VMS)
    #  define OS_CODE  0x02
    #  define F_OPEN(name, mode) \
         fopen((name), (mode), "mbc=60", "ctx=stm", "rfm=fix", "mrs=512")
    #endif

    #if defined(ATARI) || defined(atarist)
    #  define OS_CODE  0x05
    #endif

    #ifdef OS2
    #  define OS_CODE  0x06
    #  if defined(M_I86) && !defined(Z_SOLO)
    #    include <malloc.h>
    #  endif
    #endif

    #if defined(MACOS) || defined(TARGET_OS_MAC)
    #  define OS_CODE  0x07
    #  ifndef Z_SOLO
    #    if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
    #      include <unix.h> /* for fdopen */
    #    else
    #      ifndef fdopen
    #        define fdopen(fd,mode) NULL /* No fdopen() */
    #      endif
    #    endif
    #  endif
    #endif

    #ifdef TOPS20
    #  define OS_CODE  0x0a
    #endif

    #ifdef WIN32
    #  ifndef __CYGWIN__  /* Cygwin is Unix, not Win32 */
    #    define OS_CODE  0x0b
    #  endif
    #endif

    #ifdef __50SERIES /* Prime/PRIMOS */
    #  define OS_CODE  0x0f
    #endif

    #if defined(_BEOS_) || defined(RISCOS)
    #  define fdopen(fd,mode) NULL /* No fdopen() */
    #endif

    #if (defined(_MSC_VER) && (_MSC_VER > 600)) && !defined __INTERIX
    #  if defined(_WIN32_WCE)
    #    define fdopen(fd,mode) NULL /* No fdopen() */
    #    ifndef _PTRDIFF_T_DEFINED
           typedef int ptrdiff_t;
    #      define _PTRDIFF_T_DEFINED
    #    endif
    #  else
    #    define fdopen(fd,type)  _fdopen(fd,type)
    #  endif
    #endif

    #if defined(__BORLANDC__) && !defined(MSDOS)
      #pragma warn -8004
      #pragma warn -8008
      #pragma warn -8066
    #endif

    /* provide prototypes for these when building zlib without LFS */
    #if !defined(_WIN32) && \
        (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
        ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
        ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
    #endif

            /* common defaults */

    #ifndef OS_CODE
    #  define OS_CODE  0x03  /* assume Unix */
    #endif

    #ifndef F_OPEN
    #  define F_OPEN(name, mode) fopen((name), (mode))
    #endif

             /* functions */

    #if defined(pyr) || defined(Z_SOLO)
    #  define NO_MEMCPY
    #endif
    #if defined(SMALL_MEDIUM) && !defined(_MSC_VER) && !defined(__SC__)
     /* Use our own functions for small and medium model with MSC <= 5.0.
      * You may have to use the same strategy for Borland C (untested).
      * The __SC__ check is for Symantec.
      */
    #  define NO_MEMCPY
    #endif
    #if defined(STDC) && !defined(HAVE_MEMCPY) && !defined(NO_MEMCPY)
    #  define HAVE_MEMCPY
    #endif
    #ifdef HAVE_MEMCPY
    #  ifdef SMALL_MEDIUM /* MSDOS small or medium model */
    #    define zmemcpy _fmemcpy
    #    define zmemcmp _fmemcmp
    #    define zmemzero(dest, len) _fmemset(dest, 0, len)
    #  else
    #    define zmemcpy memcpy
    #    define zmemcmp memcmp
    #    define zmemzero(dest, len) memset(dest, 0, len)
    #  endif
    #else
       void ZLIB_INTERNAL zmemcpy OF((Bytef* dest, const Bytef* source, uInt len));
       int ZLIB_INTERNAL zmemcmp OF((const Bytef* s1, const Bytef* s2, uInt len));
       void ZLIB_INTERNAL zmemzero OF((Bytef* dest, uInt len));
    #endif

    /* Diagnostic functions */
    #ifdef DEBUG
    #  include <stdio.h>
       extern int ZLIB_INTERNAL z_verbose;
       extern void ZLIB_INTERNAL z_error OF((char *m));
    #  define Assert(cond,msg) {if(!(cond)) z_error(msg);}
    #  define Trace(x) {if (z_verbose>=0) fprintf x ;}
    #  define Tracev(x) {if (z_verbose>0) fprintf x ;}
    #  define Tracevv(x) {if (z_verbose>1) fprintf x ;}
    #  define Tracec(c,x) {if (z_verbose>0 && (c)) fprintf x ;}
    #  define Tracecv(c,x) {if (z_verbose>1 && (c)) fprintf x ;}
    #else
    #  define Assert(cond,msg)
    #  define Trace(x)
    #  define Tracev(x)
    #  define Tracevv(x)
    #  define Tracec(c,x)
    #  define Tracecv(c,x)
    #endif

    #ifndef Z_SOLO
       voidpf ZLIB_INTERNAL zcalloc OF((voidpf opaque, unsigned items,
                                        unsigned size));
       void ZLIB_INTERNAL zcfree  OF((voidpf opaque, voidpf ptr));
    #endif

    #define ZALLOC(strm, items, size) \
               (*((strm)->zalloc))((strm)->opaque, (items), (size))
    #define ZFREE(strm, addr)  (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
    #define TRY_FREE(s, p) {if (p) ZFREE(s, p);}

    /* Reverse the bytes in a 32-bit value */
    #define ZSWAP32(q) ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
                        (((q) & 0xff00) << 8) + (((q) & 0xff) << 24))

    #endif /* ZUTIL_H */