text: /* gzguts.h -- zlib internal header definitions for gz* operations
   * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
   * For conditions of distribution and use, see copyright notice in zlib.h
   */
  
  #ifdef _LARGEFILE64_SOURCE
  #  ifndef _LARGEFILE_SOURCE
  #    define _LARGEFILE_SOURCE 1
  #  endif
  #  ifdef _FILE_OFFSET_BITS
  #    undef _FILE_OFFSET_BITS
  #  endif
  #endif
  
  #ifdef HAVE_HIDDEN
  #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
  #else
  #  define ZLIB_INTERNAL
  #endif
  
  #include <stdio.h>
  #include "zlib.h"
  #ifdef STDC
  #  include <string.h>
  #  include <stdlib.h>
  #  include <limits.h>
  #endif
  #  include <unistd.h> // !!!!! Added for compilation of js_ReaScriptAPI on Appveyor for Apple ARM
  
  #ifndef _POSIX_SOURCE
  #  define _POSIX_SOURCE
  #endif
  #include <fcntl.h>
  
  #ifdef _WIN32
  #  include <stddef.h>
  #endif
  
  #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
  #  include <io.h>
  #endif
  
  #if defined(_WIN32) || defined(__CYGWIN__)
  #  define WIDECHAR
  #endif
  
  #ifdef WINAPI_FAMILY
  #  define open _open
  #  define read _read
  #  define write _write
  #  define close _close
  #endif
  
  #ifdef NO_DEFLATE       /* for compatibility with old definition */
  #  define NO_GZCOMPRESS
  #endif
  
  #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
  #  ifndef HAVE_VSNPRINTF
  #    define HAVE_VSNPRINTF
  #  endif
  #endif
  
  #if defined(__CYGWIN__)
  #  ifndef HAVE_VSNPRINTF
  #    define HAVE_VSNPRINTF
  #  endif
  #endif
  
  #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
  #  ifndef HAVE_VSNPRINTF
  #    define HAVE_VSNPRINTF
  #  endif
  #endif
  
  #ifndef HAVE_VSNPRINTF
  #  ifdef MSDOS
  /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
     but for now we just assume it doesn't. */
  #    define NO_vsnprintf
  #  endif
  #  ifdef __TURBOC__
  #    define NO_vsnprintf
  #  endif
  #  ifdef WIN32
  /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
  #    if !defined(vsnprintf) && !defined(NO_vsnprintf)
  #      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
  #         define vsnprintf _vsnprintf
  #      endif
  #    endif
  #  endif
  #  ifdef __SASC
  #    define NO_vsnprintf
  #  endif
  #  ifdef VMS
  #    define NO_vsnprintf
  #  endif
  #  ifdef __OS400__
  #    define NO_vsnprintf
  #  endif
  #  ifdef __MVS__
  #    define NO_vsnprintf
  #  endif
  #endif
  
  /* unlike snprintf (which is required in C99), _snprintf does not guarantee
     null termination of the result -- however this is only used in gzlib.c where
     the result is assured to fit in the space provided */
  #if defined(_MSC_VER) && _MSC_VER < 1900
  #  define snprintf _snprintf
  #endif
  
  #ifndef local
  #  define local static
  #endif
  /* since "static" is used to mean two completely different things in C, we
     define "local" for the non-static meaning of "static", for readability
     (compile with -Dlocal if your debugger can't find static symbols) */
  
  /* gz* functions always use library allocation functions */
  #ifndef STDC
    extern voidp  malloc OF((uInt size));
    extern void   free   OF((voidpf ptr));
  #endif
  
  /* get errno and strerror definition */
  #if defined UNDER_CE
  #  include <windows.h>
  #  define zstrerror() gz_strwinerror((DWORD)GetLastError())
  #else
  #  ifndef NO_STRERROR
  #    include <errno.h>
  #    define zstrerror() strerror(errno)
  #  else
  #    define zstrerror() "stdio error (consult errno)"
  #  endif
  #endif
  
  /* provide prototypes for these when building zlib without LFS */
  #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
      ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
      ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
      ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
      ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
  #endif
  
  /* default memLevel */
  #if MAX_MEM_LEVEL >= 8
  #  define DEF_MEM_LEVEL 8
  #else
  #  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
  #endif
  
  /* default i/o buffer size -- double this for output when reading (this and
     twice this must be able to fit in an unsigned type) */
  #define GZBUFSIZE 8192
  
  /* gzip modes, also provide a little integrity check on the passed structure */
  #define GZ_NONE 0
  #define GZ_READ 7247
  #define GZ_WRITE 31153
  #define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
  
  /* values for gz_state how */
  #define LOOK 0      /* look for a gzip header */
  #define COPY 1      /* copy input directly */
  #define GZIP 2      /* decompress a gzip stream */
  
  /* internal gzip file state data structure */
  typedef struct {
          /* exposed contents for gzgetc() macro */
      struct gzFile_s x;      /* "x" for exposed */
                              /* x.have: number of bytes available at x.next */
                              /* x.next: next output data to deliver or write */
                              /* x.pos: current position in uncompressed data */
          /* used for both reading and writing */
      int mode;               /* see gzip modes above */
      int fd;                 /* file descriptor */
      char *path;             /* path or fd for error messages */
      unsigned size;          /* buffer size, zero if not allocated yet */
      unsigned want;          /* requested buffer size, default is GZBUFSIZE */
      unsigned char *in;      /* input buffer (double-sized when writing) */
      unsigned char *out;     /* output buffer (double-sized when reading) */
      int direct;             /* 0 if processing gzip, 1 if transparent */
          /* just for reading */
      int how;                /* 0: get header, 1: copy, 2: decompress */
      z_off64_t start;        /* where the gzip data started, for rewinding */
      int eof;                /* true if end of input file reached */
      int past;               /* true if read requested past end */
          /* just for writing */
      int level;              /* compression level */
      int strategy;           /* compression strategy */
          /* seek request */
      z_off64_t skip;         /* amount to skip (already rewound if backwards) */
      int seek;               /* true if seek request pending */
          /* error information */
      int err;                /* error code */
      char *msg;              /* error message */
          /* zlib inflate or deflate stream */
      z_stream strm;          /* stream structure in-place (not a pointer) */
  } gz_state;
  typedef gz_state FAR *gz_statep;
  
  /* shared functions */
  void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
  #if defined UNDER_CE
  char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
  #endif
  
  /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
     value -- needed when comparing unsigned to z_off64_t, which is signed
     (possible z_off64_t types off_t, off64_t, and long are all signed) */
  #ifdef INT_MAX
  #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
  #else
  unsigned ZLIB_INTERNAL gz_intmax OF((void));
  #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
  #endif
  