Various hacks, don’t look :) | zlib Documentation

various hacks, don't look :)

 deflateInit and inflateInit are macros to allow checking the zlib version
 and the compiler's view of z_stream:
 

deflateInit_


ZEXTERN int ZEXPORT deflateInit_(z_streamp strm, int level,
                                 const char *version, int stream_size);
ZEXTERN int ZEXPORT inflateInit_(z_streamp strm,
                                 const char *version, int stream_size);
ZEXTERN int ZEXPORT deflateInit2_(z_streamp strm, int  level, int  method,
                                  int windowBits, int memLevel,
                                  int strategy, const char *version,
                                  int stream_size);
ZEXTERN int ZEXPORT inflateInit2_(z_streamp strm, int  windowBits,
                                  const char *version, int stream_size);
ZEXTERN int ZEXPORT inflateBackInit_(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) \
          inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream))
#  define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
          deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
                        (strategy), ZLIB_VERSION, (int)sizeof(z_stream))
#  define inflateInit2(strm, windowBits) \
          inflateInit2_((strm), (windowBits), ZLIB_VERSION, \
                        (int)sizeof(z_stream))
#  define inflateBackInit(strm, windowBits, window) \
          inflateBackInit_((strm), (windowBits), (window), \
                           ZLIB_VERSION, (int)sizeof(z_stream))
#endif

#ifndef Z_SOLO

 gzgetc() macro and its supporting function and exposed data structure.  Note
 that the real internal state is much larger than the exposed structure.
 This abbreviated structure exposes just enough for the gzgetc() macro.  The
 user should not mess with these exposed elements, since their names or
 behavior could change in the future, perhaps even capriciously.  They can
 only be used by the gzgetc() macro.  You have been warned.
 

gzgetc_


struct gzFile_s {
    unsigned have;
    unsigned char *next;
    z_off64_t pos;
};
ZEXTERN int ZEXPORT gzgetc_(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))
#else
#  define gzgetc(g) \
          ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g))
#endif

 provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or
 change the regular functions to 64 bits if _FILE_OFFSET_BITS is 64 (if
 both are true, the application gets the *64 functions, and the regular
 functions are changed to 64 bits) -- in case these are set on systems
 without large file support, _LFS64_LARGEFILE must also be true
 

gzopen64


#ifdef Z_LARGE64
   ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *);
   ZEXTERN z_off64_t ZEXPORT gzseek64(gzFile, z_off64_t, int);
   ZEXTERN z_off64_t ZEXPORT gztell64(gzFile);
   ZEXTERN z_off64_t ZEXPORT gzoffset64(gzFile);
   ZEXTERN uLong ZEXPORT adler32_combine64(uLong, uLong, z_off64_t);
   ZEXTERN uLong ZEXPORT crc32_combine64(uLong, uLong, z_off64_t);
   ZEXTERN uLong ZEXPORT crc32_combine_gen64(z_off64_t);
#endif

#if !defined(ZLIB_INTERNAL) && defined(Z_WANT64)
#  ifdef Z_PREFIX_SET
#    define z_gzopen z_gzopen64
#    define z_gzseek z_gzseek64
#    define z_gztell z_gztell64
#    define z_gzoffset z_gzoffset64
#    define z_adler32_combine z_adler32_combine64
#    define z_crc32_combine z_crc32_combine64
#    define z_crc32_combine_gen z_crc32_combine_gen64
#  else
#    define gzopen gzopen64
#    define gzseek gzseek64
#    define gztell gztell64
#    define gzoffset gzoffset64
#    define adler32_combine adler32_combine64
#    define crc32_combine crc32_combine64
#    define crc32_combine_gen crc32_combine_gen64
#  endif
#  ifndef Z_LARGE64
     ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *);
     ZEXTERN z_off_t ZEXPORT gzseek64(gzFile, z_off_t, int);
     ZEXTERN z_off_t ZEXPORT gztell64(gzFile);
     ZEXTERN z_off_t ZEXPORT gzoffset64(gzFile);
     ZEXTERN uLong ZEXPORT adler32_combine64(uLong, uLong, z_off64_t);
     ZEXTERN uLong ZEXPORT crc32_combine64(uLong, uLong, z_off64_t);
     ZEXTERN uLong ZEXPORT crc32_combine_gen64(z_off64_t);
#  endif
#else
   ZEXTERN gzFile ZEXPORT gzopen(const char *, const char *);
   ZEXTERN z_off_t ZEXPORT gzseek(gzFile, z_off_t, int);
   ZEXTERN z_off_t ZEXPORT gztell(gzFile);
   ZEXTERN z_off_t ZEXPORT gzoffset(gzFile);
   ZEXTERN uLong ZEXPORT adler32_combine(uLong, uLong, z_off_t);
   ZEXTERN uLong ZEXPORT crc32_combine(uLong, uLong, z_off_t);
   ZEXTERN uLong ZEXPORT crc32_combine_gen(z_off_t);
#endif

#else /* Z_SOLO */

   ZEXTERN uLong ZEXPORT adler32_combine(uLong, uLong, z_off_t);
   ZEXTERN uLong ZEXPORT crc32_combine(uLong, uLong, z_off_t);
   ZEXTERN uLong ZEXPORT crc32_combine_gen(z_off_t);

#endif /* !Z_SOLO */