Fossil

/* zlib.h -- interface of the 'zlib' general purpose compression library
  version 1.2.12, March 11th, 2022

  Copyright (C) 1995-2022 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
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it

#include "zconf.h"

#ifdef __cplusplus
extern "C" {
#endif

#define ZLIB_VERSION "1.2.12"
#define ZLIB_VERNUM 0x12c0
#define ZLIB_VER_MAJOR 1
#define ZLIB_VER_MINOR 2
#define ZLIB_VER_REVISION 12
#define ZLIB_VER_SUBREVISION 0

/*
    The 'zlib' compression library provides in-memory compression and
  decompression functions, including integrity checks of the uncompressed data.
  This version of the library supports only one compression method (deflation)
  but other algorithms will be added later and will have the same stream

                                     int  level,
                                     int  method,
                                     int  windowBits,
                                     int  memLevel,
                                     int  strategy));

     This is another version of deflateInit with more compression options.  The
   fields zalloc, zfree and opaque must be initialized before by the caller.


     The method parameter is the compression method.  It must be Z_DEFLATED in
   this version of the library.

     The windowBits parameter is the base two logarithm of the window size
   (the size of the history buffer).  It should be in the range 8..15 for this
   version of the library.  Larger values of this parameter result in better

                                      int strategy));
/*
     Dynamically update the compression level and compression strategy.  The
   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 approach (which is a function of the level) or the
   strategy is changed, and if there have been any deflate() calls since the
   state was initialized or reset, 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().

     If a deflate(strm, Z_BLOCK) is performed by deflateParams(), and it does
   not have enough output space to complete, then the parameter change will not
   take effect.  In this case, deflateParams() can be called again with the
   same parameters and more output space to try again.

     In order to assure a change in the parameters on the first try, the

   above on the use in deflateInit2() applies to the magnitude of windowBits.

     windowBits can also be greater than 15 for optional gzip decoding.  Add
   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
   CRC-32 instead of an Adler-32.  Unlike the gunzip utility and gzread() (see
   below), inflate() will *not* automatically decode concatenated gzip members.
   inflate() will return Z_STREAM_END at the end of the gzip member.  The state
   would need to be reset to continue decoding a subsequent gzip member.  This
   *must* be done if there is more data after a gzip member, in order for the
   decompression to be compliant with the gzip standard (RFC 1952).

     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
   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.  inflateInit2 does not perform any decompression
   apart from possibly reading the zlib header if present: actual decompression

*/

typedef struct gzFile_s *gzFile;    /* semi-opaque gzip file descriptor */

/*
ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode));

     Open the gzip (.gz) file at path for reading and decompressing, or
   compressing and writing.  The mode parameter is as in fopen ("rb" or "wb")
   but can also include a compression level ("wb9") or a strategy: 'f' for
   filtered data as in "wb6f", 'h' for Huffman-only compression as in "wb1h",
   'R' for run-length encoding as in "wb1R", or 'F' for fixed code compression
   as in "wb9F".  (See the description of deflateInit2 for more information
   about the strategy parameter.)  'T' will request transparent writing or
   appending with no compression and not using the gzip format.


     "a" can be used instead of "w" to request that the gzip stream that will
   be written be appended to the file.  "+" will result in an error, since
   reading and writing to the same gzip file is not supported.  The addition of
   "x" when writing will create the file exclusively, which fails if the file
   already exists.  On systems that support it, the addition of "e" when
   reading or writing will set the flag to close the file on an execve() call.

   specified (an 'r', 'w', or 'a' was not provided, or '+' was provided).
   errno can be checked to determine if the reason gzopen failed was that the
   file could not be opened.
*/

ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode));
/*
     Associate a gzFile with the file descriptor fd.  File descriptors are
   obtained from calls like open, dup, creat, pipe or fileno (if the file has
   been previously opened with fopen).  The mode parameter is as in gzopen.

     The next call of gzclose on the returned gzFile will also close the file
   descriptor fd, just like fclose(fdopen(fd, mode)) closes the file descriptor
   fd.  If you want to keep fd open, use fd = dup(fd_keep); gz = gzdopen(fd,
   mode);.  The duplicated descriptor should be saved to avoid a leak, since
   gzdopen does not close fd if it fails.  If you are using fileno() to get the
   file descriptor from a FILE *, then you will have to use dup() to avoid
   double-close()ing the file descriptor.  Both gzclose() and fclose() will
   close the associated file descriptor, so they need to have different file
   descriptors.

     gzdopen returns NULL if there was insufficient memory to allocate the
   gzFile state, if an invalid mode was specified (an 'r', 'w', or 'a' was not
   provided, or '+' was provided), or if fd is -1.  The file descriptor is not
   used until the next gz* read, write, seek, or close operation, so gzdopen
   will not detect if fd is invalid (unless fd is -1).
*/

ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size));
/*
     Set the internal buffer size used by this library's functions for file to
   size.  The 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.  Three times that size in buffer space is allocated.  A larger
   buffer size of, for example, 64K or 128K bytes will noticeably increase the
   speed of decompression (reading).

     The new buffer size also affects the maximum length for gzprintf().

     gzbuffer() returns 0 on success, or -1 on failure, such as being called
   too late.
*/

ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
/*
     Dynamically update the compression level and strategy for file.  See the
   description of deflateInit2 for the meaning of these parameters. Previously
   provided data is flushed before applying the parameter changes.

     gzsetparams returns Z_OK if success, Z_STREAM_ERROR if the file was not
   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));
/*
     Read and decompress up to len uncompressed bytes from file into buf.  If
   the input file is not in gzip format, gzread copies the given number of
   bytes into the buffer directly from the file.

     After reaching the end of a gzip stream in the input, gzread will continue
   to read, looking for another gzip stream.  Any number of gzip streams may be
   concatenated in the input file, and will all be decompressed by gzread().
   If something other than a gzip stream is encountered after a gzip stream,

   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 and decompress up to nitems items of size size from file into 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, voidpc buf, unsigned len));

/*
     Compress and write the len uncompressed bytes at buf to file. gzwrite
   returns the number of uncompressed bytes written or 0 in case of error.

*/

ZEXTERN z_size_t ZEXPORT gzfwrite OF((voidpc buf, z_size_t size,
                                      z_size_t nitems, gzFile file));
/*
     Compress and write 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, ...));
/*
     Convert, format, compress, and write the arguments (...) to file under
   control of the string format, as in fprintf.  gzprintf returns the number of
   uncompressed bytes actually written, or a negative zlib error code in case
   of error.  The number of uncompressed bytes written is limited to 8191, or
   one less than the buffer size given to gzbuffer().  The caller should assure
   that this limit is not exceeded.  If it is exceeded, then gzprintf() will
   return an error (0) with nothing written.  In this case, there may also be a
   buffer overflow with unpredictable consequences, which is possible only if
   zlib was compiled with the insecure functions sprintf() or vsprintf(),
   because the secure snprintf() or vsnprintf() functions were not available.
   This can be determined using zlibCompileFlags().
*/

ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));
/*
     Compress and write the given null-terminated string s to file, excluding
   the terminating null character.

     gzputs returns the number of characters written, or -1 in case of error.
*/

ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));
/*
     Read and decompress bytes from file into buf, until len-1 characters are
   read, or until a newline character is read and transferred to buf, or an
   end-of-file condition is encountered.  If any characters are read or if len
   is one, the string is terminated with a null character.  If no characters
   are read due to an end-of-file or len is less than one, then the buffer is
   left untouched.

     gzgets returns buf which is a null-terminated string, or it returns NULL
   for end-of-file or in case of error.  If there was an error, the contents at
   buf are indeterminate.
*/

ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c));
/*
     Compress and write c, converted to an unsigned char, into file.  gzputc
   returns the value that was written, or -1 in case of error.
*/

ZEXTERN int ZEXPORT gzgetc OF((gzFile file));
/*
     Read and decompress one byte from file.  gzgetc returns this byte or -1
   in case of end of file or error.  This is implemented as a macro for speed.
   As such, it does not do all of the checking the other functions do.  I.e.
   it does not check to see if file is NULL, nor whether the structure file
   points to has been clobbered or not.
*/

ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file));
/*
     Push c back onto the stream for file to be read as the first character on
   the next read.  At least one character of push-back is always allowed.
   gzungetc() returns the character pushed, or -1 on failure.  gzungetc() will
   fail if c is -1, and may fail if a character has been pushed but not read
   yet.  If gzungetc is used immediately after gzopen or gzdopen, at least the
   output buffer size of pushed characters is allowed.  (See gzbuffer above.)
   The pushed character will be discarded if the stream is repositioned with
   gzseek() or gzrewind().
*/

ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));
/*
     Flush all pending output to file.  The parameter flush is as in the
   deflate() function.  The return value is the zlib error number (see function
   gzerror below).  gzflush is only permitted when writing.

     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
   concatenated gzip streams.

     gzflush should be called only when strictly necessary because it will
   degrade compression if called too often.
*/

/*
ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file,
                                   z_off_t offset, int whence));

     Set the starting position to offset relative to whence for the next gzread
   or gzwrite on file.  The offset represents a number of bytes in the
   uncompressed data stream.  The whence parameter is defined as in lseek(2);
   the value SEEK_END is not supported.

     If the file is opened for reading, this function is emulated but can be
   extremely slow.  If the file is opened for writing, only forward seeks are
   supported; gzseek then compresses a sequence of zeroes up to the new
   starting position.

     gzseek returns the resulting offset location as measured in bytes from
   the beginning of the uncompressed stream, or -1 in case of error, in
   particular if the file is opened for writing and the new starting position
   would be before the current position.
*/

ZEXTERN int ZEXPORT    gzrewind OF((gzFile file));
/*
     Rewind file. This function is supported only for reading.

     gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET).
*/

/*
ZEXTERN z_off_t ZEXPORT    gztell OF((gzFile file));

     Return the starting position for the next gzread or gzwrite on file.
   This position represents a number of bytes in the uncompressed data stream,
   and is zero when starting, even if appending or reading a gzip stream from
   the middle of a file using gzdopen().

     gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)
*/

/*
ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile file));

     Return the current compressed (actual) read or write offset of file.  This
   offset includes the count of bytes that precede the gzip stream, for example
   when appending or when using gzdopen() for reading.  When reading, the
   offset does not include as yet unused buffered input.  This information can
   be used for a progress indicator.  On error, gzoffset() returns -1.
*/

ZEXTERN int ZEXPORT gzeof OF((gzFile file));
/*
     Return true (1) if the end-of-file indicator for file has been set while
   reading, false (0) otherwise.  Note that the end-of-file indicator is set
   only if the read tried to go past the end of the input, but came up short.
   Therefore, just like feof(), gzeof() may return false even if there is no
   more data to read, in the event that the last read request was for the exact
   number of bytes remaining in the input file.  This will happen if the input
   file size is an exact multiple of the buffer size.

     If gzeof() returns true, then the read functions will return no more data,
   unless the end-of-file indicator is reset by gzclearerr() and the input file
   has grown since the previous end of file was detected.
*/

ZEXTERN int ZEXPORT gzdirect OF((gzFile file));
/*
     Return true (1) if file is being copied directly while reading, or false
   (0) if file is a gzip stream being decompressed.

     If the input file is empty, gzdirect() will return true, since the input
   does not contain a gzip stream.

     If gzdirect() is used immediately after gzopen() or gzdopen() it will
   cause buffers to be allocated to allow reading the file to determine if it
   is a gzip file.  Therefore if gzbuffer() is used, it should be called before
   gzdirect().

     When writing, gzdirect() returns true (1) if transparent writing was
   requested ("wT" for the gzopen() mode), or false (0) otherwise.  (Note:
   gzdirect() is not needed when writing.  Transparent writing must be
   explicitly requested, so the application already knows the answer.  When
   linking statically, using gzdirect() will include all of the zlib code for
   gzip file reading and decompression, which may not be desired.)
*/

ZEXTERN int ZEXPORT    gzclose OF((gzFile file));
/*
     Flush all pending output for file, if necessary, close file and
   deallocate the (de)compression state.  Note that once file is closed, you
   cannot call gzerror with file, since its structures have been deallocated.
   gzclose must not be called more than once on the same file, just as free
   must not be called more than once on the same allocation.

     gzclose will return Z_STREAM_ERROR if file is not valid, Z_ERRNO on a
   file operation error, Z_MEM_ERROR if out of memory, Z_BUF_ERROR if the
   last read ended in the middle of a gzip stream, or Z_OK on success.

   writing respectively.  If gzclose() is used, then both compression and
   decompression code will be included the application when linking to a static
   zlib library.
*/

ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum));
/*
     Return the error message for the last error which occurred on file.
   errnum is set to zlib error number.  If an error occurred in the file system
   and not in the compression library, errnum is set to Z_ERRNO and the
   application may consult errno to get the exact error code.

     The application must not modify the returned string.  Future calls to
   this function may invalidate the previously returned string.  If file is
   closed, then the string previously returned by gzerror will no longer be
   available.

     gzerror() should be used to distinguish errors from end-of-file for those
   functions above that do not distinguish those cases in their return values.
*/

ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
/*
     Clear the error and end-of-file flags for file.  This is analogous to the
   clearerr() function in stdio.  This is useful for continuing to read a gzip
   file that is being written concurrently.
*/

#endif /* !Z_SOLO */

                        /* checksum functions */

/*
     These functions are not related to compression but are exported
   anyway because they might be useful in applications using the compression
   library.
*/

ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
/*
     Update a running Adler-32 checksum with the bytes buf[0..len-1] and
   return the updated checksum. An Adler-32 value is in the range of a 32-bit
   unsigned integer. 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 CRC-32 but can be computed
   much faster.

   Usage example:

     uLong adler = adler32(0L, Z_NULL, 0);

   and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
   each, adler1 and adler2.  adler32_combine() returns the Adler-32 checksum of
   seq1 and seq2 concatenated, requiring only adler1, adler2, and len2.  Note
   that the z_off_t type (like off_t) is a signed integer.  If len2 is
   negative, the result has no meaning or utility.
*/

ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len));
/*
     Update a running CRC-32 with the bytes buf[0..len-1] and return the
   updated CRC-32. A CRC-32 value is in the range of a 32-bit unsigned integer.
   If buf is Z_NULL, this function returns the required initial value for the
   crc. Pre- and post-conditioning (one's complement) is performed within this
   function so it shouldn't be done by the application.

   Usage example:

     uLong crc = crc32(0L, Z_NULL, 0);

     while (read_buffer(buffer, length) != EOF) {
       crc = crc32(crc, buffer, length);
     }
     if (crc != original_crc) error();
*/

ZEXTERN uLong ZEXPORT crc32_z OF((uLong crc, 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));

     Combine two CRC-32 check values into one.  For two sequences of bytes,
   seq1 and seq2 with lengths len1 and len2, CRC-32 check values were
   calculated for each, crc1 and crc2.  crc32_combine() returns the CRC-32
   check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and
   len2.
*/

/*
ZEXTERN uLong ZEXPORT crc32_combine_gen OF((z_off_t len2));

     Return the operator corresponding to length len2, to be used with
   crc32_combine_op().
*/

ZEXTERN uLong ZEXPORT crc32_combine_op OF((uLong crc1, uLong crc2, uLong op));
/*
     Give the same result as crc32_combine(), using op in place of len2. op is
   is generated from len2 by crc32_combine_gen(). This will be faster than
   crc32_combine() if the generated op is used more than once.
*/


                        /* various hacks, don't look :) */

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

#ifdef Z_LARGE64
   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));
   ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
   ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
   ZEXTERN uLong ZEXPORT crc32_combine_gen64 OF((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 OF((const char *, const char *));
     ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int));
     ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));
     ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile));
     ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
     ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
     ZEXTERN uLong ZEXPORT crc32_combine_gen64 OF((z_off_t));
#  endif
#else
   ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
   ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile, z_off_t, int));
   ZEXTERN z_off_t ZEXPORT gztell OF((gzFile));
   ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile));
   ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
   ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
   ZEXTERN uLong ZEXPORT crc32_combine_gen OF((z_off_t));
#endif

#else /* Z_SOLO */

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

#endif /* !Z_SOLO */

/* 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)
ZEXTERN gzFile         ZEXPORT gzopen_w OF((const wchar_t *path,
                                            const char *mode));
#endif
#if defined(STDC) || defined(Z_HAVE_STDARG_H)
#  ifndef Z_SOLO
ZEXTERN int            ZEXPORTVA gzvprintf Z_ARG((gzFile file,
                                                  const char *format,