zzip_file_open - start usage.

        Guido Draheim <guidod@gmx.de> Tomi Ollila <Tomi.Ollila@iki.fi>

        Copyright (c) Guido Draheim, use under copyleft (LGPL,MPL)

zziplib                                              0.13.78                                   zzip_file_open(3)

        The zzip_file_open function opens an ZZIP_FILE from an already open ZZIP_DIR handle. Since we have a
       chance to reuse a cached buf32k and ZZIP_FILE memchunk this is the best choice to unpack multiple files.

        Note: the zlib supports 2..15 bit windowsize, hence we provide a 32k memchunk here... just to be safe.

        On error it returns null and sets errcode in the ZZIP_DIR.

       zzip_file_open -  start usage.

#include<zzip/lib.h>

       ZZIP_FILE*
       zzip_file_open(ZZIP_DIR* dir, zzip_char_t* name, int o_mode)