1  typedef void * (*alloc_func)(void * opaque, unsigned items, unsigned size);
       2  typedef void (*free_func)(void * opaque, void * address);
       3  
       4  typedef struct z_stream_s {
       5    char *msg;
       6    alloc_func zalloc;
       7    free_func zfree;
       8    void * opaque;
       9  } z_stream;
      10  
      11  void * zcalloc(void * opaque, unsigned items, unsigned size);
      12  void zcfree(void * opaque, void * ptr);
      13  
      14  int deflateInit2_(z_stream *strm, int level, int method, int windowBits,
      15                    int memLevel, int strategy, const char *version,
      16                    int stream_size) {
      17    int noheader = 0;
      18    static const char *my_version = "1.1.3";
      19  
      20    if (version == 0 || version[0] != my_version[0] ||
      21        stream_size != sizeof(z_stream)) {
      22      return (-6);
      23    }
      24    if (strm == 0)
      25      return (-2);
      26  
      27    strm->msg = 0;
      28    if (strm->zalloc == 0) {
      29      strm->zalloc = zcalloc;
      30      strm->opaque = (void *)0;
      31    }
      32    if (strm->zfree == 0)
      33      strm->zfree = zcfree;
      34  
      35    if (level == (-1))
      36      level = 6;
      37  
      38    if (windowBits < 0) {
      39      noheader = 1;
      40      windowBits = -windowBits;
      41    }
      42    if (memLevel < 1 || memLevel > 9 || method != 8 || windowBits < 8 ||
      43        windowBits > 15 || level < 0 || level > 9 || strategy < 0 ||
      44        strategy > 2) {
      45      return (-2);
      46    }
      47    (*((strm)->zalloc))((strm)->opaque, (1), 112);
      48    return 0;
      49  }