this(os, createDeflater(compressionLevel, strategy, encodingMode));  _isGzip = (encodingMode == ZlibModule.FORCE_GZIP);  if (_isGzip) _crc32 = new CRC32();
_os = os; _out = new DeflaterOutputStream(_os, def);  _os.write(_header, 0, _header.length);
  public ZlibOutputStream(OutputStream os,			  int compressionLevel,			  int strategy,			  int encodingMode)    throws IOException  {    this(os, createDeflater(compressionLevel, strategy, encodingMode));    _isGzip = (encodingMode == ZlibModule.FORCE_GZIP);    if (_isGzip)      _crc32 = new CRC32();  }