/// <summary>
/// Initialize the ZlibCodec for deflation operation, using the specified CompressionLevel,
/// the specified number of window bits, and the explicit flag governing whether to emit an RFC1950 header byte pair.
/// </summary>
/// <param name="level">The compression level for the codec.</param>
/// <param name="wantRfc1950Header">whether to emit an initial RFC1950 byte pair in the compressed stream.</param>
/// <param name="bits">the number of window bits to use. If you don't know what this means, don't use this method.</param>
/// <returns>Z_OK if all goes well.</returns>
public int InitializeDeflate(CompressionLevel level, int bits, bool wantRfc1950Header)
{
if (istate != null) throw new ZlibException("You may not call InitializeDeflate() after calling InitializeInflate().");
dstate = new DeflateManager();
dstate.WantRfc1950HeaderBytes = wantRfc1950Header;
return dstate.Initialize(this, level, bits);
}