/// <summary>
		/// Construct instance with pending buffer
		/// </summary>
		/// <param name="pending">
		/// Pending buffer to use
		/// </param>>
		public DeflaterEngine(DeflaterPending pending) 
		{
			this.pending = pending;
			huffman = new DeflaterHuffman(pending);
			adler = new Adler32();
			
			window = new byte[2 * WSIZE];
			head   = new short[HASH_SIZE];
			prev   = new short[WSIZE];
			
			// We start at index 1, to avoid an implementation deficiency, that
			// we cannot build a repeat pattern at index 0.
			blockStart = strstart = 1;
		}
		/// <summary>
		/// Creates a new deflater with given compression level.
		/// </summary>
		/// <param name="level">
		/// the compression level, a value between NO_COMPRESSION
		/// and BEST_COMPRESSION.
		/// </param>
		/// <param name="noZlibHeaderOrFooter">
		/// true, if we should suppress the Zlib/RFC1950 header at the
		/// beginning and the adler checksum at the end of the output.  This is
		/// useful for the GZIP/PKZIP formats.
		/// </param>
		/// <exception cref="System.ArgumentOutOfRangeException">if lvl is out of range.</exception>
		public Deflater(int level, bool noZlibHeaderOrFooter)
		{
			if (level == DEFAULT_COMPRESSION) {
				level = 6;
			} else if (level < NO_COMPRESSION || level > BEST_COMPRESSION) {
				throw new ArgumentOutOfRangeException("level");
			}
			
			pending = new DeflaterPending();
			engine = new DeflaterEngine(pending);
			this.noZlibHeaderOrFooter = noZlibHeaderOrFooter;
			SetStrategy(DeflateStrategy.Default);
			SetLevel(level);
			Reset();
		}
		/// <summary>
		/// Construct instance with pending buffer
		/// </summary>
		/// <param name="pending">Pending buffer to use</param>
		public DeflaterHuffman(DeflaterPending pending)
		{
			this.pending = pending;
			
			literalTree = new Tree(this, LITERAL_NUM, 257, 15);
			distTree    = new Tree(this, DIST_NUM, 1, 15);
			blTree      = new Tree(this, BITLEN_NUM, 4, 7);
			
			d_buf = new short[BUFSIZE];
			l_buf = new byte [BUFSIZE];
		}