示例#1
0
        /// <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];
        }
示例#2
0
        /// <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;
        }
示例#3
0
        /// <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();
        }