Plupload.PngEncoder.DeflaterEngine.SlideWindow C# (CSharp) Method

        void SlideWindow()
        {
            Array.Copy(window, WSIZE, window, 0, WSIZE);
            matchStart -= WSIZE;
            strstart -= WSIZE;
            blockStart -= WSIZE;

            // Slide the hash table (could be avoided with 32 bit values
            // at the expense of memory usage).
            for (int i = 0; i < HASH_SIZE; ++i) {
                int m = head[i] & 0xffff;
                head[i] = (short) (m >= WSIZE ? (m - WSIZE) : 0);
            }

            // Slide the prev table.
            for (int i = 0; i < WSIZE; i++) {
                int m = prev[i] & 0xffff;
                prev[i] = (short) (m >= WSIZE ? (m - WSIZE) : 0);
            }
        }