// This file is part of the Noddybox.Emulation C# suite.
//
// Noddybox.Emulation is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Noddybox.Emulation is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Noddybox.Emulation.  If not, see <http://www.gnu.org/licenses/>.
//
// Copyright (c) Ian Cowburn 2012
//
using System;

namespace Noddybox.Emulation.EightBit
{
    /// <summary>
    /// Provides helpers for shifting smaller values around without casts all over the shop.
    /// </summary>
    public static class Binary
    {
        /// <summary>
        /// Shift 8-bits to the left.
        /// </summary>
        /// <param name="b">The byte.</param>
        /// <param name="shift">How many bits to shift.</param>
        /// <returns>The shifted value.</returns>
        public static byte ShiftLeft(byte b, int shift)
        {
            return (byte)((b << shift) & 0xff);
        }

        /// <summary>
        /// Shift 8-bits to the right.
        /// </summary>
        /// <param name="b">The byte.</param>
        /// <param name="shift">How many bits to shift.</param>
        /// <returns>The shifted value.</returns>
        public static byte ShiftRight(byte b, int shift)
        {
            return (byte)((b >> shift) & 0xff);
        }

        /// <summary>
        /// Shift 16-bits to the left.
        /// </summary>
        /// <param name="w">The word.</param>
        /// <param name="shift">How many bits to shift.</param>
        /// <returns>The shifted value.</returns>
        public static ushort ShiftLeft(ushort w, int shift)
        {
            return (ushort)((w << shift) & 0xffff);
        }

        /// <summary>
        /// Shift 16-bits to the right.
        /// </summary>
        /// <param name="w">The word.</param>
        /// <param name="shift">How many bits to shift.</param>
        /// <returns>The shifted value.</returns>
        public static ushort ShiftRight(ushort w, int shift)
        {
            return (ushort)((w >> shift) & 0xffff);
        }
    }
}