Aaru/SCSI/DiscStructureCapabilities.cs

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : DiscStructureCapabilities.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Device structures decoders.
//
// --[ Description ] ----------------------------------------------------------
//
//     Decodes SCSI's DISC STRUCTURE structures.
//
// --[ License ] --------------------------------------------------------------
//
//     This library is free software; you can redistribute it and/or modify
//     it under the terms of the GNU Lesser General Public License as
//     published by the Free Software Foundation; either version 2.1 of the
//     License, or (at your option) any later version.
//
//     This library 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
//     Lesser General Public License for more details.
//
//     You should have received a copy of the GNU Lesser General Public
//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2018 Natalia Portillo
// ****************************************************************************/

using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;

namespace DiscImageChef.Decoders.SCSI
{
    [SuppressMessage("ReSharper", "InconsistentNaming")]
    [SuppressMessage("ReSharper", "MemberCanBeInternal")]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    [SuppressMessage("ReSharper", "NotAccessedField.Global")]
    public static class DiscStructureCapabilities
    {
        public struct Capability
        {
            /// <summary>
            /// READ/SEND DISC STRUCTURE format code
            /// </summary>
            public byte FormatCode;
            /// <summary>
            /// Supported in SEND DISC STRUCTURE
            /// </summary>
            public bool SDS;
            /// <summary>
            /// Supported in READ DISC STRUCTURE
            /// </summary>
            public bool RDS;
        }

        public static Capability[] Decode(byte[] response)
        {
            ushort len = (ushort)((response[0] << 8) + response[1]);

            if(len + 2 != response.Length) return null;

            List<Capability> caps = new List<Capability>();

            uint offset = 4;

            while(offset < response.Length)
            {
                Capability cap = new Capability
                {
                    FormatCode = response[offset],
                    SDS = (response[offset + 1] & 0x80) == 0x80,
                    RDS = (response[offset + 1] & 0x40) == 0x40
                };
                caps.Add(cap);
                offset += 4;
            }

            return caps.ToArray();
        }
    }
}