Aaru/SCSI/Modes/1C_SFF.cs

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : 1C_SFF.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Device structures decoders.
//
// --[ Description ] ----------------------------------------------------------
//
//     Decodes SCSI MODE PAGE 1Ch: Timer & Protect page.
//
// --[ 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 © 2011-2019 Natalia Portillo
// ****************************************************************************/

using System.Diagnostics.CodeAnalysis;
using System.Text;

namespace DiscImageChef.Decoders.SCSI
{
    [SuppressMessage("ReSharper", "InconsistentNaming")]
    [SuppressMessage("ReSharper", "MemberCanBeInternal")]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    public static partial class Modes
    {
        #region Mode Page 0x1C: Timer & Protect page
        /// <summary>
        ///     Timer &amp; Protect page
        ///     Page code 0x1C
        ///     8 bytes in INF-8070
        /// </summary>
        public struct ModePage_1C_SFF
        {
            /// <summary>
            ///     Parameters can be saved
            /// </summary>
            public bool PS;
            /// <summary>
            ///     Time the device shall remain in the current state after seek, read or write operation
            /// </summary>
            public byte InactivityTimeMultiplier;
            /// <summary>
            ///     Disabled until power cycle
            /// </summary>
            public bool DISP;
            /// <summary>
            ///     Software Write Protect until Power-down
            /// </summary>
            public bool SWPP;
        }

        public static ModePage_1C_SFF? DecodeModePage_1C_SFF(byte[] pageResponse)
        {
            if((pageResponse?[0] & 0x40) == 0x40) return null;

            if((pageResponse?[0] & 0x3F) != 0x1C) return null;

            if(pageResponse[1] + 2 != pageResponse.Length) return null;

            if(pageResponse.Length < 8) return null;

            ModePage_1C_SFF decoded = new ModePage_1C_SFF();

            decoded.PS   |= (pageResponse[0] & 0x80) == 0x80;
            decoded.DISP |= (pageResponse[2] & 0x02) == 0x02;
            decoded.SWPP |= (pageResponse[3] & 0x01) == 0x01;

            decoded.InactivityTimeMultiplier = (byte)(pageResponse[3] & 0x0F);

            return decoded;
        }

        public static string PrettifyModePage_1C_SFF(byte[] pageResponse) =>
            PrettifyModePage_1C_SFF(DecodeModePage_1C_SFF(pageResponse));

        public static string PrettifyModePage_1C_SFF(ModePage_1C_SFF? modePage)
        {
            if(!modePage.HasValue) return null;

            ModePage_1C_SFF page = modePage.Value;
            StringBuilder   sb   = new StringBuilder();

            sb.AppendLine("SCSI Timer & Protect page:");

            if(page.PS) sb.AppendLine("\tParameters can be saved");

            if(page.DISP) sb.AppendLine("\tDrive is disabled until power is cycled");
            if(page.SWPP) sb.AppendLine("\tDrive is software write-protected until powered down");

            switch(page.InactivityTimeMultiplier)
            {
                case 0:
                    sb.AppendLine("\tDrive will remain in same status a vendor-specified time after a seek, read or write operation");
                    break;
                case 1:
                    sb.AppendLine("\tDrive will remain in same status 125 ms after a seek, read or write operation");
                    break;
                case 2:
                    sb.AppendLine("\tDrive will remain in same status 250 ms after a seek, read or write operation");
                    break;
                case 3:
                    sb.AppendLine("\tDrive will remain in same status 500 ms after a seek, read or write operation");
                    break;
                case 4:
                    sb.AppendLine("\tDrive will remain in same status 1 second after a seek, read or write operation");
                    break;
                case 5:
                    sb.AppendLine("\tDrive will remain in same status 2 seconds after a seek, read or write operation");
                    break;
                case 6:
                    sb.AppendLine("\tDrive will remain in same status 4 seconds after a seek, read or write operation");
                    break;
                case 7:
                    sb.AppendLine("\tDrive will remain in same status 8 seconds after a seek, read or write operation");
                    break;
                case 8:
                    sb.AppendLine("\tDrive will remain in same status 16 seconds after a seek, read or write operation");
                    break;
                case 9:
                    sb.AppendLine("\tDrive will remain in same status 32 seconds after a seek, read or write operation");
                    break;
                case 10:
                    sb.AppendLine("\tDrive will remain in same status 1 minute after a seek, read or write operation");
                    break;
                case 11:
                    sb.AppendLine("\tDrive will remain in same status 2 minutes after a seek, read or write operation");
                    break;
                case 12:
                    sb.AppendLine("\tDrive will remain in same status 4 minutes after a seek, read or write operation");
                    break;
                case 13:
                    sb.AppendLine("\tDrive will remain in same status 8 minutes after a seek, read or write operation");
                    break;
                case 14:
                    sb.AppendLine("\tDrive will remain in same status 16 minutes after a seek, read or write operation");
                    break;
                case 15:
                    sb.AppendLine("\tDrive will remain in same status 32 minutes after a seek, read or write operation");
                    break;
            }

            return sb.ToString();
        }
        #endregion Mode Page 0x1C: Timer & Protect page
    }
}