Aaru/SCSI/Modes/00_SFF.cs

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : 00_SFF.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Device structures decoders.
//
// --[ Description ] ----------------------------------------------------------
//
//     Decodes SCSI MODE PAGE 00h: Drive Operation Mode 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 © 2011-2018 Natalia Portillo
// ****************************************************************************/

using System.Text;

namespace DiscImageChef.Decoders.SCSI
{
    public static partial class Modes
    {
        #region Mode Page 0x00: Drive Operation Mode page
        /// <summary>
        /// Drive Operation Mode page
        /// Page code 0x00
        /// 4 bytes in INF-8070
        /// </summary>
        public struct ModePage_00_SFF
        {
            /// <summary>
            /// Parameters can be saved
            /// </summary>
            public bool PS;
            /// <summary>
            /// Select LUN Mode
            /// </summary>
            public bool SLM;
            /// <summary>
            /// Select LUN for rewritable
            /// </summary>
            public bool SLR;
            /// <summary>
            /// Disable verify for WRITE
            /// </summary>
            public bool DVW;
            /// <summary>
            /// Disable deferred error
            /// </summary>
            public bool DDE;
        }

        public static ModePage_00_SFF? DecodeModePage_00_SFF(byte[] pageResponse)
        {
            if(pageResponse == null) return null;

            if((pageResponse[0] & 0x40) == 0x40) return null;

            if((pageResponse[0] & 0x3F) != 0x00) return null;

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

            if(pageResponse.Length < 4) return null;

            ModePage_00_SFF decoded = new ModePage_00_SFF();

            decoded.PS |= (pageResponse[0] & 0x80) == 0x80;

            decoded.SLM |= (pageResponse[2] & 0x80) == 0x80;
            decoded.SLR |= (pageResponse[2] & 0x40) == 0x40;
            decoded.DVW |= (pageResponse[2] & 0x20) == 0x20;

            decoded.DDE |= (pageResponse[3] & 0x10) == 0x10;

            return decoded;
        }

        public static string PrettifyModePage_00_SFF(byte[] pageResponse)
        {
            return PrettifyModePage_00_SFF(DecodeModePage_00_SFF(pageResponse));
        }

        public static string PrettifyModePage_00_SFF(ModePage_00_SFF? modePage)
        {
            if(!modePage.HasValue) return null;

            ModePage_00_SFF page = modePage.Value;
            StringBuilder sb = new StringBuilder();

            sb.AppendLine("SCSI Drive Operation Mode page:");

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

            if(page.DVW) sb.AppendLine("\tVerifying after writing is disabled");
            if(page.DDE) sb.AppendLine("\tDrive will abort when a writing error is detected");

            if(page.SLM)
            {
                sb.Append("\tDrive has two LUNs with rewritable being ");
                if(page.SLM) sb.AppendLine("LUN 1");
                else sb.AppendLine("LUN 0");
            }

            return sb.ToString();
        }
        #endregion Mode Page 0x00: Drive Operation Mode page
    }
}