Aaru.Decoders/DVD/CSS&CPRM.cs

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : CSS&CPRM.cs
// Version        : 1.0
// Author(s)      : Natalia Portillo
//
// Component      : Component
//
// Revision       : $Revision$
// Last change by : $Author$
// Date           : $Date$
//
// --[ Description ] ----------------------------------------------------------
//
// Description
//
// --[ License ] --------------------------------------------------------------
//
//     This program 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.
//
//     This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright (C) 2011-2015 Claunia.com
// ****************************************************************************/
// //$Id$
using System;
using System.Text;

namespace DiscImageChef.Decoders.DVD
{
    /// <summary>
    /// Information from the following standards:
    /// ANSI X3.304-1997
    /// T10/1048-D revision 9.0
    /// T10/1048-D revision 10a
    /// T10/1228-D revision 7.0c
    /// T10/1228-D revision 11a
    /// T10/1363-D revision 10g
    /// T10/1545-D revision 1d
    /// T10/1545-D revision 5
    /// T10/1545-D revision 5a
    /// T10/1675-D revision 2c
    /// T10/1675-D revision 4
    /// T10/1836-D revision 2g
    /// ECMA 365
    /// </summary>
    public static class CSS_CPRM
    {
        public struct LeadInCopyright
        {
            /// <summary>
            /// Bytes 0 to 1
            /// Data length
            /// </summary>
            public UInt16 DataLength;
            /// <summary>
            /// Byte 2
            /// Reserved
            /// </summary>
            public byte Reserved1;
            /// <summary>
            /// Byte 3
            /// Reserved
            /// </summary>
            public byte Reserved2;
            /// <summary>
            /// Byte 4
            /// Copy protection system type
            /// </summary>
            public byte CopyrightType;
            /// <summary>
            /// Byte 5
            /// Bitmask of regions where this disc is playable
            /// </summary>
            public byte RegionInformation;
            /// <summary>
            /// Byte 6
            /// Reserved
            /// </summary>
            public byte Reserved3;
            /// <summary>
            /// Byte 7
            /// Reserved
            /// </summary>
            public byte Reserved4;
        }

        public struct DiscKey
        {
            /// <summary>
            /// Bytes 0 to 1
            /// Data length
            /// </summary>
            public UInt16 DataLength;
            /// <summary>
            /// Byte 2
            /// Reserved
            /// </summary>
            public byte Reserved1;
            /// <summary>
            /// Byte 3
            /// Reserved
            /// </summary>
            public byte Reserved2;
            /// <summary>
            /// Bytes 4 to 2052
            /// Disc key for CSS, Album Identifier for CPPM
            /// </summary>
            public byte[] Key;
        }

        public static LeadInCopyright? DecodeLeadInCopyright(byte[] response)
        {
            if(response == null)
                return null;

            if (response.Length != 8)
                return null;

            LeadInCopyright cmi = new LeadInCopyright();

            cmi.DataLength = (ushort)((response[0] << 8) + response[1]);
            cmi.Reserved1 = response[2];
            cmi.Reserved2 = response[3];
            cmi.CopyrightType = response[4];
            cmi.RegionInformation = response[5];
            cmi.Reserved3 = response[6];
            cmi.Reserved4 = response[7];

            return cmi;
        }

        public static string PrettifyLeadInCopyright(LeadInCopyright? cmi)
        {
            if (cmi == null)
                return null;

            LeadInCopyright decoded = cmi.Value;
            StringBuilder sb = new StringBuilder();

            switch (decoded.CopyrightType)
            {
                case 0x00:
                    sb.AppendLine("Disc has no encryption.");
                    break;
                case 0x01:
                    sb.AppendLine("Disc is encrypted using CSS or CPPM.");
                    break;
                case 0x02:
                    sb.AppendLine("Disc is encrypted using CPRM.");
                    break;
                case 0x10:
                    sb.AppendLine("Disc is encrypted using AACS.");
                    break;
                default:
                    sb.AppendFormat("Disc is encrypted using unknown algorithm with ID {0}.", decoded.CopyrightType);
                    break;
            }

            if (decoded.CopyrightType == 0)
                return sb.ToString();

            if (decoded.RegionInformation == 0xFF)
                sb.AppendLine("Disc cannot be played in any region at all.");
            else if (decoded.RegionInformation == 0x00)
                sb.AppendLine("Disc can be played in any region.");
            else
            {
                sb.Append("Disc can be played in the following regions:");
                if ((decoded.RegionInformation & 0x01) != 0x01)
                    sb.Append(" 0");
                if ((decoded.RegionInformation & 0x02) != 0x02)
                    sb.Append(" 1");
                if ((decoded.RegionInformation & 0x04) != 0x04)
                    sb.Append(" 2");
                if ((decoded.RegionInformation & 0x08) != 0x08)
                    sb.Append(" 3");
                if ((decoded.RegionInformation & 0x10) != 0x10)
                    sb.Append(" 4");
                if ((decoded.RegionInformation & 0x20) != 0x20)
                    sb.Append(" 5");
                if ((decoded.RegionInformation & 0x40) != 0x40)
                    sb.Append(" 6");
                if ((decoded.RegionInformation & 0x80) != 0x80)
                    sb.Append(" 7");
            }

            return sb.ToString();
        }

        public static string PrettifyLeadInCopyright(byte[] response)
        {
            return PrettifyLeadInCopyright(DecodeLeadInCopyright(response));
        }
    }
}