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https://github.com/aaru-dps/Aaru.Decoders.git
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352 lines
13 KiB
C#
352 lines
13 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : CSS&CPRM.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Device structures decoders.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Decodes DVD CSS & CPRM structures.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2021 Natalia Portillo
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// Copyright © 2020-2021 Rebecca Wallander
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// ****************************************************************************/
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using System.Diagnostics.CodeAnalysis;
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using System.Text;
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namespace Aaru.Decoders.DVD
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{
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// Information from the following standards:
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// ANSI X3.304-1997
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// T10/1048-D revision 9.0
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// T10/1048-D revision 10a
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// T10/1228-D revision 7.0c
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// T10/1228-D revision 11a
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// T10/1363-D revision 10g
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// T10/1545-D revision 1d
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// T10/1545-D revision 5
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// T10/1545-D revision 5a
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// T10/1675-D revision 2c
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// T10/1675-D revision 4
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// T10/1836-D revision 2g
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// ECMA 365
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[SuppressMessage("ReSharper", "InconsistentNaming"), SuppressMessage("ReSharper", "MemberCanBeInternal"),
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SuppressMessage("ReSharper", "MemberCanBePrivate.Global"), SuppressMessage("ReSharper", "NotAccessedField.Global")]
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public static class CSS_CPRM
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{
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public static LeadInCopyright? DecodeLeadInCopyright(byte[] response)
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{
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if(response?.Length != 8)
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return null;
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return new LeadInCopyright
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{
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DataLength = (ushort)((response[0] << 8) + response[1]),
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Reserved1 = response[2],
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Reserved2 = response[3],
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CopyrightType = (CopyrightType)response[4],
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RegionInformation = response[5],
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Reserved3 = response[6],
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Reserved4 = response[7]
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};
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}
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public static RegionalPlaybackControlState? DecodeRegionalPlaybackControlState(byte[] response)
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{
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if(response?.Length != 8)
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return null;
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return new RegionalPlaybackControlState
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{
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DataLength = (ushort)((response[0] << 8) + response[1]),
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Reserved1 = response[2],
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Reserved2 = response[3],
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TypeCode_VendorResetsAvailable_UserControlledChangesAvailable = response[4],
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RegionMask = response[5],
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RPCScheme = response[6],
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Reserved3 = response[7]
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};
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}
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public static string PrettifyRegionalPlaybackControlState(RegionalPlaybackControlState? rpc)
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{
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if(rpc == null)
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{
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return null;
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}
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RegionalPlaybackControlState decoded = rpc.Value;
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var sb = new StringBuilder();
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var typeCode =
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(TypeCode)((decoded.TypeCode_VendorResetsAvailable_UserControlledChangesAvailable & 0xc0) >> 6);
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int vendorResets = (decoded.TypeCode_VendorResetsAvailable_UserControlledChangesAvailable & 0x38) >> 3;
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int userControlledChanges = decoded.TypeCode_VendorResetsAvailable_UserControlledChangesAvailable & 0x7;
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switch(typeCode)
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{
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case TypeCode.None:
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sb.AppendLine("No drive region setting.");
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break;
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case TypeCode.Set:
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sb.AppendLine("Drive region is set.");
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break;
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case TypeCode.LastChance:
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sb.AppendLine("Drive region is set, with additional restrictions required to make a change.");
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break;
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case TypeCode.Perm:
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sb.AppendLine("Drive region has been set permanently, but may be reset by the vendor if necessary.");
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break;
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}
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sb.AppendLine($"Drive has {vendorResets} vendor resets available.");
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sb.AppendLine($"Drive has {userControlledChanges} user controlled changes available.");
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if(decoded.RegionMask == 0xFF)
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sb.AppendLine("Drive has no region set.");
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else if(decoded.RegionMask == 0x00)
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sb.AppendLine("Drive is region free.");
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else
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{
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sb.Append("Drive has the following regions set:");
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if((decoded.RegionMask & 0x01) != 0x01)
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sb.Append(" 1");
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if((decoded.RegionMask & 0x02) != 0x02)
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sb.Append(" 2");
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if((decoded.RegionMask & 0x04) != 0x04)
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sb.Append(" 3");
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if((decoded.RegionMask & 0x08) != 0x08)
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sb.Append(" 4");
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if((decoded.RegionMask & 0x10) != 0x10)
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sb.Append(" 5");
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if((decoded.RegionMask & 0x20) != 0x20)
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sb.Append(" 6");
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if((decoded.RegionMask & 0x40) != 0x40)
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sb.Append(" 7");
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if((decoded.RegionMask & 0x80) != 0x80)
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sb.Append(" 8");
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}
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sb.AppendLine("");
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switch(decoded.RPCScheme)
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{
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case 0x00:
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sb.AppendLine("The Logical Unit does not enforce Region Playback Controls (RPC).");
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break;
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case 0x01:
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sb.AppendLine("The Logical Unit shall adhere to the specification and all requirements of the CSS license agreement concerning RPC.");
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break;
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default:
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sb.AppendLine("The Logical Unit uses an unknown region enforcement scheme.");
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break;
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}
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return sb.ToString();
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}
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public static string PrettifyRegionalPlaybackControlState(byte[] response) =>
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PrettifyRegionalPlaybackControlState(DecodeRegionalPlaybackControlState(response));
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public static string PrettifyLeadInCopyright(LeadInCopyright? cmi)
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{
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if(cmi == null)
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return null;
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LeadInCopyright decoded = cmi.Value;
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var sb = new StringBuilder();
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switch(decoded.CopyrightType)
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{
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case CopyrightType.NoProtection:
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sb.AppendLine("Disc has no encryption.");
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break;
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case CopyrightType.CSS:
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sb.AppendLine("Disc is encrypted using CSS or CPPM.");
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break;
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case CopyrightType.CPRM:
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sb.AppendLine("Disc is encrypted using CPRM.");
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break;
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case CopyrightType.AACS:
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sb.AppendLine("Disc is encrypted using AACS.");
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break;
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default:
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sb.AppendFormat("Disc is encrypted using unknown algorithm with ID {0}.", decoded.CopyrightType);
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break;
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}
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if(decoded.CopyrightType == 0)
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return sb.ToString();
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if(decoded.RegionInformation == 0xFF)
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sb.AppendLine("Disc cannot be played in any region at all.");
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else if(decoded.RegionInformation == 0x00)
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sb.AppendLine("Disc can be played in any region.");
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else
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{
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sb.Append("Disc can be played in the following regions:");
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if((decoded.RegionInformation & 0x01) != 0x01)
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sb.Append(" 1");
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if((decoded.RegionInformation & 0x02) != 0x02)
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sb.Append(" 2");
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if((decoded.RegionInformation & 0x04) != 0x04)
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sb.Append(" 3");
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if((decoded.RegionInformation & 0x08) != 0x08)
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sb.Append(" 4");
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if((decoded.RegionInformation & 0x10) != 0x10)
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sb.Append(" 5");
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if((decoded.RegionInformation & 0x20) != 0x20)
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sb.Append(" 6");
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if((decoded.RegionInformation & 0x40) != 0x40)
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sb.Append(" 7");
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if((decoded.RegionInformation & 0x80) != 0x80)
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sb.Append(" 8");
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}
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return sb.ToString();
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}
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public static string PrettifyLeadInCopyright(byte[] response) =>
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PrettifyLeadInCopyright(DecodeLeadInCopyright(response));
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public struct LeadInCopyright
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{
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/// <summary>Bytes 0 to 1 Data length</summary>
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public ushort DataLength;
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/// <summary>Byte 2 Reserved</summary>
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public byte Reserved1;
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/// <summary>Byte 3 Reserved</summary>
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public byte Reserved2;
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/// <summary>Byte 4 Copy protection system type</summary>
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public CopyrightType CopyrightType;
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/// <summary>Byte 5 Bitmask of regions where this disc is playable</summary>
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public byte RegionInformation;
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/// <summary>Byte 6 Reserved</summary>
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public byte Reserved3;
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/// <summary>Byte 7 Reserved</summary>
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public byte Reserved4;
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}
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public struct DiscKey
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{
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/// <summary>Bytes 0 to 1 Data length</summary>
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public ushort DataLength;
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/// <summary>Byte 2 Reserved</summary>
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public byte Reserved1;
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/// <summary>Byte 3 Reserved</summary>
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public byte Reserved2;
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/// <summary>Bytes 4 to 2052 Disc key for CSS, Album Identifier for CPPM</summary>
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public byte[] Key;
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}
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public struct TitleKey
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{
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/// <summary>Bytes 0 to 1 Data length</summary>
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public ushort DataLength;
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/// <summary>Byte 2 Reserved</summary>
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public byte Reserved1;
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/// <summary>Byte 3 Reserved</summary>
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public byte Reserved2;
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/// <summary>Byte 4 CPM</summary>
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public byte CMI;
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/// <summary>Bytes 5 to 10 Title key for CSS</summary>
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public byte[] Key;
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/// <summary>Byte 11 Reserved</summary>
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public byte Reserved3;
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/// <summary>Byte 12 Reserved</summary>
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public byte Reserved4;
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}
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public struct AuthenticationSuccessFlag
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{
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/// <summary>Bytes 0 to 1 Data length</summary>
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public ushort DataLength;
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/// <summary>Byte 2 Reserved</summary>
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public byte Reserved1;
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/// <summary>Byte 3 Reserved</summary>
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public byte Reserved2;
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/// <summary>Byte 4 Reserved</summary>
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public byte Reserved3;
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/// <summary>Byte 5 Reserved</summary>
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public byte Reserved4;
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/// <summary>Byte 6 Reserved</summary>
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public byte Reserved5;
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/// <summary>Byte 7 Reserved and ASF</summary>
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public byte ASF;
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}
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public struct RegionalPlaybackControlState
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{
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/// <summary>Bytes 0 to 1 Data length</summary>
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public ushort DataLength;
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/// <summary>Byte 2 Reserved</summary>
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public byte Reserved1;
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/// <summary>Byte 3 Reserved</summary>
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public byte Reserved2;
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/// <summary>Byte 4 Type Code and # of Vendor Resets Available and # of User Controlled Changes Available</summary>
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public byte TypeCode_VendorResetsAvailable_UserControlledChangesAvailable;
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/// <summary>Byte 5 Region Mask</summary>
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public byte RegionMask;
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/// <summary>Byte 6 RPC Scheme</summary>
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public byte RPCScheme;
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/// <summary>Byte 7 Reserved</summary>
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public byte Reserved3;
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}
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enum TypeCode
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{
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None = 0, Set = 1, LastChance = 2,
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Perm = 3
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}
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}
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} |