// /*************************************************************************** // Aaru Data Preservation Suite // ---------------------------------------------------------------------------- // // Filename : ISO.cs // Author(s) : Natalia Portillo // // Component : ISO9660 filesystem plugin. // // --[ Description ] ---------------------------------------------------------- // // ISO9660 filesystem 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 . // // ---------------------------------------------------------------------------- // Copyright © 2011-2022 Natalia Portillo // In the loving memory of Facunda "Tata" Suárez Domínguez, R.I.P. 2019/07/24 // ****************************************************************************/ // ReSharper disable UnusedType.Local using System; using System.Runtime.InteropServices; using System.Text; using Aaru.Helpers; namespace Aaru.Filesystems; public sealed partial class ISO9660 { static DecodedVolumeDescriptor DecodeVolumeDescriptor(PrimaryVolumeDescriptor pvd, Encoding encoding = null) { encoding ??= Encoding.ASCII; var decodedVd = new DecodedVolumeDescriptor { SystemIdentifier = StringHandlers.CToString(pvd.system_id, encoding).TrimEnd(), VolumeIdentifier = StringHandlers.CToString(pvd.volume_id, encoding).TrimEnd(), VolumeSetIdentifier = StringHandlers.CToString(pvd.volume_set_id, encoding).TrimEnd(), PublisherIdentifier = StringHandlers.CToString(pvd.publisher_id, encoding).TrimEnd(), DataPreparerIdentifier = StringHandlers.CToString(pvd.preparer_id, encoding).TrimEnd(), ApplicationIdentifier = StringHandlers.CToString(pvd.application_id, encoding).TrimEnd() }; if(pvd.creation_date[0] == '0' || pvd.creation_date[0] == 0x00) decodedVd.CreationTime = DateTime.MinValue; else decodedVd.CreationTime = DateHandlers.Iso9660ToDateTime(pvd.creation_date); if(pvd.modification_date[0] == '0' || pvd.modification_date[0] == 0x00) decodedVd.HasModificationTime = false; else { decodedVd.HasModificationTime = true; decodedVd.ModificationTime = DateHandlers.Iso9660ToDateTime(pvd.modification_date); } if(pvd.expiration_date[0] == '0' || pvd.expiration_date[0] == 0x00) decodedVd.HasExpirationTime = false; else { decodedVd.HasExpirationTime = true; decodedVd.ExpirationTime = DateHandlers.Iso9660ToDateTime(pvd.expiration_date); } if(pvd.effective_date[0] == '0' || pvd.effective_date[0] == 0x00) decodedVd.HasEffectiveTime = false; else { decodedVd.HasEffectiveTime = true; decodedVd.EffectiveTime = DateHandlers.Iso9660ToDateTime(pvd.effective_date); } decodedVd.Blocks = pvd.volume_space_size; decodedVd.BlockSize = pvd.logical_block_size; return decodedVd; } [StructLayout(LayoutKind.Sequential, Pack = 1)] readonly struct PrimaryVolumeDescriptor { public readonly byte type; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)] public readonly byte[] id; public readonly byte version; // Only used in SVDs public readonly byte flags; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public readonly byte[] system_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public readonly byte[] volume_id; public readonly ulong reserved1; public readonly uint volume_space_size; public readonly uint volume_space_size_be; // Only used in SVDs [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public readonly byte[] escape_sequences; public readonly ushort volume_set_size; public readonly ushort volume_set_size_be; public readonly ushort volume_sequence_number; public readonly ushort volume_sequence_number_be; public readonly ushort logical_block_size; public readonly ushort logical_block_size_be; public readonly uint path_table_size; public readonly uint path_table_size_be; public readonly uint type_l_path_table; public readonly uint opt_type_l_path_table; public readonly uint type_m_path_table; public readonly uint opt_type_m_path_table; public readonly DirectoryRecord root_directory_record; public readonly byte root_directory_name; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)] public readonly byte[] volume_set_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)] public readonly byte[] publisher_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)] public readonly byte[] preparer_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)] public readonly byte[] application_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 37)] public readonly byte[] copyright_file_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 37)] public readonly byte[] abstract_file_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 37)] public readonly byte[] bibliographic_file_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public readonly byte[] creation_date; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public readonly byte[] modification_date; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public readonly byte[] expiration_date; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public readonly byte[] effective_date; public readonly byte file_structure_version; public readonly byte reserved2; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 512)] public readonly byte[] application_data; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 653)] public readonly byte[] reserved3; } [StructLayout(LayoutKind.Sequential, Pack = 1)] readonly struct BootRecord { public readonly byte type; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)] public readonly byte[] id; public readonly byte version; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public readonly byte[] system_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public readonly byte[] boot_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1977)] public readonly byte[] boot_use; } [StructLayout(LayoutKind.Sequential, Pack = 1)] readonly struct PartitionDescriptor { public readonly byte type; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)] public readonly byte[] id; public readonly byte version; public readonly byte reserved1; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public readonly byte[] system_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public readonly byte[] partition_id; public readonly uint partition_location; public readonly uint partition_location_be; public readonly uint partition_size; public readonly uint partition_size_be; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1960)] public readonly byte[] system_use; } [StructLayout(LayoutKind.Sequential, Pack = 1)] readonly struct DirectoryRecord { public readonly byte length; public readonly byte xattr_len; public readonly uint extent; public readonly uint extent_be; public readonly uint size; public readonly uint size_be; public readonly IsoTimestamp date; public readonly FileFlags flags; public readonly byte file_unit_size; public readonly byte interleave; public readonly ushort volume_sequence_number; public readonly ushort volume_sequence_number_be; public readonly byte name_len; // Followed by name[name_len] and then system area until length arrives } [StructLayout(LayoutKind.Sequential, Pack = 1)] readonly struct ExtendedAttributeRecord { public readonly ushort owner; public readonly ushort owner_be; public readonly ushort group; public readonly ushort group_be; public readonly Permissions permissions; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public readonly byte[] creation_date; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public readonly byte[] modification_date; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public readonly byte[] expiration_date; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public readonly byte[] effective_date; public readonly RecordFormat record_format; public readonly RecordAttribute record_attributes; public readonly ushort record_length; public readonly ushort record_length_be; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public readonly byte[] system_id; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public readonly byte[] system_use; public readonly byte record_version; public readonly byte escape_len; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public readonly byte[] reserved1; public readonly ushort app_use_len; public readonly ushort app_use_len_be; } // There are two tables one in little endian one in big endian [StructLayout(LayoutKind.Sequential, Pack = 1)] readonly struct PathTableEntry { public readonly byte name_len; public readonly byte xattr_len; public readonly uint start_lbn; public readonly ushort parent_dirno; // Followed by name[name_len] } [StructLayout(LayoutKind.Sequential, Pack = 1)] readonly struct IsoTimestamp { public readonly byte Years; public readonly byte Month; public readonly byte Day; public readonly byte Hour; public readonly byte Minute; public readonly byte Second; public readonly sbyte GmtOffset; } }