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211 lines
10 KiB
C#
211 lines
10 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : ISO.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : ISO9660 filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// ISO9660 filesystem 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 © 2011-2018 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace DiscImageChef.Filesystems.ISO9660
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{
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public partial class ISO9660
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{
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct PrimaryVolumeDescriptor
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{
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public byte type;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)] public byte[] id;
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public byte version;
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// Only used in SVDs
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public byte flags;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public byte[] system_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public byte[] volume_id;
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public ulong reserved1;
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public uint volume_space_size;
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public uint volume_space_size_be;
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// Only used in SVDs
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public byte[] escape_sequences;
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public ushort volume_set_size;
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public ushort volume_set_size_be;
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public ushort volume_sequence_number;
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public ushort volume_sequence_number_be;
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public ushort logical_block_size;
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public ushort logical_block_size_be;
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public uint path_table_size;
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public uint path_table_size_be;
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public uint type_1_path_table;
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public uint opt_type_1_path_table;
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public uint type_m_path_table;
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public uint opt_type_m_path_table;
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public DirectoryRecord root_directory_record;
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public byte root_directory_name;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)] public byte[] volume_set_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)] public byte[] publisher_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)] public byte[] preparer_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)] public byte[] application_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 37)] public byte[] copyright_file_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 37)] public byte[] abstract_file_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 37)] public byte[] bibliographic_file_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public byte[] creation_date;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public byte[] modification_date;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public byte[] expiration_date;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public byte[] effective_date;
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public byte file_structure_version;
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public byte reserved2;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 512)] public byte[] application_data;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 653)] public byte[] reserved3;
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct BootRecord
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{
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public byte type;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)] public byte[] id;
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public byte version;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public byte[] system_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public byte[] boot_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 1977)] public byte[] boot_use;
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct PartitionDescriptor
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{
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public byte type;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)] public byte[] id;
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public byte version;
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public byte reserved1;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public byte[] system_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public byte[] partition_id;
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public uint partition_location;
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public uint partition_location_be;
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public uint partition_size;
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public uint partition_size_be;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 1960)] public byte[] system_use;
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct DirectoryRecord
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{
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public byte length;
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public byte xattr_len;
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public uint extent;
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public uint extent_be;
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public uint size;
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public uint size_be;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 7)] public byte[] date;
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public FileFlags flags;
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public byte file_unit_size;
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public byte interleave;
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public ushort volume_sequence_number;
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public ushort volume_sequence_number_be;
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public byte name_len;
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// Followed by name[name_len] and then system area until length arrives
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct ExtendedAttributeRecord
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{
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public ushort owner;
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public ushort owner_be;
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public ushort group;
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public ushort group_be;
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public Permissions permissions;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public byte[] creation_date;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public byte[] modification_date;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public byte[] expiration_date;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 17)] public byte[] effective_date;
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public RecordFormat record_format;
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public RecordAttribute record_attributes;
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public ushort record_length;
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public ushort record_length_be;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public byte[] system_id;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public byte[] system_use;
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public byte record_version;
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public byte escape_len;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] public byte[] reserved1;
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public ushort app_use_len;
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public ushort app_use_len_be;
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}
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// There are two tables one in little endian one in big endian
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct PathTableEntry
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{
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public byte name_len;
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public byte xattr_len;
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public uint start_lbn;
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public ushort parent_dirno;
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// Followed by name[name_len]
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}
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static DecodedVolumeDescriptor DecodeVolumeDescriptor(PrimaryVolumeDescriptor pvd)
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{
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DecodedVolumeDescriptor decodedVD = new DecodedVolumeDescriptor();
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decodedVD.SystemIdentifier = Encoding.ASCII.GetString(pvd.system_id).TrimEnd().Trim('\0');
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decodedVD.VolumeIdentifier = Encoding.ASCII.GetString(pvd.volume_id).TrimEnd().Trim('\0');
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decodedVD.VolumeSetIdentifier = Encoding.ASCII.GetString(pvd.volume_set_id).TrimEnd().Trim('\0');
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decodedVD.PublisherIdentifier = Encoding.ASCII.GetString(pvd.publisher_id).TrimEnd().Trim('\0');
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decodedVD.DataPreparerIdentifier = Encoding.ASCII.GetString(pvd.preparer_id).TrimEnd().Trim('\0');
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decodedVD.ApplicationIdentifier =
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Encoding.ASCII.GetString(pvd.application_data).TrimEnd().Trim('\0');
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if(pvd.creation_date[0] == '0' || pvd.creation_date[0] == 0x00)
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decodedVD.CreationTime = DateTime.MinValue;
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else decodedVD.CreationTime = DateHandlers.ISO9660ToDateTime(pvd.creation_date);
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if(pvd.modification_date[0] == '0' || pvd.modification_date[0] == 0x00) decodedVD.HasModificationTime = false;
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else
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{
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decodedVD.HasModificationTime = true;
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decodedVD.ModificationTime = DateHandlers.ISO9660ToDateTime(pvd.modification_date);
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}
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if(pvd.expiration_date[0] == '0' || pvd.expiration_date[0] == 0x00) decodedVD.HasExpirationTime = false;
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else
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{
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decodedVD.HasExpirationTime = true;
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decodedVD.ExpirationTime = DateHandlers.ISO9660ToDateTime(pvd.expiration_date);
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}
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if(pvd.effective_date[0] == '0' || pvd.effective_date[0] == 0x00) decodedVD.HasEffectiveTime = false;
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else
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{
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decodedVD.HasEffectiveTime = true;
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decodedVD.EffectiveTime = DateHandlers.ISO9660ToDateTime(pvd.effective_date);
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}
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decodedVD.Blocks = pvd.volume_space_size;
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decodedVD.BlockSize = pvd.logical_block_size;
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return decodedVD;
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}
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}
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} |