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232 lines
9.2 KiB
C#
232 lines
9.2 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Info.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : BeOS filesystem plugin.
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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 © 2011-2023 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Text;
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using Aaru.CommonTypes.AaruMetadata;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Helpers;
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using Partition = Aaru.CommonTypes.Partition;
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namespace Aaru.Filesystems;
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// Information from Practical Filesystem Design, ISBN 1-55860-497-9
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/// <inheritdoc />
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/// <summary>Implements detection of the Be (new) filesystem</summary>
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[SuppressMessage("ReSharper", "UnusedMember.Local")]
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public sealed partial class BeFS
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{
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/// <inheritdoc />
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public bool Identify(IMediaImage imagePlugin, Partition partition)
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{
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if(2 + partition.Start >= partition.End)
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return false;
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ErrorNumber errno = imagePlugin.ReadSector(0 + partition.Start, out byte[] sbSector);
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if(errno != ErrorNumber.NoError)
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return false;
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uint magic = BitConverter.ToUInt32(sbSector, 0x20);
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uint magicBe = BigEndianBitConverter.ToUInt32(sbSector, 0x20);
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if(magic == BEFS_MAGIC1 ||
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magicBe == BEFS_MAGIC1)
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return true;
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if(sbSector.Length >= 0x400)
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{
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magic = BitConverter.ToUInt32(sbSector, 0x220);
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magicBe = BigEndianBitConverter.ToUInt32(sbSector, 0x220);
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}
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if(magic == BEFS_MAGIC1 ||
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magicBe == BEFS_MAGIC1)
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return true;
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errno = imagePlugin.ReadSector(1 + partition.Start, out sbSector);
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if(errno != ErrorNumber.NoError)
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return false;
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magic = BitConverter.ToUInt32(sbSector, 0x20);
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magicBe = BigEndianBitConverter.ToUInt32(sbSector, 0x20);
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return magic == BEFS_MAGIC1 || magicBe == BEFS_MAGIC1;
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}
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/// <inheritdoc />
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public void GetInformation(IMediaImage imagePlugin, Partition partition, Encoding encoding, out string information,
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out FileSystem metadata)
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{
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encoding ??= Encoding.GetEncoding("iso-8859-15");
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information = "";
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metadata = new FileSystem();
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var sb = new StringBuilder();
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var besb = new SuperBlock();
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ErrorNumber errno = imagePlugin.ReadSector(0 + partition.Start, out byte[] sbSector);
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if(errno != ErrorNumber.NoError)
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return;
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bool littleEndian;
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besb.magic1 = BigEndianBitConverter.ToUInt32(sbSector, 0x20);
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if(besb.magic1 is BEFS_MAGIC1 or BEFS_CIGAM1) // Magic is at offset
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littleEndian = besb.magic1 == BEFS_CIGAM1;
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else
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{
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errno = imagePlugin.ReadSector(1 + partition.Start, out sbSector);
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if(errno != ErrorNumber.NoError)
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return;
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besb.magic1 = BigEndianBitConverter.ToUInt32(sbSector, 0x20);
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if(besb.magic1 is BEFS_MAGIC1 or BEFS_CIGAM1) // There is a boot sector
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littleEndian = besb.magic1 == BEFS_CIGAM1;
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else if(sbSector.Length >= 0x400)
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{
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errno = imagePlugin.ReadSector(0 + partition.Start, out byte[] temp);
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if(errno != ErrorNumber.NoError)
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return;
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besb.magic1 = BigEndianBitConverter.ToUInt32(temp, 0x220);
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if(besb.magic1 is BEFS_MAGIC1 or BEFS_CIGAM1) // There is a boot sector
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{
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littleEndian = besb.magic1 == BEFS_CIGAM1;
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sbSector = new byte[0x200];
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Array.Copy(temp, 0x200, sbSector, 0, 0x200);
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}
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else
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return;
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}
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else
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return;
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}
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besb = littleEndian ? Marshal.ByteArrayToStructureLittleEndian<SuperBlock>(sbSector)
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: Marshal.ByteArrayToStructureBigEndian<SuperBlock>(sbSector);
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sb.AppendLine(littleEndian ? Localization.Little_endian_BeFS : Localization.Big_endian_BeFS);
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if(besb.magic1 != BEFS_MAGIC1 ||
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besb.fs_byte_order != BEFS_ENDIAN ||
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besb.magic2 != BEFS_MAGIC2 ||
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besb.magic3 != BEFS_MAGIC3 ||
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besb.root_dir_len != 1 ||
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besb.indices_len != 1 ||
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1 << (int)besb.block_shift != besb.block_size)
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{
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sb.AppendLine(Localization.Superblock_seems_corrupt_following_information_may_be_incorrect);
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sb.AppendFormat(Localization.Magic_one_0_Should_be_0x42465331, besb.magic1).AppendLine();
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sb.AppendFormat(Localization.Magic_two_0_Should_be_0xDD121031, besb.magic2).AppendLine();
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sb.AppendFormat(Localization.Magic_three_0_Should_be_0x15B6830E, besb.magic3).AppendLine();
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sb.AppendFormat(Localization.Filesystem_endianness_0_Should_be_0x42494745, besb.fs_byte_order).AppendLine();
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sb.AppendFormat(Localization.Root_folder_i_node_size_0_blocks_Should_be_one, besb.root_dir_len).
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AppendLine();
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sb.AppendFormat(Localization.Indices_i_node_size_0_blocks_Should_be_one, besb.indices_len).AppendLine();
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sb.AppendFormat(Localization.blockshift_0_1_should_be_2, besb.block_shift, 1 << (int)besb.block_shift,
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besb.block_size).AppendLine();
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}
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switch(besb.flags)
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{
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case BEFS_CLEAN:
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sb.AppendLine(besb.log_start == besb.log_end ? Localization.Filesystem_is_clean
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: Localization.Filesystem_is_dirty);
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break;
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case BEFS_DIRTY:
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sb.AppendLine(Localization.Filesystem_is_dirty);
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break;
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default:
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sb.AppendFormat(Localization.Unknown_flags_0_X8, besb.flags).AppendLine();
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break;
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}
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sb.AppendFormat(Localization.Volume_name_0, StringHandlers.CToString(besb.name, encoding)).AppendLine();
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sb.AppendFormat(Localization._0_bytes_per_block, besb.block_size).AppendLine();
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sb.AppendFormat(Localization._0_blocks_in_volume_1_bytes, besb.num_blocks, besb.num_blocks * besb.block_size).
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AppendLine();
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sb.AppendFormat(Localization._0_used_blocks_1_bytes, besb.used_blocks, besb.used_blocks * besb.block_size).
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AppendLine();
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sb.AppendFormat(Localization._0_bytes_per_i_node, besb.inode_size).AppendLine();
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sb.AppendFormat(Localization._0_blocks_per_allocation_group_1_bytes, besb.blocks_per_ag,
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besb.blocks_per_ag * besb.block_size).AppendLine();
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sb.AppendFormat(Localization._0_allocation_groups_in_volume, besb.num_ags).AppendLine();
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sb.AppendFormat(Localization.Journal_resides_in_block_0_of_allocation_group_1_and_runs_for_2_blocks_3_bytes,
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besb.log_blocks_start, besb.log_blocks_ag, besb.log_blocks_len,
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besb.log_blocks_len * besb.block_size).AppendLine();
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sb.AppendFormat(Localization.Journal_starts_in_byte_0_and_ends_in_byte_1, besb.log_start, besb.log_end).
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AppendLine();
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sb.
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AppendFormat(Localization.Root_folder_s_i_node_resides_in_block_0_of_allocation_group_1_and_runs_for_2_blocks_3_bytes,
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besb.root_dir_start, besb.root_dir_ag, besb.root_dir_len, besb.root_dir_len * besb.block_size).
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AppendLine();
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sb.
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AppendFormat(Localization.Indices_i_node_resides_in_block_0_of_allocation_group_1_and_runs_for_2_blocks_3_bytes,
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besb.indices_start, besb.indices_ag, besb.indices_len, besb.indices_len * besb.block_size).
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AppendLine();
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information = sb.ToString();
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metadata = new FileSystem
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{
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Clusters = (ulong)besb.num_blocks,
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ClusterSize = besb.block_size,
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Dirty = besb.flags == BEFS_DIRTY,
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FreeClusters = (ulong)(besb.num_blocks - besb.used_blocks),
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Type = FS_TYPE,
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VolumeName = StringHandlers.CToString(besb.name, encoding)
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};
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}
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} |