mirror of
https://github.com/aaru-dps/Aaru.git
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216 lines
9.0 KiB
C#
216 lines
9.0 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 : Extent File System 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 © 2011-2025 Natalia Portillo
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// ****************************************************************************/
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using System;
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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 Aaru.Logging;
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using Partition = Aaru.CommonTypes.Partition;
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namespace Aaru.Filesystems;
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/// <inheritdoc />
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/// <summary>Implements identification for the SGI Extent FileSystem</summary>
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public sealed partial class EFS
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{
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#region IFilesystem Members
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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(imagePlugin.Info.SectorSize < 512) return false;
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// Misaligned
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if(imagePlugin.Info.MetadataMediaType == MetadataMediaType.OpticalDisc)
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{
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uint sbSize = (uint)((Marshal.SizeOf<Superblock>() + 0x200) / imagePlugin.Info.SectorSize);
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if((Marshal.SizeOf<Superblock>() + 0x200) % imagePlugin.Info.SectorSize != 0) sbSize++;
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ErrorNumber errno = imagePlugin.ReadSectors(partition.Start, sbSize, out byte[] sector);
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if(errno != ErrorNumber.NoError) return false;
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if(sector.Length < Marshal.SizeOf<Superblock>()) return false;
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byte[] sbpiece = new byte[Marshal.SizeOf<Superblock>()];
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Array.Copy(sector, 0x200, sbpiece, 0, Marshal.SizeOf<Superblock>());
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Superblock sb = Marshal.ByteArrayToStructureBigEndianGenerated<Superblock>(sbpiece);
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AaruLogging.Debug(MODULE_NAME,
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Localization.magic_at_0_equals_1_expected_2_or_3,
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0x200,
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sb.sb_magic,
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EFS_MAGIC,
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EFS_MAGIC_NEW);
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if(sb.sb_magic is EFS_MAGIC or EFS_MAGIC_NEW) return true;
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}
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else
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{
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uint sbSize = (uint)(Marshal.SizeOf<Superblock>() / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf<Superblock>() % imagePlugin.Info.SectorSize != 0) sbSize++;
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ErrorNumber errno = imagePlugin.ReadSectors(partition.Start + 1, sbSize, out byte[] sector);
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if(errno != ErrorNumber.NoError) return false;
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if(sector.Length < Marshal.SizeOf<Superblock>()) return false;
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Superblock sb = Marshal.ByteArrayToStructureBigEndianGenerated<Superblock>(sector);
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AaruLogging.Debug(MODULE_NAME,
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Localization.magic_at_0_equals_1_expected_2_or_3,
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1,
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sb.sb_magic,
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EFS_MAGIC,
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EFS_MAGIC_NEW);
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if(sb.sb_magic is EFS_MAGIC or EFS_MAGIC_NEW) return true;
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}
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return false;
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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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if(imagePlugin.Info.SectorSize < 512) return;
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Superblock efsSb;
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// Misaligned
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if(imagePlugin.Info.MetadataMediaType == MetadataMediaType.OpticalDisc)
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{
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uint sbSize = (uint)((Marshal.SizeOf<Superblock>() + 0x400) / imagePlugin.Info.SectorSize);
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if((Marshal.SizeOf<Superblock>() + 0x400) % imagePlugin.Info.SectorSize != 0) sbSize++;
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ErrorNumber errno = imagePlugin.ReadSectors(partition.Start, sbSize, out byte[] sector);
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if(errno != ErrorNumber.NoError) return;
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if(sector.Length < Marshal.SizeOf<Superblock>()) return;
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byte[] sbpiece = new byte[Marshal.SizeOf<Superblock>()];
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Array.Copy(sector, 0x200, sbpiece, 0, Marshal.SizeOf<Superblock>());
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efsSb = Marshal.ByteArrayToStructureBigEndianGenerated<Superblock>(sbpiece);
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AaruLogging.Debug(MODULE_NAME,
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Localization.magic_at_0_X3_equals_1_expected_2_or_3,
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0x200,
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efsSb.sb_magic,
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EFS_MAGIC,
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EFS_MAGIC_NEW);
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}
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else
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{
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uint sbSize = (uint)(Marshal.SizeOf<Superblock>() / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf<Superblock>() % imagePlugin.Info.SectorSize != 0) sbSize++;
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ErrorNumber errno = imagePlugin.ReadSectors(partition.Start + 1, sbSize, out byte[] sector);
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if(errno != ErrorNumber.NoError) return;
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if(sector.Length < Marshal.SizeOf<Superblock>()) return;
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efsSb = Marshal.ByteArrayToStructureBigEndianGenerated<Superblock>(sector);
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AaruLogging.Debug(MODULE_NAME,
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Localization.magic_at_0_equals_1_expected_2_or_3,
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1,
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efsSb.sb_magic,
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EFS_MAGIC,
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EFS_MAGIC_NEW);
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}
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if(efsSb.sb_magic != EFS_MAGIC && efsSb.sb_magic != EFS_MAGIC_NEW) return;
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var sb = new StringBuilder();
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sb.AppendLine(Localization.SGI_extent_filesystem);
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if(efsSb.sb_magic == EFS_MAGIC_NEW) sb.AppendLine(Localization.New_version);
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sb.AppendFormat(Localization.Filesystem_size_0_basic_blocks, efsSb.sb_size).AppendLine();
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sb.AppendFormat(Localization.First_cylinder_group_starts_at_block_0, efsSb.sb_firstcg).AppendLine();
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sb.AppendFormat(Localization.Cylinder_group_size_0_basic_blocks, efsSb.sb_cgfsize).AppendLine();
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sb.AppendFormat(Localization._0_inodes_per_cylinder_group, efsSb.sb_cgisize).AppendLine();
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sb.AppendFormat(Localization._0_sectors_per_track, efsSb.sb_sectors).AppendLine();
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sb.AppendFormat(Localization._0_heads_per_cylinder, efsSb.sb_heads).AppendLine();
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sb.AppendFormat(Localization._0_cylinder_groups, efsSb.sb_ncg).AppendLine();
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sb.AppendFormat(Localization.Volume_created_on_0, DateHandlers.UnixToDateTime(efsSb.sb_time)).AppendLine();
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sb.AppendFormat(Localization._0_bytes_on_bitmap, efsSb.sb_bmsize).AppendLine();
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sb.AppendFormat(Localization._0_free_blocks, efsSb.sb_tfree).AppendLine();
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sb.AppendFormat(Localization._0_free_inodes, efsSb.sb_tinode).AppendLine();
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if(efsSb.sb_bmblock > 0) sb.AppendFormat(Localization.Bitmap_resides_at_block_0, efsSb.sb_bmblock).AppendLine();
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if(efsSb.sb_replsb > 0)
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sb.AppendFormat(Localization.Replacement_superblock_resides_at_block_0, efsSb.sb_replsb).AppendLine();
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if(efsSb.sb_lastinode > 0)
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sb.AppendFormat(Localization.Last_inode_allocated_0, efsSb.sb_lastinode).AppendLine();
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if(efsSb.sb_dirty > 0) sb.AppendLine(Localization.Volume_is_dirty);
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sb.AppendFormat(Localization.Checksum_0_X8, efsSb.sb_checksum).AppendLine();
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sb.AppendFormat(Localization.Volume_name_0, StringHandlers.CToString(efsSb.sb_fname, encoding)).AppendLine();
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sb.AppendFormat(Localization.Volume_pack_0, StringHandlers.CToString(efsSb.sb_fpack, encoding)).AppendLine();
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information = sb.ToString();
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metadata = new FileSystem
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{
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Type = FS_TYPE,
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ClusterSize = 512,
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Clusters = (ulong)efsSb.sb_size,
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FreeClusters = (ulong)efsSb.sb_tfree,
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Dirty = efsSb.sb_dirty > 0,
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VolumeName = StringHandlers.CToString(efsSb.sb_fname, encoding),
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VolumeSerial = $"{efsSb.sb_checksum:X8}",
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CreationDate = DateHandlers.UnixToDateTime(efsSb.sb_time)
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};
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}
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#endregion
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} |