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216 lines
11 KiB
C#
216 lines
11 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : Atheos.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Atheos filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the Atheos filesystem and shows information.
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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 © 2011-2019 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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using DiscImageChef.CommonTypes;
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using DiscImageChef.CommonTypes.Interfaces;
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using Schemas;
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namespace DiscImageChef.Filesystems
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{
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public class AtheOS : IFilesystem
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{
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// Little endian constants (that is, as read by .NET :p)
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const uint AFS_MAGIC1 = 0x41465331;
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const uint AFS_MAGIC2 = 0xDD121031;
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const uint AFS_MAGIC3 = 0x15B6830E;
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// Common constants
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const uint AFS_SUPERBLOCK_SIZE = 1024;
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const uint AFS_BOOTBLOCK_SIZE = AFS_SUPERBLOCK_SIZE;
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public FileSystemType XmlFsType { get; private set; }
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public Encoding Encoding { get; private set; }
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public string Name => "AtheOS Filesystem";
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public Guid Id => new Guid("AAB2C4F1-DC07-49EE-A948-576CC51B58C5");
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public string Author => "Natalia Portillo";
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public bool Identify(IMediaImage imagePlugin, Partition partition)
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{
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ulong sector = AFS_BOOTBLOCK_SIZE / imagePlugin.Info.SectorSize;
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uint offset = AFS_BOOTBLOCK_SIZE % imagePlugin.Info.SectorSize;
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uint run = 1;
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if(imagePlugin.Info.SectorSize < AFS_SUPERBLOCK_SIZE)
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run = AFS_SUPERBLOCK_SIZE / imagePlugin.Info.SectorSize;
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if(sector + partition.Start >= partition.End) return false;
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byte[] tmp = imagePlugin.ReadSectors(sector + partition.Start, run);
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byte[] sbSector = new byte[AFS_SUPERBLOCK_SIZE];
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Array.Copy(tmp, offset, sbSector, 0, AFS_SUPERBLOCK_SIZE);
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uint magic = BitConverter.ToUInt32(sbSector, 0x20);
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return magic == AFS_MAGIC1;
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}
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public void GetInformation(IMediaImage imagePlugin, Partition partition, out string information,
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Encoding encoding)
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{
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Encoding = encoding ?? Encoding.GetEncoding("iso-8859-15");
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information = "";
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StringBuilder sb = new StringBuilder();
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ulong sector = AFS_BOOTBLOCK_SIZE / imagePlugin.Info.SectorSize;
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uint offset = AFS_BOOTBLOCK_SIZE % imagePlugin.Info.SectorSize;
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uint run = 1;
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if(imagePlugin.Info.SectorSize < AFS_SUPERBLOCK_SIZE)
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run = AFS_SUPERBLOCK_SIZE / imagePlugin.Info.SectorSize;
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byte[] tmp = imagePlugin.ReadSectors(sector + partition.Start, run);
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byte[] sbSector = new byte[AFS_SUPERBLOCK_SIZE];
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Array.Copy(tmp, offset, sbSector, 0, AFS_SUPERBLOCK_SIZE);
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AtheosSuperBlock afsSb = Helpers.Marshal.ByteArrayToStructureLittleEndian<AtheosSuperBlock>(sbSector);
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sb.AppendLine("Atheos filesystem");
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if(afsSb.flags == 1) sb.AppendLine("Filesystem is read-only");
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sb.AppendFormat("Volume name: {0}", StringHandlers.CToString(afsSb.name, Encoding)).AppendLine();
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sb.AppendFormat("{0} bytes per block", afsSb.block_size).AppendLine();
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sb.AppendFormat("{0} blocks in volume ({1} bytes)", afsSb.num_blocks, afsSb.num_blocks * afsSb.block_size)
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.AppendLine();
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sb.AppendFormat("{0} used blocks ({1} bytes)", afsSb.used_blocks, afsSb.used_blocks * afsSb.block_size)
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.AppendLine();
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sb.AppendFormat("{0} bytes per i-node", afsSb.inode_size).AppendLine();
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sb.AppendFormat("{0} blocks per allocation group ({1} bytes)", afsSb.blocks_per_ag,
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afsSb.blocks_per_ag * afsSb.block_size).AppendLine();
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sb.AppendFormat("{0} allocation groups in volume", afsSb.num_ags).AppendLine();
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sb.AppendFormat("Journal resides in block {0} of allocation group {1} and runs for {2} blocks ({3} bytes)",
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afsSb.log_blocks_start, afsSb.log_blocks_ag, afsSb.log_blocks_len,
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afsSb.log_blocks_len * afsSb.block_size).AppendLine();
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sb.AppendFormat("Journal starts in byte {0} and has {1} bytes in {2} blocks", afsSb.log_start,
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afsSb.log_size, afsSb.log_valid_blocks).AppendLine();
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sb
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.AppendFormat("Root folder's i-node resides in block {0} of allocation group {1} and runs for {2} blocks ({3} bytes)",
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afsSb.root_dir_start, afsSb.root_dir_ag, afsSb.root_dir_len,
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afsSb.root_dir_len * afsSb.block_size).AppendLine();
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sb
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.AppendFormat("Directory containing files scheduled for deletion's i-node resides in block {0} of allocation group {1} and runs for {2} blocks ({3} bytes)",
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afsSb.deleted_start, afsSb.deleted_ag, afsSb.deleted_len,
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afsSb.deleted_len * afsSb.block_size).AppendLine();
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sb
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.AppendFormat("Indices' i-node resides in block {0} of allocation group {1} and runs for {2} blocks ({3} bytes)",
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afsSb.indices_start, afsSb.indices_ag, afsSb.indices_len,
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afsSb.indices_len * afsSb.block_size).AppendLine();
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sb.AppendFormat("{0} blocks for bootloader ({1} bytes)", afsSb.boot_size,
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afsSb.boot_size * afsSb.block_size).AppendLine();
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information = sb.ToString();
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XmlFsType = new FileSystemType
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{
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Clusters = afsSb.num_blocks,
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ClusterSize = (int)afsSb.block_size,
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Dirty = false,
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FreeClusters = afsSb.num_blocks - afsSb.used_blocks,
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FreeClustersSpecified = true,
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Type = "AtheOS filesystem",
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VolumeName = StringHandlers.CToString(afsSb.name, Encoding)
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};
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}
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/// <summary>
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/// Be superblock
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/// </summary>
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct AtheosSuperBlock
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{
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/// <summary>0x000, Volume name, 32 bytes</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
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public byte[] name;
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/// <summary>0x020, "AFS1", 0x41465331</summary>
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public uint magic1;
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/// <summary>0x024, "BIGE", 0x42494745</summary>
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public uint fs_byte_order;
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/// <summary>0x028, Bytes per block</summary>
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public uint block_size;
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/// <summary>0x02C, 1 << block_shift == block_size</summary>
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public uint block_shift;
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/// <summary>0x030, Blocks in volume</summary>
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public long num_blocks;
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/// <summary>0x038, Used blocks in volume</summary>
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public long used_blocks;
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/// <summary>0x040, Bytes per inode</summary>
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public int inode_size;
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/// <summary>0x044, 0xDD121031</summary>
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public uint magic2;
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/// <summary>0x048, Blocks per allocation group</summary>
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public int blocks_per_ag;
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/// <summary>0x04C, 1 << ag_shift == blocks_per_ag</summary>
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public int ag_shift;
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/// <summary>0x050, Allocation groups in volume</summary>
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public int num_ags;
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/// <summary>0x054, 0x434c454e if clean, 0x44495254 if dirty</summary>
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public uint flags;
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/// <summary>0x058, Allocation group of journal</summary>
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public int log_blocks_ag;
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/// <summary>0x05C, Start block of journal, inside ag</summary>
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public ushort log_blocks_start;
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/// <summary>0x05E, Length in blocks of journal, inside ag</summary>
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public ushort log_blocks_len;
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/// <summary>0x060, Start of journal</summary>
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public long log_start;
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/// <summary>0x068, Valid block logs</summary>
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public int log_valid_blocks;
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/// <summary>0x06C, Log size</summary>
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public int log_size;
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/// <summary>0x070, 0x15B6830E</summary>
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public uint magic3;
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/// <summary>0x074, Allocation group where root folder's i-node resides</summary>
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public int root_dir_ag;
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/// <summary>0x078, Start in ag of root folder's i-node</summary>
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public ushort root_dir_start;
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/// <summary>0x07A, As this is part of inode_addr, this is 1</summary>
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public ushort root_dir_len;
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/// <summary>0x07C, Allocation group where pending-delete-files' i-node resides</summary>
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public int deleted_ag;
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/// <summary>0x080, Start in ag of pending-delete-files' i-node</summary>
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public ushort deleted_start;
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/// <summary>0x082, As this is part of inode_addr, this is 1</summary>
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public ushort deleted_len;
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/// <summary>0x084, Allocation group where indices' i-node resides</summary>
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public int indices_ag;
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/// <summary>0x088, Start in ag of indices' i-node</summary>
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public ushort indices_start;
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/// <summary>0x08A, As this is part of inode_addr, this is 1</summary>
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public ushort indices_len;
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/// <summary>0x08C, Size of bootloader</summary>
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public int boot_size;
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}
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}
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} |