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251 lines
12 KiB
C#
251 lines
12 KiB
C#
/***************************************************************************
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FileSystem identifier and checker
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----------------------------------------------------------------------------
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Filename : BFS.cs
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Version : 1.0
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Author(s) : Natalia Portillo
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Component : Filesystem plugins
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Revision : $Revision$
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Last change by : $Author$
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Date : $Date$
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--[ Description ] ----------------------------------------------------------
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Identifies BeOS' filesystem and shows information.
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--[ License ] --------------------------------------------------------------
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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----------------------------------------------------------------------------
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Copyright (C) 2011-2014 Claunia.com
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****************************************************************************/
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//$Id$
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using System;
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using System.Text;
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using FileSystemIDandChk;
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// Information from Practical Filesystem Design, ISBN 1-55860-497-9
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namespace FileSystemIDandChk.Plugins
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{
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class BeFS : Plugin
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{
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// Little endian constants (that is, as read by .NET :p)
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const UInt32 BEFS_MAGIC1 = 0x42465331;
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const UInt32 BEFS_MAGIC2 = 0xDD121031;
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const UInt32 BEFS_MAGIC3 = 0x15B6830E;
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const UInt32 BEFS_ENDIAN = 0x42494745;
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// Big endian constants
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const UInt32 BEFS_CIGAM1 = 0x31534642;
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const UInt32 BEFS_NAIDNE = 0x45474942;
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// Common constants
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const UInt32 BEFS_CLEAN = 0x434C454E;
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const UInt32 BEFS_DIRTY = 0x44495254;
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public BeFS(PluginBase Core)
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{
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Name = "Be Filesystem";
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PluginUUID = new Guid("dc8572b3-b6ad-46e4-8de9-cbe123ff6672");
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}
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public override bool Identify(ImagePlugins.ImagePlugin imagePlugin, ulong partitionOffset)
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{
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UInt32 magic;
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UInt32 magic_be;
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byte[] sb_sector = imagePlugin.ReadSector(0 + partitionOffset);
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magic = BitConverter.ToUInt32(sb_sector, 0x20);
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magic_be = BigEndianBitConverter.ToUInt32(sb_sector, 0x20);
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if (magic == BEFS_MAGIC1 || magic_be == BEFS_MAGIC1)
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return true;
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sb_sector = imagePlugin.ReadSector(1 + partitionOffset);
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magic = BitConverter.ToUInt32(sb_sector, 0x20);
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magic_be = BigEndianBitConverter.ToUInt32(sb_sector, 0x20);
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if (magic == BEFS_MAGIC1 || magic_be == BEFS_MAGIC1)
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return true;
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return false;
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}
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public override void GetInformation(ImagePlugins.ImagePlugin imagePlugin, ulong partitionOffset, out string information)
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{
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information = "";
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byte[] name_bytes = new byte[32];
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StringBuilder sb = new StringBuilder();
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BeSuperBlock besb = new BeSuperBlock();
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byte[] sb_sector = imagePlugin.ReadSector(0 + partitionOffset);
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BigEndianBitConverter.IsLittleEndian = true; // Default for little-endian
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besb.magic1 = BigEndianBitConverter.ToUInt32(sb_sector, 0x20);
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if (besb.magic1 == BEFS_MAGIC1 || besb.magic1 == BEFS_CIGAM1) // Magic is at offset
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{
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BigEndianBitConverter.IsLittleEndian &= besb.magic1 != BEFS_CIGAM1;
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}
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else
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{
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sb_sector = imagePlugin.ReadSector(1 + partitionOffset);
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besb.magic1 = BigEndianBitConverter.ToUInt32(sb_sector, 0x20);
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if (besb.magic1 == BEFS_MAGIC1 || besb.magic1 == BEFS_CIGAM1) // There is a boot sector
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{
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BigEndianBitConverter.IsLittleEndian &= besb.magic1 != BEFS_CIGAM1;
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}
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else
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return;
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}
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Array.Copy(sb_sector, 0x000, name_bytes, 0, 0x20);
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besb.name = StringHandlers.CToString(name_bytes);
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besb.magic1 = BigEndianBitConverter.ToUInt32(sb_sector, 0x20);
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besb.fs_byte_order = BigEndianBitConverter.ToUInt32(sb_sector, 0x20);
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besb.block_size = BigEndianBitConverter.ToUInt32(sb_sector, 0x20);
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besb.block_shift = BigEndianBitConverter.ToUInt32(sb_sector, 0x20);
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besb.num_blocks = BigEndianBitConverter.ToInt64(sb_sector, 0x20);
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besb.used_blocks = BigEndianBitConverter.ToInt64(sb_sector, 0x20);
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besb.inode_size = BigEndianBitConverter.ToInt32(sb_sector, 0x20);
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besb.magic2 = BigEndianBitConverter.ToUInt32(sb_sector, 0x20);
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besb.blocks_per_ag = BigEndianBitConverter.ToInt32(sb_sector, 0x20);
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besb.ag_shift = BigEndianBitConverter.ToInt32(sb_sector, 0x20);
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besb.num_ags = BigEndianBitConverter.ToInt32(sb_sector, 0x20);
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besb.flags = BigEndianBitConverter.ToUInt32(sb_sector, 0x20);
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besb.log_blocks_ag = BigEndianBitConverter.ToInt32(sb_sector, 0x20);
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besb.log_blocks_start = BigEndianBitConverter.ToUInt16(sb_sector, 0x20);
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besb.log_blocks_len = BigEndianBitConverter.ToUInt16(sb_sector, 0x20);
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besb.log_start = BigEndianBitConverter.ToInt64(sb_sector, 0x20);
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besb.log_end = BigEndianBitConverter.ToInt64(sb_sector, 0x20);
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besb.magic3 = BigEndianBitConverter.ToUInt32(sb_sector, 0x20);
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besb.root_dir_ag = BigEndianBitConverter.ToInt32(sb_sector, 0x20);
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besb.root_dir_start = BigEndianBitConverter.ToUInt16(sb_sector, 0x20);
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besb.root_dir_len = BigEndianBitConverter.ToUInt16(sb_sector, 0x20);
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besb.indices_ag = BigEndianBitConverter.ToInt32(sb_sector, 0x20);
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besb.indices_start = BigEndianBitConverter.ToUInt16(sb_sector, 0x20);
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besb.indices_len = BigEndianBitConverter.ToUInt16(sb_sector, 0x20);
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if (!BigEndianBitConverter.IsLittleEndian) // Big-endian filesystem
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sb.AppendLine("Big-endian BeFS");
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else
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sb.AppendLine("Little-endian BeFS");
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if (besb.magic1 != BEFS_MAGIC1 || besb.fs_byte_order != BEFS_ENDIAN ||
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besb.magic2 != BEFS_MAGIC2 || besb.magic3 != BEFS_MAGIC3 ||
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besb.root_dir_len != 1 || 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("Superblock seems corrupt, following information may be incorrect");
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sb.AppendFormat("Magic 1: 0x{0:X8} (Should be 0x42465331)", besb.magic1).AppendLine();
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sb.AppendFormat("Magic 2: 0x{0:X8} (Should be 0xDD121031)", besb.magic2).AppendLine();
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sb.AppendFormat("Magic 3: 0x{0:X8} (Should be 0x15B6830E)", besb.magic3).AppendLine();
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sb.AppendFormat("Filesystem endianness: 0x{0:X8} (Should be 0x42494745)", besb.fs_byte_order).AppendLine();
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sb.AppendFormat("Root folder's i-node size: {0} blocks (Should be 1)", besb.root_dir_len).AppendLine();
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sb.AppendFormat("Indices' i-node size: {0} blocks (Should be 1)", besb.indices_len).AppendLine();
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sb.AppendFormat("1 << block_shift == block_size => 1 << {0} == {1} (Should be {2})", besb.block_shift,
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1 << (int)besb.block_shift, besb.block_size).AppendLine();
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}
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if (besb.flags == BEFS_CLEAN)
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{
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if (besb.log_start == besb.log_end)
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sb.AppendLine("Filesystem is clean");
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else
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sb.AppendLine("Filesystem is dirty");
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}
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else if (besb.flags == BEFS_DIRTY)
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sb.AppendLine("Filesystem is dirty");
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else
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sb.AppendFormat("Unknown flags: {0:X8}", besb.flags).AppendLine();
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sb.AppendFormat("Volume name: {0}", besb.name).AppendLine();
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sb.AppendFormat("{0} bytes per block", besb.block_size).AppendLine();
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sb.AppendFormat("{0} blocks in volume ({1} bytes)", besb.num_blocks, besb.num_blocks * besb.block_size).AppendLine();
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sb.AppendFormat("{0} used blocks ({1} bytes)", besb.used_blocks, besb.used_blocks * besb.block_size).AppendLine();
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sb.AppendFormat("{0} bytes per i-node", besb.inode_size).AppendLine();
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sb.AppendFormat("{0} blocks per allocation group ({1} bytes)", besb.blocks_per_ag, besb.blocks_per_ag * besb.block_size).AppendLine();
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sb.AppendFormat("{0} allocation groups in volume", besb.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)", besb.log_blocks_start,
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besb.log_blocks_ag, besb.log_blocks_len, besb.log_blocks_len * besb.block_size).AppendLine();
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sb.AppendFormat("Journal starts in byte {0} and ends in byte {1}", besb.log_start, besb.log_end).AppendLine();
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sb.AppendFormat("Root folder's i-node resides in block {0} of allocation group {1} and runs for {2} blocks ({3} bytes)", besb.root_dir_start,
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besb.root_dir_ag, besb.root_dir_len, besb.root_dir_len * besb.block_size).AppendLine();
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sb.AppendFormat("Indices' i-node resides in block {0} of allocation group {1} and runs for {2} blocks ({3} bytes)", besb.indices_start,
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besb.indices_ag, besb.indices_len, besb.indices_len * besb.block_size).AppendLine();
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information = sb.ToString();
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}
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struct BeSuperBlock
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{
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public string name;
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// 0x000, Volume name, 32 bytes
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public UInt32 magic1;
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// 0x020, "BFS1", 0x42465331
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public UInt32 fs_byte_order;
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// 0x024, "BIGE", 0x42494745
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public UInt32 block_size;
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// 0x028, Bytes per block
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public UInt32 block_shift;
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// 0x02C, 1 << block_shift == block_size
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public Int64 num_blocks;
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// 0x030, Blocks in volume
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public Int64 used_blocks;
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// 0x038, Used blocks in volume
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public Int32 inode_size;
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// 0x040, Bytes per inode
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public UInt32 magic2;
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// 0x044, 0xDD121031
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public Int32 blocks_per_ag;
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// 0x048, Blocks per allocation group
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public Int32 ag_shift;
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// 0x04C, 1 << ag_shift == blocks_per_ag
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public Int32 num_ags;
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// 0x050, Allocation groups in volume
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public UInt32 flags;
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// 0x054, 0x434c454e if clean, 0x44495254 if dirty
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public Int32 log_blocks_ag;
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// 0x058, Allocation group of journal
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public UInt16 log_blocks_start;
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// 0x05C, Start block of journal, inside ag
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public UInt16 log_blocks_len;
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// 0x05E, Length in blocks of journal, inside ag
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public Int64 log_start;
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// 0x060, Start of journal
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public Int64 log_end;
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// 0x068, End of journal
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public UInt32 magic3;
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// 0x070, 0x15B6830E
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public Int32 root_dir_ag;
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// 0x074, Allocation group where root folder's i-node resides
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public UInt16 root_dir_start;
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// 0x078, Start in ag of root folder's i-node
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public UInt16 root_dir_len;
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// 0x07A, As this is part of inode_addr, this is 1
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public Int32 indices_ag;
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// 0x07C, Allocation group where indices' i-node resides
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public UInt16 indices_start;
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// 0x080, Start in ag of indices' i-node
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public UInt16 indices_len;
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// 0x082, As this is part of inode_addr, this is 1
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}
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}
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} |