/*************************************************************************** The Disc Image Chef ---------------------------------------------------------------------------- Filename : BFS.cs Version : 1.0 Author(s) : Natalia Portillo Component : Filesystem plugins Revision : $Revision$ Last change by : $Author$ Date : $Date$ --[ Description ] ---------------------------------------------------------- Identifies BeOS' filesystem and shows information. --[ License ] -------------------------------------------------------------- This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . ---------------------------------------------------------------------------- Copyright (C) 2011-2014 Claunia.com ****************************************************************************/ //$Id$ using System; using System.Text; using DiscImageChef; // Information from Practical Filesystem Design, ISBN 1-55860-497-9 namespace DiscImageChef.Plugins { class BeFS : Plugin { // Little endian constants (that is, as read by .NET :p) const UInt32 BEFS_MAGIC1 = 0x42465331; const UInt32 BEFS_MAGIC2 = 0xDD121031; const UInt32 BEFS_MAGIC3 = 0x15B6830E; const UInt32 BEFS_ENDIAN = 0x42494745; // Big endian constants const UInt32 BEFS_CIGAM1 = 0x31534642; const UInt32 BEFS_NAIDNE = 0x45474942; // Common constants const UInt32 BEFS_CLEAN = 0x434C454E; const UInt32 BEFS_DIRTY = 0x44495254; public BeFS() { Name = "Be Filesystem"; PluginUUID = new Guid("dc8572b3-b6ad-46e4-8de9-cbe123ff6672"); } public override bool Identify(ImagePlugins.ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd) { if((2 + partitionStart) >= imagePlugin.GetSectors()) return false; UInt32 magic; UInt32 magic_be; byte[] sb_sector = imagePlugin.ReadSector(0 + partitionStart); magic = BitConverter.ToUInt32(sb_sector, 0x20); magic_be = BigEndianBitConverter.ToUInt32(sb_sector, 0x20); if(magic == BEFS_MAGIC1 || magic_be == BEFS_MAGIC1) return true; if(sb_sector.Length >= 0x400) { magic = BitConverter.ToUInt32(sb_sector, 0x220); magic_be = BigEndianBitConverter.ToUInt32(sb_sector, 0x220); } if(magic == BEFS_MAGIC1 || magic_be == BEFS_MAGIC1) return true; sb_sector = imagePlugin.ReadSector(1 + partitionStart); magic = BitConverter.ToUInt32(sb_sector, 0x20); magic_be = BigEndianBitConverter.ToUInt32(sb_sector, 0x20); if(magic == BEFS_MAGIC1 || magic_be == BEFS_MAGIC1) return true; return false; } public override void GetInformation(ImagePlugins.ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd, out string information) { information = ""; byte[] name_bytes = new byte[32]; StringBuilder sb = new StringBuilder(); BeSuperBlock besb = new BeSuperBlock(); byte[] sb_sector = imagePlugin.ReadSector(0 + partitionStart); BigEndianBitConverter.IsLittleEndian = true; // Default for little-endian besb.magic1 = BigEndianBitConverter.ToUInt32(sb_sector, 0x20); if(besb.magic1 == BEFS_MAGIC1 || besb.magic1 == BEFS_CIGAM1) // Magic is at offset { BigEndianBitConverter.IsLittleEndian &= besb.magic1 != BEFS_CIGAM1; } else { sb_sector = imagePlugin.ReadSector(1 + partitionStart); besb.magic1 = BigEndianBitConverter.ToUInt32(sb_sector, 0x20); if(besb.magic1 == BEFS_MAGIC1 || besb.magic1 == BEFS_CIGAM1) // There is a boot sector { BigEndianBitConverter.IsLittleEndian &= besb.magic1 != BEFS_CIGAM1; } else if(sb_sector.Length >= 0x400) { byte[] temp = imagePlugin.ReadSector(0 + partitionStart); besb.magic1 = BigEndianBitConverter.ToUInt32(temp, 0x220); if(besb.magic1 == BEFS_MAGIC1 || besb.magic1 == BEFS_CIGAM1) // There is a boot sector { BigEndianBitConverter.IsLittleEndian &= besb.magic1 != BEFS_CIGAM1; sb_sector = new byte[0x200]; Array.Copy(temp, 0x200, sb_sector, 0, 0x200); } else return; } else return; } Array.Copy(sb_sector, 0x000, name_bytes, 0, 0x20); besb.name = StringHandlers.CToString(name_bytes); besb.magic1 = BigEndianBitConverter.ToUInt32(sb_sector, 0x20); besb.fs_byte_order = BigEndianBitConverter.ToUInt32(sb_sector, 0x24); besb.block_size = BigEndianBitConverter.ToUInt32(sb_sector, 0x28); besb.block_shift = BigEndianBitConverter.ToUInt32(sb_sector, 0x2C); besb.num_blocks = BigEndianBitConverter.ToInt64(sb_sector, 0x30); besb.used_blocks = BigEndianBitConverter.ToInt64(sb_sector, 0x38); besb.inode_size = BigEndianBitConverter.ToInt32(sb_sector, 0x40); besb.magic2 = BigEndianBitConverter.ToUInt32(sb_sector, 0x44); besb.blocks_per_ag = BigEndianBitConverter.ToInt32(sb_sector, 0x48); besb.ag_shift = BigEndianBitConverter.ToInt32(sb_sector, 0x4C); besb.num_ags = BigEndianBitConverter.ToInt32(sb_sector, 0x50); besb.flags = BigEndianBitConverter.ToUInt32(sb_sector, 0x54); besb.log_blocks_ag = BigEndianBitConverter.ToInt32(sb_sector, 0x58); besb.log_blocks_start = BigEndianBitConverter.ToUInt16(sb_sector, 0x5C); besb.log_blocks_len = BigEndianBitConverter.ToUInt16(sb_sector, 0x5E); besb.log_start = BigEndianBitConverter.ToInt64(sb_sector, 0x60); besb.log_end = BigEndianBitConverter.ToInt64(sb_sector, 0x68); besb.magic3 = BigEndianBitConverter.ToUInt32(sb_sector, 0x70); besb.root_dir_ag = BigEndianBitConverter.ToInt32(sb_sector, 0x74); besb.root_dir_start = BigEndianBitConverter.ToUInt16(sb_sector, 0x78); besb.root_dir_len = BigEndianBitConverter.ToUInt16(sb_sector, 0x7A); besb.indices_ag = BigEndianBitConverter.ToInt32(sb_sector, 0x7C); besb.indices_start = BigEndianBitConverter.ToUInt16(sb_sector, 0x80); besb.indices_len = BigEndianBitConverter.ToUInt16(sb_sector, 0x82); if(!BigEndianBitConverter.IsLittleEndian) // Big-endian filesystem sb.AppendLine("Little-endian BeFS"); else sb.AppendLine("Big-endian BeFS"); if(besb.magic1 != BEFS_MAGIC1 || besb.fs_byte_order != BEFS_ENDIAN || besb.magic2 != BEFS_MAGIC2 || besb.magic3 != BEFS_MAGIC3 || besb.root_dir_len != 1 || besb.indices_len != 1 || (1 << (int)besb.block_shift) != besb.block_size) { sb.AppendLine("Superblock seems corrupt, following information may be incorrect"); sb.AppendFormat("Magic 1: 0x{0:X8} (Should be 0x42465331)", besb.magic1).AppendLine(); sb.AppendFormat("Magic 2: 0x{0:X8} (Should be 0xDD121031)", besb.magic2).AppendLine(); sb.AppendFormat("Magic 3: 0x{0:X8} (Should be 0x15B6830E)", besb.magic3).AppendLine(); sb.AppendFormat("Filesystem endianness: 0x{0:X8} (Should be 0x42494745)", besb.fs_byte_order).AppendLine(); sb.AppendFormat("Root folder's i-node size: {0} blocks (Should be 1)", besb.root_dir_len).AppendLine(); sb.AppendFormat("Indices' i-node size: {0} blocks (Should be 1)", besb.indices_len).AppendLine(); sb.AppendFormat("1 << block_shift == block_size => 1 << {0} == {1} (Should be {2})", besb.block_shift, 1 << (int)besb.block_shift, besb.block_size).AppendLine(); } if(besb.flags == BEFS_CLEAN) { if(besb.log_start == besb.log_end) sb.AppendLine("Filesystem is clean"); else sb.AppendLine("Filesystem is dirty"); } else if(besb.flags == BEFS_DIRTY) sb.AppendLine("Filesystem is dirty"); else sb.AppendFormat("Unknown flags: {0:X8}", besb.flags).AppendLine(); sb.AppendFormat("Volume name: {0}", besb.name).AppendLine(); sb.AppendFormat("{0} bytes per block", besb.block_size).AppendLine(); sb.AppendFormat("{0} blocks in volume ({1} bytes)", besb.num_blocks, besb.num_blocks * besb.block_size).AppendLine(); sb.AppendFormat("{0} used blocks ({1} bytes)", besb.used_blocks, besb.used_blocks * besb.block_size).AppendLine(); sb.AppendFormat("{0} bytes per i-node", besb.inode_size).AppendLine(); sb.AppendFormat("{0} blocks per allocation group ({1} bytes)", besb.blocks_per_ag, besb.blocks_per_ag * besb.block_size).AppendLine(); sb.AppendFormat("{0} allocation groups in volume", besb.num_ags).AppendLine(); sb.AppendFormat("Journal resides in block {0} of allocation group {1} and runs for {2} blocks ({3} bytes)", besb.log_blocks_start, besb.log_blocks_ag, besb.log_blocks_len, besb.log_blocks_len * besb.block_size).AppendLine(); sb.AppendFormat("Journal starts in byte {0} and ends in byte {1}", besb.log_start, besb.log_end).AppendLine(); 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, besb.root_dir_ag, besb.root_dir_len, besb.root_dir_len * besb.block_size).AppendLine(); sb.AppendFormat("Indices' i-node resides in block {0} of allocation group {1} and runs for {2} blocks ({3} bytes)", besb.indices_start, besb.indices_ag, besb.indices_len, besb.indices_len * besb.block_size).AppendLine(); information = sb.ToString(); xmlFSType = new Schemas.FileSystemType(); xmlFSType.Clusters = besb.num_blocks; xmlFSType.ClusterSize = (int)besb.block_size; xmlFSType.Dirty = besb.flags == BEFS_DIRTY; xmlFSType.FreeClusters = besb.num_blocks - besb.used_blocks; xmlFSType.FreeClustersSpecified = true; xmlFSType.Type = "BeFS"; xmlFSType.VolumeName = besb.name; } /// /// Be superblock /// struct BeSuperBlock { /// 0x000, Volume name, 32 bytes public string name; /// 0x020, "BFS1", 0x42465331 public UInt32 magic1; /// 0x024, "BIGE", 0x42494745 public UInt32 fs_byte_order; /// 0x028, Bytes per block public UInt32 block_size; /// 0x02C, 1 << block_shift == block_size public UInt32 block_shift; /// 0x030, Blocks in volume public Int64 num_blocks; /// 0x038, Used blocks in volume public Int64 used_blocks; /// 0x040, Bytes per inode public Int32 inode_size; /// 0x044, 0xDD121031 public UInt32 magic2; /// 0x048, Blocks per allocation group public Int32 blocks_per_ag; /// 0x04C, 1 << ag_shift == blocks_per_ag public Int32 ag_shift; /// 0x050, Allocation groups in volume public Int32 num_ags; /// 0x054, 0x434c454e if clean, 0x44495254 if dirty public UInt32 flags; /// 0x058, Allocation group of journal public Int32 log_blocks_ag; /// 0x05C, Start block of journal, inside ag public UInt16 log_blocks_start; /// 0x05E, Length in blocks of journal, inside ag public UInt16 log_blocks_len; /// 0x060, Start of journal public Int64 log_start; /// 0x068, End of journal public Int64 log_end; /// 0x070, 0x15B6830E public UInt32 magic3; /// 0x074, Allocation group where root folder's i-node resides public Int32 root_dir_ag; /// 0x078, Start in ag of root folder's i-node public UInt16 root_dir_start; /// 0x07A, As this is part of inode_addr, this is 1 public UInt16 root_dir_len; /// 0x07C, Allocation group where indices' i-node resides public Int32 indices_ag; /// 0x080, Start in ag of indices' i-node public UInt16 indices_start; /// 0x082, As this is part of inode_addr, this is 1 public UInt16 indices_len; } } }