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299 lines
12 KiB
C#
299 lines
12 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : HAMMER.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : HAMMER filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the HAMMER 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 © 2011-2018 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Collections.Generic;
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using System.Diagnostics.CodeAnalysis;
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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.DiscImages;
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using Schemas;
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using hammer_crc_t = System.UInt32;
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using hammer_off_t = System.UInt64;
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using hammer_tid_t = System.UInt64;
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#pragma warning disable 169
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namespace DiscImageChef.Filesystems
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{
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public class HAMMER : IFilesystem
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{
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const ulong HAMMER_FSBUF_VOLUME = 0xC8414D4DC5523031;
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const ulong HAMMER_FSBUF_VOLUME_REV = 0x313052C54D4D41C8;
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const uint HAMMER_VOLHDR_SIZE = 1928;
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const int HAMMER_BIGBLOCK_SIZE = 8192 * 1024;
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Encoding currentEncoding;
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FileSystemType xmlFsType;
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public virtual FileSystemType XmlFsType => xmlFsType;
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public virtual Encoding Encoding => currentEncoding;
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public virtual string Name => "HAMMER Filesystem";
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public virtual Guid Id => new Guid("91A188BF-5FD7-4677-BBD3-F59EBA9C864D");
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public virtual bool Identify(IMediaImage imagePlugin, Partition partition)
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{
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uint run = HAMMER_VOLHDR_SIZE / imagePlugin.Info.SectorSize;
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if(HAMMER_VOLHDR_SIZE % imagePlugin.Info.SectorSize > 0) run++;
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if(run + partition.Start >= partition.End) return false;
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ulong magic;
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byte[] sbSector = imagePlugin.ReadSectors(partition.Start, run);
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magic = BitConverter.ToUInt64(sbSector, 0);
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return magic == HAMMER_FSBUF_VOLUME || magic == HAMMER_FSBUF_VOLUME_REV;
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}
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public virtual void GetInformation(IMediaImage imagePlugin, Partition partition, out string information, Encoding encoding)
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{
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currentEncoding = encoding ?? Encoding.GetEncoding("iso-8859-15");
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information = "";
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StringBuilder sb = new StringBuilder();
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HammerSuperBlock hammerSb;
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uint run = HAMMER_VOLHDR_SIZE / imagePlugin.Info.SectorSize;
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if(HAMMER_VOLHDR_SIZE % imagePlugin.Info.SectorSize > 0) run++;
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ulong magic;
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byte[] sbSector = imagePlugin.ReadSectors(partition.Start, run);
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magic = BitConverter.ToUInt64(sbSector, 0);
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if(magic == HAMMER_FSBUF_VOLUME)
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{
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GCHandle handle = GCHandle.Alloc(sbSector, GCHandleType.Pinned);
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hammerSb = (HammerSuperBlock)Marshal.PtrToStructure(handle.AddrOfPinnedObject(),
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typeof(HammerSuperBlock));
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handle.Free();
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}
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else hammerSb = BigEndianMarshal.ByteArrayToStructureBigEndian<HammerSuperBlock>(sbSector);
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sb.AppendLine("HAMMER filesystem");
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sb.AppendFormat("Volume version: {0}", hammerSb.vol_version).AppendLine();
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sb.AppendFormat("Volume {0} of {1} on this filesystem", hammerSb.vol_no + 1, hammerSb.vol_count)
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.AppendLine();
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sb.AppendFormat("Volume name: {0}", StringHandlers.CToString(hammerSb.vol_label, currentEncoding))
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.AppendLine();
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sb.AppendFormat("Volume serial: {0}", hammerSb.vol_fsid).AppendLine();
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sb.AppendFormat("Filesystem type: {0}", hammerSb.vol_fstype).AppendLine();
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sb.AppendFormat("Boot area starts at {0}", hammerSb.vol_bot_beg).AppendLine();
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sb.AppendFormat("Memory log starts at {0}", hammerSb.vol_mem_beg).AppendLine();
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sb.AppendFormat("First volume buffer starts at {0}", hammerSb.vol_buf_beg).AppendLine();
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sb.AppendFormat("Volume ends at {0}", hammerSb.vol_buf_end).AppendLine();
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xmlFsType = new FileSystemType
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{
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Clusters = (long)(partition.Size / HAMMER_BIGBLOCK_SIZE),
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ClusterSize = HAMMER_BIGBLOCK_SIZE,
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Dirty = false,
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Type = "HAMMER",
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VolumeName = StringHandlers.CToString(hammerSb.vol_label, currentEncoding),
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VolumeSerial = hammerSb.vol_fsid.ToString()
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};
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if(hammerSb.vol_no == hammerSb.vol_rootvol)
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{
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sb.AppendFormat("Filesystem contains {0} \"big-blocks\" ({1} bytes)", hammerSb.vol0_stat_bigblocks,
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hammerSb.vol0_stat_bigblocks * HAMMER_BIGBLOCK_SIZE).AppendLine();
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sb.AppendFormat("Filesystem has {0} \"big-blocks\" free ({1} bytes)", hammerSb.vol0_stat_freebigblocks,
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hammerSb.vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE).AppendLine();
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sb.AppendFormat("Filesystem has {0} inode used", hammerSb.vol0_stat_inodes).AppendLine();
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xmlFsType.Clusters = hammerSb.vol0_stat_bigblocks;
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xmlFsType.FreeClusters = hammerSb.vol0_stat_freebigblocks;
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xmlFsType.FreeClustersSpecified = true;
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xmlFsType.Files = hammerSb.vol0_stat_inodes;
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xmlFsType.FilesSpecified = true;
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}
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// 0 ?
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//sb.AppendFormat("Volume header CRC: 0x{0:X8}", afs_sb.vol_crc).AppendLine();
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information = sb.ToString();
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}
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public virtual Errno Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding, bool debug)
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{
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return Errno.NotImplemented;
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}
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public virtual Errno Unmount()
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{
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return Errno.NotImplemented;
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}
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public virtual Errno MapBlock(string path, long fileBlock, ref long deviceBlock)
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{
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return Errno.NotImplemented;
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}
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public virtual Errno GetAttributes(string path, ref FileAttributes attributes)
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{
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return Errno.NotImplemented;
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}
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public virtual Errno ListXAttr(string path, ref List<string> xattrs)
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{
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return Errno.NotImplemented;
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}
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public virtual Errno GetXattr(string path, string xattr, ref byte[] buf)
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{
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return Errno.NotImplemented;
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}
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public virtual Errno Read(string path, long offset, long size, ref byte[] buf)
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{
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return Errno.NotImplemented;
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}
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public virtual Errno ReadDir(string path, ref List<string> contents)
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{
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return Errno.NotImplemented;
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}
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public virtual Errno StatFs(ref FileSystemInfo stat)
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{
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return Errno.NotImplemented;
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}
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public virtual Errno Stat(string path, ref FileEntryInfo stat)
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{
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return Errno.NotImplemented;
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}
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public virtual Errno ReadLink(string path, ref string dest)
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{
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return Errno.NotImplemented;
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}
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/// <summary>
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/// Hammer superblock
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/// </summary>
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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[SuppressMessage("ReSharper", "BuiltInTypeReferenceStyle")]
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struct HammerSuperBlock
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{
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/// <summary><see cref="HAMMER_FSBUF_VOLUME" /> for a valid header</summary>
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public ulong vol_signature;
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/* These are relative to block device offset, not zone offsets. */
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/// <summary>offset of boot area</summary>
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public long vol_bot_beg;
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/// <summary>offset of memory log</summary>
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public long vol_mem_beg;
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/// <summary>offset of the first buffer in volume</summary>
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public long vol_buf_beg;
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/// <summary>offset of volume EOF (on buffer boundary)</summary>
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public long vol_buf_end;
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public long vol_reserved01;
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/// <summary>identify filesystem</summary>
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public Guid vol_fsid;
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/// <summary>identify filesystem type</summary>
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public Guid vol_fstype;
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/// <summary>filesystem label</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public byte[] vol_label;
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/// <summary>volume number within filesystem</summary>
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public int vol_no;
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/// <summary>number of volumes making up filesystem</summary>
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public int vol_count;
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/// <summary>version control information</summary>
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public uint vol_version;
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/// <summary>header crc</summary>
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public hammer_crc_t vol_crc;
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/// <summary>volume flags</summary>
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public uint vol_flags;
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/// <summary>the root volume number (must be 0)</summary>
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public uint vol_rootvol;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)] public uint[] vol_reserved;
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/*
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* These fields are initialized and space is reserved in every
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* volume making up a HAMMER filesytem, but only the root volume
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* contains valid data. Note that vol0_stat_bigblocks does not
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* include big-blocks for freemap and undomap initially allocated
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* by newfs_hammer(8).
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*/
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/// <summary>total big-blocks when fs is empty</summary>
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public long vol0_stat_bigblocks;
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/// <summary>number of free big-blocks</summary>
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public long vol0_stat_freebigblocks;
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public long vol0_reserved01;
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/// <summary>for statfs only</summary>
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public long vol0_stat_inodes;
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public long vol0_reserved02;
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/// <summary>B-Tree root offset in zone-8</summary>
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public hammer_off_t vol0_btree_root;
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/// <summary>highest partially synchronized TID</summary>
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public hammer_tid_t vol0_next_tid;
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public hammer_off_t vol0_reserved03;
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/// <summary>
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/// Blockmaps for zones. Not all zones use a blockmap. Note that the entire root blockmap is cached in the
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/// hammer_mount structure.
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/// </summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)] public HammerBlockMap[] vol0_blockmap;
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/// <summary>Array of zone-2 addresses for undo FIFO.</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)] public hammer_off_t[] vol0_undo_array;
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}
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[SuppressMessage("ReSharper", "InconsistentNaming")]
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[SuppressMessage("ReSharper", "BuiltInTypeReferenceStyle")]
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struct HammerBlockMap
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{
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/// <summary>zone-2 offset only used by zone-4</summary>
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public hammer_off_t phys_offset;
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/// <summary>zone-X offset only used by zone-3</summary>
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public hammer_off_t first_offset;
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/// <summary>zone-X offset for allocation</summary>
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public hammer_off_t next_offset;
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/// <summary>zone-X offset only used by zone-3</summary>
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public hammer_off_t alloc_offset;
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public uint reserved01;
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public hammer_crc_t entry_crc;
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}
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}
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} |