mirror of
https://github.com/aaru-dps/Aaru.git
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219 lines
8.6 KiB
C#
219 lines
8.6 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Super.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Apple Macintosh 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.Collections.Generic;
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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 FileSystemInfo = Aaru.CommonTypes.Structs.FileSystemInfo;
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using Partition = Aaru.CommonTypes.Partition;
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namespace Aaru.Filesystems;
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// Information from Inside Macintosh Volume II
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public sealed partial class AppleMFS
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{
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const int BYTES_BEFORE_BLOCK_MAP = 64;
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#region IReadOnlyFilesystem Members
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/// <inheritdoc />
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public ErrorNumber Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding,
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Dictionary<string, string> options, string @namespace)
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{
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_device = imagePlugin;
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_partitionStart = partition.Start;
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_encoding = encoding ?? Encoding.GetEncoding("macintosh");
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options ??= GetDefaultOptions();
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if(options.TryGetValue("debug", out string debugString)) bool.TryParse(debugString, out _debug);
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_volMdb = new MasterDirectoryBlock();
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ErrorNumber errno = _device.ReadSector(2 + _partitionStart, out _mdbBlocks);
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if(errno != ErrorNumber.NoError) return errno;
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errno = _device.ReadSector(0 + _partitionStart, out _bootBlocks);
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if(errno != ErrorNumber.NoError) return errno;
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_volMdb.drSigWord = BigEndianBitConverter.ToUInt16(_mdbBlocks, 0x000);
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if(_volMdb.drSigWord != MFS_MAGIC) return ErrorNumber.InvalidArgument;
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_volMdb.drCrDate = BigEndianBitConverter.ToUInt32(_mdbBlocks, 0x002);
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_volMdb.drLsBkUp = BigEndianBitConverter.ToUInt32(_mdbBlocks, 0x006);
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_volMdb.drAtrb = (AppleCommon.VolumeAttributes)BigEndianBitConverter.ToUInt16(_mdbBlocks, 0x00A);
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_volMdb.drNmFls = BigEndianBitConverter.ToUInt16(_mdbBlocks, 0x00C);
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_volMdb.drDirSt = BigEndianBitConverter.ToUInt16(_mdbBlocks, 0x00E);
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_volMdb.drBlLen = BigEndianBitConverter.ToUInt16(_mdbBlocks, 0x010);
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_volMdb.drNmAlBlks = BigEndianBitConverter.ToUInt16(_mdbBlocks, 0x012);
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_volMdb.drAlBlkSiz = BigEndianBitConverter.ToUInt32(_mdbBlocks, 0x014);
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_volMdb.drClpSiz = BigEndianBitConverter.ToUInt32(_mdbBlocks, 0x018);
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_volMdb.drAlBlSt = BigEndianBitConverter.ToUInt16(_mdbBlocks, 0x01C);
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_volMdb.drNxtFNum = BigEndianBitConverter.ToUInt32(_mdbBlocks, 0x01E);
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_volMdb.drFreeBks = BigEndianBitConverter.ToUInt16(_mdbBlocks, 0x022);
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_volMdb.drVNSiz = _mdbBlocks[0x024];
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byte[] variableSize = new byte[_volMdb.drVNSiz + 1];
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Array.Copy(_mdbBlocks, 0x024, variableSize, 0, _volMdb.drVNSiz + 1);
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_volMdb.drVN = StringHandlers.PascalToString(variableSize, _encoding);
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errno = _device.ReadSectors(_volMdb.drDirSt + _partitionStart, _volMdb.drBlLen, out _directoryBlocks);
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if(errno != ErrorNumber.NoError) return errno;
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int bytesInBlockMap = _volMdb.drNmAlBlks * 12 / 8 + _volMdb.drNmAlBlks * 12 % 8;
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int bytesInWholeMdb = bytesInBlockMap + BYTES_BEFORE_BLOCK_MAP;
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int sectorsInWholeMdb = bytesInWholeMdb / (int)_device.Info.SectorSize +
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bytesInWholeMdb % (int)_device.Info.SectorSize;
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errno = _device.ReadSectors(_partitionStart + 2, (uint)sectorsInWholeMdb, out byte[] wholeMdb);
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if(errno != ErrorNumber.NoError) return errno;
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_blockMapBytes = new byte[bytesInBlockMap];
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Array.Copy(wholeMdb, BYTES_BEFORE_BLOCK_MAP, _blockMapBytes, 0, _blockMapBytes.Length);
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int offset = 0;
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_blockMap = new uint[_volMdb.drNmAlBlks + 2 + 1];
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for(int i = 2; i < _volMdb.drNmAlBlks + 2; i += 8)
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{
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uint tmp1 = 0;
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uint tmp2 = 0;
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uint tmp3 = 0;
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if(offset + 4 <= _blockMapBytes.Length) tmp1 = BigEndianBitConverter.ToUInt32(_blockMapBytes, offset);
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if(offset + 4 + 4 <= _blockMapBytes.Length)
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tmp2 = BigEndianBitConverter.ToUInt32(_blockMapBytes, offset + 4);
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if(offset + 8 + 4 <= _blockMapBytes.Length)
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tmp3 = BigEndianBitConverter.ToUInt32(_blockMapBytes, offset + 8);
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if(i < _blockMap.Length) _blockMap[i] = (tmp1 & 0xFFF00000) >> 20;
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if(i + 2 < _blockMap.Length) _blockMap[i + 1] = (tmp1 & 0xFFF00) >> 8;
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if(i + 3 < _blockMap.Length) _blockMap[i + 2] = ((tmp1 & 0xFF) << 4) + ((tmp2 & 0xF0000000) >> 28);
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if(i + 4 < _blockMap.Length) _blockMap[i + 3] = (tmp2 & 0xFFF0000) >> 16;
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if(i + 5 < _blockMap.Length) _blockMap[i + 4] = (tmp2 & 0xFFF0) >> 4;
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if(i + 6 < _blockMap.Length) _blockMap[i + 5] = ((tmp2 & 0xF) << 8) + ((tmp3 & 0xFF000000) >> 24);
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if(i + 7 < _blockMap.Length) _blockMap[i + 6] = (tmp3 & 0xFFF000) >> 12;
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if(i + 8 < _blockMap.Length) _blockMap[i + 7] = tmp3 & 0xFFF;
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offset += 12;
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}
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if(_device.Info.ReadableSectorTags.Contains(SectorTagType.AppleSectorTag))
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{
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_device.ReadSectorTag(2 + _partitionStart, SectorTagType.AppleSectorTag, out _mdbTags);
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_device.ReadSectorTag(0 + _partitionStart, SectorTagType.AppleSectorTag, out _bootTags);
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_device.ReadSectorsTag(_volMdb.drDirSt + _partitionStart,
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_volMdb.drBlLen,
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SectorTagType.AppleSectorTag,
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out _directoryTags);
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_device.ReadSectorsTag(_partitionStart + 2,
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(uint)sectorsInWholeMdb,
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SectorTagType.AppleSectorTag,
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out _bitmapTags);
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}
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_sectorsPerBlock = (int)(_volMdb.drAlBlkSiz / _device.Info.SectorSize);
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if(!FillDirectory()) return ErrorNumber.InvalidArgument;
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_mounted = true;
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ushort bbSig = BigEndianBitConverter.ToUInt16(_bootBlocks, 0x000);
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if(bbSig != AppleCommon.BB_MAGIC) _bootBlocks = null;
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Metadata = new FileSystem();
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if(_volMdb.drLsBkUp > 0) Metadata.BackupDate = DateHandlers.MacToDateTime(_volMdb.drLsBkUp);
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Metadata.Bootable = bbSig == AppleCommon.BB_MAGIC;
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Metadata.Clusters = _volMdb.drNmAlBlks;
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Metadata.ClusterSize = _volMdb.drAlBlkSiz;
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if(_volMdb.drCrDate > 0) Metadata.CreationDate = DateHandlers.MacToDateTime(_volMdb.drCrDate);
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Metadata.Files = _volMdb.drNmFls;
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Metadata.FreeClusters = _volMdb.drFreeBks;
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Metadata.Type = FS_TYPE;
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Metadata.VolumeName = _volMdb.drVN;
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber Unmount()
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{
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_mounted = false;
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_idToFilename = null;
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_idToEntry = null;
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_filenameToId = null;
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_bootBlocks = null;
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber StatFs(out FileSystemInfo stat)
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{
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stat = new FileSystemInfo
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{
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Blocks = _volMdb.drNmAlBlks,
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FilenameLength = 255,
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Files = _volMdb.drNmFls,
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FreeBlocks = _volMdb.drFreeBks,
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PluginId = Id,
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Type = FS_TYPE
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};
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stat.FreeFiles = uint.MaxValue - stat.Files;
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return ErrorNumber.NoError;
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}
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#endregion
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} |