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321 lines
14 KiB
C#
321 lines
14 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : Dir.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Apple Lisa filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Methods to handle Apple Lisa filesystem catalogs (aka directories).
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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.Collections.Generic;
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using System.Linq;
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using DiscImageChef.CommonTypes.Enums;
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using DiscImageChef.CommonTypes.Structs;
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using DiscImageChef.Decoders;
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namespace DiscImageChef.Filesystems.LisaFS
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{
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public partial class LisaFS
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{
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/// <summary>
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/// Solves a symbolic link.
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/// </summary>
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/// <param name="path">Link path.</param>
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/// <param name="dest">Link destination.</param>
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public Errno ReadLink(string path, out string dest)
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{
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dest = null;
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// LisaFS does not support symbolic links (afaik)
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return Errno.NotSupported;
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}
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/// <summary>
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/// Lists contents from a directory.
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/// </summary>
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/// <param name="path">Directory path.</param>
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/// <param name="contents">Directory contents.</param>
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public Errno ReadDir(string path, out List<string> contents)
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{
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contents = null;
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Errno error = LookupFileId(path, out short fileId, out bool isDir);
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if(error != Errno.NoError) return error;
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if(!isDir) return Errno.NotDirectory;
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/*List<CatalogEntry> catalog;
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error = ReadCatalog(fileId, out catalog);
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if(error != Errno.NoError)
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return error;*/
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ReadDir(fileId, out contents);
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// On debug add system files as readable files
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// Syntax similar to NTFS
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if(debug && fileId == DIRID_ROOT)
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{
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contents.Add("$MDDF");
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contents.Add("$Boot");
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contents.Add("$Loader");
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contents.Add("$Bitmap");
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contents.Add("$S-Record");
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contents.Add("$");
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}
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contents.Sort();
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return Errno.NoError;
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}
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Errno ReadDir(short dirId, out List<string> contents)
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{
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// Do same trick as Mac OS X, replace filesystem '/' with '-',
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// as '-' is the path separator in Lisa OS
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contents = (from entry in catalogCache
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where entry.parentID == dirId
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select StringHandlers.CToString(entry.filename, Encoding).Replace('/', '-')).ToList();
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return Errno.NoError;
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}
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/// <summary>
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/// Reads, interprets and caches the Catalog File
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/// </summary>
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Errno ReadCatalog()
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{
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if(!mounted) return Errno.AccessDenied;
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catalogCache = new List<CatalogEntry>();
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// Do differently for V1 and V2
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if(mddf.fsversion == LISA_V2 || mddf.fsversion == LISA_V1)
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{
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Errno error = ReadFile((short)FILEID_CATALOG, out byte[] buf);
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if(error != Errno.NoError) return error;
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int offset = 0;
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List<CatalogEntryV2> catalogV2 = new List<CatalogEntryV2>();
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// For each entry on the catalog
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while(offset + 54 < buf.Length)
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{
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CatalogEntryV2 entV2 = new CatalogEntryV2
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{
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filenameLen = buf[offset],
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filename = new byte[E_NAME],
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unknown1 = buf[offset + 0x21],
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fileType = buf[offset + 0x22],
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unknown2 = buf[offset + 0x23],
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fileID = BigEndianBitConverter.ToInt16(buf, offset + 0x24),
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unknown3 = new byte[16]
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};
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Array.Copy(buf, offset + 0x01, entV2.filename, 0, E_NAME);
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Array.Copy(buf, offset + 0x26, entV2.unknown3, 0, 16);
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offset += 54;
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// Check that the entry is correct, not empty or garbage
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if(entV2.filenameLen != 0 && entV2.filenameLen <= E_NAME && entV2.fileType != 0 && entV2.fileID > 0)
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catalogV2.Add(entV2);
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}
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// Convert entries to V3 format
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foreach(CatalogEntryV2 entV2 in catalogV2)
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{
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error = ReadExtentsFile(entV2.fileID, out ExtentFile ext);
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if(error != Errno.NoError) continue;
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CatalogEntry entV3 = new CatalogEntry
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{
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fileID = entV2.fileID,
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filename = new byte[32],
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fileType = entV2.fileType,
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length = (int)srecords[entV2.fileID].filesize,
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dtc = ext.dtc,
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dtm = ext.dtm
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};
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Array.Copy(entV2.filename, 0, entV3.filename, 0, entV2.filenameLen);
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catalogCache.Add(entV3);
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}
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return Errno.NoError;
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}
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byte[] firstCatalogBlock = null;
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// Search for the first sector describing the catalog
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// While root catalog is not stored in S-Records, probably rest are? (unchecked)
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// If root catalog is not pointed in MDDF (unchecked) maybe it's always following S-Records File?
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for(ulong i = 0; i < device.Info.Sectors; i++)
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{
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DecodeTag(device.ReadSectorTag(i, SectorTagType.AppleSectorTag), out LisaTag.PriamTag catTag);
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if(catTag.FileId != FILEID_CATALOG || catTag.RelPage != 0) continue;
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firstCatalogBlock = device.ReadSectors(i, 4);
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break;
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}
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// Catalog not found
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if(firstCatalogBlock == null) return Errno.NoSuchFile;
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ulong prevCatalogPointer;
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prevCatalogPointer = BigEndianBitConverter.ToUInt32(firstCatalogBlock, 0x7F6);
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// Traverse double-linked list until first catalog block
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while(prevCatalogPointer != 0xFFFFFFFF)
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{
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DecodeTag(device.ReadSectorTag(prevCatalogPointer + mddf.mddf_block + volumePrefix, SectorTagType.AppleSectorTag),
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out LisaTag.PriamTag prevTag);
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if(prevTag.FileId != FILEID_CATALOG) return Errno.InvalidArgument;
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firstCatalogBlock = device.ReadSectors(prevCatalogPointer + mddf.mddf_block + volumePrefix, 4);
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prevCatalogPointer = BigEndianBitConverter.ToUInt32(firstCatalogBlock, 0x7F6);
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}
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ulong nextCatalogPointer;
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nextCatalogPointer = BigEndianBitConverter.ToUInt32(firstCatalogBlock, 0x7FA);
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List<byte[]> catalogBlocks = new List<byte[]> {firstCatalogBlock};
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// Traverse double-linked list to read full catalog
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while(nextCatalogPointer != 0xFFFFFFFF)
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{
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DecodeTag(device.ReadSectorTag(nextCatalogPointer + mddf.mddf_block + volumePrefix, SectorTagType.AppleSectorTag),
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out LisaTag.PriamTag nextTag);
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if(nextTag.FileId != FILEID_CATALOG) return Errno.InvalidArgument;
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byte[] nextCatalogBlock = device.ReadSectors(nextCatalogPointer + mddf.mddf_block + volumePrefix, 4);
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nextCatalogPointer = BigEndianBitConverter.ToUInt32(nextCatalogBlock, 0x7FA);
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catalogBlocks.Add(nextCatalogBlock);
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}
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// Foreach catalog block
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foreach(byte[] buf in catalogBlocks)
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{
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int offset = 0;
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// Traverse all entries
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while(offset + 64 <= buf.Length)
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// Catalog block header
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if(buf[offset + 0x24] == 0x08)
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offset += 78;
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// Maybe just garbage? Found in more than 1 disk
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else if(buf[offset + 0x24] == 0x7C) offset += 50;
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// Apparently reserved to indicate end of catalog?
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else if(buf[offset + 0x24] == 0xFF) break;
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// Normal entry
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else if(buf[offset + 0x24] == 0x03 && buf[offset] == 0x24)
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{
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CatalogEntry entry = new CatalogEntry
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{
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marker = buf[offset],
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parentID = BigEndianBitConverter.ToUInt16(buf, offset + 0x01),
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filename = new byte[E_NAME],
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terminator = buf[offset + 0x23],
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fileType = buf[offset + 0x24],
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unknown = buf[offset + 0x25],
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fileID = BigEndianBitConverter.ToInt16(buf, offset + 0x26),
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dtc = BigEndianBitConverter.ToUInt32(buf, offset + 0x28),
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dtm = BigEndianBitConverter.ToUInt32(buf, offset + 0x2C),
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length = BigEndianBitConverter.ToInt32(buf, offset + 0x30),
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wasted = BigEndianBitConverter.ToInt32(buf, offset + 0x34),
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tail = new byte[8]
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};
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Array.Copy(buf, offset + 0x03, entry.filename, 0, E_NAME);
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Array.Copy(buf, offset + 0x38, entry.tail, 0, 8);
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if(ReadExtentsFile(entry.fileID, out _) == Errno.NoError)
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if(!fileSizeCache.ContainsKey(entry.fileID))
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{
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catalogCache.Add(entry);
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fileSizeCache.Add(entry.fileID, entry.length);
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}
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offset += 64;
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}
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// Subdirectory entry
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else if(buf[offset + 0x24] == 0x01 && buf[offset] == 0x24)
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{
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CatalogEntry entry = new CatalogEntry
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{
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marker = buf[offset],
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parentID = BigEndianBitConverter.ToUInt16(buf, offset + 0x01),
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filename = new byte[E_NAME],
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terminator = buf[offset + 0x23],
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fileType = buf[offset + 0x24],
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unknown = buf[offset + 0x25],
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fileID = BigEndianBitConverter.ToInt16(buf, offset + 0x26),
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dtc = BigEndianBitConverter.ToUInt32(buf, offset + 0x28),
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dtm = BigEndianBitConverter.ToUInt32(buf, offset + 0x2C),
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length = 0,
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wasted = 0,
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tail = null
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};
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Array.Copy(buf, offset + 0x03, entry.filename, 0, E_NAME);
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if(!directoryDtcCache.ContainsKey(entry.fileID))
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directoryDtcCache.Add(entry.fileID, DateHandlers.LisaToDateTime(entry.dtc));
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catalogCache.Add(entry);
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offset += 48;
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}
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else break;
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}
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return Errno.NoError;
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}
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Errno StatDir(short dirId, out FileEntryInfo stat)
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{
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stat = null;
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if(!mounted) return Errno.AccessDenied;
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stat = new FileEntryInfo
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{
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Attributes = new FileAttributes(),
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Inode = FILEID_CATALOG,
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Mode = 0x16D,
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Links = 0,
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UID = 0,
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GID = 0,
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DeviceNo = 0,
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Length = 0,
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BlockSize = mddf.datasize,
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Blocks = 0
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};
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directoryDtcCache.TryGetValue(dirId, out DateTime tmp);
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stat.CreationTime = tmp;
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return Errno.NoError;
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}
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}
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} |