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https://github.com/aaru-dps/Aaru.git
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276 lines
14 KiB
C#
276 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 : Extent.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 extents.
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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 DiscImageChef.Console;
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using DiscImageChef.Decoders;
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using DiscImageChef.DiscImages;
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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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public Errno MapBlock(string path, long fileBlock, out long deviceBlock)
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{
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deviceBlock = 0;
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// TODO: Not really important.
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return Errno.NotImplemented;
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}
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/// <summary>
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/// Searches the disk for an extents file (or gets it from cache)
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/// </summary>
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/// <returns>Error.</returns>
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/// <param name="fileId">File identifier.</param>
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/// <param name="file">Extents file.</param>
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Errno ReadExtentsFile(short fileId, out ExtentFile file)
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{
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file = new ExtentFile();
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if(!mounted) return Errno.AccessDenied;
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if(fileId < 4 || fileId == 4 && mddf.fsversion != LISA_V2 && mddf.fsversion != LISA_V1)
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return Errno.InvalidArgument;
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if(extentCache.TryGetValue(fileId, out file)) return Errno.NoError;
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// A file ID that cannot be stored in the S-Records File
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if(fileId >= srecords.Length) return Errno.InvalidArgument;
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ulong ptr = srecords[fileId].extent_ptr;
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// An invalid pointer denotes file does not exist
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if(ptr == 0xFFFFFFFF || ptr == 0x00000000) return Errno.NoSuchFile;
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// Pointers are relative to MDDF
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ptr += mddf.mddf_block + volumePrefix;
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LisaTag.PriamTag extTag;
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// This happens on some disks.
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// This is a filesystem corruption that makes LisaOS crash on scavenge.
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// This code just allow to ignore that corruption by searching the Extents File using sector tags
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if(ptr >= device.Info.Sectors)
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{
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bool found = false;
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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 extTag);
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if(extTag.FileId != fileId * -1) continue;
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ptr = i;
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found = true;
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break;
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}
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if(!found) return Errno.InvalidArgument;
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}
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// Checks that the sector tag indicates its the Extents File we are searching for
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DecodeTag(device.ReadSectorTag(ptr, SectorTagType.AppleSectorTag), out extTag);
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if(extTag.FileId != (short)(-1 * fileId)) return Errno.NoSuchFile;
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byte[] sector = mddf.fsversion == LISA_V1 ? device.ReadSectors(ptr, 2) : device.ReadSector(ptr);
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if(sector[0] >= 32 || sector[0] == 0) return Errno.InvalidArgument;
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file.filenameLen = sector[0];
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file.filename = new byte[file.filenameLen];
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Array.Copy(sector, 0x01, file.filename, 0, file.filenameLen);
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file.unknown1 = BigEndianBitConverter.ToUInt16(sector, 0x20);
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file.file_uid = BigEndianBitConverter.ToUInt64(sector, 0x22);
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file.unknown2 = sector[0x2A];
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file.etype = sector[0x2B];
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file.ftype = (FileType)sector[0x2C];
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file.unknown3 = sector[0x2D];
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file.dtc = BigEndianBitConverter.ToUInt32(sector, 0x2E);
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file.dta = BigEndianBitConverter.ToUInt32(sector, 0x32);
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file.dtm = BigEndianBitConverter.ToUInt32(sector, 0x36);
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file.dtb = BigEndianBitConverter.ToUInt32(sector, 0x3A);
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file.dts = BigEndianBitConverter.ToUInt32(sector, 0x3E);
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file.serial = BigEndianBitConverter.ToUInt32(sector, 0x42);
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file.unknown4 = sector[0x46];
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file.locked = sector[0x47];
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file.protect = sector[0x48];
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file.master = sector[0x49];
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file.scavenged = sector[0x4A];
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file.closed = sector[0x4B];
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file.open = sector[0x4C];
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file.unknown5 = new byte[11];
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Array.Copy(sector, 0x4D, file.unknown5, 0, 11);
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file.release = BigEndianBitConverter.ToUInt16(sector, 0x58);
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file.build = BigEndianBitConverter.ToUInt16(sector, 0x5A);
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file.compatibility = BigEndianBitConverter.ToUInt16(sector, 0x5C);
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file.revision = BigEndianBitConverter.ToUInt16(sector, 0x5E);
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file.unknown6 = BigEndianBitConverter.ToUInt16(sector, 0x60);
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file.password_valid = sector[0x62];
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file.password = new byte[8];
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Array.Copy(sector, 0x63, file.password, 0, 8);
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file.unknown7 = new byte[3];
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Array.Copy(sector, 0x6B, file.unknown7, 0, 3);
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file.overhead = BigEndianBitConverter.ToUInt16(sector, 0x6E);
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file.unknown8 = new byte[16];
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Array.Copy(sector, 0x70, file.unknown8, 0, 16);
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file.unknown10 = BigEndianBitConverter.ToInt16(sector, 0x17E);
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file.LisaInfo = new byte[128];
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Array.Copy(sector, 0x180, file.LisaInfo, 0, 128);
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int extentsCount = 0;
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int extentsOffset;
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if(mddf.fsversion == LISA_V1)
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{
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file.length = BigEndianBitConverter.ToInt32(sector, 0x200);
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file.unknown9 = BigEndianBitConverter.ToInt32(sector, 0x204);
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extentsOffset = 0x208;
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}
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else
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{
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file.length = BigEndianBitConverter.ToInt32(sector, 0x80);
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file.unknown9 = BigEndianBitConverter.ToInt32(sector, 0x84);
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extentsOffset = 0x88;
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}
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for(int j = 0; j < 41; j++)
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{
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if(BigEndianBitConverter.ToInt16(sector, extentsOffset + j * 6 + 4) == 0) break;
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extentsCount++;
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}
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file.extents = new Extent[extentsCount];
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for(int j = 0; j < extentsCount; j++)
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file.extents[j] = new Extent
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{
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start = BigEndianBitConverter.ToInt32(sector, extentsOffset + j * 6),
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length = BigEndianBitConverter.ToInt16(sector, extentsOffset + j * 6 + 4)
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};
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extentCache.Add(fileId, file);
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if(!debug) return Errno.NoError;
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if(printedExtents.Contains(fileId)) return Errno.NoError;
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].filenameLen = {1}", fileId, file.filenameLen);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].filename = {1}", fileId,
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StringHandlers.CToString(file.filename, Encoding));
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].unknown1 = 0x{1:X4}", fileId, file.unknown1);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].file_uid = 0x{1:X16}", fileId, file.file_uid);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].unknown2 = 0x{1:X2}", fileId, file.unknown2);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].etype = 0x{1:X2}", fileId, file.etype);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].ftype = {1}", fileId, file.ftype);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].unknown3 = 0x{1:X2}", fileId, file.unknown3);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].dtc = {1}", fileId, file.dtc);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].dta = {1}", fileId, file.dta);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].dtm = {1}", fileId, file.dtm);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].dtb = {1}", fileId, file.dtb);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].dts = {1}", fileId, file.dts);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].serial = {1}", fileId, file.serial);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].unknown4 = 0x{1:X2}", fileId, file.unknown4);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].locked = {1}", fileId, file.locked > 0);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].protect = {1}", fileId, file.protect > 0);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].master = {1}", fileId, file.master > 0);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].scavenged = {1}", fileId, file.scavenged > 0);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].closed = {1}", fileId, file.closed > 0);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].open = {1}", fileId, file.open > 0);
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DicConsole.DebugWriteLine("LisaFS plugin",
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"ExtentFile[{0}].unknown5 = 0x{1:X2}{2:X2}{3:X2}{4:X2}{5:X2}{6:X2}{7:X2}{8:X2}{9:X2}" +
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"{10:X2}{11:X2}", fileId, file.unknown5[0], file.unknown5[1], file.unknown5[2],
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file.unknown5[3], file.unknown5[4], file.unknown5[5], file.unknown5[6],
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file.unknown5[7], file.unknown5[8], file.unknown5[9], file.unknown5[10]);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].release = {1}", fileId, file.release);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].build = {1}", fileId, file.build);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].compatibility = {1}", fileId,
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file.compatibility);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].revision = {1}", fileId, file.revision);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].unknown6 = 0x{1:X4}", fileId, file.unknown6);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].password_valid = {1}", fileId,
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file.password_valid > 0);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].password = {1}", fileId,
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Encoding.GetString(file.password));
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].unknown7 = 0x{1:X2}{2:X2}{3:X2}", fileId,
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file.unknown7[0], file.unknown7[1], file.unknown7[2]);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].overhead = {1}", fileId, file.overhead);
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DicConsole.DebugWriteLine("LisaFS plugin",
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"ExtentFile[{0}].unknown8 = 0x{1:X2}{2:X2}{3:X2}{4:X2}{5:X2}{6:X2}{7:X2}{8:X2}{9:X2}" +
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"{10:X2}{11:X2}{12:X2}{13:X2}{14:X2}{15:X2}{16:X2}", fileId, file.unknown8[0],
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file.unknown8[1], file.unknown8[2], file.unknown8[3], file.unknown8[4],
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file.unknown8[5], file.unknown8[6], file.unknown8[7], file.unknown8[8],
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file.unknown8[9], file.unknown8[10], file.unknown8[11], file.unknown8[12],
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file.unknown8[13], file.unknown8[14], file.unknown8[15]);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].length = {1}", fileId, file.length);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].unknown9 = 0x{1:X8}", fileId, file.unknown9);
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for(int ext = 0; ext < file.extents.Length; ext++)
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{
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].extents[{1}].start = {2}", fileId, ext,
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file.extents[ext].start);
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].extents[{1}].length = {2}", fileId, ext,
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file.extents[ext].length);
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}
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DicConsole.DebugWriteLine("LisaFS plugin", "ExtentFile[{0}].unknown10 = 0x{1:X4}", fileId, file.unknown10);
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printedExtents.Add(fileId);
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return Errno.NoError;
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}
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/// <summary>
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/// Reads all the S-Records and caches it
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/// </summary>
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Errno ReadSRecords()
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{
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if(!mounted) return Errno.AccessDenied;
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// Searches the S-Records place using MDDF pointers
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byte[] sectors = device.ReadSectors(mddf.srec_ptr + mddf.mddf_block + volumePrefix, mddf.srec_len);
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// Each entry takes 14 bytes
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srecords = new SRecord[sectors.Length / 14];
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for(int s = 0; s < srecords.Length; s++)
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srecords[s] = new SRecord
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{
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extent_ptr = BigEndianBitConverter.ToUInt32(sectors, 0x00 + 14 * s),
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unknown = BigEndianBitConverter.ToUInt32(sectors, 0x04 + 14 * s),
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filesize = BigEndianBitConverter.ToUInt32(sectors, 0x08 + 14 * s),
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flags = BigEndianBitConverter.ToUInt16(sectors, 0x0C + 14 * s)
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};
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return Errno.NoError;
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}
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}
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} |