mirror of
https://github.com/aaru-dps/Aaru.git
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389 lines
14 KiB
C#
389 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 : File.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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// --[ Description ] ----------------------------------------------------------
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//
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// Methods to handle files.
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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 © 2011-2020 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.IO;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Structs;
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using Aaru.Console;
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using FileAttributes = Aaru.CommonTypes.Structs.FileAttributes;
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namespace Aaru.Filesystems.AppleMFS
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{
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// Information from Inside Macintosh Volume II
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public partial class AppleMFS
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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 = new long();
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if(!mounted)
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return Errno.AccessDenied;
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string[] pathElements = path.Split(new[]
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{
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'/'
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}, StringSplitOptions.RemoveEmptyEntries);
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if(pathElements.Length != 1)
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return Errno.NotSupported;
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path = pathElements[0];
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if(!filenameToId.TryGetValue(path.ToLowerInvariant(), out uint fileId))
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return Errno.NoSuchFile;
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if(!idToEntry.TryGetValue(fileId, out FileEntry entry))
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return Errno.NoSuchFile;
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if(fileBlock > entry.flPyLen / volMDB.drAlBlkSiz)
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return Errno.InvalidArgument;
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uint nextBlock = entry.flStBlk;
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long relBlock = 0;
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while(true)
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{
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if(relBlock == fileBlock)
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{
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deviceBlock = ((nextBlock - 2) * sectorsPerBlock) + volMDB.drAlBlSt + (long)partitionStart;
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return Errno.NoError;
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}
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if(blockMap[nextBlock] == BMAP_FREE ||
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blockMap[nextBlock] == BMAP_LAST)
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break;
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nextBlock = blockMap[nextBlock];
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relBlock++;
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}
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return Errno.InOutError;
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}
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public Errno GetAttributes(string path, out FileAttributes attributes)
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{
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attributes = new FileAttributes();
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if(!mounted)
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return Errno.AccessDenied;
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string[] pathElements = path.Split(new[]
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{
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'/'
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}, StringSplitOptions.RemoveEmptyEntries);
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if(pathElements.Length != 1)
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return Errno.NotSupported;
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path = pathElements[0];
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if(!filenameToId.TryGetValue(path.ToLowerInvariant(), out uint fileId))
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return Errno.NoSuchFile;
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if(!idToEntry.TryGetValue(fileId, out FileEntry entry))
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return Errno.NoSuchFile;
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if(entry.flUsrWds.fdFlags.HasFlag(AppleCommon.FinderFlags.kIsAlias))
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attributes |= FileAttributes.Alias;
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if(entry.flUsrWds.fdFlags.HasFlag(AppleCommon.FinderFlags.kHasBundle))
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attributes |= FileAttributes.Bundle;
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if(entry.flUsrWds.fdFlags.HasFlag(AppleCommon.FinderFlags.kHasBeenInited))
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attributes |= FileAttributes.HasBeenInited;
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if(entry.flUsrWds.fdFlags.HasFlag(AppleCommon.FinderFlags.kHasCustomIcon))
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attributes |= FileAttributes.HasCustomIcon;
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if(entry.flUsrWds.fdFlags.HasFlag(AppleCommon.FinderFlags.kHasNoINITs))
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attributes |= FileAttributes.HasNoINITs;
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if(entry.flUsrWds.fdFlags.HasFlag(AppleCommon.FinderFlags.kIsInvisible))
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attributes |= FileAttributes.Hidden;
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if(entry.flFlags.HasFlag(FileFlags.Locked))
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attributes |= FileAttributes.Immutable;
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if(entry.flUsrWds.fdFlags.HasFlag(AppleCommon.FinderFlags.kIsOnDesk))
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attributes |= FileAttributes.IsOnDesk;
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if(entry.flUsrWds.fdFlags.HasFlag(AppleCommon.FinderFlags.kIsShared))
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attributes |= FileAttributes.Shared;
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if(entry.flUsrWds.fdFlags.HasFlag(AppleCommon.FinderFlags.kIsStationery))
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attributes |= FileAttributes.Stationery;
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if(!attributes.HasFlag(FileAttributes.Alias) &&
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!attributes.HasFlag(FileAttributes.Bundle) &&
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!attributes.HasFlag(FileAttributes.Stationery))
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attributes |= FileAttributes.File;
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attributes |= FileAttributes.BlockUnits;
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return Errno.NoError;
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}
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public Errno Read(string path, long offset, long size, ref byte[] buf)
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{
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if(!mounted)
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return Errno.AccessDenied;
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byte[] file;
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Errno error = Errno.NoError;
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if(debug && string.Compare(path, "$", StringComparison.InvariantCulture) == 0)
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file = directoryBlocks;
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else if(debug &&
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string.Compare(path, "$Boot", StringComparison.InvariantCulture) == 0 &&
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bootBlocks != null)
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file = bootBlocks;
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else if(debug && string.Compare(path, "$Bitmap", StringComparison.InvariantCulture) == 0)
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file = blockMapBytes;
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else if(debug && string.Compare(path, "$MDB", StringComparison.InvariantCulture) == 0)
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file = mdbBlocks;
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else
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error = ReadFile(path, out file, false, false);
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if(error != Errno.NoError)
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return error;
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if(size == 0)
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{
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buf = new byte[0];
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return Errno.NoError;
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}
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if(offset >= file.Length)
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return Errno.InvalidArgument;
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if(size + offset >= file.Length)
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size = file.Length - offset;
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buf = new byte[size];
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Array.Copy(file, offset, buf, 0, size);
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return Errno.NoError;
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}
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public Errno Stat(string path, out FileEntryInfo stat)
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{
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stat = null;
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if(!mounted)
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return Errno.AccessDenied;
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string[] pathElements = path.Split(new[]
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{
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'/'
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}, StringSplitOptions.RemoveEmptyEntries);
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if(pathElements.Length != 1)
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return Errno.NotSupported;
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path = pathElements[0];
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if(debug)
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if(string.Compare(path, "$", StringComparison.InvariantCulture) == 0 ||
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string.Compare(path, "$Boot", StringComparison.InvariantCulture) == 0 ||
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string.Compare(path, "$Bitmap", StringComparison.InvariantCulture) == 0 ||
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string.Compare(path, "$MDB", StringComparison.InvariantCulture) == 0)
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{
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stat = new FileEntryInfo
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{
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BlockSize = device.Info.SectorSize, Inode = 0, Links = 1, Attributes = FileAttributes.System
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};
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if(string.Compare(path, "$", StringComparison.InvariantCulture) == 0)
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{
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stat.Blocks = (directoryBlocks.Length / stat.BlockSize) +
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(directoryBlocks.Length % stat.BlockSize);
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stat.Length = directoryBlocks.Length;
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}
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else if(string.Compare(path, "$Bitmap", StringComparison.InvariantCulture) == 0)
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{
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stat.Blocks = (blockMapBytes.Length / stat.BlockSize) + (blockMapBytes.Length % stat.BlockSize);
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stat.Length = blockMapBytes.Length;
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}
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else if(string.Compare(path, "$Boot", StringComparison.InvariantCulture) == 0 &&
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bootBlocks != null)
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{
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stat.Blocks = (bootBlocks.Length / stat.BlockSize) + (bootBlocks.Length % stat.BlockSize);
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stat.Length = bootBlocks.Length;
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}
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else if(string.Compare(path, "$MDB", StringComparison.InvariantCulture) == 0)
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{
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stat.Blocks = (mdbBlocks.Length / stat.BlockSize) + (mdbBlocks.Length % stat.BlockSize);
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stat.Length = mdbBlocks.Length;
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}
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else
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return Errno.InvalidArgument;
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return Errno.NoError;
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}
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if(!filenameToId.TryGetValue(path.ToLowerInvariant(), out uint fileId))
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return Errno.NoSuchFile;
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if(!idToEntry.TryGetValue(fileId, out FileEntry entry))
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return Errno.NoSuchFile;
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Errno error = GetAttributes(path, out FileAttributes attr);
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if(error != Errno.NoError)
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return error;
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stat = new FileEntryInfo
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{
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Attributes = attr, Blocks = entry.flLgLen / volMDB.drAlBlkSiz,
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BlockSize = volMDB.drAlBlkSiz,
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CreationTime = DateHandlers.MacToDateTime(entry.flCrDat), Inode = entry.flFlNum,
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LastWriteTime = DateHandlers.MacToDateTime(entry.flMdDat), Length = entry.flPyLen, Links = 1
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};
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return Errno.NoError;
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}
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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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return Errno.NotImplemented;
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}
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Errno ReadFile(string path, out byte[] buf, bool resourceFork, bool tags)
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{
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buf = null;
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if(!mounted)
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return Errno.AccessDenied;
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string[] pathElements = path.Split(new[]
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{
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'/'
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}, StringSplitOptions.RemoveEmptyEntries);
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if(pathElements.Length != 1)
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return Errno.NotSupported;
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path = pathElements[0];
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if(!filenameToId.TryGetValue(path.ToLowerInvariant(), out uint fileId))
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return Errno.NoSuchFile;
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if(!idToEntry.TryGetValue(fileId, out FileEntry entry))
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return Errno.NoSuchFile;
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uint nextBlock;
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if(resourceFork)
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{
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if(entry.flRPyLen == 0)
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{
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buf = new byte[0];
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return Errno.NoError;
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}
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nextBlock = entry.flRStBlk;
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}
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else
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{
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if(entry.flPyLen == 0)
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{
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buf = new byte[0];
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return Errno.NoError;
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}
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nextBlock = entry.flStBlk;
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}
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var ms = new MemoryStream();
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do
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{
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byte[] sectors;
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if(tags)
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sectors =
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device.ReadSectorsTag((ulong)((nextBlock - 2) * sectorsPerBlock) + volMDB.drAlBlSt + partitionStart,
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(uint)sectorsPerBlock, SectorTagType.AppleSectorTag);
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else
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sectors =
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device.ReadSectors((ulong)((nextBlock - 2) * sectorsPerBlock) + volMDB.drAlBlSt + partitionStart,
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(uint)sectorsPerBlock);
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ms.Write(sectors, 0, sectors.Length);
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if(blockMap[nextBlock] == BMAP_FREE)
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{
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DicConsole.ErrorWriteLine("File truncated at block {0}", nextBlock);
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break;
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}
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nextBlock = blockMap[nextBlock];
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} while(nextBlock > BMAP_LAST);
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if(tags)
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buf = ms.ToArray();
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else
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{
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if(resourceFork)
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if(ms.Length < entry.flRLgLen)
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buf = ms.ToArray();
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else
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{
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buf = new byte[entry.flRLgLen];
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Array.Copy(ms.ToArray(), 0, buf, 0, buf.Length);
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}
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else
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{
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if(ms.Length < entry.flLgLen)
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buf = ms.ToArray();
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else
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{
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buf = new byte[entry.flLgLen];
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Array.Copy(ms.ToArray(), 0, buf, 0, buf.Length);
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}
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}
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}
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return Errno.NoError;
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}
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}
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} |