mirror of
https://github.com/aaru-dps/Aaru.git
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614 lines
21 KiB
C#
614 lines
21 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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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 : ISO9660 filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Handles file and 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 © 2011-2022 Natalia Portillo
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// In the loving memory of Facunda "Tata" Suárez Domínguez, R.I.P. 2019/07/24
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// ****************************************************************************/
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namespace Aaru.Filesystems;
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Runtime.CompilerServices;
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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 Aaru.Helpers;
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using FileAttributes = Aaru.CommonTypes.Structs.FileAttributes;
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public sealed partial class ISO9660
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{
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/// <inheritdoc />
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public ErrorNumber MapBlock(string path, long fileBlock, out long deviceBlock)
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{
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deviceBlock = 0;
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if(!_mounted)
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return ErrorNumber.AccessDenied;
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ErrorNumber err = GetFileEntry(path, out DecodedDirectoryEntry entry);
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if(err != ErrorNumber.NoError)
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return err;
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if(entry.Flags.HasFlag(FileFlags.Directory) &&
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!_debug)
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return ErrorNumber.IsDirectory;
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// TODO: Multi-extents
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if(entry.Extents.Count > 1)
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return ErrorNumber.NotImplemented;
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deviceBlock = entry.Extents[0].extent + fileBlock;
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber 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 ErrorNumber.AccessDenied;
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ErrorNumber err = Stat(path, out FileEntryInfo stat);
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if(err != ErrorNumber.NoError)
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return err;
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attributes = stat.Attributes;
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return ErrorNumber.NoError;
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}
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// TODO: Resolve symbolic link
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/// <inheritdoc />
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public ErrorNumber Read(string path, long offset, long size, ref byte[] buf)
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{
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buf = null;
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if(!_mounted)
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return ErrorNumber.AccessDenied;
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ErrorNumber err = GetFileEntry(path, out DecodedDirectoryEntry entry);
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if(err != ErrorNumber.NoError)
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return err;
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if(entry.Flags.HasFlag(FileFlags.Directory) &&
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!_debug)
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return ErrorNumber.IsDirectory;
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if(entry.Extents is null)
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return ErrorNumber.InvalidArgument;
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if(entry.Size == 0)
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{
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buf = Array.Empty<byte>();
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return ErrorNumber.NoError;
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}
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if(offset >= (long)entry.Size)
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return ErrorNumber.InvalidArgument;
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if(size + offset >= (long)entry.Size)
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size = (long)entry.Size - offset;
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offset += entry.XattrLength * _blockSize;
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if(entry.CdiSystemArea?.attributes.HasFlag(CdiAttributes.DigitalAudio) != true ||
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entry.Extents.Count != 1)
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return ReadWithExtents(offset, size, entry.Extents,
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entry.XA?.signature == XA_MAGIC &&
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entry.XA?.attributes.HasFlag(XaAttributes.Interleaved) == true,
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entry.XA?.filenumber ?? 0, out buf);
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try
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{
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long firstSector = offset / 2352;
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long offsetInSector = offset % 2352;
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long sizeInSectors = (size + offsetInSector) / 2352;
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if((size + offsetInSector) % 2352 > 0)
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sizeInSectors++;
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ErrorNumber errno = _image.ReadSectorsLong((ulong)(entry.Extents[0].extent + firstSector),
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(uint)sizeInSectors, out byte[] buffer);
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if(errno != ErrorNumber.NoError)
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return errno;
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buf = new byte[size];
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Array.Copy(buffer, offsetInSector, buf, 0, size);
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return ErrorNumber.NoError;
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}
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catch(Exception e)
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{
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AaruConsole.DebugWriteLine("ISO9660 plugin", "Exception reading CD-i audio file");
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AaruConsole.DebugWriteLine("ISO9660 plugin", "{0}", e);
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return ErrorNumber.UnexpectedException;
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}
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return ReadWithExtents(offset, size, entry.Extents,
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entry.XA?.signature == XA_MAGIC &&
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entry.XA?.attributes.HasFlag(XaAttributes.Interleaved) == true,
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entry.XA?.filenumber ?? 0, out buf);
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}
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/// <inheritdoc />
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public ErrorNumber 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 ErrorNumber.AccessDenied;
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ErrorNumber err = GetFileEntry(path, out DecodedDirectoryEntry entry);
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if(err != ErrorNumber.NoError)
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return err;
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stat = new FileEntryInfo
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{
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Attributes = new FileAttributes(),
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Blocks = (long)(entry.Size / 2048), // TODO: XA
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BlockSize = 2048,
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Length = (long)entry.Size,
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Links = 1,
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LastWriteTimeUtc = entry.Timestamp
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};
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if(entry.Extents?.Count > 0)
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stat.Inode = entry.Extents[0].extent;
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if(entry.Size % 2048 > 0)
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stat.Blocks++;
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if(entry.Flags.HasFlag(FileFlags.Directory))
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stat.Attributes |= FileAttributes.Directory;
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if(entry.Flags.HasFlag(FileFlags.Hidden))
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stat.Attributes |= FileAttributes.Hidden;
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if(entry.FinderInfo?.fdFlags.HasFlag(AppleCommon.FinderFlags.kIsAlias) == true)
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stat.Attributes |= FileAttributes.Alias;
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if(entry.FinderInfo?.fdFlags.HasFlag(AppleCommon.FinderFlags.kIsInvisible) == true)
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stat.Attributes |= FileAttributes.Hidden;
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if(entry.FinderInfo?.fdFlags.HasFlag(AppleCommon.FinderFlags.kHasBeenInited) == true)
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stat.Attributes |= FileAttributes.HasBeenInited;
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if(entry.FinderInfo?.fdFlags.HasFlag(AppleCommon.FinderFlags.kHasCustomIcon) == true)
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stat.Attributes |= FileAttributes.HasCustomIcon;
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if(entry.FinderInfo?.fdFlags.HasFlag(AppleCommon.FinderFlags.kHasNoINITs) == true)
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stat.Attributes |= FileAttributes.HasNoINITs;
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if(entry.FinderInfo?.fdFlags.HasFlag(AppleCommon.FinderFlags.kIsOnDesk) == true)
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stat.Attributes |= FileAttributes.IsOnDesk;
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if(entry.FinderInfo?.fdFlags.HasFlag(AppleCommon.FinderFlags.kIsShared) == true)
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stat.Attributes |= FileAttributes.Shared;
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if(entry.FinderInfo?.fdFlags.HasFlag(AppleCommon.FinderFlags.kIsStationery) == true)
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stat.Attributes |= FileAttributes.Stationery;
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if(entry.FinderInfo?.fdFlags.HasFlag(AppleCommon.FinderFlags.kHasBundle) == true)
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stat.Attributes |= FileAttributes.Bundle;
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if(entry.AppleIcon != null)
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stat.Attributes |= FileAttributes.HasCustomIcon;
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if(entry.XA != null)
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{
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if(entry.XA.Value.attributes.HasFlag(XaAttributes.GroupExecute))
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stat.Mode |= 8;
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if(entry.XA.Value.attributes.HasFlag(XaAttributes.GroupRead))
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stat.Mode |= 32;
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if(entry.XA.Value.attributes.HasFlag(XaAttributes.OwnerExecute))
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stat.Mode |= 64;
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if(entry.XA.Value.attributes.HasFlag(XaAttributes.OwnerRead))
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stat.Mode |= 256;
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if(entry.XA.Value.attributes.HasFlag(XaAttributes.SystemExecute))
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stat.Mode |= 1;
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if(entry.XA.Value.attributes.HasFlag(XaAttributes.SystemRead))
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stat.Mode |= 4;
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stat.UID = entry.XA.Value.user;
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stat.GID = entry.XA.Value.group;
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stat.Inode = entry.XA.Value.filenumber;
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}
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if(entry.PosixAttributes != null)
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{
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stat.Mode = (uint?)entry.PosixAttributes.Value.st_mode & 0x0FFF;
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if(entry.PosixAttributes.Value.st_mode.HasFlag(PosixMode.Block))
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stat.Attributes |= FileAttributes.BlockDevice;
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if(entry.PosixAttributes.Value.st_mode.HasFlag(PosixMode.Character))
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stat.Attributes |= FileAttributes.CharDevice;
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if(entry.PosixAttributes.Value.st_mode.HasFlag(PosixMode.Pipe))
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stat.Attributes |= FileAttributes.Pipe;
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if(entry.PosixAttributes.Value.st_mode.HasFlag(PosixMode.Socket))
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stat.Attributes |= FileAttributes.Socket;
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if(entry.PosixAttributes.Value.st_mode.HasFlag(PosixMode.Symlink))
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stat.Attributes |= FileAttributes.Symlink;
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stat.Links = entry.PosixAttributes.Value.st_nlink;
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stat.UID = entry.PosixAttributes.Value.st_uid;
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stat.GID = entry.PosixAttributes.Value.st_gid;
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stat.Inode = entry.PosixAttributes.Value.st_ino;
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}
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else if(entry.PosixAttributesOld != null)
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{
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stat.Mode = (uint?)entry.PosixAttributesOld.Value.st_mode & 0x0FFF;
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if(entry.PosixAttributesOld.Value.st_mode.HasFlag(PosixMode.Block))
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stat.Attributes |= FileAttributes.BlockDevice;
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if(entry.PosixAttributesOld.Value.st_mode.HasFlag(PosixMode.Character))
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stat.Attributes |= FileAttributes.CharDevice;
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if(entry.PosixAttributesOld.Value.st_mode.HasFlag(PosixMode.Pipe))
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stat.Attributes |= FileAttributes.Pipe;
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if(entry.PosixAttributesOld.Value.st_mode.HasFlag(PosixMode.Socket))
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stat.Attributes |= FileAttributes.Socket;
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if(entry.PosixAttributesOld.Value.st_mode.HasFlag(PosixMode.Symlink))
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stat.Attributes |= FileAttributes.Symlink;
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stat.Links = entry.PosixAttributesOld.Value.st_nlink;
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stat.UID = entry.PosixAttributesOld.Value.st_uid;
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stat.GID = entry.PosixAttributesOld.Value.st_gid;
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}
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if(entry.AmigaProtection != null)
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{
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if(entry.AmigaProtection.Value.Multiuser.HasFlag(AmigaMultiuser.GroupExec))
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stat.Mode |= 8;
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if(entry.AmigaProtection.Value.Multiuser.HasFlag(AmigaMultiuser.GroupRead))
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stat.Mode |= 32;
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if(entry.AmigaProtection.Value.Multiuser.HasFlag(AmigaMultiuser.GroupWrite))
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stat.Mode |= 16;
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if(entry.AmigaProtection.Value.Multiuser.HasFlag(AmigaMultiuser.OtherExec))
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stat.Mode |= 1;
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if(entry.AmigaProtection.Value.Multiuser.HasFlag(AmigaMultiuser.OtherRead))
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stat.Mode |= 4;
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if(entry.AmigaProtection.Value.Multiuser.HasFlag(AmigaMultiuser.OtherWrite))
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stat.Mode |= 2;
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if(entry.AmigaProtection.Value.Protection.HasFlag(AmigaAttributes.OwnerExec))
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stat.Mode |= 64;
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if(entry.AmigaProtection.Value.Protection.HasFlag(AmigaAttributes.OwnerRead))
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stat.Mode |= 256;
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if(entry.AmigaProtection.Value.Protection.HasFlag(AmigaAttributes.OwnerWrite))
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stat.Mode |= 128;
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if(entry.AmigaProtection.Value.Protection.HasFlag(AmigaAttributes.Archive))
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stat.Attributes |= FileAttributes.Archive;
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}
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if(entry.PosixDeviceNumber != null)
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stat.DeviceNo = ((ulong)entry.PosixDeviceNumber.Value.dev_t_high << 32) +
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entry.PosixDeviceNumber.Value.dev_t_low;
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if(entry.RripModify != null)
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stat.LastWriteTimeUtc = DecodeIsoDateTime(entry.RripModify);
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if(entry.RripAccess != null)
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stat.AccessTimeUtc = DecodeIsoDateTime(entry.RripAccess);
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if(entry.RripAttributeChange != null)
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stat.StatusChangeTimeUtc = DecodeIsoDateTime(entry.RripAttributeChange);
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if(entry.RripBackup != null)
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stat.BackupTimeUtc = DecodeIsoDateTime(entry.RripBackup);
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if(entry.SymbolicLink != null)
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stat.Attributes |= FileAttributes.Symlink;
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if(entry.XattrLength == 0 ||
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_cdi ||
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_highSierra)
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return ErrorNumber.NoError;
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if(entry.CdiSystemArea != null)
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{
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stat.UID = entry.CdiSystemArea.Value.owner;
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stat.GID = entry.CdiSystemArea.Value.group;
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if(entry.CdiSystemArea.Value.attributes.HasFlag(CdiAttributes.GroupExecute))
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stat.Mode |= 8;
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if(entry.CdiSystemArea.Value.attributes.HasFlag(CdiAttributes.GroupRead))
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stat.Mode |= 32;
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if(entry.CdiSystemArea.Value.attributes.HasFlag(CdiAttributes.OtherExecute))
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stat.Mode |= 1;
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if(entry.CdiSystemArea.Value.attributes.HasFlag(CdiAttributes.OtherRead))
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stat.Mode |= 4;
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if(entry.CdiSystemArea.Value.attributes.HasFlag(CdiAttributes.OwnerExecute))
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stat.Mode |= 64;
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if(entry.CdiSystemArea.Value.attributes.HasFlag(CdiAttributes.OwnerRead))
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stat.Mode |= 256;
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}
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ErrorNumber errno = ReadSingleExtent(entry.XattrLength * _blockSize, entry.Extents[0].extent, out byte[] ea);
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if(errno != ErrorNumber.NoError)
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return ErrorNumber.NoError;
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ExtendedAttributeRecord ear = Marshal.ByteArrayToStructureLittleEndian<ExtendedAttributeRecord>(ea);
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stat.UID = ear.owner;
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stat.GID = ear.group;
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stat.Mode = 0;
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if(ear.permissions.HasFlag(Permissions.GroupExecute))
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stat.Mode |= 8;
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if(ear.permissions.HasFlag(Permissions.GroupRead))
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stat.Mode |= 32;
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if(ear.permissions.HasFlag(Permissions.OwnerExecute))
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stat.Mode |= 64;
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if(ear.permissions.HasFlag(Permissions.OwnerRead))
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stat.Mode |= 256;
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if(ear.permissions.HasFlag(Permissions.OtherExecute))
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stat.Mode |= 1;
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if(ear.permissions.HasFlag(Permissions.OtherRead))
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stat.Mode |= 4;
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stat.CreationTimeUtc = DateHandlers.Iso9660ToDateTime(ear.creation_date);
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stat.LastWriteTimeUtc = DateHandlers.Iso9660ToDateTime(ear.modification_date);
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber ReadLink(string path, out string dest)
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{
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dest = null;
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ErrorNumber err = GetFileEntry(path, out DecodedDirectoryEntry entry);
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if(err != ErrorNumber.NoError)
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return err;
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if(entry.SymbolicLink is null)
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return ErrorNumber.InvalidArgument;
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dest = entry.SymbolicLink;
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return ErrorNumber.NoError;
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}
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ErrorNumber GetFileEntry(string path, out DecodedDirectoryEntry entry)
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{
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entry = null;
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string cutPath = path.StartsWith("/", StringComparison.Ordinal)
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? path[1..].ToLower(CultureInfo.CurrentUICulture)
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: path.ToLower(CultureInfo.CurrentUICulture);
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string[] pieces = cutPath.Split(new[]
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{
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'/'
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}, StringSplitOptions.RemoveEmptyEntries);
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if(pieces.Length == 0)
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return ErrorNumber.InvalidArgument;
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var parentPath = string.Join("/", pieces, 0, pieces.Length - 1);
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if(!_directoryCache.TryGetValue(parentPath, out _))
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{
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ErrorNumber err = ReadDir(parentPath, out _);
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if(err != ErrorNumber.NoError)
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return err;
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}
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Dictionary<string, DecodedDirectoryEntry> parent;
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if(pieces.Length == 1)
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parent = _rootDirectoryCache;
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else if(!_directoryCache.TryGetValue(parentPath, out parent))
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return ErrorNumber.InvalidArgument;
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KeyValuePair<string, DecodedDirectoryEntry> dirent =
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parent.FirstOrDefault(t => t.Key.ToLower(CultureInfo.CurrentUICulture) == pieces[^1]);
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if(string.IsNullOrEmpty(dirent.Key))
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{
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if(!_joliet &&
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!pieces[^1].EndsWith(";1", StringComparison.Ordinal))
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{
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dirent = parent.FirstOrDefault(t => t.Key.ToLower(CultureInfo.CurrentUICulture) == pieces[^1] + ";1");
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if(string.IsNullOrEmpty(dirent.Key))
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return ErrorNumber.NoSuchFile;
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}
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else
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return ErrorNumber.NoSuchFile;
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}
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entry = dirent.Value;
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return ErrorNumber.NoError;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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ErrorNumber ReadSingleExtent(long size, uint startingSector, out byte[] buffer, bool interleaved = false,
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byte fileNumber = 0) => ReadWithExtents(0, size, new List<(uint extent, uint size)>
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{
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(startingSector, (uint)size)
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}, interleaved, fileNumber, out buffer);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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ErrorNumber ReadSingleExtent(long offset, long size, uint startingSector, out byte[] buffer,
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bool interleaved = false, byte fileNumber = 0) => ReadWithExtents(offset, size,
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new List<(uint extent, uint size)>
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{
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(startingSector, (uint)size)
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}, interleaved, fileNumber, out buffer);
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// Cannot think how to make this faster, as we don't know the mode sector until it is read, but we have size in bytes
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ErrorNumber ReadWithExtents(long offset, long size, List<(uint extent, uint size)> extents, bool interleaved,
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byte fileNumber, out byte[] buffer)
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{
|
|
var ms = new MemoryStream();
|
|
long currentFilePos = 0;
|
|
|
|
for(var i = 0; i < extents.Count; i++)
|
|
{
|
|
if(offset - currentFilePos >= extents[i].size)
|
|
{
|
|
currentFilePos += extents[i].size;
|
|
|
|
continue;
|
|
}
|
|
|
|
long leftExtentSize = extents[i].size;
|
|
uint currentExtentSector = 0;
|
|
|
|
while(leftExtentSize > 0)
|
|
{
|
|
ErrorNumber errno = ReadSector(extents[i].extent + currentExtentSector, out byte[] sector, interleaved,
|
|
fileNumber);
|
|
|
|
if(errno != ErrorNumber.NoError)
|
|
{
|
|
buffer = ms.ToArray();
|
|
|
|
return errno;
|
|
}
|
|
|
|
if(sector is null)
|
|
{
|
|
currentExtentSector++;
|
|
leftExtentSize -= 2048;
|
|
currentFilePos += 2048;
|
|
|
|
continue;
|
|
}
|
|
|
|
if(offset - currentFilePos > sector.Length)
|
|
{
|
|
currentExtentSector++;
|
|
leftExtentSize -= sector.Length;
|
|
currentFilePos += sector.Length;
|
|
|
|
continue;
|
|
}
|
|
|
|
if(offset - currentFilePos > 0)
|
|
ms.Write(sector, (int)(offset - currentFilePos), (int)(sector.Length - (offset - currentFilePos)));
|
|
else
|
|
ms.Write(sector, 0, sector.Length);
|
|
|
|
currentExtentSector++;
|
|
leftExtentSize -= sector.Length;
|
|
currentFilePos += sector.Length;
|
|
|
|
if(ms.Length >= size)
|
|
break;
|
|
}
|
|
|
|
if(ms.Length >= size)
|
|
break;
|
|
}
|
|
|
|
if(ms.Length >= size)
|
|
ms.SetLength(size);
|
|
|
|
buffer = ms.ToArray();
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
|
|
byte[] ReadSubheaderWithExtents(List<(uint extent, uint size)> extents, bool copy)
|
|
{
|
|
var ms = new MemoryStream();
|
|
|
|
for(var i = 0; i < extents.Count; i++)
|
|
{
|
|
long leftExtentSize = extents[i].size;
|
|
uint currentExtentSector = 0;
|
|
|
|
while(leftExtentSize > 0)
|
|
{
|
|
ErrorNumber errno = _image.ReadSectorTag((extents[i].extent + currentExtentSector) * _blockSize / 2048,
|
|
SectorTagType.CdSectorSubHeader, out byte[] fullSector);
|
|
|
|
if(errno != ErrorNumber.NoError)
|
|
return null;
|
|
|
|
ms.Write(fullSector, copy ? 0 : 4, 4);
|
|
|
|
currentExtentSector++;
|
|
leftExtentSize -= 2048;
|
|
}
|
|
}
|
|
|
|
return ms.ToArray();
|
|
}
|
|
} |