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302 lines
12 KiB
C#
302 lines
12 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Super.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : FATX filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Handles mounting and umounting the FATX filesystem.
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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 © 2011-2021 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.Globalization;
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using System.Runtime.InteropServices;
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using System.Text;
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using Aaru.CommonTypes;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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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 Schemas;
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using Marshal = Aaru.Helpers.Marshal;
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namespace Aaru.Filesystems
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{
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public sealed partial class XboxFatPlugin
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{
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/// <inheritdoc />
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public ErrorNumber Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding,
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Dictionary<string, string> options, string @namespace)
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{
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Encoding = Encoding.GetEncoding("iso-8859-15");
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_littleEndian = true;
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options ??= GetDefaultOptions();
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if(options.TryGetValue("debug", out string debugString))
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bool.TryParse(debugString, out _debug);
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if(imagePlugin.Info.SectorSize < 512)
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return ErrorNumber.InvalidArgument;
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "Reading superblock");
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ErrorNumber errno = imagePlugin.ReadSector(partition.Start, out byte[] sector);
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if(errno != ErrorNumber.NoError)
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return errno;
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_superblock = Marshal.ByteArrayToStructureLittleEndian<Superblock>(sector);
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if(_superblock.magic == FATX_CIGAM)
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{
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_superblock = Marshal.ByteArrayToStructureBigEndian<Superblock>(sector);
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_littleEndian = false;
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}
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if(_superblock.magic != FATX_MAGIC)
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return ErrorNumber.InvalidArgument;
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AaruConsole.DebugWriteLine("Xbox FAT plugin",
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_littleEndian ? "Filesystem is little endian" : "Filesystem is big endian");
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int logicalSectorsPerPhysicalSectors = partition.Offset == 0 && _littleEndian ? 8 : 1;
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "logicalSectorsPerPhysicalSectors = {0}",
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logicalSectorsPerPhysicalSectors);
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string volumeLabel = StringHandlers.CToString(_superblock.volumeLabel,
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!_littleEndian ? Encoding.BigEndianUnicode : Encoding.Unicode,
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true);
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XmlFsType = new FileSystemType
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{
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Type = "FATX filesystem",
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ClusterSize = (uint)(_superblock.sectorsPerCluster * logicalSectorsPerPhysicalSectors *
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imagePlugin.Info.SectorSize),
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VolumeName = volumeLabel,
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VolumeSerial = $"{_superblock.id:X8}"
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};
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XmlFsType.Clusters = (partition.End - partition.Start + 1) * imagePlugin.Info.SectorSize /
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XmlFsType.ClusterSize;
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_statfs = new FileSystemInfo
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{
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Blocks = XmlFsType.Clusters,
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FilenameLength = MAX_FILENAME,
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Files = 0, // Requires traversing all directories
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FreeFiles = 0,
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Id =
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{
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IsInt = true,
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Serial32 = _superblock.magic
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},
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PluginId = Id,
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Type = _littleEndian ? "Xbox FAT" : "Xbox 360 FAT",
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FreeBlocks = 0 // Requires traversing the FAT
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};
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "XmlFsType.ClusterSize: {0}", XmlFsType.ClusterSize);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "XmlFsType.VolumeName: {0}", XmlFsType.VolumeName);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "XmlFsType.VolumeSerial: {0}", XmlFsType.VolumeSerial);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "stat.Blocks: {0}", _statfs.Blocks);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "stat.FilenameLength: {0}", _statfs.FilenameLength);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "stat.Id: {0}", _statfs.Id.Serial32);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "stat.Type: {0}", _statfs.Type);
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byte[] buffer;
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_fatStartSector = (FAT_START / imagePlugin.Info.SectorSize) + partition.Start;
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uint fatSize;
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "fatStartSector: {0}", _fatStartSector);
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if(_statfs.Blocks > MAX_XFAT16_CLUSTERS)
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{
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "Reading FAT32");
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fatSize = (uint)((_statfs.Blocks + 1) * sizeof(uint) / imagePlugin.Info.SectorSize);
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if((uint)((_statfs.Blocks + 1) * sizeof(uint) % imagePlugin.Info.SectorSize) > 0)
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fatSize++;
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long fatClusters = fatSize * imagePlugin.Info.SectorSize / 4096;
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if(fatSize * imagePlugin.Info.SectorSize % 4096 > 0)
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fatClusters++;
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fatSize = (uint)(fatClusters * 4096 / imagePlugin.Info.SectorSize);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "FAT is {0} sectors", fatSize);
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errno = imagePlugin.ReadSectors(_fatStartSector, fatSize, out buffer);
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if(errno != ErrorNumber.NoError)
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return errno;
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "Casting FAT");
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_fat32 = MemoryMarshal.Cast<byte, uint>(buffer).ToArray();
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if(!_littleEndian)
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for(int i = 0; i < _fat32.Length; i++)
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_fat32[i] = Swapping.Swap(_fat32[i]);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "fat32[0] == FATX32_ID = {0}", _fat32[0] == FATX32_ID);
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if(_fat32[0] != FATX32_ID)
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return ErrorNumber.InvalidArgument;
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}
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else
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{
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "Reading FAT16");
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fatSize = (uint)((_statfs.Blocks + 1) * sizeof(ushort) / imagePlugin.Info.SectorSize);
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if((uint)((_statfs.Blocks + 1) * sizeof(ushort) % imagePlugin.Info.SectorSize) > 0)
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fatSize++;
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long fatClusters = fatSize * imagePlugin.Info.SectorSize / 4096;
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if(fatSize * imagePlugin.Info.SectorSize % 4096 > 0)
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fatClusters++;
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fatSize = (uint)(fatClusters * 4096 / imagePlugin.Info.SectorSize);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "FAT is {0} sectors", fatSize);
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errno = imagePlugin.ReadSectors(_fatStartSector, fatSize, out buffer);
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if(errno != ErrorNumber.NoError)
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return errno;
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "Casting FAT");
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_fat16 = MemoryMarshal.Cast<byte, ushort>(buffer).ToArray();
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if(!_littleEndian)
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for(int i = 0; i < _fat16.Length; i++)
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_fat16[i] = Swapping.Swap(_fat16[i]);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "fat16[0] == FATX16_ID = {0}", _fat16[0] == FATX16_ID);
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if(_fat16[0] != FATX16_ID)
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return ErrorNumber.InvalidArgument;
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}
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_sectorsPerCluster = (uint)(_superblock.sectorsPerCluster * logicalSectorsPerPhysicalSectors);
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_imagePlugin = imagePlugin;
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_firstClusterSector = _fatStartSector + fatSize;
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_bytesPerCluster = _sectorsPerCluster * imagePlugin.Info.SectorSize;
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "sectorsPerCluster = {0}", _sectorsPerCluster);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "bytesPerCluster = {0}", _bytesPerCluster);
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "firstClusterSector = {0}", _firstClusterSector);
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uint[] rootDirectoryClusters = GetClusters(_superblock.rootDirectoryCluster);
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if(rootDirectoryClusters is null)
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return ErrorNumber.InvalidArgument;
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byte[] rootDirectoryBuffer = new byte[_bytesPerCluster * rootDirectoryClusters.Length];
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AaruConsole.DebugWriteLine("Xbox FAT plugin", "Reading root directory");
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for(int i = 0; i < rootDirectoryClusters.Length; i++)
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{
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errno =
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imagePlugin.ReadSectors(_firstClusterSector + ((rootDirectoryClusters[i] - 1) * _sectorsPerCluster),
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_sectorsPerCluster, out buffer);
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if(errno != ErrorNumber.NoError)
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return errno;
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Array.Copy(buffer, 0, rootDirectoryBuffer, i * _bytesPerCluster, _bytesPerCluster);
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}
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_rootDirectory = new Dictionary<string, DirectoryEntry>();
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int pos = 0;
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while(pos < rootDirectoryBuffer.Length)
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{
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DirectoryEntry entry = _littleEndian
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? Marshal.
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ByteArrayToStructureLittleEndian<
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DirectoryEntry>(rootDirectoryBuffer, pos,
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Marshal.SizeOf<DirectoryEntry>())
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: Marshal.ByteArrayToStructureBigEndian<DirectoryEntry>(rootDirectoryBuffer,
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pos, Marshal.SizeOf<DirectoryEntry>());
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pos += Marshal.SizeOf<DirectoryEntry>();
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if(entry.filenameSize == UNUSED_DIRENTRY ||
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entry.filenameSize == FINISHED_DIRENTRY)
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break;
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if(entry.filenameSize == DELETED_DIRENTRY ||
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entry.filenameSize > MAX_FILENAME)
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continue;
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string filename = Encoding.GetString(entry.filename, 0, entry.filenameSize);
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_rootDirectory.Add(filename, entry);
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}
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_cultureInfo = new CultureInfo("en-US", false);
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_directoryCache = new Dictionary<string, Dictionary<string, DirectoryEntry>>();
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_mounted = true;
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber Unmount()
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{
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if(!_mounted)
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return ErrorNumber.AccessDenied;
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_fat16 = null;
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_fat32 = null;
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_imagePlugin = null;
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_mounted = false;
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber StatFs(out FileSystemInfo stat)
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{
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stat = null;
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if(!_mounted)
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return ErrorNumber.AccessDenied;
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stat = _statfs.ShallowCopy();
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return ErrorNumber.NoError;
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}
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}
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} |