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240 lines
11 KiB
C#
240 lines
11 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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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 © 2011-2019 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Runtime.InteropServices;
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using System.Text;
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using DiscImageChef.CommonTypes;
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using DiscImageChef.CommonTypes.Interfaces;
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using DiscImageChef.CommonTypes.Structs;
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using DiscImageChef.Console;
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using Schemas;
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using Marshal = DiscImageChef.Helpers.Marshal;
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namespace DiscImageChef.Filesystems.FATX
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{
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public partial class XboxFatPlugin
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{
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public Errno Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding,
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Dictionary<string, string> options)
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{
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Encoding = Encoding.GetEncoding("iso-8859-15");
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littleEndian = true;
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if(imagePlugin.Info.SectorSize < 512) return Errno.InvalidArgument;
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DicConsole.DebugWriteLine("Xbox FAT plugin", "Reading superblock");
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byte[] sector = imagePlugin.ReadSector(partition.Start);
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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) return Errno.InvalidArgument;
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DicConsole.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 ? 8 : 1;
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DicConsole.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 =
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(int)(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 = (long)((partition.End - partition.Start + 1) * imagePlugin.Info.SectorSize /
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(ulong)XmlFsType.ClusterSize);
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stat = 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 = {IsInt = true, Serial32 = superblock.magic},
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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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DicConsole.DebugWriteLine("Xbox FAT plugin", "XmlFsType.ClusterSize", XmlFsType.ClusterSize);
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DicConsole.DebugWriteLine("Xbox FAT plugin", "XmlFsType.VolumeName", XmlFsType.VolumeName);
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DicConsole.DebugWriteLine("Xbox FAT plugin", "XmlFsType.VolumeSerial", XmlFsType.VolumeSerial);
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DicConsole.DebugWriteLine("Xbox FAT plugin", "stat.Blocks", stat.Blocks);
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DicConsole.DebugWriteLine("Xbox FAT plugin", "stat.FilenameLength", stat.FilenameLength);
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DicConsole.DebugWriteLine("Xbox FAT plugin", "stat.Id", stat.Id);
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DicConsole.DebugWriteLine("Xbox FAT plugin", "stat.Type", stat.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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DicConsole.DebugWriteLine("Xbox FAT plugin", "fatStartSector", fatStartSector);
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if(stat.Blocks > MAX_XFAT16_CLUSTERS)
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{
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DicConsole.DebugWriteLine("Xbox FAT plugin", "Reading FAT32");
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fatSize = (uint)(stat.Blocks * sizeof(uint) / imagePlugin.Info.SectorSize);
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if((uint)(stat.Blocks * sizeof(uint) % imagePlugin.Info.SectorSize) > 0) fatSize++;
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DicConsole.DebugWriteLine("Xbox FAT plugin", "FAT is {0} sectors", fatSize);
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buffer = imagePlugin.ReadSectors(fatStartSector, fatSize);
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DicConsole.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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DicConsole.DebugWriteLine("Xbox FAT plugin", "fat32[0] == FATX32_ID = {0}", fat32[0] == FATX32_ID);
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if(fat32[0] != FATX32_ID) return Errno.InvalidArgument;
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}
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else
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{
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DicConsole.DebugWriteLine("Xbox FAT plugin", "Reading FAT16");
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fatSize = (uint)(stat.Blocks * sizeof(ushort) / imagePlugin.Info.SectorSize);
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if((uint)(stat.Blocks * sizeof(ushort) % imagePlugin.Info.SectorSize) > 0) fatSize++;
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DicConsole.DebugWriteLine("Xbox FAT plugin", "FAT is {0} sectors", fatSize);
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buffer = imagePlugin.ReadSectors(fatStartSector, fatSize);
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DicConsole.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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DicConsole.DebugWriteLine("Xbox FAT plugin", "fat16[0] == FATX16_ID = {0}", fat16[0] == FATX16_ID);
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if(fat16[0] != FATX16_ID) return Errno.InvalidArgument;
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}
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sectorsPerCluster = (uint)(superblock.sectorsPerCluster * logicalSectorsPerPhysicalSectors);
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this.partition = partition;
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this.imagePlugin = imagePlugin;
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firstClusterSector = fatStartSector + fatSize;
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bytesPerCluster = sectorsPerCluster * imagePlugin.Info.SectorSize;
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DicConsole.DebugWriteLine("Xbox FAT plugin", "sectorsPerCluster = {0}", sectorsPerCluster);
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DicConsole.DebugWriteLine("Xbox FAT plugin", "bytesPerCluster = {0}", bytesPerCluster);
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DicConsole.DebugWriteLine("Xbox FAT plugin", "firstClusterSector = {0}", firstClusterSector);
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uint[] rootDirectoryClusters = GetClusters(superblock.rootDirectoryCluster);
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if(rootDirectoryClusters is null) return Errno.InvalidArgument;
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byte[] rootDirectoryBuffer = new byte[bytesPerCluster * rootDirectoryClusters.Length];
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DicConsole.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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buffer =
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imagePlugin.ReadSectors(firstClusterSector + (rootDirectoryClusters[i] - 1) * sectorsPerCluster,
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sectorsPerCluster);
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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<DirectoryEntry
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>(rootDirectoryBuffer, pos, Marshal.SizeOf<DirectoryEntry>())
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: Marshal.ByteArrayToStructureBigEndian<DirectoryEntry>(rootDirectoryBuffer,
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pos,
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Marshal
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.SizeOf<
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DirectoryEntry
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>());
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pos += Marshal.SizeOf<DirectoryEntry>();
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if(entry.filenameSize == UNUSED_DIRENTRY || entry.filenameSize == FINISHED_DIRENTRY) break;
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if(entry.filenameSize == DELETED_DIRENTRY || entry.filenameSize > MAX_FILENAME) 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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return Errno.NoError;
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}
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public Errno Unmount()
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{
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if(!mounted) return Errno.AccessDenied;
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fat16 = null;
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fat32 = null;
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imagePlugin = null;
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partition = new Partition();
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mounted = false;
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return Errno.NoError;
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}
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public Errno StatFs(out FileSystemInfo stat)
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{
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stat = null;
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if(!mounted) return Errno.AccessDenied;
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stat = this.stat;
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return Errno.NoError;
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}
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}
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} |