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Calculate size of Xbox FAT and read it to memory.

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This commit is contained in:
Natalia Portillo
2019-04-07 11:41:35 +01:00
parent e6a9144259
commit 6d43c83712
5 changed files with 196 additions and 13 deletions
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14
DiscImageChef.Filesystems/FATX/Consts.cs
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@@ -36,11 +36,15 @@ namespace DiscImageChef.Filesystems.FATX
{
public partial class XboxFatPlugin
{
const uint FATX_MAGIC = 0x58544146;
const uint FATX_CIGAM = 0x46415458;
const byte UNUSED_DIRENTRY = 0x00;
const byte DELETED_DIRENTRY = 0xE5;
const byte MAX_FILENAME = 42;
const uint FATX_MAGIC = 0x58544146;
const uint FATX_CIGAM = 0x46415458;
const byte UNUSED_DIRENTRY = 0x00;
const byte DELETED_DIRENTRY = 0xE5;
const byte MAX_FILENAME = 42;
const int MAX_XFAT16_CLUSTERS = 65525;
const int FAT_START = 4096;
const uint FATX32_ID = 0xFFFFFFF8;
const ushort FATX16_ID = 0xFFF8;
[Flags]
enum Attributes : byte

8
DiscImageChef.Filesystems/FATX/Dir.cs
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@@ -38,6 +38,12 @@ namespace DiscImageChef.Filesystems.FATX
{
public partial class XboxFatPlugin
{
public Errno ReadDir(string path, out List<string> contents) => throw new NotImplementedException();
public Errno ReadDir(string path, out List<string> contents)
{
contents = null;
if(!mounted) return Errno.AccessDenied;
throw new NotImplementedException();
}
}
}

13
DiscImageChef.Filesystems/FATX/FATX.cs
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@@ -33,6 +33,7 @@
using System;
using System.Collections.Generic;
using System.Text;
using DiscImageChef.CommonTypes;
using DiscImageChef.CommonTypes.Interfaces;
using DiscImageChef.CommonTypes.Structs;
using Schemas;
@@ -41,6 +42,18 @@ namespace DiscImageChef.Filesystems.FATX
{
public partial class XboxFatPlugin : IReadOnlyFilesystem
{
ushort[] fat16;
uint[] fat32;
ulong fatStartSector;
ulong firstClusterSector;
IMediaImage imagePlugin;
bool littleEndian;
bool mounted;
Partition partition;
uint sectorsPerCluster;
FileSystemInfo stat;
Superblock superblock;
public FileSystemType XmlFsType { get; private set; }
public Encoding Encoding { get; private set; }
public string Name => "FATX Filesystem Plugin";

31
DiscImageChef.Filesystems/FATX/File.cs
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@@ -37,12 +37,35 @@ namespace DiscImageChef.Filesystems.FATX
{
public partial class XboxFatPlugin
{
public Errno MapBlock(string path, long fileBlock, out long deviceBlock) => throw new NotImplementedException();
public Errno MapBlock(string path, long fileBlock, out long deviceBlock)
{
deviceBlock = 0;
if(!mounted) return Errno.AccessDenied;
public Errno GetAttributes(string path, out FileAttributes attributes) => throw new NotImplementedException();
throw new NotImplementedException();
}
public Errno Read(string path, long offset, long size, ref byte[] buf) => throw new NotImplementedException();
public Errno GetAttributes(string path, out FileAttributes attributes)
{
attributes = new FileAttributes();
if(!mounted) return Errno.AccessDenied;
public Errno Stat(string path, out FileEntryInfo stat) => throw new NotImplementedException();
throw new NotImplementedException();
}
public Errno Read(string path, long offset, long size, ref byte[] buf)
{
if(!mounted) return Errno.AccessDenied;
throw new NotImplementedException();
}
public Errno Stat(string path, out FileEntryInfo stat)
{
stat = null;
if(!mounted) return Errno.AccessDenied;
throw new NotImplementedException();
}
}
}

143
DiscImageChef.Filesystems/FATX/Super.cs
View File

@@ -32,21 +32,158 @@
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text;
using DiscImageChef.CommonTypes;
using DiscImageChef.CommonTypes.Interfaces;
using DiscImageChef.CommonTypes.Structs;
using DiscImageChef.Console;
using Schemas;
using Marshal = DiscImageChef.Helpers.Marshal;
namespace DiscImageChef.Filesystems.FATX
{
public partial class XboxFatPlugin
{
public Errno Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding,
Dictionary<string, string> options) =>
Dictionary<string, string> options)
{
Encoding = Encoding.GetEncoding("iso-8859-15");
littleEndian = true;
if(imagePlugin.Info.SectorSize < 512) return Errno.InvalidArgument;
DicConsole.DebugWriteLine("Xbox FAT plugin", "Reading superblock");
byte[] sector = imagePlugin.ReadSector(partition.Start);
superblock = Marshal.ByteArrayToStructureLittleEndian<Superblock>(sector);
if(superblock.magic == FATX_CIGAM)
{
superblock = Marshal.ByteArrayToStructureBigEndian<Superblock>(sector);
littleEndian = false;
}
if(superblock.magic != FATX_MAGIC) return Errno.InvalidArgument;
DicConsole.DebugWriteLine("Xbox FAT plugin",
littleEndian ? "Filesystem is little endian" : "Filesystem is big endian");
int logicalSectorsPerPhysicalSectors = partition.Offset == 0 ? 8 : 1;
DicConsole.DebugWriteLine("Xbox FAT plugin", "logicalSectorsPerPhysicalSectors = {0}",
logicalSectorsPerPhysicalSectors);
string volumeLabel = StringHandlers.CToString(superblock.volumeLabel,
!littleEndian ? Encoding.BigEndianUnicode : Encoding.Unicode,
true);
XmlFsType = new FileSystemType
{
Type = "FATX filesystem",
ClusterSize =
(int)(superblock.sectorsPerCluster * logicalSectorsPerPhysicalSectors *
imagePlugin.Info.SectorSize),
VolumeName = volumeLabel,
VolumeSerial = $"{superblock.id:X8}"
};
XmlFsType.Clusters = (long)((partition.End - partition.Start + 1) * imagePlugin.Info.SectorSize /
(ulong)XmlFsType.ClusterSize);
stat = new FileSystemInfo
{
Blocks = XmlFsType.Clusters,
FilenameLength = MAX_FILENAME,
Files = 0, // Requires traversing all directories
FreeFiles = 0,
Id = {IsInt = true, Serial32 = superblock.magic},
PluginId = Id,
Type = littleEndian ? "Xbox FAT" : "Xbox 360 FAT",
FreeBlocks = 0 // Requires traversing the FAT
};
DicConsole.DebugWriteLine("Xbox FAT plugin", "XmlFsType.ClusterSize", XmlFsType.ClusterSize);
DicConsole.DebugWriteLine("Xbox FAT plugin", "XmlFsType.VolumeName", XmlFsType.VolumeName);
DicConsole.DebugWriteLine("Xbox FAT plugin", "XmlFsType.VolumeSerial", XmlFsType.VolumeSerial);
DicConsole.DebugWriteLine("Xbox FAT plugin", "stat.Blocks", stat.Blocks);
DicConsole.DebugWriteLine("Xbox FAT plugin", "stat.FilenameLength", stat.FilenameLength);
DicConsole.DebugWriteLine("Xbox FAT plugin", "stat.Id", stat.Id);
DicConsole.DebugWriteLine("Xbox FAT plugin", "stat.Type", stat.Type);
byte[] buffer;
fatStartSector = FAT_START / imagePlugin.Info.SectorSize + partition.Start;
uint fatSize;
DicConsole.DebugWriteLine("Xbox FAT plugin", "fatStartSector", fatStartSector);
if(stat.Blocks > MAX_XFAT16_CLUSTERS)
{
DicConsole.DebugWriteLine("Xbox FAT plugin", "Reading FAT32");
fatSize = (uint)(stat.Blocks * sizeof(uint) / imagePlugin.Info.SectorSize);
if((uint)(stat.Blocks * sizeof(uint) % imagePlugin.Info.SectorSize) > 0) fatSize++;
DicConsole.DebugWriteLine("Xbox FAT plugin", "FAT is {0} sectors", fatSize);
buffer = imagePlugin.ReadSectors(fatStartSector, fatSize);
DicConsole.DebugWriteLine("Xbox FAT plugin", "Casting FAT");
fat32 = MemoryMarshal.Cast<byte, uint>(buffer).ToArray();
if(!littleEndian)
for(int i = 0; i < fat32.Length; i++)
fat32[i] = Swapping.Swap(fat32[i]);
DicConsole.DebugWriteLine("Xbox FAT plugin", "fat32[0] == FATX32_ID = {0}", fat32[0] == FATX32_ID);
if(fat32[0] != FATX32_ID) return Errno.InvalidArgument;
}
else
{
DicConsole.DebugWriteLine("Xbox FAT plugin", "Reading FAT16");
fatSize = (uint)(stat.Blocks * sizeof(ushort) / imagePlugin.Info.SectorSize);
if((uint)(stat.Blocks * sizeof(ushort) % imagePlugin.Info.SectorSize) > 0) fatSize++;
DicConsole.DebugWriteLine("Xbox FAT plugin", "FAT is {0} sectors", fatSize);
buffer = imagePlugin.ReadSectors(fatStartSector, fatSize);
DicConsole.DebugWriteLine("Xbox FAT plugin", "Casting FAT");
fat16 = MemoryMarshal.Cast<byte, ushort>(buffer).ToArray();
if(!littleEndian)
for(int i = 0; i < fat16.Length; i++)
fat16[i] = Swapping.Swap(fat16[i]);
DicConsole.DebugWriteLine("Xbox FAT plugin", "fat16[0] == FATX16_ID = {0}", fat16[0] == FATX16_ID);
if(fat16[0] != FATX16_ID) return Errno.InvalidArgument;
}
sectorsPerCluster = (uint)(superblock.sectorsPerCluster * logicalSectorsPerPhysicalSectors);
this.partition = partition;
this.imagePlugin = imagePlugin;
firstClusterSector = fatStartSector + fatSize;
DicConsole.DebugWriteLine("Xbox FAT plugin", "sectorsPerCluster = {0}", sectorsPerCluster);
DicConsole.DebugWriteLine("Xbox FAT plugin", "firstClusterSector = {0}", firstClusterSector);
throw new NotImplementedException();
}
public Errno Unmount() => throw new NotImplementedException();
public Errno Unmount()
{
if(!mounted) return Errno.AccessDenied;
public Errno StatFs(out FileSystemInfo stat) => throw new NotImplementedException();
fat16 = null;
fat32 = null;
imagePlugin = null;
partition = new Partition();
mounted = false;
return Errno.NoError;
}
public Errno StatFs(out FileSystemInfo stat)
{
stat = this.stat;
return !mounted ? Errno.AccessDenied : Errno.NoError;
}
}
}