I am actually trying to extract a Fat Disk Image with DiskUtils but I am not getting the correct file names...
I get "\\TURNER~3\\TOPPER~1.P~1" in place of "\\TURNEROVER\\TOPPERSHEATH.PPTX"
FatFileSystem FatImg = new FatFileSystem(MS); //MS = Fat Image MemoryStream
foreach(DiscDirectoryInfo Di in FatImg.Root.GetDirectories())
{
foreach(DiscFileInfo Fi in Di.GetFiles())
{
Stream St = Fi.OpenRead(); // Correct Stream
string FName = Fi.Name; //Wrong Name
}
}
This is because DiscUtils does not support LFN [Long File Names]...
So I am looking for a perfect library to extract these files befor i try to make one myself...
Is there any way I can Extract it [maybe by DiscUtils] without FileName Errors...
Here is some modifications that you can add to DiscUtils
to support FAT LFN
s:
First, make these changes to the Fat\\Directory.cs
file, like this (you need to add the _lfns
variable, the GetLfnChunk
function, and modify the existing LoadEntries
function to add the lines marked with //+++
below):
internal Dictionary<string, string> _lfns = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
private static string GetLfnChunk(byte[] buffer)
{
// see http://home.teleport.com/~brainy/lfn.htm
// NOTE: we assume ordinals are ok here.
char[] chars = new char[13];
chars[0] = (char)(256 * buffer[2] + buffer[1]);
chars[1] = (char)(256 * buffer[4] + buffer[3]);
chars[2] = (char)(256 * buffer[6] + buffer[5]);
chars[3] = (char)(256 * buffer[8] + buffer[7]);
chars[4] = (char)(256 * buffer[10] + buffer[9]);
chars[5] = (char)(256 * buffer[15] + buffer[14]);
chars[6] = (char)(256 * buffer[17] + buffer[16]);
chars[7] = (char)(256 * buffer[19] + buffer[18]);
chars[8] = (char)(256 * buffer[21] + buffer[20]);
chars[9] = (char)(256 * buffer[23] + buffer[22]);
chars[10] = (char)(256 * buffer[25] + buffer[24]);
chars[11] = (char)(256 * buffer[29] + buffer[28]);
chars[12] = (char)(256 * buffer[31] + buffer[30]);
string chunk = new string(chars);
int zero = chunk.IndexOf('\0');
return zero >= 0 ? chunk.Substring(0, zero) : chunk;
}
private void LoadEntries()
{
_entries = new Dictionary<long, DirectoryEntry>();
_freeEntries = new List<long>();
_selfEntryLocation = -1;
_parentEntryLocation = -1;
string lfn = null; //+++
while (_dirStream.Position < _dirStream.Length)
{
long streamPos = _dirStream.Position;
DirectoryEntry entry = new DirectoryEntry(_fileSystem.FatOptions, _dirStream);
if (entry.Attributes == (FatAttributes.ReadOnly | FatAttributes.Hidden | FatAttributes.System | FatAttributes.VolumeId))
{
// Long File Name entry
_dirStream.Position = streamPos; //+++
lfn = GetLfnChunk(Utilities.ReadFully(_dirStream, 32)) + lfn; //+++
}
else if (entry.Name.IsDeleted())
{
// E5 = Free Entry
_freeEntries.Add(streamPos);
lfn = null; //+++
}
else if (entry.Name == FileName.SelfEntryName)
{
_selfEntry = entry;
_selfEntryLocation = streamPos;
lfn = null; //+++
}
else if (entry.Name == FileName.ParentEntryName)
{
_parentEntry = entry;
_parentEntryLocation = streamPos;
lfn = null; //+++
}
else if (entry.Name == FileName.Null)
{
// Free Entry, no more entries available
_endOfEntries = streamPos;
lfn = null; //+++
break;
}
else
{
if (lfn != null) //+++
{ //+++
_lfns.Add(entry.Name.GetDisplayName(_fileSystem.FatOptions.FileNameEncoding), lfn); //+++
} //+++
_entries.Add(streamPos, entry);
lfn = null; //+++
}
}
}
Second, add these two public functions to the Fat\\FatFileSystem.cs
file. They will be the new APIs to query on LFNs:
/// <summary>
/// Gets the long name of a given file.
/// </summary>
/// <param name="shortFullPath">The short full path to the file. Input path segments must be short names.</param>
/// <returns>The corresponding long file name.</returns>
public string GetLongFileName(string shortFullPath)
{
if (shortFullPath == null)
throw new ArgumentNullException("shortFullPath");
string dirPath = Path.GetDirectoryName(shortFullPath);
string fileName = Path.GetFileName(shortFullPath);
Directory dir = GetDirectory(dirPath);
if (dir == null)
return fileName;
string lfn;
if (dir._lfns.TryGetValue(Path.GetFileName(shortFullPath), out lfn))
return lfn;
return fileName;
}
/// <summary>
/// Gets the long path to a given file.
/// </summary>
/// <param name="shortFullPath">The short full path to the file. Input path segments must be short names.</param>
/// <returns>The corresponding long file path to the file or null if not found.</returns>
public string GetLongFilePath(string shortFullPath)
{
if (shortFullPath == null)
throw new ArgumentNullException("shortFullPath");
string path = null;
string current = null;
foreach (string segment in shortFullPath.Split(Path.DirectorySeparatorChar))
{
if (current == null)
{
current = segment;
path = GetLongFileName(current);
}
else
{
current = Path.Combine(current, segment);
path = Path.Combine(path, GetLongFileName(current));
}
}
return path;
}
And that's it. Now, youll be able to dump a whole FAT disk recursively like this, for example:
static void Main(string[] args)
{
using (FileStream fs = File.Open("fat.ima", FileMode.Open))
{
using (FatFileSystem floppy = new FatFileSystem(fs))
{
Dump(floppy.Root);
}
}
}
static void Dump(DiscDirectoryInfo di)
{
foreach (DiscDirectoryInfo subdi in di.GetDirectories())
{
Dump(subdi);
}
foreach (DiscFileInfo fi in di.GetFiles())
{
Console.WriteLine(fi.FullName);
// get LFN name
Console.WriteLine(" " + ((FatFileSystem)di.FileSystem).GetLongFileName(fi.FullName));
// get LFN-ed full path
Console.WriteLine(" " + ((FatFileSystem)di.FileSystem).GetLongFilePath(fi.FullName));
}
}
Use at your own risks! :)
7-Zip can extract FAT images. There is a C# wrapper library at http://sevenzipsharp.codeplex.com that can read filenames and extract to streams.
It would seem that there is no Long Name file support for FAT in DiscUtils. Check out this post. Which I am sure you are aware of, since it looks like you asked the question.
The best method with the command line is to use this:
7z "e " + source + " -o" + path + " * -r"
In C#, you can use this method I made (I copied 7z.exe to the Debug folder of my application)
public void ExtractDiskImage(string pathToDiskImage, string extractPath, bool WaitForFinish)
{
ProcessStartInfo UnzipDiskImage = new ProcessStartInfo("7z.exe");
StringBuilder str = new StringBuilder();
str.Append("e ");
str.Append(pathToDiskImage);
str.Append(" -o");
str.Append(extractPath);
str.Append(" * -r");
UnzipDiskImage.Arguments = str.ToString();
UnzipDiskImage.WindowStyle = ProcessWindowStyle.Hidden;
Process process = Process.Start(UnzipDiskImage);
if(WaitForFinish == true)
{
process.WaitForExit(); //My app had to wait for the extract to finish
}
}
DOS DIR command with the /X switch displays both long and short names.
Otherwise there is a utility to save LFNs: DOSLFNBk.exe that would help with creating a mapping table.
I know not the answers you were looking for but short of manually creating a table first so you can do the mapping without DiskUtil, I can't think of a utility or method to accomplish your aim - but as you mention, here at SO someone might know an alternative.
Kevin from DiskUtils did mention that he would be infringing on a Mirosoft Patent if he included support for LFN's, I am not suggesting you infringe either (DEFINITELY NOT its a commerial project) but if this is just personal or if you can find a library like 7-Zip has the license...
Your screenshot shows VNext.. same error with RTM versions?
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.