public virtual FileRecord CreateFile(MftSegmentReference parentDirectory, string fileName, bool isDirectory)
{
// Worst case scenrario: the MFT might be full and the parent directory index requires multiple splits
if (NumberOfFreeClusters < 24)
{
throw new DiskFullException();
}
FileRecord parentDirectoryRecord = GetFileRecord(parentDirectory);
IndexData parentDirectoryIndex = new IndexData(this, parentDirectoryRecord, AttributeType.FileName);
if (parentDirectoryIndex.ContainsFileName(fileName))
{
throw new AlreadyExistsException();
}
List <FileNameRecord> fileNameRecords = IndexHelper.GenerateFileNameRecords(parentDirectory, fileName, isDirectory, m_generateDosNames, parentDirectoryIndex);
FileRecord fileRecord = m_mft.CreateFile(fileNameRecords);
// Update parent directory index
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
parentDirectoryIndex.AddEntry(fileRecord.BaseSegmentReference, fileNameRecord.GetBytes());
}
return(fileRecord);
}
public virtual FileRecord CreateFile(MftSegmentReference parentDirectory, string fileName, bool isDirectory)
{
// Worst case scenrario: the MFT might be full and the parent directory index requires multiple splits
if (NumberOfFreeClusters < 24)
{
throw new DiskFullException();
}
FileRecord parentDirectoryRecord = GetFileRecord(parentDirectory);
m_mftLock.AcquireWriterLock(Timeout.Infinite);
IndexData parentDirectoryIndex = new IndexData(this, parentDirectoryRecord, AttributeType.FileName);
if (parentDirectoryIndex.ContainsFileName(fileName))
{
m_mftLock.ReleaseWriterLock();
throw new AlreadyExistsException();
}
List <FileNameRecord> fileNameRecords = IndexHelper.GenerateFileNameRecords(parentDirectory, fileName, isDirectory, m_generateDosNames, parentDirectoryIndex);
uint transactionID = m_logClient.AllocateTransactionID();
FileRecord fileRecord = m_mft.CreateFile(fileNameRecords, transactionID);
// Update parent directory index
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
parentDirectoryIndex.AddEntry(fileRecord.BaseSegmentReference, fileNameRecord.GetBytes());
}
m_logClient.WriteForgetTransactionRecord(transactionID);
m_logClient.WriteRestartRecord(this.MajorVersion, true);
m_mftLock.ReleaseWriterLock();
return(fileRecord);
}
public virtual void MoveFile(FileRecord fileRecord, MftSegmentReference newParentDirectory, string newFileName)
{
// Worst case scenrario: the new parent directory index requires multiple splits
if (NumberOfFreeClusters < 4)
{
throw new DiskFullException();
}
FileRecord oldParentDirectoryRecord = GetFileRecord(fileRecord.ParentDirectoryReference);
IndexData oldParentDirectoryIndex = new IndexData(this, oldParentDirectoryRecord, AttributeType.FileName);
IndexData newParentDirectoryIndex;
if (fileRecord.ParentDirectoryReference == newParentDirectory)
{
newParentDirectoryIndex = oldParentDirectoryIndex;
}
else
{
FileRecord newParentDirectoryRecord = GetFileRecord(newParentDirectory);
newParentDirectoryIndex = new IndexData(this, newParentDirectoryRecord, AttributeType.FileName);
if (newParentDirectoryIndex.ContainsFileName(newFileName))
{
throw new AlreadyExistsException();
}
}
List <FileNameRecord> fileNameRecords = fileRecord.FileNameRecords;
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
oldParentDirectoryIndex.RemoveEntry(fileNameRecord.GetBytes());
}
DateTime creationTime = fileRecord.FileNameRecord.CreationTime;
DateTime modificationTime = fileRecord.FileNameRecord.ModificationTime;
DateTime mftModificationTime = fileRecord.FileNameRecord.MftModificationTime;
DateTime lastAccessTime = fileRecord.FileNameRecord.LastAccessTime;
ulong allocatedLength = fileRecord.FileNameRecord.AllocatedLength;
ulong fileSize = fileRecord.FileNameRecord.FileSize;
FileAttributes fileAttributes = fileRecord.FileNameRecord.FileAttributes;
ushort packedEASize = fileRecord.FileNameRecord.PackedEASize;
fileNameRecords = IndexHelper.GenerateFileNameRecords(newParentDirectory, newFileName, fileRecord.IsDirectory, m_generateDosNames, newParentDirectoryIndex, creationTime, modificationTime, mftModificationTime, lastAccessTime, allocatedLength, fileSize, fileAttributes, packedEASize);
fileRecord.RemoveAttributeRecords(AttributeType.FileName, String.Empty);
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
FileNameAttributeRecord fileNameAttribute = (FileNameAttributeRecord)fileRecord.CreateAttributeRecord(AttributeType.FileName, String.Empty);
fileNameAttribute.IsIndexed = true;
fileNameAttribute.Record = fileNameRecord;
}
UpdateFileRecord(fileRecord);
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
newParentDirectoryIndex.AddEntry(fileRecord.BaseSegmentReference, fileNameRecord.GetBytes());
}
}
public static string GenerateDosName(IndexData parentDirectoryIndex, string fileName)
{
string nameWithoutExtension = Path.GetFileNameWithoutExtension(fileName);
string extension = Path.GetExtension(fileName);
nameWithoutExtension = ConvertToDosCharacters(nameWithoutExtension).ToUpper();
if (extension.Length > 0)
{
extension = "." + ConvertToDosCharacters(extension.Substring(1)).ToUpper();
}
if (nameWithoutExtension.Length > 8)
{
nameWithoutExtension = nameWithoutExtension.Substring(0, 6) + "~1";
}
if (extension.Length > 4)
{
extension = extension.Substring(0, 4);
}
int index = 1;
string shortNameWithoutExtension;
while (index <= 0xFFFFFF)
{
string suffix = "~" + index.ToString("X");
int nameCharsToKeep = Math.Min(nameWithoutExtension.Length, 8 - suffix.Length);
shortNameWithoutExtension = nameWithoutExtension.Substring(0, nameCharsToKeep) + suffix;
string dosFileName = shortNameWithoutExtension + extension;
if (!parentDirectoryIndex.ContainsFileName(dosFileName))
{
return(dosFileName);
}
index++;
}
// Extremely unlikely that we will ever get here
throw new NotSupportedException(String.Format("Could not find an available DOS name for '{0}'", fileName));
}
public virtual FileRecord CreateFile(MftSegmentReference parentDirectory, string fileName, bool isDirectory)
{
if (fileName.Length > FileNameRecord.MaxFileNameLength)
{
throw new InvalidNameException();
}
// Worst case scenrario: the MFT might be full and the parent directory index requires multiple splits.
// We assume IndexData.ExtendGranularity is bigger than or equal to the number of splits.
if (NumberOfFreeClusters < m_mft.NumberOfClustersRequiredToExtend + NumberOfClustersRequiredToExtendIndex)
{
throw new DiskFullException();
}
lock (m_mftLock)
{
FileRecord parentDirectoryRecord = GetFileRecord(parentDirectory);
IndexData parentDirectoryIndex = new IndexData(this, parentDirectoryRecord, AttributeType.FileName);
if (parentDirectoryIndex.ContainsFileName(fileName))
{
throw new AlreadyExistsException();
}
List <FileNameRecord> fileNameRecords = IndexHelper.GenerateFileNameRecords(parentDirectory, fileName, isDirectory, GenerateDosNames, parentDirectoryIndex);
uint transactionID = m_logClient.AllocateTransactionID();
FileRecord fileRecord = m_mft.CreateFile(fileNameRecords, transactionID);
// Update parent directory index
foreach (FileNameRecord fileNameRecord in fileNameRecords)
{
parentDirectoryIndex.AddEntry(fileRecord.BaseSegmentReference, fileNameRecord.GetBytes());
}
m_logClient.WriteForgetTransactionRecord(transactionID);
m_logClient.WriteRestartRecord(true);
return(fileRecord);
}
}
