public int GetNumberOfBytesFree(int bytesPerFileRecordSegment, ushort minorNTFSVersion)
{
int firstAttributeOffset = FileRecordSegment.GetFirstAttributeOffset(bytesPerFileRecordSegment, minorNTFSVersion);
int numberOfBytesAvailable = bytesPerFileRecordSegment - firstAttributeOffset - EndMarkerLength;
foreach (AttributeRecord attribute in m_immediateAttributes)
{
numberOfBytesAvailable -= attribute.RecordLength;
}
return(numberOfBytesAvailable);
}
public void UpdateSegments(int maximumSegmentLength, int bytesPerSector, ushort minorNTFSVersion)
{
foreach (FileRecordSegment segment in m_segments)
{
segment.ImmediateAttributes.Clear();
}
int segmentLength = FileRecordSegment.GetFirstAttributeOffset(maximumSegmentLength, minorNTFSVersion);
segmentLength += FileRecordSegment.EndMarkerLength;
foreach (AttributeRecord attribute in this.Attributes)
{
segmentLength += (int)attribute.RecordLength;
}
if (segmentLength <= maximumSegmentLength)
{
// a single record segment is needed
FileRecordSegment baseRecordSegment = m_segments[0];
foreach (AttributeRecord attribute in this.Attributes)
{
baseRecordSegment.ImmediateAttributes.Add(attribute);
}
// free the rest of the segments, if there are any
for (int index = 1; index < m_segments.Count; index++)
{
m_segments[index].IsInUse = false;
}
}
else
{
// we have to check if we can make some data streams non-resident,
// otherwise we have to use child segments and create an attribute list
throw new NotImplementedException();
}
}
/// <remarks>
/// https://blogs.technet.microsoft.com/askcore/2009/10/16/the-four-stages-of-ntfs-file-growth/
/// </remarks>
public void UpdateSegments(int bytesPerFileRecordSegment, ushort minorNTFSVersion)
{
List <AttributeRecord> attributes = this.Attributes;
foreach (FileRecordSegment segment in m_segments)
{
segment.ImmediateAttributes.Clear();
}
int segmentLength = FileRecordSegment.GetFirstAttributeOffset(bytesPerFileRecordSegment, minorNTFSVersion);
segmentLength += FileRecordSegment.EndMarkerLength;
foreach (AttributeRecord attribute in attributes)
{
segmentLength += (int)attribute.RecordLength;
}
if (segmentLength <= bytesPerFileRecordSegment)
{
// A single record segment is needed
foreach (AttributeRecord attribute in attributes)
{
m_segments[0].ImmediateAttributes.Add(attribute);
}
// free the rest of the segments, if there are any
for (int index = 1; index < m_segments.Count; index++)
{
m_segments[index].IsInUse = false;
}
}
else
{
// We slice the attributes and put them in segments, the attribute list will be built by the caller after the new segments will be allocated
FileRecordHelper.SliceAttributes(m_segments, attributes, bytesPerFileRecordSegment, minorNTFSVersion);
}
}
public static int GetNumberOfBytesAvailable(int bytesPerFileRecordSegment, ushort minorNTFSVersion)
{
int firstAttributeOffset = FileRecordSegment.GetFirstAttributeOffset(bytesPerFileRecordSegment, minorNTFSVersion);
return(bytesPerFileRecordSegment - firstAttributeOffset - AttributesEndMarkerLength);
}
