public CompressedClusterStream(INtfsContext context, NtfsAttribute attr, RawClusterStream rawStream)
{
_context = context;
_attr = attr;
_rawStream = rawStream;
_bytesPerCluster = _context.BiosParameterBlock.BytesPerCluster;
_cacheBuffer = new byte[_attr.CompressionUnitSize * context.BiosParameterBlock.BytesPerCluster];
_ioBuffer = new byte[_attr.CompressionUnitSize * context.BiosParameterBlock.BytesPerCluster];
}
public NonResidentAttributeBuffer(File file, NtfsAttribute attribute)
: base(file.Context, CookRuns(attribute), file.IndexInMft == MasterFileTable.MftIndex)
{
_file = file;
_attribute = attribute;
switch (attribute.Flags & (AttributeFlags.Compressed | AttributeFlags.Sparse))
{
case AttributeFlags.Sparse:
_activeStream = new SparseClusterStream(_attribute, _rawStream);
break;
case AttributeFlags.Compressed:
_activeStream = new CompressedClusterStream(_context, _attribute, _rawStream);
break;
case AttributeFlags.None:
_activeStream = _rawStream;
break;
default:
throw new NotImplementedException("Unhandled attribute type '" + attribute.Flags + "'");
}
}
public SparseClusterStream(NtfsAttribute attr, RawClusterStream rawStream)
{
_attr = attr;
_rawStream = rawStream;
}
private static CookedDataRuns CookRuns(NtfsAttribute attribute)
{
CookedDataRuns result = new CookedDataRuns();
foreach (NonResidentAttributeRecord record in attribute.Records)
{
if (record.StartVcn != result.NextVirtualCluster)
{
throw new IOException("Invalid NTFS attribute - non-contiguous data runs");
}
result.Append(record.DataRuns, record);
}
return result;
}
internal void RemoveAttributeExtents(NtfsAttribute attr)
{
attr.GetDataBuffer().SetCapacity(0);
foreach (var extentRef in attr.Extents.Keys)
{
RemoveAttributeExtent(extentRef);
}
}
public FileStream(File file, NtfsAttribute attr, FileAccess access)
{
_file = file;
_attr = attr;
_wrapped = attr.Open(access);
}
private void RemoveAttribute(NtfsAttribute attr)
{
if (attr != null)
{
if (attr.PrimaryRecord.AttributeType == AttributeType.IndexRoot)
{
_indexCache.Remove(attr.PrimaryRecord.Name);
}
RemoveAttributeExtents(attr);
_attributes.Remove(attr);
UpdateAttributeList();
}
}
public NtfsAttributeBuffer(File file, NtfsAttribute attribute)
{
_file = file;
_attribute = attribute;
}