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Initial commit - WPinternals 2.6

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Rene Lergner
2018-10-25 22:35:49 +02:00
commit 396ae57f05
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DiscUtils/Ntfs/NtfsAttribute.cs
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//
// Copyright (c) 2008-2011, Kenneth Bell
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
namespace DiscUtils.Ntfs
{
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
internal class NtfsAttribute : IDiagnosticTraceable
{
protected File _file;
protected FileRecordReference _containingFile;
protected AttributeRecord _primaryRecord;
protected Dictionary<AttributeReference, AttributeRecord> _extents;
private IBuffer _cachedRawBuffer;
protected NtfsAttribute(File file, FileRecordReference containingFile, AttributeRecord record)
{
_file = file;
_containingFile = containingFile;
_primaryRecord = record;
_extents = new Dictionary<AttributeReference, AttributeRecord>();
_extents.Add(new AttributeReference(containingFile, record.AttributeId), _primaryRecord);
}
public AttributeReference Reference
{
get
{
return new AttributeReference(_containingFile, _primaryRecord.AttributeId);
}
}
public AttributeType Type
{
get { return _primaryRecord.AttributeType; }
}
public string Name
{
get { return _primaryRecord.Name; }
}
public AttributeFlags Flags
{
get
{
return _primaryRecord.Flags;
}
set
{
_primaryRecord.Flags = value;
_cachedRawBuffer = null;
}
}
public ushort Id
{
get { return _primaryRecord.AttributeId; }
}
public long Length
{
get { return _primaryRecord.DataLength; }
}
public AttributeRecord PrimaryRecord
{
get
{
return _primaryRecord;
}
}
public int CompressionUnitSize
{
get
{
NonResidentAttributeRecord firstExtent = FirstExtent as NonResidentAttributeRecord;
if (firstExtent == null)
{
return 0;
}
else
{
return firstExtent.CompressionUnitSize;
}
}
set
{
NonResidentAttributeRecord firstExtent = FirstExtent as NonResidentAttributeRecord;
if (firstExtent != null)
{
firstExtent.CompressionUnitSize = value;
}
}
}
public long CompressedDataSize
{
get
{
NonResidentAttributeRecord firstExtent = FirstExtent as NonResidentAttributeRecord;
if (firstExtent == null)
{
return FirstExtent.AllocatedLength;
}
else
{
return firstExtent.CompressedDataSize;
}
}
set
{
NonResidentAttributeRecord firstExtent = FirstExtent as NonResidentAttributeRecord;
if (firstExtent != null)
{
firstExtent.CompressedDataSize = value;
}
}
}
public List<AttributeRecord> Records
{
get
{
List<AttributeRecord> records = new List<AttributeRecord>(_extents.Values);
records.Sort(AttributeRecord.CompareStartVcns);
return records;
}
}
public IBuffer RawBuffer
{
get
{
if (_cachedRawBuffer == null)
{
if (_primaryRecord.IsNonResident)
{
_cachedRawBuffer = new NonResidentAttributeBuffer(_file, this);
}
else
{
_cachedRawBuffer = ((ResidentAttributeRecord)_primaryRecord).DataBuffer;
}
}
return _cachedRawBuffer;
}
}
public IDictionary<AttributeReference, AttributeRecord> Extents
{
get { return _extents; }
}
public AttributeRecord LastExtent
{
get
{
AttributeRecord last = null;
if (_extents != null)
{
long lastVcn = 0;
foreach (var extent in _extents)
{
NonResidentAttributeRecord nonResident = extent.Value as NonResidentAttributeRecord;
if (nonResident == null)
{
// Resident attribute, so there can only be one...
return extent.Value;
}
if (nonResident.LastVcn >= lastVcn)
{
last = extent.Value;
lastVcn = nonResident.LastVcn;
}
}
}
return last;
}
}
public AttributeRecord FirstExtent
{
get
{
if (_extents != null)
{
foreach (var extent in _extents)
{
NonResidentAttributeRecord nonResident = extent.Value as NonResidentAttributeRecord;
if (nonResident == null)
{
// Resident attribute, so there can only be one...
return extent.Value;
}
else if (nonResident.StartVcn == 0)
{
return extent.Value;
}
}
}
throw new InvalidDataException("Attribute with no initial extent");
}
}
public bool IsNonResident
{
get { return _primaryRecord.IsNonResident; }
}
protected string AttributeTypeName
{
get
{
switch (_primaryRecord.AttributeType)
{
case AttributeType.StandardInformation:
return "STANDARD INFORMATION";
case AttributeType.FileName:
return "FILE NAME";
case AttributeType.SecurityDescriptor:
return "SECURITY DESCRIPTOR";
case AttributeType.Data:
return "DATA";
case AttributeType.Bitmap:
return "BITMAP";
case AttributeType.VolumeName:
return "VOLUME NAME";
case AttributeType.VolumeInformation:
return "VOLUME INFORMATION";
case AttributeType.IndexRoot:
return "INDEX ROOT";
case AttributeType.IndexAllocation:
return "INDEX ALLOCATION";
case AttributeType.ObjectId:
return "OBJECT ID";
case AttributeType.ReparsePoint:
return "REPARSE POINT";
case AttributeType.AttributeList:
return "ATTRIBUTE LIST";
default:
return "UNKNOWN";
}
}
}
public static NtfsAttribute FromRecord(File file, FileRecordReference recordFile, AttributeRecord record)
{
switch (record.AttributeType)
{
case AttributeType.StandardInformation:
return new StructuredNtfsAttribute<StandardInformation>(file, recordFile, record);
case AttributeType.FileName:
return new StructuredNtfsAttribute<FileNameRecord>(file, recordFile, record);
case AttributeType.SecurityDescriptor:
return new StructuredNtfsAttribute<SecurityDescriptor>(file, recordFile, record);
case AttributeType.Data:
return new NtfsAttribute(file, recordFile, record);
case AttributeType.Bitmap:
return new NtfsAttribute(file, recordFile, record);
case AttributeType.VolumeName:
return new StructuredNtfsAttribute<VolumeName>(file, recordFile, record);
case AttributeType.VolumeInformation:
return new StructuredNtfsAttribute<VolumeInformation>(file, recordFile, record);
case AttributeType.IndexRoot:
return new NtfsAttribute(file, recordFile, record);
case AttributeType.IndexAllocation:
return new NtfsAttribute(file, recordFile, record);
case AttributeType.ObjectId:
return new StructuredNtfsAttribute<ObjectId>(file, recordFile, record);
case AttributeType.ReparsePoint:
return new StructuredNtfsAttribute<ReparsePointRecord>(file, recordFile, record);
case AttributeType.AttributeList:
return new StructuredNtfsAttribute<AttributeList>(file, recordFile, record);
default:
return new NtfsAttribute(file, recordFile, record);
}
}
public void SetExtent(FileRecordReference containingFile, AttributeRecord record)
{
_cachedRawBuffer = null;
_containingFile = containingFile;
_primaryRecord = record;
_extents.Clear();
_extents.Add(new AttributeReference(containingFile, record.AttributeId), record);
}
public void AddExtent(FileRecordReference containingFile, AttributeRecord record)
{
_cachedRawBuffer = null;
_extents.Add(new AttributeReference(containingFile, record.AttributeId), record);
}
public void RemoveExtentCacheSafe(AttributeReference reference)
{
_extents.Remove(reference);
}
public bool ReplaceExtent(AttributeReference oldRef, AttributeReference newRef, AttributeRecord record)
{
_cachedRawBuffer = null;
if (!_extents.Remove(oldRef))
{
return false;
}
else
{
if (oldRef.Equals(Reference) || _extents.Count == 0)
{
_primaryRecord = record;
_containingFile = newRef.File;
}
_extents.Add(newRef, record);
return true;
}
}
public Range<long, long>[] GetClusters()
{
List<Range<long, long>> result = new List<Range<long, long>>();
foreach (var extent in _extents)
{
result.AddRange(extent.Value.GetClusters());
}
return result.ToArray();
}
public virtual void Dump(TextWriter writer, string indent)
{
writer.WriteLine(indent + AttributeTypeName + " ATTRIBUTE (" + (Name == null ? "No Name" : Name) + ")");
writer.WriteLine(indent + " Length: " + _primaryRecord.DataLength + " bytes");
if (_primaryRecord.DataLength == 0)
{
writer.WriteLine(indent + " Data: <none>");
}
else
{
try
{
using (Stream s = Open(FileAccess.Read))
{
string hex = string.Empty;
byte[] buffer = new byte[32];
int numBytes = s.Read(buffer, 0, buffer.Length);
for (int i = 0; i < numBytes; ++i)
{
hex = hex + string.Format(CultureInfo.InvariantCulture, " {0:X2}", buffer[i]);
}
writer.WriteLine(indent + " Data: " + hex + ((numBytes < s.Length) ? "..." : string.Empty));
}
}
catch
{
writer.WriteLine(indent + " Data: <can't read>");
}
}
_primaryRecord.Dump(writer, indent + " ");
}
internal SparseStream Open(FileAccess access)
{
return new BufferStream(GetDataBuffer(), access);
}
internal IMappedBuffer GetDataBuffer()
{
return new NtfsAttributeBuffer(_file, this);
}
internal long OffsetToAbsolutePos(long offset)
{
return GetDataBuffer().MapPosition(offset);
}
}
}