Initial commit - WPinternals 2.6

DiscUtils/Ntfs/FileRecordReference.cs

@@ -0,0 +1,123 @@
+//
+// 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;
+
+    internal struct FileRecordReference : IByteArraySerializable, IComparable<FileRecordReference>
+    {
+        private ulong _val;
+
+        public FileRecordReference(ulong val)
+        {
+            _val = val;
+        }
+
+        public FileRecordReference(long mftIndex, ushort sequenceNumber)
+        {
+            _val = (ulong)(mftIndex & 0x0000FFFFFFFFFFFFL) | ((ulong)((ulong)sequenceNumber << 48) & 0xFFFF000000000000L);
+        }
+
+        public ulong Value
+        {
+            get { return _val; }
+        }
+
+        public long MftIndex
+        {
+            get { return (long)(_val & 0x0000FFFFFFFFFFFFL); }
+        }
+
+        public ushort SequenceNumber
+        {
+            get { return (ushort)((_val >> 48) & 0xFFFF); }
+        }
+
+        public int Size
+        {
+            get { return 8; }
+        }
+
+        public bool IsNull
+        {
+            get { return SequenceNumber == 0; }
+        }
+
+        public static bool operator ==(FileRecordReference a, FileRecordReference b)
+        {
+            return a._val == b._val;
+        }
+
+        public static bool operator !=(FileRecordReference a, FileRecordReference b)
+        {
+            return a._val != b._val;
+        }
+
+        public int ReadFrom(byte[] buffer, int offset)
+        {
+            _val = Utilities.ToUInt64LittleEndian(buffer, offset);
+            return 8;
+        }
+
+        public void WriteTo(byte[] buffer, int offset)
+        {
+            Utilities.WriteBytesLittleEndian(_val, buffer, offset);
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj == null || !(obj is FileRecordReference))
+            {
+                return false;
+            }
+
+            return _val == ((FileRecordReference)obj)._val;
+        }
+
+        public override int GetHashCode()
+        {
+            return _val.GetHashCode();
+        }
+
+        public int CompareTo(FileRecordReference other)
+        {
+            if (_val < other._val)
+            {
+                return -1;
+            }
+            else if (_val > other._val)
+            {
+                return 1;
+            }
+            else
+            {
+                return 0;
+            }
+        }
+
+        public override string ToString()
+        {
+            return "MFT:" + MftIndex + " (ver: " + SequenceNumber + ")";
+        }
+    }
+}