Initial commit - WPinternals 2.6

DiscUtils/Ntfs/Internals/MasterFileTable.cs

@@ -0,0 +1,154 @@
+//
+// 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.Internals
+{
+    using System.Collections.Generic;
+    using InternalMasterFileTable = DiscUtils.Ntfs.MasterFileTable;
+
+    /// <summary>
+    /// Provides read-only access to the Master File Table of an NTFS file system.
+    /// </summary>
+    public sealed class MasterFileTable
+    {
+        /// <summary>
+        /// Index of the Master File Table itself.
+        /// </summary>
+        public const long MasterFileTableIndex = 0;
+
+        /// <summary>
+        /// Index of the Master File Table Mirror file.
+        /// </summary>
+        public const long MasterFileTableMirrorIndex = 1;
+
+        /// <summary>
+        /// Index of the Log file.
+        /// </summary>
+        public const long LogFileIndex = 2;
+
+        /// <summary>
+        /// Index of the Volume file.
+        /// </summary>
+        public const long VolumeIndex = 3;
+
+        /// <summary>
+        /// Index of the Attribute Definition file.
+        /// </summary>
+        public const long AttributeDefinitionIndex = 4;
+
+        /// <summary>
+        /// Index of the Root Directory.
+        /// </summary>
+        public const long RootDirectoryIndex = 5;
+
+        /// <summary>
+        /// Index of the Bitmap file.
+        /// </summary>
+        public const long BitmapIndex = 6;
+
+        /// <summary>
+        /// Index of the Boot sector(s).
+        /// </summary>
+        public const long BootIndex = 7;
+
+        /// <summary>
+        /// Index of the Bad Cluster file.
+        /// </summary>
+        public const long BadClusterIndex = 8;
+
+        /// <summary>
+        /// Index of the Security Descriptor file.
+        /// </summary>
+        public const long SecureIndex = 9;
+
+        /// <summary>
+        /// Index of the Uppercase mapping file.
+        /// </summary>
+        public const long UppercaseIndex = 10;
+
+        /// <summary>
+        /// Index of the Optional Extensions directory.
+        /// </summary>
+        public const long ExtendDirectoryIndex = 11;
+
+        /// <summary>
+        /// First index available for 'normal' files.
+        /// </summary>
+        private const uint FirstNormalFileIndex = 24;
+
+        private INtfsContext _context;
+        private InternalMasterFileTable _mft;
+
+        internal MasterFileTable(INtfsContext context, InternalMasterFileTable mft)
+        {
+            _context = context;
+            _mft = mft;
+        }
+
+        /// <summary>
+        /// Gets an entry by index.
+        /// </summary>
+        /// <param name="index">The index of the entry.</param>
+        /// <returns>The entry.</returns>
+        public MasterFileTableEntry this[long index]
+        {
+            get
+            {
+                FileRecord mftRecord = _mft.GetRecord(index, true, true);
+                if (mftRecord != null)
+                {
+                    return new MasterFileTableEntry(_context, mftRecord);
+                }
+                else
+                {
+                    return null;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Enumerates all entries.
+        /// </summary>
+        /// <param name="filter">Filter controlling which entries are returned.</param>
+        /// <returns>An enumeration of entries matching the filter.</returns>
+        public IEnumerable<MasterFileTableEntry> GetEntries(EntryStates filter)
+        {
+            foreach (var record in _mft.Records)
+            {
+                EntryStates state;
+                if ((record.Flags & FileRecordFlags.InUse) != 0)
+                {
+                    state = EntryStates.InUse;
+                }
+                else
+                {
+                    state = EntryStates.NotInUse;
+                }
+
+                if ((state & filter) != 0)
+                {
+                    yield return new MasterFileTableEntry(_context, record);
+                }
+            }
+        }
+    }
+}