75 lines
3.0 KiB
C#
75 lines
3.0 KiB
C#
//
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// Copyright (c) 2008-2011, Kenneth Bell
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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using System.Collections.Generic;
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namespace DiscUtils
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{
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/// <summary>
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/// Class that identifies the role of each cluster in a file system.
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/// </summary>
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public sealed class ClusterMap
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{
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private readonly object[] _clusterToFileId;
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private readonly ClusterRoles[] _clusterToRole;
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private readonly Dictionary<object, string[]> _fileIdToPaths;
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public ClusterMap(ClusterRoles[] clusterToRole, object[] clusterToFileId,
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Dictionary<object, string[]> fileIdToPaths)
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{
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_clusterToRole = clusterToRole;
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_clusterToFileId = clusterToFileId;
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_fileIdToPaths = fileIdToPaths;
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}
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/// <summary>
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/// Gets the role of a cluster within the file system.
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/// </summary>
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/// <param name="cluster">The cluster to inspect.</param>
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/// <returns>The clusters role (or roles).</returns>
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public ClusterRoles GetRole(long cluster)
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{
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if (_clusterToRole == null || _clusterToRole.Length < cluster)
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{
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return ClusterRoles.None;
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}
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return _clusterToRole[cluster];
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}
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/// <summary>
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/// Converts a cluster to a list of file names.
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/// </summary>
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/// <param name="cluster">The cluster to inspect.</param>
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/// <returns>A list of paths that map to the cluster.</returns>
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/// <remarks>A list is returned because on file systems with the notion of
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/// hard links, a cluster may correspond to multiple directory entries.</remarks>
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public string[] ClusterToPaths(long cluster)
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{
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if ((GetRole(cluster) & (ClusterRoles.DataFile | ClusterRoles.SystemFile)) != 0)
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{
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object fileId = _clusterToFileId[cluster];
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return _fileIdToPaths[fileId];
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}
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return new string[0];
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}
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}
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} |