207 lines
8.0 KiB
C#
207 lines
8.0 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.IO;
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using DiscUtils.Streams;
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using DiscUtils.Vfs;
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namespace DiscUtils.Iso9660
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{
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/// <summary>
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/// Class for reading existing ISO images.
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/// </summary>
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public class CDReader : VfsFileSystemFacade, IClusterBasedFileSystem, IUnixFileSystem
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{
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/// <summary>
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/// Initializes a new instance of the CDReader class.
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/// </summary>
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/// <param name="data">The stream to read the ISO image from.</param>
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/// <param name="joliet">Whether to read Joliet extensions.</param>
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public CDReader(Stream data, bool joliet)
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: base(new VfsCDReader(data, joliet, false)) {}
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/// <summary>
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/// Initializes a new instance of the CDReader class.
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/// </summary>
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/// <param name="data">The stream to read the ISO image from.</param>
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/// <param name="joliet">Whether to read Joliet extensions.</param>
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/// <param name="hideVersions">Hides version numbers (e.g. ";1") from the end of files.</param>
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public CDReader(Stream data, bool joliet, bool hideVersions)
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: base(new VfsCDReader(data, joliet, hideVersions)) {}
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/// <summary>
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/// Gets which of the Iso9660 variants is being used.
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/// </summary>
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public Iso9660Variant ActiveVariant
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{
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get { return GetRealFileSystem<VfsCDReader>().ActiveVariant; }
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}
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/// <summary>
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/// Gets the emulation requested of BIOS when the image is loaded.
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/// </summary>
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public BootDeviceEmulation BootEmulation
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{
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get { return GetRealFileSystem<VfsCDReader>().BootEmulation; }
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}
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/// <summary>
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/// Gets the absolute start position (in bytes) of the boot image, or zero if not found.
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/// </summary>
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public long BootImageStart
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{
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get { return GetRealFileSystem<VfsCDReader>().BootImageStart; }
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}
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/// <summary>
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/// Gets the memory segment the image should be loaded into (0 for default).
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/// </summary>
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public int BootLoadSegment
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{
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get { return GetRealFileSystem<VfsCDReader>().BootLoadSegment; }
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}
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/// <summary>
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/// Gets a value indicating whether a boot image is present.
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/// </summary>
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public bool HasBootImage
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{
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get { return GetRealFileSystem<VfsCDReader>().HasBootImage; }
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}
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/// <summary>
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/// Gets the size (in bytes) of each cluster.
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/// </summary>
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public long ClusterSize
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{
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get { return GetRealFileSystem<VfsCDReader>().ClusterSize; }
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}
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/// <summary>
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/// Gets the total number of clusters managed by the file system.
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/// </summary>
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public long TotalClusters
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{
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get { return GetRealFileSystem<VfsCDReader>().TotalClusters; }
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}
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/// <summary>
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/// Converts a cluster (index) into an absolute byte position in the underlying stream.
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/// </summary>
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/// <param name="cluster">The cluster to convert.</param>
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/// <returns>The corresponding absolute byte position.</returns>
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public long ClusterToOffset(long cluster)
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{
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return GetRealFileSystem<VfsCDReader>().ClusterToOffset(cluster);
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}
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/// <summary>
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/// Converts an absolute byte position in the underlying stream to a cluster (index).
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/// </summary>
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/// <param name="offset">The byte position to convert.</param>
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/// <returns>The cluster containing the specified byte.</returns>
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public long OffsetToCluster(long offset)
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{
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return GetRealFileSystem<VfsCDReader>().OffsetToCluster(offset);
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}
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/// <summary>
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/// Converts a file name to the list of clusters occupied by the file's data.
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/// </summary>
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/// <param name="path">The path to inspect.</param>
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/// <returns>The clusters.</returns>
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/// <remarks>Note that in some file systems, small files may not have dedicated
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/// clusters. Only dedicated clusters will be returned.</remarks>
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public Range<long, long>[] PathToClusters(string path)
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{
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return GetRealFileSystem<VfsCDReader>().PathToClusters(path);
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}
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/// <summary>
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/// Converts a file name to the extents containing its data.
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/// </summary>
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/// <param name="path">The path to inspect.</param>
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/// <returns>The file extents, as absolute byte positions in the underlying stream.</returns>
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/// <remarks>Use this method with caution - not all file systems will store all bytes
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/// directly in extents. Files may be compressed, sparse or encrypted. This method
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/// merely indicates where file data is stored, not what's stored.</remarks>
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public StreamExtent[] PathToExtents(string path)
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{
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return GetRealFileSystem<VfsCDReader>().PathToExtents(path);
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}
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/// <summary>
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/// Gets an object that can convert between clusters and files.
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/// </summary>
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/// <returns>The cluster map.</returns>
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public ClusterMap BuildClusterMap()
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{
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return GetRealFileSystem<VfsCDReader>().BuildClusterMap();
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}
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/// <summary>
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/// Retrieves Unix-specific information about a file or directory.
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/// </summary>
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/// <param name="path">Path to the file or directory.</param>
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/// <returns>Information about the owner, group, permissions and type of the
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/// file or directory.</returns>
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public UnixFileSystemInfo GetUnixFileInfo(string path)
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{
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return GetRealFileSystem<VfsCDReader>().GetUnixFileInfo(path);
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}
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/// <summary>
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/// Detects if a stream contains a valid ISO file system.
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/// </summary>
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/// <param name="data">The stream to inspect.</param>
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/// <returns><c>true</c> if the stream contains an ISO file system, else false.</returns>
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public static bool Detect(Stream data)
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{
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byte[] buffer = new byte[IsoUtilities.SectorSize];
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if (data.Length < 0x8000 + IsoUtilities.SectorSize)
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{
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return false;
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}
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data.Position = 0x8000;
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int numRead = StreamUtilities.ReadMaximum(data, buffer, 0, IsoUtilities.SectorSize);
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if (numRead != IsoUtilities.SectorSize)
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{
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return false;
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}
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BaseVolumeDescriptor bvd = new BaseVolumeDescriptor(buffer, 0);
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return bvd.StandardIdentifier == BaseVolumeDescriptor.Iso9660StandardIdentifier;
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}
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/// <summary>
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/// Opens a stream containing the boot image.
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/// </summary>
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/// <returns>The boot image as a stream.</returns>
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public Stream OpenBootImage()
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{
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return GetRealFileSystem<VfsCDReader>().OpenBootImage();
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}
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}
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} |