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* TODO:
* README.md: * DiscImageChef.sln: * DiscImageChef/Commands/Ls.cs: * DiscImageChef.Filters/GZip.cs: * DiscImageChef.DiscImages/BLU.cs: * DiscImageChef.DiscImages/VHD.cs: * DiscImageChef.DiscImages/VDI.cs: * DiscImageChef.DiscImages/QED.cs: * DiscImageChef.DiscImages/DIM.cs: * DiscImageChef.DiscImages/GDI.cs: * DiscImageChef.Filters/Filter.cs: * DiscImageChef/Commands/Decode.cs: * DiscImageChef.DiscImages/QCOW.cs: * DiscImageChef.Filters/Filters.cs: * DiscImageChef/Core/Statistics.cs: * DiscImageChef.DiscImages/VHDX.cs: * DiscImageChef.DiscImages/Nero.cs: * DiscImageChef/Commands/Verify.cs: * DiscImageChef.DiscImages/UDIF.cs: * DiscImageChef/Commands/Compare.cs: * DiscImageChef/Commands/Analyze.cs: * DiscImageChef.DiscImages/QCOW2.cs: * DiscImageChef/Commands/Entropy.cs: * DiscImageChef/Commands/Formats.cs: * DiscImageChef/Commands/PrintHex.cs: * DiscImageChef.DiscImages/VMware.cs: * DiscImageChef.Settings/Settings.cs: * DiscImageChef/DetectImageFormat.cs: * DiscImageChef/DiscImageChef.csproj: * DiscImageChef.DiscImages/CDRDAO.cs: * DiscImageChef.DiscImages/CPCDSK.cs: * DiscImageChef/Commands/Checksum.cs: * DiscImageChef.DiscImages/CopyQM.cs: * DiscImageChef.DiscImages/CDRWin.cs: * DiscImageChef/Commands/Configure.cs: * DiscImageChef/Commands/DumpMedia.cs: * DiscImageChef/Commands/Statistics.cs: * DiscImageChef.Filters/ZZZNoFilter.cs: * DiscImageChef.DiscImages/TeleDisk.cs: * DiscImageChef.DiscImages/Apple2MG.cs: * DiscImageChef.Filters/OffsetStream.cs: * DiscImageChef.DiscImages/Parallels.cs: * DiscImageChef/Commands/ExtractFiles.cs: * DiscImageChef.DiscImages/DiskCopy42.cs: * DiscImageChef.DiscImages/Alcohol120.cs: * DiscImageChef.DiscImages/ZZZRawImage.cs: * DiscImageChef/Commands/CreateSidecar.cs: * DiscImageChef.DiscImages/ImagePlugin.cs: * DiscImageChef.DiscImages/BlindWrite5.cs: * DiscImageChef.DiscImages/BlindWrite4.cs: * DiscImageChef.Filters/ForcedSeekStream.cs: * DiscImageChef.Filters/Properties/AssemblyInfo.cs: * DiscImageChef.Filters/DiscImageChef.Filters.csproj: * DiscImageChef.DiscImages/DiscImageChef.DiscImages.csproj: Added filters. * DiscImageChef.Filesystems/CPM/Info.cs: Do not throw identification exceptions. * DiscImageChef/Plugins.cs: Sorted plugins lists.
This commit is contained in:
239
DiscImageChef.Filters/GZip.cs
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239
DiscImageChef.Filters/GZip.cs
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// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : GZip.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Filters.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Allow to open files that are compressed using gzip.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2016 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.IO;
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using System.IO.Compression;
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namespace DiscImageChef.Filters
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{
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public class GZip : Filter
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{
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Stream dataStream;
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string basePath;
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DateTime lastWriteTime;
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DateTime creationTime;
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bool opened;
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uint decompressedSize;
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public GZip()
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{
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Name = "GZip";
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UUID = new Guid("F4996661-4A29-42C9-A2C7-3904EF40F3B0");
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}
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public override void Close()
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{
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if(dataStream != null)
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dataStream.Close();
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dataStream = null;
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basePath = null;
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opened = false;
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}
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public override string GetBasePath()
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{
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return basePath;
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}
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public override Stream GetDataForkStream()
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{
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// Otherwise base stream is not at correct position and deflate throws errors
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dataStream.Seek(0, SeekOrigin.Begin);
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return new ForcedSeekStream<GZipStream>(decompressedSize, dataStream, CompressionMode.Decompress);
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}
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public override string GetPath()
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{
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return basePath;
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}
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public override Stream GetResourceForkStream()
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{
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return null;
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}
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public override bool HasResourceFork()
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{
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return false;
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}
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public override bool Identify(byte[] buffer)
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{
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return buffer[0] == 0x1F && buffer[1] == 0x8B && buffer[2] == 0x08;
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}
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public override bool Identify(Stream stream)
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{
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byte[] buffer = new byte[3];
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stream.Seek(0, SeekOrigin.Begin);
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stream.Read(buffer, 0, 3);
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stream.Seek(0, SeekOrigin.Begin);
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return buffer[0] == 0x1F && buffer[1] == 0x8B && buffer[2] == 0x08;
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}
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public override bool Identify(string path)
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{
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if(File.Exists(path))
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{
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FileStream stream = new FileStream(path, FileMode.Open, FileAccess.Read);
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byte[] buffer = new byte[3];
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stream.Seek(0, SeekOrigin.Begin);
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stream.Read(buffer, 0, 3);
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stream.Seek(0, SeekOrigin.Begin);
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return buffer[0] == 0x1F && buffer[1] == 0x8B && buffer[2] == 0x08;
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}
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return false;
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}
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public override void Open(byte[] buffer)
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{
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byte[] mtime_b = new byte[4];
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byte[] isize_b = new byte[4];
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uint mtime;
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uint isize;
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dataStream = new MemoryStream(buffer);
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basePath = null;
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dataStream.Seek(4, SeekOrigin.Begin);
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dataStream.Read(mtime_b, 0, 4);
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dataStream.Seek(-4, SeekOrigin.End);
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dataStream.Read(isize_b, 0, 4);
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dataStream.Seek(0, SeekOrigin.Begin);
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mtime = BitConverter.ToUInt32(mtime_b, 0);
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isize = BitConverter.ToUInt32(isize_b, 0);
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decompressedSize = isize;
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creationTime = DateHandlers.UNIXUnsignedToDateTime(mtime);
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lastWriteTime = creationTime;
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opened = true;
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}
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public override void Open(Stream stream)
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{
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byte[] mtime_b = new byte[4];
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byte[] isize_b = new byte[4];
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uint mtime;
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uint isize;
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dataStream = stream;
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basePath = null;
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dataStream.Seek(4, SeekOrigin.Begin);
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dataStream.Read(mtime_b, 0, 4);
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dataStream.Seek(-4, SeekOrigin.End);
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dataStream.Read(isize_b, 0, 4);
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dataStream.Seek(0, SeekOrigin.Begin);
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mtime = BitConverter.ToUInt32(mtime_b, 0);
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isize = BitConverter.ToUInt32(isize_b, 0);
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decompressedSize = isize;
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creationTime = DateHandlers.UNIXUnsignedToDateTime(mtime);
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lastWriteTime = creationTime;
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opened = true;
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}
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public override void Open(string path)
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{
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byte[] mtime_b = new byte[4];
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byte[] isize_b = new byte[4];
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uint mtime;
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uint isize;
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dataStream = new FileStream(path, FileMode.Open, FileAccess.Read);
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basePath = Path.GetFullPath(path);
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dataStream.Seek(4, SeekOrigin.Begin);
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dataStream.Read(mtime_b, 0, 4);
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dataStream.Seek(-4, SeekOrigin.End);
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dataStream.Read(isize_b, 0, 4);
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dataStream.Seek(0, SeekOrigin.Begin);
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mtime = BitConverter.ToUInt32(mtime_b, 0);
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isize = BitConverter.ToUInt32(isize_b, 0);
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decompressedSize = isize;
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FileInfo fi = new FileInfo(path);
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creationTime = fi.CreationTimeUtc;
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lastWriteTime = DateHandlers.UNIXUnsignedToDateTime(mtime);
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opened = true;
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}
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public override DateTime GetCreationTime()
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{
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return creationTime;
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}
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public override long GetDataForkLength()
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{
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return decompressedSize;
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}
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public override DateTime GetLastWriteTime()
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{
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return lastWriteTime;
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}
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public override long GetLength()
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{
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return decompressedSize;
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}
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public override long GetResourceForkLength()
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{
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return 0;
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}
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public override string GetFilename()
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{
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return basePath != null ? Path.GetFileName(basePath) : null;
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}
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public override string GetParentFolder()
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{
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return Path.GetDirectoryName(basePath);
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}
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public override bool IsOpened()
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{
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return opened;
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}
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}
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}
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