root / trunk / hammock / src / net35 / ICSharpCode.SharpZipLib.Silverlight / Zip / ZipInputStream.cs @ 0eea575a
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// ZipInputStream.cs |
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// |
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// Copyright (C) 2001 Mike Krueger |
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// Copyright (C) 2004 John Reilly |
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// |
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// This file was translated from java, it was part of the GNU Classpath |
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// Copyright (C) 2001 Free Software Foundation, Inc. |
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// |
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// This program is free software; you can redistribute it and/or |
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// modify it under the terms of the GNU General Public License |
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// as published by the Free Software Foundation; either version 2 |
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// of the License, or (at your option) any later version. |
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// |
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// This program is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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// |
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// You should have received a copy of the GNU General Public License |
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// along with this program; if not, write to the Free Software |
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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// |
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// Linking this library statically or dynamically with other modules is |
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// making a combined work based on this library. Thus, the terms and |
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// conditions of the GNU General Public License cover the whole |
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// combination. |
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// |
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// As a special exception, the copyright holders of this library give you |
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// permission to link this library with independent modules to produce an |
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// executable, regardless of the license terms of these independent |
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// modules, and to copy and distribute the resulting executable under |
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// terms of your choice, provided that you also meet, for each linked |
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// independent module, the terms and conditions of the license of that |
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// module. An independent module is a module which is not derived from |
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// or based on this library. If you modify this library, you may extend |
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// this exception to your version of the library, but you are not |
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// obligated to do so. If you do not wish to do so, delete this |
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// exception statement from your version. |
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|
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using System; |
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using System.IO; |
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using ICSharpCode.SharpZipLib.Silverlight.Checksums; |
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using ICSharpCode.SharpZipLib.Silverlight.Encryption; |
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using ICSharpCode.SharpZipLib.Silverlight.Zip.Compression; |
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using ICSharpCode.SharpZipLib.Silverlight.Zip.Compression.Streams; |
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|
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namespace ICSharpCode.SharpZipLib.Silverlight.Zip |
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{ |
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/// <summary> |
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/// This is an InflaterInputStream that reads the files baseInputStream an zip archive |
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/// one after another. It has a special method to get the zip entry of |
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/// the next file. The zip entry contains information about the file name |
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/// size, compressed size, Crc, etc. |
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/// It includes support for Stored and Deflated entries. |
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/// <br/> |
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/// <br/>Author of the original java version : Jochen Hoenicke |
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/// </summary> |
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/// |
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/// <example> This sample shows how to read a zip file |
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/// <code lang="C#"> |
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/// using System; |
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/// using System.Text; |
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/// using System.IO; |
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/// |
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/// using ICSharpCode.SharpZipLib.Zip; |
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/// |
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/// class MainClass |
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/// { |
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/// public static void Main(string[] args) |
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/// { |
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/// using ( ZipInputStream s = new ZipInputStream(File.OpenRead(args[0]))) { |
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/// |
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/// ZipEntry theEntry; |
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/// while ((theEntry = s.GetNextEntry()) != null) { |
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/// int size = 2048; |
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/// byte[] data = new byte[2048]; |
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/// |
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/// Console.Write("Show contents (y/n) ?"); |
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/// if (Console.ReadLine() == "y") { |
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/// while (true) { |
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/// size = s.Read(data, 0, data.Length); |
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/// if (size > 0) { |
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/// Console.Write(new ASCIIEncoding().GetString(data, 0, size)); |
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/// } else { |
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/// break; |
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/// } |
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/// } |
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/// } |
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/// } |
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/// } |
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/// } |
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/// } |
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/// </code> |
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/// </example> |
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public class ZipInputStream : InflaterInputStream |
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{ |
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#region Instance Fields |
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|
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// Delegate for reading bytes from a stream. |
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|
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private Crc32 crc = new Crc32(); |
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private ZipEntry entry; |
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|
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private int flags; |
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|
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/// <summary> |
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/// The current reader this instance. |
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/// </summary> |
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private ReaderDelegate internalReader; |
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|
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private int method; |
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|
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private string password; |
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private long size; |
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|
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private delegate int ReaderDelegate(byte[] b, int offset, int length); |
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|
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#endregion |
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|
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#region Constructors |
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|
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/// <summary> |
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/// Creates a new Zip input stream, for reading a zip archive. |
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/// </summary> |
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/// <param name="baseInputStream">The underlying <see cref="Stream"/> providing data.</param> |
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public ZipInputStream(Stream baseInputStream) |
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: base(baseInputStream, new Inflater(true)) |
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{ |
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internalReader = ReadingNotAvailable; |
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} |
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|
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#endregion |
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|
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/// <summary> |
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/// Optional password used for encryption when non-null |
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/// </summary> |
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/// <value>A password for all encrypted <see cref="ZipEntry">entries </see> in this <see cref="ZipInputStream"/></value> |
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public string Password |
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{ |
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get { return password; } |
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set { password = value; } |
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} |
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|
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|
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/// <summary> |
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/// Gets a value indicating if there is a current entry and it can be decompressed |
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/// </summary> |
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/// <remarks> |
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/// The entry can only be decompressed if the library supports the zip features required to extract it. |
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/// See the <see cref="ZipEntry.Version">ZipEntry Version</see> property for more details. |
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/// </remarks> |
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public bool CanDecompressEntry |
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{ |
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get { return (entry != null) && entry.CanDecompress; } |
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} |
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|
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/// <summary> |
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/// Returns 1 if there is an entry available |
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/// Otherwise returns 0. |
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/// </summary> |
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public override int Available |
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{ |
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get { return entry != null ? 1 : 0; } |
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} |
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|
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/// <summary> |
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/// Returns the current size that can be read from the current entry if available |
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/// </summary> |
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/// <exception cref="ZipException">Thrown if the entry size is not known.</exception> |
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/// <exception cref="InvalidOperationException">Thrown if no entry is currently available.</exception> |
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public override long Length |
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{ |
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get |
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{ |
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if (entry != null) |
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{ |
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if (entry.Size >= 0) |
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{ |
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return entry.Size; |
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} |
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else |
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{ |
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throw new ZipException("Length not available for the current entry"); |
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} |
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} |
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else |
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{ |
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throw new InvalidOperationException("No current entry"); |
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} |
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} |
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} |
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|
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/// <summary> |
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/// Advances to the next entry in the archive |
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/// </summary> |
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/// <returns> |
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/// The next <see cref="ZipEntry">entry</see> in the archive or null if there are no more entries. |
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/// </returns> |
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/// <remarks> |
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/// If the previous entry is still open <see cref="CloseEntry">CloseEntry</see> is called. |
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/// </remarks> |
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/// <exception cref="InvalidOperationException"> |
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/// Input stream is closed |
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/// </exception> |
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/// <exception cref="ZipException"> |
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/// Password is not set, password is invalid, compression method is invalid, |
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/// version required to extract is not supported |
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/// </exception> |
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public ZipEntry GetNextEntry() |
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{ |
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if (crc == null) |
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{ |
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throw new InvalidOperationException("Closed."); |
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} |
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|
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if (entry != null) |
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{ |
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CloseEntry(); |
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} |
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|
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var header = inputBuffer.ReadLeInt(); |
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|
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if (header == ZipConstants.CentralHeaderSignature || |
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header == ZipConstants.EndOfCentralDirectorySignature || |
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header == ZipConstants.CentralHeaderDigitalSignature || |
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header == ZipConstants.ArchiveExtraDataSignature || |
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header == ZipConstants.Zip64CentralFileHeaderSignature) |
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{ |
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// No more individual entries exist |
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Close(); |
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return null; |
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} |
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|
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// -jr- 07-Dec-2003 Ignore spanning temporary signatures if found |
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// Spanning signature is same as descriptor signature and is untested as yet. |
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if ((header == ZipConstants.SpanningTempSignature) || (header == ZipConstants.SpanningSignature)) |
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{ |
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header = inputBuffer.ReadLeInt(); |
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} |
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|
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if (header != ZipConstants.LocalHeaderSignature) |
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{ |
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throw new ZipException("Wrong Local header signature: 0x" + String.Format("{0:X}", header)); |
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} |
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|
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var versionRequiredToExtract = (short) inputBuffer.ReadLeShort(); |
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|
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flags = inputBuffer.ReadLeShort(); |
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method = inputBuffer.ReadLeShort(); |
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var dostime = (uint) inputBuffer.ReadLeInt(); |
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var crc2 = inputBuffer.ReadLeInt(); |
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csize = inputBuffer.ReadLeInt(); |
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size = inputBuffer.ReadLeInt(); |
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var nameLen = inputBuffer.ReadLeShort(); |
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var extraLen = inputBuffer.ReadLeShort(); |
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|
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var isCrypted = (flags & 1) == 1; |
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|
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var buffer = new byte[nameLen]; |
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inputBuffer.ReadRawBuffer(buffer); |
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|
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var name = ZipConstants.ConvertToStringExt(flags, buffer); |
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|
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entry = new ZipEntry(name, versionRequiredToExtract); |
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entry.Flags = flags; |
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|
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entry.CompressionMethod = (CompressionMethod) method; |
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|
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if ((flags & 8) == 0) |
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{ |
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entry.Crc = crc2 & 0xFFFFFFFFL; |
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entry.Size = size & 0xFFFFFFFFL; |
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entry.CompressedSize = csize & 0xFFFFFFFFL; |
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|
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entry.CryptoCheckValue = (byte) ((crc2 >> 24) & 0xff); |
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} |
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else |
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{ |
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// This allows for GNU, WinZip and possibly other archives, the PKZIP spec |
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// says these values are zero under these circumstances. |
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if (crc2 != 0) |
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{ |
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entry.Crc = crc2 & 0xFFFFFFFFL; |
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} |
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|
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if (size != 0) |
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{ |
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entry.Size = size & 0xFFFFFFFFL; |
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} |
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|
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if (csize != 0) |
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{ |
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entry.CompressedSize = csize & 0xFFFFFFFFL; |
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} |
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|
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entry.CryptoCheckValue = (byte) ((dostime >> 8) & 0xff); |
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} |
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|
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entry.DosTime = dostime; |
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|
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// If local header requires Zip64 is true then the extended header should contain |
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// both values. |
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|
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// Handle extra data if present. This can set/alter some fields of the entry. |
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if (extraLen > 0) |
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{ |
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var extra = new byte[extraLen]; |
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inputBuffer.ReadRawBuffer(extra); |
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entry.ExtraData = extra; |
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} |
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|
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entry.ProcessExtraData(true); |
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if (entry.CompressedSize >= 0) |
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{ |
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csize = entry.CompressedSize; |
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} |
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|
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if (entry.Size >= 0) |
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{ |
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size = entry.Size; |
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} |
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|
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if (method == (int) CompressionMethod.Stored && |
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(!isCrypted && csize != size || (isCrypted && csize - ZipConstants.CryptoHeaderSize != size))) |
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{ |
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throw new ZipException("Stored, but compressed != uncompressed"); |
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} |
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|
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// Determine how to handle reading of data if this is attempted. |
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if (entry.IsCompressionMethodSupported()) |
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{ |
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internalReader = InitialRead; |
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} |
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else |
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{ |
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internalReader = ReadingNotSupported; |
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} |
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|
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return entry; |
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} |
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|
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/// <summary> |
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/// Read data descriptor at the end of compressed data. |
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/// </summary> |
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private void ReadDataDescriptor() |
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{ |
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if (inputBuffer.ReadLeInt() != ZipConstants.DataDescriptorSignature) |
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{ |
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throw new ZipException("Data descriptor signature not found"); |
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} |
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|
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entry.Crc = inputBuffer.ReadLeInt() & 0xFFFFFFFFL; |
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|
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if (entry.LocalHeaderRequiresZip64) |
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{ |
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csize = inputBuffer.ReadLeLong(); |
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size = inputBuffer.ReadLeLong(); |
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} |
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else |
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{ |
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csize = inputBuffer.ReadLeInt(); |
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size = inputBuffer.ReadLeInt(); |
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} |
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entry.CompressedSize = csize; |
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entry.Size = size; |
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} |
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|
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/// <summary> |
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/// Complete cleanup as the final part of closing. |
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/// </summary> |
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/// <param name="testCrc">True if the crc value should be tested</param> |
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private void CompleteCloseEntry(bool testCrc) |
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{ |
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StopDecrypting(); |
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|
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if ((flags & 8) != 0) |
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{ |
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ReadDataDescriptor(); |
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} |
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|
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size = 0; |
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|
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if (testCrc && |
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((crc.Value & 0xFFFFFFFFL) != entry.Crc) && (entry.Crc != -1)) |
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{ |
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throw new ZipException("CRC mismatch"); |
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} |
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|
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crc.Reset(); |
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|
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if (method == (int) CompressionMethod.Deflated) |
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{ |
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inf.Reset(); |
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} |
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entry = null; |
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} |
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|
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/// <summary> |
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/// Closes the current zip entry and moves to the next one. |
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/// </summary> |
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/// <exception cref="InvalidOperationException"> |
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/// The stream is closed |
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/// </exception> |
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/// <exception cref="ZipException"> |
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/// The Zip stream ends early |
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/// </exception> |
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public void CloseEntry() |
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{ |
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if (crc == null) |
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{ |
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throw new InvalidOperationException("Closed"); |
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} |
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|
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if (entry == null) |
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{ |
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return; |
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} |
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|
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if (method == (int) CompressionMethod.Deflated) |
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{ |
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if ((flags & 8) != 0) |
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{ |
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// We don't know how much we must skip, read until end. |
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var tmp = new byte[2048]; |
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|
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// Read will close this entry |
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while (Read(tmp, 0, tmp.Length) > 0) |
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{ |
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} |
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return; |
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} |
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|
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csize -= inf.TotalIn; |
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inputBuffer.Available += inf.RemainingInput; |
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} |
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|
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if ((inputBuffer.Available > csize) && (csize >= 0)) |
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{ |
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inputBuffer.Available = (int) (inputBuffer.Available - csize); |
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} |
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else |
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{ |
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csize -= inputBuffer.Available; |
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inputBuffer.Available = 0; |
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while (csize != 0) |
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{ |
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var skipped = (int) base.Skip(csize & 0xFFFFFFFFL); |
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|
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if (skipped <= 0) |
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{ |
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throw new ZipException("Zip archive ends early."); |
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} |
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|
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csize -= skipped; |
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} |
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} |
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|
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CompleteCloseEntry(false); |
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} |
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|
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/// <summary> |
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/// Reads a byte from the current zip entry. |
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/// </summary> |
464 |
/// <returns> |
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/// The byte or -1 if end of stream is reached. |
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/// </returns> |
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public override int ReadByte() |
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{ |
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var b = new byte[1]; |
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if (Read(b, 0, 1) <= 0) |
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{ |
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return -1; |
473 |
} |
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return b[0] & 0xff; |
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} |
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|
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/// <summary> |
478 |
/// Handle attempts to read by throwing an <see cref="InvalidOperationException"/>. |
479 |
/// </summary> |
480 |
/// <param name="destination">The destination array to store data in.</param> |
481 |
/// <param name="offset">The offset at which data read should be stored.</param> |
482 |
/// <param name="count">The maximum number of bytes to read.</param> |
483 |
/// <returns>Returns the number of bytes actually read.</returns> |
484 |
private int ReadingNotAvailable(byte[] destination, int offset, int count) |
485 |
{ |
486 |
throw new InvalidOperationException("Unable to read from this stream"); |
487 |
} |
488 |
|
489 |
/// <summary> |
490 |
/// Handle attempts to read from this entry by throwing an exception |
491 |
/// </summary> |
492 |
private int ReadingNotSupported(byte[] destination, int offset, int count) |
493 |
{ |
494 |
throw new ZipException("The compression method for this entry is not supported"); |
495 |
} |
496 |
|
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/// <summary> |
498 |
/// Perform the initial read on an entry which may include |
499 |
/// reading encryption headers and setting up inflation. |
500 |
/// </summary> |
501 |
/// <param name="destination">The destination to fill with data read.</param> |
502 |
/// <param name="offset">The offset to start reading at.</param> |
503 |
/// <param name="count">The maximum number of bytes to read.</param> |
504 |
/// <returns>The actual number of bytes read.</returns> |
505 |
private int InitialRead(byte[] destination, int offset, int count) |
506 |
{ |
507 |
if (!CanDecompressEntry) |
508 |
{ |
509 |
throw new ZipException("Library cannot extract this entry. Version required is (" + entry.Version + ")"); |
510 |
} |
511 |
|
512 |
// Handle encryption if required. |
513 |
if (entry.IsCrypted) |
514 |
{ |
515 |
if (password == null) |
516 |
{ |
517 |
throw new ZipException("No password set."); |
518 |
} |
519 |
|
520 |
// Generate and set crypto transform... |
521 |
var managed = new PkzipClassicManaged(); |
522 |
var key = PkzipClassic.GenerateKeys(ZipConstants.ConvertToArray(password)); |
523 |
|
524 |
inputBuffer.CryptoTransform = managed.CreateDecryptor(key, null); |
525 |
|
526 |
var cryptbuffer = new byte[ZipConstants.CryptoHeaderSize]; |
527 |
inputBuffer.ReadClearTextBuffer(cryptbuffer, 0, ZipConstants.CryptoHeaderSize); |
528 |
|
529 |
if (cryptbuffer[ZipConstants.CryptoHeaderSize - 1] != entry.CryptoCheckValue) |
530 |
{ |
531 |
throw new ZipException("Invalid password"); |
532 |
} |
533 |
|
534 |
if (csize >= ZipConstants.CryptoHeaderSize) |
535 |
{ |
536 |
csize -= ZipConstants.CryptoHeaderSize; |
537 |
} |
538 |
else if ((entry.Flags & (int) GeneralBitFlags.Descriptor) == 0) |
539 |
{ |
540 |
throw new ZipException(string.Format("Entry compressed size {0} too small for encryption", csize)); |
541 |
} |
542 |
} |
543 |
else |
544 |
{ |
545 |
inputBuffer.CryptoTransform = null; |
546 |
} |
547 |
|
548 |
if ((method == (int) CompressionMethod.Deflated) && (inputBuffer.Available > 0)) |
549 |
{ |
550 |
inputBuffer.SetInflaterInput(inf); |
551 |
} |
552 |
|
553 |
internalReader = BodyRead; |
554 |
return BodyRead(destination, offset, count); |
555 |
} |
556 |
|
557 |
/// <summary> |
558 |
/// Read a block of bytes from the stream. |
559 |
/// </summary> |
560 |
/// <param name="buffer">The destination for the bytes.</param> |
561 |
/// <param name="offset">The index to start storing data.</param> |
562 |
/// <param name="count">The number of bytes to attempt to read.</param> |
563 |
/// <returns>Returns the number of bytes read.</returns> |
564 |
/// <remarks>Zero bytes read means end of stream.</remarks> |
565 |
public override int Read(byte[] buffer, int offset, int count) |
566 |
{ |
567 |
if (buffer == null) |
568 |
{ |
569 |
throw new ArgumentNullException("buffer"); |
570 |
} |
571 |
|
572 |
if (offset < 0) |
573 |
{ |
574 |
throw new ArgumentOutOfRangeException("offset", "Cannot be negative"); |
575 |
} |
576 |
|
577 |
if (count < 0) |
578 |
{ |
579 |
throw new ArgumentOutOfRangeException("count", "Cannot be negative"); |
580 |
} |
581 |
|
582 |
if ((buffer.Length - offset) < count) |
583 |
{ |
584 |
throw new ArgumentException("Invalid offset/count combination"); |
585 |
} |
586 |
|
587 |
return internalReader(buffer, offset, count); |
588 |
} |
589 |
|
590 |
/// <summary> |
591 |
/// Reads a block of bytes from the current zip entry. |
592 |
/// </summary> |
593 |
/// <returns> |
594 |
/// The number of bytes read (this may be less than the length requested, even before the end of stream), or 0 on end of stream. |
595 |
/// </returns> |
596 |
/// <exception name="IOException"> |
597 |
/// An i/o error occured. |
598 |
/// </exception> |
599 |
/// <exception cref="ZipException"> |
600 |
/// The deflated stream is corrupted. |
601 |
/// </exception> |
602 |
/// <exception cref="InvalidOperationException"> |
603 |
/// The stream is not open. |
604 |
/// </exception> |
605 |
private int BodyRead(byte[] buffer, int offset, int count) |
606 |
{ |
607 |
if (crc == null) |
608 |
{ |
609 |
throw new InvalidOperationException("Closed"); |
610 |
} |
611 |
|
612 |
if ((entry == null) || (count <= 0)) |
613 |
{ |
614 |
return 0; |
615 |
} |
616 |
|
617 |
if (offset + count > buffer.Length) |
618 |
{ |
619 |
throw new ArgumentException("Offset + count exceeds buffer size"); |
620 |
} |
621 |
|
622 |
var finished = false; |
623 |
|
624 |
switch (method) |
625 |
{ |
626 |
case (int) CompressionMethod.Deflated: |
627 |
count = base.Read(buffer, offset, count); |
628 |
if (count <= 0) |
629 |
{ |
630 |
if (!inf.IsFinished) |
631 |
{ |
632 |
throw new ZipException("Inflater not finished!"); |
633 |
} |
634 |
inputBuffer.Available = inf.RemainingInput; |
635 |
|
636 |
if ((flags & 8) == 0 && (inf.TotalIn != csize || inf.TotalOut != size)) |
637 |
{ |
638 |
throw new ZipException("Size mismatch: " + csize + ";" + size + " <-> " + inf.TotalIn + ";" + |
639 |
inf.TotalOut); |
640 |
} |
641 |
inf.Reset(); |
642 |
finished = true; |
643 |
} |
644 |
break; |
645 |
|
646 |
case (int) CompressionMethod.Stored: |
647 |
if ((count > csize) && (csize >= 0)) |
648 |
{ |
649 |
count = (int) csize; |
650 |
} |
651 |
|
652 |
if (count > 0) |
653 |
{ |
654 |
count = inputBuffer.ReadClearTextBuffer(buffer, offset, count); |
655 |
if (count > 0) |
656 |
{ |
657 |
csize -= count; |
658 |
size -= count; |
659 |
} |
660 |
} |
661 |
|
662 |
if (csize == 0) |
663 |
{ |
664 |
finished = true; |
665 |
} |
666 |
else |
667 |
{ |
668 |
if (count < 0) |
669 |
{ |
670 |
throw new ZipException("EOF in stored block"); |
671 |
} |
672 |
} |
673 |
break; |
674 |
} |
675 |
|
676 |
if (count > 0) |
677 |
{ |
678 |
crc.Update(buffer, offset, count); |
679 |
} |
680 |
|
681 |
if (finished) |
682 |
{ |
683 |
CompleteCloseEntry(true); |
684 |
} |
685 |
|
686 |
return count; |
687 |
} |
688 |
|
689 |
/// <summary> |
690 |
/// Closes the zip input stream |
691 |
/// </summary> |
692 |
public override void Close() |
693 |
{ |
694 |
internalReader = ReadingNotAvailable; |
695 |
crc = null; |
696 |
entry = null; |
697 |
|
698 |
base.Close(); |
699 |
} |
700 |
} |
701 |
} |