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AirScout/DotNetZip/Zip/ZipFile.cs

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C#
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// ZipFile.cs
//
// Copyright (c) 2006-2010 Dino Chiesa
// All rights reserved.
//
// This module is part of DotNetZip, a zipfile class library.
// The class library reads and writes zip files, according to the format
// described by PKware, at:
// http://www.pkware.com/business_and_developers/developer/popups/appnote.txt
//
//
// There are other Zip class libraries available.
//
// - it is possible to read and write zip files within .NET via the J# runtime.
// But some people don't like to install the extra DLL, which is no longer
// supported by MS. And also, the J# libraries don't support advanced zip
// features, like ZIP64, spanned archives, or AES encryption.
//
// - There are third-party GPL and LGPL libraries available. Some people don't
// like the license, and some of them don't support all the ZIP features, like AES.
//
// - Finally, there are commercial tools (From ComponentOne, XCeed, etc). But
// some people don't want to incur the cost.
//
// This alternative implementation is **not** GPL licensed. It is free of cost, and
// does not require J#. It does require .NET 2.0. It balances a good set of
// features, with ease of use and speed of performance.
//
// This code is released under the Microsoft Public License .
// See the License.txt for details.
//
//
// NB: This implementation originally relied on the
// System.IO.Compression.DeflateStream base class in the .NET Framework
// v2.0 base class library, but now includes a managed-code port of Zlib.
//
// Thu, 08 Oct 2009 17:04
//
using System;
using System.IO;
using System.Collections.Generic;
using Interop = System.Runtime.InteropServices;
namespace Ionic.Zip
{
/// <summary>
/// The ZipFile type represents a zip archive file.
/// </summary>
///
/// <remarks>
/// <para>
/// This is the main type in the DotNetZip class library. This class reads and
/// writes zip files, as defined in the <see
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">specification
/// for zip files described by PKWare</see>. The compression for this
/// implementation is provided by a managed-code version of Zlib, included with
/// DotNetZip in the classes in the Ionic.Zlib namespace.
/// </para>
///
/// <para>
/// This class provides a general purpose zip file capability. Use it to read,
/// create, or update zip files. When you want to create zip files using a
/// <c>Stream</c> type to write the zip file, you may want to consider the <see
/// cref="ZipOutputStream"/> class.
/// </para>
///
/// <para>
/// Both the <c>ZipOutputStream</c> class and the <c>ZipFile</c> class can
/// be used to create zip files. Both of them support many of the common zip
/// features, including Unicode, different compression methods and levels,
/// and ZIP64. They provide very similar performance when creating zip
/// files.
/// </para>
///
/// <para>
/// The <c>ZipFile</c> class is generally easier to use than
/// <c>ZipOutputStream</c> and should be considered a higher-level interface. For
/// example, when creating a zip file via calls to the <c>PutNextEntry()</c> and
/// <c>Write()</c> methods on the <c>ZipOutputStream</c> class, the caller is
/// responsible for opening the file, reading the bytes from the file, writing
/// those bytes into the <c>ZipOutputStream</c>, setting the attributes on the
/// <c>ZipEntry</c>, and setting the created, last modified, and last accessed
/// timestamps on the zip entry. All of these things are done automatically by a
/// call to <see cref="ZipFile.AddFile(string,string)">ZipFile.AddFile()</see>.
/// For this reason, the <c>ZipOutputStream</c> is generally recommended for use
/// only when your application emits arbitrary data, not necessarily data from a
/// filesystem file, directly into a zip file, and does so using a <c>Stream</c>
/// metaphor.
/// </para>
///
/// <para>
/// Aside from the differences in programming model, there are other
/// differences in capability between the two classes.
/// </para>
///
/// <list type="bullet">
/// <item>
/// <c>ZipFile</c> can be used to read and extract zip files, in addition to
/// creating zip files. <c>ZipOutputStream</c> cannot read zip files. If you want
/// to use a stream to read zip files, check out the <see cref="ZipInputStream"/> class.
/// </item>
///
/// <item>
/// <c>ZipOutputStream</c> does not support the creation of segmented or spanned
/// zip files.
/// </item>
///
/// <item>
/// <c>ZipOutputStream</c> cannot produce a self-extracting archive.
/// </item>
/// </list>
///
/// <para>
/// Be aware that the <c>ZipFile</c> class implements the <see
/// cref="System.IDisposable"/> interface. In order for <c>ZipFile</c> to
/// produce a valid zip file, you use use it within a using clause (<c>Using</c>
/// in VB), or call the <c>Dispose()</c> method explicitly. See the examples
/// for how to employ a using clause.
/// </para>
///
/// </remarks>
[Interop.GuidAttribute("ebc25cf6-9120-4283-b972-0e5520d00005")]
[Interop.ComVisible(true)]
#if !NETCF
[Interop.ClassInterface(Interop.ClassInterfaceType.AutoDispatch)]
#endif
public partial class ZipFile :
System.Collections.IEnumerable,
System.Collections.Generic.IEnumerable<ZipEntry>,
IDisposable
{
#region public properties
/// <summary>
/// Indicates whether to perform a full scan of the zip file when reading it.
/// </summary>
///
/// <remarks>
///
/// <para>
/// You almost never want to use this property.
/// </para>
///
/// <para>
/// When reading a zip file, if this flag is <c>true</c> (<c>True</c> in
/// VB), the entire zip archive will be scanned and searched for entries.
/// For large archives, this can take a very, long time. The much more
/// efficient default behavior is to read the zip directory, which is
/// stored at the end of the zip file. But, in some cases the directory is
/// corrupted and you need to perform a full scan of the zip file to
/// determine the contents of the zip file. This property lets you do
/// that, when necessary.
/// </para>
///
/// <para>
/// This flag is effective only when calling <see
/// cref="Initialize(string)"/>. Normally you would read a ZipFile with the
/// static <see cref="ZipFile.Read(String)">ZipFile.Read</see>
/// method. But you can't set the <c>FullScan</c> property on the
/// <c>ZipFile</c> instance when you use a static factory method like
/// <c>ZipFile.Read</c>.
/// </para>
///
/// </remarks>
///
/// <example>
///
/// This example shows how to read a zip file using the full scan approach,
/// and then save it, thereby producing a corrected zip file.
///
/// <code lang="C#">
/// using (var zip = new ZipFile())
/// {
/// zip.FullScan = true;
/// zip.Initialize(zipFileName);
/// zip.Save(newName);
/// }
/// </code>
///
/// <code lang="VB">
/// Using zip As New ZipFile
/// zip.FullScan = True
/// zip.Initialize(zipFileName)
/// zip.Save(newName)
/// End Using
/// </code>
/// </example>
///
public bool FullScan
{
get;
set;
}
/// <summary>
/// Whether to sort the ZipEntries before saving the file.
/// </summary>
///
/// <remarks>
/// The default is false. If you have a large number of zip entries, the sort
/// alone can consume significant time.
/// </remarks>
///
/// <example>
/// <code lang="C#">
/// using (var zip = new ZipFile())
/// {
/// zip.AddFiles(filesToAdd);
/// zip.SortEntriesBeforeSaving = true;
/// zip.Save(name);
/// }
/// </code>
///
/// <code lang="VB">
/// Using zip As New ZipFile
/// zip.AddFiles(filesToAdd)
/// zip.SortEntriesBeforeSaving = True
/// zip.Save(name)
/// End Using
/// </code>
/// </example>
///
public bool SortEntriesBeforeSaving
{
get;
set;
}
/// <summary>
/// Indicates whether NTFS Reparse Points, like junctions, should be
/// traversed during calls to <c>AddDirectory()</c>.
/// </summary>
///
/// <remarks>
/// By default, calls to AddDirectory() will traverse NTFS reparse
/// points, like mounted volumes, and directory junctions. An example
/// of a junction is the "My Music" directory in Windows Vista. In some
/// cases you may not want DotNetZip to traverse those directories. In
/// that case, set this property to false.
/// </remarks>
///
/// <example>
/// <code lang="C#">
/// using (var zip = new ZipFile())
/// {
/// zip.AddDirectoryWillTraverseReparsePoints = false;
/// zip.AddDirectory(dirToZip,"fodder");
/// zip.Save(zipFileToCreate);
/// }
/// </code>
/// </example>
public bool AddDirectoryWillTraverseReparsePoints { get; set; }
/// <summary>
/// Size of the IO buffer used while saving.
/// </summary>
///
/// <remarks>
///
/// <para>
/// First, let me say that you really don't need to bother with this. It is
/// here to allow for optimizations that you probably won't make! It will work
/// fine if you don't set or get this property at all. Ok?
/// </para>
///
/// <para>
/// Now that we have <em>that</em> out of the way, the fine print: This
/// property affects the size of the buffer that is used for I/O for each
/// entry contained in the zip file. When a file is read in to be compressed,
/// it uses a buffer given by the size here. When you update a zip file, the
/// data for unmodified entries is copied from the first zip file to the
/// other, through a buffer given by the size here.
/// </para>
///
/// <para>
/// Changing the buffer size affects a few things: first, for larger buffer
/// sizes, the memory used by the <c>ZipFile</c>, obviously, will be larger
/// during I/O operations. This may make operations faster for very much
/// larger files. Last, for any given entry, when you use a larger buffer
/// there will be fewer progress events during I/O operations, because there's
/// one progress event generated for each time the buffer is filled and then
/// emptied.
/// </para>
///
/// <para>
/// The default buffer size is 8k. Increasing the buffer size may speed
/// things up as you compress larger files. But there are no hard-and-fast
/// rules here, eh? You won't know til you test it. And there will be a
/// limit where ever larger buffers actually slow things down. So as I said
/// in the beginning, it's probably best if you don't set or get this property
/// at all.
/// </para>
///
/// </remarks>
///
/// <example>
/// This example shows how you might set a large buffer size for efficiency when
/// dealing with zip entries that are larger than 1gb.
/// <code lang="C#">
/// using (ZipFile zip = new ZipFile())
/// {
/// zip.SaveProgress += this.zip1_SaveProgress;
/// zip.AddDirectory(directoryToZip, "");
/// zip.UseZip64WhenSaving = Zip64Option.Always;
/// zip.BufferSize = 65536*8; // 65536 * 8 = 512k
/// zip.Save(ZipFileToCreate);
/// }
/// </code>
/// </example>
public int BufferSize
{
get { return _BufferSize; }
set { _BufferSize = value; }
}
/// <summary>
/// Size of the work buffer to use for the ZLIB codec during compression.
/// </summary>
///
/// <remarks>
/// <para>
/// When doing ZLIB or Deflate compression, the library fills a buffer,
/// then passes it to the compressor for compression. Then the library
/// reads out the compressed bytes. This happens repeatedly until there
/// is no more uncompressed data to compress. This property sets the
/// size of the buffer that will be used for chunk-wise compression. In
/// order for the setting to take effect, your application needs to set
/// this property before calling one of the <c>ZipFile.Save()</c>
/// overloads.
/// </para>
/// <para>
/// Setting this affects the performance and memory efficiency of
/// compression and decompression. For larger files, setting this to a
/// larger size may improve compression performance, but the exact
/// numbers vary depending on available memory, the size of the streams
/// you are compressing, and a bunch of other variables. I don't have
/// good firm recommendations on how to set it. You'll have to test it
/// yourself. Or just leave it alone and accept the default.
/// </para>
/// </remarks>
public int CodecBufferSize
{
get;
set;
}
/// <summary>
/// Indicates whether extracted files should keep their paths as
/// stored in the zip archive.
/// </summary>
///
/// <remarks>
/// <para>
/// This property affects Extraction. It is not used when creating zip
/// archives.
/// </para>
///
/// <para>
/// With this property set to <c>false</c>, the default, extracting entries
/// from a zip file will create files in the filesystem that have the full
/// path associated to the entry within the zip file. With this property set
/// to <c>true</c>, extracting entries from the zip file results in files
/// with no path: the folders are "flattened."
/// </para>
///
/// <para>
/// An example: suppose the zip file contains entries /directory1/file1.txt and
/// /directory2/file2.txt. With <c>FlattenFoldersOnExtract</c> set to false,
/// the files created will be \directory1\file1.txt and \directory2\file2.txt.
/// With the property set to true, the files created are file1.txt and file2.txt.
/// </para>
///
/// </remarks>
public bool FlattenFoldersOnExtract
{
get;
set;
}
/// <summary>
/// The compression strategy to use for all entries.
/// </summary>
///
/// <remarks>
/// Set the Strategy used by the ZLIB-compatible compressor, when
/// compressing entries using the DEFLATE method. Different compression
/// strategies work better on different sorts of data. The strategy
/// parameter can affect the compression ratio and the speed of
/// compression but not the correctness of the compresssion. For more
/// information see <see
/// cref="Ionic.Zlib.CompressionStrategy">Ionic.Zlib.CompressionStrategy</see>.
/// </remarks>
public Ionic.Zlib.CompressionStrategy Strategy
{
get { return _Strategy; }
set { _Strategy = value; }
}
/// <summary>
/// The name of the <c>ZipFile</c>, on disk.
/// </summary>
///
/// <remarks>
///
/// <para>
/// When the <c>ZipFile</c> instance was created by reading an archive using
/// one of the <c>ZipFile.Read</c> methods, this property represents the name
/// of the zip file that was read. When the <c>ZipFile</c> instance was
/// created by using the no-argument constructor, this value is <c>null</c>
/// (<c>Nothing</c> in VB).
/// </para>
///
/// <para>
/// If you use the no-argument constructor, and you then explicitly set this
/// property, when you call <see cref="ZipFile.Save()"/>, this name will
/// specify the name of the zip file created. Doing so is equivalent to
/// calling <see cref="ZipFile.Save(String)"/>. When instantiating a
/// <c>ZipFile</c> by reading from a stream or byte array, the <c>Name</c>
/// property remains <c>null</c>. When saving to a stream, the <c>Name</c>
/// property is implicitly set to <c>null</c>.
/// </para>
/// </remarks>
public string Name
{
get { return _name; }
set { _name = value; }
}
/// <summary>
/// Sets the compression level to be used for entries subsequently added to
/// the zip archive.
/// </summary>
///
/// <remarks>
/// <para>
/// Varying the compression level used on entries can affect the
/// size-vs-speed tradeoff when compression and decompressing data streams
/// or files.
/// </para>
///
/// <para>
/// As with some other properties on the <c>ZipFile</c> class, like <see
/// cref="Password"/>, <see cref="Encryption"/>, and <see
/// cref="ZipErrorAction"/>, setting this property on a <c>ZipFile</c>
/// instance will cause the specified <c>CompressionLevel</c> to be used on all
/// <see cref="ZipEntry"/> items that are subsequently added to the
/// <c>ZipFile</c> instance. If you set this property after you have added
/// items to the <c>ZipFile</c>, but before you have called <c>Save()</c>,
/// those items will not use the specified compression level.
/// </para>
///
/// <para>
/// If you do not set this property, the default compression level is used,
/// which normally gives a good balance of compression efficiency and
/// compression speed. In some tests, using <c>BestCompression</c> can
/// double the time it takes to compress, while delivering just a small
/// increase in compression efficiency. This behavior will vary with the
/// type of data you compress. If you are in doubt, just leave this setting
/// alone, and accept the default.
/// </para>
/// </remarks>
public Ionic.Zlib.CompressionLevel CompressionLevel
{
get;
set;
}
/// <summary>
/// The compression method for the zipfile.
/// </summary>
/// <remarks>
/// <para>
/// By default, the compression method is <c>CompressionMethod.Deflate.</c>
/// </para>
/// </remarks>
/// <seealso cref="Ionic.Zip.CompressionMethod" />
public Ionic.Zip.CompressionMethod CompressionMethod
{
get
{
return _compressionMethod;
}
set
{
_compressionMethod = value;
}
}
/// <summary>
/// A comment attached to the zip archive.
/// </summary>
///
/// <remarks>
///
/// <para>
/// This property is read/write. It allows the application to specify a
/// comment for the <c>ZipFile</c>, or read the comment for the
/// <c>ZipFile</c>. After setting this property, changes are only made
/// permanent when you call a <c>Save()</c> method.
/// </para>
///
/// <para>
/// According to <see
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">PKWARE's
/// zip specification</see>, the comment is not encrypted, even if there is a
/// password set on the zip file.
/// </para>
///
/// <para>
/// The specification does not describe how to indicate the encoding used
/// on a comment string. Many "compliant" zip tools and libraries use
/// IBM437 as the code page for comments; DotNetZip, too, follows that
/// practice. On the other hand, there are situations where you want a
/// Comment to be encoded with something else, for example using code page
/// 950 "Big-5 Chinese". To fill that need, DotNetZip will encode the
/// comment following the same procedure it follows for encoding
/// filenames: (a) if <see cref="AlternateEncodingUsage"/> is
/// <c>Never</c>, it uses the default encoding (IBM437). (b) if <see
/// cref="AlternateEncodingUsage"/> is <c>Always</c>, it always uses the
/// alternate encoding (<see cref="AlternateEncoding"/>). (c) if <see
/// cref="AlternateEncodingUsage"/> is <c>AsNecessary</c>, it uses the
/// alternate encoding only if the default encoding is not sufficient for
/// encoding the comment - in other words if decoding the result does not
/// produce the original string. This decision is taken at the time of
/// the call to <c>ZipFile.Save()</c>.
/// </para>
///
/// <para>
/// When creating a zip archive using this library, it is possible to change
/// the value of <see cref="AlternateEncoding" /> between each
/// entry you add, and between adding entries and the call to
/// <c>Save()</c>. Don't do this. It will likely result in a zip file that is
/// not readable by any tool or application. For best interoperability, leave
/// <see cref="AlternateEncoding"/> alone, or specify it only
/// once, before adding any entries to the <c>ZipFile</c> instance.
/// </para>
///
/// </remarks>
public string Comment
{
get { return _Comment; }
set
{
_Comment = value;
_contentsChanged = true;
}
}
/// <summary>
/// Specifies whether the Creation, Access, and Modified times for entries
/// added to the zip file will be emitted in &#147;Windows format&#148;
/// when the zip archive is saved.
/// </summary>
///
/// <remarks>
/// <para>
/// An application creating a zip archive can use this flag to explicitly
/// specify that the file times for the entries should or should not be stored
/// in the zip archive in the format used by Windows. By default this flag is
/// <c>true</c>, meaning the Windows-format times are stored in the zip
/// archive.
/// </para>
///
/// <para>
/// When adding an entry from a file or directory, the Creation (<see
/// cref="ZipEntry.CreationTime"/>), Access (<see
/// cref="ZipEntry.AccessedTime"/>), and Modified (<see
/// cref="ZipEntry.ModifiedTime"/>) times for the given entry are
/// automatically set from the filesystem values. When adding an entry from a
/// stream or string, all three values are implicitly set to
/// <c>DateTime.Now</c>. Applications can also explicitly set those times by
/// calling <see cref="ZipEntry.SetEntryTimes(DateTime, DateTime,
/// DateTime)"/>.
/// </para>
///
/// <para>
/// <see
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">PKWARE's
/// zip specification</see> describes multiple ways to format these times in a
/// zip file. One is the format Windows applications normally use: 100ns ticks
/// since January 1, 1601 UTC. The other is a format Unix applications typically
/// use: seconds since January 1, 1970 UTC. Each format can be stored in an
/// "extra field" in the zip entry when saving the zip archive. The former
/// uses an extra field with a Header Id of 0x000A, while the latter uses a
/// header ID of 0x5455, although you probably don't need to know that.
/// </para>
///
/// <para>
/// Not all tools and libraries can interpret these fields. Windows
/// compressed folders is one that can read the Windows Format timestamps,
/// while I believe <see href="http://www.info-zip.org/">the Infozip
/// tools</see> can read the Unix format timestamps. Some tools and libraries
/// may be able to read only one or the other. DotNetZip can read or write
/// times in either or both formats.
/// </para>
///
/// <para>
/// The times stored are taken from <see cref="ZipEntry.ModifiedTime"/>, <see
/// cref="ZipEntry.AccessedTime"/>, and <see cref="ZipEntry.CreationTime"/>.
/// </para>
///
/// <para>
/// The value set here applies to all entries subsequently added to the
/// <c>ZipFile</c>.
/// </para>
///
/// <para>
/// This property is not mutually exclusive of the <see
/// cref="EmitTimesInUnixFormatWhenSaving" /> property. It is possible and
/// legal and valid to produce a zip file that contains timestamps encoded in
/// the Unix format as well as in the Windows format, in addition to the <see
/// cref="ZipEntry.LastModified">LastModified</see> time attached to each
/// entry in the archive, a time that is always stored in "DOS format". And,
/// notwithstanding the names PKWare uses for these time formats, any of them
/// can be read and written by any computer, on any operating system. But,
/// there are no guarantees that a program running on Mac or Linux will
/// gracefully handle a zip file with "Windows" formatted times, or that an
/// application that does not use DotNetZip but runs on Windows will be able to
/// handle file times in Unix format.
/// </para>
///
/// <para>
/// When in doubt, test. Sorry, I haven't got a complete list of tools and
/// which sort of timestamps they can use and will tolerate. If you get any
/// good information and would like to pass it on, please do so and I will
/// include that information in this documentation.
/// </para>
/// </remarks>
///
/// <example>
/// This example shows how to save a zip file that contains file timestamps
/// in a format normally used by Unix.
/// <code lang="C#">
/// using (var zip = new ZipFile())
/// {
/// // produce a zip file the Mac will like
/// zip.EmitTimesInWindowsFormatWhenSaving = false;
/// zip.EmitTimesInUnixFormatWhenSaving = true;
/// zip.AddDirectory(directoryToZip, "files");
/// zip.Save(outputFile);
/// }
/// </code>
///
/// <code lang="VB">
/// Using zip As New ZipFile
/// '' produce a zip file the Mac will like
/// zip.EmitTimesInWindowsFormatWhenSaving = False
/// zip.EmitTimesInUnixFormatWhenSaving = True
/// zip.AddDirectory(directoryToZip, "files")
/// zip.Save(outputFile)
/// End Using
/// </code>
/// </example>
///
/// <seealso cref="ZipEntry.EmitTimesInWindowsFormatWhenSaving" />
/// <seealso cref="EmitTimesInUnixFormatWhenSaving" />
public bool EmitTimesInWindowsFormatWhenSaving
{
get
{
return _emitNtfsTimes;
}
set
{
_emitNtfsTimes = value;
}
}
/// <summary>
/// Specifies whether the Creation, Access, and Modified times
/// for entries added to the zip file will be emitted in "Unix(tm)
/// format" when the zip archive is saved.
/// </summary>
///
/// <remarks>
/// <para>
/// An application creating a zip archive can use this flag to explicitly
/// specify that the file times for the entries should or should not be stored
/// in the zip archive in the format used by Unix. By default this flag is
/// <c>false</c>, meaning the Unix-format times are not stored in the zip
/// archive.
/// </para>
///
/// <para>
/// When adding an entry from a file or directory, the Creation (<see
/// cref="ZipEntry.CreationTime"/>), Access (<see
/// cref="ZipEntry.AccessedTime"/>), and Modified (<see
/// cref="ZipEntry.ModifiedTime"/>) times for the given entry are
/// automatically set from the filesystem values. When adding an entry from a
/// stream or string, all three values are implicitly set to DateTime.Now.
/// Applications can also explicitly set those times by calling <see
/// cref="ZipEntry.SetEntryTimes(DateTime, DateTime, DateTime)"/>.
/// </para>
///
/// <para>
/// <see
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">PKWARE's
/// zip specification</see> describes multiple ways to format these times in a
/// zip file. One is the format Windows applications normally use: 100ns ticks
/// since January 1, 1601 UTC. The other is a format Unix applications
/// typically use: seconds since January 1, 1970 UTC. Each format can be
/// stored in an "extra field" in the zip entry when saving the zip
/// archive. The former uses an extra field with a Header Id of 0x000A, while
/// the latter uses a header ID of 0x5455, although you probably don't need to
/// know that.
/// </para>
///
/// <para>
/// Not all tools and libraries can interpret these fields. Windows
/// compressed folders is one that can read the Windows Format timestamps,
/// while I believe the <see href="http://www.info-zip.org/">Infozip</see>
/// tools can read the Unix format timestamps. Some tools and libraries may be
/// able to read only one or the other. DotNetZip can read or write times in
/// either or both formats.
/// </para>
///
/// <para>
/// The times stored are taken from <see cref="ZipEntry.ModifiedTime"/>, <see
/// cref="ZipEntry.AccessedTime"/>, and <see cref="ZipEntry.CreationTime"/>.
/// </para>
///
/// <para>
/// This property is not mutually exclusive of the <see
/// cref="EmitTimesInWindowsFormatWhenSaving" /> property. It is possible and
/// legal and valid to produce a zip file that contains timestamps encoded in
/// the Unix format as well as in the Windows format, in addition to the <see
/// cref="ZipEntry.LastModified">LastModified</see> time attached to each
/// entry in the zip archive, a time that is always stored in "DOS
/// format". And, notwithstanding the names PKWare uses for these time
/// formats, any of them can be read and written by any computer, on any
/// operating system. But, there are no guarantees that a program running on
/// Mac or Linux will gracefully handle a zip file with "Windows" formatted
/// times, or that an application that does not use DotNetZip but runs on
/// Windows will be able to handle file times in Unix format.
/// </para>
///
/// <para>
/// When in doubt, test. Sorry, I haven't got a complete list of tools and
/// which sort of timestamps they can use and will tolerate. If you get any
/// good information and would like to pass it on, please do so and I will
/// include that information in this documentation.
/// </para>
/// </remarks>
///
/// <seealso cref="ZipEntry.EmitTimesInUnixFormatWhenSaving" />
/// <seealso cref="EmitTimesInWindowsFormatWhenSaving" />
public bool EmitTimesInUnixFormatWhenSaving
{
get
{
return _emitUnixTimes;
}
set
{
_emitUnixTimes = value;
}
}
/// <summary>
/// Indicates whether verbose output is sent to the <see
/// cref="StatusMessageTextWriter"/> during <c>AddXxx()</c> and
/// <c>ReadXxx()</c> operations.
/// </summary>
///
/// <remarks>
/// This is a <em>synthetic</em> property. It returns true if the <see
/// cref="StatusMessageTextWriter"/> is non-null.
/// </remarks>
internal bool Verbose
{
get { return (_StatusMessageTextWriter != null); }
}
/// <summary>
/// Returns true if an entry by the given name exists in the ZipFile.
/// </summary>
///
/// <param name='name'>the name of the entry to find</param>
/// <returns>true if an entry with the given name exists; otherwise false.
/// </returns>
public bool ContainsEntry(string name)
{
// workitem 12534
return _entries.ContainsKey(SharedUtilities.NormalizePathForUseInZipFile(name));
}
/// <summary>
/// Indicates whether to perform case-sensitive matching on the filename when
/// retrieving entries in the zipfile via the string-based indexer.
/// </summary>
///
/// <remarks>
/// The default value is <c>false</c>, which means don't do case-sensitive
/// matching. In other words, retrieving zip["ReadMe.Txt"] is the same as
/// zip["readme.txt"]. It really makes sense to set this to <c>true</c> only
/// if you are not running on Windows, which has case-insensitive
/// filenames. But since this library is not built for non-Windows platforms,
/// in most cases you should just leave this property alone.
/// </remarks>
public bool CaseSensitiveRetrieval
{
get
{
return _CaseSensitiveRetrieval;
}
set
{
// workitem 9868
if (value != _CaseSensitiveRetrieval)
{
_CaseSensitiveRetrieval = value;
_initEntriesDictionary();
}
}
}
/// <summary>
/// Indicates whether to encode entry filenames and entry comments using Unicode
/// (UTF-8).
/// </summary>
///
/// <remarks>
/// <para>
/// <see href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">The
/// PKWare zip specification</see> provides for encoding file names and file
/// comments in either the IBM437 code page, or in UTF-8. This flag selects
/// the encoding according to that specification. By default, this flag is
/// false, and filenames and comments are encoded into the zip file in the
/// IBM437 codepage. Setting this flag to true will specify that filenames
/// and comments that cannot be encoded with IBM437 will be encoded with
/// UTF-8.
/// </para>
///
/// <para>
/// Zip files created with strict adherence to the PKWare specification with
/// respect to UTF-8 encoding can contain entries with filenames containing
/// any combination of Unicode characters, including the full range of
/// characters from Chinese, Latin, Hebrew, Greek, Cyrillic, and many other
/// alphabets. However, because at this time, the UTF-8 portion of the PKWare
/// specification is not broadly supported by other zip libraries and
/// utilities, such zip files may not be readable by your favorite zip tool or
/// archiver. In other words, interoperability will decrease if you set this
/// flag to true.
/// </para>
///
/// <para>
/// In particular, Zip files created with strict adherence to the PKWare
/// specification with respect to UTF-8 encoding will not work well with
/// Explorer in Windows XP or Windows Vista, because Windows compressed
/// folders, as far as I know, do not support UTF-8 in zip files. Vista can
/// read the zip files, but shows the filenames incorrectly. Unpacking from
/// Windows Vista Explorer will result in filenames that have rubbish
/// characters in place of the high-order UTF-8 bytes.
/// </para>
///
/// <para>
/// Also, zip files that use UTF-8 encoding will not work well with Java
/// applications that use the java.util.zip classes, as of v5.0 of the Java
/// runtime. The Java runtime does not correctly implement the PKWare
/// specification in this regard.
/// </para>
///
/// <para>
/// As a result, we have the unfortunate situation that "correct" behavior by
/// the DotNetZip library with regard to Unicode encoding of filenames during
/// zip creation will result in zip files that are readable by strictly
/// compliant and current tools (for example the most recent release of the
/// commercial WinZip tool); but these zip files will not be readable by
/// various other tools or libraries, including Windows Explorer.
/// </para>
///
/// <para>
/// The DotNetZip library can read and write zip files with UTF8-encoded
/// entries, according to the PKware spec. If you use DotNetZip for both
/// creating and reading the zip file, and you use UTF-8, there will be no
/// loss of information in the filenames. For example, using a self-extractor
/// created by this library will allow you to unpack files correctly with no
/// loss of information in the filenames.
/// </para>
///
/// <para>
/// If you do not set this flag, it will remain false. If this flag is false,
/// your <c>ZipFile</c> will encode all filenames and comments using the
/// IBM437 codepage. This can cause "loss of information" on some filenames,
/// but the resulting zipfile will be more interoperable with other
/// utilities. As an example of the loss of information, diacritics can be
/// lost. The o-tilde character will be down-coded to plain o. The c with a
/// cedilla (Unicode 0xE7) used in Portugese will be downcoded to a c.
/// Likewise, the O-stroke character (Unicode 248), used in Danish and
/// Norwegian, will be down-coded to plain o. Chinese characters cannot be
/// represented in codepage IBM437; when using the default encoding, Chinese
/// characters in filenames will be represented as ?. These are all examples
/// of "information loss".
/// </para>
///
/// <para>
/// The loss of information associated to the use of the IBM437 encoding is
/// inconvenient, and can also lead to runtime errors. For example, using
/// IBM437, any sequence of 4 Chinese characters will be encoded as ????. If
/// your application creates a <c>ZipFile</c>, then adds two files, each with
/// names of four Chinese characters each, this will result in a duplicate
/// filename exception. In the case where you add a single file with a name
/// containing four Chinese characters, calling Extract() on the entry that
/// has question marks in the filename will result in an exception, because
/// the question mark is not legal for use within filenames on Windows. These
/// are just a few examples of the problems associated to loss of information.
/// </para>
///
/// <para>
/// This flag is independent of the encoding of the content within the entries
/// in the zip file. Think of the zip file as a container - it supports an
/// encoding. Within the container are other "containers" - the file entries
/// themselves. The encoding within those entries is independent of the
/// encoding of the zip archive container for those entries.
/// </para>
///
/// <para>
/// Rather than specify the encoding in a binary fashion using this flag, an
/// application can specify an arbitrary encoding via the <see
/// cref="ProvisionalAlternateEncoding"/> property. Setting the encoding
/// explicitly when creating zip archives will result in non-compliant zip
/// files that, curiously, are fairly interoperable. The challenge is, the
/// PKWare specification does not provide for a way to specify that an entry
/// in a zip archive uses a code page that is neither IBM437 nor UTF-8.
/// Therefore if you set the encoding explicitly when creating a zip archive,
/// you must take care upon reading the zip archive to use the same code page.
/// If you get it wrong, the behavior is undefined and may result in incorrect
/// filenames, exceptions, stomach upset, hair loss, and acne.
/// </para>
/// </remarks>
/// <seealso cref="ProvisionalAlternateEncoding"/>
[Obsolete("Beginning with v1.9.1.6 of DotNetZip, this property is obsolete. It will be removed in a future version of the library. Your applications should use AlternateEncoding and AlternateEncodingUsage instead.")]
public bool UseUnicodeAsNecessary
{
get
{
return (_alternateEncoding == System.Text.Encoding.GetEncoding("UTF-8")) &&
(_alternateEncodingUsage == ZipOption.AsNecessary);
}
set
{
if (value)
{
_alternateEncoding = System.Text.Encoding.GetEncoding("UTF-8");
_alternateEncodingUsage = ZipOption.AsNecessary;
}
else
{
_alternateEncoding = Ionic.Zip.ZipFile.DefaultEncoding;
_alternateEncodingUsage = ZipOption.Never;
}
}
}
/// <summary>
/// Specify whether to use ZIP64 extensions when saving a zip archive.
/// </summary>
///
/// <remarks>
///
/// <para>
/// When creating a zip file, the default value for the property is <see
/// cref="Zip64Option.Never"/>. <see cref="Zip64Option.AsNecessary"/> is
/// safest, in the sense that you will not get an Exception if a pre-ZIP64
/// limit is exceeded.
/// </para>
///
/// <para>
/// You may set the property at any time before calling Save().
/// </para>
///
/// <para>
/// When reading a zip file via the <c>Zipfile.Read()</c> method, DotNetZip
/// will properly read ZIP64-endowed zip archives, regardless of the value of
/// this property. DotNetZip will always read ZIP64 archives. This property
/// governs only whether DotNetZip will write them. Therefore, when updating
/// archives, be careful about setting this property after reading an archive
/// that may use ZIP64 extensions.
/// </para>
///
/// <para>
/// An interesting question is, if you have set this property to
/// <c>AsNecessary</c>, and then successfully saved, does the resulting
/// archive use ZIP64 extensions or not? To learn this, check the <see
/// cref="OutputUsedZip64"/> property, after calling <c>Save()</c>.
/// </para>
///
/// <para>
/// Have you thought about
/// <see href="http://cheeso.members.winisp.net/DotNetZipDonate.aspx">donating</see>?
/// </para>
///
/// </remarks>
/// <seealso cref="RequiresZip64"/>
public Zip64Option UseZip64WhenSaving
{
get
{
return _zip64;
}
set
{
_zip64 = value;
}
}
/// <summary>
/// Indicates whether the archive requires ZIP64 extensions.
/// </summary>
///
/// <remarks>
///
/// <para>
/// This property is <c>null</c> (or <c>Nothing</c> in VB) if the archive has
/// not been saved, and there are fewer than 65334 <c>ZipEntry</c> items
/// contained in the archive.
/// </para>
///
/// <para>
/// The <c>Value</c> is true if any of the following four conditions holds:
/// the uncompressed size of any entry is larger than 0xFFFFFFFF; the
/// compressed size of any entry is larger than 0xFFFFFFFF; the relative
/// offset of any entry within the zip archive is larger than 0xFFFFFFFF; or
/// there are more than 65534 entries in the archive. (0xFFFFFFFF =
/// 4,294,967,295). The result may not be known until a <c>Save()</c> is attempted
/// on the zip archive. The Value of this <see cref="System.Nullable"/>
/// property may be set only AFTER one of the Save() methods has been called.
/// </para>
///
/// <para>
/// If none of the four conditions holds, and the archive has been saved, then
/// the <c>Value</c> is false.
/// </para>
///
/// <para>
/// A <c>Value</c> of false does not indicate that the zip archive, as saved,
/// does not use ZIP64. It merely indicates that ZIP64 is not required. An
/// archive may use ZIP64 even when not required if the <see
/// cref="ZipFile.UseZip64WhenSaving"/> property is set to <see
/// cref="Zip64Option.Always"/>, or if the <see
/// cref="ZipFile.UseZip64WhenSaving"/> property is set to <see
/// cref="Zip64Option.AsNecessary"/> and the output stream was not
/// seekable. Use the <see cref="OutputUsedZip64"/> property to determine if
/// the most recent <c>Save()</c> method resulted in an archive that utilized
/// the ZIP64 extensions.
/// </para>
///
/// </remarks>
/// <seealso cref="UseZip64WhenSaving"/>
/// <seealso cref="OutputUsedZip64"/>
public Nullable<bool> RequiresZip64
{
get
{
if (_entries.Count > 65534)
return new Nullable<bool>(true);
// If the <c>ZipFile</c> has not been saved or if the contents have changed, then
// it is not known if ZIP64 is required.
if (!_hasBeenSaved || _contentsChanged) return null;
// Whether ZIP64 is required is knowable.
foreach (ZipEntry e in _entries.Values)
{
if (e.RequiresZip64.Value) return new Nullable<bool>(true);
}
return new Nullable<bool>(false);
}
}
/// <summary>
/// Indicates whether the most recent <c>Save()</c> operation used ZIP64 extensions.
/// </summary>
///
/// <remarks>
/// <para>
/// The use of ZIP64 extensions within an archive is not always necessary, and
/// for interoperability concerns, it may be desired to NOT use ZIP64 if
/// possible. The <see cref="ZipFile.UseZip64WhenSaving"/> property can be
/// set to use ZIP64 extensions only when necessary. In those cases,
/// Sometimes applications want to know whether a Save() actually used ZIP64
/// extensions. Applications can query this read-only property to learn
/// whether ZIP64 has been used in a just-saved <c>ZipFile</c>.
/// </para>
///
/// <para>
/// The value is <c>null</c> (or <c>Nothing</c> in VB) if the archive has not
/// been saved.
/// </para>
///
/// <para>
/// Non-null values (<c>HasValue</c> is true) indicate whether ZIP64
/// extensions were used during the most recent <c>Save()</c> operation. The
/// ZIP64 extensions may have been used as required by any particular entry
/// because of its uncompressed or compressed size, or because the archive is
/// larger than 4294967295 bytes, or because there are more than 65534 entries
/// in the archive, or because the <c>UseZip64WhenSaving</c> property was set
/// to <see cref="Zip64Option.Always"/>, or because the
/// <c>UseZip64WhenSaving</c> property was set to <see
/// cref="Zip64Option.AsNecessary"/> and the output stream was not seekable.
/// The value of this property does not indicate the reason the ZIP64
/// extensions were used.
/// </para>
///
/// </remarks>
/// <seealso cref="UseZip64WhenSaving"/>
/// <seealso cref="RequiresZip64"/>
public Nullable<bool> OutputUsedZip64
{
get
{
return _OutputUsesZip64;
}
}
/// <summary>
/// Indicates whether the most recent <c>Read()</c> operation read a zip file that uses
/// ZIP64 extensions.
/// </summary>
///
/// <remarks>
/// This property will return null (Nothing in VB) if you've added an entry after reading
/// the zip file.
/// </remarks>
public Nullable<bool> InputUsesZip64
{
get
{
if (_entries.Count > 65534)
return true;
foreach (ZipEntry e in this)
{
// if any entry was added after reading the zip file, then the result is null
if (e.Source != ZipEntrySource.ZipFile) return null;
// if any entry read from the zip used zip64, then the result is true
if (e._InputUsesZip64) return true;
}
return false;
}
}
/// <summary>
/// The text encoding to use when writing new entries to the <c>ZipFile</c>,
/// for those entries that cannot be encoded with the default (IBM437)
/// encoding; or, the text encoding that was used when reading the entries
/// from the <c>ZipFile</c>.
/// </summary>
///
/// <remarks>
/// <para>
/// In <see href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">its
/// zip specification</see>, PKWare describes two options for encoding
/// filenames and comments: using IBM437 or UTF-8. But, some archiving tools
/// or libraries do not follow the specification, and instead encode
/// characters using the system default code page. For example, WinRAR when
/// run on a machine in Shanghai may encode filenames with the Big-5 Chinese
/// (950) code page. This behavior is contrary to the Zip specification, but
/// it occurs anyway.
/// </para>
///
/// <para>
/// When using DotNetZip to write zip archives that will be read by one of
/// these other archivers, set this property to specify the code page to use
/// when encoding the <see cref="ZipEntry.FileName"/> and <see
/// cref="ZipEntry.Comment"/> for each <c>ZipEntry</c> in the zip file, for
/// values that cannot be encoded with the default codepage for zip files,
/// IBM437. This is why this property is "provisional". In all cases, IBM437
/// is used where possible, in other words, where no loss of data would
/// result. It is possible, therefore, to have a given entry with a
/// <c>Comment</c> encoded in IBM437 and a <c>FileName</c> encoded with the
/// specified "provisional" codepage.
/// </para>
///
/// <para>
/// Be aware that a zip file created after you've explicitly set the <see
/// cref="ProvisionalAlternateEncoding" /> property to a value other than
/// IBM437 may not be compliant to the PKWare specification, and may not be
/// readable by compliant archivers. On the other hand, many (most?)
/// archivers are non-compliant and can read zip files created in arbitrary
/// code pages. The trick is to use or specify the proper codepage when
/// reading the zip.
/// </para>
///
/// <para>
/// When creating a zip archive using this library, it is possible to change
/// the value of <see cref="ProvisionalAlternateEncoding" /> between each
/// entry you add, and between adding entries and the call to
/// <c>Save()</c>. Don't do this. It will likely result in a zipfile that is
/// not readable. For best interoperability, either leave <see
/// cref="ProvisionalAlternateEncoding" /> alone, or specify it only once,
/// before adding any entries to the <c>ZipFile</c> instance. There is one
/// exception to this recommendation, described later.
/// </para>
///
/// <para>
/// When using an arbitrary, non-UTF8 code page for encoding, there is no
/// standard way for the creator application - whether DotNetZip, WinZip,
/// WinRar, or something else - to formally specify in the zip file which
/// codepage has been used for the entries. As a result, readers of zip files
/// are not able to inspect the zip file and determine the codepage that was
/// used for the entries contained within it. It is left to the application
/// or user to determine the necessary codepage when reading zip files encoded
/// this way. In other words, if you explicitly specify the codepage when you
/// create the zipfile, you must explicitly specify the same codepage when
/// reading the zipfile.
/// </para>
///
/// <para>
/// The way you specify the code page to use when reading a zip file varies
/// depending on the tool or library you use to read the zip. In DotNetZip,
/// you use a ZipFile.Read() method that accepts an encoding parameter. It
/// isn't possible with Windows Explorer, as far as I know, to specify an
/// explicit codepage to use when reading a zip. If you use an incorrect
/// codepage when reading a zipfile, you will get entries with filenames that
/// are incorrect, and the incorrect filenames may even contain characters
/// that are not legal for use within filenames in Windows. Extracting entries
/// with illegal characters in the filenames will lead to exceptions. It's too
/// bad, but this is just the way things are with code pages in zip
/// files. Caveat Emptor.
/// </para>
///
/// <para>
/// Example: Suppose you create a zipfile that contains entries with
/// filenames that have Danish characters. If you use <see
/// cref="ProvisionalAlternateEncoding" /> equal to "iso-8859-1" (cp 28591),
/// the filenames will be correctly encoded in the zip. But, to read that
/// zipfile correctly, you have to specify the same codepage at the time you
/// read it. If try to read that zip file with Windows Explorer or another
/// application that is not flexible with respect to the codepage used to
/// decode filenames in zipfiles, you will get a filename like "Inf<6E>.txt".
/// </para>
///
/// <para>
/// When using DotNetZip to read a zip archive, and the zip archive uses an
/// arbitrary code page, you must specify the encoding to use before or when
/// the <c>Zipfile</c> is READ. This means you must use a <c>ZipFile.Read()</c>
/// method that allows you to specify a System.Text.Encoding parameter. Setting
/// the ProvisionalAlternateEncoding property after your application has read in
/// the zip archive will not affect the entry names of entries that have already
/// been read in.
/// </para>
///
/// <para>
/// And now, the exception to the rule described above. One strategy for
/// specifying the code page for a given zip file is to describe the code page
/// in a human-readable form in the Zip comment. For example, the comment may
/// read "Entries in this archive are encoded in the Big5 code page". For
/// maximum interoperability, the zip comment in this case should be encoded
/// in the default, IBM437 code page. In this case, the zip comment is
/// encoded using a different page than the filenames. To do this, Specify
/// <c>ProvisionalAlternateEncoding</c> to your desired region-specific code
/// page, once before adding any entries, and then reset
/// <c>ProvisionalAlternateEncoding</c> to IBM437 before setting the <see
/// cref="Comment"/> property and calling Save().
/// </para>
/// </remarks>
///
/// <example>
/// This example shows how to read a zip file using the Big-5 Chinese code page
/// (950), and extract each entry in the zip file. For this code to work as
/// desired, the <c>Zipfile</c> must have been created using the big5 code page
/// (CP950). This is typical, for example, when using WinRar on a machine with
/// CP950 set as the default code page. In that case, the names of entries
/// within the Zip archive will be stored in that code page, and reading the zip
/// archive must be done using that code page. If the application did not use
/// the correct code page in <c>ZipFile.Read()</c>, then names of entries within the
/// zip archive would not be correctly retrieved.
/// <code>
/// using (var zip = ZipFile.Read(zipFileName, System.Text.Encoding.GetEncoding("big5")))
/// {
/// // retrieve and extract an entry using a name encoded with CP950
/// zip[MyDesiredEntry].Extract("unpack");
/// }
/// </code>
///
/// <code lang="VB">
/// Using zip As ZipFile = ZipFile.Read(ZipToExtract, System.Text.Encoding.GetEncoding("big5"))
/// ' retrieve and extract an entry using a name encoded with CP950
/// zip(MyDesiredEntry).Extract("unpack")
/// End Using
/// </code>
/// </example>
///
/// <seealso cref="Ionic.Zip.ZipFile.DefaultEncoding">DefaultEncoding</seealso>
[Obsolete("use AlternateEncoding instead.")]
public System.Text.Encoding ProvisionalAlternateEncoding
{
get
{
if (_alternateEncodingUsage == ZipOption.AsNecessary)
return _alternateEncoding;
return null;
}
set
{
_alternateEncoding = value;
_alternateEncodingUsage = ZipOption.AsNecessary;
}
}
/// <summary>
/// A Text Encoding to use when encoding the filenames and comments for
/// all the ZipEntry items, during a ZipFile.Save() operation.
/// </summary>
/// <remarks>
/// <para>
/// Whether the encoding specified here is used during the save depends
/// on <see cref="AlternateEncodingUsage"/>.
/// </para>
/// </remarks>
public System.Text.Encoding AlternateEncoding
{
get
{
return _alternateEncoding;
}
set
{
_alternateEncoding = value;
}
}
/// <summary>
/// A flag that tells if and when this instance should apply
/// AlternateEncoding to encode the filenames and comments associated to
/// of ZipEntry objects contained within this instance.
/// </summary>
public ZipOption AlternateEncodingUsage
{
get
{
return _alternateEncodingUsage;
}
set
{
_alternateEncodingUsage = value;
}
}
/// <summary>
/// The default text encoding used in zip archives. It is numeric 437, also
/// known as IBM437.
/// </summary>
/// <seealso cref="Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>
public static System.Text.Encoding DefaultEncoding
{
get
{
return _defaultEncoding;
}
}
/// <summary>
/// Gets or sets the <c>TextWriter</c> to which status messages are delivered
/// for the instance.
/// </summary>
///
/// <remarks>
/// If the TextWriter is set to a non-null value, then verbose output is sent
/// to the <c>TextWriter</c> during <c>Add</c><c>, Read</c><c>, Save</c> and
/// <c>Extract</c> operations. Typically, console applications might use
/// <c>Console.Out</c> and graphical or headless applications might use a
/// <c>System.IO.StringWriter</c>. The output of this is suitable for viewing
/// by humans.
/// </remarks>
///
/// <example>
/// <para>
/// In this example, a console application instantiates a <c>ZipFile</c>, then
/// sets the <c>StatusMessageTextWriter</c> to <c>Console.Out</c>. At that
/// point, all verbose status messages for that <c>ZipFile</c> are sent to the
/// console.
/// </para>
///
/// <code lang="C#">
/// using (ZipFile zip= ZipFile.Read(FilePath))
/// {
/// zip.StatusMessageTextWriter= System.Console.Out;
/// // messages are sent to the console during extraction
/// zip.ExtractAll();
/// }
/// </code>
///
/// <code lang="VB">
/// Using zip As ZipFile = ZipFile.Read(FilePath)
/// zip.StatusMessageTextWriter= System.Console.Out
/// 'Status Messages will be sent to the console during extraction
/// zip.ExtractAll()
/// End Using
/// </code>
///
/// <para>
/// In this example, a Windows Forms application instantiates a
/// <c>ZipFile</c>, then sets the <c>StatusMessageTextWriter</c> to a
/// <c>StringWriter</c>. At that point, all verbose status messages for that
/// <c>ZipFile</c> are sent to the <c>StringWriter</c>.
/// </para>
///
/// <code lang="C#">
/// var sw = new System.IO.StringWriter();
/// using (ZipFile zip= ZipFile.Read(FilePath))
/// {
/// zip.StatusMessageTextWriter= sw;
/// zip.ExtractAll();
/// }
/// Console.WriteLine("{0}", sw.ToString());
/// </code>
///
/// <code lang="VB">
/// Dim sw as New System.IO.StringWriter
/// Using zip As ZipFile = ZipFile.Read(FilePath)
/// zip.StatusMessageTextWriter= sw
/// zip.ExtractAll()
/// End Using
/// 'Status Messages are now available in sw
///
/// </code>
/// </example>
public TextWriter StatusMessageTextWriter
{
get { return _StatusMessageTextWriter; }
set { _StatusMessageTextWriter = value; }
}
/// <summary>
/// Gets or sets the name for the folder to store the temporary file
/// this library writes when saving a zip archive.
/// </summary>
///
/// <remarks>
/// <para>
/// This library will create a temporary file when saving a Zip archive to a
/// file. This file is written when calling one of the <c>Save()</c> methods
/// that does not save to a stream, or one of the <c>SaveSelfExtractor()</c>
/// methods.
/// </para>
///
/// <para>
/// By default, the library will create the temporary file in the directory
/// specified for the file itself, via the <see cref="Name"/> property or via
/// the <see cref="ZipFile.Save(String)"/> method.
/// </para>
///
/// <para>
/// Setting this property allows applications to override this default
/// behavior, so that the library will create the temporary file in the
/// specified folder. For example, to have the library create the temporary
/// file in the current working directory, regardless where the <c>ZipFile</c>
/// is saved, specfy ".". To revert to the default behavior, set this
/// property to <c>null</c> (<c>Nothing</c> in VB).
/// </para>
///
/// <para>
/// When setting the property to a non-null value, the folder specified must
/// exist; if it does not an exception is thrown. The application should have
/// write and delete permissions on the folder. The permissions are not
/// explicitly checked ahead of time; if the application does not have the
/// appropriate rights, an exception will be thrown at the time <c>Save()</c>
/// is called.
/// </para>
///
/// <para>
/// There is no temporary file created when reading a zip archive. When
/// saving to a Stream, there is no temporary file created. For example, if
/// the application is an ASP.NET application and calls <c>Save()</c>
/// specifying the <c>Response.OutputStream</c> as the output stream, there is
/// no temporary file created.
/// </para>
/// </remarks>
///
/// <exception cref="System.IO.FileNotFoundException">
/// Thrown when setting the property if the directory does not exist.
/// </exception>
///
public String TempFileFolder
{
get { return _TempFileFolder; }
set
{
_TempFileFolder = value;
if (value == null) return;
if (!Directory.Exists(value))
throw new FileNotFoundException(String.Format("That directory ({0}) does not exist.", value));
}
}
/// <summary>
/// Sets the password to be used on the <c>ZipFile</c> instance.
/// </summary>
///
/// <remarks>
///
/// <para>
/// When writing a zip archive, this password is applied to the entries, not
/// to the zip archive itself. It applies to any <c>ZipEntry</c> subsequently
/// added to the <c>ZipFile</c>, using one of the <c>AddFile</c>,
/// <c>AddDirectory</c>, <c>AddEntry</c>, or <c>AddItem</c> methods, etc.
/// When reading a zip archive, this property applies to any entry
/// subsequently extracted from the <c>ZipFile</c> using one of the Extract
/// methods on the <c>ZipFile</c> class.
/// </para>
///
/// <para>
/// When writing a zip archive, keep this in mind: though the password is set
/// on the ZipFile object, according to the Zip spec, the "directory" of the
/// archive - in other words the list of entries or files contained in the archive - is
/// not encrypted with the password, or protected in any way. If you set the
/// Password property, the password actually applies to individual entries
/// that are added to the archive, subsequent to the setting of this property.
/// The list of filenames in the archive that is eventually created will
/// appear in clear text, but the contents of the individual files are
/// encrypted. This is how Zip encryption works.
/// </para>
///
/// <para>
/// One simple way around this limitation is to simply double-wrap sensitive
/// filenames: Store the files in a zip file, and then store that zip file
/// within a second, "outer" zip file. If you apply a password to the outer
/// zip file, then readers will be able to see that the outer zip file
/// contains an inner zip file. But readers will not be able to read the
/// directory or file list of the inner zip file.
/// </para>
///
/// <para>
/// If you set the password on the <c>ZipFile</c>, and then add a set of files
/// to the archive, then each entry is encrypted with that password. You may
/// also want to change the password between adding different entries. If you
/// set the password, add an entry, then set the password to <c>null</c>
/// (<c>Nothing</c> in VB), and add another entry, the first entry is
/// encrypted and the second is not. If you call <c>AddFile()</c>, then set
/// the <c>Password</c> property, then call <c>ZipFile.Save</c>, the file
/// added will not be password-protected, and no warning will be generated.
/// </para>
///
/// <para>
/// When setting the Password, you may also want to explicitly set the <see
/// cref="Encryption"/> property, to specify how to encrypt the entries added
/// to the ZipFile. If you set the Password to a non-null value and do not
/// set <see cref="Encryption"/>, then PKZip 2.0 ("Weak") encryption is used.
/// This encryption is relatively weak but is very interoperable. If you set
/// the password to a <c>null</c> value (<c>Nothing</c> in VB), Encryption is
/// reset to None.
/// </para>
///
/// <para>
/// All of the preceding applies to writing zip archives, in other words when
/// you use one of the Save methods. To use this property when reading or an
/// existing ZipFile, do the following: set the Password property on the
/// <c>ZipFile</c>, then call one of the Extract() overloads on the <see
/// cref="ZipEntry" />. In this case, the entry is extracted using the
/// <c>Password</c> that is specified on the <c>ZipFile</c> instance. If you
/// have not set the <c>Password</c> property, then the password is
/// <c>null</c>, and the entry is extracted with no password.
/// </para>
///
/// <para>
/// If you set the Password property on the <c>ZipFile</c>, then call
/// <c>Extract()</c> an entry that has not been encrypted with a password, the
/// password is not used for that entry, and the <c>ZipEntry</c> is extracted
/// as normal. In other words, the password is used only if necessary.
/// </para>
///
/// <para>
/// The <see cref="ZipEntry"/> class also has a <see
/// cref="ZipEntry.Password">Password</see> property. It takes precedence
/// over this property on the <c>ZipFile</c>. Typically, you would use the
/// per-entry Password when most entries in the zip archive use one password,
/// and a few entries use a different password. If all entries in the zip
/// file use the same password, then it is simpler to just set this property
/// on the <c>ZipFile</c> itself, whether creating a zip archive or extracting
/// a zip archive.
/// </para>
///
/// </remarks>
///
/// <example>
/// <para>
/// This example creates a zip file, using password protection for the
/// entries, and then extracts the entries from the zip file. When creating
/// the zip file, the Readme.txt file is not protected with a password, but
/// the other two are password-protected as they are saved. During extraction,
/// each file is extracted with the appropriate password.
/// </para>
/// <code>
/// // create a file with encryption
/// using (ZipFile zip = new ZipFile())
/// {
/// zip.AddFile("ReadMe.txt");
/// zip.Password= "!Secret1";
/// zip.AddFile("MapToTheSite-7440-N49th.png");
/// zip.AddFile("2008-Regional-Sales-Report.pdf");
/// zip.Save("EncryptedArchive.zip");
/// }
///
/// // extract entries that use encryption
/// using (ZipFile zip = ZipFile.Read("EncryptedArchive.zip"))
/// {
/// zip.Password= "!Secret1";
/// zip.ExtractAll("extractDir");
/// }
///
/// </code>
///
/// <code lang="VB">
/// Using zip As New ZipFile
/// zip.AddFile("ReadMe.txt")
/// zip.Password = "123456!"
/// zip.AddFile("MapToTheSite-7440-N49th.png")
/// zip.Password= "!Secret1";
/// zip.AddFile("2008-Regional-Sales-Report.pdf")
/// zip.Save("EncryptedArchive.zip")
/// End Using
///
///
/// ' extract entries that use encryption
/// Using (zip as ZipFile = ZipFile.Read("EncryptedArchive.zip"))
/// zip.Password= "!Secret1"
/// zip.ExtractAll("extractDir")
/// End Using
///
/// </code>
///
/// </example>
///
/// <seealso cref="Ionic.Zip.ZipFile.Encryption">ZipFile.Encryption</seealso>
/// <seealso cref="Ionic.Zip.ZipEntry.Password">ZipEntry.Password</seealso>
public String Password
{
set
{
_Password = value;
if (_Password == null)
{
Encryption = EncryptionAlgorithm.None;
}
else if (Encryption == EncryptionAlgorithm.None)
{
Encryption = EncryptionAlgorithm.PkzipWeak;
}
}
private get
{
return _Password;
}
}
/// <summary>
/// The action the library should take when extracting a file that already
/// exists.
/// </summary>
///
/// <remarks>
/// <para>
/// This property affects the behavior of the Extract methods (one of the
/// <c>Extract()</c> or <c>ExtractWithPassword()</c> overloads), when
/// extraction would would overwrite an existing filesystem file. If you do
/// not set this property, the library throws an exception when extracting an
/// entry would overwrite an existing file.
/// </para>
///
/// <para>
/// This property has no effect when extracting to a stream, or when the file
/// to be extracted does not already exist.
/// </para>
/// </remarks>
/// <seealso cref="Ionic.Zip.ZipEntry.ExtractExistingFile"/>
public ExtractExistingFileAction ExtractExistingFile
{
get;
set;
}
/// <summary>
/// The action the library should take when an error is encountered while
/// opening or reading files as they are saved into a zip archive.
/// </summary>
///
/// <remarks>
/// <para>
/// Errors can occur as a file is being saved to the zip archive. For
/// example, the File.Open may fail, or a File.Read may fail, because of
/// lock conflicts or other reasons.
/// </para>
///
/// <para>
/// The first problem might occur after having called AddDirectory() on a
/// directory that contains a Clipper .dbf file; the file is locked by
/// Clipper and cannot be opened for read by another process. An example of
/// the second problem might occur when trying to zip a .pst file that is in
/// use by Microsoft Outlook. Outlook locks a range on the file, which allows
/// other processes to open the file, but not read it in its entirety.
/// </para>
///
/// <para>
/// This property tells DotNetZip what you would like to do in the case of
/// these errors. The primary options are: <c>ZipErrorAction.Throw</c> to
/// throw an exception (this is the default behavior if you don't set this
/// property); <c>ZipErrorAction.Skip</c> to Skip the file for which there
/// was an error and continue saving; <c>ZipErrorAction.Retry</c> to Retry
/// the entry that caused the problem; or
/// <c>ZipErrorAction.InvokeErrorEvent</c> to invoke an event handler.
/// </para>
///
/// <para>
/// This property is implicitly set to <c>ZipErrorAction.InvokeErrorEvent</c>
/// if you add a handler to the <see cref="ZipError" /> event. If you set
/// this property to something other than
/// <c>ZipErrorAction.InvokeErrorEvent</c>, then the <c>ZipError</c>
/// event is implicitly cleared. What it means is you can set one or the
/// other (or neither), depending on what you want, but you never need to set
/// both.
/// </para>
///
/// <para>
/// As with some other properties on the <c>ZipFile</c> class, like <see
/// cref="Password"/>, <see cref="Encryption"/>, and <see
/// cref="CompressionLevel"/>, setting this property on a <c>ZipFile</c>
/// instance will cause the specified <c>ZipErrorAction</c> to be used on all
/// <see cref="ZipEntry"/> items that are subsequently added to the
/// <c>ZipFile</c> instance. If you set this property after you have added
/// items to the <c>ZipFile</c>, but before you have called <c>Save()</c>,
/// those items will not use the specified error handling action.
/// </para>
///
/// <para>
/// If you want to handle any errors that occur with any entry in the zip
/// file in the same way, then set this property once, before adding any
/// entries to the zip archive.
/// </para>
///
/// <para>
/// If you set this property to <c>ZipErrorAction.Skip</c> and you'd like to
/// learn which files may have been skipped after a <c>Save()</c>, you can
/// set the <see cref="StatusMessageTextWriter" /> on the ZipFile before
/// calling <c>Save()</c>. A message will be emitted into that writer for
/// each skipped file, if any.
/// </para>
///
/// </remarks>
///
/// <example>
/// This example shows how to tell DotNetZip to skip any files for which an
/// error is generated during the Save().
/// <code lang="VB">
/// Public Sub SaveZipFile()
/// Dim SourceFolder As String = "fodder"
/// Dim DestFile As String = "eHandler.zip"
/// Dim sw as New StringWriter
/// Using zipArchive As ZipFile = New ZipFile
/// ' Tell DotNetZip to skip any files for which it encounters an error
/// zipArchive.ZipErrorAction = ZipErrorAction.Skip
/// zipArchive.StatusMessageTextWriter = sw
/// zipArchive.AddDirectory(SourceFolder)
/// zipArchive.Save(DestFile)
/// End Using
/// ' examine sw here to see any messages
/// End Sub
///
/// </code>
/// </example>
///
/// <seealso cref="Ionic.Zip.ZipEntry.ZipErrorAction"/>
/// <seealso cref="Ionic.Zip.ZipFile.ZipError"/>
public ZipErrorAction ZipErrorAction
{
get
{
if (ZipError != null)
_zipErrorAction = ZipErrorAction.InvokeErrorEvent;
return _zipErrorAction;
}
set
{
_zipErrorAction = value;
if (_zipErrorAction != ZipErrorAction.InvokeErrorEvent && ZipError != null)
ZipError = null;
}
}
/// <summary>
/// The Encryption to use for entries added to the <c>ZipFile</c>.
/// </summary>
///
/// <remarks>
/// <para>
/// Set this when creating a zip archive, or when updating a zip archive. The
/// specified Encryption is applied to the entries subsequently added to the
/// <c>ZipFile</c> instance. Applications do not need to set the
/// <c>Encryption</c> property when reading or extracting a zip archive.
/// </para>
///
/// <para>
/// If you set this to something other than EncryptionAlgorithm.None, you
/// will also need to set the <see cref="Password"/>.
/// </para>
///
/// <para>
/// As with some other properties on the <c>ZipFile</c> class, like <see
/// cref="Password"/> and <see cref="CompressionLevel"/>, setting this
/// property on a <c>ZipFile</c> instance will cause the specified
/// <c>EncryptionAlgorithm</c> to be used on all <see cref="ZipEntry"/> items
/// that are subsequently added to the <c>ZipFile</c> instance. In other
/// words, if you set this property after you have added items to the
/// <c>ZipFile</c>, but before you have called <c>Save()</c>, those items will
/// not be encrypted or protected with a password in the resulting zip
/// archive. To get a zip archive with encrypted entries, set this property,
/// along with the <see cref="Password"/> property, before calling
/// <c>AddFile</c>, <c>AddItem</c>, or <c>AddDirectory</c> (etc.) on the
/// <c>ZipFile</c> instance.
/// </para>
///
/// <para>
/// If you read a <c>ZipFile</c>, you can modify the <c>Encryption</c> on an
/// encrypted entry, only by setting the <c>Encryption</c> property on the
/// <c>ZipEntry</c> itself. Setting the <c>Encryption</c> property on the
/// <c>ZipFile</c>, once it has been created via a call to
/// <c>ZipFile.Read()</c>, does not affect entries that were previously read.
/// </para>
///
/// <para>
/// For example, suppose you read a <c>ZipFile</c>, and there is an encrypted
/// entry. Setting the <c>Encryption</c> property on that <c>ZipFile</c> and
/// then calling <c>Save()</c> on the <c>ZipFile</c> does not update the
/// <c>Encryption</c> used for the entries in the archive. Neither is an
/// exception thrown. Instead, what happens during the <c>Save()</c> is that
/// all previously existing entries are copied through to the new zip archive,
/// with whatever encryption and password that was used when originally
/// creating the zip archive. Upon re-reading that archive, to extract
/// entries, applications should use the original password or passwords, if
/// any.
/// </para>
///
/// <para>
/// Suppose an application reads a <c>ZipFile</c>, and there is an encrypted
/// entry. Setting the <c>Encryption</c> property on that <c>ZipFile</c> and
/// then adding new entries (via <c>AddFile()</c>, <c>AddEntry()</c>, etc)
/// and then calling <c>Save()</c> on the <c>ZipFile</c> does not update the
/// <c>Encryption</c> on any of the entries that had previously been in the
/// <c>ZipFile</c>. The <c>Encryption</c> property applies only to the
/// newly-added entries.
/// </para>
///
/// </remarks>
///
/// <example>
/// <para>
/// This example creates a zip archive that uses encryption, and then extracts
/// entries from the archive. When creating the zip archive, the ReadMe.txt
/// file is zipped without using a password or encryption. The other files
/// use encryption.
/// </para>
///
/// <code>
/// // Create a zip archive with AES Encryption.
/// using (ZipFile zip = new ZipFile())
/// {
/// zip.AddFile("ReadMe.txt");
/// zip.Encryption= EncryptionAlgorithm.WinZipAes256;
/// zip.Password= "Top.Secret.No.Peeking!";
/// zip.AddFile("7440-N49th.png");
/// zip.AddFile("2008-Regional-Sales-Report.pdf");
/// zip.Save("EncryptedArchive.zip");
/// }
///
/// // Extract a zip archive that uses AES Encryption.
/// // You do not need to specify the algorithm during extraction.
/// using (ZipFile zip = ZipFile.Read("EncryptedArchive.zip"))
/// {
/// zip.Password= "Top.Secret.No.Peeking!";
/// zip.ExtractAll("extractDirectory");
/// }
/// </code>
///
/// <code lang="VB">
/// ' Create a zip that uses Encryption.
/// Using zip As New ZipFile()
/// zip.Encryption= EncryptionAlgorithm.WinZipAes256
/// zip.Password= "Top.Secret.No.Peeking!"
/// zip.AddFile("ReadMe.txt")
/// zip.AddFile("7440-N49th.png")
/// zip.AddFile("2008-Regional-Sales-Report.pdf")
/// zip.Save("EncryptedArchive.zip")
/// End Using
///
/// ' Extract a zip archive that uses AES Encryption.
/// ' You do not need to specify the algorithm during extraction.
/// Using (zip as ZipFile = ZipFile.Read("EncryptedArchive.zip"))
/// zip.Password= "Top.Secret.No.Peeking!"
/// zip.ExtractAll("extractDirectory")
/// End Using
/// </code>
///
/// </example>
///
/// <seealso cref="Ionic.Zip.ZipFile.Password">ZipFile.Password</seealso>
/// <seealso cref="Ionic.Zip.ZipEntry.Encryption">ZipEntry.Encryption</seealso>
public EncryptionAlgorithm Encryption
{
get
{
return _Encryption;
}
set
{
if (value == EncryptionAlgorithm.Unsupported)
throw new InvalidOperationException("You may not set Encryption to that value.");
_Encryption = value;
}
}
/// <summary>
/// A callback that allows the application to specify the compression level
/// to use for entries subsequently added to the zip archive.
/// </summary>
///
/// <remarks>
///
/// <para>
/// With this callback, the DotNetZip library allows the application to
/// determine whether compression will be used, at the time of the
/// <c>Save</c>. This may be useful if the application wants to favor
/// speed over size, and wants to defer the decision until the time of
/// <c>Save</c>.
/// </para>
///
/// <para>
/// Typically applications set the <see cref="CompressionLevel"/> property on
/// the <c>ZipFile</c> or on each <c>ZipEntry</c> to determine the level of
/// compression used. This is done at the time the entry is added to the
/// <c>ZipFile</c>. Setting the property to
/// <c>Ionic.Zlib.CompressionLevel.None</c> means no compression will be used.
/// </para>
///
/// <para>
/// This callback allows the application to defer the decision on the
/// <c>CompressionLevel</c> to use, until the time of the call to
/// <c>ZipFile.Save()</c>. The callback is invoked once per <c>ZipEntry</c>,
/// at the time the data for the entry is being written out as part of a
/// <c>Save()</c> operation. The application can use whatever criteria it
/// likes in determining the level to return. For example, an application may
/// wish that no .mp3 files should be compressed, because they are already
/// compressed and the extra compression is not worth the CPU time incurred,
/// and so can return <c>None</c> for all .mp3 entries.
/// </para>
///
/// <para>
/// The library determines whether compression will be attempted for an entry
/// this way: If the entry is a zero length file, or a directory, no
/// compression is used. Otherwise, if this callback is set, it is invoked
/// and the <c>CompressionLevel</c> is set to the return value. If this
/// callback has not been set, then the previously set value for
/// <c>CompressionLevel</c> is used.
/// </para>
///
/// </remarks>
public SetCompressionCallback SetCompression
{
get;
set;
}
/// <summary>
/// The maximum size of an output segment, when saving a split Zip file.
/// </summary>
/// <remarks>
/// <para>
/// Set this to a non-zero value before calling <see cref="Save()"/> or <see
/// cref="Save(String)"/> to specify that the ZipFile should be saved as a
/// split archive, also sometimes called a spanned archive. Some also
/// call them multi-file archives.
/// </para>
///
/// <para>
/// A split zip archive is saved in a set of discrete filesystem files,
/// rather than in a single file. This is handy when transmitting the
/// archive in email or some other mechanism that has a limit to the size of
/// each file. The first file in a split archive will be named
/// <c>basename.z01</c>, the second will be named <c>basename.z02</c>, and
/// so on. The final file is named <c>basename.zip</c>. According to the zip
/// specification from PKWare, the minimum value is 65536, for a 64k segment
/// size. The maximum number of segments allows in a split archive is 99.
/// </para>
///
/// <para>
/// The value of this property determines the maximum size of a split
/// segment when writing a split archive. For example, suppose you have a
/// <c>ZipFile</c> that would save to a single file of 200k. If you set the
/// <c>MaxOutputSegmentSize</c> to 65536 before calling <c>Save()</c>, you
/// will get four distinct output files. On the other hand if you set this
/// property to 256k, then you will get a single-file archive for that
/// <c>ZipFile</c>.
/// </para>
///
/// <para>
/// The size of each split output file will be as large as possible, up to
/// the maximum size set here. The zip specification requires that some data
/// fields in a zip archive may not span a split boundary, and an output
/// segment may be smaller than the maximum if necessary to avoid that
/// problem. Also, obviously the final segment of the archive may be smaller
/// than the maximum segment size. Segments will never be larger than the
/// value set with this property.
/// </para>
///
/// <para>
/// You can save a split Zip file only when saving to a regular filesystem
/// file. It's not possible to save a split zip file as a self-extracting
/// archive, nor is it possible to save a split zip file to a stream. When
/// saving to a SFX or to a Stream, this property is ignored.
/// </para>
///
/// <para>
/// About interoperability: Split or spanned zip files produced by DotNetZip
/// can be read by WinZip or PKZip, and vice-versa. Segmented zip files may
/// not be readable by other tools, if those other tools don't support zip
/// spanning or splitting. When in doubt, test. I don't believe Windows
/// Explorer can extract a split archive.
/// </para>
///
/// <para>
/// This property has no effect when reading a split archive. You can read
/// a split archive in the normal way with DotNetZip.
/// </para>
///
/// <para>
/// When saving a zip file, if you want a regular zip file rather than a
/// split zip file, don't set this property, or set it to Zero.
/// </para>
///
/// <para>
/// If you read a split archive, with <see cref="ZipFile.Read(string)"/> and
/// then subsequently call <c>ZipFile.Save()</c>, unless you set this
/// property before calling <c>Save()</c>, you will get a normal,
/// single-file archive.
/// </para>
/// </remarks>
///
/// <seealso cref="NumberOfSegmentsForMostRecentSave"/>
public Int32 MaxOutputSegmentSize
{
get
{
return _maxOutputSegmentSize;
}
set
{
if (value < 65536 && value != 0)
throw new ZipException("The minimum acceptable segment size is 65536.");
_maxOutputSegmentSize = value;
}
}
/// <summary>
/// Returns the number of segments used in the most recent Save() operation.
/// </summary>
/// <remarks>
/// <para>
/// This is normally zero, unless you have set the <see
/// cref="MaxOutputSegmentSize"/> property. If you have set <see
/// cref="MaxOutputSegmentSize"/>, and then you save a file, after the call to
/// Save() completes, you can read this value to learn the number of segments that
/// were created.
/// </para>
/// <para>
/// If you call Save("Archive.zip"), and it creates 5 segments, then you
/// will have filesystem files named Archive.z01, Archive.z02, Archive.z03,
/// Archive.z04, and Archive.zip, and the value of this property will be 5.
/// </para>
/// </remarks>
/// <seealso cref="MaxOutputSegmentSize"/>
public Int32 NumberOfSegmentsForMostRecentSave
{
get
{
return unchecked((Int32)_numberOfSegmentsForMostRecentSave + 1);
}
}
#if !NETCF
/// <summary>
/// The size threshold for an entry, above which a parallel deflate is used.
/// </summary>
///
/// <remarks>
///
/// <para>
/// DotNetZip will use multiple threads to compress any ZipEntry,
/// if the entry is larger than the given size. Zero means "always
/// use parallel deflate", while -1 means "never use parallel
/// deflate". The default value for this property is 512k. Aside
/// from the special values of 0 and 1, the minimum value is 65536.
/// </para>
///
/// <para>
/// If the entry size cannot be known before compression, as with a
/// read-forward stream, then Parallel deflate will never be
/// performed, unless the value of this property is zero.
/// </para>
///
/// <para>
/// A parallel deflate operations will speed up the compression of
/// large files, on computers with multiple CPUs or multiple CPU
/// cores. For files above 1mb, on a dual core or dual-cpu (2p)
/// machine, the time required to compress the file can be 70% of the
/// single-threaded deflate. For very large files on 4p machines the
/// compression can be done in 30% of the normal time. The downside
/// is that parallel deflate consumes extra memory during the deflate,
/// and the deflation is not as effective.
/// </para>
///
/// <para>
/// Parallel deflate tends to yield slightly less compression when
/// compared to as single-threaded deflate; this is because the original
/// data stream is split into multiple independent buffers, each of which
/// is compressed in parallel. But because they are treated
/// independently, there is no opportunity to share compression
/// dictionaries. For that reason, a deflated stream may be slightly
/// larger when compressed using parallel deflate, as compared to a
/// traditional single-threaded deflate. Sometimes the increase over the
/// normal deflate is as much as 5% of the total compressed size. For
/// larger files it can be as small as 0.1%.
/// </para>
///
/// <para>
/// Multi-threaded compression does not give as much an advantage when
/// using Encryption. This is primarily because encryption tends to slow
/// down the entire pipeline. Also, multi-threaded compression gives less
/// of an advantage when using lower compression levels, for example <see
/// cref="Ionic.Zlib.CompressionLevel.BestSpeed"/>. You may have to
/// perform some tests to determine the best approach for your situation.
/// </para>
///
/// </remarks>
///
/// <seealso cref="ParallelDeflateMaxBufferPairs"/>
///
public long ParallelDeflateThreshold
{
set
{
if ((value != 0) && (value != -1) && (value < 64 * 1024))
throw new ArgumentOutOfRangeException("ParallelDeflateThreshold should be -1, 0, or > 65536");
_ParallelDeflateThreshold = value;
}
get
{
return _ParallelDeflateThreshold;
}
}
/// <summary>
/// The maximum number of buffer pairs to use when performing
/// parallel compression.
/// </summary>
///
/// <remarks>
/// <para>
/// This property sets an upper limit on the number of memory
/// buffer pairs to create when performing parallel
/// compression. The implementation of the parallel
/// compression stream allocates multiple buffers to
/// facilitate parallel compression. As each buffer fills up,
/// the stream uses <see
/// cref="System.Threading.ThreadPool.QueueUserWorkItem(System.Threading.WaitCallback)">
/// ThreadPool.QueueUserWorkItem()</see> to compress those
/// buffers in a background threadpool thread. After a buffer
/// is compressed, it is re-ordered and written to the output
/// stream.
/// </para>
///
/// <para>
/// A higher number of buffer pairs enables a higher degree of
/// parallelism, which tends to increase the speed of compression on
/// multi-cpu computers. On the other hand, a higher number of buffer
/// pairs also implies a larger memory consumption, more active worker
/// threads, and a higher cpu utilization for any compression. This
/// property enables the application to limit its memory consumption and
/// CPU utilization behavior depending on requirements.
/// </para>
///
/// <para>
/// For each compression "task" that occurs in parallel, there are 2
/// buffers allocated: one for input and one for output. This property
/// sets a limit for the number of pairs. The total amount of storage
/// space allocated for buffering will then be (N*S*2), where N is the
/// number of buffer pairs, S is the size of each buffer (<see
/// cref="BufferSize"/>). By default, DotNetZip allocates 4 buffer
/// pairs per CPU core, so if your machine has 4 cores, and you retain
/// the default buffer size of 128k, then the
/// ParallelDeflateOutputStream will use 4 * 4 * 2 * 128kb of buffer
/// memory in total, or 4mb, in blocks of 128kb. If you then set this
/// property to 8, then the number will be 8 * 2 * 128kb of buffer
/// memory, or 2mb.
/// </para>
///
/// <para>
/// CPU utilization will also go up with additional buffers, because a
/// larger number of buffer pairs allows a larger number of background
/// threads to compress in parallel. If you find that parallel
/// compression is consuming too much memory or CPU, you can adjust this
/// value downward.
/// </para>
///
/// <para>
/// The default value is 16. Different values may deliver better or
/// worse results, depending on your priorities and the dynamic
/// performance characteristics of your storage and compute resources.
/// </para>
///
/// <para>
/// This property is not the number of buffer pairs to use; it is an
/// upper limit. An illustration: Suppose you have an application that
/// uses the default value of this property (which is 16), and it runs
/// on a machine with 2 CPU cores. In that case, DotNetZip will allocate
/// 4 buffer pairs per CPU core, for a total of 8 pairs. The upper
/// limit specified by this property has no effect.
/// </para>
///
/// <para>
/// The application can set this value at any time
/// before calling <c>ZipFile.Save()</c>.
/// </para>
/// </remarks>
///
/// <seealso cref="ParallelDeflateThreshold"/>
///
public int ParallelDeflateMaxBufferPairs
{
get
{
return _maxBufferPairs;
}
set
{
if (value < 4)
throw new ArgumentOutOfRangeException("ParallelDeflateMaxBufferPairs",
"Value must be 4 or greater.");
_maxBufferPairs = value;
}
}
#endif
/// <summary>Provides a string representation of the instance.</summary>
/// <returns>a string representation of the instance.</returns>
public override String ToString()
{
return String.Format("ZipFile::{0}", Name);
}
/// <summary>
/// Returns the version number on the DotNetZip assembly.
/// </summary>
///
/// <remarks>
/// <para>
/// This property is exposed as a convenience. Callers could also get the
/// version value by retrieving GetName().Version on the
/// System.Reflection.Assembly object pointing to the DotNetZip
/// assembly. But sometimes it is not clear which assembly is being loaded.
/// This property makes it clear.
/// </para>
/// <para>
/// This static property is primarily useful for diagnostic purposes.
/// </para>
/// </remarks>
public static System.Version LibraryVersion
{
get
{
return System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
}
}
internal void NotifyEntryChanged()
{
_contentsChanged = true;
}
internal Stream StreamForDiskNumber(uint diskNumber)
{
if (diskNumber + 1 == this._diskNumberWithCd ||
(diskNumber == 0 && this._diskNumberWithCd == 0))
{
//return (this.ReadStream as FileStream);
return this.ReadStream;
}
return ZipSegmentedStream.ForReading(this._readName ?? this._name,
diskNumber, _diskNumberWithCd);
}
// called by ZipEntry in ZipEntry.Extract(), when there is no stream set for the
// ZipEntry.
internal void Reset(bool whileSaving)
{
if (_JustSaved)
{
// read in the just-saved zip archive
using (ZipFile x = new ZipFile())
{
// workitem 10735
x._readName = x._name = whileSaving
? (this._readName ?? this._name)
: this._name;
x.AlternateEncoding = this.AlternateEncoding;
x.AlternateEncodingUsage = this.AlternateEncodingUsage;
ReadIntoInstance(x);
// copy the contents of the entries.
// cannot just replace the entries - the app may be holding them
foreach (ZipEntry e1 in x)
{
foreach (ZipEntry e2 in this)
{
if (e1.FileName == e2.FileName)
{
e2.CopyMetaData(e1);
break;
}
}
}
}
_JustSaved = false;
}
}
#endregion
#region Constructors
/// <summary>
/// Creates a new <c>ZipFile</c> instance, using the specified filename.
/// </summary>
///
/// <remarks>
/// <para>
/// Applications can use this constructor to create a new ZipFile for writing,
/// or to slurp in an existing zip archive for read and update purposes.
/// </para>
///
/// <para>
/// To create a new zip archive, an application can call this constructor,
/// passing the name of a file that does not exist. The name may be a fully
/// qualified path. Then the application can add directories or files to the
/// <c>ZipFile</c> via <c>AddDirectory()</c>, <c>AddFile()</c>, <c>AddItem()</c>
/// and then write the zip archive to the disk by calling <c>Save()</c>. The
/// zip file is not actually opened and written to the disk until the
/// application calls <c>ZipFile.Save()</c>. At that point the new zip file
/// with the given name is created.
/// </para>
///
/// <para>
/// If you won't know the name of the <c>Zipfile</c> until the time you call
/// <c>ZipFile.Save()</c>, or if you plan to save to a stream (which has no
/// name), then you should use the no-argument constructor.
/// </para>
///
/// <para>
/// The application can also call this constructor to read an existing zip
/// archive. passing the name of a valid zip file that does exist. But, it's
/// better form to use the static <see cref="ZipFile.Read(String)"/> method,
/// passing the name of the zip file, because using <c>ZipFile.Read()</c> in
/// your code communicates very clearly what you are doing. In either case,
/// the file is then read into the <c>ZipFile</c> instance. The app can then
/// enumerate the entries or can modify the zip file, for example adding
/// entries, removing entries, changing comments, and so on.
/// </para>
///
/// <para>
/// One advantage to this parameterized constructor: it allows applications to
/// use the same code to add items to a zip archive, regardless of whether the
/// zip file exists.
/// </para>
///
/// <para>
/// Instances of the <c>ZipFile</c> class are not multi-thread safe. You may
/// not party on a single instance with multiple threads. You may have
/// multiple threads that each use a distinct <c>ZipFile</c> instance, or you
/// can synchronize multi-thread access to a single instance.
/// </para>
///
/// <para>
/// By the way, since DotNetZip is so easy to use, don't you think <see
/// href="http://cheeso.members.winisp.net/DotNetZipDonate.aspx">you should
/// donate $5 or $10</see>?
/// </para>
///
/// </remarks>
///
/// <exception cref="Ionic.Zip.ZipException">
/// Thrown if name refers to an existing file that is not a valid zip file.
/// </exception>
///
/// <example>
/// This example shows how to create a zipfile, and add a few files into it.
/// <code>
/// String ZipFileToCreate = "archive1.zip";
/// String DirectoryToZip = "c:\\reports";
/// using (ZipFile zip = new ZipFile())
/// {
/// // Store all files found in the top level directory, into the zip archive.
/// String[] filenames = System.IO.Directory.GetFiles(DirectoryToZip);
/// zip.AddFiles(filenames, "files");
/// zip.Save(ZipFileToCreate);
/// }
/// </code>
///
/// <code lang="VB">
/// Dim ZipFileToCreate As String = "archive1.zip"
/// Dim DirectoryToZip As String = "c:\reports"
/// Using zip As ZipFile = New ZipFile()
/// Dim filenames As String() = System.IO.Directory.GetFiles(DirectoryToZip)
/// zip.AddFiles(filenames, "files")
/// zip.Save(ZipFileToCreate)
/// End Using
/// </code>
/// </example>
///
/// <param name="fileName">The filename to use for the new zip archive.</param>
///
public ZipFile(string fileName)
{
try
{
_InitInstance(fileName, null);
}
catch (Exception e1)
{
throw new ZipException(String.Format("Could not read {0} as a zip file", fileName), e1);
}
}
/// <summary>
/// Creates a new <c>ZipFile</c> instance, using the specified name for the
/// filename, and the specified Encoding.
/// </summary>
///
/// <remarks>
/// <para>
/// See the documentation on the <see cref="ZipFile(String)">ZipFile
/// constructor that accepts a single string argument</see> for basic
/// information on all the <c>ZipFile</c> constructors.
/// </para>
///
/// <para>
/// The Encoding is used as the default alternate encoding for entries with
/// filenames or comments that cannot be encoded with the IBM437 code page.
/// This is equivalent to setting the <see
/// cref="ProvisionalAlternateEncoding"/> property on the <c>ZipFile</c>
/// instance after construction.
/// </para>
///
/// <para>
/// Instances of the <c>ZipFile</c> class are not multi-thread safe. You may
/// not party on a single instance with multiple threads. You may have
/// multiple threads that each use a distinct <c>ZipFile</c> instance, or you
/// can synchronize multi-thread access to a single instance.
/// </para>
///
/// </remarks>
///
/// <exception cref="Ionic.Zip.ZipException">
/// Thrown if name refers to an existing file that is not a valid zip file.
/// </exception>
///
/// <param name="fileName">The filename to use for the new zip archive.</param>
/// <param name="encoding">The Encoding is used as the default alternate
/// encoding for entries with filenames or comments that cannot be encoded
/// with the IBM437 code page. </param>
public ZipFile(string fileName, System.Text.Encoding encoding)
{
try
{
AlternateEncoding = encoding;
AlternateEncodingUsage = ZipOption.Always;
_InitInstance(fileName, null);
}
catch (Exception e1)
{
throw new ZipException(String.Format("{0} is not a valid zip file", fileName), e1);
}
}
/// <summary>
/// Create a zip file, without specifying a target filename or stream to save to.
/// </summary>
///
/// <remarks>
/// <para>
/// See the documentation on the <see cref="ZipFile(String)">ZipFile
/// constructor that accepts a single string argument</see> for basic
/// information on all the <c>ZipFile</c> constructors.
/// </para>
///
/// <para>
/// After instantiating with this constructor and adding entries to the
/// archive, the application should call <see cref="ZipFile.Save(String)"/> or
/// <see cref="ZipFile.Save(System.IO.Stream)"/> to save to a file or a
/// stream, respectively. The application can also set the <see cref="Name"/>
/// property and then call the no-argument <see cref="Save()"/> method. (This
/// is the preferred approach for applications that use the library through
/// COM interop.) If you call the no-argument <see cref="Save()"/> method
/// without having set the <c>Name</c> of the <c>ZipFile</c>, either through
/// the parameterized constructor or through the explicit property , the
/// Save() will throw, because there is no place to save the file. </para>
///
/// <para>
/// Instances of the <c>ZipFile</c> class are not multi-thread safe. You may
/// have multiple threads that each use a distinct <c>ZipFile</c> instance, or
/// you can synchronize multi-thread access to a single instance. </para>
///
/// </remarks>
///
/// <example>
/// This example creates a Zip archive called Backup.zip, containing all the files
/// in the directory DirectoryToZip. Files within subdirectories are not zipped up.
/// <code>
/// using (ZipFile zip = new ZipFile())
/// {
/// // Store all files found in the top level directory, into the zip archive.
/// // note: this code does not recurse subdirectories!
/// String[] filenames = System.IO.Directory.GetFiles(DirectoryToZip);
/// zip.AddFiles(filenames, "files");
/// zip.Save("Backup.zip");
/// }
/// </code>
///
/// <code lang="VB">
/// Using zip As New ZipFile
/// ' Store all files found in the top level directory, into the zip archive.
/// ' note: this code does not recurse subdirectories!
/// Dim filenames As String() = System.IO.Directory.GetFiles(DirectoryToZip)
/// zip.AddFiles(filenames, "files")
/// zip.Save("Backup.zip")
/// End Using
/// </code>
/// </example>
public ZipFile()
{
_InitInstance(null, null);
}
/// <summary>
/// Create a zip file, specifying a text Encoding, but without specifying a
/// target filename or stream to save to.
/// </summary>
///
/// <remarks>
/// <para>
/// See the documentation on the <see cref="ZipFile(String)">ZipFile
/// constructor that accepts a single string argument</see> for basic
/// information on all the <c>ZipFile</c> constructors.
/// </para>
///
/// </remarks>
///
/// <param name="encoding">
/// The Encoding is used as the default alternate encoding for entries with
/// filenames or comments that cannot be encoded with the IBM437 code page.
/// </param>
public ZipFile(System.Text.Encoding encoding)
{
AlternateEncoding = encoding;
AlternateEncodingUsage = ZipOption.Always;
_InitInstance(null, null);
}
/// <summary>
/// Creates a new <c>ZipFile</c> instance, using the specified name for the
/// filename, and the specified status message writer.
/// </summary>
///
/// <remarks>
/// <para>
/// See the documentation on the <see cref="ZipFile(String)">ZipFile
/// constructor that accepts a single string argument</see> for basic
/// information on all the <c>ZipFile</c> constructors.
/// </para>
///
/// <para>
/// This version of the constructor allows the caller to pass in a TextWriter,
/// to which verbose messages will be written during extraction or creation of
/// the zip archive. A console application may wish to pass
/// System.Console.Out to get messages on the Console. A graphical or headless
/// application may wish to capture the messages in a different
/// <c>TextWriter</c>, for example, a <c>StringWriter</c>, and then display
/// the messages in a TextBox, or generate an audit log of ZipFile operations.
/// </para>
///
/// <para>
/// To encrypt the data for the files added to the <c>ZipFile</c> instance,
/// set the Password property after creating the <c>ZipFile</c> instance.
/// </para>
///
/// <para>
/// Instances of the <c>ZipFile</c> class are not multi-thread safe. You may
/// not party on a single instance with multiple threads. You may have
/// multiple threads that each use a distinct <c>ZipFile</c> instance, or you
/// can synchronize multi-thread access to a single instance.
/// </para>
///
/// </remarks>
///
/// <exception cref="Ionic.Zip.ZipException">
/// Thrown if name refers to an existing file that is not a valid zip file.
/// </exception>
///
/// <example>
/// <code>
/// using (ZipFile zip = new ZipFile("Backup.zip", Console.Out))
/// {
/// // Store all files found in the top level directory, into the zip archive.
/// // note: this code does not recurse subdirectories!
/// // Status messages will be written to Console.Out
/// String[] filenames = System.IO.Directory.GetFiles(DirectoryToZip);
/// zip.AddFiles(filenames);
/// zip.Save();
/// }
/// </code>
///
/// <code lang="VB">
/// Using zip As New ZipFile("Backup.zip", Console.Out)
/// ' Store all files found in the top level directory, into the zip archive.
/// ' note: this code does not recurse subdirectories!
/// ' Status messages will be written to Console.Out
/// Dim filenames As String() = System.IO.Directory.GetFiles(DirectoryToZip)
/// zip.AddFiles(filenames)
/// zip.Save()
/// End Using
/// </code>
/// </example>
///
/// <param name="fileName">The filename to use for the new zip archive.</param>
/// <param name="statusMessageWriter">A TextWriter to use for writing
/// verbose status messages.</param>
public ZipFile(string fileName, TextWriter statusMessageWriter)
{
try
{
_InitInstance(fileName, statusMessageWriter);
}
catch (Exception e1)
{
throw new ZipException(String.Format("{0} is not a valid zip file", fileName), e1);
}
}
/// <summary>
/// Creates a new <c>ZipFile</c> instance, using the specified name for the
/// filename, the specified status message writer, and the specified Encoding.
/// </summary>
///
/// <remarks>
/// <para>
/// This constructor works like the <see cref="ZipFile(String)">ZipFile
/// constructor that accepts a single string argument.</see> See that
/// reference for detail on what this constructor does.
/// </para>
///
/// <para>
/// This version of the constructor allows the caller to pass in a
/// <c>TextWriter</c>, and an Encoding. The <c>TextWriter</c> will collect
/// verbose messages that are generated by the library during extraction or
/// creation of the zip archive. A console application may wish to pass
/// <c>System.Console.Out</c> to get messages on the Console. A graphical or
/// headless application may wish to capture the messages in a different
/// <c>TextWriter</c>, for example, a <c>StringWriter</c>, and then display
/// the messages in a <c>TextBox</c>, or generate an audit log of
/// <c>ZipFile</c> operations.
/// </para>
///
/// <para>
/// The <c>Encoding</c> is used as the default alternate encoding for entries
/// with filenames or comments that cannot be encoded with the IBM437 code
/// page. This is a equivalent to setting the <see
/// cref="ProvisionalAlternateEncoding"/> property on the <c>ZipFile</c>
/// instance after construction.
/// </para>
///
/// <para>
/// To encrypt the data for the files added to the <c>ZipFile</c> instance,
/// set the <c>Password</c> property after creating the <c>ZipFile</c>
/// instance.
/// </para>
///
/// <para>
/// Instances of the <c>ZipFile</c> class are not multi-thread safe. You may
/// not party on a single instance with multiple threads. You may have
/// multiple threads that each use a distinct <c>ZipFile</c> instance, or you
/// can synchronize multi-thread access to a single instance.
/// </para>
///
/// </remarks>
///
/// <exception cref="Ionic.Zip.ZipException">
/// Thrown if <c>fileName</c> refers to an existing file that is not a valid zip file.
/// </exception>
///
/// <param name="fileName">The filename to use for the new zip archive.</param>
/// <param name="statusMessageWriter">A TextWriter to use for writing verbose
/// status messages.</param>
/// <param name="encoding">
/// The Encoding is used as the default alternate encoding for entries with
/// filenames or comments that cannot be encoded with the IBM437 code page.
/// </param>
public ZipFile(string fileName, TextWriter statusMessageWriter,
System.Text.Encoding encoding)
{
try
{
AlternateEncoding = encoding;
AlternateEncodingUsage = ZipOption.Always;
_InitInstance(fileName, statusMessageWriter);
}
catch (Exception e1)
{
throw new ZipException(String.Format("{0} is not a valid zip file", fileName), e1);
}
}
/// <summary>
/// Initialize a <c>ZipFile</c> instance by reading in a zip file.
/// </summary>
///
/// <remarks>
///
/// <para>
/// This method is primarily useful from COM Automation environments, when
/// reading or extracting zip files. In COM, it is not possible to invoke
/// parameterized constructors for a class. A COM Automation application can
/// update a zip file by using the <see cref="ZipFile()">default (no argument)
/// constructor</see>, then calling <c>Initialize()</c> to read the contents
/// of an on-disk zip archive into the <c>ZipFile</c> instance.
/// </para>
///
/// <para>
/// .NET applications are encouraged to use the <c>ZipFile.Read()</c> methods
/// for better clarity.
/// </para>
///
/// </remarks>
/// <param name="fileName">the name of the existing zip file to read in.</param>
public void Initialize(string fileName)
{
try
{
_InitInstance(fileName, null);
}
catch (Exception e1)
{
throw new ZipException(String.Format("{0} is not a valid zip file", fileName), e1);
}
}
private void _initEntriesDictionary()
{
// workitem 9868
StringComparer sc = (CaseSensitiveRetrieval) ? StringComparer.Ordinal : StringComparer.OrdinalIgnoreCase;
_entries = (_entries == null)
? new Dictionary<String, ZipEntry>(sc)
: new Dictionary<String, ZipEntry>(_entries, sc);
}
private void _InitInstance(string zipFileName, TextWriter statusMessageWriter)
{
// create a new zipfile
_name = zipFileName;
_StatusMessageTextWriter = statusMessageWriter;
_contentsChanged = true;
AddDirectoryWillTraverseReparsePoints = true; // workitem 8617
CompressionLevel = Ionic.Zlib.CompressionLevel.Default;
#if !NETCF
ParallelDeflateThreshold = 512 * 1024;
#endif
// workitem 7685, 9868
_initEntriesDictionary();
if (File.Exists(_name))
{
if (FullScan)
ReadIntoInstance_Orig(this);
else
ReadIntoInstance(this);
this._fileAlreadyExists = true;
}
return;
}
#endregion
#region Indexers and Collections
private List<ZipEntry> ZipEntriesAsList
{
get
{
if (_zipEntriesAsList == null)
_zipEntriesAsList = new List<ZipEntry>(_entries.Values);
return _zipEntriesAsList;
}
}
/// <summary>
/// This is an integer indexer into the Zip archive.
/// </summary>
///
/// <remarks>
/// <para>
/// This property is read-only.
/// </para>
///
/// <para>
/// Internally, the <c>ZipEntry</c> instances that belong to the
/// <c>ZipFile</c> are stored in a Dictionary. When you use this
/// indexer the first time, it creates a read-only
/// <c>List&lt;ZipEntry&gt;</c> from the Dictionary.Values Collection.
/// If at any time you modify the set of entries in the <c>ZipFile</c>,
/// either by adding an entry, removing an entry, or renaming an
/// entry, a new List will be created, and the numeric indexes for the
/// remaining entries may be different.
/// </para>
///
/// <para>
/// This means you cannot rename any ZipEntry from
/// inside an enumeration of the zip file.
/// </para>
///
/// <param name="ix">
/// The index value.
/// </param>
///
/// </remarks>
///
/// <returns>
/// The <c>ZipEntry</c> within the Zip archive at the specified index. If the
/// entry does not exist in the archive, this indexer throws.
/// </returns>
///
public ZipEntry this[int ix]
{
// workitem 6402
get
{
return ZipEntriesAsList[ix];
}
}
/// <summary>
/// This is a name-based indexer into the Zip archive.
/// </summary>
///
/// <remarks>
/// <para>
/// This property is read-only.
/// </para>
///
/// <para>
/// The <see cref="CaseSensitiveRetrieval"/> property on the <c>ZipFile</c>
/// determines whether retrieval via this indexer is done via case-sensitive
/// comparisons. By default, retrieval is not case sensitive. This makes
/// sense on Windows, in which filesystems are not case sensitive.
/// </para>
///
/// <para>
/// Regardless of case-sensitivity, it is not always the case that
/// <c>this[value].FileName == value</c>. In other words, the <c>FileName</c>
/// property of the <c>ZipEntry</c> retrieved with this indexer, may or may
/// not be equal to the index value.
/// </para>
///
/// <para>
/// This is because DotNetZip performs a normalization of filenames passed to
/// this indexer, before attempting to retrieve the item. That normalization
/// includes: removal of a volume letter and colon, swapping backward slashes
/// for forward slashes. So, <c>zip["dir1\\entry1.txt"].FileName ==
/// "dir1/entry.txt"</c>.
/// </para>
///
/// <para>
/// Directory entries in the zip file may be retrieved via this indexer only
/// with names that have a trailing slash. DotNetZip automatically appends a
/// trailing slash to the names of any directory entries added to a zip.
/// </para>
///
/// </remarks>
///
/// <example>
/// This example extracts only the entries in a zip file that are .txt files.
/// <code>
/// using (ZipFile zip = ZipFile.Read("PackedDocuments.zip"))
/// {
/// foreach (string s1 in zip.EntryFilenames)
/// {
/// if (s1.EndsWith(".txt"))
/// zip[s1].Extract("textfiles");
/// }
/// }
/// </code>
/// <code lang="VB">
/// Using zip As ZipFile = ZipFile.Read("PackedDocuments.zip")
/// Dim s1 As String
/// For Each s1 In zip.EntryFilenames
/// If s1.EndsWith(".txt") Then
/// zip(s1).Extract("textfiles")
/// End If
/// Next
/// End Using
/// </code>
/// </example>
/// <seealso cref="Ionic.Zip.ZipFile.RemoveEntry(string)"/>
///
/// <exception cref="System.ArgumentException">
/// Thrown if the caller attempts to assign a non-null value to the indexer.
/// </exception>
///
/// <param name="fileName">
/// The name of the file, including any directory path, to retrieve from the
/// zip. The filename match is not case-sensitive by default; you can use the
/// <see cref="CaseSensitiveRetrieval"/> property to change this behavior. The
/// pathname can use forward-slashes or backward slashes.
/// </param>
///
/// <returns>
/// The <c>ZipEntry</c> within the Zip archive, given by the specified
/// filename. If the named entry does not exist in the archive, this indexer
/// returns <c>null</c> (<c>Nothing</c> in VB).
/// </returns>
///
public ZipEntry this[String fileName]
{
get
{
var key = SharedUtilities.NormalizePathForUseInZipFile(fileName);
if (_entries.ContainsKey(key))
return _entries[key];
// workitem 11056
key = key.Replace("/", "\\");
if (_entries.ContainsKey(key))
return _entries[key];
return null;
#if MESSY
foreach (ZipEntry e in _entries.Values)
{
if (this.CaseSensitiveRetrieval)
{
// check for the file match with a case-sensitive comparison.
if (e.FileName == fileName) return e;
// also check for equivalence
if (fileName.Replace("\\", "/") == e.FileName) return e;
if (e.FileName.Replace("\\", "/") == fileName) return e;
// check for a difference only in trailing slash
if (e.FileName.EndsWith("/"))
{
var fileNameNoSlash = e.FileName.Trim("/".ToCharArray());
if (fileNameNoSlash == fileName) return e;
// also check for equivalence
if (fileName.Replace("\\", "/") == fileNameNoSlash) return e;
if (fileNameNoSlash.Replace("\\", "/") == fileName) return e;
}
}
else
{
// check for the file match in a case-insensitive manner.
if (String.Compare(e.FileName, fileName, StringComparison.CurrentCultureIgnoreCase) == 0) return e;
// also check for equivalence
if (String.Compare(fileName.Replace("\\", "/"), e.FileName, StringComparison.CurrentCultureIgnoreCase) == 0) return e;
if (String.Compare(e.FileName.Replace("\\", "/"), fileName, StringComparison.CurrentCultureIgnoreCase) == 0) return e;
// check for a difference only in trailing slash
if (e.FileName.EndsWith("/"))
{
var fileNameNoSlash = e.FileName.Trim("/".ToCharArray());
if (String.Compare(fileNameNoSlash, fileName, StringComparison.CurrentCultureIgnoreCase) == 0) return e;
// also check for equivalence
if (String.Compare(fileName.Replace("\\", "/"), fileNameNoSlash, StringComparison.CurrentCultureIgnoreCase) == 0) return e;
if (String.Compare(fileNameNoSlash.Replace("\\", "/"), fileName, StringComparison.CurrentCultureIgnoreCase) == 0) return e;
}
}
}
return null;
#endif
}
}
/// <summary>
/// The list of filenames for the entries contained within the zip archive.
/// </summary>
///
/// <remarks>
/// According to the ZIP specification, the names of the entries use forward
/// slashes in pathnames. If you are scanning through the list, you may have
/// to swap forward slashes for backslashes.
/// </remarks>
///
/// <seealso cref="Ionic.Zip.ZipFile.this[string]"/>
///
/// <example>
/// This example shows one way to test if a filename is already contained
/// within a zip archive.
/// <code>
/// String zipFileToRead= "PackedDocuments.zip";
/// string candidate = "DatedMaterial.xps";
/// using (ZipFile zip = new ZipFile(zipFileToRead))
/// {
/// if (zip.EntryFilenames.Contains(candidate))
/// Console.WriteLine("The file '{0}' exists in the zip archive '{1}'",
/// candidate,
/// zipFileName);
/// else
/// Console.WriteLine("The file, '{0}', does not exist in the zip archive '{1}'",
/// candidate,
/// zipFileName);
/// Console.WriteLine();
/// }
/// </code>
/// <code lang="VB">
/// Dim zipFileToRead As String = "PackedDocuments.zip"
/// Dim candidate As String = "DatedMaterial.xps"
/// Using zip As ZipFile.Read(ZipFileToRead)
/// If zip.EntryFilenames.Contains(candidate) Then
/// Console.WriteLine("The file '{0}' exists in the zip archive '{1}'", _
/// candidate, _
/// zipFileName)
/// Else
/// Console.WriteLine("The file, '{0}', does not exist in the zip archive '{1}'", _
/// candidate, _
/// zipFileName)
/// End If
/// Console.WriteLine
/// End Using
/// </code>
/// </example>
///
/// <returns>
/// The list of strings for the filenames contained within the Zip archive.
/// </returns>
///
public System.Collections.Generic.ICollection<String> EntryFileNames
{
get
{
return _entries.Keys;
}
}
/// <summary>
/// Returns the readonly collection of entries in the Zip archive.
/// </summary>
///
/// <remarks>
///
/// <para>
/// If there are no entries in the current <c>ZipFile</c>, the value returned is a
/// non-null zero-element collection. If there are entries in the zip file,
/// the elements are returned in no particular order.
/// </para>
/// <para>
/// This is the implied enumerator on the <c>ZipFile</c> class. If you use a
/// <c>ZipFile</c> instance in a context that expects an enumerator, you will
/// get this collection.
/// </para>
/// </remarks>
/// <seealso cref="EntriesSorted"/>
public System.Collections.Generic.ICollection<ZipEntry> Entries
{
get
{
return _entries.Values;
}
}
/// <summary>
/// Returns a readonly collection of entries in the Zip archive, sorted by FileName.
/// </summary>
///
/// <remarks>
/// If there are no entries in the current <c>ZipFile</c>, the value returned
/// is a non-null zero-element collection. If there are entries in the zip
/// file, the elements are returned sorted by the name of the entry.
/// </remarks>
///
/// <example>
///
/// This example fills a Windows Forms ListView with the entries in a zip file.
///
/// <code lang="C#">
/// using (ZipFile zip = ZipFile.Read(zipFile))
/// {
/// foreach (ZipEntry entry in zip.EntriesSorted)
/// {
/// ListViewItem item = new ListViewItem(n.ToString());
/// n++;
/// string[] subitems = new string[] {
/// entry.FileName.Replace("/","\\"),
/// entry.LastModified.ToString("yyyy-MM-dd HH:mm:ss"),
/// entry.UncompressedSize.ToString(),
/// String.Format("{0,5:F0}%", entry.CompressionRatio),
/// entry.CompressedSize.ToString(),
/// (entry.UsesEncryption) ? "Y" : "N",
/// String.Format("{0:X8}", entry.Crc)};
///
/// foreach (String s in subitems)
/// {
/// ListViewItem.ListViewSubItem subitem = new ListViewItem.ListViewSubItem();
/// subitem.Text = s;
/// item.SubItems.Add(subitem);
/// }
///
/// this.listView1.Items.Add(item);
/// }
/// }
/// </code>
/// </example>
///
/// <seealso cref="Entries"/>
public System.Collections.Generic.ICollection<ZipEntry> EntriesSorted
{
get
{
var coll = new System.Collections.Generic.List<ZipEntry>();
foreach (var e in this.Entries)
{
coll.Add(e);
}
StringComparison sc = (CaseSensitiveRetrieval) ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase;
coll.Sort((x, y) => { return String.Compare(x.FileName, y.FileName, sc); });
return coll.AsReadOnly();
}
}
/// <summary>
/// Returns the number of entries in the Zip archive.
/// </summary>
public int Count
{
get
{
return _entries.Count;
}
}
/// <summary>
/// Removes the given <c>ZipEntry</c> from the zip archive.
/// </summary>
///
/// <remarks>
/// <para>
/// After calling <c>RemoveEntry</c>, the application must call <c>Save</c> to
/// make the changes permanent.
/// </para>
/// </remarks>
///
/// <exception cref="System.ArgumentException">
/// Thrown if the specified <c>ZipEntry</c> does not exist in the <c>ZipFile</c>.
/// </exception>
///
/// <example>
/// In this example, all entries in the zip archive dating from before
/// December 31st, 2007, are removed from the archive. This is actually much
/// easier if you use the RemoveSelectedEntries method. But I needed an
/// example for RemoveEntry, so here it is.
/// <code>
/// String ZipFileToRead = "ArchiveToModify.zip";
/// System.DateTime Threshold = new System.DateTime(2007,12,31);
/// using (ZipFile zip = ZipFile.Read(ZipFileToRead))
/// {
/// var EntriesToRemove = new System.Collections.Generic.List&lt;ZipEntry&gt;();
/// foreach (ZipEntry e in zip)
/// {
/// if (e.LastModified &lt; Threshold)
/// {
/// // We cannot remove the entry from the list, within the context of
/// // an enumeration of said list.
/// // So we add the doomed entry to a list to be removed later.
/// EntriesToRemove.Add(e);
/// }
/// }
///
/// // actually remove the doomed entries.
/// foreach (ZipEntry zombie in EntriesToRemove)
/// zip.RemoveEntry(zombie);
///
/// zip.Comment= String.Format("This zip archive was updated at {0}.",
/// System.DateTime.Now.ToString("G"));
///
/// // save with a different name
/// zip.Save("Archive-Updated.zip");
/// }
/// </code>
///
/// <code lang="VB">
/// Dim ZipFileToRead As String = "ArchiveToModify.zip"
/// Dim Threshold As New DateTime(2007, 12, 31)
/// Using zip As ZipFile = ZipFile.Read(ZipFileToRead)
/// Dim EntriesToRemove As New System.Collections.Generic.List(Of ZipEntry)
/// Dim e As ZipEntry
/// For Each e In zip
/// If (e.LastModified &lt; Threshold) Then
/// ' We cannot remove the entry from the list, within the context of
/// ' an enumeration of said list.
/// ' So we add the doomed entry to a list to be removed later.
/// EntriesToRemove.Add(e)
/// End If
/// Next
///
/// ' actually remove the doomed entries.
/// Dim zombie As ZipEntry
/// For Each zombie In EntriesToRemove
/// zip.RemoveEntry(zombie)
/// Next
/// zip.Comment = String.Format("This zip archive was updated at {0}.", DateTime.Now.ToString("G"))
/// 'save as a different name
/// zip.Save("Archive-Updated.zip")
/// End Using
/// </code>
/// </example>
///
/// <param name="entry">
/// The <c>ZipEntry</c> to remove from the zip.
/// </param>
///
/// <seealso cref="Ionic.Zip.ZipFile.RemoveSelectedEntries(string)"/>
///
public void RemoveEntry(ZipEntry entry)
{
//if (!_entries.Values.Contains(entry))
// throw new ArgumentException("The entry you specified does not exist in the zip archive.");
if (entry == null)
throw new ArgumentNullException("entry");
_entries.Remove(SharedUtilities.NormalizePathForUseInZipFile(entry.FileName));
_zipEntriesAsList = null;
#if NOTNEEDED
if (_direntries != null)
{
bool FoundAndRemovedDirEntry = false;
foreach (ZipDirEntry de1 in _direntries)
{
if (entry.FileName == de1.FileName)
{
_direntries.Remove(de1);
FoundAndRemovedDirEntry = true;
break;
}
}
if (!FoundAndRemovedDirEntry)
throw new BadStateException("The entry to be removed was not found in the directory.");
}
#endif
_contentsChanged = true;
}
/// <summary>
/// Removes the <c>ZipEntry</c> with the given filename from the zip archive.
/// </summary>
///
/// <remarks>
/// <para>
/// After calling <c>RemoveEntry</c>, the application must call <c>Save</c> to
/// make the changes permanent.
/// </para>
///
/// </remarks>
///
/// <exception cref="System.InvalidOperationException">
/// Thrown if the <c>ZipFile</c> is not updatable.
/// </exception>
///
/// <exception cref="System.ArgumentException">
/// Thrown if a <c>ZipEntry</c> with the specified filename does not exist in
/// the <c>ZipFile</c>.
/// </exception>
///
/// <example>
///
/// This example shows one way to remove an entry with a given filename from
/// an existing zip archive.
///
/// <code>
/// String zipFileToRead= "PackedDocuments.zip";
/// string candidate = "DatedMaterial.xps";
/// using (ZipFile zip = ZipFile.Read(zipFileToRead))
/// {
/// if (zip.EntryFilenames.Contains(candidate))
/// {
/// zip.RemoveEntry(candidate);
/// zip.Comment= String.Format("The file '{0}' has been removed from this archive.",
/// Candidate);
/// zip.Save();
/// }
/// }
/// </code>
/// <code lang="VB">
/// Dim zipFileToRead As String = "PackedDocuments.zip"
/// Dim candidate As String = "DatedMaterial.xps"
/// Using zip As ZipFile = ZipFile.Read(zipFileToRead)
/// If zip.EntryFilenames.Contains(candidate) Then
/// zip.RemoveEntry(candidate)
/// zip.Comment = String.Format("The file '{0}' has been removed from this archive.", Candidate)
/// zip.Save
/// End If
/// End Using
/// </code>
/// </example>
///
/// <param name="fileName">
/// The name of the file, including any directory path, to remove from the zip.
/// The filename match is not case-sensitive by default; you can use the
/// <c>CaseSensitiveRetrieval</c> property to change this behavior. The
/// pathname can use forward-slashes or backward slashes.
/// </param>
///
public void RemoveEntry(String fileName)
{
string modifiedName = ZipEntry.NameInArchive(fileName, null);
ZipEntry e = this[modifiedName];
if (e == null)
throw new ArgumentException("The entry you specified was not found in the zip archive.");
RemoveEntry(e);
}
#endregion
#region Destructors and Disposers
// /// <summary>
// /// This is the class Destructor, which gets called implicitly when the instance
// /// is destroyed. Because the <c>ZipFile</c> type implements IDisposable, this
// /// method calls Dispose(false).
// /// </summary>
// ~ZipFile()
// {
// // call Dispose with false. Since we're in the
// // destructor call, the managed resources will be
// // disposed of anyways.
// Dispose(false);
// }
/// <summary>
/// Closes the read and write streams associated
/// to the <c>ZipFile</c>, if necessary.
/// </summary>
///
/// <remarks>
/// The Dispose() method is generally employed implicitly, via a <c>using(..) {..}</c>
/// statement. (<c>Using...End Using</c> in VB) If you do not employ a using
/// statement, insure that your application calls Dispose() explicitly. For
/// example, in a Powershell application, or an application that uses the COM
/// interop interface, you must call Dispose() explicitly.
/// </remarks>
///
/// <example>
/// This example extracts an entry selected by name, from the Zip file to the
/// Console.
/// <code>
/// using (ZipFile zip = ZipFile.Read(zipfile))
/// {
/// foreach (ZipEntry e in zip)
/// {
/// if (WantThisEntry(e.FileName))
/// zip.Extract(e.FileName, Console.OpenStandardOutput());
/// }
/// } // Dispose() is called implicitly here.
/// </code>
///
/// <code lang="VB">
/// Using zip As ZipFile = ZipFile.Read(zipfile)
/// Dim e As ZipEntry
/// For Each e In zip
/// If WantThisEntry(e.FileName) Then
/// zip.Extract(e.FileName, Console.OpenStandardOutput())
/// End If
/// Next
/// End Using ' Dispose is implicity called here
/// </code>
/// </example>
public void Dispose()
{
// dispose of the managed and unmanaged resources
Dispose(true);
// tell the GC that the Finalize process no longer needs
// to be run for this object.
GC.SuppressFinalize(this);
}
/// <summary>
/// Disposes any managed resources, if the flag is set, then marks the
/// instance disposed. This method is typically not called explicitly from
/// application code.
/// </summary>
///
/// <remarks>
/// Applications should call <see cref="Dispose()">the no-arg Dispose method</see>.
/// </remarks>
///
/// <param name="disposeManagedResources">
/// indicates whether the method should dispose streams or not.
/// </param>
protected virtual void Dispose(bool disposeManagedResources)
{
if (!this._disposed)
{
if (disposeManagedResources)
{
// dispose managed resources
if (_ReadStreamIsOurs)
{
if (_readstream != null)
{
// workitem 7704
#if NETCF
_readstream.Close();
#else
_readstream.Dispose();
#endif
_readstream = null;
}
}
// only dispose the writestream if there is a backing file
if ((_temporaryFileName != null) && (_name != null))
if (_writestream != null)
{
// workitem 7704
#if NETCF
_writestream.Close();
#else
_writestream.Dispose();
#endif
_writestream = null;
}
#if !NETCF
// workitem 10030
if (this.ParallelDeflater != null)
{
this.ParallelDeflater.Dispose();
this.ParallelDeflater = null;
}
#endif
}
this._disposed = true;
}
}
#endregion
#region private properties
internal Stream ReadStream
{
get
{
if (_readstream == null)
{
if (_readName != null || _name !=null)
{
_readstream = File.Open(_readName ?? _name,
FileMode.Open,
FileAccess.Read,
FileShare.Read | FileShare.Write);
_ReadStreamIsOurs = true;
}
}
return _readstream;
}
}
private Stream WriteStream
{
// workitem 9763
get
{
if (_writestream != null) return _writestream;
if (_name == null) return _writestream;
if (_maxOutputSegmentSize != 0)
{
_writestream = ZipSegmentedStream.ForWriting(this._name, _maxOutputSegmentSize);
return _writestream;
}
SharedUtilities.CreateAndOpenUniqueTempFile(TempFileFolder ?? Path.GetDirectoryName(_name),
out _writestream,
out _temporaryFileName);
return _writestream;
}
set
{
if (value != null)
throw new ZipException("Cannot set the stream to a non-null value.");
_writestream = null;
}
}
#endregion
#region private fields
private TextWriter _StatusMessageTextWriter;
private bool _CaseSensitiveRetrieval;
private Stream _readstream;
private Stream _writestream;
private UInt16 _versionMadeBy;
private UInt16 _versionNeededToExtract;
private UInt32 _diskNumberWithCd;
private Int32 _maxOutputSegmentSize;
private UInt32 _numberOfSegmentsForMostRecentSave;
private ZipErrorAction _zipErrorAction;
private bool _disposed;
//private System.Collections.Generic.List<ZipEntry> _entries;
private System.Collections.Generic.Dictionary<String, ZipEntry> _entries;
private List<ZipEntry> _zipEntriesAsList;
private string _name;
private string _readName;
private string _Comment;
internal string _Password;
private bool _emitNtfsTimes = true;
private bool _emitUnixTimes;
private Ionic.Zlib.CompressionStrategy _Strategy = Ionic.Zlib.CompressionStrategy.Default;
private Ionic.Zip.CompressionMethod _compressionMethod = Ionic.Zip.CompressionMethod.Deflate;
private bool _fileAlreadyExists;
private string _temporaryFileName;
private bool _contentsChanged;
private bool _hasBeenSaved;
private String _TempFileFolder;
private bool _ReadStreamIsOurs = true;
private object LOCK = new object();
private bool _saveOperationCanceled;
private bool _extractOperationCanceled;
private bool _addOperationCanceled;
private EncryptionAlgorithm _Encryption;
private bool _JustSaved;
private long _locEndOfCDS = -1;
private uint _OffsetOfCentralDirectory;
private Int64 _OffsetOfCentralDirectory64;
private Nullable<bool> _OutputUsesZip64;
internal bool _inExtractAll;
private System.Text.Encoding _alternateEncoding = System.Text.Encoding.GetEncoding("IBM437"); // UTF-8
private ZipOption _alternateEncodingUsage = ZipOption.Never;
private static System.Text.Encoding _defaultEncoding = System.Text.Encoding.GetEncoding("IBM437");
private int _BufferSize = BufferSizeDefault;
#if !NETCF
internal Ionic.Zlib.ParallelDeflateOutputStream ParallelDeflater;
private long _ParallelDeflateThreshold;
private int _maxBufferPairs = 16;
#endif
internal Zip64Option _zip64 = Zip64Option.Default;
#pragma warning disable 649
private bool _SavingSfx;
#pragma warning restore 649
/// <summary>
/// Default size of the buffer used for IO.
/// </summary>
public static readonly int BufferSizeDefault = 32768;
#endregion
}
/// <summary>
/// Options for using ZIP64 extensions when saving zip archives.
/// </summary>
///
/// <remarks>
///
/// <para>
/// Designed many years ago, the <see
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">original zip
/// specification from PKWARE</see> allowed for 32-bit quantities for the
/// compressed and uncompressed sizes of zip entries, as well as a 32-bit quantity
/// for specifying the length of the zip archive itself, and a maximum of 65535
/// entries. These limits are now regularly exceeded in many backup and archival
/// scenarios. Recently, PKWare added extensions to the original zip spec, called
/// "ZIP64 extensions", to raise those limitations. This property governs whether
/// DotNetZip will use those extensions when writing zip archives. The use of
/// these extensions is optional and explicit in DotNetZip because, despite the
/// status of ZIP64 as a bona fide standard, many other zip tools and libraries do
/// not support ZIP64, and therefore a zip file with ZIP64 extensions may be
/// unreadable by some of those other tools.
/// </para>
///
/// <para>
/// Set this property to <see cref="Zip64Option.Always"/> to always use ZIP64
/// extensions when saving, regardless of whether your zip archive needs it.
/// Suppose you add 5 files, each under 100k, to a ZipFile. If you specify Always
/// for this flag, you will get a ZIP64 archive, though the archive does not need
/// to use ZIP64 because none of the original zip limits had been exceeded.
/// </para>
///
/// <para>
/// Set this property to <see cref="Zip64Option.Never"/> to tell the DotNetZip
/// library to never use ZIP64 extensions. This is useful for maximum
/// compatibility and interoperability, at the expense of the capability of
/// handling large files or large archives. NB: Windows Explorer in Windows XP
/// and Windows Vista cannot currently extract files from a zip64 archive, so if
/// you want to guarantee that a zip archive produced by this library will work in
/// Windows Explorer, use <c>Never</c>. If you set this property to <see
/// cref="Zip64Option.Never"/>, and your application creates a zip that would
/// exceed one of the Zip limits, the library will throw an exception while saving
/// the zip file.
/// </para>
///
/// <para>
/// Set this property to <see cref="Zip64Option.AsNecessary"/> to tell the
/// DotNetZip library to use the ZIP64 extensions when required by the
/// entry. After the file is compressed, the original and compressed sizes are
/// checked, and if they exceed the limits described above, then zip64 can be
/// used. That is the general idea, but there is an additional wrinkle when saving
/// to a non-seekable device, like the ASP.NET <c>Response.OutputStream</c>, or
/// <c>Console.Out</c>. When using non-seekable streams for output, the entry
/// header - which indicates whether zip64 is in use - is emitted before it is
/// known if zip64 is necessary. It is only after all entries have been saved
/// that it can be known if ZIP64 will be required. On seekable output streams,
/// after saving all entries, the library can seek backward and re-emit the zip
/// file header to be consistent with the actual ZIP64 requirement. But using a
/// non-seekable output stream, the library cannot seek backward, so the header
/// can never be changed. In other words, the archive's use of ZIP64 extensions is
/// not alterable after the header is emitted. Therefore, when saving to
/// non-seekable streams, using <see cref="Zip64Option.AsNecessary"/> is the same
/// as using <see cref="Zip64Option.Always"/>: it will always produce a zip
/// archive that uses ZIP64 extensions.
/// </para>
///
/// </remarks>
public enum Zip64Option
{
/// <summary>
/// The default behavior, which is "Never".
/// (For COM clients, this is a 0 (zero).)
/// </summary>
Default = 0,
/// <summary>
/// Do not use ZIP64 extensions when writing zip archives.
/// (For COM clients, this is a 0 (zero).)
/// </summary>
Never = 0,
/// <summary>
/// Use ZIP64 extensions when writing zip archives, as necessary.
/// For example, when a single entry exceeds 0xFFFFFFFF in size, or when the archive as a whole
/// exceeds 0xFFFFFFFF in size, or when there are more than 65535 entries in an archive.
/// (For COM clients, this is a 1.)
/// </summary>
AsNecessary = 1,
/// <summary>
/// Always use ZIP64 extensions when writing zip archives, even when unnecessary.
/// (For COM clients, this is a 2.)
/// </summary>
Always
}
/// <summary>
/// An enum representing the values on a three-way toggle switch
/// for various options in the library. This might be used to
/// specify whether to employ a particular text encoding, or to use
/// ZIP64 extensions, or some other option.
/// </summary>
public enum ZipOption
{
/// <summary>
/// The default behavior. This is the same as "Never".
/// (For COM clients, this is a 0 (zero).)
/// </summary>
Default = 0,
/// <summary>
/// Never use the associated option.
/// (For COM clients, this is a 0 (zero).)
/// </summary>
Never = 0,
/// <summary>
/// Use the associated behavior "as necessary."
/// (For COM clients, this is a 1.)
/// </summary>
AsNecessary = 1,
/// <summary>
/// Use the associated behavior Always, whether necessary or not.
/// (For COM clients, this is a 2.)
/// </summary>
Always
}
enum AddOrUpdateAction
{
AddOnly = 0,
AddOrUpdate
}
}
// ==================================================================
//
// Information on the ZIP format:
//
// From
// http://www.pkware.com/documents/casestudies/APPNOTE.TXT
//
// Overall .ZIP file format:
//
// [local file header 1]
// [file data 1]
// [data descriptor 1] ** sometimes
// .
// .
// .
// [local file header n]
// [file data n]
// [data descriptor n] ** sometimes
// [archive decryption header]
// [archive extra data record]
// [central directory]
// [zip64 end of central directory record]
// [zip64 end of central directory locator]
// [end of central directory record]
//
// Local File Header format:
// local file header signature ... 4 bytes (0x04034b50)
// version needed to extract ..... 2 bytes
// general purpose bit field ..... 2 bytes
// compression method ............ 2 bytes
// last mod file time ............ 2 bytes
// last mod file date............. 2 bytes
// crc-32 ........................ 4 bytes
// compressed size................ 4 bytes
// uncompressed size.............. 4 bytes
// file name length............... 2 bytes
// extra field length ............ 2 bytes
// file name varies
// extra field varies
//
//
// Data descriptor: (used only when bit 3 of the general purpose bitfield is set)
// (although, I have found zip files where bit 3 is not set, yet this descriptor is present!)
// local file header signature 4 bytes (0x08074b50) ** sometimes!!! Not always
// crc-32 4 bytes
// compressed size 4 bytes
// uncompressed size 4 bytes
//
//
// Central directory structure:
//
// [file header 1]
// .
// .
// .
// [file header n]
// [digital signature]
//
//
// File header: (This is a ZipDirEntry)
// central file header signature 4 bytes (0x02014b50)
// version made by 2 bytes
// version needed to extract 2 bytes
// general purpose bit flag 2 bytes
// compression method 2 bytes
// last mod file time 2 bytes
// last mod file date 2 bytes
// crc-32 4 bytes
// compressed size 4 bytes
// uncompressed size 4 bytes
// file name length 2 bytes
// extra field length 2 bytes
// file comment length 2 bytes
// disk number start 2 bytes
// internal file attributes ** 2 bytes
// external file attributes *** 4 bytes
// relative offset of local header 4 bytes
// file name (variable size)
// extra field (variable size)
// file comment (variable size)
//
// ** The internal file attributes, near as I can tell,
// uses 0x01 for a file and a 0x00 for a directory.
//
// ***The external file attributes follows the MS-DOS file attribute byte, described here:
// at http://support.microsoft.com/kb/q125019/
// 0x0010 => directory
// 0x0020 => file
//
//
// End of central directory record:
//
// end of central dir signature 4 bytes (0x06054b50)
// number of this disk 2 bytes
// number of the disk with the
// start of the central directory 2 bytes
// total number of entries in the
// central directory on this disk 2 bytes
// total number of entries in
// the central directory 2 bytes
// size of the central directory 4 bytes
// offset of start of central
// directory with respect to
// the starting disk number 4 bytes
// .ZIP file comment length 2 bytes
// .ZIP file comment (variable size)
//
// date and time are packed values, as MSDOS did them
// time: bits 0-4 : seconds (divided by 2)
// 5-10: minute
// 11-15: hour
// date bits 0-4 : day
// 5-8: month
// 9-15 year (since 1980)
//
// see http://msdn.microsoft.com/en-us/library/ms724274(VS.85).aspx
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