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// ZipEntry.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2006-2010 Dino Chiesa.
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// last saved (in emacs):
// Time-stamp: <2011-August-06 17:25:53>
//
// ------------------------------------------------------------------
//
// This module defines the ZipEntry class, which models the entries within a zip file.
//
// Created: Tue, 27 Mar 2007 15:30
//
// ------------------------------------------------------------------
using System;
using System.IO;
using Interop = System.Runtime.InteropServices;
namespace OfficeOpenXml.Packaging.Ionic.Zip
{
/// <summary>
/// Represents a single entry in a ZipFile. Typically, applications get a ZipEntry
/// by enumerating the entries within a ZipFile, or by adding an entry to a ZipFile.
/// </summary>
[Interop.GuidAttribute("ebc25cf6-9120-4283-b972-0e5520d00004")]
[Interop.ComVisible(true)]
#if !NETCF
[Interop.ClassInterface(Interop.ClassInterfaceType.AutoDispatch)] // AutoDual
#endif
internal partial class ZipEntry
{
/// <summary>
/// Default constructor.
/// </summary>
/// <remarks>
/// Applications should never need to call this directly. It is exposed to
/// support COM Automation environments.
/// </remarks>
public ZipEntry()
{
_CompressionMethod = (Int16)CompressionMethod.Deflate;
_CompressionLevel = Ionic.Zlib.CompressionLevel.Default;
_Encryption = EncryptionAlgorithm.None;
_Source = ZipEntrySource.None;
AlternateEncoding = System.Text.Encoding.ASCII;
AlternateEncodingUsage = ZipOption.Never;
}
/// <summary>
/// The time and date at which the file indicated by the <c>ZipEntry</c> was
/// last modified.
/// </summary>
///
/// <remarks>
/// <para>
/// The DotNetZip library sets the LastModified value for an entry, equal to
/// the Last Modified time of the file in the filesystem. If an entry is
/// added from a stream, the library uses <c>System.DateTime.Now</c> for this
/// value, for the given entry.
/// </para>
///
/// <para>
/// This property allows the application to retrieve and possibly set the
/// LastModified value on an entry, to an arbitrary value. <see
/// cref="System.DateTime"/> values with a <see cref="System.DateTimeKind" />
/// setting of <c>DateTimeKind.Unspecified</c> are taken to be expressed as
/// <c>DateTimeKind.Local</c>.
/// </para>
///
/// <para>
/// Be aware that because of the way <see
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">PKWare's
/// Zip specification</see> describes how times are stored in the zip file,
/// the full precision of the <c>System.DateTime</c> datatype is not stored
/// for the last modified time when saving zip files. For more information on
/// how times are formatted, see the PKZip specification.
/// </para>
///
/// <para>
/// The actual last modified time of a file can be stored in multiple ways in
/// the zip file, and they are not mutually exclusive:
/// </para>
///
/// <list type="bullet">
/// <item>
/// In the so-called "DOS" format, which has a 2-second precision. Values
/// are rounded to the nearest even second. For example, if the time on the
/// file is 12:34:43, then it will be stored as 12:34:44. This first value
/// is accessible via the <c>LastModified</c> property. This value is always
/// present in the metadata for each zip entry. In some cases the value is
/// invalid, or zero.
/// </item>
///
/// <item>
/// In the so-called "Windows" or "NTFS" format, as an 8-byte integer
/// quantity expressed as the number of 1/10 milliseconds (in other words
/// the number of 100 nanosecond units) since January 1, 1601 (UTC). This
/// format is how Windows represents file times. This time is accessible
/// via the <c>ModifiedTime</c> property.
/// </item>
///
/// <item>
/// In the "Unix" format, a 4-byte quantity specifying the number of seconds since
/// January 1, 1970 UTC.
/// </item>
///
/// <item>
/// In an older format, now deprecated but still used by some current
/// tools. This format is also a 4-byte quantity specifying the number of
/// seconds since January 1, 1970 UTC.
/// </item>
///
/// </list>
///
/// <para>
/// Zip tools and libraries will always at least handle (read or write) the
/// DOS time, and may also handle the other time formats. Keep in mind that
/// while the names refer to particular operating systems, there is nothing in
/// the time formats themselves that prevents their use on other operating
/// systems.
/// </para>
///
/// <para>
/// When reading ZIP files, the DotNetZip library reads the Windows-formatted
/// time, if it is stored in the entry, and sets both <c>LastModified</c> and
/// <c>ModifiedTime</c> to that value. When writing ZIP files, the DotNetZip
/// library by default will write both time quantities. It can also emit the
/// Unix-formatted time if desired (See <see
/// cref="EmitTimesInUnixFormatWhenSaving"/>.)
/// </para>
///
/// <para>
/// The last modified time of the file created upon a call to
/// <c>ZipEntry.Extract()</c> may be adjusted during extraction to compensate
/// for differences in how the .NET Base Class Library deals with daylight
/// saving time (DST) versus how the Windows filesystem deals with daylight
/// saving time. Raymond Chen <see
/// href="http://blogs.msdn.com/oldnewthing/archive/2003/10/24/55413.aspx">provides
/// some good context</see>.
/// </para>
///
/// <para>
/// In a nutshell: Daylight savings time rules change regularly. In 2007, for
/// example, the inception week of DST changed. In 1977, DST was in place all
/// year round. In 1945, likewise. And so on. Win32 does not attempt to
/// guess which time zone rules were in effect at the time in question. It
/// will render a time as "standard time" and allow the app to change to DST
/// as necessary. .NET makes a different choice.
/// </para>
///
/// <para>
/// Compare the output of FileInfo.LastWriteTime.ToString("f") with what you
/// see in the Windows Explorer property sheet for a file that was last
/// written to on the other side of the DST transition. For example, suppose
/// the file was last modified on October 17, 2003, during DST but DST is not
/// currently in effect. Explorer's file properties reports Thursday, October
/// 17, 2003, 8:45:38 AM, but .NETs FileInfo reports Thursday, October 17,
/// 2003, 9:45 AM.
/// </para>
///
/// <para>
/// Win32 says, "Thursday, October 17, 2002 8:45:38 AM PST". Note: Pacific
/// STANDARD Time. Even though October 17 of that year occurred during Pacific
/// Daylight Time, Win32 displays the time as standard time because that's
/// what time it is NOW.
/// </para>
///
/// <para>
/// .NET BCL assumes that the current DST rules were in place at the time in
/// question. So, .NET says, "Well, if the rules in effect now were also in
/// effect on October 17, 2003, then that would be daylight time" so it
/// displays "Thursday, October 17, 2003, 9:45 AM PDT" - daylight time.
/// </para>
///
/// <para>
/// So .NET gives a value which is more intuitively correct, but is also
/// potentially incorrect, and which is not invertible. Win32 gives a value
/// which is intuitively incorrect, but is strictly correct.
/// </para>
///
/// <para>
/// Because of this funkiness, this library adds one hour to the LastModified
/// time on the extracted file, if necessary. That is to say, if the time in
/// question had occurred in what the .NET Base Class Library assumed to be
/// DST. This assumption may be wrong given the constantly changing DST rules,
/// but it is the best we can do.
/// </para>
///
/// </remarks>
///
public DateTime LastModified
{
get { return _LastModified.ToLocalTime(); }
set
{
_LastModified = (value.Kind == DateTimeKind.Unspecified)
? DateTime.SpecifyKind(value, DateTimeKind.Local)
: value.ToLocalTime();
_Mtime = Ionic.Zip.SharedUtilities.AdjustTime_Reverse(_LastModified).ToUniversalTime();
_metadataChanged = true;
}
}
private int BufferSize
{
get
{
return this._container.BufferSize;
}
}
/// <summary>
/// Last Modified time for the file represented by the entry.
/// </summary>
///
/// <remarks>
///
/// <para>
/// This value corresponds to the "last modified" time in the NTFS file times
/// as described in <see
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">the Zip
/// specification</see>. When getting this property, the value may be
/// different from <see cref="LastModified" />. When setting the property,
/// the <see cref="LastModified"/> property also gets set, but with a lower
/// precision.
/// </para>
///
/// <para>
/// Let me explain. It's going to take a while, so get
/// comfortable. Originally, waaaaay back in 1989 when the ZIP specification
/// was originally described by the esteemed Mr. Phil Katz, the dominant
/// operating system of the time was MS-DOS. MSDOS stored file times with a
/// 2-second precision, because, c'mon, <em>who is ever going to need better
/// resolution than THAT?</em> And so ZIP files, regardless of the platform on
/// which the zip file was created, store file times in exactly <see
/// href="http://www.vsft.com/hal/dostime.htm">the same format that DOS used
/// in 1989</see>.
/// </para>
///
/// <para>
/// Since then, the ZIP spec has evolved, but the internal format for file
/// timestamps remains the same. Despite the fact that the way times are
/// stored in a zip file is rooted in DOS heritage, any program on any
/// operating system can format a time in this way, and most zip tools and
/// libraries DO - they round file times to the nearest even second and store
/// it just like DOS did 25+ years ago.
/// </para>
///
/// <para>
/// PKWare extended the ZIP specification to allow a zip file to store what
/// are called "NTFS Times" and "Unix(tm) times" for a file. These are the
/// <em>last write</em>, <em>last access</em>, and <em>file creation</em>
/// times of a particular file. These metadata are not actually specific
/// to NTFS or Unix. They are tracked for each file by NTFS and by various
/// Unix filesystems, but they are also tracked by other filesystems, too.
/// The key point is that the times are <em>formatted in the zip file</em>
/// in the same way that NTFS formats the time (ticks since win32 epoch),
/// or in the same way that Unix formats the time (seconds since Unix
/// epoch). As with the DOS time, any tool or library running on any
/// operating system is capable of formatting a time in one of these ways
/// and embedding it into the zip file.
/// </para>
///
/// <para>
/// These extended times are higher precision quantities than the DOS time.
/// As described above, the (DOS) LastModified has a precision of 2 seconds.
/// The Unix time is stored with a precision of 1 second. The NTFS time is
/// stored with a precision of 0.0000001 seconds. The quantities are easily
/// convertible, except for the loss of precision you may incur.
/// </para>
///
/// <para>
/// A zip archive can store the {C,A,M} times in NTFS format, in Unix format,
/// or not at all. Often a tool running on Unix or Mac will embed the times
/// in Unix format (1 second precision), while WinZip running on Windows might
/// embed the times in NTFS format (precision of of 0.0000001 seconds). When
/// reading a zip file with these "extended" times, in either format,
/// DotNetZip represents the values with the
/// <c>ModifiedTime</c>, <c>AccessedTime</c> and <c>CreationTime</c>
/// properties on the <c>ZipEntry</c>.
/// </para>
///
/// <para>
/// While any zip application or library, regardless of the platform it
/// runs on, could use any of the time formats allowed by the ZIP
/// specification, not all zip tools or libraries do support all these
/// formats. Storing the higher-precision times for each entry is
/// optional for zip files, and many tools and libraries don't use the
/// higher precision quantities at all. The old DOS time, represented by
/// <see cref="LastModified"/>, is guaranteed to be present, though it
/// sometimes unset.
/// </para>
///
/// <para>
/// Ok, getting back to the question about how the <c>LastModified</c>
/// property relates to this <c>ModifiedTime</c>
/// property... <c>LastModified</c> is always set, while
/// <c>ModifiedTime</c> is not. (The other times stored in the <em>NTFS
/// times extension</em>, <c>CreationTime</c> and <c>AccessedTime</c> also
/// may not be set on an entry that is read from an existing zip file.)
/// When reading a zip file, then <c>LastModified</c> takes the DOS time
/// that is stored with the file. If the DOS time has been stored as zero
/// in the zipfile, then this library will use <c>DateTime.Now</c> for the
/// <c>LastModified</c> value. If the ZIP file was created by an evolved
/// tool, then there will also be higher precision NTFS or Unix times in
/// the zip file. In that case, this library will read those times, and
/// set <c>LastModified</c> and <c>ModifiedTime</c> to the same value, the
/// one corresponding to the last write time of the file. If there are no
/// higher precision times stored for the entry, then <c>ModifiedTime</c>
/// remains unset (likewise <c>AccessedTime</c> and <c>CreationTime</c>),
/// and <c>LastModified</c> keeps its DOS time.
/// </para>
///
/// <para>
/// When creating zip files with this library, by default the extended time
/// properties (<c>ModifiedTime</c>, <c>AccessedTime</c>, and
/// <c>CreationTime</c>) are set on the ZipEntry instance, and these data are
/// stored in the zip archive for each entry, in NTFS format. If you add an
/// entry from an actual filesystem file, then the entry gets the actual file
/// times for that file, to NTFS-level precision. If you add an entry from a
/// stream, or a string, then the times get the value <c>DateTime.Now</c>. In
/// this case <c>LastModified</c> and <c>ModifiedTime</c> will be identical,
/// to 2 seconds of precision. You can explicitly set the
/// <c>CreationTime</c>, <c>AccessedTime</c>, and <c>ModifiedTime</c> of an
/// entry using the property setters. If you want to set all of those
/// quantities, it's more efficient to use the <see
/// cref="SetEntryTimes(DateTime, DateTime, DateTime)"/> method. Those
/// changes are not made permanent in the zip file until you call <see
/// cref="ZipFile.Save()"/> or one of its cousins.
/// </para>
///
/// <para>
/// When creating a zip file, you can override the default behavior of
/// this library for formatting times in the zip file, disabling the
/// embedding of file times in NTFS format or enabling the storage of file
/// times in Unix format, or both. You may want to do this, for example,
/// when creating a zip file on Windows, that will be consumed on a Mac,
/// by an application that is not hip to the "NTFS times" format. To do
/// this, use the <see cref="EmitTimesInWindowsFormatWhenSaving"/> and
/// <see cref="EmitTimesInUnixFormatWhenSaving"/> properties. A valid zip
/// file may store the file times in both formats. But, there are no
/// guarantees that a program running on Mac or Linux will gracefully
/// handle the NTFS-formatted times when Unix times are present, or that a
/// non-DotNetZip-powered application running on Windows will be able to
/// handle file times in Unix format. DotNetZip will always do something
/// reasonable; other libraries or tools may not. When in doubt, test.
/// </para>
///
/// <para>
/// I'll bet you didn't think one person could type so much about time, eh?
/// And reading it was so enjoyable, too! Well, in appreciation, <see
/// href="http://cheeso.members.winisp.net/DotNetZipDonate.aspx">maybe you
/// should donate</see>?
/// </para>
/// </remarks>
///
/// <seealso cref="AccessedTime"/>
/// <seealso cref="CreationTime"/>
/// <seealso cref="Ionic.Zip.ZipEntry.LastModified"/>
/// <seealso cref="SetEntryTimes"/>
public DateTime ModifiedTime
{
get { return _Mtime; }
set
{
SetEntryTimes(_Ctime, _Atime, value);
}
}
/// <summary>
/// Last Access time for the file represented by the entry.
/// </summary>
/// <remarks>
/// This value may or may not be meaningful. If the <c>ZipEntry</c> was read from an existing
/// Zip archive, this information may not be available. For an explanation of why, see
/// <see cref="ModifiedTime"/>.
/// </remarks>
/// <seealso cref="ModifiedTime"/>
/// <seealso cref="CreationTime"/>
/// <seealso cref="SetEntryTimes"/>
public DateTime AccessedTime
{
get { return _Atime; }
set
{
SetEntryTimes(_Ctime, value, _Mtime);
}
}
/// <summary>
/// The file creation time for the file represented by the entry.
/// </summary>
///
/// <remarks>
/// This value may or may not be meaningful. If the <c>ZipEntry</c> was read
/// from an existing zip archive, and the creation time was not set on the entry
/// when the zip file was created, then this property may be meaningless. For an
/// explanation of why, see <see cref="ModifiedTime"/>.
/// </remarks>
/// <seealso cref="ModifiedTime"/>
/// <seealso cref="AccessedTime"/>
/// <seealso cref="SetEntryTimes"/>
public DateTime CreationTime
{
get { return _Ctime; }
set
{
SetEntryTimes(value, _Atime, _Mtime);
}
}
/// <summary>
/// Sets the NTFS Creation, Access, and Modified times for the given entry.
/// </summary>
///
/// <remarks>
/// <para>
/// When adding an entry from a file or directory, the Creation, Access, and
/// Modified times for the given entry are automatically set from the
/// filesystem values. When adding an entry from a stream or string, the
/// values are implicitly set to DateTime.Now. The application may wish to
/// set these values to some arbitrary value, before saving the archive, and
/// can do so using the various setters. If you want to set all of the times,
/// this method is more efficient.
/// </para>
///
/// <para>
/// The values you set here will be retrievable with the <see
/// cref="ModifiedTime"/>, <see cref="CreationTime"/> and <see
/// cref="AccessedTime"/> properties.
/// </para>
///
/// <para>
/// When this method is called, if both <see
/// cref="EmitTimesInWindowsFormatWhenSaving"/> and <see
/// cref="EmitTimesInUnixFormatWhenSaving"/> are false, then the
/// <c>EmitTimesInWindowsFormatWhenSaving</c> flag is automatically set.
/// </para>
///
/// <para>
/// DateTime values provided here without a DateTimeKind are assumed to be Local Time.
/// </para>
///
/// </remarks>
/// <param name="created">the creation time of the entry.</param>
/// <param name="accessed">the last access time of the entry.</param>
/// <param name="modified">the last modified time of the entry.</param>
///
/// <seealso cref="EmitTimesInWindowsFormatWhenSaving" />
/// <seealso cref="EmitTimesInUnixFormatWhenSaving" />
/// <seealso cref="AccessedTime"/>
/// <seealso cref="CreationTime"/>
/// <seealso cref="ModifiedTime"/>
public void SetEntryTimes(DateTime created, DateTime accessed, DateTime modified)
{
_ntfsTimesAreSet = true;
if (created == _zeroHour && created.Kind == _zeroHour.Kind) created = _win32Epoch;
if (accessed == _zeroHour && accessed.Kind == _zeroHour.Kind) accessed = _win32Epoch;
if (modified == _zeroHour && modified.Kind == _zeroHour.Kind) modified = _win32Epoch;
_Ctime = created.ToUniversalTime();
_Atime = accessed.ToUniversalTime();
_Mtime = modified.ToUniversalTime();
_LastModified = _Mtime;
if (!_emitUnixTimes && !_emitNtfsTimes)
_emitNtfsTimes = true;
_metadataChanged = true;
}
/// <summary>
/// Specifies whether the Creation, Access, and Modified times for the given
/// entry will be emitted in "Windows 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 entry should or should not be stored
/// in the zip archive in the format used by Windows. The default value of
/// this property is <c>true</c>.
/// </para>
///
/// <para>
/// When adding an entry from a file or directory, the Creation (<see
/// cref="CreationTime"/>), Access (<see cref="AccessedTime"/>), and Modified
/// (<see cref="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="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 Jan 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.
/// </para>
///
/// <para>
/// Not all zip 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. Although the time values are
/// easily convertible, subject to a loss of precision, 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="ModifiedTime"/>, <see
/// cref="AccessedTime"/>, and <see cref="CreationTime"/>.
/// </para>
///
/// <para>
/// This property is not mutually exclusive from the <see
/// cref="ZipEntry.EmitTimesInUnixFormatWhenSaving"/> property. It is
/// possible that a zip entry can embed the timestamps in both forms, one
/// form, or neither. But, there are no guarantees that a program running on
/// Mac or Linux will gracefully handle NTFS Formatted times, or that a
/// non-DotNetZip-powered application running on Windows will be able to
/// handle file times in Unix format. When in doubt, test.
/// </para>
///
/// <para>
/// Normally you will use the <see
/// cref="ZipFile.EmitTimesInWindowsFormatWhenSaving">ZipFile.EmitTimesInWindowsFormatWhenSaving</see>
/// property, to specify the behavior for all entries in a zip, rather than
/// the property on each individual entry.
/// </para>
///
/// </remarks>
///
/// <seealso cref="SetEntryTimes(DateTime, DateTime, DateTime)"/>
/// <seealso cref="EmitTimesInUnixFormatWhenSaving"/>
/// <seealso cref="CreationTime"/>
/// <seealso cref="AccessedTime"/>
/// <seealso cref="ModifiedTime"/>
public bool EmitTimesInWindowsFormatWhenSaving
{
get
{
return _emitNtfsTimes;
}
set
{
_emitNtfsTimes = value;
_metadataChanged = true;
}
}
/// <summary>
/// Specifies whether the Creation, Access, and Modified times for the given
/// entry will be emitted in &quot;Unix(tm) format&quot; 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 entry 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="CreationTime"/>), Access (<see cref="AccessedTime"/>), and Modified
/// (<see cref="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="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 Jan 1, 1601 UTC. The other is a format Unix applications typically
/// use: seconds since Jan 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.
/// </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. Although the time values are
/// easily convertible, subject to a loss of precision, 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="ModifiedTime"/>, <see
/// cref="AccessedTime"/>, and <see cref="CreationTime"/>.
/// </para>
///
/// <para>
/// This property is not mutually exclusive from the <see
/// cref="ZipEntry.EmitTimesInWindowsFormatWhenSaving"/> property. It is
/// possible that a zip entry can embed the timestamps in both forms, one
/// form, or neither. But, there are no guarantees that a program running on
/// Mac or Linux will gracefully handle NTFS Formatted times, or that a
/// non-DotNetZip-powered application running on Windows will be able to
/// handle file times in Unix format. When in doubt, test.
/// </para>
///
/// <para>
/// Normally you will use the <see
/// cref="ZipFile.EmitTimesInUnixFormatWhenSaving">ZipFile.EmitTimesInUnixFormatWhenSaving</see>
/// property, to specify the behavior for all entries, rather than the
/// property on each individual entry.
/// </para>
/// </remarks>
///
/// <seealso cref="SetEntryTimes(DateTime, DateTime, DateTime)"/>
/// <seealso cref="EmitTimesInWindowsFormatWhenSaving"/>
/// <seealso cref="ZipFile.EmitTimesInUnixFormatWhenSaving"/>
/// <seealso cref="CreationTime"/>
/// <seealso cref="AccessedTime"/>
/// <seealso cref="ModifiedTime"/>
public bool EmitTimesInUnixFormatWhenSaving
{
get
{
return _emitUnixTimes;
}
set
{
_emitUnixTimes = value;
_metadataChanged = true;
}
}
/// <summary>
/// The type of timestamp attached to the ZipEntry.
/// </summary>
///
/// <remarks>
/// This property is valid only for a ZipEntry that was read from a zip archive.
/// It indicates the type of timestamp attached to the entry.
/// </remarks>
///
/// <seealso cref="EmitTimesInWindowsFormatWhenSaving"/>
/// <seealso cref="EmitTimesInUnixFormatWhenSaving"/>
internal ZipEntryTimestamp Timestamp
{
get
{
return _timestamp;
}
}
/// <summary>
/// The file attributes for the entry.
/// </summary>
///
/// <remarks>
///
/// <para>
/// The <see cref="System.IO.FileAttributes">attributes</see> in NTFS include
/// ReadOnly, Archive, Hidden, System, and Indexed. When adding a
/// <c>ZipEntry</c> to a ZipFile, these attributes are set implicitly when
/// adding an entry from the filesystem. When adding an entry from a stream
/// or string, the Attributes are not set implicitly. Regardless of the way
/// an entry was added to a <c>ZipFile</c>, you can set the attributes
/// explicitly if you like.
/// </para>
///
/// <para>
/// When reading a <c>ZipEntry</c> from a <c>ZipFile</c>, the attributes are
/// set according to the data stored in the <c>ZipFile</c>. If you extract the
/// entry from the archive to a filesystem file, DotNetZip will set the
/// attributes on the resulting file accordingly.
/// </para>
///
/// <para>
/// The attributes can be set explicitly by the application. For example the
/// application may wish to set the <c>FileAttributes.ReadOnly</c> bit for all
/// entries added to an archive, so that on unpack, this attribute will be set
/// on the extracted file. Any changes you make to this property are made
/// permanent only when you call a <c>Save()</c> method on the <c>ZipFile</c>
/// instance that contains the ZipEntry.
/// </para>
///
/// <para>
/// For example, an application may wish to zip up a directory and set the
/// ReadOnly bit on every file in the archive, so that upon later extraction,
/// the resulting files will be marked as ReadOnly. Not every extraction tool
/// respects these attributes, but if you unpack with DotNetZip, as for
/// example in a self-extracting archive, then the attributes will be set as
/// they are stored in the <c>ZipFile</c>.
/// </para>
///
/// <para>
/// These attributes may not be interesting or useful if the resulting archive
/// is extracted on a non-Windows platform. How these attributes get used
/// upon extraction depends on the platform and tool used.
/// </para>
///
/// <para>
/// This property is only partially supported in the Silverlight version
/// of the library: applications can read attributes on entries within
/// ZipFiles. But extracting entries within Silverlight will not set the
/// attributes on the extracted files.
/// </para>
///
/// </remarks>
public System.IO.FileAttributes Attributes
{
// workitem 7071
get { return (System.IO.FileAttributes)_ExternalFileAttrs; }
set
{
_ExternalFileAttrs = (int)value;
// Since the application is explicitly setting the attributes, overwriting
// whatever was there, we will explicitly set the Version made by field.
// workitem 7926 - "version made by" OS should be zero for compat with WinZip
_VersionMadeBy = (0 << 8) + 45; // v4.5 of the spec
_metadataChanged = true;
}
}
/// <summary>
/// The name of the filesystem file, referred to by the ZipEntry.
/// </summary>
///
/// <remarks>
/// <para>
/// This property specifies the thing-to-be-zipped on disk, and is set only
/// when the <c>ZipEntry</c> is being created from a filesystem file. If the
/// <c>ZipFile</c> is instantiated by reading an existing .zip archive, then
/// the LocalFileName will be <c>null</c> (<c>Nothing</c> in VB).
/// </para>
///
/// <para>
/// When it is set, the value of this property may be different than <see
/// cref="FileName"/>, which is the path used in the archive itself. If you
/// call <c>Zip.AddFile("foop.txt", AlternativeDirectory)</c>, then the path
/// used for the <c>ZipEntry</c> within the zip archive will be different
/// than this path.
/// </para>
///
/// <para>
/// If the entry is being added from a stream, then this is null (Nothing in VB).
/// </para>
///
/// </remarks>
/// <seealso cref="FileName"/>
internal string LocalFileName
{
get { return _LocalFileName; }
}
/// <summary>
/// The name of the file contained in the ZipEntry.
/// </summary>
///
/// <remarks>
///
/// <para>
/// This is the name of the entry in the <c>ZipFile</c> itself. When creating
/// a zip archive, if the <c>ZipEntry</c> has been created from a filesystem
/// file, via a call to <see cref="ZipFile.AddFile(String,String)"/> or <see
/// cref="ZipFile.AddItem(String,String)"/>, or a related overload, the value
/// of this property is derived from the name of that file. The
/// <c>FileName</c> property does not include drive letters, and may include a
/// different directory path, depending on the value of the
/// <c>directoryPathInArchive</c> parameter used when adding the entry into
/// the <c>ZipFile</c>.
/// </para>
///
/// <para>
/// In some cases there is no related filesystem file - for example when a
/// <c>ZipEntry</c> is created using <see cref="ZipFile.AddEntry(string,
/// string)"/> or one of the similar overloads. In this case, the value of
/// this property is derived from the fileName and the directory path passed
/// to that method.
/// </para>
///
/// <para>
/// When reading a zip file, this property takes the value of the entry name
/// as stored in the zip file. If you extract such an entry, the extracted
/// file will take the name given by this property.
/// </para>
///
/// <para>
/// Applications can set this property when creating new zip archives or when
/// reading existing archives. When setting this property, the actual value
/// that is set will replace backslashes with forward slashes, in accordance
/// with <see
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">the Zip
/// specification</see>, for compatibility with Unix(tm) and ... get
/// this.... Amiga!
/// </para>
///
/// <para>
/// If an application reads a <c>ZipFile</c> via <see
/// cref="ZipFile.Read(String)"/> or a related overload, and then explicitly
/// sets the FileName on an entry contained within the <c>ZipFile</c>, and
/// then calls <see cref="ZipFile.Save()"/>, the application will effectively
/// rename the entry within the zip archive.
/// </para>
///
/// <para>
/// If an application sets the value of <c>FileName</c>, then calls
/// <c>Extract()</c> on the entry, the entry is extracted to a file using the
/// newly set value as the filename. The <c>FileName</c> value is made
/// permanent in the zip archive only <em>after</em> a call to one of the
/// <c>ZipFile.Save()</c> methods on the <c>ZipFile</c> that contains the
/// ZipEntry.
/// </para>
///
/// <para>
/// If an application attempts to set the <c>FileName</c> to a value that
/// would result in a duplicate entry in the <c>ZipFile</c>, an exception is
/// thrown.
/// </para>
///
/// <para>
/// When a <c>ZipEntry</c> is contained within a <c>ZipFile</c>, applications
/// cannot rename the entry within the context of a <c>foreach</c> (<c>For
/// Each</c> in VB) loop, because of the way the <c>ZipFile</c> stores
/// entries. If you need to enumerate through all the entries and rename one
/// or more of them, use <see
/// cref="ZipFile.EntriesSorted">ZipFile.EntriesSorted</see> as the
/// collection. See also, <see
/// cref="ZipFile.GetEnumerator()">ZipFile.GetEnumerator()</see>.
/// </para>
///
/// </remarks>
public string FileName
{
get { return _FileNameInArchive; }
set
{
if (_container.ZipFile == null)
throw new ZipException("Cannot rename; this is not supported in ZipOutputStream/ZipInputStream.");
// rename the entry!
if (String.IsNullOrEmpty(value)) throw new ZipException("The FileName must be non empty and non-null.");
var filename = ZipEntry.NameInArchive(value, null);
// workitem 8180
if (_FileNameInArchive == filename) return; // nothing to do
// workitem 8047 - when renaming, must remove old and then add a new entry
this._container.ZipFile.RemoveEntry(this);
this._container.ZipFile.InternalAddEntry(filename, this);
_FileNameInArchive = filename;
_container.ZipFile.NotifyEntryChanged();
_metadataChanged = true;
}
}
/// <summary>
/// The stream that provides content for the ZipEntry.
/// </summary>
///
/// <remarks>
///
/// <para>
/// The application can use this property to set the input stream for an
/// entry on a just-in-time basis. Imagine a scenario where the application
/// creates a <c>ZipFile</c> comprised of content obtained from hundreds of
/// files, via calls to <c>AddFile()</c>. The DotNetZip library opens streams
/// on these files on a just-in-time basis, only when writing the entry out to
/// an external store within the scope of a <c>ZipFile.Save()</c> call. Only
/// one input stream is opened at a time, as each entry is being written out.
/// </para>
///
/// <para>
/// Now imagine a different application that creates a <c>ZipFile</c>
/// with content obtained from hundreds of streams, added through <see
/// cref="ZipFile.AddEntry(string, System.IO.Stream)"/>. Normally the
/// application would supply an open stream to that call. But when large
/// numbers of streams are being added, this can mean many open streams at one
/// time, unnecessarily.
/// </para>
///
/// <para>
/// To avoid this, call <see cref="ZipFile.AddEntry(String, OpenDelegate,
/// CloseDelegate)"/> and specify delegates that open and close the stream at
/// the time of Save.
/// </para>
///
///
/// <para>
/// Setting the value of this property when the entry was not added from a
/// stream (for example, when the <c>ZipEntry</c> was added with <see
/// cref="ZipFile.AddFile(String)"/> or <see
/// cref="ZipFile.AddDirectory(String)"/>, or when the entry was added by
/// reading an existing zip archive) will throw an exception.
/// </para>
///
/// </remarks>
///
public Stream InputStream
{
get { return _sourceStream; }
set
{
if (this._Source != ZipEntrySource.Stream)
throw new ZipException("You must not set the input stream for this entry.");
_sourceWasJitProvided = true;
_sourceStream = value;
}
}
/// <summary>
/// A flag indicating whether the InputStream was provided Just-in-time.
/// </summary>
///
/// <remarks>
///
/// <para>
/// When creating a zip archive, an application can obtain content for one or
/// more of the <c>ZipEntry</c> instances from streams, using the <see
/// cref="ZipFile.AddEntry(string, System.IO.Stream)"/> method. At the time
/// of calling that method, the application can supply null as the value of
/// the stream parameter. By doing so, the application indicates to the
/// library that it will provide a stream for the entry on a just-in-time
/// basis, at the time one of the <c>ZipFile.Save()</c> methods is called and
/// the data for the various entries are being compressed and written out.
/// </para>
///
/// <para>
/// In this case, the application can set the <see cref="InputStream"/>
/// property, typically within the SaveProgress event (event type: <see
/// cref="ZipProgressEventType.Saving_BeforeWriteEntry"/>) for that entry.
/// </para>
///
/// <para>
/// The application will later want to call Close() and Dispose() on that
/// stream. In the SaveProgress event, when the event type is <see
/// cref="ZipProgressEventType.Saving_AfterWriteEntry"/>, the application can
/// do so. This flag indicates that the stream has been provided by the
/// application on a just-in-time basis and that it is the application's
/// responsibility to call Close/Dispose on that stream.
/// </para>
///
/// </remarks>
/// <seealso cref="InputStream"/>
public bool InputStreamWasJitProvided
{
get { return _sourceWasJitProvided; }
}
/// <summary>
/// An enum indicating the source of the ZipEntry.
/// </summary>
internal ZipEntrySource Source
{
get { return _Source; }
}
/// <summary>
/// The version of the zip engine needed to read the ZipEntry.
/// </summary>
///
/// <remarks>
/// <para>
/// This is a readonly property, indicating the version of <a
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">the Zip
/// specification</a> that the extracting tool or library must support to
/// extract the given entry. Generally higher versions indicate newer
/// features. Older zip engines obviously won't know about new features, and
/// won't be able to extract entries that depend on those newer features.
/// </para>
///
/// <list type="table">
/// <listheader>
/// <term>value</term>
/// <description>Features</description>
/// </listheader>
///
/// <item>
/// <term>20</term>
/// <description>a basic Zip Entry, potentially using PKZIP encryption.
/// </description>
/// </item>
///
/// <item>
/// <term>45</term>
/// <description>The ZIP64 extension is used on the entry.
/// </description>
/// </item>
///
/// <item>
/// <term>46</term>
/// <description> File is compressed using BZIP2 compression*</description>
/// </item>
///
/// <item>
/// <term>50</term>
/// <description> File is encrypted using PkWare's DES, 3DES, (broken) RC2 or RC4</description>
/// </item>
///
/// <item>
/// <term>51</term>
/// <description> File is encrypted using PKWare's AES encryption or corrected RC2 encryption.</description>
/// </item>
///
/// <item>
/// <term>52</term>
/// <description> File is encrypted using corrected RC2-64 encryption**</description>
/// </item>
///
/// <item>
/// <term>61</term>
/// <description> File is encrypted using non-OAEP key wrapping***</description>
/// </item>
///
/// <item>
/// <term>63</term>
/// <description> File is compressed using LZMA, PPMd+, Blowfish, or Twofish</description>
/// </item>
///
/// </list>
///
/// <para>
/// There are other values possible, not listed here. DotNetZip supports
/// regular PKZip encryption, and ZIP64 extensions. DotNetZip cannot extract
/// entries that require a zip engine higher than 45.
/// </para>
///
/// <para>
/// This value is set upon reading an existing zip file, or after saving a zip
/// archive.
/// </para>
/// </remarks>
public Int16 VersionNeeded
{
get { return _VersionNeeded; }
}
/// <summary>
/// The comment attached to the ZipEntry.
/// </summary>
///
/// <remarks>
/// <para>
/// Each entry in a zip file can optionally have a comment associated to
/// it. The comment might be displayed by a zip tool during extraction, for
/// example.
/// </para>
///
/// <para>
/// By default, the <c>Comment</c> is encoded in IBM437 code page. You can
/// specify an alternative with <see cref="AlternateEncoding"/> and
/// <see cref="AlternateEncodingUsage"/>.
/// </para>
/// </remarks>
/// <seealso cref="AlternateEncoding"/>
/// <seealso cref="AlternateEncodingUsage"/>
public string Comment
{
get { return _Comment; }
set
{
_Comment = value;
_metadataChanged = true;
}
}
/// <summary>
/// Indicates whether the entry requires ZIP64 extensions.
/// </summary>
///
/// <remarks>
///
/// <para>
/// This property is null (Nothing in VB) until a <c>Save()</c> method on the
/// containing <see cref="ZipFile"/> instance has been called. The property is
/// non-null (<c>HasValue</c> is true) only after a <c>Save()</c> method has
/// been called.
/// </para>
///
/// <para>
/// After the containing <c>ZipFile</c> has been saved, the Value of this
/// property is true if any of the following three conditions holds: the
/// uncompressed size of the entry is larger than 0xFFFFFFFF; the compressed
/// size of the entry is larger than 0xFFFFFFFF; the relative offset of the
/// entry within the zip archive is larger than 0xFFFFFFFF. These quantities
/// are not known until a <c>Save()</c> is attempted on the zip archive and
/// the compression is applied.
/// </para>
///
/// <para>
/// If none of the three conditions holds, then the <c>Value</c> is false.
/// </para>
///
/// <para>
/// A <c>Value</c> of false does not indicate that the entry, as saved in the
/// zip archive, does not use ZIP64. It merely indicates that ZIP64 is
/// <em>not required</em>. An entry may use ZIP64 even when not required if
/// the <see cref="ZipFile.UseZip64WhenSaving"/> property on the containing
/// <c>ZipFile</c> instance is set to <see cref="Zip64Option.Always"/>, or if
/// the <see cref="ZipFile.UseZip64WhenSaving"/> property on the containing
/// <c>ZipFile</c> instance is set to <see cref="Zip64Option.AsNecessary"/>
/// and the output stream was not seekable.
/// </para>
///
/// </remarks>
/// <seealso cref="OutputUsedZip64"/>
public Nullable<bool> RequiresZip64
{
get
{
return _entryRequiresZip64;
}
}
/// <summary>
/// Indicates whether the entry actually used ZIP64 extensions, as it was most
/// recently written to the output file or stream.
/// </summary>
///
/// <remarks>
///
/// <para>
/// This Nullable property is null (Nothing in VB) until a <c>Save()</c>
/// method on the containing <see cref="ZipFile"/> instance has been
/// called. <c>HasValue</c> is true only after a <c>Save()</c> method has been
/// called.
/// </para>
///
/// <para>
/// The value of this property for a particular <c>ZipEntry</c> may change
/// over successive calls to <c>Save()</c> methods on the containing ZipFile,
/// even if the file that corresponds to the <c>ZipEntry</c> does not. This
/// may happen if other entries contained in the <c>ZipFile</c> expand,
/// causing the offset for this particular entry to exceed 0xFFFFFFFF.
/// </para>
/// </remarks>
/// <seealso cref="RequiresZip64"/>
public Nullable<bool> OutputUsedZip64
{
get { return _OutputUsesZip64; }
}
/// <summary>
/// The bitfield for the entry as defined in the zip spec. You probably
/// never need to look at this.
/// </summary>
///
/// <remarks>
/// <para>
/// You probably do not need to concern yourself with the contents of this
/// property, but in case you do:
/// </para>
///
/// <list type="table">
/// <listheader>
/// <term>bit</term>
/// <description>meaning</description>
/// </listheader>
///
/// <item>
/// <term>0</term>
/// <description>set if encryption is used.</description>
/// </item>
///
/// <item>
/// <term>1-2</term>
/// <description>
/// set to determine whether normal, max, fast deflation. DotNetZip library
/// always leaves these bits unset when writing (indicating "normal"
/// deflation"), but can read an entry with any value here.
/// </description>
/// </item>
///
/// <item>
/// <term>3</term>
/// <description>
/// Indicates that the Crc32, Compressed and Uncompressed sizes are zero in the
/// local header. This bit gets set on an entry during writing a zip file, when
/// it is saved to a non-seekable output stream.
/// </description>
/// </item>
///
///
/// <item>
/// <term>4</term>
/// <description>reserved for "enhanced deflating". This library doesn't do enhanced deflating.</description>
/// </item>
///
/// <item>
/// <term>5</term>
/// <description>set to indicate the zip is compressed patched data. This library doesn't do that.</description>
/// </item>
///
/// <item>
/// <term>6</term>
/// <description>
/// set if PKWare's strong encryption is used (must also set bit 1 if bit 6 is
/// set). This bit is not set if WinZip's AES encryption is set.</description>
/// </item>
///
/// <item>
/// <term>7</term>
/// <description>not used</description>
/// </item>
///
/// <item>
/// <term>8</term>
/// <description>not used</description>
/// </item>
///
/// <item>
/// <term>9</term>
/// <description>not used</description>
/// </item>
///
/// <item>
/// <term>10</term>
/// <description>not used</description>
/// </item>
///
/// <item>
/// <term>11</term>
/// <description>
/// Language encoding flag (EFS). If this bit is set, the filename and comment
/// fields for this file must be encoded using UTF-8. This library currently
/// does not support UTF-8.
/// </description>
/// </item>
///
/// <item>
/// <term>12</term>
/// <description>Reserved by PKWARE for enhanced compression.</description>
/// </item>
///
/// <item>
/// <term>13</term>
/// <description>
/// Used when encrypting the Central Directory to indicate selected data
/// values in the Local Header are masked to hide their actual values. See
/// the section in <a
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">the Zip
/// specification</a> describing the Strong Encryption Specification for
/// details.
/// </description>
/// </item>
///
/// <item>
/// <term>14</term>
/// <description>Reserved by PKWARE.</description>
/// </item>
///
/// <item>
/// <term>15</term>
/// <description>Reserved by PKWARE.</description>
/// </item>
///
/// </list>
///
/// </remarks>
public Int16 BitField
{
get { return _BitField; }
}
/// <summary>
/// The compression method employed for this ZipEntry.
/// </summary>
///
/// <remarks>
///
/// <para>
/// <see href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">The
/// Zip specification</see> allows a variety of compression methods. This
/// library supports just two: 0x08 = Deflate. 0x00 = Store (no compression),
/// for reading or writing.
/// </para>
///
/// <para>
/// When reading an entry from an existing zipfile, the value you retrieve
/// here indicates the compression method used on the entry by the original
/// creator of the zip. When writing a zipfile, you can specify either 0x08
/// (Deflate) or 0x00 (None). If you try setting something else, you will get
/// an exception.
/// </para>
///
/// <para>
/// You may wish to set <c>CompressionMethod</c> to <c>CompressionMethod.None</c> (0)
/// when zipping already-compressed data like a jpg, png, or mp3 file.
/// This can save time and cpu cycles.
/// </para>
///
/// <para>
/// When setting this property on a <c>ZipEntry</c> that is read from an
/// existing zip file, calling <c>ZipFile.Save()</c> will cause the new
/// CompressionMethod to be used on the entry in the newly saved zip file.
/// </para>
///
/// <para>
/// Setting this property may have the side effect of modifying the
/// <c>CompressionLevel</c> property. If you set the <c>CompressionMethod</c> to a
/// value other than <c>None</c>, and <c>CompressionLevel</c> is previously
/// set to <c>None</c>, then <c>CompressionLevel</c> will be set to
/// <c>Default</c>.
/// </para>
/// </remarks>
///
/// <seealso cref="CompressionMethod"/>
///
/// <example>
/// In this example, the first entry added to the zip archive uses the default
/// behavior - compression is used where it makes sense. The second entry,
/// the MP3 file, is added to the archive without being compressed.
/// <code>
/// using (ZipFile zip = new ZipFile(ZipFileToCreate))
/// {
/// ZipEntry e1= zip.AddFile(@"notes\Readme.txt");
/// ZipEntry e2= zip.AddFile(@"music\StopThisTrain.mp3");
/// e2.CompressionMethod = CompressionMethod.None;
/// zip.Save();
/// }
/// </code>
///
/// <code lang="VB">
/// Using zip As New ZipFile(ZipFileToCreate)
/// zip.AddFile("notes\Readme.txt")
/// Dim e2 as ZipEntry = zip.AddFile("music\StopThisTrain.mp3")
/// e2.CompressionMethod = CompressionMethod.None
/// zip.Save
/// End Using
/// </code>
/// </example>
internal CompressionMethod CompressionMethod
{
get { return (CompressionMethod)_CompressionMethod; }
set
{
if (value == (CompressionMethod)_CompressionMethod) return; // nothing to do.
if (value != CompressionMethod.None && value != CompressionMethod.Deflate
#if BZIP
&& value != CompressionMethod.BZip2
#endif
)
throw new InvalidOperationException("Unsupported compression method.");
// If the source is a zip archive and there was encryption on the
// entry, changing the compression method is not supported.
// if (this._Source == ZipEntrySource.ZipFile && _sourceIsEncrypted)
// throw new InvalidOperationException("Cannot change compression method on encrypted entries read from archives.");
_CompressionMethod = (Int16)value;
if (_CompressionMethod == (Int16)Ionic.Zip.CompressionMethod.None)
_CompressionLevel = Ionic.Zlib.CompressionLevel.None;
else if (CompressionLevel == Ionic.Zlib.CompressionLevel.None)
_CompressionLevel = Ionic.Zlib.CompressionLevel.Default;
if (_container.ZipFile != null) _container.ZipFile.NotifyEntryChanged();
_restreamRequiredOnSave = true;
}
}
/// <summary>
/// Sets the compression level to be used for the entry when saving the zip
/// archive. This applies only for CompressionMethod = DEFLATE.
/// </summary>
///
/// <remarks>
/// <para>
/// When using the DEFLATE compression method, Varying the compression
/// level used on entries can affect the size-vs-speed tradeoff when
/// compression and decompressing data streams or files.
/// </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>
///
/// <para>
/// When setting this property on a <c>ZipEntry</c> that is read from an
/// existing zip file, calling <c>ZipFile.Save()</c> will cause the new
/// <c>CompressionLevel</c> to be used on the entry in the newly saved zip file.
/// </para>
///
/// <para>
/// Setting this property may have the side effect of modifying the
/// <c>CompressionMethod</c> property. If you set the <c>CompressionLevel</c>
/// to a value other than <c>None</c>, <c>CompressionMethod</c> will be set
/// to <c>Deflate</c>, if it was previously <c>None</c>.
/// </para>
///
/// <para>
/// Setting this property has no effect if the <c>CompressionMethod</c> is something
/// other than <c>Deflate</c> or <c>None</c>.
/// </para>
/// </remarks>
///
/// <seealso cref="CompressionMethod"/>
public OfficeOpenXml.Packaging.Ionic.Zlib.CompressionLevel CompressionLevel
{
get
{
return _CompressionLevel;
}
set
{
if (_CompressionMethod != (short)CompressionMethod.Deflate &&
_CompressionMethod != (short)CompressionMethod.None)
return ; // no effect
if (value == OfficeOpenXml.Packaging.Ionic.Zlib.CompressionLevel.Default &&
_CompressionMethod == (short)CompressionMethod.Deflate) return; // nothing to do
_CompressionLevel = value;
if (value == OfficeOpenXml.Packaging.Ionic.Zlib.CompressionLevel.None &&
_CompressionMethod == (short)CompressionMethod.None)
return; // nothing more to do
if (_CompressionLevel == OfficeOpenXml.Packaging.Ionic.Zlib.CompressionLevel.None)
_CompressionMethod = (short)OfficeOpenXml.Packaging.Ionic.Zip.CompressionMethod.None;
else
_CompressionMethod = (short)OfficeOpenXml.Packaging.Ionic.Zip.CompressionMethod.Deflate;
if (_container.ZipFile != null) _container.ZipFile.NotifyEntryChanged();
_restreamRequiredOnSave = true;
}
}
/// <summary>
/// The compressed size of the file, in bytes, within the zip archive.
/// </summary>
///
/// <remarks>
/// When reading a <c>ZipFile</c>, this value is read in from the existing
/// zip file. When creating or updating a <c>ZipFile</c>, the compressed
/// size is computed during compression. Therefore the value on a
/// <c>ZipEntry</c> is valid after a call to <c>Save()</c> (or one of its
/// overloads) in that case.
/// </remarks>
///
/// <seealso cref="ZipEntry.UncompressedSize"/>
public Int64 CompressedSize
{
get { return _CompressedSize; }
}
/// <summary>
/// The size of the file, in bytes, before compression, or after extraction.
/// </summary>
///
/// <remarks>
/// When reading a <c>ZipFile</c>, this value is read in from the existing
/// zip file. When creating or updating a <c>ZipFile</c>, the uncompressed
/// size is computed during compression. Therefore the value on a
/// <c>ZipEntry</c> is valid after a call to <c>Save()</c> (or one of its
/// overloads) in that case.
/// </remarks>
///
/// <seealso cref="Ionic.Zip.ZipEntry.CompressedSize"/>
public Int64 UncompressedSize
{
get { return _UncompressedSize; }
}
/// <summary>
/// The ratio of compressed size to uncompressed size of the ZipEntry.
/// </summary>
///
/// <remarks>
/// <para>
/// This is a ratio of the compressed size to the uncompressed size of the
/// entry, expressed as a double in the range of 0 to 100+. A value of 100
/// indicates no compression at all. It could be higher than 100 when the
/// compression algorithm actually inflates the data, as may occur for small
/// files, or uncompressible data that is encrypted.
/// </para>
///
/// <para>
/// You could format it for presentation to a user via a format string of
/// "{3,5:F0}%" to see it as a percentage.
/// </para>
///
/// <para>
/// If the size of the original uncompressed file is 0, implying a
/// denominator of 0, the return value will be zero.
/// </para>
///
/// <para>
/// This property is valid after reading in an existing zip file, or after
/// saving the <c>ZipFile</c> that contains the ZipEntry. You cannot know the
/// effect of a compression transform until you try it.
/// </para>
///
/// </remarks>
public Double CompressionRatio
{
get
{
if (UncompressedSize == 0) return 0;
return 100 * (1.0 - (1.0 * CompressedSize) / (1.0 * UncompressedSize));
}
}
/// <summary>
/// The 32-bit CRC (Cyclic Redundancy Check) on the contents of the ZipEntry.
/// </summary>
///
/// <remarks>
///
/// <para> You probably don't need to concern yourself with this. It is used
/// internally by DotNetZip to verify files or streams upon extraction. </para>
///
/// <para> The value is a <see href="http://en.wikipedia.org/wiki/CRC32">32-bit
/// CRC</see> using 0xEDB88320 for the polynomial. This is the same CRC-32 used in
/// PNG, MPEG-2, and other protocols and formats. It is a read-only property; when
/// creating a Zip archive, the CRC for each entry is set only after a call to
/// <c>Save()</c> on the containing ZipFile. When reading an existing zip file, the value
/// of this property reflects the stored CRC for the entry. </para>
///
/// </remarks>
public Int32 Crc
{
get { return _Crc32; }
}
/// <summary>
/// True if the entry is a directory (not a file).
/// This is a readonly property on the entry.
/// </summary>
public bool IsDirectory
{
get { return _IsDirectory; }
}
/// <summary>
/// A derived property that is <c>true</c> if the entry uses encryption.
/// </summary>
///
/// <remarks>
/// <para>
/// This is a readonly property on the entry. When reading a zip file,
/// the value for the <c>ZipEntry</c> is determined by the data read
/// from the zip file. After saving a ZipFile, the value of this
/// property for each <c>ZipEntry</c> indicates whether encryption was
/// actually used (which will have been true if the <see
/// cref="Password"/> was set and the <see cref="Encryption"/> property
/// was something other than <see cref="EncryptionAlgorithm.None"/>.
/// </para>
/// </remarks>
public bool UsesEncryption
{
get { return (_Encryption_FromZipFile != EncryptionAlgorithm.None); }
}
/// <summary>
/// Set this to specify which encryption algorithm to use for the entry when
/// saving it to a zip archive.
/// </summary>
///
/// <remarks>
///
/// <para>
/// Set this property in order to encrypt the entry when the <c>ZipFile</c> is
/// saved. When setting this property, you must also set a <see
/// cref="Password"/> on the entry. If you set a value other than <see
/// cref="EncryptionAlgorithm.None"/> on this property and do not set a
/// <c>Password</c> then the entry will not be encrypted. The <c>ZipEntry</c>
/// data is encrypted as the <c>ZipFile</c> is saved, when you call <see
/// cref="ZipFile.Save()"/> or one of its cousins on the containing
/// <c>ZipFile</c> instance. You do not need to specify the <c>Encryption</c>
/// when extracting entries from an archive.
/// </para>
///
/// <para>
/// The Zip specification from PKWare defines a set of encryption algorithms,
/// and the data formats for the zip archive that support them, and PKWare
/// supports those algorithms in the tools it produces. Other vendors of tools
/// and libraries, such as WinZip or Xceed, typically support <em>a
/// subset</em> of the algorithms specified by PKWare. These tools can
/// sometimes support additional different encryption algorithms and data
/// formats, not specified by PKWare. The AES Encryption specified and
/// supported by WinZip is the most popular example. This library supports a
/// subset of the complete set of algorithms specified by PKWare and other
/// vendors.
/// </para>
///
/// <para>
/// There is no common, ubiquitous multi-vendor standard for strong encryption
/// within zip files. There is broad support for so-called "traditional" Zip
/// encryption, sometimes called Zip 2.0 encryption, as <see
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">specified
/// by PKWare</see>, but this encryption is considered weak and
/// breakable. This library currently supports the Zip 2.0 "weak" encryption,
/// and also a stronger WinZip-compatible AES encryption, using either 128-bit
/// or 256-bit key strength. If you want DotNetZip to support an algorithm
/// that is not currently supported, call the author of this library and maybe
/// we can talk business.
/// </para>
///
/// <para>
/// The <see cref="ZipFile"/> class also has a <see
/// cref="ZipFile.Encryption"/> property. In most cases you will use
/// <em>that</em> property when setting encryption. This property takes
/// precedence over any <c>Encryption</c> set on the <c>ZipFile</c> itself.
/// Typically, you would use the per-entry Encryption when most entries in the
/// zip archive use one encryption algorithm, and a few entries use a
/// different one. If all entries in the zip file use the same Encryption,
/// then it is simpler to just set this property on the ZipFile itself, when
/// creating a zip archive.
/// </para>
///
/// <para>
/// Some comments on updating archives: If you read a <c>ZipFile</c>, you can
/// modify the Encryption on an encrypted entry: you can remove encryption
/// from an entry that was encrypted; you can encrypt an entry that was not
/// encrypted previously; or, you can change the encryption algorithm. The
/// changes in encryption are not made permanent until you call Save() on the
/// <c>ZipFile</c>. To effect changes in encryption, the entry content is
/// streamed through several transformations, depending on the modification
/// the application has requested. For example if the entry is not encrypted
/// and the application sets <c>Encryption</c> to <c>PkzipWeak</c>, then at
/// the time of <c>Save()</c>, the original entry is read and decompressed,
/// then re-compressed and encrypted. Conversely, if the original entry is
/// encrypted with <c>PkzipWeak</c> encryption, and the application sets the
/// <c>Encryption</c> property to <c>WinZipAes128</c>, then at the time of
/// <c>Save()</c>, the original entry is decrypted via PKZIP encryption and
/// decompressed, then re-compressed and re-encrypted with AES. This all
/// happens automatically within the library, but it can be time-consuming for
/// large entries.
/// </para>
///
/// <para>
/// Additionally, when updating archives, it is not possible to change the
/// password when changing the encryption algorithm. To change both the
/// algorithm and the password, you need to Save() the zipfile twice. First
/// set the <c>Encryption</c> to None, then call <c>Save()</c>. Then set the
/// <c>Encryption</c> to the new value (not "None"), then call <c>Save()</c>
/// once again.
/// </para>
///
/// <para>
/// The WinZip AES encryption algorithms are not supported on the .NET Compact
/// Framework.
/// </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 file
/// uses encryption.
/// </para>
/// <code>
/// // Create a zip archive with AES Encryption.
/// using (ZipFile zip = new ZipFile())
/// {
/// zip.AddFile("ReadMe.txt")
/// ZipEntry e1= zip.AddFile("2008-Regional-Sales-Report.pdf");
/// e1.Encryption= EncryptionAlgorithm.WinZipAes256;
/// e1.Password= "Top.Secret.No.Peeking!";
/// 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"))
/// {
/// // Specify the password that is used during extraction, for
/// // all entries that require a password:
/// 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.AddFile("ReadMe.txt")
/// Dim e1 as ZipEntry
/// e1= zip.AddFile("2008-Regional-Sales-Report.pdf")
/// e1.Encryption= EncryptionAlgorithm.WinZipAes256
/// e1.Password= "Top.Secret.No.Peeking!"
/// 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"))
/// ' Specify the password that is used during extraction, for
/// ' all entries that require a password:
/// zip.Password= "Top.Secret.No.Peeking!"
/// zip.ExtractAll("extractDirectory")
/// End Using
/// </code>
///
/// </example>
///
/// <exception cref="System.InvalidOperationException">
/// Thrown in the setter if EncryptionAlgorithm.Unsupported is specified.
/// </exception>
///
/// <seealso cref="Ionic.Zip.ZipEntry.Password">ZipEntry.Password</seealso>
/// <seealso cref="Ionic.Zip.ZipFile.Encryption">ZipFile.Encryption</seealso>
internal EncryptionAlgorithm Encryption
{
get
{
return _Encryption;
}
set
{
if (value == _Encryption) return; // no change
if (value == EncryptionAlgorithm.Unsupported)
throw new InvalidOperationException("You may not set Encryption to that value.");
// If the source is a zip archive and there was encryption
// on the entry, this will not work. <XXX>
//if (this._Source == ZipEntrySource.ZipFile && _sourceIsEncrypted)
// throw new InvalidOperationException("You cannot change the encryption method on encrypted entries read from archives.");
_Encryption = value;
_restreamRequiredOnSave = true;
if (_container.ZipFile!=null)
_container.ZipFile.NotifyEntryChanged();
}
}
/// <summary>
/// The Password to be used when encrypting a <c>ZipEntry</c> upon
/// <c>ZipFile.Save()</c>, or when decrypting an entry upon Extract().
/// </summary>
///
/// <remarks>
/// <para>
/// This is a write-only property on the entry. Set this to request that the
/// entry be encrypted when writing the zip archive, or set it to specify the
/// password to be used when extracting an existing entry that is encrypted.
/// </para>
///
/// <para>
/// The password set here is implicitly used to encrypt the entry during the
/// <see cref="ZipFile.Save()"/> operation, or to decrypt during the <see
/// cref="Extract()"/> or <see cref="OpenReader()"/> operation. If you set
/// the Password on a <c>ZipEntry</c> after calling <c>Save()</c>, there is no
/// effect.
/// </para>
///
/// <para>
/// Consider setting the <see cref="Encryption"/> property when using a
/// password. Answering concerns that the standard password protection
/// supported by all zip tools is weak, WinZip has extended the ZIP
/// specification with a way to use AES Encryption to protect entries in the
/// Zip file. Unlike the "PKZIP 2.0" encryption specified in the PKZIP
/// specification, <see href=
/// "http://en.wikipedia.org/wiki/Advanced_Encryption_Standard">AES
/// Encryption</see> uses a standard, strong, tested, encryption
/// algorithm. DotNetZip can create zip archives that use WinZip-compatible
/// AES encryption, if you set the <see cref="Encryption"/> property. But,
/// archives created that use AES encryption may not be readable by all other
/// tools and libraries. For example, Windows Explorer cannot read a
/// "compressed folder" (a zip file) that uses AES encryption, though it can
/// read a zip file that uses "PKZIP encryption."
/// </para>
///
/// <para>
/// The <see cref="ZipFile"/> class also has a <see cref="ZipFile.Password"/>
/// property. This property takes precedence over any password set on the
/// ZipFile itself. 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 ZipFile itself,
/// whether creating a zip archive or extracting a zip archive.
/// </para>
///
/// <para>
/// Some comments on updating archives: If you read a <c>ZipFile</c>, you
/// cannot modify the password on any encrypted entry, except by extracting
/// the entry with the original password (if any), removing the original entry
/// via <see cref="ZipFile.RemoveEntry(ZipEntry)"/>, and then adding a new
/// entry with a new Password.
/// </para>
///
/// <para>
/// For example, suppose you read a <c>ZipFile</c>, and there is an encrypted
/// entry. Setting the Password property on that <c>ZipEntry</c> and then
/// calling <c>Save()</c> on the <c>ZipFile</c> does not update the password
/// on that entry in the archive. Neither is an exception thrown. Instead,
/// what happens during the <c>Save()</c> is the existing entry is copied
/// through to the new zip archive, in its original encrypted form. Upon
/// re-reading that archive, the entry can be decrypted with its original
/// password.
/// </para>
///
/// <para>
/// If you read a ZipFile, and there is an un-encrypted entry, you can set the
/// <c>Password</c> on the entry and then call Save() on the ZipFile, and get
/// encryption on that entry.
/// </para>
///
/// </remarks>
///
/// <example>
/// <para>
/// This example creates a zip file with two entries, and then extracts the
/// entries from the zip file. When creating the zip file, the two files are
/// added to the zip file using password protection. Each entry uses a
/// different password. During extraction, each file is extracted with the
/// appropriate password.
/// </para>
/// <code>
/// // create a file with encryption
/// using (ZipFile zip = new ZipFile())
/// {
/// ZipEntry entry;
/// entry= zip.AddFile("Declaration.txt");
/// entry.Password= "123456!";
/// entry = zip.AddFile("Report.xls");
/// entry.Password= "1Secret!";
/// zip.Save("EncryptedArchive.zip");
/// }
///
/// // extract entries that use encryption
/// using (ZipFile zip = ZipFile.Read("EncryptedArchive.zip"))
/// {
/// ZipEntry entry;
/// entry = zip["Declaration.txt"];
/// entry.Password = "123456!";
/// entry.Extract("extractDir");
/// entry = zip["Report.xls"];
/// entry.Password = "1Secret!";
/// entry.Extract("extractDir");
/// }
///
/// </code>
///
/// <code lang="VB">
/// Using zip As New ZipFile
/// Dim entry as ZipEntry
/// entry= zip.AddFile("Declaration.txt")
/// entry.Password= "123456!"
/// entry = zip.AddFile("Report.xls")
/// entry.Password= "1Secret!"
/// zip.Save("EncryptedArchive.zip")
/// End Using
///
///
/// ' extract entries that use encryption
/// Using (zip as ZipFile = ZipFile.Read("EncryptedArchive.zip"))
/// Dim entry as ZipEntry
/// entry = zip("Declaration.txt")
/// entry.Password = "123456!"
/// entry.Extract("extractDir")
/// entry = zip("Report.xls")
/// entry.Password = "1Secret!"
/// entry.Extract("extractDir")
/// End Using
///
/// </code>
///
/// </example>
///
/// <seealso cref="Ionic.Zip.ZipEntry.Encryption"/>
/// <seealso cref="Ionic.Zip.ZipFile.Password">ZipFile.Password</seealso>
public string Password
{
set
{
_Password = value;
if (_Password == null)
{
_Encryption = EncryptionAlgorithm.None;
}
else
{
// We're setting a non-null password.
// For entries obtained from a zip file that are encrypted, we cannot
// simply restream (recompress, re-encrypt) the file data, because we
// need the old password in order to decrypt the data, and then we
// need the new password to encrypt. So, setting the password is
// never going to work on an entry that is stored encrypted in a zipfile.
// But it is not en error to set the password, obviously: callers will
// set the password in order to Extract encrypted archives.
// If the source is a zip archive and there was previously no encryption
// on the entry, then we must re-stream the entry in order to encrypt it.
if (this._Source == ZipEntrySource.ZipFile && !_sourceIsEncrypted)
_restreamRequiredOnSave = true;
if (Encryption == EncryptionAlgorithm.None)
{
_Encryption = EncryptionAlgorithm.PkzipWeak;
}
}
}
private get { return _Password; }
}
internal bool IsChanged
{
get
{
return _restreamRequiredOnSave | _metadataChanged;
}
}
/// <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.ZipFile.ExtractExistingFile"/>
///
/// <example>
/// This example shows how to set the <c>ExtractExistingFile</c> property in
/// an <c>ExtractProgress</c> event, in response to user input. The
/// <c>ExtractProgress</c> event is invoked if and only if the
/// <c>ExtractExistingFile</c> property was previously set to
/// <c>ExtractExistingFileAction.InvokeExtractProgressEvent</c>.
/// <code lang="C#">
/// public static void ExtractProgress(object sender, ExtractProgressEventArgs e)
/// {
/// if (e.EventType == ZipProgressEventType.Extracting_BeforeExtractEntry)
/// Console.WriteLine("extract {0} ", e.CurrentEntry.FileName);
///
/// else if (e.EventType == ZipProgressEventType.Extracting_ExtractEntryWouldOverwrite)
/// {
/// ZipEntry entry = e.CurrentEntry;
/// string response = null;
/// // Ask the user if he wants overwrite the file
/// do
/// {
/// Console.Write("Overwrite {0} in {1} ? (y/n/C) ", entry.FileName, e.ExtractLocation);
/// response = Console.ReadLine();
/// Console.WriteLine();
///
/// } while (response != null &amp;&amp; response[0]!='Y' &amp;&amp;
/// response[0]!='N' &amp;&amp; response[0]!='C');
///
/// if (response[0]=='C')
/// e.Cancel = true;
/// else if (response[0]=='Y')
/// entry.ExtractExistingFile = ExtractExistingFileAction.OverwriteSilently;
/// else
/// entry.ExtractExistingFile= ExtractExistingFileAction.DoNotOverwrite;
/// }
/// }
/// </code>
/// </example>
internal ExtractExistingFileAction ExtractExistingFile
{
get;
set;
}
/// <summary>
/// The action to 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 within a call to <see
/// cref="ZipFile.Save()">ZipFile.Save</see>, as the various files contained
/// in a ZipFile are being saved into the zip archive. During the
/// <c>Save</c>, DotNetZip will perform a <c>File.Open</c> on the file
/// associated to the ZipEntry, and then will read the entire contents of
/// the file as it is zipped. Either the open or the Read may fail, because
/// of lock conflicts or other reasons. Using this property, you can
/// specify the action to take when such errors occur.
/// </para>
///
/// <para>
/// Typically you will NOT set this property on individual ZipEntry
/// instances. Instead, you will set the <see
/// cref="ZipFile.ZipErrorAction">ZipFile.ZipErrorAction</see> property on
/// the ZipFile instance, before adding any entries to the
/// <c>ZipFile</c>. If you do this, errors encountered on behalf of any of
/// the entries in the ZipFile will be handled the same way.
/// </para>
///
/// <para>
/// But, if you use a <see cref="ZipFile.ZipError"/> handler, you will want
/// to set this property on the <c>ZipEntry</c> within the handler, to
/// communicate back to DotNetZip what you would like to do with the
/// particular error.
/// </para>
///
/// </remarks>
/// <seealso cref="Ionic.Zip.ZipFile.ZipErrorAction"/>
/// <seealso cref="Ionic.Zip.ZipFile.ZipError"/>
internal ZipErrorAction ZipErrorAction
{
get;
set;
}
/// <summary>
/// Indicates whether the entry was included in the most recent save.
/// </summary>
/// <remarks>
/// An entry can be excluded or skipped from a save if there is an error
/// opening or reading the entry.
/// </remarks>
/// <seealso cref="ZipErrorAction"/>
internal bool IncludedInMostRecentSave
{
get
{
return !_skippedDuringSave;
}
}
/// <summary>
/// A callback that allows the application to specify the compression to use
/// for a given entry that is about to be added to the zip archive.
/// </summary>
///
/// <remarks>
/// <para>
/// See <see cref="ZipFile.SetCompression" />
/// </para>
/// </remarks>
public SetCompressionCallback SetCompression
{
get;
set;
}
/// <summary>
/// Set to indicate whether to use UTF-8 encoding for filenames and comments.
/// </summary>
///
/// <remarks>
///
/// <para>
/// If this flag is set, the comment and filename for the entry will be
/// encoded with UTF-8, as described in <see
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">the Zip
/// specification</see>, if necessary. "Necessary" means, the filename or
/// entry comment (if any) cannot be reflexively encoded and decoded using the
/// default code page, IBM437.
/// </para>
///
/// <para>
/// Setting this flag to true is equivalent to setting <see
/// cref="ProvisionalAlternateEncoding"/> to <c>System.Text.Encoding.UTF8</c>.
/// </para>
///
/// <para>
/// This flag has no effect or relation to the text encoding used within the
/// file itself.
/// </para>
///
/// </remarks>
[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>
/// The text encoding to use for the FileName and Comment on this ZipEntry,
/// when the default encoding is insufficient.
/// </summary>
///
/// <remarks>
///
/// <para>
/// Don't use this property. See <see cref='AlternateEncoding'/>.
/// </para>
///
/// </remarks>
[Obsolete("This property is obsolete since v1.9.1.6. Use AlternateEncoding and AlternateEncodingUsage instead.", true)]
public System.Text.Encoding ProvisionalAlternateEncoding
{
get; set;
}
/// <summary>
/// Specifies the alternate text encoding used by this ZipEntry
/// </summary>
/// <remarks>
/// <para>
/// The default text encoding used in Zip files for encoding filenames and
/// comments is IBM437, which is something like a superset of ASCII. In
/// cases where this is insufficient, applications can specify an
/// alternate encoding.
/// </para>
/// <para>
/// When creating a zip file, the usage of the alternate encoding is
/// governed by the <see cref="AlternateEncodingUsage"/> property.
/// Typically you would set both properties to tell DotNetZip to employ an
/// encoding that is not IBM437 in the zipfile you are creating.
/// </para>
/// <para>
/// Keep in mind that because the ZIP specification states that the only
/// valid encodings to use are IBM437 and UTF-8, if you use something
/// other than that, then zip tools and libraries may not be able to
/// successfully read the zip archive you generate.
/// </para>
/// <para>
/// The zip specification states that applications should presume that
/// IBM437 is in use, except when a special bit is set, which indicates
/// UTF-8. There is no way to specify an arbitrary code page, within the
/// zip file itself. When you create a zip file encoded with gb2312 or
/// ibm861 or anything other than IBM437 or UTF-8, then the application
/// that reads the zip file needs to "know" which code page to use. In
/// some cases, the code page used when reading is chosen implicitly. For
/// example, WinRar uses the ambient code page for the host desktop
/// operating system. The pitfall here is that if you create a zip in
/// Copenhagen and send it to Tokyo, the reader of the zipfile may not be
/// able to decode successfully.
/// </para>
/// </remarks>
/// <example>
/// This example shows how to create a zipfile encoded with a
/// language-specific encoding:
/// <code>
/// using (var zip = new ZipFile())
/// {
/// zip.AlternateEnoding = System.Text.Encoding.GetEncoding("ibm861");
/// zip.AlternateEnodingUsage = ZipOption.Always;
/// zip.AddFileS(arrayOfFiles);
/// zip.Save("Myarchive-Encoded-in-IBM861.zip");
/// }
/// </code>
/// </example>
/// <seealso cref="ZipFile.AlternateEncodingUsage" />
public System.Text.Encoding AlternateEncoding
{
get; set;
}
/// <summary>
/// Describes if and when this instance should apply
/// AlternateEncoding to encode the FileName and Comment, when
/// saving.
/// </summary>
/// <seealso cref="ZipFile.AlternateEncoding" />
internal ZipOption AlternateEncodingUsage
{
get; set;
}
// /// <summary>
// /// The text encoding actually used for this ZipEntry.
// /// </summary>
// ///
// /// <remarks>
// ///
// /// <para>
// /// This read-only property describes the encoding used by the
// /// <c>ZipEntry</c>. If the entry has been read in from an existing ZipFile,
// /// then it may take the value UTF-8, if the entry is coded to specify UTF-8.
// /// If the entry does not specify UTF-8, the typical case, then the encoding
// /// used is whatever the application specified in the call to
// /// <c>ZipFile.Read()</c>. If the application has used one of the overloads of
// /// <c>ZipFile.Read()</c> that does not accept an encoding parameter, then the
// /// encoding used is IBM437, which is the default encoding described in the
// /// ZIP specification. </para>
// ///
// /// <para>
// /// If the entry is being created, then the value of ActualEncoding is taken
// /// according to the logic described in the documentation for <see
// /// cref="ZipFile.ProvisionalAlternateEncoding" />. </para>
// ///
// /// <para>
// /// An application might be interested in retrieving this property to see if
// /// an entry read in from a file has used Unicode (UTF-8). </para>
// ///
// /// </remarks>
// ///
// /// <seealso cref="ZipFile.ProvisionalAlternateEncoding" />
// public System.Text.Encoding ActualEncoding
// {
// get
// {
// return _actualEncoding;
// }
// }
internal static string NameInArchive(String filename, string directoryPathInArchive)
{
string result = null;
if (directoryPathInArchive == null)
result = filename;
else
{
if (String.IsNullOrEmpty(directoryPathInArchive))
{
result = Path.GetFileName(filename);
}
else
{
// explicitly specify a pathname for this file
result = Path.Combine(directoryPathInArchive, Path.GetFileName(filename));
}
}
//result = Path.GetFullPath(result);
result = SharedUtilities.NormalizePathForUseInZipFile(result);
return result;
}
// workitem 9073
internal static ZipEntry CreateFromNothing(String nameInArchive)
{
return Create(nameInArchive, ZipEntrySource.None, null, null);
}
internal static ZipEntry CreateFromFile(String filename, string nameInArchive)
{
return Create(nameInArchive, ZipEntrySource.FileSystem, filename, null);
}
internal static ZipEntry CreateForStream(String entryName, Stream s)
{
return Create(entryName, ZipEntrySource.Stream, s, null);
}
internal static ZipEntry CreateForWriter(String entryName, WriteDelegate d)
{
return Create(entryName, ZipEntrySource.WriteDelegate, d, null);
}
internal static ZipEntry CreateForJitStreamProvider(string nameInArchive, OpenDelegate opener, CloseDelegate closer)
{
return Create(nameInArchive, ZipEntrySource.JitStream, opener, closer);
}
internal static ZipEntry CreateForZipOutputStream(string nameInArchive)
{
return Create(nameInArchive, ZipEntrySource.ZipOutputStream, null, null);
}
private static ZipEntry Create(string nameInArchive, ZipEntrySource source, Object arg1, Object arg2)
{
if (String.IsNullOrEmpty(nameInArchive))
throw new Ionic.Zip.ZipException("The entry name must be non-null and non-empty.");
ZipEntry entry = new ZipEntry();
// workitem 7071
// workitem 7926 - "version made by" OS should be zero for compat with WinZip
entry._VersionMadeBy = (0 << 8) + 45; // indicates the attributes are FAT Attributes, and v4.5 of the spec
entry._Source = source;
entry._Mtime = entry._Atime = entry._Ctime = DateTime.UtcNow;
if (source == ZipEntrySource.Stream)
{
entry._sourceStream = (arg1 as Stream); // may or may not be null
}
else if (source == ZipEntrySource.WriteDelegate)
{
entry._WriteDelegate = (arg1 as WriteDelegate); // may or may not be null
}
else if (source == ZipEntrySource.JitStream)
{
entry._OpenDelegate = (arg1 as OpenDelegate); // may or may not be null
entry._CloseDelegate = (arg2 as CloseDelegate); // may or may not be null
}
else if (source == ZipEntrySource.ZipOutputStream)
{
}
// workitem 9073
else if (source == ZipEntrySource.None)
{
// make this a valid value, for later.
entry._Source = ZipEntrySource.FileSystem;
}
else
{
String filename = (arg1 as String); // must not be null
if (String.IsNullOrEmpty(filename))
throw new Ionic.Zip.ZipException("The filename must be non-null and non-empty.");
try
{
// The named file may or may not exist at this time. For
// example, when adding a directory by name. We test existence
// when necessary: when saving the ZipFile, or when getting the
// attributes, and so on.
#if NETCF
// workitem 6878
// Ionic.Zip.SharedUtilities.AdjustTime_Win32ToDotNet
entry._Mtime = File.GetLastWriteTime(filename).ToUniversalTime();
entry._Ctime = File.GetCreationTime(filename).ToUniversalTime();
entry._Atime = File.GetLastAccessTime(filename).ToUniversalTime();
// workitem 7071
// can only get attributes of files that exist.
if (File.Exists(filename) || Directory.Exists(filename))
entry._ExternalFileAttrs = (int)NetCfFile.GetAttributes(filename);
#elif SILVERLIGHT
entry._Mtime =
entry._Ctime =
entry._Atime = System.DateTime.UtcNow;
entry._ExternalFileAttrs = (int)0;
#else
// workitem 6878??
entry._Mtime = File.GetLastWriteTime(filename).ToUniversalTime();
entry._Ctime = File.GetCreationTime(filename).ToUniversalTime();
entry._Atime = File.GetLastAccessTime(filename).ToUniversalTime();
// workitem 7071
// can only get attributes on files that exist.
if (File.Exists(filename) || Directory.Exists(filename))
entry._ExternalFileAttrs = (int)File.GetAttributes(filename);
#endif
entry._ntfsTimesAreSet = true;
entry._LocalFileName = Path.GetFullPath(filename); // workitem 8813
}
catch (System.IO.PathTooLongException ptle)
{
// workitem 14035
var msg = String.Format("The path is too long, filename={0}",
filename);
throw new ZipException(msg, ptle);
}
}
entry._LastModified = entry._Mtime;
entry._FileNameInArchive = SharedUtilities.NormalizePathForUseInZipFile(nameInArchive);
// We don't actually slurp in the file data until the caller invokes Write on this entry.
return entry;
}
internal void MarkAsDirectory()
{
_IsDirectory = true;
// workitem 6279
if (!_FileNameInArchive.EndsWith("/"))
_FileNameInArchive += "/";
}
/// <summary>
/// Indicates whether an entry is marked as a text file. Be careful when
/// using on this property. Unless you have a good reason, you should
/// probably ignore this property.
/// </summary>
///
/// <remarks>
/// <para>
/// The ZIP format includes a provision for specifying whether an entry in
/// the zip archive is a text or binary file. This property exposes that
/// metadata item. Be careful when using this property: It's not clear
/// that this property as a firm meaning, across tools and libraries.
/// </para>
///
/// <para>
/// To be clear, when reading a zip file, the property value may or may
/// not be set, and its value may or may not be valid. Not all entries
/// that you may think of as "text" entries will be so marked, and entries
/// marked as "text" are not guaranteed in any way to be text entries.
/// Whether the value is set and set correctly depends entirely on the
/// application that produced the zip file.
/// </para>
///
/// <para>
/// There are many zip tools available, and when creating zip files, some
/// of them "respect" the IsText metadata field, and some of them do not.
/// Unfortunately, even when an application tries to do "the right thing",
/// it's not always clear what "the right thing" is.
/// </para>
///
/// <para>
/// There's no firm definition of just what it means to be "a text file",
/// and the zip specification does not help in this regard. Twenty years
/// ago, text was ASCII, each byte was less than 127. IsText meant, all
/// bytes in the file were less than 127. These days, it is not the case
/// that all text files have all bytes less than 127. Any unicode file
/// may have bytes that are above 0x7f. The zip specification has nothing
/// to say on this topic. Therefore, it's not clear what IsText really
/// means.
/// </para>
///
/// <para>
/// This property merely tells a reading application what is stored in the
/// metadata for an entry, without guaranteeing its validity or its
/// meaning.
/// </para>
///
/// <para>
/// When DotNetZip is used to create a zipfile, it attempts to set this
/// field "correctly." For example, if a file ends in ".txt", this field
/// will be set. Your application may override that default setting. When
/// writing a zip file, you must set the property before calling
/// <c>Save()</c> on the ZipFile.
/// </para>
///
/// <para>
/// When reading a zip file, a more general way to decide just what kind
/// of file is contained in a particular entry is to use the file type
/// database stored in the operating system. The operating system stores
/// a table that says, a file with .jpg extension is a JPG image file, a
/// file with a .xml extension is an XML document, a file with a .txt is a
/// pure ASCII text document, and so on. To get this information on
/// Windows, <see
/// href="http://www.codeproject.com/KB/cs/GetFileTypeAndIcon.aspx"> you
/// need to read and parse the registry.</see> </para>
/// </remarks>
///
/// <example>
/// <code>
/// using (var zip = new ZipFile())
/// {
/// var e = zip.UpdateFile("Descriptions.mme", "");
/// e.IsText = true;
/// zip.Save(zipPath);
/// }
/// </code>
///
/// <code lang="VB">
/// Using zip As New ZipFile
/// Dim e2 as ZipEntry = zip.AddFile("Descriptions.mme", "")
/// e.IsText= True
/// zip.Save(zipPath)
/// End Using
/// </code>
/// </example>
public bool IsText
{
// workitem 7801
get { return _IsText; }
set { _IsText = value; }
}
/// <summary>Provides a string representation of the instance.</summary>
/// <returns>a string representation of the instance.</returns>
public override String ToString()
{
return String.Format("ZipEntry::{0}", FileName);
}
internal Stream ArchiveStream
{
get
{
if (_archiveStream == null)
{
if (_container.ZipFile != null)
{
var zf = _container.ZipFile;
zf.Reset(false);
_archiveStream = zf.StreamForDiskNumber(_diskNumber);
}
else
{
_archiveStream = _container.ZipOutputStream.OutputStream;
}
}
return _archiveStream;
}
}
private void SetFdpLoh()
{
// The value for FileDataPosition has not yet been set.
// Therefore, seek to the local header, and figure the start of file data.
// workitem 8098: ok (restore)
long origPosition = this.ArchiveStream.Position;
try
{
this.ArchiveStream.Seek(this._RelativeOffsetOfLocalHeader, SeekOrigin.Begin);
// workitem 10178
Ionic.Zip.SharedUtilities.Workaround_Ladybug318918(this.ArchiveStream);
}
catch (System.IO.IOException exc1)
{
string description = String.Format("Exception seeking entry({0}) offset(0x{1:X8}) len(0x{2:X8})",
this.FileName, this._RelativeOffsetOfLocalHeader,
this.ArchiveStream.Length);
throw new BadStateException(description, exc1);
}
byte[] block = new byte[30];
this.ArchiveStream.Read(block, 0, block.Length);
// At this point we could verify the contents read from the local header
// with the contents read from the central header. We could, but don't need to.
// So we won't.
Int16 filenameLength = (short)(block[26] + block[27] * 256);
Int16 extraFieldLength = (short)(block[28] + block[29] * 256);
// Console.WriteLine(" pos 0x{0:X8} ({0})", this.ArchiveStream.Position);
// Console.WriteLine(" seek 0x{0:X8} ({0})", filenameLength + extraFieldLength);
this.ArchiveStream.Seek(filenameLength + extraFieldLength, SeekOrigin.Current);
// workitem 10178
Ionic.Zip.SharedUtilities.Workaround_Ladybug318918(this.ArchiveStream);
this._LengthOfHeader = 30 + extraFieldLength + filenameLength +
GetLengthOfCryptoHeaderBytes(_Encryption_FromZipFile);
// Console.WriteLine(" ROLH 0x{0:X8} ({0})", _RelativeOffsetOfLocalHeader);
// Console.WriteLine(" LOH 0x{0:X8} ({0})", _LengthOfHeader);
// workitem 8098: ok (arithmetic)
this.__FileDataPosition = _RelativeOffsetOfLocalHeader + _LengthOfHeader;
// Console.WriteLine(" FDP 0x{0:X8} ({0})", __FileDataPosition);
// restore file position:
// workitem 8098: ok (restore)
this.ArchiveStream.Seek(origPosition, SeekOrigin.Begin);
// workitem 10178
Ionic.Zip.SharedUtilities.Workaround_Ladybug318918(this.ArchiveStream);
}
#if AESCRYPTO
private static int GetKeyStrengthInBits(EncryptionAlgorithm a)
{
if (a == EncryptionAlgorithm.WinZipAes256) return 256;
else if (a == EncryptionAlgorithm.WinZipAes128) return 128;
return -1;
}
#endif
internal static int GetLengthOfCryptoHeaderBytes(EncryptionAlgorithm a)
{
//if ((_BitField & 0x01) != 0x01) return 0;
if (a == EncryptionAlgorithm.None) return 0;
#if AESCRYPTO
if (a == EncryptionAlgorithm.WinZipAes128 ||
a == EncryptionAlgorithm.WinZipAes256)
{
int KeyStrengthInBits = GetKeyStrengthInBits(a);
int sizeOfSaltAndPv = ((KeyStrengthInBits / 8 / 2) + 2);
return sizeOfSaltAndPv;
}
#endif
if (a == EncryptionAlgorithm.PkzipWeak)
return 12;
throw new ZipException("internal error");
}
internal long FileDataPosition
{
get
{
if (__FileDataPosition == -1)
SetFdpLoh();
return __FileDataPosition;
}
}
private int LengthOfHeader
{
get
{
if (_LengthOfHeader == 0)
SetFdpLoh();
return _LengthOfHeader;
}
}
private ZipCrypto _zipCrypto_forExtract;
private ZipCrypto _zipCrypto_forWrite;
#if AESCRYPTO
private WinZipAesCrypto _aesCrypto_forExtract;
private WinZipAesCrypto _aesCrypto_forWrite;
private Int16 _WinZipAesMethod;
#endif
internal DateTime _LastModified;
private DateTime _Mtime, _Atime, _Ctime; // workitem 6878: NTFS quantities
private bool _ntfsTimesAreSet;
private bool _emitNtfsTimes = true;
private bool _emitUnixTimes; // by default, false
private bool _TrimVolumeFromFullyQualifiedPaths = true; // by default, trim them.
internal string _LocalFileName;
private string _FileNameInArchive;
internal Int16 _VersionNeeded;
internal Int16 _BitField;
internal Int16 _CompressionMethod;
private Int16 _CompressionMethod_FromZipFile;
private Ionic.Zlib.CompressionLevel _CompressionLevel;
internal string _Comment;
private bool _IsDirectory;
private byte[] _CommentBytes;
internal Int64 _CompressedSize;
internal Int64 _CompressedFileDataSize; // CompressedSize less 12 bytes for the encryption header, if any
internal Int64 _UncompressedSize;
internal Int32 _TimeBlob;
private bool _crcCalculated;
internal Int32 _Crc32;
internal byte[] _Extra;
private bool _metadataChanged;
private bool _restreamRequiredOnSave;
private bool _sourceIsEncrypted;
private bool _skippedDuringSave;
private UInt32 _diskNumber;
private static System.Text.Encoding ibm437 = System.Text.Encoding.ASCII;
//private System.Text.Encoding _provisionalAlternateEncoding = System.Text.Encoding.ASCII;
private System.Text.Encoding _actualEncoding;
internal ZipContainer _container;
private long __FileDataPosition = -1;
private byte[] _EntryHeader;
internal Int64 _RelativeOffsetOfLocalHeader;
private Int64 _future_ROLH;
private Int64 _TotalEntrySize;
private int _LengthOfHeader;
private int _LengthOfTrailer;
internal bool _InputUsesZip64;
private UInt32 _UnsupportedAlgorithmId;
internal string _Password;
internal ZipEntrySource _Source;
internal EncryptionAlgorithm _Encryption;
internal EncryptionAlgorithm _Encryption_FromZipFile;
internal byte[] _WeakEncryptionHeader;
internal Stream _archiveStream;
private Stream _sourceStream;
private Nullable<Int64> _sourceStreamOriginalPosition;
private bool _sourceWasJitProvided;
private bool _ioOperationCanceled;
private bool _presumeZip64;
private Nullable<bool> _entryRequiresZip64;
private Nullable<bool> _OutputUsesZip64;
private bool _IsText; // workitem 7801
private ZipEntryTimestamp _timestamp;
private static System.DateTime _unixEpoch = new System.DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
private static System.DateTime _win32Epoch = System.DateTime.FromFileTimeUtc(0L);
private static System.DateTime _zeroHour = new System.DateTime(1, 1, 1, 0, 0, 0, DateTimeKind.Utc);
private WriteDelegate _WriteDelegate;
private OpenDelegate _OpenDelegate;
private CloseDelegate _CloseDelegate;
// summary
// The default size of the IO buffer for ZipEntry instances. Currently it is 8192 bytes.
// summary
//public const int IO_BUFFER_SIZE_DEFAULT = 8192; // 0x8000; // 0x4400
}
/// <summary>
/// An enum that specifies the type of timestamp available on the ZipEntry.
/// </summary>
///
/// <remarks>
///
/// <para>
/// The last modified time of a file can be stored in multiple ways in
/// a zip file, and they are not mutually exclusive:
/// </para>
///
/// <list type="bullet">
/// <item>
/// In the so-called "DOS" format, which has a 2-second precision. Values
/// are rounded to the nearest even second. For example, if the time on the
/// file is 12:34:43, then it will be stored as 12:34:44. This first value
/// is accessible via the <c>LastModified</c> property. This value is always
/// present in the metadata for each zip entry. In some cases the value is
/// invalid, or zero.
/// </item>
///
/// <item>
/// In the so-called "Windows" or "NTFS" format, as an 8-byte integer
/// quantity expressed as the number of 1/10 milliseconds (in other words
/// the number of 100 nanosecond units) since January 1, 1601 (UTC). This
/// format is how Windows represents file times. This time is accessible
/// via the <c>ModifiedTime</c> property.
/// </item>
///
/// <item>
/// In the "Unix" format, a 4-byte quantity specifying the number of seconds since
/// January 1, 1970 UTC.
/// </item>
///
/// <item>
/// In an older format, now deprecated but still used by some current
/// tools. This format is also a 4-byte quantity specifying the number of
/// seconds since January 1, 1970 UTC.
/// </item>
///
/// </list>
///
/// <para>
/// This bit field describes which of the formats were found in a <c>ZipEntry</c> that was read.
/// </para>
///
/// </remarks>
[Flags]
internal enum ZipEntryTimestamp
{
/// <summary>
/// Default value.
/// </summary>
None = 0,
/// <summary>
/// A DOS timestamp with 2-second precision.
/// </summary>
DOS = 1,
/// <summary>
/// A Windows timestamp with 100-ns precision.
/// </summary>
Windows = 2,
/// <summary>
/// A Unix timestamp with 1-second precision.
/// </summary>
Unix = 4,
/// <summary>
/// A Unix timestamp with 1-second precision, stored in InfoZip v1 format. This
/// format is outdated and is supported for reading archives only.
/// </summary>
InfoZip1 = 8,
}
/// <summary>
/// The method of compression to use for a particular ZipEntry.
/// </summary>
///
/// <remarks>
/// <see
/// href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">PKWare's
/// ZIP Specification</see> describes a number of distinct
/// cmopression methods that can be used within a zip
/// file. DotNetZip supports a subset of them.
/// </remarks>
internal enum CompressionMethod
{
/// <summary>
/// No compression at all. For COM environments, the value is 0 (zero).
/// </summary>
None = 0,
/// <summary>
/// DEFLATE compression, as described in <see
/// href="http://www.ietf.org/rfc/rfc1951.txt">IETF RFC
/// 1951</see>. This is the "normal" compression used in zip
/// files. For COM environments, the value is 8.
/// </summary>
Deflate = 8,
#if BZIP
/// <summary>
/// BZip2 compression, a compression algorithm developed by Julian Seward.
/// For COM environments, the value is 12.
/// </summary>
BZip2 = 12,
#endif
}
#if NETCF
internal class NetCfFile
{
public static int SetTimes(string filename, DateTime ctime, DateTime atime, DateTime mtime)
{
IntPtr hFile = (IntPtr) CreateFileCE(filename,
(uint)0x40000000L, // (uint)FileAccess.Write,
(uint)0x00000002L, // (uint)FileShare.Write,
0,
(uint) 3, // == open existing
(uint)0, // flagsAndAttributes
0);
if((int)hFile == -1)
{
// workitem 7944: don't throw on failure to set file times
// throw new ZipException("CreateFileCE Failed");
return Interop.Marshal.GetLastWin32Error();
}
SetFileTime(hFile,
BitConverter.GetBytes(ctime.ToFileTime()),
BitConverter.GetBytes(atime.ToFileTime()),
BitConverter.GetBytes(mtime.ToFileTime()));
CloseHandle(hFile);
return 0;
}
public static int SetLastWriteTime(string filename, DateTime mtime)
{
IntPtr hFile = (IntPtr) CreateFileCE(filename,
(uint)0x40000000L, // (uint)FileAccess.Write,
(uint)0x00000002L, // (uint)FileShare.Write,
0,
(uint) 3, // == open existing
(uint)0, // flagsAndAttributes
0);
if((int)hFile == -1)
{
// workitem 7944: don't throw on failure to set file time
// throw new ZipException(String.Format("CreateFileCE Failed ({0})",
// Interop.Marshal.GetLastWin32Error()));
return Interop.Marshal.GetLastWin32Error();
}
SetFileTime(hFile, null, null,
BitConverter.GetBytes(mtime.ToFileTime()));
CloseHandle(hFile);
return 0;
}
[Interop.DllImport("coredll.dll", EntryPoint="CreateFile", SetLastError=true)]
internal static extern int CreateFileCE(string lpFileName,
uint dwDesiredAccess,
uint dwShareMode,
int lpSecurityAttributes,
uint dwCreationDisposition,
uint dwFlagsAndAttributes,
int hTemplateFile);
[Interop.DllImport("coredll", EntryPoint="GetFileAttributes", SetLastError=true)]
internal static extern uint GetAttributes(string lpFileName);
[Interop.DllImport("coredll", EntryPoint="SetFileAttributes", SetLastError=true)]
internal static extern bool SetAttributes(string lpFileName, uint dwFileAttributes);
[Interop.DllImport("coredll", EntryPoint="SetFileTime", SetLastError=true)]
internal static extern bool SetFileTime(IntPtr hFile, byte[] lpCreationTime, byte[] lpLastAccessTime, byte[] lpLastWriteTime);
[Interop.DllImport("coredll.dll", SetLastError=true)]
internal static extern bool CloseHandle(IntPtr hObject);
}
#endif
}