Tar Component

Properties   Methods   Events   Config Settings   Errors  

The Tar component implements a tar archive utility, compatible with the UNIX tar and untar utilities. The component supports the old v7 tar format. The component also implements gzip compression and can be used to create or decompress .tar.gz archives.

Syntax

nsoftware.IPWorksZip.Tar

Remarks

The interface is identical to that of the Zip component, and is the same whether gzip compression is used or not. In particular, the Compress method is used to create tar archives, even if actual compression is not used.

To create a new archive, first set the ArchiveFile property to the name of the archive to be created. Then, specify the files to be compressed either by invoking IncludeFiles, or by adding a new object to the Files collection and setting the values of the DecompressedName and CompressedName. fields. Finally, call the Compress method to create the archive.

To decompress an existing archive, set ArchiveFile to the name of the archive to be decompressed. The ExtractToPath property may be set, and then calling the ExtractAll method will decompress all files in the archive to this path.

For finer control, the Scan method should be used to read the file information stored in the archive. This will fill out the information in the Files collection. The values of DecompressedName may then be changed if desired. Finally, ExtractAll may be used to decompress the entire archive, or Extract may be used for finer control.

Data may be streamed out by setting WriteToProgressEvent to true. Then, the Progress event may be trapped to retrieve the data.

tar.gz files may be created or extracted by setting the UseGzipCompression property to true. When Compress is invoked, this will cause all output to be streamed through a gzip compressor as it is written. When extracting or scanning the tar archive will automatically be decompressed and written temporarily to disk. Note that this might cause Scan, Extract, and ExtractAll to operate slowly without firing events.

.gz files may also be compressed or decompressed using the Gzip component.

Example (Creating a Tar File)

ZipControl.ArchiveFile = "c:\test.tar.gz" ZipControl.RecurseSubdirectories = true ZipControl.UseGzipCompression = true ZipControl.IncludeFiles("c:\foo\*") ZipControl.Compress() Example (Extracting from a Tar File)

ZipControl.ArchiveFile = "c:\temp.tar" ZipControl.UseGzipCompression = false ZipControl.ExtractToPath = "c:\extracted\" ZipControl.ExtractAll()

Property List


The following is the full list of the properties of the component with short descriptions. Click on the links for further details.

ArchiveFileThe name of the zip, gzip, tar, or jar archive.
ExcludedFilesA list of files to exclude.
ExtractToPathA base path to decompress to.
FilesCollection of Tar archive files.
OverwriteFilesWhether or not to overwrite files.
RecurseSubdirectoriesWhether or not to recurse into subdirectories.
TarData(Decompression only) The tar file contents as a byte array.
UseGzipCompressionWhether or not to use gzip compression.

Method List


The following is the full list of the methods of the component with short descriptions. Click on the links for further details.

AbortAborts the current operation.
AppendAdds a file to an existing archive.
CompressCreates the compressed archive.
ConfigSets or retrieves a configuration setting.
DeleteDeletes one or more files from an existing archive.
ExtractExtracts a single file, directory, or group of files, from the archive.
ExtractAllExtracts all files from the compressed archive.
IncludeFilesSpecifies that the indicated files should be added to the archive.
ResetResets the component.
ScanScans the compressed archive.
SetArchiveInputStreamThe stream to read the zip, tar, jar, or gzip archive from.
SetArchiveOutputStreamThe stream to write the zip, tar, jar, or gzip archive to.

Event List


The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.

BeginFileFired before each file is processed.
EndFileFired after each file is processed.
ErrorInformation about non-fatal errors.
OverwriteFired whenever a file exists and may be overwritten.
ProgressFired as progress is made.

Config Settings


The following is a list of config settings for the component with short descriptions. Click on the links for further details.

CheckForFileLocksIf true, the component requests an exclusive lock during initialization.
CloseStreamAfterCompressIf true, the component will close the output stream after compression.
CompressionLevelThe level of compression to use when Gzip compression is enabled.
EncodingEncoding to be used for filenames.
ExcludedAttributesAttributes of files to be excluded.
ExtractFilesOnlyWhether to only extract the files contained within the archive.
ExtraNullBytesExtra null bytes to append to the end of the file.
InvalidCharReplacementReplaces invalid characters with the specified character.
OverwriteReadonlyFilesWhether to overwrite readonly files.
PreserveModifiedTimeWhether or not to preserve the original modified time on extracted files.
SetFilePermissionsWhether to set UNIX file permissions.
SymlinkActionThat action to take when a symlink is encountered.
TempPathThe location where temporary files are created.
WriteToProgressEventWhether or not to write data to the Progress Event.
BuildInfoInformation about the product's build.
GUIAvailableTells the component whether or not a message loop is available for processing events.
LicenseInfoInformation about the current license.
MaskSensitiveWhether sensitive data is masked in log messages.
UseInternalSecurityAPITells the component whether or not to use the system security libraries or an internal implementation.

ArchiveFile Property (Tar Component)

The name of the zip, gzip, tar, or jar archive.

Syntax

public string ArchiveFile { get; set; }
Public Property ArchiveFile As String

Default Value

""

Remarks

This property specifies the name of the archive to be read or written. This property is required when extracting files.

When Scan, Extract, or ExtractAll is invoked, the file specified by ArchiveFile will be opened for read. If the file does not exist, a trappable error will be generated.

When Compress is called, the file named by ArchiveFile will be written; if a file of this name already exists the Overwrite event will be fired. If ArchiveFile is set to the empty string (""), the archive will not be written to disk, and will be provided only through the Progress event.

The filename may be specified with or without a path. Paths may be relative or absolute, and should be specified in the format native to the host operating system. The filename should be specified with the appropriate extension (such as "zip"); an extension will not automatically be appended by the component.

If the file cannot be read, or written, as appropriate, a trappable error will be generated.

Example (Creating an Archive)

ZipControl.ArchiveFile = "c:\test.zip" ZipControl.RecurseSubdirectories = true ZipControl.IncludeFiles("c:\foo\*") ZipControl.Compress()

Note: an archive already open for read may be closed by setting ArchiveFile to the empty string ("").

ExcludedFiles Property (Tar Component)

A list of files to exclude.

Syntax

public string ExcludedFiles { get; set; }
Public Property ExcludedFiles As String

Default Value

""

Remarks

This property specifies files that should be excluded when Compress or Extract is invoked. When Compress is invoked, each value of DecompressedName in Files will be compared to ExcludedFiles, and each file will be excluded if the name matches. When Extract is called, each value of CompressedName in Files matching the parameter to Extract will be compared to ExcludedFiles, and will be excluded if appropriate. Calling the ExtractAll method will ignore this property and extract all files in the archive.

This property may be set to one or more filenames or directory names. Files may be specified with or without a path, and with or without wildcards. If a path is specified, files in the indicated directory will be excluded; subdirectories will be recursed into if RecurseSubdirectories is true. If no path is specified but wildcards are, matching files in all directories will be excluded. If a single filename without a path is specified, it must correspond exactly to the appropriate value of CompressedName or DecompressedName.

Directories should end with a slash ("/" or "\", as appropriate.) If a directory is specified, all files and subdirectories in the specified directory will be excluded.

A pipe character ("|") should be used to separate multiple file or directory names.

The following examples illustrate the use of the property:

Example

ZipControl.ArchiveFile = "c:\test.zip" ZipControl.IncludeFiles("c:\test\*") ZipControl.ExcludedFiles = "*.tmp" ZipControl.Compress() Example

ZipControl.ArchiveFile = "c:\test.tar" ZipControl.Scan() ZipControl.ExcludedFiles = "*.bak | backup/" ZipControl.ExtractToPath = "c:\temp" ZipControl.Extract("*") As per the examples, the property should be specified differently for compression and decompression. When invoking Compress, the format of ExcludedFiles should correspond to that of the local file system. When invoking Extract the format should correspond to standard (UNIX) format, and should not contain drive letters or backslashes.

You may exclude files based on their attributes as well: See the ExcludedAttributes configuration setting for more information.

If the property is set to the empty string, no files will be excluded. This property is never reset automatically, so be sure to reset it manually if using a single instance of the component for both compression and extraction. Failure to do so may result in I/O errors or unexpected results.

ExtractToPath Property (Tar Component)

A base path to decompress to.

Syntax

public string ExtractToPath { get; set; }
Public Property ExtractToPath As String

Default Value

""

Remarks

Setting the ExtractToPath property affects the operation of the Extract and ExtractAll methods. Setting this property to a nonempty string will cause all decompressed files to be written to the specified path. If pathnames are given in the values of DecompressedName they will be regarded as relative to ExtractToPath.

If the specified directory does not exist, it will be created when extraction is done.

ExtractToPath should always be specified in the format native to the host operating system, and with a trailing slash or backslash. If the path is specified otherwise, it will be immediately converted and stored in the converted format. For example, "/temp" would be immediately converted to "\temp\" on a Windows system.

Example (Extracting from an Archive)

ZipControl.ArchiveFile = "c:\temp.zip" ZipControl.ExtractToPath = "c:\extracted\" ZipControl.ExtractAll()

Example - Adding Files Dim i as Integer ZipControl.ArchiveFile = "c:\test.zip" ZipControl.Scan() For i = 0 to ZipControl.Files.Count - 1 ZipControl.Files(i).DecompressedName(i) = "c:\temp\" + ZipControl.Files(i).DecompressedName Next i ZipControl.ExtractToPath = "" ZipControl.ExtractAll() ZipControl.IncludeFiles("c:\extra\*") ZipControl.Compress()

Files Property (Tar Component)

Collection of Tar archive files.

Syntax

public TARFileList Files { get; }
Public Property Files As TARFileList

Remarks

When a compressed archive is scanned or decompressed, the values of this collection are populated accordingly.

When creating a compressed archive, this property may be used to set the files to be stored. For each entry added to the collection, the DecompressedName field should be set to the name of the file to be decompressed, and the CompressedName field should be set to the filename to store in the archive.

Archives may also be created using the IncludeFiles method. Invoking the IncludeFiles method causes the values of this collection to be filled out. These values may then be changed directly if desired.

Please refer to the TARFile type for a complete list of fields.

OverwriteFiles Property (Tar Component)

Whether or not to overwrite files.

Syntax

public bool OverwriteFiles { get; set; }
Public Property OverwriteFiles As Boolean

Default Value

True

Remarks

If this property is set to true, existing files will be overwritten when decompressing. When Extract or ExtractAll is called, each file specified in Files will be checked for existence. If a file exists, the Overwrite event will be fired, and the files will be overwritten if OverwriteFiles is set to true.

More precise control of which files should be overwritten may be gained by listening to the Overwrite event and altering its parameters when the event is fired.

This property only affects the operation of Extract and ExtractAll. When compressing files, ArchiveFile will always be overwritten unless the user specifies otherwise in the Overwrite event.

RecurseSubdirectories Property (Tar Component)

Whether or not to recurse into subdirectories.

Syntax

public bool RecurseSubdirectories { get; set; }
Public Property RecurseSubdirectories As Boolean

Default Value

True

Remarks

This property affects the behavior of IncludeFiles and Extract and the meaning of ExcludedFiles. If this property is set to true, IncludeFiles will recurse into all subdirectories whenever it performs a search on the file system.

Be sure RecurseSubdirectories is set to the appropriate value before invoking IncludeFiles, Extract, or Compress; changing the value of this property after method calls will not retroactively alter their effects.

Example (Creating an Archive)

ZipControl.ArchiveFile = "c:\test.zip" ZipControl.RecurseSubdirectories = true ZipControl.IncludeFiles("c:\foo\*") ZipControl.Compress()

TarData Property (Tar Component)

(Decompression only) The tar file contents as a byte array.

Syntax

public string TarData { set; }
public byte[] TarDataB { set; }
Public WriteOnly Property TarData As String
Public WriteOnly Property TarDataB As Byte()

Default Value

""

Remarks

Normally you should set ArchiveFile before invoking Scan or Extract. If you prefer to read the tar file from memory you may set TarData instead. TarData should be set to the entire contents of the tar file; this will allow you to read from the archive without writing any temporary files to disk.

If you would like to extract data from the archive without ever writing to disk you should also set WriteToProgressEvent to true, and after invoking Scan, you should set the value of DecompressedName for each file in the Files collection to an empty string. Then, when you invoke Extract (or ExtractAll) the data will be provided in the Progress event.

This property is write-only. Note that modifying a tar file stored in TarData is not supported, so Append, Delete, etc., will throw exceptions.

This property is write-only and not available at design time.

UseGzipCompression Property (Tar Component)

Whether or not to use gzip compression.

Syntax

public bool UseGzipCompression { get; set; }
Public Property UseGzipCompression As Boolean

Default Value

False

Remarks

If this property is set to true, the component will operate on tar archives that have been compressed with gzip. The interface of the component remains the same. During compression, the data will be streamed through a gzip compressor as it is written to the file. During decompression, the component will unzip the data to a temporary tar archive, and then automatically scan or decompress the tar archive.

The creation of the temporary tar file will occur when the Scan method is invoked (note that this method is invoked automatically by Extract and ExtractAll if it is not invoked explicitly by the user). The entire file must be decompressed, so Scan might operate slowly, and the Progress event will be fired as the tar file is extracted. If Scan is invoked automatically by Extract or ExtractAll, the PercentProcessed parameter of the event will increase from 0 to 100 as the archive is decompressed, and again as files are extracted from the temporary file.

The temporary file will automatically be deleted by the component after it is no longer needed. To extract the tar file itself (rather than its contents), the Gzip component should be used.

Due to the nature of the gzip format, Append and Delete are not supported for .tar.gz files.

If this property is set to false, the component will create and read ordinary, uncompressed tar archives.

NOTE: This is not supported when using an input stream for extraction.

Abort Method (Tar Component)

Aborts the current operation.

Syntax

public void Abort();

Async Version
public async Task Abort();
public async Task Abort(CancellationToken cancellationToken);
Public Sub Abort()

Async Version
Public Sub Abort() As Task
Public Sub Abort(cancellationToken As CancellationToken) As Task

Remarks

Abort may be used to immediately interrupt compression or decompression. Any files partially written by the component will be deleted.

In case Append or Delete is aborted the archive will be left in its original state.

Append Method (Tar Component)

Adds a file to an existing archive.

Syntax

public void Append(string decompressedName, string compressedName);

Async Version
public async Task Append(string decompressedName, string compressedName);
public async Task Append(string decompressedName, string compressedName, CancellationToken cancellationToken);
Public Sub Append(ByVal DecompressedName As String, ByVal CompressedName As String)

Async Version
Public Sub Append(ByVal DecompressedName As String, ByVal CompressedName As String) As Task
Public Sub Append(ByVal DecompressedName As String, ByVal CompressedName As String, cancellationToken As CancellationToken) As Task

Remarks

Append may be used to add a file to an existing archive. Unlike IncludeFiles, Append compresses and adds the file to the archive as soon as it is invoked.

DecompressedName should be set to the name of the single file to be added. It should be specified with a path if necessary, to allow the component to find it. The value of CompressedName is the name that will be stored in the archive.

When Append is invoked, the Scan method will first be invoked, if it has not been invoked already. Note that if IncludeFiles has been invoked, or if the values of CompressedName and DecompressedName have been set for that file in the Files collection, this information will be reset by the call to Scan.

After the file is added, the array properties will be updated appropriately.

This method may only be used to add a file to an existing archive. To add files to a new archive, the IncludeFiles and Compress methods should be used.

Due to the nature of the gzip format, Append and Delete are not supported for .tar.gz files.

Compress Method (Tar Component)

Creates the compressed archive.

Syntax

public void Compress();

Async Version
public async Task Compress();
public async Task Compress(CancellationToken cancellationToken);
Public Sub Compress()

Async Version
Public Sub Compress() As Task
Public Sub Compress(cancellationToken As CancellationToken) As Task

Remarks

Invoking Compress creates the archive specified by ArchiveFile. When the method is called, all files specified by the DecompressedName field of the Files collection will be compressed and written to ArchiveFile.

The compressed data may be streamed out by setting WriteToProgressEvent to true. If streaming is enabled the compressed data will also be provided via the Progress event. If ArchiveFile is set to an empty string the archive will be written only to this event.

The files to compress are specified in the Files collection. The file names are specified by CompressedName and DecompressedName. These should be specified before invoking Compress, either manually or by invoking IncludeFiles.

The BeginFile and EndFile events will be fired as files are processed, and the Progress event will be fired as data is compressed.

Existing files will be overwritten by the component if OverwriteFiles is set to true. Finer control over which files are overwritten may be gained by trapping the Overwrite event.

Example (Creating an Archive)

ZipControl.ArchiveFile = "c:\test.zip" ZipControl.RecurseSubdirectories = true ZipControl.IncludeFiles("c:\foo\*") ZipControl.Compress()

Config Method (Tar Component)

Sets or retrieves a configuration setting.

Syntax

public string Config(string configurationString);

Async Version
public async Task<string> Config(string configurationString);
public async Task<string> Config(string configurationString, CancellationToken cancellationToken);
Public Function Config(ByVal ConfigurationString As String) As String

Async Version
Public Function Config(ByVal ConfigurationString As String) As Task(Of String)
Public Function Config(ByVal ConfigurationString As String, cancellationToken As CancellationToken) As Task(Of String)

Remarks

Config is a generic method available in every component. It is used to set and retrieve configuration settings for the component.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

Delete Method (Tar Component)

Deletes one or more files from an existing archive.

Syntax

public void Delete(string filenames);

Async Version
public async Task Delete(string filenames);
public async Task Delete(string filenames, CancellationToken cancellationToken);
Public Sub Delete(ByVal Filenames As String)

Async Version
Public Sub Delete(ByVal Filenames As String) As Task
Public Sub Delete(ByVal Filenames As String, cancellationToken As CancellationToken) As Task

Remarks

Delete deletes one or more files from an existing archive, without reprocessing the compressed data. The archive will be opened immediately, and the file(s) will immediately be removed permanently from the archive.

The list of filenames should be specified exactly as when calling Extract:

Filenames may be set to one or more filenames or directory names. Files may be specified with or without a path, and with or without wildcards. If a path is specified, files in the indicated directory will be affected; subdirectories will be recursed into if RecurseSubdirectories is true. If no path is specified but wildcards are, matching files in all directories will be affected. If a single filename without a path is specified, it must correspond exactly to the appropriate value of CompressedName.

Directories should end with a slash ("/"). If a directory is specified, all files and subdirectories in the specified directory will be affected.

A pipe character ("|") should be used to separate multiple file or directory names. Alternatively, the method may be invoked repeatedly.

The ExcludedFiles property may be used to further limit the files to be deleted. When Delete is used to delete a directory or match wildcards, each file to be deleted is first compared against ExcludedFiles, and any files marked as excluded will not be deleted. When Delete is used to delete a single file, the value of ExcludedFiles will be ignored.

When the method is invoked, the Scan method will first be invoked, if it has not been invoked already. Note that if IncludeFiles has been invoked, or if the values of CompressedName and DecompressedName for each file in the Files collection have been set, this information will be reset by the call to Scan.

When deleting multiple files, the component will operate most efficiently if all filenames are passed to Delete in a single invocation of the method. Invoking Delete repeatedly on large archives is not recommended.

Invoking Delete will only remove files from ArchiveFile; it will not delete the files from the disk.

Example

ZipControl.ArchiveFile = "c:\\test.zip" ZipControl.Delete("default_readme.txt"); ZipControl.Append("\\mydir\\my_readme.txt", "my_readme.txt")

Extract Method (Tar Component)

Extracts a single file, directory, or group of files, from the archive.

Syntax

public void Extract(string filenames);

Async Version
public async Task Extract(string filenames);
public async Task Extract(string filenames, CancellationToken cancellationToken);
Public Sub Extract(ByVal Filenames As String)

Async Version
Public Sub Extract(ByVal Filenames As String) As Task
Public Sub Extract(ByVal Filenames As String, cancellationToken As CancellationToken) As Task

Remarks

Extract extracts one or more files from the archive. The file(s) will be extracted to the directory specified by ExtractToPath, and given the names found in the archive or specified by the DecompressedName of the file in the Files collection.

Filenames may be set to one or more filenames or directory names. Files may be specified with or without a path, and with or without wildcards. If a path is specified, files in the indicated directory will be affected; subdirectories will be recursed into if RecurseSubdirectories is true. If no path is specified but wildcards are, matching files in all directories will be affected. If a single filename without a path is specified, it must correspond exactly to the appropriate value of CompressedName.

Directories should end with a slash ("/"). If a directory is specified, all files and subdirectories in the specified directory will be affected.

A pipe character ("|") should be used to separate multiple file or directory names. Alternatively, the method may be invoked repeatedly.

The ExcludedFiles property may be used to further limit the files to be extracted. When Extract is used to extract a directory or match wildcards, each file to be extracted is first compared against ExcludedFiles, and any files marked as excluded will not be extracted. When Extract is used to extract a single file, the value of ExcludedFiles will be ignored.

To extract all files in the archive, the ExtractAll method may be used.

The BeginFile and EndFile events will be fired before and after each file is extracted, and the Progress event will be fired as the data is extracted. If WriteToProgressEvent is set to true, the decompressed data will be streamed out through the Progress event.

Example

ZipControl.ArchiveFile = "c:\test.tar" ZipControl.ExcludedFiles = "*.bak | backup/" ZipControl.ExtractToPath = "c:\temp" ZipControl.Extract("*") Example ZipControl.ArchiveFile = "c:\test.zip" ZipControl.ExcludedFiles = "" ZipControl.ExtractToPath = "c:\temp" ZipControl.Extract("code/") Example ZipControl.ArchiveFile = "c:\test.jar" ZipControl.ExcludedFiles = "*.txt" ZipControl.ExtractToPath = "c:\" ZipControl.Extract("* | docs/readme.txt")

ExtractAll Method (Tar Component)

Extracts all files from the compressed archive.

Syntax

public void ExtractAll();

Async Version
public async Task ExtractAll();
public async Task ExtractAll(CancellationToken cancellationToken);
Public Sub ExtractAll()

Async Version
Public Sub ExtractAll() As Task
Public Sub ExtractAll(cancellationToken As CancellationToken) As Task

Remarks

ExtractAll extracts all files from the archive. The file(s) will be extracted to the directory specified by ExtractToPath, and given the names found in the archive or specified by the DecompressedName field of the file in the Files collection.

If Scan has not been invoked when ExtractAll is called, Scan will automatically be invoked, and the Files collection will be set to the values found in the archive. To manually set the decompressed filenames, Scan should be invoked before setting the DecompressedName field.

Invoking this method is equivalent to setting ExcludedFiles to the empty string, and then invoking Extract with "*" as the argument. Calling this method will cause the ExcludedFiles property to be ignored; to extract all files except those specified by ExcludedFiles, call the Extract method with the wildcard "*" as the method parameter instead of calling this method.

The BeginFile and EndFile events will be fired before and after each file is extracted, and the Progress event will be fired as the data is extracted. If WriteToProgressEvent is set to true, the decompressed data will be streamed out through the Progress event.

Example (Extracting from an Archive)

ZipControl.ArchiveFile = "c:\temp.zip" ZipControl.ExtractToPath = "c:\extracted\" ZipControl.ExtractAll()

IncludeFiles Method (Tar Component)

Specifies that the indicated files should be added to the archive.

Syntax

public void IncludeFiles(string filenames);

Async Version
public async Task IncludeFiles(string filenames);
public async Task IncludeFiles(string filenames, CancellationToken cancellationToken);
Public Sub IncludeFiles(ByVal filenames As String)

Async Version
Public Sub IncludeFiles(ByVal filenames As String) As Task
Public Sub IncludeFiles(ByVal filenames As String, cancellationToken As CancellationToken) As Task

Remarks

IncludeFiles may be used before Compress, to specify the files to be compressed. Invoking this method populates the Files collection accordingly.

Invoking the method does not create or alter the archive.

The argument should be a pipe ("|") -delimited sequence of one or more filenames. The filenames should be specified with paths if necessary, so that the files may be found on the local file system. The filenames will be stored as is in the DecompressedName field, and without a pathname in the CompressedName field of the Files collection.

Filenames may include the wildcards '?', '*', and '[ .. ]'. '?' will match any single character, and '*' will match an arbitrary sequence of characters. '[ .. ]' may be used to match any of the characters inside, or a range, such as '[a-z]'. A '\' can be used to escape wildcard characters.

If wildcards are specified, the file system will be scanned and all files matching the specified mask will be added. Moreover, subdirectories will be recursed into if RecurseSubdirectories is set to true. When recursing into subdirectories, relative path information will be stored in CompressedName field of the Files collection.

The ExcludedFiles may be used to limit the files to be compressed. This property is checked when Compress is invoked, rather than when IncludeFiles is invoked, so this property may be set before or after invoking IncludeFiles.

Note that invoking IncludeFiles will not reset the component, or remove old values of CompressedName and DecompressedName. This may be done by first clearing the Files collection.

Example

ZipControl.IncludeFiles("c:\test\* | c:\readme") ZipControl.ExcludedFiles = "*.tmp" ZipControl.Compress()

Reset Method (Tar Component)

Resets the component.

Syntax

public void Reset();

Async Version
public async Task Reset();
public async Task Reset(CancellationToken cancellationToken);
Public Sub Reset()

Async Version
Public Sub Reset() As Task
Public Sub Reset(cancellationToken As CancellationToken) As Task

Remarks

Reset resets the state of the component. The Files collection will be cleared, all properties will be set to their default values, and any files open will be closed.

Scan Method (Tar Component)

Scans the compressed archive.

Syntax

public void Scan();

Async Version
public async Task Scan();
public async Task Scan(CancellationToken cancellationToken);
Public Sub Scan()

Async Version
Public Sub Scan() As Task
Public Sub Scan(cancellationToken As CancellationToken) As Task

Remarks

This method will scan the archive specified by ArchiveFile. The number of files and their names and sizes will be determined and written to the Files collection.

After scanning the archive, the values of DecompressedName may be changed if desired, and any number of files may be decompressed. The Extract method allows you to decompress files of your choice, and the ExtractAll method will decompress the entire archive.

Changing the values of the CompressedName field or the number of files in the Files collection will invalidate the scan. If either of these is changed and Extract or ExtractAll is then called; Scan will automatically be called again, and these values will be reset to their original values.

Calling this method will frequently generate a trappable error if the archive is corrupt. This is not guaranteed, however, as Scan only examines the headers.

Example

Dim i as Integer ZipControl.ArchiveFile = "c:\temp.zip" ZipControl.Scan() For i = 0 to ZipControl.Files(i).Count -1 Debug.Write("File name : ") Debug.Write(ZipControl.Files(i).DecompressedName) Debug.Write(" Size: ") Debug.WriteLine(ZipControl.Files(i).DecompressedSize) Next i

SetArchiveInputStream Method (Tar Component)

The stream to read the zip, tar, jar, or gzip archive from.

Syntax

public void SetArchiveInputStream(System.IO.Stream archiveStream);

Async Version
public async Task SetArchiveInputStream(System.IO.Stream archiveStream);
public async Task SetArchiveInputStream(System.IO.Stream archiveStream, CancellationToken cancellationToken);
Public Sub SetArchiveInputStream(ByVal ArchiveStream As System.IO.Stream)

Async Version
Public Sub SetArchiveInputStream(ByVal ArchiveStream As System.IO.Stream) As Task
Public Sub SetArchiveInputStream(ByVal ArchiveStream As System.IO.Stream, cancellationToken As CancellationToken) As Task

Remarks

This method should be set when the archive is to be read from a stream when Extract is called.

By default, and when this is set to null, the component will read from the file specified by ArchiveFile. However, when this is a valid stream, the data will be read from the stream.

SetArchiveOutputStream Method (Tar Component)

The stream to write the zip, tar, jar, or gzip archive to.

Syntax

public void SetArchiveOutputStream(System.IO.Stream archiveStream);

Async Version
public async Task SetArchiveOutputStream(System.IO.Stream archiveStream);
public async Task SetArchiveOutputStream(System.IO.Stream archiveStream, CancellationToken cancellationToken);
Public Sub SetArchiveOutputStream(ByVal ArchiveStream As System.IO.Stream)

Async Version
Public Sub SetArchiveOutputStream(ByVal ArchiveStream As System.IO.Stream) As Task
Public Sub SetArchiveOutputStream(ByVal ArchiveStream As System.IO.Stream, cancellationToken As CancellationToken) As Task

Remarks

This method should be set when the archive is to be written to a stream when Compress is called.

By default, and when this is set to null, the component will write to the file specified by ArchiveFile. However, when this is a valid stream, the data will be written to the stream.

BeginFile Event (Tar Component)

Fired before each file is processed.

Syntax

public event OnBeginFileHandler OnBeginFile;

public delegate void OnBeginFileHandler(object sender, TarBeginFileEventArgs e);

public class TarBeginFileEventArgs : EventArgs {
  public int Index { get; }
  public bool Skip { get; set; }
}
Public Event OnBeginFile As OnBeginFileHandler

Public Delegate Sub OnBeginFileHandler(sender As Object, e As TarBeginFileEventArgs)

Public Class TarBeginFileEventArgs Inherits EventArgs
  Public ReadOnly Property Index As Integer
  Public Property Skip As Boolean
End Class

Remarks

BeginFile is fired before each file is processed by the compressor or decompressor, as appropriate. Index contains the array index of the file about to be processed, and the CompressedName, DecompressedName, CompressedSize (decompression only), and DecompressedSize fields of the Files collection for this index contain more detailed information about the file about to be processed.

When extracting, an alternate location may be specified by trapping the event, and modifying DecompressedName and/or ExtractToPath. If DecompressedName is set to an empty string, the file will not be written to disk. If WriteToProgressEvent is true, the file will still be decompressed, and the data may be extracted through the Progress event.

This event may also be trapped while compressing. CompressedName and DecompressedName may be changed.

You may set the Skip parameter to true in order to skip the file completely while compressing or extracting.

EndFile Event (Tar Component)

Fired after each file is processed.

Syntax

public event OnEndFileHandler OnEndFile;

public delegate void OnEndFileHandler(object sender, TarEndFileEventArgs e);

public class TarEndFileEventArgs : EventArgs {
  public int Index { get; }
}
Public Event OnEndFile As OnEndFileHandler

Public Delegate Sub OnEndFileHandler(sender As Object, e As TarEndFileEventArgs)

Public Class TarEndFileEventArgs Inherits EventArgs
  Public ReadOnly Property Index As Integer
End Class

Remarks

EndFile is fired after each file is processed by the compressor or decompressor, as appropriate. Index contains the array index of the file processed, and the CompressedName, DecompressedName, CompressedSize, and DecompressedSize fields in the Files collection for this index contain more detailed information about the file processed.

Error Event (Tar Component)

Information about non-fatal errors.

Syntax

public event OnErrorHandler OnError;

public delegate void OnErrorHandler(object sender, TarErrorEventArgs e);

public class TarErrorEventArgs : EventArgs {
  public string Description { get; }
  public int ErrorCode { get; }
  public int Index { get; }
  public string Filename { get; }
  public bool Ignore { get; set; }
}
Public Event OnError As OnErrorHandler

Public Delegate Sub OnErrorHandler(sender As Object, e As TarErrorEventArgs)

Public Class TarErrorEventArgs Inherits EventArgs
  Public ReadOnly Property Description As String
  Public ReadOnly Property ErrorCode As Integer
  Public ReadOnly Property Index As Integer
  Public ReadOnly Property Filename As String
  Public Property Ignore As Boolean
End Class

Remarks

The Error event is fired when non-fatal errors occur during compression or decompression. Note that if this event is fired during decompression this may indicate that the archive is corrupt.

By default these errors will cause the component to fail with an exception. The exception may be overridden by setting Ignore to true. This will cause the error to be ignored, the file will be skipped if necessary, and the component will continue operation.

ErrorCode will correspond to one of the following errors:

1Bad or missing CRC-32 checksum.
2Failed to set creation date of a file.
111Can't open file for read (skipping).

Description contains a textual description of the error. Index and Filename contain the array index (where appropriate) and filename of the file being processed at the time of the error.

Overwrite Event (Tar Component)

Fired whenever a file exists and may be overwritten.

Syntax

public event OnOverwriteHandler OnOverwrite;

public delegate void OnOverwriteHandler(object sender, TarOverwriteEventArgs e);

public class TarOverwriteEventArgs : EventArgs {
  public string Filename { get; set; }
  public bool Overwrite { get; set; }
}
Public Event OnOverwrite As OnOverwriteHandler

Public Delegate Sub OnOverwriteHandler(sender As Object, e As TarOverwriteEventArgs)

Public Class TarOverwriteEventArgs Inherits EventArgs
  Public Property Filename As String
  Public Property Overwrite As Boolean
End Class

Remarks

Overwrite is fired when a file is about to be overwritten, and would overwrite an existing file. The event is fired during decompression.

Filename contains the full name of the file, specified with its pathname.

Overwrite specifies whether or not the file will be overwritten. For Zip, Jar, and Tar, this is equal by default to the value of the OverwriteFiles property. For Gzip, this value defaults to true.

Either of the parameters may be changed when the event is fired. Changing the value of Overwrite will override the default behavior of the component, and cause the file to be overwritten or not overwritten, depending on the value set. If Filename is changed, the value of Overwrite will be ignored, and the file will be written with the specified name. If a file of the new name also exists this file will be silently overwritten.

Progress Event (Tar Component)

Fired as progress is made.

Syntax

public event OnProgressHandler OnProgress;

public delegate void OnProgressHandler(object sender, TarProgressEventArgs e);

public class TarProgressEventArgs : EventArgs {
  public string Data { get; }
public byte[] DataB { get; } public string Filename { get; } public long BytesProcessed { get; } public int PercentProcessed { get; } }
Public Event OnProgress As OnProgressHandler

Public Delegate Sub OnProgressHandler(sender As Object, e As TarProgressEventArgs)

Public Class TarProgressEventArgs Inherits EventArgs
  Public ReadOnly Property Data As String
Public ReadOnly Property DataB As Byte() Public ReadOnly Property Filename As String Public ReadOnly Property BytesProcessed As Long Public ReadOnly Property PercentProcessed As Integer End Class

Remarks

The Progress event is automatically fired as compression or decompression is performed. When WriteToProgressEvent is true, the output data is provided through the Data parameter, allowing for it to be streamed out.

Filename contains the name of the file being written. If no file is being written, Filename will contain an empty string, and the output data will be provided exclusively through this event.

BytesProcessed contains the total number of uncompressed bytes processed. PercentProcessed contains the percent of uncompressed bytes processed, corresponding roughly to the running time of the operation.

For Gzip extraction only, BytesProcessed and PercentProcessed will reflect the number of compressed bytes extracted, as it is generally impossible to predetermine the total uncompressed size.

If WriteToProgressEvent is false, Data will contain null.

TARFile Type

The Tar file in the archive.

Remarks

This type contains information about the Tar file that either exists in the archive or is being added to the archive.

Fields

CompressedDate
long

Default Value: 0

The date and time of the entry, as stored within the archive.

FileCompressedDate contains the last modified date of the file, as stored within the archive (it does not generally correspond to when the file was compressed).

FileCompressedDate is returned in a platform-specific format. The Java,C++, and most other Editions will return the number of milliseconds since January 1, 1970, 00:00:00. This value may be passed directly to the java.util.Date constructor to create a java.util.Date object representing this date.

The .NET Edition will return the number of ticks, or 100-nanosecond intervals, since January 1, 0001, 00:00:00. This value may be passed directly to the System.DateTime constructor to create a System.DateTime object representing this date.

Reading the value of this property will return a meaningful value only after the archive has been successfully scanned or decompressed, and only if the values of ArchiveFile, Files collection, and CompressedName have not been changed since. If a meaningful value is not available this property will return a value of 0.

NOTE: This may be set accordingly when the InputStream field is set to a valid stream to input the data for the current file. If not set, the default, 0, is used. Otherwise the value is read from disk.

CompressedName
string

Default Value: ""

The file name of the current file, as stored inside of the archive. This may be the same as in DecompressedName, but is not required to be.

All paths are stored in the archive in standard (UNIX) format. Pathnames specified in the host operating system's format will be immediately converted.

This field should generally be set with a relative path or with no path at all. The exact interpretation of the path is left to the decompression software; generally, pathnames will be interpreted as relative to a base directory, and these subdirectories will be created as needed. Absolute pathnames (paths beginning with a / character) will not be interpreted correctly by the component, and may or may not be interpreted correctly by other decompression software.

Paths should be specified in standard (UNIX) format. They may also be specified in the format native to the host operating system, in which case they will be immediately converted.

Example

ZipControl.ArchiveFile = "c:\test.zip" ZipControl.Files.Add(new ZIPFile()) ZipControl.Files[0].DecompressedName = "c:\test\ipworkszip\temp\test.txt" ZipControl.Files[0].CompressedName = "readme.txt" ZipControl.Compress()

CompressedSize
long (read-only)

Default Value: -1

The size of the compressed data, as compressed within the archive. Headers, footers, etc., are not included in the size.

Reading the value of this property will return a meaningful value only after the archive has been compressed, scanned, or decompressed, and only if the values of ArchiveFile, or Files have not been changed since. If a meaningful value is not available this property will return a value of -1.

DecompressedName
string

Default Value: ""

The name of the file in the archive, as stored on the file system, outside the archive.

When compressing files, This field should be specified with a path, if necessary, to allow the file to be found by the component. If the file cannot be found during compression, a trappable error will be generated, and the archive will not be correctly written.

When decompressing files, the field indicates where the file should be written. After the archive is scanned, the values of CompressedName and DecompressedName will be set to the exact filenames found in the archive. The value of DecompressedName may then be changed if desired.

If DecompressedName is set to an empty string before extraction, the file will not be written to disk at all. It will still be written to the Progress event if WriteToProgressEvent is set to true.

If DecompressedName is set to an empty string before compression, the file will be skipped, and not written to the archive.

A base path for decompression may be specified by setting the ExtractToPath property. If ExtractToPath is set to a non-empty string, the files will be decompressed to the directory specified in ExtractToPath. If the value of DecompressedName contains a pathname it will be regarded as relative to ExtractToPath.

Paths on the local file system should be specified in the format native to the host operating system. They may also be specified in standard (UNIX) format, in which case they will be immediately converted.

Example

ZipControl.ArchiveFile = "c:\test.tar" ZipControl.Scan() ZipControl.ExtractToPath = "c:\temp\" ZipControl.Files[1].DecompressedName = "test\temp.out" ZipControl.Extract(ZipControl.Files[1].CompressedName) Incorrect Example ZipControl.ExtractToPath = "c:\temp\" ZipControl.Files[1].DecompressedName = "c:\temp\test\temp.out" 'The file would be extracted to c:\temp\c:\temp\test\temp.out

DecompressedSize
long (read-only)

Default Value: -1

The size of the file, as decompressed outside the archive. If an archive is open for read (i.e. has been scanned or decompressed), this information will be read from the archive headers. If an archive is not open for read, the component will retrieve the information for the corresponding value of DecompressedName from the local file system.

A value of -1 will be returned in case of an I/O error.

HardLinkName
string

Default Value: ""

The hard link name, for a file that represents a hard link. If you specify HardLinkName the file will be added to the tar file as a hard link. You should specify the name of the link in CompressedName and the name of the linked file in HardLinkName.

InputData
string

Default Value: ""

When This field is set, the component will read in the data from This field instead of reading from the file contained in the DecompressedName field.

InputDataB
byte []

Default Value: ""

When This field is set, the component will read in the data from This field instead of reading from the file contained in the DecompressedName field.

Permissions
string

Default Value: "644"

This field contains the UNIX permissions of the file, as stored in the tar archive. It will be written to the tar archive during compression. As native code is not used, permissions are read from and written to the tar archive only, and not to the file system.

The value should be specified as a string of three characters, representing the owner's permissions, the group's permissions, and others' permissions. Each character should be a bitmask of 4 (read access), 2 (write access), or 1 (executable access), as in chmod.

In Java, if the SetFilePermissions configuration setting is set to true, the component will shell out an instance of chmod for each file, and will attempt to set the file permissions to those specified in Permissions. Obviously, this functionality is operating system dependent and will fail in Windows in particular; it may also fail in other operating systems for a variety of reasons.

SymLinkName
string

Default Value: ""

The symbolic link name, for a file that represents a symbolic link. If you specify SymLinkName the file will be added to the tar file as a symbolic link. You should specify the name of the link in CompressedName and the name of the linked file in SymLinkName.

Constructors

public TARFile();
Public TARFile()
public TARFile(string decompressedName);
Public TARFile(ByVal DecompressedName As String)
public TARFile(string compressedName, string decompressedName);
Public TARFile(ByVal CompressedName As String, ByVal DecompressedName As String)
public TARFile(string compressedName, System.IO.Stream inputStream);
Public TARFile(ByVal CompressedName As String, ByVal InputStream As System.IO.Stream)

Config Settings (Tar Component)

The component accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

Tar Config Settings

CheckForFileLocks:   If true, the component requests an exclusive lock during initialization.

If set to true, the component will request an exclusive lock during initialization to ensure there are no other processes locking a file. This is a temporary lock and is released before work is done. This is especially useful when another process has a partial lock on a file, for instance when Outlook is working with a .pst.

False by default.

CloseStreamAfterCompress:   If true, the component will close the output stream after compression.

This property is true by default. Therefore, by default, the output stream will be closed after compression is completed. In order to keep streams open after the compression completes, you must set this config to false.

CompressionLevel:   The level of compression to use when Gzip compression is enabled.

This property specifies the level of compression to be used, between 1 and 6. Higher values will cause the component to compress better; lower values will cause the component to compress faster.

The default value is 4.

Encoding:   Encoding to be used for filenames.

The encoding to be used for filenames, and for Zip files, the password. The file contents are treated as binary data, and so encoding does not apply to the contents. At present only supported for Zip and Jar.

Default - Zip: "" (use default encoding of current machine, if possible)

Default - Jar: "UTF-8"

Example - This would set encoding to Japanese Shift-JIS.

Zip1.Config("Encoding=SJIS");

ExcludedAttributes:   Attributes of files to be excluded.

Files with attributes matching those specified will be excluded from compression or decompression. May be set to any combination of H (hidden), S (system), A (archive), and R (read-only). (Example: "HSR") Alternatively, may be set to a bitmask of the following flags: Readonly (1), Hidden (2), System (4), Directory (16), Archive (32).

For Java, when compressing, attributes other than "H" and "R" will be ignored (due to JRE limitations).

Default: "" (no excluded attributes)

ExtractFilesOnly:   Whether to only extract the files contained within the archive.

If true, only the files contained within the ArchiveFile are extracted directly to the specified ExtractToPath. Folders contained within the ArchiveFile will not be created within the ExtractToPath. If an archive contains files with the same name, you can control whether or not they get overwritten by setting OverwriteFiles.

ExtraNullBytes:   Extra null bytes to append to the end of the file.

If ExtraNullBytes is set to a nonzero value, the component will write the specified number of null bytes whenever it creates a tar file or appends to an existing one. Setting this property to 1024 (or higher) may be necessary to prevent compatibility problems with certain versions of untar.

InvalidCharReplacement:   Replaces invalid characters with the specified character.

This setting replaces all invalid characters encountered during decompression with the specified character.

If this setting is unspecified the invalid characters will not be replaced.

OverwriteReadonlyFiles:   Whether to overwrite readonly files.

If true, the component will overwrite readonly files when decompressing. If false (the default), the component will fire the Error event, instead, and will fail with an exception if the error is not trapped and explicitly ignored in the event.

PreserveModifiedTime:   Whether or not to preserve the original modified time on extracted files.

Specifies whether or not the modified time of the extracted files use the current time or the original time of the file in the archive.

When set to True (default) the extracted files will have the same modified time as the original file.

When set to False the modified time on the extracted files will be set to the current time.

SetFilePermissions:   Whether to set UNIX file permissions.

In Java, if the SetFilePermissions configuration setting is set to true, the component will shell out an instance of chmod for each file, and will attempt to set the file permissions to those specified in the Permissions field of the Files collection. This functionality is operating system dependent and will fail in Windows in particular; it may also fail in other operating systems for a variety of reasons.

By default, the component will write all output files with default permissions.

SymlinkAction:   That action to take when a symlink is encountered.

This setting specifies the action to take when a symlink is encountered during decompression. The component does not support symlinks and will fire the Error event. This setting indicates whether the symlink is ignored, or treated as an error. Possible values are:

0 (Ignore - default) The Error event fires and the Ignore parameter is True.
1 The component throws an exception.
This only applies when decompressing.
TempPath:   The location where temporary files are created.

When an archive uses GZip compression temporary files will be created when calling Scan or Extract. This setting specifies the location of the temporary files. If this setting is unspecified the system temp directory will be used.

WriteToProgressEvent:   Whether or not to write data to the Progress Event.

If WriteToProgressEvent is set to true, then all data produced through invocations of Extract, ExtractAll, and Compress will be written to the Progress event as well as to disk. Applications may stream out the compressed or decompressed data by trapping this event and copying the data.

If WriteToProgressEvent is set to false, the data will not be streamed out, and the Data parameter of the Progress event will contain null.

By default, this config is set to false.

Base Config Settings

BuildInfo:   Information about the product's build.

When queried, this setting will return a string containing information about the product's build.

GUIAvailable:   Whether or not a message loop is available for processing events.

In a GUI-based application, long-running blocking operations may cause the application to stop responding to input until the operation returns. The component will attempt to discover whether or not the application has a message loop and, if one is discovered, it will process events in that message loop during any such blocking operation.

In some non-GUI applications, an invalid message loop may be discovered that will result in errant behavior. In these cases, setting GUIAvailable to false will ensure that the component does not attempt to process external events.

LicenseInfo:   Information about the current license.

When queried, this setting will return a string containing information about the license this instance of a component is using. It will return the following information:

  • Product: The product the license is for.
  • Product Key: The key the license was generated from.
  • License Source: Where the license was found (e.g., RuntimeLicense, License File).
  • License Type: The type of license installed (e.g., Royalty Free, Single Server).
  • Last Valid Build: The last valid build number for which the license will work.
MaskSensitive:   Whether sensitive data is masked in log messages.

In certain circumstances it may be beneficial to mask sensitive data, like passwords, in log messages. Set this to true to mask sensitive data. The default is true.

This setting only works on these components: AS3Receiver, AS3Sender, Atom, Client(3DS), FTP, FTPServer, IMAP, OFTPClient, SSHClient, SCP, Server(3DS), Sexec, SFTP, SFTPServer, SSHServer, TCPClient, TCPServer.

UseInternalSecurityAPI:   Whether or not to use the system security libraries or an internal implementation.

When set to false, the component will use the system security libraries by default to perform cryptographic functions where applicable. In this case, calls to unmanaged code will be made. In certain environments, this is not desirable. To use a completely managed security implementation, set this setting to true.

Setting this configuration setting to true tells the component to use the internal implementation instead of using the system security libraries.

On Windows, this setting is set to false by default. On Linux/macOS, this setting is set to true by default.

If using the .NET Standard Library, this setting will be true on all platforms. The .NET Standard library does not support using the system security libraries.

Note: This setting is static. The value set is applicable to all components used in the application.

When this value is set, the product's system dynamic link library (DLL) is no longer required as a reference, as all unmanaged code is stored in that file.

Trappable Errors (Tar Component)

Errors

The following errors may be generated by the component. Note that frequently the error message will contain more specific information than what is listed here.

Note that some non-fatal errors may be trapped and explicitly ignored in the Error event. This will allow the component to continue operation even in case of error.

Tar Errors

103   The tar archive is of an invalid or unsupported format.
102   The gzip archive is of an invalid or unsupported format.
114   The file is too large.
115   Can't create empty archive.
116   The archive must be scanned prior to attempting this operation.
117   The array index is out of range.
118   The maximum size of the archive has been exceeded.
119   The archive must be specified, or streaming must be enabled.
120   The component is busy.
121   The Append method is not supported for .tar.gz files.
122   The Delete method is not supported for .tar.gz files.
124   Must specify the compressed name.
127   Bad CRC-32 checksum.
128   Unable to set file date.
129   Invalid permissions.
131   Unable to set permissions.
134   SymLink extraction not supported.
135   HardLink extraction not supported.
150   An I/O error has occurred (details follow).