ZCompress Module

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The ZCompress module implements an LZC compressor and decompressor. It is compatible with the UNIX compress utility.

Syntax

IPWorksZip.Zcompress

Remarks

The LZC file format is used only to archive a single file. Accordingly, the operation of the class is simpler than that of the other classs.

To compress with the class, set ArchiveFile to the name of the LZC compressed file to be created, and FileDecompressedName to the name of the file to be compressed. Finally, invoke Compress. To extract the file, first set ArchiveFile. FileDecompressedName may then be set; if not, it will automatically be set based on the ArchiveFile name. Finally, invoke the Extract method.

Example (Creating an LZC File)

ZipControl.ArchiveFile = "c:\test.Z" ZipControl.FileDecompressedName = "c:\test.txt" ZipControl.Compress() Example (Extracting from an LZC File)

ZipControl.ArchiveFile = "c:\test.Z" ZipControl.FileDecompressedName = "c:\test.txt" ZipControl.Extract()

Property List

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

Method List

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

Event List

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

Config Settings

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

ArchiveFile Property (ZCompress Module)

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

Syntax

• Swift
• Objective-C

public var archiveFile: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=archiveFile,setter=setArchiveFile:) NSString* archiveFile;

- (NSString*)archiveFile;
- (void)setArchiveFile :(NSString*)newArchiveFile;

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 class.

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 ("").

FileDecompressedName Property (ZCompress Module)

File name to decompress to, or compress from.

Syntax

• Swift
• Objective-C

public var fileDecompressedName: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=fileDecompressedName,setter=setFileDecompressedName:) NSString* fileDecompressedName;

- (NSString*)fileDecompressedName;
- (void)setFileDecompressedName :(NSString*)newFileDecompressedName;

Default Value

""

Remarks

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

When compressing a file and SetFileInputStream has not been called with a valid input stream, this property should be specified with a path, if necessary, to allow the file to be found by the class. If the file cannot be found when Compress is called, a trappable error will be generated, and the archive will not be correctly written.

When decompressing files, this property may be set prior to calling Extract. If this property is set to the empty string when Extract is called, Extract will automatically set this property to an appropriate value.

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.

FileInputData Property (ZCompress Module)

The data of the file to be compressed.

Syntax

• Swift
• Objective-C

public var fileInputData: String {
  get {...}
  set {...}
}

public var fileInputDataB: Data {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=fileInputData,setter=setFileInputData:) NSString* fileInputData;

- (NSString*)fileInputData;
- (void)setFileInputData :(NSString*)newFileInputData;

@property (nonatomic,readwrite,assign,getter=fileInputDataB,setter=setFileInputDataB:) NSData* fileInputDataB;

- (NSData*)fileInputDataB;
- (void)setFileInputDataB :(NSData*)newFileInputData;

Default Value

""

Remarks

When this property is set, the class will read in the data from this property instead of reading from the file contained in the FileDecompressedName property.

ZCompressData Property (ZCompress Module)

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

Syntax

• Swift
• Objective-C

public var zCompressData: String {  set {...}
}

public var zCompressDataB: Data {  set {...}
}

@property (nonatomic,readwrite,assign,getter=ZCompressData,setter=setZCompressData:) NSString* ZCompressData;

- (NSString*)ZCompressData;
- (void)setZCompressData :(NSString*)newZCompressData;

@property (nonatomic,readwrite,assign,getter=ZCompressDataB,setter=setZCompressDataB:) NSData* ZCompressDataB;

- (NSData*)ZCompressDataB;
- (void)setZCompressDataB :(NSData*)newZCompressData;

Default Value

""

Remarks

Normally you should set ArchiveFile before invoking Extract. If you prefer to read the LZC compressed file from memory you may set ZCompressData instead. ZCompressData should be set to the entire contents of the LZC compressed 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 you should set the value of FileDecompressedName to an empty string. Then, when you invoke Extract the data will be provided in the Progress event.

This property is write-only. Note that modifying a LZC compressed file stored in ZCompressData is not supported.

This property is write-only.

Abort Method (ZCompress Module)

Aborts the current operation.

Syntax

• Swift
• Objective-C

public func abort() throws -> Void

- (void)abort;

Remarks

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

Compress Method (ZCompress Module)

Creates the compressed archive.

Syntax

• Swift
• Objective-C

public func compress() throws -> Void

- (void)compress;

Remarks

Invoking Compress creates the archive specified by ArchiveFile. When the method is called, the file specified by FileDecompressedName will be opened, and the file specified by ArchiveFile will contain the compressed output.

Config Method (ZCompress Module)

Sets or retrieves a configuration setting.

Syntax

• Swift
• Objective-C

public func config(configurationString: String) throws -> String

- (NSString*)config:(NSString*)configurationString;

Remarks

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

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, 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.

Extract Method (ZCompress Module)

Extracts the compressed file from the archive.

Syntax

• Swift
• Objective-C

public func extract() throws -> Void

- (void)extract;

Remarks

Invoking Extract decompresses the archive specified by ArchiveFile. The compressed file will be extracted, and written to disk.

If FileDecompressedName is set to a nonempty string the file will be written there. Otherwise the class will automatically set FileDecompressedName to an appropriate value:

If FileDecompressedName is empty and ArchiveFile ends in ".Z", this filename, less the ".Z" extension will be used. Otherwise the extension ".uncompressed" will be appended to the file name.

Reset Method (ZCompress Module)

Resets the component.

Syntax

• Swift
• Objective-C

public func reset() throws -> Void

- (void)reset;

Remarks

Reset resets the state of the class. All properties will be set to their default values, and any files open will be closed.

BeginFile Event (ZCompress Module)

Fired before a file is processed.

Syntax

• Swift
• Objective-C

func onBeginFile(index: Int32, skip: inout Bool)

- (void)onBeginFile:(int)index :(int*)skip;

Remarks

BeginFile is fired before compression or decompression begins. Index will contain 0.

You may use the Skip parameter to tell the component to skip the file when compressing or decompressing.

EndFile Event (ZCompress Module)

Fired after a file is processed.

Syntax

• Swift
• Objective-C

func onEndFile(index: Int32)

- (void)onEndFile:(int)index;

Remarks

EndFile is fired when compression or decompression finishes. Index will contain 0.

Error Event (ZCompress Module)

Information about non-fatal errors.

Syntax

• Swift
• Objective-C

func onError(description: String, errorCode: Int32, index: Int32, filename: String, ignore: inout Bool)

- (void)onError:(NSString*)description :(int)errorCode :(int)index :(NSString*)filename :(int*)ignore;

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 class will continue operation.

ErrorCode will correspond to one of the following errors:

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 (ZCompress Module)

Fired whenever a file exists and may be overwritten.

Syntax

• Swift
• Objective-C

func onOverwrite(filename: inout String, overwrite: inout Bool)

- (void)onOverwrite:(NSString**)filename :(int*)overwrite;

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 class, 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 (ZCompress Module)

Fired as progress is made.

Syntax

• Swift
• Objective-C

func onProgress(data: Data, filename: String, bytesProcessed: Int64, percentProcessed: Int32)

- (void)onProgress:(NSData*)data :(NSString*)filename :(long long)bytesProcessed :(int)percentProcessed;

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.

Config Settings (ZCompress Module)

ZCompress Config Settings

Base Config Settings

Trappable Errors (ZCompress Module)

The following errors may be generated by the class. 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 class to continue operation even in case of error.

ZCompress Errors