org.apache.commons.compress.archivers.zip

Class X7875_NewUnix

java.lang.Object

org.apache.commons.compress.archivers.zip.X7875_NewUnix

All Implemented Interfaces:

Serializable, Cloneable, ZipExtraField

public class X7875_NewUnix
extends Object
implements ZipExtraField, Cloneable, Serializable

An extra field that stores UNIX UID/GID data (owner & group ownership) for a given ZIP entry. We're using the field definition given in Info-Zip's source archive: zip-3.0.tar.gz/proginfo/extrafld.txt

 Local-header version:

 Value         Size        Description
 -----         ----        -----------
 0x7875        Short       tag for this extra block type ("ux")
 TSize         Short       total data size for this block
 Version       1 byte      version of this extra field, currently 1
 UIDSize       1 byte      Size of UID field
 UID           Variable    UID for this entry (little endian)
 GIDSize       1 byte      Size of GID field
 GID           Variable    GID for this entry (little endian)

 Central-header version:

 Value         Size        Description
 -----         ----        -----------
 0x7855        Short       tag for this extra block type ("Ux")
 TSize         Short       total data size for this block (0)
 

Since:

1.5

See Also:

Serialized Form

Field Summary

Fields inherited from interface org.apache.commons.compress.archivers.zip.ZipExtraField

EXTRAFIELD_HEADER_SIZE

Constructor Summary

Constructors

Constructor and Description
X7875_NewUnix() Constructor for X7875_NewUnix.

Method Summary

Modifier and Type	Method and Description
Object	clone()
boolean	equals(Object o)
byte[]	getCentralDirectoryData() The actual data to put into central directory data - without Header-ID or length specifier.
ZipShort	getCentralDirectoryLength() Length of the extra field in the central directory data - without Header-ID or length specifier.
long	getGID() Gets the GID as a long.
ZipShort	getHeaderId() The Header-ID.
byte[]	getLocalFileDataData() The actual data to put into local file data - without Header-ID or length specifier.
ZipShort	getLocalFileDataLength() Length of the extra field in the local file data - without Header-ID or length specifier.
long	getUID() Gets the UID as a long.
int	hashCode()
void	parseFromCentralDirectoryData(byte[] buffer, int offset, int length) Doesn't do anything since this class doesn't store anything inside the central directory.
void	parseFromLocalFileData(byte[] data, int offset, int length) Populate data from this array as if it was in local file data.
void	setGID(long l) Sets the GID.
void	setUID(long l) Sets the UID.
String	toString() Returns a String representation of this class useful for debugging purposes.

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

X7875_NewUnix

public X7875_NewUnix()

Constructor for X7875_NewUnix.

Method Detail

clone

public Object clone()
             throws CloneNotSupportedException

Overrides:

clone in class Object

Throws:

CloneNotSupportedException

equals

public boolean equals(Object o)

Overrides:

equals in class Object

getCentralDirectoryData

public byte[] getCentralDirectoryData()

The actual data to put into central directory data - without Header-ID or length specifier.

Specified by:

getCentralDirectoryData in interface ZipExtraField

Returns:

get the data

getCentralDirectoryLength

public ZipShort getCentralDirectoryLength()

Length of the extra field in the central directory data - without Header-ID or length specifier.

Specified by:

getCentralDirectoryLength in interface ZipExtraField

Returns:

a ZipShort for the length of the data of this extra field

getGID

public long getGID()

Gets the GID as a long. GID is typically a 32 bit unsigned value on most UNIX systems, so we return a long to avoid integer overflow into the negatives in case values above and including 2^31 are being used.

Returns:

the GID value.

getHeaderId

public ZipShort getHeaderId()

The Header-ID.

Specified by:

getHeaderId in interface ZipExtraField

Returns:

the value for the header id for this extrafield

getLocalFileDataData

public byte[] getLocalFileDataData()

The actual data to put into local file data - without Header-ID or length specifier.

Specified by:

getLocalFileDataData in interface ZipExtraField

Returns:

get the data

getLocalFileDataLength

public ZipShort getLocalFileDataLength()

Length of the extra field in the local file data - without Header-ID or length specifier.

Specified by:

getLocalFileDataLength in interface ZipExtraField

Returns:

a ZipShort for the length of the data of this extra field

getUID

public long getUID()

Gets the UID as a long. UID is typically a 32 bit unsigned value on most UNIX systems, so we return a long to avoid integer overflow into the negatives in case values above and including 2^31 are being used.

Returns:

the UID value.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

parseFromCentralDirectoryData

public void parseFromCentralDirectoryData(byte[] buffer,
                                          int offset,
                                          int length)
                                   throws ZipException

Doesn't do anything since this class doesn't store anything inside the central directory.

Specified by:

parseFromCentralDirectoryData in interface ZipExtraField

Parameters:

buffer - the buffer to read data from

offset - offset into buffer to read data

length - the length of data

Throws:

ZipException - on error

parseFromLocalFileData

public void parseFromLocalFileData(byte[] data,
                                   int offset,
                                   int length)
                            throws ZipException

Populate data from this array as if it was in local file data.

Specified by:

parseFromLocalFileData in interface ZipExtraField

Parameters:

data - an array of bytes

offset - the start offset

length - the number of bytes in the array from offset

Throws:

ZipException - on error

setGID

public void setGID(long l)

Sets the GID.

Parameters:

l - GID value to set on this extra field.

setUID

public void setUID(long l)

Sets the UID.

Parameters:

l - UID value to set on this extra field.

toString

public String toString()

Returns a String representation of this class useful for debugging purposes.

Overrides:

toString in class Object

Returns:

A String representation of this class useful for debugging purposes.