Package org.apache.commons.compress.archivers.zip

Class Zip64ExtendedInformationExtraField

java.lang.Object

org.apache.commons.compress.archivers.zip.Zip64ExtendedInformationExtraField

All Implemented Interfaces:

ZipExtraField

public class Zip64ExtendedInformationExtraField
extends java.lang.Object
implements ZipExtraField

Holds size and other extended information for entries that use Zip64 features.

Currently Commons Compress doesn't support encrypting the central directory so the note in APPNOTE.TXT about masking doesn't apply.

The implementation relies on data being read from the local file header and assumes that both size values are always present.

Since:

1.2

See Also:

PKWARE APPNOTE.TXT, section 4.5.3

Field Summary

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

EXTRAFIELD_HEADER_SIZE

Constructor Summary

Constructors

Constructor	Description
Zip64ExtendedInformationExtraField()	This constructor should only be used by the code that reads archives inside of Commons Compress.
Zip64ExtendedInformationExtraField(ZipEightByteInteger size, ZipEightByteInteger compressedSize)	Creates an extra field based on the original and compressed size.
Zip64ExtendedInformationExtraField(ZipEightByteInteger size, ZipEightByteInteger compressedSize, ZipEightByteInteger relativeHeaderOffset, ZipLong diskStart)	Creates an extra field based on all four possible values.

Method Summary

Modifier and Type	Method	Description
byte[]	getCentralDirectoryData()	The actual data to put into central directory - without Header-ID or length specifier.
ZipShort	getCentralDirectoryLength()	Length of the extra field in the central directory - without Header-ID or length specifier.
ZipEightByteInteger	getCompressedSize()	The compressed size stored in this extra field.
ZipLong	getDiskStartNumber()	The disk start number stored in this extra field.
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.
ZipEightByteInteger	getRelativeHeaderOffset()	The relative header offset stored in this extra field.
ZipEightByteInteger	getSize()	The uncompressed size stored in this extra field.
void	parseFromCentralDirectoryData(byte[] buffer, int offset, int length)	Populate data from this array as if it was in central directory data.
void	parseFromLocalFileData(byte[] buffer, int offset, int length)	Populate data from this array as if it was in local file data.
void	reparseCentralDirectoryData(boolean hasUncompressedSize, boolean hasCompressedSize, boolean hasRelativeHeaderOffset, boolean hasDiskStart)	Parses the raw bytes read from the central directory extra field with knowledge which fields are expected to be there.
void	setCompressedSize(ZipEightByteInteger compressedSize)	The uncompressed size stored in this extra field.
void	setDiskStartNumber(ZipLong ds)	The disk start number stored in this extra field.
void	setRelativeHeaderOffset(ZipEightByteInteger rho)	The relative header offset stored in this extra field.
void	setSize(ZipEightByteInteger size)	The uncompressed size stored in this extra field.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Zip64ExtendedInformationExtraField

public Zip64ExtendedInformationExtraField()

This constructor should only be used by the code that reads archives inside of Commons Compress.

Zip64ExtendedInformationExtraField

public Zip64ExtendedInformationExtraField(ZipEightByteInteger size,
                                          ZipEightByteInteger compressedSize)

Creates an extra field based on the original and compressed size.

Parameters:

size - the entry's original size

compressedSize - the entry's compressed size

Throws:

java.lang.IllegalArgumentException - if size or compressedSize is null

Zip64ExtendedInformationExtraField

public Zip64ExtendedInformationExtraField(ZipEightByteInteger size,
                                          ZipEightByteInteger compressedSize,
                                          ZipEightByteInteger relativeHeaderOffset,
                                          ZipLong diskStart)

Creates an extra field based on all four possible values.

Parameters:

size - the entry's original size

compressedSize - the entry's compressed size

relativeHeaderOffset - the entry's offset

diskStart - the disk start

Throws:

java.lang.IllegalArgumentException - if size or compressedSize is null

Method Detail

getCentralDirectoryData

public byte[] getCentralDirectoryData()

Description copied from interface: ZipExtraField

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

Specified by:

getCentralDirectoryData in interface ZipExtraField

Returns:

the data

getCentralDirectoryLength

public ZipShort getCentralDirectoryLength()

Description copied from interface: ZipExtraField

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

Specified by:

getCentralDirectoryLength in interface ZipExtraField

Returns:

the length of the field in the central directory

getCompressedSize

public ZipEightByteInteger getCompressedSize()

The compressed size stored in this extra field.

Returns:

The compressed size stored in this extra field.

getDiskStartNumber

public ZipLong getDiskStartNumber()

The disk start number stored in this extra field.

Returns:

The disk start number stored in this extra field.

getHeaderId

public ZipShort getHeaderId()

Description copied from interface: ZipExtraField

The Header-ID.

Specified by:

getHeaderId in interface ZipExtraField

Returns:

The HeaderId value

getLocalFileDataData

public byte[] getLocalFileDataData()

Description copied from interface: ZipExtraField

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

Specified by:

getLocalFileDataData in interface ZipExtraField

Returns:

the data

getLocalFileDataLength

public ZipShort getLocalFileDataLength()

Description copied from interface: ZipExtraField

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

Specified by:

getLocalFileDataLength in interface ZipExtraField

Returns:

the length of the field in the local file data

getRelativeHeaderOffset

public ZipEightByteInteger getRelativeHeaderOffset()

The relative header offset stored in this extra field.

Returns:

The relative header offset stored in this extra field.

getSize

public ZipEightByteInteger getSize()

The uncompressed size stored in this extra field.

Returns:

The uncompressed size stored in this extra field.

parseFromCentralDirectoryData

public void parseFromCentralDirectoryData(byte[] buffer,
                                          int offset,
                                          int length)
                                   throws java.util.zip.ZipException

Description copied from interface: ZipExtraField

Populate data from this array as if it was in central directory data.

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:

java.util.zip.ZipException - on error

parseFromLocalFileData

public void parseFromLocalFileData(byte[] buffer,
                                   int offset,
                                   int length)
                            throws java.util.zip.ZipException

Description copied from interface: ZipExtraField

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

Specified by:

parseFromLocalFileData in interface ZipExtraField

Parameters:

buffer - the buffer to read data from

offset - offset into buffer to read data

length - the length of data

Throws:

java.util.zip.ZipException - on error

reparseCentralDirectoryData

public void reparseCentralDirectoryData(boolean hasUncompressedSize,
                                        boolean hasCompressedSize,
                                        boolean hasRelativeHeaderOffset,
                                        boolean hasDiskStart)
                                 throws java.util.zip.ZipException

Parses the raw bytes read from the central directory extra field with knowledge which fields are expected to be there.

All four fields inside the zip64 extended information extra field are optional and must only be present if their corresponding entry inside the central directory contains the correct magic value.

Parameters:

hasUncompressedSize - flag to read from central directory

hasCompressedSize - flag to read from central directory

hasRelativeHeaderOffset - flag to read from central directory

hasDiskStart - flag to read from central directory

Throws:

java.util.zip.ZipException - on error

setCompressedSize

public void setCompressedSize(ZipEightByteInteger compressedSize)

The uncompressed size stored in this extra field.

Parameters:

compressedSize - The uncompressed size stored in this extra field.

setDiskStartNumber

public void setDiskStartNumber(ZipLong ds)

The disk start number stored in this extra field.

Parameters:

ds - The disk start number stored in this extra field.

setRelativeHeaderOffset

public void setRelativeHeaderOffset(ZipEightByteInteger rho)

The relative header offset stored in this extra field.

Parameters:

rho - The relative header offset stored in this extra field.

setSize

public void setSize(ZipEightByteInteger size)

The uncompressed size stored in this extra field.

Parameters:

size - The uncompressed size stored in this extra field.