java.util.zip
Class ZipFile

java.lang.Object
  java.util.zip.ZipFile

All Implemented Interfaces:

ZipConstants

Direct Known Subclasses:

JarFile

public class ZipFile

extends Object

implements ZipConstants

This class is used to read entries from a zip file.

Author:

David Connelly

Nested Class Summary

private class

ZipFile.ZipFileInputStream

Field Summary

static int	CENATT
static int	CENATX
static int	CENCOM
static int	CENCRC
static int	CENDSK
static int	CENEXT
static int	CENFLG
static int	CENHDR
static int	CENHOW
static int	CENLEN
static int	CENNAM
static int	CENOFF
static long	CENSIG
static int	CENSIZ
static int	CENTIM
static int	CENVEM
static int	CENVER
private static int	DEFLATED
static int	ENDCOM
static int	ENDHDR
static int	ENDOFF
static long	ENDSIG
static int	ENDSIZ
static int	ENDSUB
static int	ENDTOT
static int	EXTCRC
static int	EXTHDR
static int	EXTLEN
static long	EXTSIG
static int	EXTSIZ
private Vector	inflaters
private long	jzfile
static int	LOCCRC
static int	LOCEXT
static int	LOCFLG
static int	LOCHDR
static int	LOCHOW
static int	LOCLEN
static int	LOCNAM
static long	LOCSIG
static int	LOCSIZ
static int	LOCTIM
static int	LOCVER
private String	name
static int	OPEN_DELETE Mode flag to open a zip file and mark it for deletion.
static int	OPEN_READ Mode flag to open a zip file for reading.
private static int	STORED
private int	total

Constructor Summary

ZipFile(File file)
Opens a ZIP file for reading given the specified File object.

ZipFile(File file, int mode)
Opens a new ZipFile to read from the specified File object in the specified mode.

ZipFile(String name)
Opens a zip file for reading.

Method Summary

void	close() Closes the ZIP file.
private static void	close(long jzfile)
private void	ensureOpen(long fd)
Enumeration	entries() Returns an enumeration of the ZIP file entries.
protected void	finalize() Ensures that the close method of this ZIP file is called when there are no more references to it.
private static void	freeEntry(long jzfile, long jzentry)
private static int	getCSize(long jzentry)
private static long	getEntry(long jzfile, String name)
ZipEntry	getEntry(String name) Returns the zip file entry for the specified name, or null if not found.
private Inflater	getInflater()
private InputStream	getInputStream(String name) Returns an input stream for reading the contents of the specified entry, or null if the entry was not found.
InputStream	getInputStream(ZipEntry entry) Returns an input stream for reading the contents of the specified zip file entry.
private static int	getMethod(long jzentry)
String	getName() Returns the path name of the ZIP file.
private static long	getNextEntry(long jzfile, int i)
private static int	getSize(long jzentry)
private static int	getTotal(long jzfile)
private static String	getZipMessage(long jzfile)
private static void	initIDs()
private static long	open(String name, int mode, long lastModified)
private static int	read(long jzfile, long jzentry, int pos, byte[] b, int off, int len)
private void	releaseInflater(Inflater inf)
int	size() Returns the number of entries in the ZIP file.

Methods inherited from class java.lang.Object

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

Field Detail

jzfile

private long jzfile

name

private String name

total

private int total

STORED

private static final int STORED

See Also:

Constant Field Values

DEFLATED

private static final int DEFLATED

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Constant Field Values

OPEN_READ

public static final int OPEN_READ

Mode flag to open a zip file for reading.

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Constant Field Values

OPEN_DELETE

public static final int OPEN_DELETE

Mode flag to open a zip file and mark it for deletion. The file will be deleted some time between the moment that it is opened and the moment that it is closed, but its contents will remain accessible via the ZipFile object until either the close method is invoked or the virtual machine exits.

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Constant Field Values

inflaters

private Vector inflaters

LOCSIG

public static final long LOCSIG

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Constant Field Values

EXTSIG

public static final long EXTSIG

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Constant Field Values

CENSIG

public static final long CENSIG

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Constant Field Values

ENDSIG

public static final long ENDSIG

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Constant Field Values

LOCHDR

public static final int LOCHDR

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Constant Field Values

EXTHDR

public static final int EXTHDR

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Constant Field Values

CENHDR

public static final int CENHDR

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Constant Field Values

ENDHDR

public static final int ENDHDR

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Constant Field Values

LOCVER

public static final int LOCVER

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Constant Field Values

LOCFLG

public static final int LOCFLG

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Constant Field Values

LOCHOW

public static final int LOCHOW

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Constant Field Values

LOCTIM

public static final int LOCTIM

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Constant Field Values

LOCCRC

public static final int LOCCRC

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Constant Field Values

LOCSIZ

public static final int LOCSIZ

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Constant Field Values

LOCLEN

public static final int LOCLEN

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Constant Field Values

LOCNAM

public static final int LOCNAM

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Constant Field Values

LOCEXT

public static final int LOCEXT

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Constant Field Values

EXTCRC

public static final int EXTCRC

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Constant Field Values

EXTSIZ

public static final int EXTSIZ

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Constant Field Values

EXTLEN

public static final int EXTLEN

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Constant Field Values

CENVEM

public static final int CENVEM

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Constant Field Values

CENVER

public static final int CENVER

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Constant Field Values

CENFLG

public static final int CENFLG

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Constant Field Values

CENHOW

public static final int CENHOW

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Constant Field Values

CENTIM

public static final int CENTIM

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Constant Field Values

CENCRC

public static final int CENCRC

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Constant Field Values

CENSIZ

public static final int CENSIZ

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Constant Field Values

CENLEN

public static final int CENLEN

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Constant Field Values

CENNAM

public static final int CENNAM

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Constant Field Values

CENEXT

public static final int CENEXT

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Constant Field Values

CENCOM

public static final int CENCOM

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Constant Field Values

CENDSK

public static final int CENDSK

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Constant Field Values

CENATT

public static final int CENATT

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Constant Field Values

CENATX

public static final int CENATX

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Constant Field Values

CENOFF

public static final int CENOFF

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Constant Field Values

ENDSUB

public static final int ENDSUB

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Constant Field Values

ENDTOT

public static final int ENDTOT

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Constant Field Values

ENDSIZ

public static final int ENDSIZ

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ENDOFF

public static final int ENDOFF

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Constant Field Values

ENDCOM

public static final int ENDCOM

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Constant Field Values

Constructor Detail

ZipFile

public ZipFile(String name)
        throws IOException

Opens a zip file for reading.

First, if there is a security manager, its checkRead method is called with the name argument as its argument to ensure the read is allowed.

Parameters:

name - the name of the zip file

Throws:

ZipException - if a ZIP format error has occurred

IOException - if an I/O error has occurred

SecurityException - if a security manager exists and its checkRead method doesn't allow read access to the file.

See Also:

SecurityManager.checkRead(java.lang.String)

ZipFile

public ZipFile(File file,
               int mode)
        throws IOException

Opens a new ZipFile to read from the specified File object in the specified mode. The mode argument must be either OPEN_READ or OPEN_READ | OPEN_DELETE.

First, if there is a security manager, its checkRead method is called with the name argument as its argument to ensure the read is allowed.

Parameters:

file - the ZIP file to be opened for reading

mode - the mode in which the file is to be opened

Throws:

ZipException - if a ZIP format error has occurred

IOException - if an I/O error has occurred

SecurityException - if a security manager exists and its checkRead method doesn't allow read access to the file, or checkDelete method doesn't allow deleting the file when OPEN_DELETE flag is set.

IllegalArgumentException - If the mode argument is invalid

See Also:

SecurityManager.checkRead(java.lang.String)

ZipFile

public ZipFile(File file)
        throws ZipException,
               IOException

Opens a ZIP file for reading given the specified File object.

Parameters:

file - the ZIP file to be opened for reading

Throws:

ZipException - if a ZIP error has occurred

IOException - if an I/O error has occurred

Method Detail

initIDs

private static void initIDs()

open

private static long open(String name,
                         int mode,
                         long lastModified)

getTotal

private static int getTotal(long jzfile)

getEntry

public ZipEntry getEntry(String name)

Returns the zip file entry for the specified name, or null if not found.

Parameters:

name - the name of the entry

Returns:

the zip file entry, or null if not found

Throws:

IllegalStateException - if the zip file has been closed

getEntry

private static long getEntry(long jzfile,
                             String name)

freeEntry

private static void freeEntry(long jzfile,
                              long jzentry)

getInputStream

public InputStream getInputStream(ZipEntry entry)
                           throws IOException

Returns an input stream for reading the contents of the specified zip file entry. Returns an input stream for reading the contents of the specified zip file entry.

Closing this ZIP file will, in turn, close all input streams that have been returned by invocations of this method.

Parameters:

entry - the zip file entry

Returns:

the input stream for reading the contents of the specified zip file entry.

Throws:

ZipException - if a ZIP format error has occurred

IOException - if an I/O error has occurred

IllegalStateException - if the zip file has been closed

getInputStream

private InputStream getInputStream(String name)
                            throws IOException

Returns an input stream for reading the contents of the specified entry, or null if the entry was not found.

Throws:

IOException

getMethod

private static int getMethod(long jzentry)

getInflater

private Inflater getInflater()

releaseInflater

private void releaseInflater(Inflater inf)

getName

public String getName()

Returns the path name of the ZIP file.

Returns:

the path name of the ZIP file

entries

public Enumeration entries()

Returns an enumeration of the ZIP file entries.

Returns:

an enumeration of the ZIP file entries

Throws:

IllegalStateException - if the zip file has been closed

getNextEntry

private static long getNextEntry(long jzfile,
                                 int i)

size

public int size()

Returns the number of entries in the ZIP file.

Returns:

the number of entries in the ZIP file

Throws:

IllegalStateException - if the zip file has been closed

close

public void close()
           throws IOException

Closes the ZIP file.

Closing this ZIP file will close all of the input streams previously returned by invocations of the getInputStream method.

Throws:

IOException - if an I/O error has occured

finalize

protected void finalize()
                 throws IOException

Ensures that the close method of this ZIP file is called when there are no more references to it.

Since the time when GC would invoke this method is undetermined, it is strongly recommanded that applications invoke the close method as soon they have finished accessing this ZipFile. This will prevent holding up system resources for an undetermined length of time.

Overrides:

finalize in class Object

Throws:

IOException - if an I/O error occurs.

See Also:

close()

close

private static void close(long jzfile)

ensureOpen

private void ensureOpen(long fd)

read

private static int read(long jzfile,
                        long jzentry,
                        int pos,
                        byte[] b,
                        int off,
                        int len)

getCSize

private static int getCSize(long jzentry)

getSize

private static int getSize(long jzentry)

getZipMessage

private static String getZipMessage(long jzfile)