class:JarInputStream [NONE]

All Implemented Interfaces:: Closeable, AutoCloseable

public class JarInputStream
extends ZipInputStream

The JarInputStream class is used to read the contents of a JAR file from any input stream. It extends the class java.util.zip.ZipInputStream with support for reading an optional Manifest entry. The Manifest can be used to store meta-information about the JAR file and its entries.

Since:: 1.2
See Also:: Manifest, ZipInputStream

field:LOCSIG [NONE]

LOCSIG

public static final long LOCSIG

See Also:: Constant Field Values

field:EXTSIG [NONE]

EXTSIG

public static final long EXTSIG

See Also:: Constant Field Values

field:CENSIG [NONE]

CENSIG

public static final long CENSIG

See Also:: Constant Field Values

field:ENDSIG [NONE]

ENDSIG

public static final long ENDSIG

See Also:: Constant Field Values

field:LOCHDR [NONE]

LOCHDR

public static final int LOCHDR

See Also:: Constant Field Values

field:EXTHDR [NONE]

EXTHDR

public static final int EXTHDR

See Also:: Constant Field Values

field:CENHDR [NONE]

CENHDR

public static final int CENHDR

See Also:: Constant Field Values

field:ENDHDR [NONE]

ENDHDR

public static final int ENDHDR

See Also:: Constant Field Values

field:LOCVER [NONE]

LOCVER

public static final int LOCVER

See Also:: Constant Field Values

field:LOCFLG [NONE]

LOCFLG

public static final int LOCFLG

See Also:: Constant Field Values

field:LOCHOW [NONE]

LOCHOW

public static final int LOCHOW

See Also:: Constant Field Values

field:LOCTIM [NONE]

LOCTIM

public static final int LOCTIM

See Also:: Constant Field Values

field:LOCCRC [NONE]

LOCCRC

public static final int LOCCRC

See Also:: Constant Field Values

field:LOCSIZ [NONE]

LOCSIZ

public static final int LOCSIZ

See Also:: Constant Field Values

field:LOCLEN [NONE]

LOCLEN

public static final int LOCLEN

See Also:: Constant Field Values

field:LOCNAM [NONE]

LOCNAM

public static final int LOCNAM

See Also:: Constant Field Values

field:LOCEXT [NONE]

LOCEXT

public static final int LOCEXT

See Also:: Constant Field Values

field:EXTCRC [NONE]

EXTCRC

public static final int EXTCRC

See Also:: Constant Field Values

field:EXTSIZ [NONE]

EXTSIZ

public static final int EXTSIZ

See Also:: Constant Field Values

field:EXTLEN [NONE]

EXTLEN

public static final int EXTLEN

See Also:: Constant Field Values

field:CENVEM [NONE]

CENVEM

public static final int CENVEM

See Also:: Constant Field Values

field:CENVER [NONE]

CENVER

public static final int CENVER

See Also:: Constant Field Values

field:CENFLG [NONE]

CENFLG

public static final int CENFLG

See Also:: Constant Field Values

field:CENHOW [NONE]

CENHOW

public static final int CENHOW

See Also:: Constant Field Values

field:CENTIM [NONE]

CENTIM

public static final int CENTIM

See Also:: Constant Field Values

field:CENCRC [NONE]

CENCRC

public static final int CENCRC

See Also:: Constant Field Values

field:CENSIZ [NONE]

CENSIZ

public static final int CENSIZ

See Also:: Constant Field Values

field:CENLEN [NONE]

CENLEN

public static final int CENLEN

See Also:: Constant Field Values

field:CENNAM [NONE]

CENNAM

public static final int CENNAM

See Also:: Constant Field Values

field:CENEXT [NONE]

CENEXT

public static final int CENEXT

See Also:: Constant Field Values

field:CENCOM [NONE]

CENCOM

public static final int CENCOM

See Also:: Constant Field Values

field:CENDSK [NONE]

CENDSK

public static final int CENDSK

See Also:: Constant Field Values

field:CENATT [NONE]

CENATT

public static final int CENATT

See Also:: Constant Field Values

field:CENATX [NONE]

CENATX

public static final int CENATX

See Also:: Constant Field Values

field:CENOFF [NONE]

CENOFF

public static final int CENOFF

See Also:: Constant Field Values

field:ENDSUB [NONE]

ENDSUB

public static final int ENDSUB

See Also:: Constant Field Values

field:ENDTOT [NONE]

ENDTOT

public static final int ENDTOT

See Also:: Constant Field Values

field:ENDSIZ [NONE]

ENDSIZ

public static final int ENDSIZ

See Also:: Constant Field Values

field:ENDOFF [NONE]

ENDOFF

public static final int ENDOFF

See Also:: Constant Field Values

field:ENDCOM [NONE]

ENDCOM

public static final int ENDCOM

See Also:: Constant Field Values

constructor:JarInputStream(java.io.InputStream) [NONE]

JarInputStream

public JarInputStream?(InputStream in) throws IOException

Creates a new JarInputStream and reads the optional manifest. If a manifest is present, also attempts to verify the signatures if the JarInputStream is signed.

Parameters:: in - the actual input stream
Throws:: IOException - if an I/O error has occurred

constructor:JarInputStream(java.io.InputStream,boolean) [NONE]

JarInputStream

public JarInputStream?(InputStream in, boolean verify) throws IOException

Creates a new JarInputStream and reads the optional manifest. If a manifest is present and verify is true, also attempts to verify the signatures if the JarInputStream is signed.

Parameters:: in - the actual input stream; verify - whether or not to verify the JarInputStream if it is signed.
Throws:: IOException - if an I/O error has occurred

method:getManifest() [NONE]

getManifest

public Manifest getManifest()

Returns the Manifest for this JAR file, or null if none.

Returns:: the Manifest for this JAR file, or null if none.

method:getNextEntry() [NONE]

getNextEntry

public ZipEntry getNextEntry() throws IOException

Reads the next ZIP file entry and positions the stream at the beginning of the entry data. If verification has been enabled, any invalid signature detected while positioning the stream for the next entry will result in an exception.

Overrides:: getNextEntry in class ZipInputStream
Returns:: the next ZIP file entry, or null if there are no more entries
Throws:: ZipException - if a ZIP file error has occurred; IOException - if an I/O error has occurred; SecurityException - if any of the jar file entries are incorrectly signed.

method:getNextJarEntry() [NONE]

getNextJarEntry

public JarEntry getNextJarEntry() throws IOException

Reads the next JAR file entry and positions the stream at the beginning of the entry data. If verification has been enabled, any invalid signature detected while positioning the stream for the next entry will result in an exception.

Returns:: the next JAR file entry, or null if there are no more entries
Throws:: ZipException - if a ZIP file error has occurred; IOException - if an I/O error has occurred; SecurityException - if any of the jar file entries are incorrectly signed.

method:read(byte[],int,int) [NONE]

read

public int read?(byte[] b, int off, int len) throws IOException

Reads from the current JAR file entry into an array of bytes. If len is not zero, the method blocks until some input is available; otherwise, no bytes are read and 0 is returned. If verification has been enabled, any invalid signature on the current entry will be reported at some point before the end of the entry is reached.

Overrides:: read in class ZipInputStream
Parameters:: b - the buffer into which the data is read; off - the start offset in the destination array b; len - the maximum number of bytes to read
Returns:: the actual number of bytes read, or -1 if the end of the entry is reached
Throws:: NullPointerException - If b is null.; IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off; ZipException - if a ZIP file error has occurred; IOException - if an I/O error has occurred; SecurityException - if any of the jar file entries are incorrectly signed.
See Also:: FilterInputStream.in

method:createZipEntry(java.lang.String) [NONE]

createZipEntry

protected ZipEntry createZipEntry?(String name)

Creates a new JarEntry (ZipEntry) for the specified JAR file entry name. The manifest attributes of the specified JAR file entry name will be copied to the new JarEntry.

Overrides:: createZipEntry in class ZipInputStream
Parameters:: name - the name of the JAR/ZIP file entry
Returns:: the JarEntry object just created