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Class ZipInputStream

All Implemented Interfaces:
Closeable, AutoCloseable
Direct Known Subclasses:
JarInputStream
public class ZipInputStream
extends InflaterInputStream

This class implements an input stream filter for reading files in the ZIP file format. Includes support for both compressed and uncompressed entries.

Fields

LOCSIG

public static final long LOCSIG

EXTSIG

public static final long EXTSIG

CENSIG

public static final long CENSIG

ENDSIG

public static final long ENDSIG

LOCHDR

public static final int LOCHDR

EXTHDR

public static final int EXTHDR

CENHDR

public static final int CENHDR

ENDHDR

public static final int ENDHDR

LOCVER

public static final int LOCVER

LOCFLG

public static final int LOCFLG

LOCHOW

public static final int LOCHOW

LOCTIM

public static final int LOCTIM

LOCCRC

public static final int LOCCRC

LOCSIZ

public static final int LOCSIZ

LOCLEN

public static final int LOCLEN

LOCNAM

public static final int LOCNAM

LOCEXT

public static final int LOCEXT

EXTCRC

public static final int EXTCRC

EXTSIZ

public static final int EXTSIZ

EXTLEN

public static final int EXTLEN

CENVEM

public static final int CENVEM

CENVER

public static final int CENVER

CENFLG

public static final int CENFLG

CENHOW

public static final int CENHOW

CENTIM

public static final int CENTIM

CENCRC

public static final int CENCRC

CENSIZ

public static final int CENSIZ

CENLEN

public static final int CENLEN

CENNAM

public static final int CENNAM

CENEXT

public static final int CENEXT

CENCOM

public static final int CENCOM

CENDSK

public static final int CENDSK

CENATT

public static final int CENATT

CENATX

public static final int CENATX

CENOFF

public static final int CENOFF

ENDSUB

public static final int ENDSUB

ENDTOT

public static final int ENDTOT

ENDSIZ

public static final int ENDSIZ

ENDOFF

public static final int ENDOFF

ENDCOM

public static final int ENDCOM

Constructors

ZipInputStream

public ZipInputStream(InputStream in)

Creates a new ZIP input stream.

The UTF-8 charset is used to decode the entry names.

Parameters:
in - the actual input stream

ZipInputStream

public ZipInputStream(InputStream in,
                      Charset charset)

Creates a new ZIP input stream.

Parameters:
in - the actual input stream
charset - The charset to be used to decode the ZIP entry name (ignored if the language encoding bit of the ZIP entry's general purpose bit flag is set).
Since:
1.7

Methods

getNextEntry

public ZipEntry getNextEntry()
                      throws IOException

Reads the next ZIP file entry and positions the stream at the beginning of the entry data.

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

closeEntry

public void closeEntry()
                throws IOException

Closes the current ZIP entry and positions the stream for reading the next entry.

Throws:
ZipException - if a ZIP file error has occurred
IOException - if an I/O error has occurred

available

public int available()
              throws IOException

Returns 0 after EOF has reached for the current entry data, otherwise always return 1.

Programs should not count on this method to return the actual number of bytes that could be read without blocking.

Overrides:
available in class InflaterInputStream
Returns:
1 before EOF and 0 after EOF has reached for current entry.
Throws:
IOException - if an I/O error occurs.

read

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

Reads from the current ZIP 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.

Overrides:
read in class InflaterInputStream
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 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
See Also:
FilterInputStream.in

skip

public long skip(long n)
          throws IOException

Skips specified number of bytes in the current ZIP entry.

Overrides:
skip in class InflaterInputStream
Parameters:
n - the number of bytes to skip
Returns:
the actual number of bytes skipped
Throws:
ZipException - if a ZIP file error has occurred
IOException - if an I/O error has occurred
IllegalArgumentException - if n < 0

close

public void close()
           throws IOException

Closes this input stream and releases any system resources associated with the stream.

Specified by:
close in interface Closeable
Specified by:
close in interface AutoCloseable
Overrides:
close in class InflaterInputStream
Throws:
IOException - if an I/O error has occurred
See Also:
FilterInputStream.in

createZipEntry

protected ZipEntry createZipEntry(String name)

Creates a new ZipEntry object for the specified entry name.

Parameters:
name - the ZIP file entry name
Returns:
the ZipEntry just created

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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