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java.util.zip
Class ZipInputStream

java.lang.Object
 extended by java.io.InputStream
 extended by java.io.FilterInputStream
 extended by java.util.zip.InflaterInputStream
 extended by java.util.zip.ZipInputStream
All Implemented Interfaces:
Closeable
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.

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
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
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
Fields inherited from class java.util.zip.InflaterInputStream
buf, inf, len
Fields inherited from class java.io.FilterInputStream
in
Constructor Summary
ZipInputStream(InputStream in)
Creates a new ZIP input stream.
Method Summary
int available()
Returns 0 after EOF has reached for the current entry data, otherwise always return 1.
void close()
Closes this input stream and releases any system resources associated with the stream.
void closeEntry()
Closes the current ZIP entry and positions the stream for reading the next entry.
protected ZipEntry createZipEntry(String name)
Creates a new ZipEntry object for the specified entry name.
ZipEntry getNextEntry()
Reads the next ZIP file entry and positions the stream at the beginning of the entry data.
int read(byte[] b, int off, int len)
Reads from the current ZIP entry into an array of bytes.
long skip(long n)
Skips specified number of bytes in the current ZIP entry.
Methods inherited from class java.util.zip.InflaterInputStream
fill, mark, markSupported, read, reset
Methods inherited from class java.io.FilterInputStream
read
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOCSIG

public static final long LOCSIG
See Also:
Constant Field Values

EXTSIG

public static final long EXTSIG
See Also:
Constant Field Values

CENSIG

public static final long CENSIG
See Also:
Constant Field Values

ENDSIG

public static final long ENDSIG
See Also:
Constant Field Values

LOCHDR

public static final int LOCHDR
See Also:
Constant Field Values

EXTHDR

public static final int EXTHDR
See Also:
Constant Field Values

CENHDR

public static final int CENHDR
See Also:
Constant Field Values

ENDHDR

public static final int ENDHDR
See Also:
Constant Field Values

LOCVER

public static final int LOCVER
See Also:
Constant Field Values

LOCFLG

public static final int LOCFLG
See Also:
Constant Field Values

LOCHOW

public static final int LOCHOW
See Also:
Constant Field Values

LOCTIM

public static final int LOCTIM
See Also:
Constant Field Values

LOCCRC

public static final int LOCCRC
See Also:
Constant Field Values

LOCSIZ

public static final int LOCSIZ
See Also:
Constant Field Values

LOCLEN

public static final int LOCLEN
See Also:
Constant Field Values

LOCNAM

public static final int LOCNAM
See Also:
Constant Field Values

LOCEXT

public static final int LOCEXT
See Also:
Constant Field Values

EXTCRC

public static final int EXTCRC
See Also:
Constant Field Values

EXTSIZ

public static final int EXTSIZ
See Also:
Constant Field Values

EXTLEN

public static final int EXTLEN
See Also:
Constant Field Values

CENVEM

public static final int CENVEM
See Also:
Constant Field Values

CENVER

public static final int CENVER
See Also:
Constant Field Values

CENFLG

public static final int CENFLG
See Also:
Constant Field Values

CENHOW

public static final int CENHOW
See Also:
Constant Field Values

CENTIM

public static final int CENTIM
See Also:
Constant Field Values

CENCRC

public static final int CENCRC
See Also:
Constant Field Values

CENSIZ

public static final int CENSIZ
See Also:
Constant Field Values

CENLEN

public static final int CENLEN
See Also:
Constant Field Values

CENNAM

public static final int CENNAM
See Also:
Constant Field Values

CENEXT

public static final int CENEXT
See Also:
Constant Field Values

CENCOM

public static final int CENCOM
See Also:
Constant Field Values

CENDSK

public static final int CENDSK
See Also:
Constant Field Values

CENATT

public static final int CENATT
See Also:
Constant Field Values

CENATX

public static final int CENATX
See Also:
Constant Field Values

CENOFF

public static final int CENOFF
See Also:
Constant Field Values

ENDSUB

public static final int ENDSUB
See Also:
Constant Field Values

ENDTOT

public static final int ENDTOT
See Also:
Constant Field Values

ENDSIZ

public static final int ENDSIZ
See Also:
Constant Field Values

ENDOFF

public static final int ENDOFF
See Also:
Constant Field Values

ENDCOM

public static final int ENDCOM
See Also:
Constant Field Values
Constructor Detail

ZipInputStream

public ZipInputStream(InputStream in)
Creates a new ZIP input stream.

Parameters:
in - the actual input stream
Method Detail

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
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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