Class ZipInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

net.sf.jazzlib.InflaterInputStream

net.sf.jazzlib.ZipInputStream

All Implemented Interfaces:

Closeable, AutoCloseable, ZipConstants

public class ZipInputStream
extends InflaterInputStream
implements ZipConstants

This is a FilterInputStream that reads the files in an zip archive one after another. It has a special method to get the zip entry of the next file. The zip entry contains information about the file name size, compressed size, CRC, etc. It includes support for STORED and DEFLATED entries.

Field Summary

Fields

Modifier and Type	Field	Description
private int	avail
private CRC32	crc
private int	csize
private ZipEntry	entry
private boolean	entryAtEOF
private int	flags
private int	method
private int	size

Fields inherited from class InflaterInputStream

buf, inf, len

Fields inherited from class FilterInputStream

in

Fields inherited from interface ZipConstants

CENATT, CENATX, CENCOM, CENCRC, CENDSK, CENEXT, CENFLG, CENHDR, CENHOW, CENLEN, CENNAM, CENOFF, CENSIG, CENSIZ, CENTIM, CENVEM, CENVER, ENDCOM, ENDDCD, ENDHDR, ENDNRD, ENDOFF, ENDSIG, ENDSIZ, ENDSUB, ENDTOT, EXTCRC, EXTHDR, EXTLEN, EXTSIG, EXTSIZ, LOCCRC, LOCEXT, LOCFLG, LOCHDR, LOCHOW, LOCLEN, LOCNAM, LOCSIG, LOCSIZ, LOCTIM, LOCVER

Constructor Summary

Constructors

Constructor	Description
ZipInputStream(InputStream in)	Creates a new Zip input stream, reading a zip archive.

Method Summary

Modifier and Type	Method	Description
int	available()	Returns 0 once the end of the stream (EOF) has been reached.
void	close()	Closes the zip file.
void	closeEntry()	Closes the current zip entry and moves to the next one.
protected ZipEntry	createZipEntry(String name)	Creates a new zip entry for the given name.
private void	fillBuf()
ZipEntry	getNextEntry()	Open the next entry from the zip archive, and return its description.
int	read()	Reads a byte from the current zip entry.
int	read(byte[] b, int off, int len)	Reads a block of bytes from the current zip entry.
private int	readBuf(byte[] out, int offset, int length)
private void	readDataDescr()
private void	readFully(byte[] out)
private final int	readLeByte()
private final int	readLeInt()	Read an int in little endian byte order.
private final int	readLeShort()	Read an unsigned short in little endian byte order.

Methods inherited from class InflaterInputStream

fill, skip

Methods inherited from class FilterInputStream

mark, markSupported, read, reset

Methods inherited from class InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo

Methods inherited from class Object

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

Field Details

crc

private CRC32 crc

entry

private ZipEntry entry

csize

private int csize

size

private int size

method

private int method

flags

private int flags

avail

private int avail

entryAtEOF

private boolean entryAtEOF

Constructor Details

ZipInputStream

public ZipInputStream(InputStream in)

Creates a new Zip input stream, reading a zip archive.

Method Details

fillBuf

private void fillBuf()
              throws IOException

Throws:

IOException

readBuf

private int readBuf(byte[] out,
 int offset,
 int length)
             throws IOException

Throws:

IOException

readFully

private void readFully(byte[] out)
                throws IOException

Throws:

IOException

readLeByte

private final int readLeByte()
                      throws IOException

Throws:

IOException

readLeShort

private final int readLeShort()
                       throws IOException

Read an unsigned short in little endian byte order.

Throws:

IOException

readLeInt

private final int readLeInt()
                     throws IOException

Read an int in little endian byte order.

Throws:

IOException

getNextEntry

public ZipEntry getNextEntry()
                      throws IOException

Open the next entry from the zip archive, and return its description. If the previous entry wasn't closed, this method will close it.

Throws:

IOException

readDataDescr

private void readDataDescr()
                    throws IOException

Throws:

IOException

closeEntry

public void closeEntry()
                throws IOException

Closes the current zip entry and moves to the next one.

Throws:

IOException

available

public int available()
              throws IOException

Description copied from class: InflaterInputStream

Returns 0 once the end of the stream (EOF) has been reached. Otherwise returns 1.

Overrides:

available in class InflaterInputStream

Throws:

IOException

read

public int read()
         throws IOException

Reads a byte from the current zip entry.

Overrides:

read in class InflaterInputStream

Returns:

the byte or -1 on EOF.

Throws:

IOException - if a i/o error occured.

ZipException - if the deflated stream is corrupted.

read

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

Reads a block of bytes from the current zip entry.

Overrides:

read in class InflaterInputStream

Parameters:

b - the array to read and decompress data into

off - the offset indicating where the data should be placed

len - the number of bytes to decompress

Returns:

the number of bytes read (may be smaller, even before EOF), or -1 on EOF.

Throws:

IOException - if a i/o error occured.

ZipException - if the deflated stream is corrupted.

close

public void close()
           throws IOException

Closes the zip file.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class InflaterInputStream

Throws:

IOException - if a i/o error occured.

createZipEntry

protected ZipEntry createZipEntry(String name)

Creates a new zip entry for the given name. This is equivalent to new ZipEntry(name).

Parameters:

name - the name of the zip entry.