Class GZIPInputStream

All Implemented Interfaces:
Closeable, AutoCloseable 
public class GZIPInputStream
extends InflaterInputStream

This class implements a stream filter for reading compressed data in the GZIP file format.

Since:
1.1
See Also:
InflaterInputStream

Field Summary

Fields
Modifier and Type Field Description
protected CRC32 crc

CRC-32 for uncompressed data.
protected boolean eos

Indicates end of input stream.
static int GZIP_MAGIC

GZIP header magic number.

Fields declared in class java.util.zip.InflaterInputStream

buf, inf, len

Fields declared in class java.io.FilterInputStream

in

Constructor Summary

Constructors
Constructor Description
GZIPInputStream​(InputStream in)

Creates a new input stream with a default buffer size.
GZIPInputStream​(InputStream in, int size)

Creates a new input stream with the specified buffer size.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description
void close()

Closes this input stream and releases any system resources associated with the stream.
int read​(byte[] buf, int off, int len)

Reads uncompressed data into an array of bytes.

Methods declared in class java.util.zip.InflaterInputStream

available, fill, mark, markSupported, read, reset, skip

Methods declared in class java.io.FilterInputStream

read

Methods declared in class java.io.InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, transferTo

Methods declared in class java.lang.Object

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

Field Detail

crc

protected CRC32 crc

CRC-32 for uncompressed data.

eos

protected boolean eos

Indicates end of input stream.

GZIP_MAGIC

public static final int GZIP_MAGIC

GZIP header magic number.

See Also:
Constant Field Values

Constructor Detail

GZIPInputStream

public GZIPInputStream​(InputStream in,
                       int size)
                throws IOException

Creates a new input stream with the specified buffer size.

Parameters:
in - the input stream
size - the input buffer size
Throws:
ZipException - if a GZIP format error has occurred or the compression method used is unsupported
IOException - if an I/O error has occurred
IllegalArgumentException - if size <= 0

GZIPInputStream

public GZIPInputStream​(InputStream in)
                throws IOException

Creates a new input stream with a default buffer size.

Parameters:
in - the input stream
Throws:
ZipException - if a GZIP format error has occurred or the compression method used is unsupported
IOException - if an I/O error has occurred

Method Detail

read

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

Reads uncompressed data into an array of bytes. If len is not zero, the method will block until some input can be decompressed; otherwise, no bytes are read and 0 is returned.

Overrides:
read in class InflaterInputStream
Parameters:
buf - 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 compressed input stream is reached
Throws:
NullPointerException - If buf is null.
IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than buf.length - off
ZipException - if the compressed input data is corrupt.
IOException - if an I/O error has occurred.
See Also:
FilterInputStream.in

close

public void close()
           throws IOException

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

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