GZIPInputStream (Java Platform SE 6) (original) (raw)

java.util.zip

Class GZIPInputStream

java.lang.Object extended by java.io.InputStream extended by java.io.FilterInputStream extended by java.util.zip.InflaterInputStream extended by java.util.zip.GZIPInputStream

All Implemented Interfaces:

Closeable

public class GZIPInputStream

extends InflaterInputStream

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

See Also:

InflaterInputStream

Field Summary
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 inherited from class java.util.zip.InflaterInputStream
buf, inf, len
Fields inherited from class java.io.FilterInputStream
in
Constructor Summary
GZIPInputStream(InputStream in) Creates a new input stream with a default buffer size.
[GZIPInputStream](../../../java/util/zip/GZIPInputStream.html#GZIPInputStream%28java.io.InputStream, int%29)(InputStream in, int size) Creates a new input stream with the specified buffer size.
Method Summary
void close() Closes this input stream and releases any system resources associated with the stream.
int [read](../../../java/util/zip/GZIPInputStream.html#read%28byte[], int, int%29)(byte[] buf, int off, int len) Reads uncompressed data into an array of bytes.
Methods inherited from class java.util.zip.InflaterInputStream
available, fill, mark, markSupported, read, reset, skip
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](../../../java/lang/Object.html#wait%28long, int%29)
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:

[IOException](../../../java/io/IOException.html "class in java.io") - if an I/O error has occurred

[IllegalArgumentException](../../../java/lang/IllegalArgumentException.html "class in java.lang") - if size is <= 0

GZIPInputStream

public GZIPInputStream(InputStream in) throws IOException

Creates a new input stream with a default buffer size.

Parameters:

in - the input stream

Throws:

[IOException](../../../java/io/IOException.html "class in java.io") - 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](../../../java/util/zip/InflaterInputStream.html#read%28byte[], int, int%29) in class [InflaterInputStream](../../../java/util/zip/InflaterInputStream.html "class in java.util.zip")

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](../../../java/lang/NullPointerException.html "class in java.lang") - If buf is null.

[IndexOutOfBoundsException](../../../java/lang/IndexOutOfBoundsException.html "class in java.lang") - If off is negative, len is negative, or len is greater than buf.length - off

[IOException](../../../java/io/IOException.html "class in java.io") - if an I/O error has occurred or the compressed input data is corrupt

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](../../../java/io/Closeable.html#close%28%29) in interface [Closeable](../../../java/io/Closeable.html "interface in java.io")

Overrides:

[close](../../../java/util/zip/InflaterInputStream.html#close%28%29) in class [InflaterInputStream](../../../java/util/zip/InflaterInputStream.html "class in java.util.zip")

Throws:

[IOException](../../../java/io/IOException.html "class in java.io") - if an I/O error has occurred

See Also:

FilterInputStream.in

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