Class OpenJDK7GZIPInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

org.archive.util.zip.OpenJDK7InflaterInputStream

org.archive.util.zip.OpenJDK7GZIPInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

GZIPMembersInputStream, MultiMemberOpenJDKGZIPInputStream

public class OpenJDK7GZIPInputStream
extends OpenJDK7InflaterInputStream

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

Author:

David Connelly

See Also:

• OpenJDK7InflaterInputStream

Field Summary

Fields

Modifier and Type	Field	Description
protected CRC32	crc	CRC-32 for uncompressed data.
protected boolean	eos	Indicates end of input stream.
protected static final int	FCOMMENT
protected static final int	FEXTRA
protected static final int	FHCRC
protected static final int	FNAME
protected static final int	FTEXT
static final int	GZIP_MAGIC	GZIP header magic number.

Fields inherited from class org.archive.util.zip.OpenJDK7InflaterInputStream

buf, inf, len, usesDefaultInflater

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor	Description
OpenJDK7GZIPInputStream(InputStream in)	Creates a new input stream with a default buffer size.
OpenJDK7GZIPInputStream(InputStream in, int size)	Creates a new input stream with the specified buffer size.

Method Summary

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.
protected int	readHeader(InputStream this_in)
protected boolean	readTrailer()
protected int	readUByte(InputStream in)
protected long	readUInt(InputStream in)
protected int	readUShort(InputStream in)
protected void	skipBytes(InputStream in, int n)

Methods inherited from class org.archive.util.zip.OpenJDK7InflaterInputStream

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

Field Details

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

FTEXT

protected static final int FTEXT

See Also:

• Constant Field Values

FHCRC

protected static final int FHCRC

See Also:

• Constant Field Values

FEXTRA

protected static final int FEXTRA

See Also:

• Constant Field Values

FNAME

protected static final int FNAME

See Also:

• Constant Field Values

FCOMMENT

protected static final int FCOMMENT

See Also:

• Constant Field Values

Constructor Details

OpenJDK7GZIPInputStream

public OpenJDK7GZIPInputStream(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 is <= 0

OpenJDK7GZIPInputStream

public OpenJDK7GZIPInputStream(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 Details

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 OpenJDK7InflaterInputStream

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.

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 OpenJDK7InflaterInputStream

Throws:

IOException - if an I/O error has occurred

readHeader

protected int readHeader(InputStream this_in)
                  throws IOException

Throws:

IOException

readTrailer

protected boolean readTrailer()
                       throws IOException

Throws:

IOException

readUInt

protected long readUInt(InputStream in)
                 throws IOException

Throws:

IOException

readUShort

protected int readUShort(InputStream in)
                  throws IOException

Throws:

IOException

readUByte

protected int readUByte(InputStream in)
                 throws IOException

Throws:

IOException

skipBytes

protected void skipBytes(InputStream in,
 int n)
                  throws IOException

Throws:

IOException