Package org.apache.commons.compress.compressors.bzip2

Class BZip2CompressorInputStream

java.lang.Object

java.io.InputStream

org.apache.commons.compress.compressors.CompressorInputStream

org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream

All Implemented Interfaces:

Closeable, AutoCloseable, InputStreamStatistics

public class BZip2CompressorInputStream
extends CompressorInputStream
implements InputStreamStatistics

An input stream that decompresses from the BZip2 format to be read as any other stream.

This class is not thread-safe

Field Summary

Fields

Modifier and Type	Field	Description
static final int	BASEBLOCKSIZE	Constant 100000.
static final int	G_SIZE	Constant 50.
static final int	MAX_ALPHA_SIZE	Constant 258.
static final int	MAX_CODE_LEN	Constant 23.
static final int	MAX_SELECTORS	Constant 18002.
static final int	N_GROUPS	Constant 6.
static final int	N_ITERS	Constant 4.
static final int	NUM_OVERSHOOT_BYTES	Constant 20.
static final int	RUNA	Constant 0.
static final int	RUNB	Constant 1.

Constructor Summary

Constructors

Constructor	Description
BZip2CompressorInputStream(InputStream in)	Constructs a new BZip2CompressorInputStream which decompresses bytes read from the specified stream.
BZip2CompressorInputStream(InputStream in, boolean decompressConcatenated)	Constructs a new BZip2CompressorInputStream which decompresses bytes read from the specified stream.

Method Summary

Modifier and Type	Method	Description
void	close()
long	getCompressedCount()	Gets the amount of raw or compressed bytes read by the stream.
static boolean	matches(byte[] signature, int length)	Checks if the signature matches what is expected for a bzip2 file.
int	read()
int	read(byte[] dest, int offs, int len)

Methods inherited from class org.apache.commons.compress.compressors.CompressorInputStream

count, count, getBytesRead, getCount, getUncompressedCount, pushedBackBytes

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.compress.utils.InputStreamStatistics

getUncompressedCount

Field Details

BASEBLOCKSIZE

static final int BASEBLOCKSIZE

Constant 100000.

See Also:

• Constant Field Values

MAX_ALPHA_SIZE

static final int MAX_ALPHA_SIZE

Constant 258.

See Also:

• Constant Field Values

MAX_CODE_LEN

static final int MAX_CODE_LEN

Constant 23.

See Also:

• Constant Field Values

RUNA

static final int RUNA

Constant 0.

See Also:

• Constant Field Values

RUNB

static final int RUNB

Constant 1.

See Also:

• Constant Field Values

N_GROUPS

static final int N_GROUPS

Constant 6.

See Also:

• Constant Field Values

G_SIZE

static final int G_SIZE

Constant 50.

See Also:

• Constant Field Values

N_ITERS

static final int N_ITERS

Constant 4.

See Also:

• Constant Field Values

MAX_SELECTORS

static final int MAX_SELECTORS

Constant 18002.

See Also:

• Constant Field Values

NUM_OVERSHOOT_BYTES

static final int NUM_OVERSHOOT_BYTES

Constant 20.

See Also:

• Constant Field Values

Constructor Details

BZip2CompressorInputStream

public BZip2CompressorInputStream(InputStream in)
                           throws IOException

Constructs a new BZip2CompressorInputStream which decompresses bytes read from the specified stream. This doesn't support decompressing concatenated .bz2 files.

Parameters:

in - the InputStream from which this object should be created

Throws:

IOException - if the stream content is malformed or an I/O error occurs.

NullPointerException - if in == null

BZip2CompressorInputStream

public BZip2CompressorInputStream(InputStream in,
 boolean decompressConcatenated)
                           throws IOException

Constructs a new BZip2CompressorInputStream which decompresses bytes read from the specified stream.

Parameters:

in - the InputStream from which this object should be created

decompressConcatenated - if true, decompress until the end of the input; if false, stop after the first .bz2 stream and leave the input position to point to the next byte after the .bz2 stream

Throws:

IOException - if in == null, the stream content is malformed, or an I/O error occurs.

Method Details

matches

public static boolean matches(byte[] signature,
 int length)

Checks if the signature matches what is expected for a bzip2 file.

Parameters:

signature - the bytes to check

length - the number of bytes to check

Returns:

true, if this stream is a bzip2 compressed stream, false otherwise

Since:

1.1

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException

getCompressedCount

public long getCompressedCount()

Description copied from interface: InputStreamStatistics

Gets the amount of raw or compressed bytes read by the stream.

Specified by:

getCompressedCount in interface InputStreamStatistics

Returns:

the amount of raw or compressed bytes read by the stream.

Since:

1.17

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

public int read(byte[] dest,
 int offs,
 int len)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException