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:

java.io.Closeable, java.lang.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.

Field Summary

Fields

Modifier and Type	Field and Description
static int	BASEBLOCKSIZE
static int	G_SIZE
static int	MAX_ALPHA_SIZE
static int	MAX_CODE_LEN
static int	MAX_SELECTORS
static int	N_GROUPS
static int	N_ITERS
static int	NUM_OVERSHOOT_BYTES
static int	RUNA
static int	RUNB

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	close()
long	getCompressedCount()
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

getBytesRead, getCount, getUncompressedCount

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

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

getUncompressedCount

Field Detail

BASEBLOCKSIZE

public static final int BASEBLOCKSIZE

See Also:

Constant Field Values

MAX_ALPHA_SIZE

public static final int MAX_ALPHA_SIZE

See Also:

Constant Field Values

MAX_CODE_LEN

public static final int MAX_CODE_LEN

See Also:

Constant Field Values

RUNA

public static final int RUNA

See Also:

Constant Field Values

RUNB

public static final int RUNB

See Also:

Constant Field Values

N_GROUPS

public static final int N_GROUPS

See Also:

Constant Field Values

G_SIZE

public static final int G_SIZE

See Also:

Constant Field Values

N_ITERS

public static final int N_ITERS

See Also:

Constant Field Values

MAX_SELECTORS

public static final int MAX_SELECTORS

See Also:

Constant Field Values

NUM_OVERSHOOT_BYTES

public static final int NUM_OVERSHOOT_BYTES

See Also:

Constant Field Values

Constructor Detail

BZip2CompressorInputStream

public BZip2CompressorInputStream(java.io.InputStream in)
                           throws java.io.IOException

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

Parameters:

in - the InputStream from which this object should be created

Throws:

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

java.lang.NullPointerException - if in == null

BZip2CompressorInputStream

public BZip2CompressorInputStream(java.io.InputStream in,
                                  boolean decompressConcatenated)
                           throws java.io.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:

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

Method Detail

read

public int read()
         throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

read

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

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

getCompressedCount

public long getCompressedCount()

Specified by:

getCompressedCount in interface InputStreamStatistics

Returns:

the amount of raw or compressed bytes read by the stream

Since:

1.17

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException

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