org.apache.commons.compress.archivers.tar

Class TarArchiveOutputStream

java.lang.Object

java.io.OutputStream

org.apache.commons.compress.archivers.ArchiveOutputStream

org.apache.commons.compress.archivers.tar.TarArchiveOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable

public class TarArchiveOutputStream
extends ArchiveOutputStream

The TarOutputStream writes a UNIX tar archive as an OutputStream. Methods are provided to put entries, and then write their contents by writing to this stream using write().

tar archives consist of a sequence of records of 512 bytes each that are grouped into blocks. Prior to Apache Commons Compress 1.14 it has been possible to configure a record size different from 512 bytes and arbitrary block sizes. Starting with Compress 1.15 512 is the only valid option for the record size and the block size must be a multiple of 512. Also the default block size changed from 10240 bytes prior to Compress 1.15 to 512 bytes with Compress 1.15.

Field Summary

Fields

Modifier and Type	Field and Description
static int	BIGNUMBER_ERROR Fail if a big number (e.g.
static int	BIGNUMBER_POSIX POSIX/PAX extensions are used to store big numbers in the archive.
static int	BIGNUMBER_STAR star/GNU tar/BSD tar extensions are used to store big number in the archive.
static int	LONGFILE_ERROR Fail if a long file name is required in the archive.
static int	LONGFILE_GNU GNU tar extensions are used to store long file names in the archive.
static int	LONGFILE_POSIX POSIX/PAX extensions are used to store long file names in the archive.
static int	LONGFILE_TRUNCATE Long paths will be truncated in the archive.

Constructor Summary

Constructors

Constructor and Description
TarArchiveOutputStream(java.io.OutputStream os) Constructor for TarArchiveOutputStream.
TarArchiveOutputStream(java.io.OutputStream os, int blockSize) Constructor for TarArchiveOutputStream.
TarArchiveOutputStream(java.io.OutputStream os, int blockSize, int recordSize) Deprecated. recordSize must always be 512 bytes. An IllegalArgumentException will be thrown if any other value is used
TarArchiveOutputStream(java.io.OutputStream os, int blockSize, int recordSize, java.lang.String encoding) Deprecated. recordSize must always be 512 bytes. An IllegalArgumentException will be thrown if any other value is used.
TarArchiveOutputStream(java.io.OutputStream os, int blockSize, java.lang.String encoding) Constructor for TarArchiveOutputStream.
TarArchiveOutputStream(java.io.OutputStream os, java.lang.String encoding) Constructor for TarArchiveOutputStream.

Method Summary

Modifier and Type	Method and Description
void	close() Closes the underlying OutputStream.
void	closeArchiveEntry() Close an entry.
ArchiveEntry	createArchiveEntry(java.io.File inputFile, java.lang.String entryName) Create an archive entry using the inputFile and entryName provided.
void	finish() Ends the TAR archive without closing the underlying OutputStream.
void	flush()
long	getBytesWritten() Returns the current number of bytes written to this stream.
int	getCount() Deprecated.
int	getRecordSize() Deprecated.
void	putArchiveEntry(ArchiveEntry archiveEntry) Put an entry on the output stream.
void	setAddPaxHeadersForNonAsciiNames(boolean b) Whether to add a PAX extension header for non-ASCII file names.
void	setBigNumberMode(int bigNumberMode) Set the big number mode.
void	setLongFileMode(int longFileMode) Set the long file mode.
void	write(byte[] wBuf, int wOffset, int numToWrite) Writes bytes to the current tar archive entry.

Methods inherited from class org.apache.commons.compress.archivers.ArchiveOutputStream

canWriteEntryData, write

Methods inherited from class java.io.OutputStream

write

Methods inherited from class java.lang.Object

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

Field Detail

LONGFILE_ERROR

public static final int LONGFILE_ERROR

Fail if a long file name is required in the archive.

See Also:

Constant Field Values

LONGFILE_TRUNCATE

public static final int LONGFILE_TRUNCATE

Long paths will be truncated in the archive.

See Also:

Constant Field Values

LONGFILE_GNU

public static final int LONGFILE_GNU

GNU tar extensions are used to store long file names in the archive.

See Also:

Constant Field Values

LONGFILE_POSIX

public static final int LONGFILE_POSIX

POSIX/PAX extensions are used to store long file names in the archive.

See Also:

Constant Field Values

BIGNUMBER_ERROR

public static final int BIGNUMBER_ERROR

Fail if a big number (e.g. size > 8GiB) is required in the archive.

See Also:

Constant Field Values

BIGNUMBER_STAR

public static final int BIGNUMBER_STAR

star/GNU tar/BSD tar extensions are used to store big number in the archive.

See Also:

Constant Field Values

BIGNUMBER_POSIX

public static final int BIGNUMBER_POSIX

POSIX/PAX extensions are used to store big numbers in the archive.

See Also:

Constant Field Values

Constructor Detail

TarArchiveOutputStream

public TarArchiveOutputStream(java.io.OutputStream os)

Constructor for TarArchiveOutputStream.

Uses a block size of 512 bytes.

Parameters:

os - the output stream to use

TarArchiveOutputStream

public TarArchiveOutputStream(java.io.OutputStream os,
                              java.lang.String encoding)

Constructor for TarArchiveOutputStream.

Uses a block size of 512 bytes.

Parameters:

os - the output stream to use

encoding - name of the encoding to use for file names

Since:

1.4

TarArchiveOutputStream

public TarArchiveOutputStream(java.io.OutputStream os,
                              int blockSize)

Constructor for TarArchiveOutputStream.

Parameters:

os - the output stream to use

blockSize - the block size to use. Must be a multiple of 512 bytes.

TarArchiveOutputStream

@Deprecated
public TarArchiveOutputStream(java.io.OutputStream os,
                                          int blockSize,
                                          int recordSize)

Deprecated. recordSize must always be 512 bytes. An IllegalArgumentException will be thrown if any other value is used

Constructor for TarArchiveOutputStream.

Parameters:

os - the output stream to use

blockSize - the block size to use

recordSize - the record size to use. Must be 512 bytes.

TarArchiveOutputStream

@Deprecated
public TarArchiveOutputStream(java.io.OutputStream os,
                                          int blockSize,
                                          int recordSize,
                                          java.lang.String encoding)

Deprecated. recordSize must always be 512 bytes. An IllegalArgumentException will be thrown if any other value is used.

Constructor for TarArchiveOutputStream.

Parameters:

os - the output stream to use

blockSize - the block size to use . Must be a multiple of 512 bytes.

recordSize - the record size to use. Must be 512 bytes.

encoding - name of the encoding to use for file names

Since:

1.4

TarArchiveOutputStream

public TarArchiveOutputStream(java.io.OutputStream os,
                              int blockSize,
                              java.lang.String encoding)

Constructor for TarArchiveOutputStream.

Parameters:

os - the output stream to use

blockSize - the block size to use. Must be a multiple of 512 bytes.

encoding - name of the encoding to use for file names

Since:

1.4

Method Detail

setLongFileMode

public void setLongFileMode(int longFileMode)

Set the long file mode. This can be LONGFILE_ERROR(0), LONGFILE_TRUNCATE(1) or LONGFILE_GNU(2). This specifies the treatment of long file names (names >= TarConstants.NAMELEN). Default is LONGFILE_ERROR.

Parameters:

longFileMode - the mode to use

setBigNumberMode

public void setBigNumberMode(int bigNumberMode)

Set the big number mode. This can be BIGNUMBER_ERROR(0), BIGNUMBER_POSIX(1) or BIGNUMBER_STAR(2). This specifies the treatment of big files (sizes > TarConstants.MAXSIZE) and other numeric values to big to fit into a traditional tar header. Default is BIGNUMBER_ERROR.

Parameters:

bigNumberMode - the mode to use

Since:

1.4

setAddPaxHeadersForNonAsciiNames

public void setAddPaxHeadersForNonAsciiNames(boolean b)

Whether to add a PAX extension header for non-ASCII file names.

Parameters:

b - whether to add a PAX extension header for non-ASCII file names.

Since:

1.4

getCount

@Deprecated
public int getCount()

Deprecated.

Description copied from class: ArchiveOutputStream

Returns the current number of bytes written to this stream.

Overrides:

getCount in class ArchiveOutputStream

Returns:

the number of written bytes

getBytesWritten

public long getBytesWritten()

Description copied from class: ArchiveOutputStream

Returns the current number of bytes written to this stream.

Overrides:

getBytesWritten in class ArchiveOutputStream

Returns:

the number of written bytes

finish

public void finish()
            throws java.io.IOException

Ends the TAR archive without closing the underlying OutputStream. An archive consists of a series of file entries terminated by an end-of-archive entry, which consists of two 512 blocks of zero bytes. POSIX.1 requires two EOF records, like some other implementations.

Specified by:

finish in class ArchiveOutputStream

Throws:

java.io.IOException - on error

close

public void close()
           throws java.io.IOException

Closes the underlying OutputStream.

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.OutputStream

Throws:

java.io.IOException - on error

getRecordSize

@Deprecated
public int getRecordSize()

Deprecated.

Get the record size being used by this stream's TarBuffer.

Returns:

The TarBuffer record size.

putArchiveEntry

public void putArchiveEntry(ArchiveEntry archiveEntry)
                     throws java.io.IOException

Put an entry on the output stream. This writes the entry's header record and positions the output stream for writing the contents of the entry. Once this method is called, the stream is ready for calls to write() to write the entry's contents. Once the contents are written, closeArchiveEntry() MUST be called to ensure that all buffered data is completely written to the output stream.

Specified by:

putArchiveEntry in class ArchiveOutputStream

Parameters:

archiveEntry - The TarEntry to be written to the archive.

Throws:

java.io.IOException - on error

java.lang.ClassCastException - if archiveEntry is not an instance of TarArchiveEntry

closeArchiveEntry

public void closeArchiveEntry()
                       throws java.io.IOException

Close an entry. This method MUST be called for all file entries that contain data. The reason is that we must buffer data written to the stream in order to satisfy the buffer's record based writes. Thus, there may be data fragments still being assembled that must be written to the output stream before this entry is closed and the next entry written.

Specified by:

closeArchiveEntry in class ArchiveOutputStream

Throws:

java.io.IOException - on error

write

public void write(byte[] wBuf,
                  int wOffset,
                  int numToWrite)
           throws java.io.IOException

Writes bytes to the current tar archive entry. This method is aware of the current entry and will throw an exception if you attempt to write bytes past the length specified for the current entry.

Overrides:

write in class java.io.OutputStream

Parameters:

wBuf - The buffer to write to the archive.

wOffset - The offset in the buffer from which to get bytes.

numToWrite - The number of bytes to write.

Throws:

java.io.IOException - on error

flush

public void flush()
           throws java.io.IOException

Specified by:

flush in interface java.io.Flushable

Overrides:

flush in class java.io.OutputStream

Throws:

java.io.IOException

createArchiveEntry

public ArchiveEntry createArchiveEntry(java.io.File inputFile,
                                       java.lang.String entryName)
                                throws java.io.IOException

Description copied from class: ArchiveOutputStream

Create an archive entry using the inputFile and entryName provided.

Specified by:

createArchiveEntry in class ArchiveOutputStream

Parameters:

inputFile - the file to create the entry from

entryName - name to use for the entry

Returns:

the ArchiveEntry set up with details from the file

Throws:

java.io.IOException - if an I/O error occurs