Package org.apache.commons.compress.archivers.tar

Class TarArchiveOutputStream

java.lang.Object

java.io.OutputStream

org.apache.commons.compress.archivers.ArchiveOutputStream<TarArchiveEntry>

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

All Implemented Interfaces:

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

public class TarArchiveOutputStream
extends ArchiveOutputStream<TarArchiveEntry>

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	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	Description
TarArchiveOutputStream(java.io.OutputStream os)	Constructs a new instance.
TarArchiveOutputStream(java.io.OutputStream os, int blockSize)	Constructs a new instance.
TarArchiveOutputStream(java.io.OutputStream os, int blockSize, int recordSize)	Deprecated. recordSize must always be 512 bytes.
TarArchiveOutputStream(java.io.OutputStream os, int blockSize, int recordSize, java.lang.String encoding)	Deprecated. recordSize must always be 512 bytes.
TarArchiveOutputStream(java.io.OutputStream os, int blockSize, java.lang.String encoding)	Constructs a new instance.
TarArchiveOutputStream(java.io.OutputStream os, java.lang.String encoding)	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes the underlying OutputStream.
void	closeArchiveEntry()	Closes an entry.
TarArchiveEntry	createArchiveEntry(java.io.File inputFile, java.lang.String entryName)	Creates an archive entry using the inputFile and entryName provided.
TarArchiveEntry	createArchiveEntry(java.nio.file.Path inputPath, java.lang.String entryName, java.nio.file.LinkOption... options)	Creates an archive entry using the inputPath and entryName provided.
void	finish()	Finishes the TAR archive without closing the underlying OutputStream.
void	flush()
long	getBytesWritten()	Gets the current number of bytes written to this stream.
int	getCount()	Deprecated.
int	getRecordSize()	Deprecated.
void	putArchiveEntry(TarArchiveEntry archiveEntry)	Puts an entry on the output stream.
void	setAddPaxHeadersForNonAsciiNames(boolean b)	Sets whether to add a PAX extension header for non-ASCII file names.
void	setBigNumberMode(int bigNumberMode)	Sets the big number mode.
void	setLongFileMode(int longFileMode)	Sets 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

nullOutputStream, 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)

Constructs a new instance.

Uses a block size of 512 bytes.

Parameters:

os - the output stream to use

TarArchiveOutputStream

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

Constructs a new instance.

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

Constructs a new instance.

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.

Constructs a new instance.

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)

Constructs a new instance.

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

TarArchiveOutputStream

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

Constructs a new instance.

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

Method Detail

close

public void close()
           throws java.io.IOException

Closes the underlying OutputStream.

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.OutputStream

Throws:

java.io.IOException - on error

closeArchiveEntry

public void closeArchiveEntry()
                       throws java.io.IOException

Closes 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<TarArchiveEntry>

Throws:

java.io.IOException - on error

createArchiveEntry

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

Description copied from class: ArchiveOutputStream

Creates an archive entry using the inputFile and entryName provided.

Specified by:

createArchiveEntry in class ArchiveOutputStream<TarArchiveEntry>

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

createArchiveEntry

public TarArchiveEntry createArchiveEntry(java.nio.file.Path inputPath,
                                          java.lang.String entryName,
                                          java.nio.file.LinkOption... options)
                                   throws java.io.IOException

Description copied from class: ArchiveOutputStream

Creates an archive entry using the inputPath and entryName provided.

The default implementation calls simply delegates as:

 return createArchiveEntry(inputFile.toFile(), entryName);
 

Subclasses should override this method.

Overrides:

createArchiveEntry in class ArchiveOutputStream<TarArchiveEntry>

Parameters:

inputPath - the file to create the entry from

entryName - name to use for the entry

options - options indicating how symbolic links are handled.

Returns:

the ArchiveEntry set up with details from the file

Throws:

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

finish

public void finish()
            throws java.io.IOException

Finishes 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<TarArchiveEntry>

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

getBytesWritten

public long getBytesWritten()

Description copied from class: ArchiveOutputStream

Gets the current number of bytes written to this stream.

Overrides:

getBytesWritten in class ArchiveOutputStream<TarArchiveEntry>

Returns:

the number of written bytes

getCount

@Deprecated
public int getCount()

Deprecated.

Description copied from class: ArchiveOutputStream

Gets the current number of bytes written to this stream.

Overrides:

getCount in class ArchiveOutputStream<TarArchiveEntry>

Returns:

the number of written bytes

getRecordSize

@Deprecated
public int getRecordSize()

Deprecated.

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

Returns:

The TarBuffer record size.

putArchiveEntry

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

Puts 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<TarArchiveEntry>

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

java.lang.IllegalArgumentException - if the longFileMode equals LONGFILE_ERROR and the file name is too long

java.lang.IllegalArgumentException - if the bigNumberMode equals BIGNUMBER_ERROR and one of the numeric values exceeds the limits of a traditional tar header.

setAddPaxHeadersForNonAsciiNames

public void setAddPaxHeadersForNonAsciiNames(boolean b)

Sets 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

setBigNumberMode

public void setBigNumberMode(int bigNumberMode)

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

Parameters:

bigNumberMode - the mode to use

Since:

1.4

setLongFileMode

public void setLongFileMode(int longFileMode)

Sets the long file mode. This can be LONGFILE_ERROR(0), LONGFILE_TRUNCATE(1), LONGFILE_GNU(2) or LONGFILE_POSIX(3). This specifies the treatment of long file names (names >= TarConstants.NAMELEN). Default is LONGFILE_ERROR.

Parameters:

longFileMode - the mode to use

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