org.apache.commons.compress.archivers.cpio

Class CpioArchiveOutputStream

java.lang.Object

java.io.OutputStream

org.apache.commons.compress.archivers.ArchiveOutputStream

org.apache.commons.compress.archivers.cpio.CpioArchiveOutputStream

All Implemented Interfaces:

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

public class CpioArchiveOutputStream
extends ArchiveOutputStream
implements CpioConstants

CpioArchiveOutputStream is a stream for writing CPIO streams. All formats of CPIO are supported (old ASCII, old binary, new portable format and the new portable format with CRC).

An entry can be written by creating an instance of CpioArchiveEntry and fill it with the necessary values and put it into the CPIO stream. Afterwards write the contents of the file into the CPIO stream. Either close the stream by calling finish() or put a next entry into the cpio stream.

 CpioArchiveOutputStream out = new CpioArchiveOutputStream(
         new FileOutputStream(new File("test.cpio")));
 CpioArchiveEntry entry = new CpioArchiveEntry();
 entry.setName("testfile");
 String contents = "12345";
 entry.setFileSize(contents.length());
 entry.setMode(CpioConstants.C_ISREG); // regular file
 ... set other attributes, e.g. time, number of links
 out.putArchiveEntry(entry);
 out.write(testContents.getBytes());
 out.close();
 

Note: This implementation should be compatible to cpio 2.5

This class uses mutable fields and is not considered threadsafe.

based on code from the jRPM project (jrpm.sourceforge.net)

Field Summary

Fields inherited from interface org.apache.commons.compress.archivers.cpio.CpioConstants

BLOCK_SIZE, C_IRGRP, C_IROTH, C_IRUSR, C_ISBLK, C_ISCHR, C_ISDIR, C_ISFIFO, C_ISGID, C_ISLNK, C_ISNWK, C_ISREG, C_ISSOCK, C_ISUID, C_ISVTX, C_IWGRP, C_IWOTH, C_IWUSR, C_IXGRP, C_IXOTH, C_IXUSR, CPIO_TRAILER, FORMAT_NEW, FORMAT_NEW_CRC, FORMAT_NEW_MASK, FORMAT_OLD_ASCII, FORMAT_OLD_BINARY, FORMAT_OLD_MASK, MAGIC_NEW, MAGIC_NEW_CRC, MAGIC_OLD_ASCII, MAGIC_OLD_BINARY, S_IFMT

Constructor Summary

Constructors

Constructor and Description
CpioArchiveOutputStream(java.io.OutputStream out) Construct the cpio output stream.
CpioArchiveOutputStream(java.io.OutputStream out, short format) Construct the cpio output stream with a specified format, a blocksize of BLOCK_SIZE and using ASCII as the file name encoding.
CpioArchiveOutputStream(java.io.OutputStream out, short format, int blockSize) Construct the cpio output stream with a specified format using ASCII as the file name encoding.
CpioArchiveOutputStream(java.io.OutputStream out, short format, int blockSize, java.lang.String encoding) Construct the cpio output stream with a specified format using ASCII as the file name encoding.
CpioArchiveOutputStream(java.io.OutputStream out, java.lang.String encoding) Construct the cpio output stream.

Method Summary

Modifier and Type	Method and Description
void	close() Closes the CPIO output stream as well as the stream being filtered.
void	closeArchiveEntry() Closes the archive entry, writing any trailer information that may be required.
ArchiveEntry	createArchiveEntry(java.io.File inputFile, java.lang.String entryName) Creates a new ArchiveEntry.
void	finish() Finishes writing the contents of the CPIO output stream without closing the underlying stream.
void	putArchiveEntry(ArchiveEntry entry) Begins writing a new CPIO file entry and positions the stream to the start of the entry data.
void	write(byte[] b, int off, int len) Writes an array of bytes to the current CPIO entry data.

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

canWriteEntryData, getBytesWritten, getCount, write

Methods inherited from class java.io.OutputStream

flush, write

Methods inherited from class java.lang.Object

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

Constructor Detail

CpioArchiveOutputStream

public CpioArchiveOutputStream(java.io.OutputStream out,
                               short format)

Construct the cpio output stream with a specified format, a blocksize of BLOCK_SIZE and using ASCII as the file name encoding.

Parameters:

out - The cpio stream

format - The format of the stream

CpioArchiveOutputStream

public CpioArchiveOutputStream(java.io.OutputStream out,
                               short format,
                               int blockSize)

Construct the cpio output stream with a specified format using ASCII as the file name encoding.

Parameters:

out - The cpio stream

format - The format of the stream

blockSize - The block size of the archive.

Since:

1.1

CpioArchiveOutputStream

public CpioArchiveOutputStream(java.io.OutputStream out,
                               short format,
                               int blockSize,
                               java.lang.String encoding)

Construct the cpio output stream with a specified format using ASCII as the file name encoding.

Parameters:

out - The cpio stream

format - The format of the stream

blockSize - The block size of the archive.

encoding - The encoding of file names to write - use null for the platform's default.

Since:

1.6

CpioArchiveOutputStream

public CpioArchiveOutputStream(java.io.OutputStream out)

Construct the cpio output stream. The format for this CPIO stream is the "new" format using ASCII encoding for file names

Parameters:

out - The cpio stream

CpioArchiveOutputStream

public CpioArchiveOutputStream(java.io.OutputStream out,
                               java.lang.String encoding)

Construct the cpio output stream. The format for this CPIO stream is the "new" format.

Parameters:

out - The cpio stream

encoding - The encoding of file names to write - use null for the platform's default.

Since:

1.6

Method Detail

putArchiveEntry

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

Begins writing a new CPIO file entry and positions the stream to the start of the entry data. Closes the current entry if still active. The current time will be used if the entry has no set modification time and the default header format will be used if no other format is specified in the entry.

Specified by:

putArchiveEntry in class ArchiveOutputStream

Parameters:

entry - the CPIO cpioEntry to be written

Throws:

java.io.IOException - if an I/O error has occurred or if a CPIO file error has occurred

java.lang.ClassCastException - if entry is not an instance of CpioArchiveEntry

closeArchiveEntry

public void closeArchiveEntry()
                       throws java.io.IOException

Description copied from class: ArchiveOutputStream

Closes the archive entry, writing any trailer information that may be required.

Specified by:

closeArchiveEntry in class ArchiveOutputStream

Throws:

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

write

public void write(byte[] b,
                  int off,
                  int len)
           throws java.io.IOException

Writes an array of bytes to the current CPIO entry data. This method will block until all the bytes are written.

Overrides:

write in class java.io.OutputStream

Parameters:

b - the data to be written

off - the start offset in the data

len - the number of bytes that are written

Throws:

java.io.IOException - if an I/O error has occurred or if a CPIO file error has occurred

finish

public void finish()
            throws java.io.IOException

Finishes writing the contents of the CPIO output stream without closing the underlying stream. Use this method when applying multiple filters in succession to the same output stream.

Specified by:

finish in class ArchiveOutputStream

Throws:

java.io.IOException - if an I/O exception has occurred or if a CPIO file error has occurred

close

public void close()
           throws java.io.IOException

Closes the CPIO output stream as well as the stream being filtered.

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 - if an I/O error has occurred or if a CPIO file error has occurred

createArchiveEntry

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

Creates a new ArchiveEntry. The entryName must be an ASCII encoded string.

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

See Also:

ArchiveOutputStream.createArchiveEntry(java.io.File, java.lang.String)