org.apache.poi.poifs.crypt

Class ChunkedCipherOutputStream

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

org.apache.poi.poifs.crypt.ChunkedCipherOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

@Internal
public abstract class ChunkedCipherOutputStream
extends FilterOutputStream

Constructor Summary

Constructors

Constructor and Description
ChunkedCipherOutputStream(DirectoryNode dir, int chunkSize)
ChunkedCipherOutputStream(OutputStream stream, int chunkSize)

Method Summary

Modifier and Type	Method and Description
void	close()
Cipher	initCipherForBlock(int block, boolean lastChunk)
void	setNextRecordSize(int recordSize, boolean isPlain) Some ciphers (actually just XOR) are based on the record size, which needs to be set before encryption
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)
void	writePlain(byte[] b, int off, int len)

Methods inherited from class java.io.FilterOutputStream

flush

Methods inherited from class java.lang.Object

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

Constructor Detail

ChunkedCipherOutputStream

public ChunkedCipherOutputStream(DirectoryNode dir,
                                 int chunkSize)
                          throws IOException,
                                 GeneralSecurityException

Throws:

IOException

GeneralSecurityException

ChunkedCipherOutputStream

public ChunkedCipherOutputStream(OutputStream stream,
                                 int chunkSize)
                          throws IOException,
                                 GeneralSecurityException

Throws:

IOException

GeneralSecurityException

Method Detail

initCipherForBlock

public final Cipher initCipherForBlock(int block,
                                       boolean lastChunk)
                                throws IOException,
                                       GeneralSecurityException

Throws:

IOException

GeneralSecurityException

write

public void write(int b)
           throws IOException

Overrides:

write in class FilterOutputStream

Throws:

IOException

write

public void write(byte[] b)
           throws IOException

Overrides:

write in class FilterOutputStream

Throws:

IOException

write

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

Overrides:

write in class FilterOutputStream

Throws:

IOException

writePlain

public void writePlain(byte[] b,
                       int off,
                       int len)
                throws IOException

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class FilterOutputStream

Throws:

IOException

setNextRecordSize

public void setNextRecordSize(int recordSize,
                              boolean isPlain)

Some ciphers (actually just XOR) are based on the record size, which needs to be set before encryption

Parameters:

recordSize - the size of the next record

isPlain - true if the record is unencrypted