Package 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:

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

Direct Known Subclasses:

BinaryRC4Encryptor.BinaryRC4CipherOutputStream

@Internal
public abstract class ChunkedCipherOutputStream
extends java.io.FilterOutputStream

Field Summary

Fields

Modifier and Type	Field	Description
protected int	chunkBits
protected int	chunkMask
protected int	chunkSize

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

Constructors

Constructor	Description
ChunkedCipherOutputStream(DirectoryNode dir, int chunkSize)

Method Summary

Modifier and Type	Method	Description
protected abstract void	calculateChecksum(java.io.File fileOut, int oleStreamSize)
void	close()
protected abstract void	createEncryptionInfoEntry(DirectoryNode dir, java.io.File tmpFile)
protected abstract javax.crypto.Cipher	initCipherForBlock(javax.crypto.Cipher existing, int block, boolean lastChunk)
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)
protected void	writeChunk()

Methods inherited from class java.io.FilterOutputStream

flush

Methods inherited from class java.lang.Object

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

Field Detail

chunkSize

protected final int chunkSize

chunkMask

protected final int chunkMask

chunkBits

protected final int chunkBits

Constructor Detail

ChunkedCipherOutputStream

public ChunkedCipherOutputStream(DirectoryNode dir,
                                 int chunkSize)
                          throws java.io.IOException,
                                 java.security.GeneralSecurityException

Throws:

java.io.IOException

java.security.GeneralSecurityException

Method Detail

initCipherForBlock

protected abstract javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher existing,
                                                          int block,
                                                          boolean lastChunk)
                                                   throws java.security.GeneralSecurityException

Throws:

java.security.GeneralSecurityException

calculateChecksum

protected abstract void calculateChecksum(java.io.File fileOut,
                                          int oleStreamSize)
                                   throws java.security.GeneralSecurityException,
                                          java.io.IOException

Throws:

java.security.GeneralSecurityException

java.io.IOException

createEncryptionInfoEntry

protected abstract void createEncryptionInfoEntry(DirectoryNode dir,
                                                  java.io.File tmpFile)
                                           throws java.io.IOException,
                                                  java.security.GeneralSecurityException

Throws:

java.io.IOException

java.security.GeneralSecurityException

write

public void write(int b)
           throws java.io.IOException

Overrides:

write in class java.io.FilterOutputStream

Throws:

java.io.IOException

write

public void write(byte[] b)
           throws java.io.IOException

Overrides:

write in class java.io.FilterOutputStream

Throws:

java.io.IOException

write

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

Overrides:

write in class java.io.FilterOutputStream

Throws:

java.io.IOException

writeChunk

protected void writeChunk()
                   throws java.io.IOException,
                          java.security.GeneralSecurityException

Throws:

java.io.IOException

java.security.GeneralSecurityException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.FilterOutputStream

Throws:

java.io.IOException