Package org.docx4j.org.apache.poi.poifs.crypt

Class ChunkedCipherInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

org.docx4j.org.apache.poi.util.LittleEndianInputStream

org.docx4j.org.apache.poi.poifs.crypt.ChunkedCipherInputStream

All Implemented Interfaces:

Closeable, AutoCloseable, LittleEndianInput

Direct Known Subclasses:

AgileDecryptor.AgileCipherInputStream, BinaryRC4Decryptor.BinaryRC4CipherInputStream

@Internal
public abstract class ChunkedCipherInputStream
extends LittleEndianInputStream

Field Summary

Fields

Modifier and Type	Field	Description
private byte[]	_chunk
private Cipher	_cipher
private int	_lastIndex
private long	_pos
private long	_size
private final int	chunkBits
private final int	chunkMask
private final int	chunkSize

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor	Description
ChunkedCipherInputStream(LittleEndianInput stream, long size, int chunkSize)

Method Summary

Modifier and Type	Method	Description
int	available()
protected abstract Cipher	initCipherForBlock(Cipher existing, int block)
void	mark(int readlimit)
boolean	markSupported()
private byte[]	nextChunk()
int	read()
int	read(byte[] b, int off, int len)
void	reset()
long	skip(long n)

Methods inherited from class org.docx4j.org.apache.poi.util.LittleEndianInputStream

readByte, readDouble, readFully, readFully, readInt, readLong, readShort, readUByte, readUInt, readUShort

Methods inherited from class java.io.FilterInputStream

close, read

Methods inherited from class java.io.InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo

Methods inherited from class java.lang.Object

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

Field Details

chunkSize

private final int chunkSize

chunkMask

private final int chunkMask

chunkBits

private final int chunkBits

_lastIndex

private int _lastIndex

_pos

private long _pos

_size

private long _size

_chunk

private byte[] _chunk

_cipher

private Cipher _cipher

Constructor Details

ChunkedCipherInputStream

public ChunkedCipherInputStream(LittleEndianInput stream,
 long size,
 int chunkSize)
                         throws GeneralSecurityException

Throws:

GeneralSecurityException

Method Details

initCipherForBlock

protected abstract Cipher initCipherForBlock(Cipher existing,
 int block)
                                      throws GeneralSecurityException

Throws:

GeneralSecurityException

read

public int read()
         throws IOException

Overrides:

read in class FilterInputStream

Throws:

IOException

read

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

Overrides:

read in class FilterInputStream

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class FilterInputStream

Throws:

IOException

available

public int available()

Specified by:

available in interface LittleEndianInput

Overrides:

available in class LittleEndianInputStream

markSupported

public boolean markSupported()

Overrides:

markSupported in class FilterInputStream

mark

public void mark(int readlimit)

Overrides:

mark in class FilterInputStream

reset

public void reset()
           throws IOException

Overrides:

reset in class FilterInputStream

Throws:

IOException

nextChunk

private byte[] nextChunk()
                  throws GeneralSecurityException,
IOException

Throws:

GeneralSecurityException

IOException