org.apache.poi.hssf.record.crypto

Class Biff8DecryptingStream

java.lang.Object

org.apache.poi.hssf.record.crypto.Biff8DecryptingStream

All Implemented Interfaces:

BiffHeaderInput, LittleEndianInput

public final class Biff8DecryptingStream
extends java.lang.Object
implements BiffHeaderInput, LittleEndianInput

Field Summary

Fields

Modifier and Type	Field and Description
static int	RC4_REKEYING_INTERVAL

Constructor Summary

Constructors

Constructor and Description
Biff8DecryptingStream(java.io.InputStream in, int initialOffset, EncryptionInfo info)

Method Summary

Modifier and Type	Method and Description
int	available()
long	getPosition()
static boolean	isNeverEncryptedRecord(int sid) TODO: Additionally, the lbPlyPos (position_of_BOF) field of the BoundSheet8 record MUST NOT be encrypted.
byte	readByte()
int	readDataSize() Reads an unsigned short value without decrypting
double	readDouble()
void	readFully(byte[] buf)
void	readFully(byte[] buf, int off, int len)
int	readInt()
long	readLong()
void	readPlain(byte[] b, int off, int len) Usually acts the same as LittleEndianInput.readFully(byte[], int, int), but for an encrypted stream the raw (unencrypted) data is filled
int	readRecordSID() Reads an unsigned short value without decrypting
short	readShort()
int	readUByte()
int	readUShort()

Methods inherited from class java.lang.Object

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

Field Detail

RC4_REKEYING_INTERVAL

public static final int RC4_REKEYING_INTERVAL

See Also:

Constant Field Values

Constructor Detail

Biff8DecryptingStream

public Biff8DecryptingStream(java.io.InputStream in,
                             int initialOffset,
                             EncryptionInfo info)
                      throws RecordFormatException

Throws:

RecordFormatException

Method Detail

available

public int available()

Specified by:

available in interface BiffHeaderInput

Specified by:

available in interface LittleEndianInput

Returns:

the available bytes

readRecordSID

public int readRecordSID()

Reads an unsigned short value without decrypting

Specified by:

readRecordSID in interface BiffHeaderInput

Returns:

the record sid

readDataSize

public int readDataSize()

Reads an unsigned short value without decrypting

Specified by:

readDataSize in interface BiffHeaderInput

Returns:

the data size

readDouble

public double readDouble()

Specified by:

readDouble in interface LittleEndianInput

readFully

public void readFully(byte[] buf)

Specified by:

readFully in interface LittleEndianInput

readFully

public void readFully(byte[] buf,
                      int off,
                      int len)

Specified by:

readFully in interface LittleEndianInput

readUByte

public int readUByte()

Specified by:

readUByte in interface LittleEndianInput

readByte

public byte readByte()

Specified by:

readByte in interface LittleEndianInput

readUShort

public int readUShort()

Specified by:

readUShort in interface LittleEndianInput

readShort

public short readShort()

Specified by:

readShort in interface LittleEndianInput

readInt

public int readInt()

Specified by:

readInt in interface LittleEndianInput

readLong

public long readLong()

Specified by:

readLong in interface LittleEndianInput

getPosition

public long getPosition()

Returns:

the absolute position in the stream

isNeverEncryptedRecord

public static boolean isNeverEncryptedRecord(int sid)

TODO: Additionally, the lbPlyPos (position_of_BOF) field of the BoundSheet8 record MUST NOT be encrypted.

Returns:

true if record type specified by sid is never encrypted

readPlain

public void readPlain(byte[] b,
                      int off,
                      int len)

Description copied from interface: LittleEndianInput

Usually acts the same as LittleEndianInput.readFully(byte[], int, int), but for an encrypted stream the raw (unencrypted) data is filled

Specified by:

readPlain in interface LittleEndianInput

Parameters:

b - the byte array to receive the bytes

off - the start offset into the byte array

len - the amount of bytes to fill