org.alfresco.jlan.server.auth.asn

Class DERBuffer

java.lang.Object

org.alfresco.jlan.server.auth.asn.DERBuffer

public class DERBuffer
extends java.lang.Object

DER Buffer Class

Pack/unpack objects from a ASN.1 DER encoded blob.

Constructor Summary

Constructors

Constructor and Description
DERBuffer() Default constructor
DERBuffer(byte[] buf) Create a data buffer to read data from
DERBuffer(byte[] buf, int off, int len) Create a data buffer to read data from
DERBuffer(int siz) Create a data buffer to write data to

Method Summary

Methods

Modifier and Type	Method and Description
int	calculateLengthBytes(int len) Calculate the number of length bytes required for a data length
int	getAvailableLength() Return the available data length
byte[]	getBuffer() Return the data buffer
byte[]	getBytes() Return the used buffer as a byte array
int	getLength() Return the data length
int	getLengthInWords() Return the data length in words
int	getPosition() Return the data position
void	packApplicationSpecific(byte[] byts) Pack an application specific object
void	packApplicationSpecific(DERObject derObj) Pack an application specific object
void	packApplicationSpecific(int tagId, byte[] byts) Pack an application specific object
void	packApplicationSpecific(int tagId, DERObject derObj) Pack an application specific object
void	packApplicationSpecific(int tagId, java.util.List derList) Pack an application specific list of objects
void	packApplicationSpecific(java.util.List derList) Pack an application specific list of objects
void	packByte(int bval) Append a byte value to the buffer
void	packByteAt(int pos, int bval) Pack a byte at the specified position
void	packBytes(byte[] buf, int off, int len) Pack bytes into the buffer
void	packBytes(DERBuffer buf) Pack bytes from the specified DER buffer into this buffer
void	packInt(int ival) Pack an integer value
void	packLength(int len) Pack a data length
void	packLong(long lval) Pack a long value
void	packObject(DERObject derObj) Pack an object
int	peekType() Peek at the next type in the buffer
void	setEndOfBuffer() Set the end of buffer position, and reset the read position to the beginning of the buffer
void	setLength(int len) Set the data length
void	setPosition(int pos) Set the read/write buffer position
DERObject	unpackApplicationSpecific() Unpack an application specific object
byte[]	unpackApplicationSpecificBytes() Unpack an application specific blob
int	unpackByte() Unpack a data byte from the buffer
byte[]	unpackBytes(int len) Unpack a block of bytes
int	unpackInt(int len) Unpack an integer value
int	unpackLength() Unpack a data length value
long	unpackLong(int len) Unpack a long (64 bit) value
DERObject	unpackObject() Unpack an object from the buffer
int	unpackType() Unpack a data type from the buffer

Methods inherited from class java.lang.Object

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

Constructor Detail

DERBuffer

public DERBuffer()

Default constructor

DERBuffer

public DERBuffer(int siz)

Create a data buffer to write data to

Parameters:

siz - int

DERBuffer

public DERBuffer(byte[] buf,
         int off,
         int len)

Create a data buffer to read data from

Parameters:

buf - byte[]

off - int

len - int

DERBuffer

public DERBuffer(byte[] buf)

Create a data buffer to read data from

Parameters:

buf - byte[]

Method Detail

getBuffer

public final byte[] getBuffer()

Return the data buffer

Returns:

byte[]

getLength

public final int getLength()

Return the data length

Returns:

int

getLengthInWords

public final int getLengthInWords()

Return the data length in words

Returns:

int

getAvailableLength

public final int getAvailableLength()

Return the available data length

Returns:

int

getPosition

public final int getPosition()

Return the data position

Returns:

int

getBytes

public final byte[] getBytes()

Return the used buffer as a byte array

Returns:

byte[]

unpackByte

public final int unpackByte()

Unpack a data byte from the buffer

Returns:

int

unpackBytes

public final byte[] unpackBytes(int len)

Unpack a block of bytes

Parameters:

len - int

Returns:

byte[]

peekType

public final int peekType()

Peek at the next type in the buffer

Returns:

int

unpackType

public final int unpackType()

Unpack a data type from the buffer

Returns:

int

unpackLength

public final int unpackLength()

Unpack a data length value

Returns:

int

unpackObject

public final DERObject unpackObject()
                             throws java.io.IOException

Unpack an object from the buffer

Returns:

DERObject

Throws:

java.io.IOException

unpackInt

public final int unpackInt(int len)

Unpack an integer value

Parameters:

len - int

Returns:

int

unpackLong

public final long unpackLong(int len)

Unpack a long (64 bit) value

Parameters:

len - int

Returns:

long

packByte

public final void packByte(int bval)

Append a byte value to the buffer

Parameters:

bval - int

packByteAt

public final void packByteAt(int pos,
              int bval)

Pack a byte at the specified position

Parameters:

pos - int

bval - int

packBytes

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

Pack bytes into the buffer

Parameters:

buf - byte[]

off - int

len - int

packBytes

public final void packBytes(DERBuffer buf)

Pack bytes from the specified DER buffer into this buffer

Parameters:

buf - DERBuffer

packLength

public final void packLength(int len)

Pack a data length

Parameters:

len - int

packInt

public final void packInt(int ival)

Pack an integer value

Parameters:

ival - int

packLong

public final void packLong(long lval)

Pack a long value

Parameters:

lval - long

packObject

public final void packObject(DERObject derObj)
                      throws java.io.IOException

Pack an object

Parameters:

derObj - DERObject

Throws:

java.io.IOException

packApplicationSpecific

public final void packApplicationSpecific(DERObject derObj)
                                   throws java.io.IOException

Pack an application specific object

Parameters:

derObj - DERObject

Throws:

java.io.IOException

packApplicationSpecific

public final void packApplicationSpecific(int tagId,
                           DERObject derObj)
                                   throws java.io.IOException

Pack an application specific object

Parameters:

tagId - int

derObj - DERObject

Throws:

java.io.IOException

packApplicationSpecific

public final void packApplicationSpecific(java.util.List derList)
                                   throws java.io.IOException

Pack an application specific list of objects

Parameters:

derList - List

Throws:

java.io.IOException

packApplicationSpecific

public final void packApplicationSpecific(int tagId,
                           java.util.List derList)
                                   throws java.io.IOException

Pack an application specific list of objects

Parameters:

tagId - int

derList - List

Throws:

java.io.IOException

packApplicationSpecific

public final void packApplicationSpecific(int tagId,
                           byte[] byts)
                                   throws java.io.IOException

Pack an application specific object

Parameters:

tagId - int

byts - byte[]

Throws:

java.io.IOException

packApplicationSpecific

public final void packApplicationSpecific(byte[] byts)
                                   throws java.io.IOException

Pack an application specific object

Parameters:

byts - byte[]

Throws:

java.io.IOException

unpackApplicationSpecific

public final DERObject unpackApplicationSpecific()
                                          throws java.io.IOException

Unpack an application specific object

Returns:

DERObject

Throws:

java.io.IOException

unpackApplicationSpecificBytes

public final byte[] unpackApplicationSpecificBytes()
                                            throws java.io.IOException

Unpack an application specific blob

Returns:

byte[]

Throws:

java.io.IOException

calculateLengthBytes

public final int calculateLengthBytes(int len)

Calculate the number of length bytes required for a data length

Parameters:

len -

Returns:

int

setPosition

public final void setPosition(int pos)

Set the read/write buffer position

Parameters:

pos - int

setEndOfBuffer

public final void setEndOfBuffer()

Set the end of buffer position, and reset the read position to the beginning of the buffer

setLength

public final void setLength(int len)

Set the data length

Parameters:

len - int