IT. Expert System.

Direct Known Subclasses:

DerInputStream

public class BerInputStream
extends Object

See Also:

ASN.1

• Field Summary

  Fields

  Modifier and Type	Field and Description
  protected byte[]	buffer
  int	choiceIndex The last choice index
  Object	content Current decoded content
  protected int	contentOffset Current decoded content offset
  protected static int	INDEFINIT_LENGTH Indicates indefinite length of the current type
  protected boolean	isIndefinedLength Indicates defined or indefined reading mode for associated InputStream.
  protected boolean	isVerify Indicates verify or store mode.
  protected int	length Current decoded length
  protected int	offset The position in the buffer.
  int	oidElement
  int	tag Current decoded tag
  protected int	tagOffset Current decoded tag offset
  int[]	times Keeps last decoded: year, month, day, hour, minute, second, millisecond

• Constructor Summary

  Constructors

  Constructor and Description
  BerInputStream(byte[] encoded) Creates stream for decoding.
  BerInputStream(byte[] encoded, int offset, int expectedLength) Creates stream for decoding.
  BerInputStream(InputStream in) Creates stream for decoding.
  BerInputStream(InputStream in, int initialSize) Creates stream for decoding.

• Method Summary

  Methods

  Modifier and Type	Method and Description
  void	compactBuffer() Reallocates the buffer in order to make it exactly the size of data it contains
  Object	get(Object key)
  byte[]	getBuffer() Returns internal buffer used for decoding
  byte[]	getEncoded() Returns encoded array.
  int	getEndOffset() Returns end offset for the current encoded type
  int	getLength() Returns length of the current content for decoding
  static int	getLength(byte[] encoding) Returns the length of the encoding
  int	getOffset() Returns the current offset
  int	getTagOffset() Returns start offset for the current encoded type
  int	next() Decodes next encoded type.
  void	put(Object key, Object entry)
  protected int	read() Reads the next encoded byte from the encoded input stream.
  void	readBitString() Decodes ASN.1 bitstring type
  void	readBoolean() Decodes ASN.1 boolean type
  void	readContent() Reads the next encoded content from the encoded input stream.
  void	readEnumerated() Decodes ASN.1 Enumerated type
  void	readGeneralizedTime() Decodes ASN.1 GeneralizedTime type
  void	readInteger() Decodes ASN.1 Integer type
  void	readOctetString() Decodes ASN.1 Octetstring type
  void	readOID() Decodes ASN.1 ObjectIdentifier type
  void	readSequence(ASN1Sequence sequence) Decodes ASN.1 Sequence type
  void	readSequenceOf(ASN1SequenceOf sequenceOf) Decodes ASN.1 SequenceOf type
  void	readSet(ASN1Set set) Decodes ASN.1 Set type
  void	readSetOf(ASN1SetOf setOf) Decodes ASN.1 SetOf type
  void	readString(ASN1StringType type) Decodes ASN.1 String type
  void	readUTCTime() Decodes ASN.1 UTCTime type
  void	reset(byte[] encoded) Resets this stream to initial state.
  void	setVerify() Sets verify mode.

  • Methods inherited from class java.lang.Object

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

• Field Detail

  • buffer

    protected byte[] buffer

  • offset

    protected int offset

    The position in the buffer. Next read must place data into the buffer from this offset

  • INDEFINIT_LENGTH

    protected static final int INDEFINIT_LENGTH

    Indicates indefinite length of the current type

    See Also:

    Constant Field Values

  • tag

    public int tag

    Current decoded tag

  • length

    protected int length

    Current decoded length

  • content

    public Object content

    Current decoded content

  • tagOffset

    protected int tagOffset

    Current decoded tag offset

  • contentOffset

    protected int contentOffset

    Current decoded content offset

  • choiceIndex

    public int choiceIndex

    The last choice index

  • times

    public int[] times

    Keeps last decoded: year, month, day, hour, minute, second, millisecond

  • oidElement

    public int oidElement

  • isVerify

    protected boolean isVerify

    Indicates verify or store mode. In store mode a decoded content is stored in a newly allocated appropriate object. The content variable holds a reference to the last created object. In verify mode a decoded content is not stored.

  • isIndefinedLength

    protected boolean isIndefinedLength

    Indicates defined or indefined reading mode for associated InputStream. This mode is defined by reading a length for a first ASN.1 type from InputStream.

• Constructor Detail

  • BerInputStream

    public BerInputStream(byte[] encoded)
                   throws IOException

    Creates stream for decoding.

    Throws:

    IOException

  • BerInputStream

    public BerInputStream(byte[] encoded,
                  int offset,
                  int expectedLength)
                   throws IOException

    Creates stream for decoding.

    Parameters:

    encoded - bytes array to be decoded

    offset - the encoding offset

    expectedLength - expected length of full encoding, this includes identifier, length an content octets

    Throws:

    IOException

  • BerInputStream

    public BerInputStream(InputStream in)
                   throws IOException

    Creates stream for decoding. Allocates initial buffer of default size

    Throws:

    IOException

  • BerInputStream

    public BerInputStream(InputStream in,
                  int initialSize)
                   throws IOException

    Creates stream for decoding.

    Parameters:

    initialSize - the internal buffer initial size

    Throws:

    IOException

• Method Detail

  • reset

    public final void reset(byte[] encoded)
                     throws IOException

    Resets this stream to initial state.

    Parameters:

    encoded - a new bytes array to be decoded

    Throws:

    IOException - if an error occurs

  • next

    public int next()
             throws IOException

    Decodes next encoded type. Initializes tag, length, tagOffset and contentOffset variables

    Returns:

    next decoded tag

    Throws:

    IOException - if error occured

  • getLength

    public static int getLength(byte[] encoding)

    Returns the length of the encoding

  • readBitString

    public void readBitString()
                       throws IOException

    Decodes ASN.1 bitstring type

    Throws:

    IOException

  • readEnumerated

    public void readEnumerated()
                        throws IOException

    Decodes ASN.1 Enumerated type

    Throws:

    IOException

  • readBoolean

    public void readBoolean()
                     throws IOException

    Decodes ASN.1 boolean type

    Throws:

    IOException

  • readGeneralizedTime

    public void readGeneralizedTime()
                             throws IOException

    Decodes ASN.1 GeneralizedTime type

    Throws:

    IOException - if error occured

  • readUTCTime

    public void readUTCTime()
                     throws IOException

    Decodes ASN.1 UTCTime type

    Throws:

    IOException - if an I/O error occurs or the end of the stream is reached

  • readInteger

    public void readInteger()
                     throws IOException

    Decodes ASN.1 Integer type

    Throws:

    IOException

  • readOctetString

    public void readOctetString()
                         throws IOException

    Decodes ASN.1 Octetstring type

    Throws:

    IOException

  • readOID

    public void readOID()
                 throws IOException

    Decodes ASN.1 ObjectIdentifier type

    Throws:

    IOException

  • readSequence

    public void readSequence(ASN1Sequence sequence)
                      throws IOException

    Decodes ASN.1 Sequence type

    Throws:

    IOException

  • readSequenceOf

    public void readSequenceOf(ASN1SequenceOf sequenceOf)
                        throws IOException

    Decodes ASN.1 SequenceOf type

    Throws:

    IOException

  • readSet

    public void readSet(ASN1Set set)
                 throws IOException

    Decodes ASN.1 Set type

    Throws:

    IOException

  • readSetOf

    public void readSetOf(ASN1SetOf setOf)
                   throws IOException

    Decodes ASN.1 SetOf type

    Throws:

    IOException

  • readString

    public void readString(ASN1StringType type)
                    throws IOException

    Decodes ASN.1 String type

    Throws:

    IOException - if an I/O error occurs or the end of the stream is reached

  • getEncoded

    public byte[] getEncoded()

    Returns encoded array. MUST be invoked after decoding corresponding ASN.1 notation

  • getBuffer

    public final byte[] getBuffer()

    Returns internal buffer used for decoding

  • getLength

    public final int getLength()

    Returns length of the current content for decoding

  • getOffset

    public final int getOffset()

    Returns the current offset

  • getEndOffset

    public final int getEndOffset()

    Returns end offset for the current encoded type

  • getTagOffset

    public final int getTagOffset()

    Returns start offset for the current encoded type

  • setVerify

    public final void setVerify()

    Sets verify mode.

  • read

    protected int read()
                throws IOException

    Reads the next encoded byte from the encoded input stream.

    Throws:

    IOException

  • readContent

    public void readContent()
                     throws IOException

    Reads the next encoded content from the encoded input stream. The method MUST be used for reading a primitive encoded content.

    Throws:

    IOException

  • compactBuffer

    public void compactBuffer()

    Reallocates the buffer in order to make it exactly the size of data it contains

  • put

    public void put(Object key,
           Object entry)

  • get

    public Object get(Object key)