Inheritance diagram for Asn1BerDecodeBuffer:

Public Member Functions
	Asn1BerDecodeBuffer (byte[] msgdata)

	Asn1BerDecodeBuffer (System.IO.Stream istream)

int	DecodeEnumValue (bool explicitTagging, int implicitLength)

int	DecodeEnumValue (Asn1Tag tag, bool explicitTagging, int implicitLength)

virtual int	DecodeLength ()

virtual byte []	DecodeOpenType ()

virtual byte []	DecodeOpenType (bool saveData)

virtual void	DecodeTag (Asn1Tag tag)

virtual int	DecodeTagAndLength (Asn1Tag tag)

virtual bool	MatchTag (short tagClass, short tagForm, int tagIDCode, Asn1Tag parsedTag, IntHolder parsedLen)

virtual bool	MatchTag (Asn1Tag tag, Asn1Tag parsedTag, IntHolder parsedLen)

virtual bool	MatchTag (Asn1Tag tag)

virtual void	Parse (Asn1TaggedEventHandler handler)

virtual void	PeekTag (Asn1Tag parsedTag)

virtual Asn1Tag	PeekTag ()

override int	ReadByte ()

Public Member Functions inherited from Asn1DecodeBuffer
virtual void	AddCaptureBuffer (System.IO.MemoryStream buffer)

virtual void	Capture (int nbytes)

virtual long	DecodeIntValue (int length, bool signExtend)

virtual int []	DecodeOIDContents (int llen)

virtual int []	DecodeRelOIDContents (int llen)

override System.IO.Stream	GetInputStream ()

virtual void	HexDump ()

virtual void	Mark ()

virtual int	Read ()

virtual void	Read (byte[] buffer, int offset, int nbytes)

virtual void	Read (byte[] buffer)

int	Read2Bytes ()

int	Read4Bytes ()

virtual void	RemoveCaptureBuffer (System.IO.MemoryStream buffer)

virtual void	Reset ()

virtual void	SetInputStream (byte[] msgdata, int offset, int length)

virtual long	Skip (long nbytes)

Public Member Functions inherited from Asn1MessageBuffer
virtual void	AddNamedEventHandler (Asn1NamedEventHandler handler)

virtual void	InvokeCharacters (System.String svalue)

virtual void	InvokeEndElement (System.String name, int index)

virtual void	InvokeStartElement (System.String name, int index)

Public Member Functions inherited from Asn1MessageBufferBase
void	SetKey (byte[] rtkey)

void	SetPermanentKey (byte[] rtkey)

Static Public Member Functions
static int	CalcIndefLen (byte[] data, int offset, int len)

Static Public Member Functions inherited from Asn1MessageBufferBase
static void	HexDump (System.IO.Stream ins, System.IO.StreamWriter outs)

static void	HexDump (System.IO.Stream ins)

Properties
virtual Asn1Tag	LastTag `[get]`

Properties inherited from Asn1DecodeBuffer
virtual int	ByteCount `[get]`

bool	LazyOpenTypeDecode `[get, set]`

Properties inherited from Asn1MessageBuffer
virtual Asn1MessageBuffer	EventHandlerList `[set]`

Properties inherited from Asn1MessageBufferBase
Asn1Context	Context `[get]`

virtual short	TypeCode `[set]`

Detailed Description

This class handles the decoding of ASN.1 messages as specified in the Basic Encoding Rules (BER) as documented in the ITU-T X.690 standard.

Constructor & Destructor Documentation

◆ Asn1BerDecodeBuffer() [1/2]

Asn1BerDecodeBuffer ( byte [] msgdata )

This constructor creates a BER Decode buffer object that references an encoded ASN.1 message.

Parameters

msgdata Byte array containing an encoded ASN.1 message.

◆ Asn1BerDecodeBuffer() [2/2]

Asn1BerDecodeBuffer ( System.IO.Stream istream )

This constructor creates a BER Decode buffer object that references an encoded ASN.1 message. In this case, the message is passed in using an System.IO.Stream object.

Parameters

istream Input stream containing an encoded ASN.1 message.

Member Function Documentation

◆ CalcIndefLen()

static int CalcIndefLen	(	byte []	data,
		int	offset,
		int	len
	)

static

This function calculates the actual length of an indefinite length message component.

Parameters

data	Buffer with the indefinite length message component.
offset	The start offset in the array
len	Length of the buffer (begining from the offset)

Returns: calculated length

References Asn1DecodeBuffer.ByteCount, Asn1BerDecodeBuffer.DecodeTagAndLength(), Asn1Status.INDEFLEN, Asn1Tag.IsEOC(), and Asn1DecodeBuffer.Skip().

◆ DecodeEnumValue() [1/2]

int DecodeEnumValue	(	bool	explicitTagging,
		int	implicitLength
	)

This method decodes an enumerated value from the buffer.

Parameters

explicitTagging A flag that indicates the element is explicitly tagged.

Parameters

implicitLength The length of the contents if implicitly tagged.

Returns: The decoded integer value.

References Asn1Type.ENUMERATED, IntHolder.mValue, Asn1Tag.PRIM, and Asn1Tag.UNIV.

◆ DecodeEnumValue() [2/2]

int DecodeEnumValue	(	Asn1Tag	tag,
		bool	explicitTagging,
		int	implicitLength
	)

This method decodes an enumerated value from the buffer.

Parameters

tag	An Asn1Tag value for enumerated values that are tagged other than UNIVERSAL 10.

Parameters

explicitTagging A flag that indicates the element is explicitly tagged.

Parameters

implicitLength The length of the contents if implicitly tagged.

Returns: The decoded integer value.

References Asn1Tag.CONS, Asn1Type.ENUMERATED, Asn1Tag.mForm, and IntHolder.mValue.

◆ DecodeLength()

virtual int DecodeLength ( )

virtual

This method decodes a length value.

Returns: Decoded length value

References Asn1Status.INDEFLEN, Asn1Tag.L7BitsMask, and Diag.Prtln().

◆ DecodeOpenType() [1/2]

virtual byte [] DecodeOpenType ( )

virtual

This method decodes an ASN.1 BER open type value. This is a fully encoded message component of any type. The component is captured in the Decode capture buffer and a reference to a byte array is returned containing the component.

Returns: Reference to byte array containing component.

Referenced by Asn1OpenType.GetDataEncoding().

◆ DecodeOpenType() [2/2]

virtual byte [] DecodeOpenType ( bool saveData )

virtual

This method decodes an ASN.1 BER open type value. This is a fully encoded message component of any type. This version of the method allows the option of saving or discarding the open type data.

Parameters

saveData True if data should be captured and returned

Returns: Reference to byte array containing component.

References Asn1Status.INDEFLEN, Asn1Tag.IsEOC(), and IntHolder.mValue.

◆ DecodeTag()

virtual void DecodeTag ( Asn1Tag tag )

virtual

This method decodes a tag value.

Parameters

tag	Tag object to receive decoded tag fields.

Returns: status value (see Asn1Status.java)

References Asn1Tag.Bit8Mask, Asn1Tag.ClassMask, Asn1Tag.EXTIDCODE, Asn1Tag.FormMask, Asn1Tag.IDMask, Asn1Tag.L7BitsMask, Asn1Tag.mClass, Asn1Tag.mForm, Asn1Tag.mIDCode, Diag.Prtln(), and Asn1Tag.ToString().

◆ DecodeTagAndLength()

virtual int DecodeTagAndLength ( Asn1Tag tag )

virtual

This method decodes a tag and length value.

Parameters

tag	Tag object to receive decoded tag fields.

Returns: Decoded length value.

Referenced by Asn1BerDecodeBuffer.CalcIndefLen().

◆ MatchTag() [1/3]

virtual bool MatchTag	(	short	tagClass,
		short	tagForm,
		int	tagIDCode,
		Asn1Tag	parsedTag,
		IntHolder	parsedLen
	)

virtual

This method decodes the next tag value and checks for a match with the given tag value. If the match is successful, the Decode cursor will be psoitioned at the contents field; otherwise, it will be reset to point to the start of the tag field.

Parameters

tagClass	Class value of tag to match
tagForm	Form value of tag to match
tagIDCode	ID code of tag to match
parsedTag	Holder object to receive parsed tag value
parsedLen	Holder object to receive parsed length value

Returns: True if given tag matches tag at Decode cursor

References Asn1Tag.Equals(), and IntHolder.mValue.

Referenced by Asn1Type._SetKey(), Asn1BerDecodeContext.Expired(), and Asn1BerDecodeContext.MatchElemTag().

◆ MatchTag() [2/3]

virtual bool MatchTag	(	Asn1Tag	tag,
		Asn1Tag	parsedTag,
		IntHolder	parsedLen
	)

virtual

This overloaded version of MatchTag allows the tag value to be matched to be passed using an Asn1Tag object.

Parameters

tag	Tag value to be matched.
parsedTag	Holder object to receive parsed tag value
parsedLen	Holder object to receive parsed length value

Returns: True if given tag matches tag at Decode cursor

References Asn1Tag.mClass, Asn1Tag.mForm, and Asn1Tag.mIDCode.

◆ MatchTag() [3/3]

virtual bool MatchTag ( Asn1Tag tag )

virtual

This overloaded version of MatchTag will just test for a match and not return parsed tag and length values

Parameters

tag	Tag value to be matched.

Returns: True if given tag matches tag at Decode cursor

References Asn1Tag.mClass, Asn1Tag.mForm, and Asn1Tag.mIDCode.

◆ Parse()

virtual void Parse ( Asn1TaggedEventHandler handler )

virtual

This method parses the complete message and invokes the event handler callback methods as various items are encountered.

Parameters

handler Object implementing the Asn1EventHandler interface.

Returns: Status value

References Asn1Tag.Constructed, Asn1TaggedEventHandler.Contents(), Asn1TaggedEventHandler.EndElement(), Asn1Status.INDEFLEN, Asn1Tag.IsEOC(), IntHolder.mValue, and Asn1TaggedEventHandler.StartElement().

Referenced by Asn1BerEncodeBuffer.EncodeTagAndLength().

◆ PeekTag() [1/2]

virtual void PeekTag ( Asn1Tag parsedTag )

virtual

This method will Parse and return the next tag in the Decode stream without advancing the Decode cursor.

Parameters

parsedTag Holder object to receive parsed tag value

◆ PeekTag() [2/2]

virtual Asn1Tag PeekTag ( )

virtual

This overloaded version of the PeekTag method will return a reference to a newly created tag object.

Returns: Parsed tag object value reference

◆ ReadByte()

override int ReadByte ( )

virtual

This method returns the next available 8-bit value from the input stream. It is implemented differently for BER/DER and PER to take into account odd alignments in PER.

Returns: Next 8-bit byte value from input stream

Implements Asn1DecodeBuffer.

Property Documentation

◆ LastTag

virtual Asn1Tag LastTag

get

Gets the last tag parsed within this decode buffer object.

Value: Last parsed tag object reference

Referenced by Asn1BitString.Clear(), Asn1OctetString.CompareTo(), Asn1BMPString.Decode(), Asn1UniversalString.Decode(), and Asn1CharString.validate().

Public Member Functions

Static Public Member Functions

Properties

Detailed Description

Constructor & Destructor Documentation

◆ Asn1BerDecodeBuffer() [1/2]

◆ Asn1BerDecodeBuffer() [2/2]

Member Function Documentation

◆ CalcIndefLen()

◆ DecodeEnumValue() [1/2]

◆ DecodeEnumValue() [2/2]

◆ DecodeLength()

◆ DecodeOpenType() [1/2]

◆ DecodeOpenType() [2/2]

◆ DecodeTag()

◆ DecodeTagAndLength()

◆ MatchTag() [1/3]

◆ MatchTag() [2/3]

◆ MatchTag() [3/3]

◆ Parse()

◆ PeekTag() [1/2]

◆ PeekTag() [2/2]

◆ ReadByte()

Property Documentation

◆ LastTag