Asn1BerDecodeContext Class Reference

Public Member Functions
	Asn1BerDecodeContext (Asn1BerDecodeBuffer decodeBuffer, int elemLength)
virtual bool	Expired ()
virtual bool	MatchElemTag (short tagClass, short tagForm, int tagIDCode, IntHolder parsedLen, bool advance)
virtual bool	MatchElemTag (Asn1Tag tag, IntHolder parsedLen, bool advance)

Detailed Description

This class is mainly for internal use by the compiler to keep track of where nested constructed elements (SEQUENCE, SET, CHOICE, etc.) begin and end.

Constructor & Destructor Documentation

Asn1BerDecodeContext()

Asn1BerDecodeContext	(	Asn1BerDecodeBuffer	decodeBuffer,
		int	elemLength
	)

The constructor initializes all internal working varaibles.

Parameters

decodeBuffer	Reference to current Decode buffer method.
elemLength	Length of the element being tracked.

References Asn1DecodeBuffer.ByteCount, and Diag.Prtln().

Member Function Documentation

Expired()

virtual bool Expired ( )

virtual

This method will determine if a decoding context is expired. A context is defined to be the wrapper in which a set of elements or a primitive data type resides..

Returns

True if at the end of the context block

References Asn1DecodeBuffer.ByteCount, Asn1Type.EOC, Asn1Status.INDEFLEN, Asn1BerDecodeBuffer.MatchTag(), Asn1Tag.PRIM, Asn1DecodeBuffer.Reset(), and Asn1Tag.UNIV.

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

MatchElemTag() [1/2]

virtual bool MatchElemTag ( short  tagClass, short  tagForm, int  tagIDCode, IntHolder  parsedLen, bool  advance  )

virtual

This method will attempt to match the next element tag in a constructed type with the expected value. It will check to see if the context is expired and, if not, will match the given tag with the expected tag. The Decode cursor is advanced if the boolean advance argument is true.

Parameters

tagClass	Class value of tag to match
tagForm	Form value of tag to match
tagIDCode	ID code of tag to match
parsedLen	Holder object to receive parsed length value
advance	True if Decode cursor to be advanced.

Returns

True, if the tag is matched

References Asn1DecodeBuffer.ByteCount, Asn1Status.INDEFLEN, Asn1BerDecodeBuffer.MatchTag(), IntHolder.mValue, and Asn1DecodeBuffer.Reset().

MatchElemTag() [2/2]

virtual bool MatchElemTag ( Asn1Tag  tag, IntHolder  parsedLen, bool  advance  )

virtual

This method will attempt to match the next element tag in a constructed type with the expected value. It will check to see if the context is expired and, if not, will match the given tag with the expected tag. The Decode cursor is advanced if the boolean advance argument is true.

Parameters

tag	Tag object representing tag to be matched.
parsedLen	Holder object to receive parsed length value
advance	True if Decode cursor to be advanced.

Returns

True, if the tag is matched

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