Asn1BerDecodeContext Class Reference

List of all members.

Public Member Functions
	Asn1BerDecodeContext (Asn1BerDecodeBuffer decodeBuffer, int elemLength)
virtual bool	Expired ()
virtual bool	MatchElemTag (Asn1Tag tag, IntHolder parsedLen, bool advance)
virtual bool	MatchElemTag (short tagClass, short tagForm, int tagIDCode, IntHolder parsedLen, bool advance)
Protected Attributes
internal int	mDecBufByteCount
internal Asn1BerDecodeBuffer	mDecodeBuffer
internal int	mElemLength
internal bool	mExplicitTagging
internal Asn1Tag	mTagHolder

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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.

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Constructor & Destructor Documentation

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.

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Member Function Documentation

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

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

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

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Member Data Documentation

internal int mDecBufByteCount [protected]

This variable is used to keep track of the current byte count in the Decode buffer.

internal Asn1BerDecodeBuffer mDecodeBuffer [protected]

This variable holds a reference to the BER Decode buffer object that is being used to Decode the entire message component.

internal int mElemLength [protected]

This variable holds the contructed element length for the context component.

internal bool mExplicitTagging [protected]

This boolean flag variable indictaes if explicit tagging is in effect for this element.

internal Asn1Tag mTagHolder [protected]

This variable holds the current parsed tag for matching operations.