Asn1Tag Class Reference

Public Member Functions
	Asn1Tag ()
	Asn1Tag (short tagclass, short form, int idCode)
virtual bool	Equals (short tagclass, short form, int idCode)
bool	Equals (Asn1Tag tag)
virtual bool	IsEOC ()
override System.String	ToString ()

Public Attributes
const short	APPL = (short) (0x40)
const short	Bit8Mask = (short) (0x80)
const short	ClassMask = (short) (0xC0)
const short	CONS = (short) (0x20)
const short	CTXT = (short) (0x80)
const bool	EXPL = true
const short	EXTIDCODE = (short) (0x1F)
const short	FormMask = (short) (0x20)
const short	IDMask = (short) (0x1F)
const bool	IMPL = false
const short	L7BitsMask = (short) (0x7f)
short	mClass
short	mForm
int	mIDCode
const short	PRIM = (short) (0x00)
const short	PRIV = (short) (0xC0)
const short	UNIV = (short) (0x00)

Static Public Attributes
static readonly Asn1Tag	ENUM
static readonly Asn1Tag	EOC
static readonly Asn1Tag	SEQUENCE
static readonly Asn1Tag	SET

Properties
virtual bool	Constructed [get]

Detailed Description

This is a container class for holding the components of an ASN.1 tag value.

Constructor & Destructor Documentation

Asn1Tag() [1/2]

Asn1Tag

(

)

The default constructor initializes all fields to zero

Asn1Tag() [2/2]

Asn1Tag	(	short	tagclass,
		short	form,
		int	idCode
	)

This constructor initializes all fields to the given values

Parameters

tagclass	Tag class value (UNIV, APPL, CTXT, or PRIV)
form	Tag form value (PRIM or CONS)
idCode	Tag identifier code

Member Function Documentation

Equals() [1/2]

virtual bool Equals ( short  tagclass, short  form, int  idCode  )

virtual

This method compares this tag with the given tag value for equality.

Parameters

tagclass	Tag class value (UNIV, APPL, CTXT, or PRIV)
form	Tag form value (PRIM or CONS)
idCode	Tag identifier code

Returns

true if the specified Tags are equal; otherwise, false.

Referenced by Asn1BerDecodeBuffer.MatchTag().

Equals() [2/2]

bool Equals

(

Asn1Tag

tag

)

This method compares this tag with the given tag value for equality.

Parameters

tag	Asn1Tag object to which this tag is to be compared

Returns

true if the specified Tags are equal; otherwise, false.

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

IsEOC()

virtual bool IsEOC ( )

virtual

This method tests if the tag is an end-of-contents (EOC) tag.

Returns

True if tag is an EOC.

References Asn1Type.EOC.

Referenced by Asn1BerDecodeBuffer.CalcIndefLen(), Asn1BerDecodeBuffer.DecodeOpenType(), and Asn1BerDecodeBuffer.Parse().

ToString()

override System.String ToString

(

)

This method will return a formatted string representing the tag value. The form is "[<class> <ID>]" (i.e. the ASN.1 standard syntax for a tag value).

Returns

Formatted tag string

References Asn1Type.ENUMERATED, Asn1Type.EOC, Asn1Type.SEQUENCE, and Asn1Type.SET.

Referenced by Asn1BerDecodeBuffer.DecodeTag(), and Asn1BerMessageDumpHandler.StartElement().

Member Data Documentation

APPL

const short APPL = (short) (0x40)

Mask value for an APPLICATION tag

Bit8Mask

const short Bit8Mask = (short) (0x80)

Bit 8 (MSB) octet mask value

Referenced by Asn1BerDecodeBuffer.DecodeTag().

ClassMask

const short ClassMask = (short) (0xC0)

Mask value to mask the class bits from a tag

Referenced by Asn1BerDecodeBuffer.DecodeTag().

CONS

const short CONS = (short) (0x20)

Mask value for CONSTRUCTED form

Referenced by Asn1BerDecodeBuffer.DecodeEnumValue(), Asn1CerOutputStream.EncodeBitString(), Asn1CerOutputStream.EncodeBMPString(), Asn1CerOutputStream.EncodeCharString(), Asn1CerOutputStream.EncodeOctetString(), Asn1CerOutputStream.EncodeStringTag(), and Asn1CerOutputStream.EncodeUnivString().

CTXT

const short CTXT = (short) (0x80)

Mask value for a context-specific tag

ENUM

readonly Asn1Tag ENUM

static

ASN.1 ENUMERATED type tag value

EOC

readonly Asn1Tag EOC

static

ASN.1 end-of-contents (EOC) type tag value

Referenced by Asn1UTF8String.Asn1UTF8String(), Asn1BitString.Clear(), Asn1OctetString.CompareTo(), Asn1BMPString.Decode(), Asn1UniversalString.Decode(), and Asn1CharString.validate().

EXPL

const bool EXPL = true

This specifies that explicit tagging should be used.

Referenced by Asn1Type.Decode().

EXTIDCODE

const short EXTIDCODE = (short) (0x1F)

Mask value for extended tag identifier indicator

Referenced by Asn1BerDecodeBuffer.DecodeTag(), Asn1BerOutputStream.EncodeTag(), and Asn1BerEncodeBuffer.EncodeTag().

FormMask

const short FormMask = (short) (0x20)

Mask value to mask the form bit from a tag

Referenced by Asn1BerDecodeBuffer.DecodeTag().

IDMask

const short IDMask = (short) (0x1F)

Mask value to mask the tag ID bits from a tag

Referenced by Asn1BerDecodeBuffer.DecodeTag().

IMPL

const bool IMPL = false

This specifies that implicit tagging should be used.

L7BitsMask

const short L7BitsMask = (short) (0x7f)

Lower 7 bits octet mask value

Referenced by Asn1BerDecodeBuffer.DecodeLength(), and Asn1BerDecodeBuffer.DecodeTag().

mClass

short mClass

Tag class value (UNIV, APPL, CTXT, or PRIV)

Referenced by Asn1Type._SetKey(), Asn1OerDecodeBuffer.DecodeTag(), Asn1BerDecodeBuffer.DecodeTag(), Asn1ChoiceExt.Encode(), Asn1CerOutputStream.EncodeBitString(), Asn1CerOutputStream.EncodeBMPString(), Asn1CerOutputStream.EncodeCharString(), Asn1CerOutputStream.EncodeOctetString(), Asn1CerOutputStream.EncodeStringTag(), Asn1BerOutputStream.EncodeTag(), Asn1BerEncodeBuffer.EncodeTag(), Asn1CerOutputStream.EncodeUnivString(), Asn1Tag.Equals(), Asn1BerDecodeContext.MatchElemTag(), and Asn1BerDecodeBuffer.MatchTag().

mForm

short mForm

Tag form value (PRIM or CONS)

Referenced by Asn1Type._SetKey(), Asn1BerDecodeBuffer.DecodeEnumValue(), Asn1BerDecodeBuffer.DecodeTag(), Asn1BerOutputStream.EncodeTag(), Asn1BerEncodeBuffer.EncodeTag(), Asn1Tag.Equals(), Asn1BerDecodeContext.MatchElemTag(), and Asn1BerDecodeBuffer.MatchTag().

mIDCode

int mIDCode

Tag ID code

Referenced by Asn1Type._SetKey(), Asn1OerDecodeBuffer.DecodeTag(), Asn1BerDecodeBuffer.DecodeTag(), Asn1ChoiceExt.Encode(), Asn1CerOutputStream.EncodeBitString(), Asn1CerOutputStream.EncodeBMPString(), Asn1CerOutputStream.EncodeCharString(), Asn1CerOutputStream.EncodeOctetString(), Asn1CerOutputStream.EncodeStringTag(), Asn1BerOutputStream.EncodeTag(), Asn1BerEncodeBuffer.EncodeTag(), Asn1CerOutputStream.EncodeUnivString(), Asn1Tag.Equals(), Asn1BerDecodeContext.MatchElemTag(), Asn1BerDecodeBuffer.MatchTag(), and Asn1CharString.validate().

PRIM

const short PRIM = (short) (0x00)

Mask value for PRIMITIVE form

Referenced by Asn1IA5String.Asn1IA5String(), Asn1Time.Asn1Time(), Asn1GeneralizedTime.CompareTo(), Asn1UTCTime.CompareTo(), Asn1BerDecodeBuffer.DecodeEnumValue(), Asn1RelativeOID.DecodeXML(), Asn1ObjectDescriptor.Encode(), Asn1GraphicString.Encode(), Asn1GeneralString.Encode(), Asn1VisibleString.Encode(), Asn1VideotexString.Encode(), Asn1T61String.Encode(), Asn1PrintableString.Encode(), Asn1NumericString.Encode(), Asn1Date.Encode(), Asn1Duration.Encode(), Asn1TimeOfDay.Encode(), Asn1DateTime.Encode(), Asn1X694OrderElement.Encode(), Asn1BMPString.Encode(), Asn1UTF8String.Encode(), Asn1Real10.Encode(), Asn1Integer.Encode(), Asn1UniversalString.Encode(), Asn1BitString.Encode(), Asn1OctetString.EncodeBase64Binary(), Asn1BerDecodeContext.Expired(), Asn1Real.NormalizedRealValueToString(), Asn1Null.ToString(), Asn1Enumerated.ToString(), Asn1Boolean.ToString(), and Asn1ObjectIdentifier.ToString().

PRIV

const short PRIV = (short) (0xC0)

Mask value for a PRIVATE tag

SEQUENCE

readonly Asn1Tag SEQUENCE

static

ASN.1 SEQUENCE type tag value

SET

readonly Asn1Tag SET

static

ASN.1 SET type tag value

UNIV

const short UNIV = (short) (0x00)

Mask value for a UNIVERSAL tag

Referenced by Asn1IA5String.Asn1IA5String(), Asn1Time.Asn1Time(), Asn1GeneralizedTime.CompareTo(), Asn1UTCTime.CompareTo(), Asn1BerDecodeBuffer.DecodeEnumValue(), Asn1RelativeOID.DecodeXML(), Asn1ObjectDescriptor.Encode(), Asn1GraphicString.Encode(), Asn1GeneralString.Encode(), Asn1VisibleString.Encode(), Asn1VideotexString.Encode(), Asn1T61String.Encode(), Asn1PrintableString.Encode(), Asn1NumericString.Encode(), Asn1Date.Encode(), Asn1Duration.Encode(), Asn1TimeOfDay.Encode(), Asn1DateTime.Encode(), Asn1X694OrderElement.Encode(), Asn1BMPString.Encode(), Asn1UTF8String.Encode(), Asn1Real10.Encode(), Asn1Integer.Encode(), Asn1UniversalString.Encode(), Asn1BitString.Encode(), Asn1OctetString.EncodeBase64Binary(), Asn1BerDecodeContext.Expired(), Asn1Real.NormalizedRealValueToString(), Asn1Null.ToString(), Asn1Enumerated.ToString(), Asn1Boolean.ToString(), and Asn1ObjectIdentifier.ToString().

Property Documentation

Constructed

virtual bool Constructed

get

Gets the tag is constructed.

Value: true if tag is constructed; otherwise false.

Referenced by Asn1BitString.Clear(), Asn1OctetString.CompareTo(), Asn1BMPString.Decode(), Asn1UniversalString.Decode(), Asn1BerDecodeBuffer.Parse(), Asn1BerMessageDumpHandler.StartElement(), and Asn1CharString.validate().