Asn1PerEncodeBuffer Class Reference

Inheritance diagram for Asn1PerEncodeBuffer:

Public Member Functions
	Asn1PerEncodeBuffer (bool aligned, int sizeIncrement)
	Asn1PerEncodeBuffer (bool aligned)
override void	BinDump (System.IO.StreamWriter outs, System.String varName)
virtual void	ByteAlign ()
override void	Copy (byte[] value)
override void	Copy (byte value)
virtual void	EncodeBit (bool value)
virtual void	EncodeBit (bool value, System.String ident)
virtual void	EncodeBits (byte[] value, int offset, int nbits)
virtual void	EncodeBits (byte[] value, int offset, int bitOffset, int nbits, System.String ident)
virtual void	EncodeBits (byte[] value, int offset, int nbits, System.String ident)
virtual void	EncodeBits (byte value, int nbits)
virtual void	EncodeCharString (System.String value, int nchars, int offset, int abpc, int ubpc, Asn1CharSet charSet)
virtual void	EncodeConsWholeNumber (long adjustedValue, long rangeValue)
virtual void	EncodeConsWholeNumber (long adjustedValue, long rangeValue, System.String ident)
virtual void	EncodeInt (long value, bool encodeLen, bool signExtend)
virtual void	EncodeInt (long value, bool encodeLen, bool signExtend, System.String ident)
virtual void	EncodeInt (long value, int nbits)
virtual void	EncodeInt (long value, int nbits, System.String ident)
virtual void	EncodeLength (long value, long lower, long upper)
virtual long	EncodeLength (long value)
virtual void	EncodeLengthEOM (long value)
virtual void	EncodeOctetString (byte[] value, int offset, int nbytes)
virtual void	EncodeOIDLengthAndValue (int[] value)
virtual void	EncodeOpenType (Asn1PerEncodeBuffer buffer, System.String elemName)
virtual void	EncodeOpenType (byte[] value, int offset, int nbytes)
virtual void	EncodeRelOIDLengthAndValue (int[] value)
virtual void	EncodeSmallLength (int value)
virtual void	EncodeSmallNonNegWholeNumber (int value)
virtual long	EncodeUnconsLength (long value)
override System.IO.Stream	GetInputStream ()
override void	HexDump ()
virtual bool	IsAligned ()
override void	Reset ()
virtual void	ReverseBytes (int offset, int nbytes)
virtual void	SetAligned (bool value)
void	SetSizeConstraint (long lower, long upper)
void	SetSizeConstraintExt (long lower, long upper, long extLower, long extUpper)
override System.String	ToString ()
override void	Write (System.IO.Stream outs)
Protected Member Functions
internal override void	CheckSize (int bytesRequired)
Protected Attributes
internal Asn1PerTraceHandler	mTraceHandler
Properties
virtual byte[]	Buffer `[get]`
virtual System.IO.MemoryStream	ByteArrayInputStream `[get]`
virtual int	ByteIndex `[get]`
virtual int	MsgBitCnt `[get]`
virtual int	MsgByteCnt `[get]`
override byte[]	MsgCopy `[get]`
override int	MsgLength `[get]`
virtual Asn1PerTraceHandler	TraceHandler `[get]`

Detailed Description

This class handles the encoding of ASN.1 messages as specified in the Packed Encoding Rules (PER) ITU-T X.691 standard.

Constructor & Destructor Documentation

Asn1PerEncodeBuffer ( bool aligned )

This constructor creates a PER encode buffer object with the default size increment. Whenever the buffer becomes full, the buffer will be expanded by the sizeIncrement size.

Parameters:

aligned true for PER aligned or false for PER unaligned encoding.

Asn1PerEncodeBuffer	(	bool	aligned,
		int	sizeIncrement
	)

This constructor creates a PER encode buffer object with the given size increment. Whenever the buffer becomes full, the buffer will be expanded by the sizeIncrement size. This size should be large enough to prevent resizing in normal operation.

Parameters:

	aligned	`true` for PER aligned or `false` for PER unaligned encoding.
	sizeIncrement	The initial size in bytes of an encode buffer. If the buffer becomes full, it will be expanded by the amount.

Member Function Documentation

override void BinDump	(	System.IO.StreamWriter	outs,
		System.String	varName
	)			`[virtual]`

This method dumps the encoded message in a human-readable format showing a bit trace of all fields to the given print output stream.

Parameters:

	outs	StreamWriter object to which output should be written
	varName	Name of top-level message object variable

Implements Asn1EncodeBuffer.

virtual void ByteAlign ( ) [virtual]

This methods byte-aligns the buffer.

Implements Asn1PerMessageBuffer.

internal override void CheckSize ( int bytesRequired ) [protected, virtual]

This method determines if the encode buffer can hold the requested number of bytes. If not, the buffer is expanded.

Parameters:

bytesRequired

Number of required bytes.

Reimplemented from Asn1EncodeBuffer.

override void Copy ( byte[] value ) [virtual]

This method copies multiple bytes to the encode buffer

Parameters:

value

Array of bytes to copy to the encode buffer

Implements Asn1EncodeBuffer.

override void Copy ( byte value ) [virtual]

This method is used to copy a single byte to the encode buffer.

Parameters:

value

The byte value to copy

Implements Asn1EncodeBuffer.

virtual void EncodeBit ( bool value ) [virtual]

This method encodes a single bit value. The ident argument which is used for tracing is defaulted to 'value'.

Parameters:

value

Boolean value of bit to be encoded.

Implements Asn1PerEncoder.

virtual void EncodeBit	(	bool	value,
		System.String	ident
	)			`[virtual]`

This method encodes a single bit value.

Parameters:

	value	Boolean value of bit to be encoded.
	ident	Bit field identifier name for tracing.

Implements Asn1PerEncoder.

virtual void EncodeBits	(	byte[]	value,
		int	offset,
		int	nbits
	)			`[virtual]`

This method encodes bit values from an array of octets. The ident argument which is used for tracing is defaulted to 'value'.

Parameters:

	value	Octet array containing bits to be encoded
	offset	Starting byte offset in value
	nbits	Number of bits to encode

Implements Asn1PerEncoder.

virtual void EncodeBits	(	byte[]	value,
		int	offset,
		int	bitOffset,
		int	nbits,
		System.String	ident
	)			`[virtual]`

This method encodes bit values from an array of octets.

Parameters:

	value	Octet array containing bits to be encoded
	offset	Starting byte offset in value
	bitOffset	Starting bit offset in first byte. For example, passing 0 would begin encoding with the most significant bit, while passing 7 would begin encoding with the least significant bit.
	nbits	Number of bits to encode
	ident	Bit field identifier name for tracing.

virtual void EncodeBits	(	byte[]	value,
		int	offset,
		int	nbits,
		System.String	ident
	)			`[virtual]`

This method encodes bit values from an array of octets.

Parameters:

	value	Octet array containing bits to be encoded
	offset	Starting byte offset in value
	nbits	Number of bits to encode
	ident	Bit field identifier name for tracing.

Implements Asn1PerEncoder.

virtual void EncodeBits	(	byte	value,
		int	nbits
	)			`[virtual]`

This method encodes bit values from an octet. The most significant bits from the octet are encoded.

Parameters:

	value	Octet containing bits to be encoded
	nbits	Number of bits to encode

Implements Asn1PerEncoder.

virtual void EncodeCharString	(	System.String	value,
		int	nchars,
		int	offset,
		int	abpc,
		int	ubpc,
		Asn1CharSet	charSet
	)			`[virtual]`

This method encodes the contents of a known-multiplier character string type. This version assumes a permitted alphabet constraint was specified.

Parameters:

	value	String containing characters to encode
	nchars	Number of characters from string to encode
	offset	Offset to first char in string to encode
	abpc	Number of bits per character (aligned)
	ubpc	Number of bits per character (unaligned)
	charSet	Object representing permitted alphabet constraint character set (optional)

Implements Asn1PerEncoder.

virtual void EncodeConsWholeNumber	(	long	adjustedValue,
		long	rangeValue
	)			`[virtual]`

This method implements the rules to encode a constrained whole number as specified in section 10.5 of the X.691 standard. The ident argument which is used for tracing is defaulted to 'value'.

Parameters:

	adjustedValue	Adjusted value to be encoded = value - lower range endpoint value
	rangeValue	lower - upper + 1

Implements Asn1PerEncoder.

virtual void EncodeConsWholeNumber	(	long	adjustedValue,
		long	rangeValue,
		System.String	ident
	)			`[virtual]`

This method implements the rules to encode a constrained whole number as specified in section 10.5 of the X.691 standard.

Parameters:

	adjustedValue	Adjusted value to be encoded = value - lower range endpoint value
	rangeValue	lower - upper + 1
	ident	Tracing identifier

Implements Asn1PerEncoder.

virtual void EncodeInt	(	long	value,
		bool	encodeLen,
		bool	signExtend
	)			`[virtual]`

This method implements the rules to encode either a non-negative binary integer as specified in section 10.3 or a two's complement binary integer as specified in section 10.4 of the X.691 standard. The ident argument which is used for tracing is defaulted to 'value'.

Parameters:

	value	Integer value to be encoded
	encodeLen	Flag indicating length determinant should be encoded before encoding integer value.
	signExtend	Flag indicating if sign extension should be performed.

Implements Asn1PerEncoder.

virtual void EncodeInt	(	long	value,
		bool	encodeLen,
		bool	signExtend,
		System.String	ident
	)			`[virtual]`

This method implements the rules to encode either a non-negative binary integer as specified in section 10.3 or a two's complement binary integer as specified in section 10.4 of the X.691 standard.

Parameters:

	value	Integer value to be encoded
	encodeLen	Flag indicating length determinant should be encoded before encoding integer value.
	signExtend	Flag indicating if sign extension should be performed.
	ident	Tracing identifier

Implements Asn1PerEncoder.

virtual void EncodeInt	(	long	value,
		int	nbits
	)			`[virtual]`

This method encodes bit values from an integer value. The least significant bits from the integer are encoded. The ident argument which is used for tracing is defaulted to 'value'.

Parameters:

	value	Integer containing bits to be encoded
	nbits	Number of bits to encode

Implements Asn1PerEncoder.

virtual void EncodeInt	(	long	value,
		int	nbits,
		System.String	ident
	)			`[virtual]`

This method encodes bit values from an integer value. The least significant bits from the integer are encoded.

Parameters:

	value	Integer containing bits to be encoded
	nbits	Number of bits to encode
	ident	Tracing identifier

Implements Asn1PerEncoder.

virtual void EncodeLength	(	long	value,
		long	lower,
		long	upper
	)			`[virtual]`

This method encodes a constrained length determinant value.

Parameters:

	value	Length value to be encoded
	lower	Lower bound (inclusive) of length value range
	upper	Upper bound (inclusive) of length value range

Implements Asn1PerEncoder.

virtual long EncodeLength ( long value ) [virtual]

This method encodes either a constrained or unconstrained length depending on whether a size constraint object is set in this object.

Parameters:

value

Length value to be encoded

Returns:: Value that was actually encoded. This may be less than the value that was passed in if fragementation was done (i.e the value was >= 16k).

Implements Asn1PerEncoder.

virtual void EncodeLengthEOM ( long value ) [virtual]

This method checks to see if a zero byte needs to be added after a fragmented length has been encoded. It will add it to the byte stream if necessary.

Parameters:

value

Original length value that was encoded.

Implements Asn1PerEncoder.

virtual void EncodeOctetString	(	byte[]	value,
		int	offset,
		int	nbytes
	)			`[virtual]`

This method encodes the given array of bytes as an unconstrained octet string value.

Parameters:

	value	Byte array containing data to encode. This is assumed to contain a previously encoded PER component.
	offset	Starting offset in byte array value
	nbytes	Number of bytes to encode

Implements Asn1PerEncoder.

virtual void EncodeOIDLengthAndValue ( int[] value ) [virtual]

This method encodes the length and contents of an object identifier value.

Parameters:

value

Integer array containing arcs to encode

Implements Asn1PerEncoder.

virtual void EncodeOpenType	(	Asn1PerEncodeBuffer	buffer,
		System.String	elemName
	)			`[virtual]`

This overloaded version of encodeOpenType will encode the componet in the given PER encode buffer into this PER encode buffer.

Parameters:

	buffer	PER encode buffer containing encoded message component.
	elemName	Name of element being encoded.

virtual void EncodeOpenType	(	byte[]	value,
		int	offset,
		int	nbytes
	)			`[virtual]`

This method encodes the given array of bytes as an open type.

Parameters:

	value	Byte array containing data to encode. This is assumed to contain a previously encoded PER component.
	offset	Starting offset in byte array value
	nbytes	Number of bytes to encode

Implements Asn1PerEncoder.

virtual void EncodeRelOIDLengthAndValue ( int[] value ) [virtual]

This method encodes the length and contents of a relative object identifier value.

Parameters:

value

Integer array containing arcs to encode

Implements Asn1PerEncoder.

virtual void EncodeSmallLength ( int value ) [virtual]

This method implements the rules to encode a normally small length as specified in section 11.9 of the X.691 standard.

Parameters:

value

Value to be encoded

Implements Asn1PerEncoder.

virtual void EncodeSmallNonNegWholeNumber ( int value ) [virtual]

This method implements the rules to encode a small non-negative whole number as specified in section 10.6 of the X.691 standard.

Parameters:

value

Value to be encoded

Implements Asn1PerEncoder.

virtual long EncodeUnconsLength ( long value ) [virtual]

This method encodes a general (unconstrained) length determinant value as described in section 10.9 or the X.691 standard.

Parameters:

value

Length value to be encoded

Returns:: Value that was actually encoded. This may be less than the value that was passed in if fragementation was done (i.e the value was >= 16k).

override System.IO.Stream GetInputStream ( )

This method returns an input stream representing the encoded message. This method is defined as abstract in the base class and must be implemented by all derived classes. In this case, a byte array input stream is returned.

Returns:: Input stream containing encoded message

Implements Asn1PerMessageBuffer.

override void HexDump ( ) [virtual]

This method dumps the encoded message in hex/ascii format to the standard output stream.

Reimplemented from Asn1EncodeBuffer.

virtual bool IsAligned ( ) [virtual]

This method is used to test if PER aligned encoding has been specified.

Returns:: true for PER aligned encoding or false for unaligned encoding.

Implements Asn1PerMessageBuffer.

override void Reset ( ) [virtual]

This method resets the buffer object so that it can be reused to encode another PER message. Any previously encoded data is lost.

Implements Asn1EncodeBuffer.

virtual void ReverseBytes	(	int	offset,
		int	nbytes
	)			`[virtual]`

This method reverses a series of bytes at a given offset within the encode buffer.

Parameters:

	offset	Starting byte offset within the buffer
	nbytes	Number of bytes to reverse

virtual void SetAligned ( bool value ) [virtual]

This method is used to turn PER aligned encoding on or off

Parameters:

value true for PER aligned encoding or false for unaligned encoding.

void SetSizeConstraint	(	long	lower,
		long	upper
	)

This method is used to set a size constraint within the buffer object. The constraint will only be set if an existing constraint is not already in place (i.e. if the existing reference is not null). This is used for length decoding of SEQUENCE OF objects to pass constraints applied to referenced objects to the base object.

void SetSizeConstraintExt	(	long	lower,
		long	upper,
		long	extLower,
		long	extUpper
	)

This method is used to set an extensible size constraint in the buffer object. The constraint will only be set if an existing constraint is not already in place (i.e. if the existing reference is not null). This is used for length encoding of SEQUENCE OF objects to pass constraints applied to referenced objects to the base object.

override System.String ToString ( )

This method will return a string representation of the data in the encode buffer. The format is hex characters.

Returns:: Stringified representation of the value

override void Write ( System.IO.Stream outs ) [virtual]

This method writes the encoded record to the given output stream.

Parameters:

outs

Output stream to which record is to be written

Implements Asn1EncodeBuffer.

Member Data Documentation

internal Asn1PerTraceHandler mTraceHandler [protected]

Variable holds the PER message trace handler

Property Documentation

virtual byte [] Buffer [get]

Gets a reference to the byte buffer used to hold the encoded message.

Value: Byte buffer reference

virtual System.IO.MemoryStream ByteArrayInputStream [get]

Gets a reference to a byte array input stream representing the encoded message. This is the preferred way to access the contents of the encoded message as it is the most efficient.

Value: byte array input stream containing encoded message

virtual int ByteIndex [get]

Gets the current byte index into the encode buffer.

Value: Byte index value

virtual int MsgBitCnt [get]

Gets the number of bits in the encoded PER message.

Value: Count of bits in encoded message

Implements Asn1PerMessageBuffer.

virtual int MsgByteCnt [get]

Gets the number of bytes in the encoded PER message. The number is rounded up to include the last byte if one or more bits have been set in that byte.

Value: Count of bytes in encoded message

override byte [] MsgCopy [get]

Gets the encoded message in a byte array. This is less efficient than the ByteArrayInputStream property because the message contents must be copied to a newly created byte array.

Value: byte array containing encoded message

Reimplemented from Asn1EncodeBuffer.

override int MsgLength [get]

Gets the length (in bytes) of the encoded message component.

Value: length of encoded message component

Reimplemented from Asn1EncodeBuffer.

virtual Asn1PerTraceHandler TraceHandler [get]

Gets a reference to the internal trace handler object used to trace the bit fields within a PER message.

Value: Asn1PerTraceHandler object

Implements Asn1PerMessageBuffer.

Asn1PerEncodeBuffer Class Reference

Public Member Functions

Protected Member Functions

Protected Attributes

Properties

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

Property Documentation