BigInteger Class Reference

Public Member Functions
BigInteger	Add (BigInteger op)
	BigInteger ()
	BigInteger (byte[] value, int sign)
	BigInteger (System.String value)
	BigInteger (System.Int64 value)
	BigInteger (System.String value, int radix)
int	BitLength ()
virtual int	CompareTo (BigInteger value)
virtual bool	Equals (long value)
override bool	Equals (System.Object value)
byte []	GetData ()
override int	GetHashCode ()
void	Init (System.String val, int radix)
bool	IsNegative ()
long	LongValue ()
void	SecureDelete ()
void	SetData (byte[] ivalue)
BigInteger	Subtract (BigInteger op)
System.String	ToString (int radix)
override System.String	ToString ()

Static Public Member Functions
static implicit	operator BigInteger (long value)

Detailed Description

This class represents an ASN.1 INTEGER built-in type. In this case, the values can be greater than 64 bits in size. This class is used in generated source code if the <bigInteger> qualifier is specified in a compiler configuration file.

Constructor & Destructor Documentation

BigInteger() [1/5]

BigInteger

(

)

The default constructor sets the big integer value object reference to null.

BigInteger() [2/5]

BigInteger	(	byte []	value,
		int	sign
	)

This constructor creates a new big integer object and sets it to the byte[] value passed in.

Parameters

value	String value
sign	Can be -1 for negative, 0 for zero, or 1 for positive.

BigInteger() [3/5]

BigInteger

(

System.String

value

)

This constructor creates a new big integer object and sets it to the string value passed in. String value may contain the prefix that describes the radix: 0x - hexadecimal, 0o - octal, 0b - binary. The string value without prefix assumes decimal value. The optional sign '-' may be specified at the beginning of the string to specify the negative value.

Parameters

value

String value

BigInteger() [4/5]

BigInteger

(

System.Int64

value

)

This constructor creates a new big integer object and sets it to the int value passed in.

Parameters

value

Integer value

BigInteger() [5/5]

BigInteger	(	System.String	value,
		int	radix
	)

This constructor creates a new big integer object and sets it to the string value passed in. String value may contain the prefix that describes the radix: 0x - hexadecimal, 0o - octal, 0b - binary. The string value without prefix assumes decimal value. The optional sign '-' may be specified at the beginning of the string to specify the negative value.

Parameters

value	String value
radix	Can be 16 for hexadecimal, 8 for octal, 2 for binary or 10 for decimal

Member Function Documentation

Add()

BigInteger Add

(

BigInteger

op

)

Return the result of adding op to this BigInteger. Does not modify this object.

Parameters

op

Returns

Referenced by Asn1BigInteger.Decode(), and Asn1BigInteger.Encode().

BitLength()

int BitLength

(

)

Returns the number of bits in the minimal two's-complement representation of this BigInteger, excluding a sign bit. For positive BigIntegers, this is equivalent to the number of bits in the ordinary binary representation. (Computes (ceil(log2(this < 0 ? -this : this+1))).)

Returns

number of bits in the minimal two's-complement representation of this BigInteger, excluding a sign bit.

Referenced by Asn1BigInteger.Decode(), and Asn1BigInteger.Encode().

CompareTo()

virtual int CompareTo ( BigInteger  value )

virtual

This method compares this integer value to the given value.

Parameters

value

The value to compare with the current object.

Returns

-1 if this object is less than value, 0 if this object is equal to value 1 if this object is greater than value

Referenced by Asn1BigInteger.Decode(), and Asn1BigInteger.Encode().

Equals() [1/2]

virtual bool Equals ( long  value )

virtual

This method compares this integer value to the given value for equality.

Parameters

value

The long value to compare with the current Object.

Returns

true if the specified long value is equal to the current Object; otherwise, false.

Referenced by Asn1BigInteger.Decode(), Asn1BigInteger.Encode(), and Asn1BigInteger.Equals().

Equals() [2/2]

override bool Equals

(

System.Object

value

)

This method compares this integer value to the given value for equality.

Parameters

value

The Object to compare with the current Object. Object should be instance of BigInteger.

Returns

true if the specified Object is equal to the current Object; otherwise, false.

GetData()

byte [] GetData

(

)

This method provides the byte array representation of the integer value, in 2's complement form. The most significant byte is at index 0.

Returns

byte array for integer value

Referenced by Asn1BigInteger.DecodeValue(), and Asn1BigInteger.Encode().

GetHashCode()

override int GetHashCode

(

)

Serves as a hash function for a particular type, suitable for use in hashing algorithms and data structures like a hash table.

Returns

A hash code for the current Object.

Referenced by Asn1BigInteger.GetHashCode().

Init()

void Init	(	System.String	val,
		int	radix
	)

Translates the String representation of a Integer in the specified radix into a BigInteger. The String representation consists of an optional minus sign followed by a sequence of one or more digits in the specified radix. The String may not contain any extraneous Characters (whitespace, for example).

Parameters

val	String representation of Integer.
radix	radix to be used in interpreting string value.

Exceptions

System.FormatException

val is not a valid representation of a BigInteger in the specified radix, or invalid value of radix.

References Asn1Util.URShift().

IsNegative()

bool IsNegative

(

)

This method checks the Integer value is negative.

Returns

true if negative; otherwise false

LongValue()

long LongValue

(

)

Converts this BigInteger to a long. This conversion is analogous to the conversion from long to int: if this BigInteger is too big to fit in a long, only the low-order 64 bits are returned. Note that this conversion can lose information about the overall magnitude of the BigInteger value as well as return a result with the opposite sign.

Returns

this BigInteger converted to a long.

Referenced by Asn1BigInteger.Decode(), and Asn1BigInteger.Encode().

operator BigInteger()

static implicit operator BigInteger ( long  value )

static

Overloaded implicit conversion operator for long to BigInteger value

SecureDelete()

void SecureDelete

(

)

This function clears the current value (by overwritting with zeros). Than sets the value to zero, and passes the old value to garbage collector.

SetData()

void SetData

(

byte []

ivalue

)

This method sets the Integer value from byte array.

Parameters

ivalue

byte array of the integer value

Returns

Decoded integer value

See also

<seealso cref=GetData To retrieve Byte Array

Referenced by Asn1BigInteger.DecodeValue(), and Asn1BigInteger.Encode().

Subtract()

BigInteger Subtract

(

BigInteger

op

)

Subtract given op from this value and return the result. This object is not modified.

Parameters

op

Returns

Referenced by Asn1BigInteger.Decode(), and Asn1BigInteger.Encode().

ToString() [1/2]

System.String ToString

(

int

radix

)

Returns the String representation of this BigInteger in the given radix. If the radix is invalid, it will default to 10 (as is the case for Int32.ToString). The a minus sign is prepended if appropriate. This method is compatible with BigInteger(String, int) constructor.

Parameters

radix

radix of the String representation.

Returns

String representation of this BigInteger in the given radix.

See also

<seealso cref=System.Int32.ToString Integer ToString methods

Referenced by Asn1BigInteger.Decode(), Asn1BigInteger.Encode(), and Asn1BigInteger.ToString().

ToString() [2/2]

override System.String ToString

(

)

This method will return a string representation of the integer value. The format is the ASN.1 value format for this type..

Returns

Stringified representation of the value