io.neow3j.utils

Class BigIntegers

java.lang.Object

io.neow3j.utils.BigIntegers

public class BigIntegers
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
BigIntegers()

Method Summary

Modifier and Type	Method and Description
static java.math.BigInteger	fromLittleEndianByteArray(byte[] value) Converts the integer in the given byte array to a BigInteger.
static byte[]	toLittleEndianByteArray(java.math.BigInteger value) Gets the two's complement in little-endian order of the given integer.
static byte[]	toLittleEndianByteArray(int value) Gets the two's complement in little-endian order of the given integer.
static byte[]	toLittleEndianByteArrayZeroPadded(java.math.BigInteger value, int minByteLength) Gets the two's complement in little-endian order of the given integer.
static byte[]	toLittleEndianByteArrayZeroPadded(int value, int minByteLength) Gets the two's complement in little-endian order of the given integer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BigIntegers

public BigIntegers()

Method Detail

toLittleEndianByteArray

public static byte[] toLittleEndianByteArray(java.math.BigInteger value)

Gets the two's complement in little-endian order of the given integer.

The resulting byte array is correct for usage e.g. in NEO VM scripts. The conversion behaves equally to the one used in the C#-based neo-vm implementation. It is basically how the BigIntger.toByteArray() in C# works (Cf. C# docs ).

Parameters:

value - The integer to convert.

Returns:

the byte representation of the integer.

toLittleEndianByteArray

public static byte[] toLittleEndianByteArray(int value)

Gets the two's complement in little-endian order of the given integer.

Parameters:

value - the integer to convert

Returns:

the byte representation of the integer.

See Also:

toLittleEndianByteArray(BigInteger)

toLittleEndianByteArrayZeroPadded

public static byte[] toLittleEndianByteArrayZeroPadded(java.math.BigInteger value,
                                                       int minByteLength)

Gets the two's complement in little-endian order of the given integer. If the resulting byte array is smaller than the given minimum length, it is padded with zero-valued bytes.

Parameters:

value - The integer to convert.

minByteLength - Desired length of the byte array.

Returns:

the byte representation of the integer.

Throws:

java.lang.IllegalArgumentException - if the length of the integer in bytes is bigger than the given minimum length.

See Also:

toLittleEndianByteArray(BigInteger)

toLittleEndianByteArrayZeroPadded

public static byte[] toLittleEndianByteArrayZeroPadded(int value,
                                                       int minByteLength)

Gets the two's complement in little-endian order of the given integer. If the resulting byte array is smaller than the given minimum length, it is padded with zero-valued bytes.

Parameters:

value - the integer to convert

minByteLength - Desired length of the byte array.

Returns:

the byte representation of the integer.

Throws:

java.lang.IllegalArgumentException - if the length of the integer in bytes is bigger than the given minimum length.

See Also:

toLittleEndianByteArray(BigInteger)

fromLittleEndianByteArray

public static java.math.BigInteger fromLittleEndianByteArray(byte[] value)

Converts the integer in the given byte array to a BigInteger. The integer is assumed to be in its two's complement and in little-endian order.

Parameters:

value - The byte array to convert.

Returns:

the BigInteger.