bytesutil

Documentation

Overview

Package bytesutil defines helper methods for converting integers to byte slices.

Index

• func Bytes1(x uint64) []byte
• func Bytes2(x uint64) []byte
• func Bytes3(x uint64) []byte
• func Bytes32(x uint64) []byte
• func Bytes4(x uint64) []byte
• func Bytes8(x uint64) []byte
• func ClearBit(b []byte, i int) []byte
• func Copy2dBytes(ary [][]byte) [][]byte
• func FromBool(x bool) byte
• func FromBytes2(x []byte) uint16
• func FromBytes32(x [32]byte) []byte
• func FromBytes4(x []byte) uint64
• func FromBytes48(x [48]byte) []byte
• func FromBytes48Array(x [][48]byte) [][]byte
• func FromBytes8(x []byte) uint64
• func HighestBitIndex(b []byte) (int, error)
• func HighestBitIndexAt(b []byte, index int) (int, error)
• func LowerThan(x []byte, y []byte) bool
• func MakeEmptyBitlists(i int) []byte
• func PadTo(b []byte, size int) []byte
• func ReverseBytes32Slice(arr [][32]byte) [][32]byte
• func SafeCopyBytes(cp []byte) []byte
• func SetBit(b []byte, i int) []byte
• func ToBool(x byte) bool
• func ToBytes(x uint64, length int) []byte
• func ToBytes32(x []byte) [32]byte
• func ToBytes4(x []byte) [4]byte
• func ToBytes48(x []byte) [48]byte
• func ToBytes64(x []byte) [64]byte
• func ToBytes8(x []byte) [8]byte
• func ToBytes96(x []byte) [96]byte
• func ToLowInt64(x []byte) int64
• func Trunc(x []byte) []byte
• func Uint64ToBytes(i uint64) []byte
• func Xor(x []byte, y []byte) []byte

Functions

func Bytes1

func Bytes1(x uint64) []byte

Bytes1 returns integer x to bytes in little-endian format, x.to_bytes(1, 'big').

func Bytes2

func Bytes2(x uint64) []byte

Bytes2 returns integer x to bytes in little-endian format, x.to_bytes(2, 'big').

func Bytes3

func Bytes3(x uint64) []byte

Bytes3 returns integer x to bytes in little-endian format, x.to_bytes(3, 'big').

func Bytes32

func Bytes32(x uint64) []byte

Bytes32 returns integer x to bytes in little-endian format, x.to_bytes(8, 'little').

func Bytes4

func Bytes4(x uint64) []byte

Bytes4 returns integer x to bytes in little-endian format, x.to_bytes(4, 'little').

func Bytes8

func Bytes8(x uint64) []byte

Bytes8 returns integer x to bytes in little-endian format, x.to_bytes(8, 'little').

func ClearBit

func ClearBit(b []byte, i int) []byte

ClearBit clears the index `i` of bitlist `b`. Returns the original bitlist if the index `i` is out of range.

func Copy2dBytes

func Copy2dBytes(ary [][]byte) [][]byte

Copy2dBytes will copy and return a non-nil 2d byte array, otherwise it returns nil.

func FromBool

func FromBool(x bool) byte

FromBool is a convenience method for converting a bool to a byte. This method will use the first bit to generate the returned value.

func FromBytes2

func FromBytes2(x []byte) uint16

FromBytes2 returns an integer which is stored in the little-endian format(2, 'little') from a byte array.

func FromBytes32

func FromBytes32(x [32]byte) []byte

FromBytes32 is a convenience method for converting a fixed-size byte array to a byte slice.

func FromBytes4

func FromBytes4(x []byte) uint64

FromBytes4 returns an integer which is stored in the little-endian format(4, 'little') from a byte array.

func FromBytes48

func FromBytes48(x [48]byte) []byte

FromBytes48 is a convenience method for converting a fixed-size byte array to a byte slice.

func FromBytes48Array

func FromBytes48Array(x [][48]byte) [][]byte

FromBytes48Array is a convenience method for converting an array of fixed-size byte arrays to an array of byte slices.

func FromBytes8

func FromBytes8(x []byte) uint64

FromBytes8 returns an integer which is stored in the little-endian format(8, 'little') from a byte array.

func HighestBitIndex

func HighestBitIndex(b []byte) (int, error)

HighestBitIndex returns the index of the highest bit set from bitlist `b`.

func HighestBitIndexAt

func HighestBitIndexAt(b []byte, index int) (int, error)

HighestBitIndexAt returns the index of the highest bit set from bitlist `b` that is at `index` (inclusive).

func LowerThan

func LowerThan(x []byte, y []byte) bool

LowerThan returns true if byte slice x is lower than byte slice y. (little-endian format) This is used in spec to compare winning block root hash. Mentioned in spec as "ties broken by favoring lower `shard_block_root` values".

func MakeEmptyBitlists

func MakeEmptyBitlists(i int) []byte

MakeEmptyBitlists returns an empty bitlist with input size `i`.

func PadTo

func PadTo(b []byte, size int) []byte

PadTo pads a byte slice to the given size. If the byte slice is larger than the given size, the original slice is returned.

func ReverseBytes32Slice

func ReverseBytes32Slice(arr [][32]byte) [][32]byte

ReverseBytes32Slice will reverse the provided slice's order.

func SafeCopyBytes

func SafeCopyBytes(cp []byte) []byte

SafeCopyBytes will copy and return a non-nil byte array, otherwise it returns nil.

func SetBit

func SetBit(b []byte, i int) []byte

SetBit sets the index `i` of bitlist `b` to 1. It grows and returns a longer bitlist with 1 set if index `i` is out of range.

func ToBool

func ToBool(x byte) bool

ToBool is a convenience method for converting a byte to a bool. This method will use the first bit of the 0 byte to generate the returned value.

func ToBytes

func ToBytes(x uint64, length int) []byte

ToBytes returns integer x to bytes in little-endian format at the specified length. Spec pseudocode definition:

def int_to_bytes(integer: int, length: int) -> bytes:
  return integer.to_bytes(length, 'little')

func ToBytes32

func ToBytes32(x []byte) [32]byte

ToBytes32 is a convenience method for converting a byte slice to a fix sized 32 byte array. This method will truncate the input if it is larger than 32 bytes.

func ToBytes4

func ToBytes4(x []byte) [4]byte

ToBytes4 is a convenience method for converting a byte slice to a fix sized 4 byte array. This method will truncate the input if it is larger than 4 bytes.

func ToBytes48

func ToBytes48(x []byte) [48]byte

ToBytes48 is a convenience method for converting a byte slice to a fix sized 48 byte array. This method will truncate the input if it is larger than 48 bytes.

func ToBytes64

func ToBytes64(x []byte) [64]byte

ToBytes64 is a convenience method for converting a byte slice to a fix sized 64 byte array. This method will truncate the input if it is larger than 64 bytes.

func ToBytes8

func ToBytes8(x []byte) [8]byte

ToBytes8 is a convenience method for converting a byte slice to a fix sized 8 byte array. This method will truncate the input if it is larger than 8 bytes.

func ToBytes96

func ToBytes96(x []byte) [96]byte

ToBytes96 is a convenience method for converting a byte slice to a fix sized 96 byte array. This method will truncate the input if it is larger than 96 bytes.

func ToLowInt64

func ToLowInt64(x []byte) int64

ToLowInt64 returns the lowest 8 bytes interpreted as little endian.

func Trunc

func Trunc(x []byte) []byte

Trunc truncates the byte slices to 6 bytes.

func Uint64ToBytes

func Uint64ToBytes(i uint64) []byte

Uint64ToBytes little endian conversion.

func Xor

func Xor(x []byte, y []byte) []byte

Xor xors the bytes in x and y and returns the result.