common

Documentation

Overview

Package common contains various helper functions.

Index

• Constants
• Variables
• func BigToAddress(b *big.Int) fixtures.Address
• func BigToHash(b *big.Int) fixtures.Hash
• func Bytes2Hex(d []byte) string
• func BytesToHash(b []byte) fixtures.Hash
• func CopyBytes(b []byte) (copiedBytes []byte)
• func FromHex(s string) []byte
• func Hex2Bytes(str string) []byte
• func Hex2BytesFixed(str string, flen int) []byte
• func HexToAddress(s string) fixtures.Address
• func HexToHash(s string) fixtures.Hash
• func IsHex(str string) bool
• func IsHexAddress(s string) bool
• func IsOxPrefixedHex(str string) bool
• func LeftPadBytes(slice []byte, l int) []byte
• func RightPadBytes(slice []byte, l int) []byte
• func ToHex(b []byte) string
• func ToHexArray(b [][]byte) []string

Constants

const (
	// HashLength is the expected length of the hash
	HashLength = 32
	// AddressLength is the expected length of the address
	AddressLength = 20
)

Lengths of hashes and addresses in bytes.

Variables

var (
	Big1   = big.NewInt(1)
	Big2   = big.NewInt(2)
	Big3   = big.NewInt(3)
	Big0   = big.NewInt(0)
	Big32  = big.NewInt(32)
	Big256 = big.NewInt(256)
	Big257 = big.NewInt(257)
)

Common big integers often used

Functions

func BigToAddress

func BigToAddress(b *big.Int) fixtures.Address

BigToAddress returns Address with byte values of b. If b is larger than len(h), b will be cropped from the left.

func BigToHash

func BigToHash(b *big.Int) fixtures.Hash

BigToHash sets byte representation of b to hash. If b is larger than len(h), b will be cropped from the left.

func Bytes2Hex

func Bytes2Hex(d []byte) string

Bytes2Hex returns the hexadecimal encoding of d.

func BytesToHash

func BytesToHash(b []byte) fixtures.Hash

BytesToHash sets b to hash. If b is larger than len(h), b will be cropped from the left.

func CopyBytes

func CopyBytes(b []byte) (copiedBytes []byte)

CopyBytes returns an exact copy of the provided bytes.

func FromHex

func FromHex(s string) []byte

FromHex returns the bytes represented by the hexadecimal string s. s may be prefixed with "0x".

func Hex2Bytes

func Hex2Bytes(str string) []byte

Hex2Bytes returns the bytes represented by the hexadecimal string str.

func Hex2BytesFixed

func Hex2BytesFixed(str string, flen int) []byte

Hex2BytesFixed returns bytes of a specified fixed length flen.

func HexToAddress

func HexToAddress(s string) fixtures.Address

HexToAddress returns Address with byte values of s. If s is larger than len(h), s will be cropped from the left.

func HexToHash

func HexToHash(s string) fixtures.Hash

HexToHash sets byte representation of s to hash. If b is larger than len(h), b will be cropped from the left.

func IsHex

func IsHex(str string) bool

IsHex validates whether each byte is valid hexadecimal string.

func IsHexAddress

func IsHexAddress(s string) bool

IsHexAddress verifies whether a string can represent a valid hex-encoded Ethereum address or not.

func IsOxPrefixedHex

func IsOxPrefixedHex(str string) bool

IsHex validates whether each byte is valid hexadecimal string.

func LeftPadBytes

func LeftPadBytes(slice []byte, l int) []byte

LeftPadBytes zero-pads slice to the left up to length l.

func RightPadBytes

func RightPadBytes(slice []byte, l int) []byte

RightPadBytes zero-pads slice to the right up to length l.

func ToHex

func ToHex(b []byte) string

ToHex returns the hex representation of b, prefixed with '0x'. For empty slices, the return value is "0x0".

Deprecated: use hexutil.Encode instead.

func ToHexArray

func ToHexArray(b [][]byte) []string

ToHexArray creates a array of hex-string based on []byte