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// Package arrays provides various byte array utilities
package arrays
import (
"bytes"
"crypto/rand"
"encoding/binary"
"fmt"
"github.com/dvsekhvalnov/jose2go/base64url"
)
// Xor is doing byte by byte exclusive or of 2 byte arrays
func Xor(left, right []byte) []byte {
result := make([]byte, len(left))
for i := 0; i < len(left); i++ {
result[i] = left[i] ^ right[i]
}
return result
}
// Slice is splitting input byte array into slice of subarrays. Each of count length.
func Slice(arr []byte, count int) [][]byte {
sliceCount := len(arr) / count
result := make([][]byte, sliceCount)
for i := 0; i < sliceCount; i++ {
start := i * count
end := i*count + count
result[i] = arr[start:end]
}
return result
}
// Random generates byte array with random data of byteCount length
func Random(byteCount int) ([]byte, error) {
data := make([]byte, byteCount)
if _, err := rand.Read(data); err != nil {
return nil, err
}
return data, nil
}
// Concat combine several arrays into single one, resulting slice = A1 | A2 | A3 | ... | An
func Concat(arrays ...[]byte) []byte {
var result []byte = arrays[0]
for _, arr := range arrays[1:] {
result = append(result, arr...)
}
return result
}
// Unwrap same thing as Contact, just different interface, combines several array into single one
func Unwrap(arrays [][]byte) []byte {
var result []byte = arrays[0]
for _, arr := range arrays[1:] {
result = append(result, arr...)
}
return result
}
// UInt64ToBytes unwrap uint64 value to byte array of length 8 using big endian
func UInt64ToBytes(value uint64) []byte {
result := make([]byte, 8)
binary.BigEndian.PutUint64(result, value)
return result
}
// UInt32ToBytes unwrap uint32 value to byte array of length 4 using big endian
func UInt32ToBytes(value uint32) []byte {
result := make([]byte, 4)
binary.BigEndian.PutUint32(result, value)
return result
}
// Dump produces printable debug representation of byte array as string
func Dump(arr []byte) string {
var buf bytes.Buffer
buf.WriteString("(")
buf.WriteString(fmt.Sprintf("%v", len(arr)))
buf.WriteString(" bytes)[")
for idx, b := range arr {
buf.WriteString(fmt.Sprintf("%v", b))
if idx != len(arr)-1 {
buf.WriteString(", ")
}
}
buf.WriteString("], Hex: [")
for idx, b := range arr {
buf.WriteString(fmt.Sprintf("%X", b))
if idx != len(arr)-1 {
buf.WriteString(" ")
}
}
buf.WriteString("], Base64Url:")
buf.WriteString(base64url.Encode(arr))
return buf.String()
}
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