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binutil.go
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binutil.go
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package binutil
import (
"bytes"
"encoding/binary"
"encoding/gob"
"errors"
"fmt"
"math"
"math/big"
"math/rand"
"os"
"regexp"
"strconv"
"time"
)
var (
alphabetRunes = []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
alphanumericRunes = []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
digitRunes = []rune("0123456789")
hexRunes = []rune("0123456789ABCDEF")
)
// GenerateNLengthAlphabetString returns random alphabet rune for n length
func GenerateNLengthAlphabetString(n int) string {
b := make([]rune, n)
rand.Seed(time.Now().UTC().UnixNano())
for i := range b {
b[i] = alphabetRunes[rand.Intn(len(alphabetRunes))]
}
return string(b)
}
// GenerateNLengthAlphanumericString returns random alphanumeric rune for n length
func GenerateNLengthAlphanumericString(n int) string {
b := make([]rune, n)
rand.Seed(time.Now().UTC().UnixNano())
for i := range b {
b[i] = alphanumericRunes[rand.Intn(len(alphanumericRunes))]
}
return string(b)
}
// GenerateNLengthDigitString returns random digit rune for n length
func GenerateNLengthDigitString(n int) string {
b := make([]rune, n)
rand.Seed(time.Now().UTC().UnixNano())
for i := range b {
b[i] = digitRunes[rand.Intn(len(digitRunes))]
}
return string(b)
}
// GenerateNLengthHexString returns random hex rune for n length
func GenerateNLengthHexString(n int) string {
b := make([]rune, n)
rand.Seed(time.Now().UTC().UnixNano())
for i := range b {
b[i] = hexRunes[rand.Intn(len(hexRunes))]
}
return string(b)
}
// GenerateNLengthRandomBinRuneSlice returns n-length random binary string
// max == 0 for no cap limit
func GenerateNLengthRandomBinRuneSlice(n int, max uint) ([]rune, uint) {
binstr := make([]rune, n)
sum := uint(0)
rand.Seed(time.Now().UTC().UnixNano())
for i := 0; i < n; i++ {
var b rune
if max != uint(0) && max < uint(math.Pow(float64(2), float64(n-i))) {
b = '0'
} else if rand.Intn(2) == 0 {
b = '0'
} else {
b = '1'
}
binstr[i] = b
if b == '1' {
sum += uint(math.Pow(float64(2), float64(n-i-1)))
}
}
if max != uint(0) && max < sum {
binstr, sum = GenerateNLengthRandomBinRuneSlice(n, max)
}
return binstr, sum
}
// GenerateNLengthZeroPaddingRuneSlice returns n-length zero padding string
func GenerateNLengthZeroPaddingRuneSlice(n int) []rune {
binstr := make([]rune, n)
for i := 0; i < n; i++ {
binstr[i] = '0'
}
return binstr
}
// GenerateRandomInt return random int value with min-max
func GenerateRandomInt(min, max int) int {
rand.Seed(time.Now().UTC().UnixNano())
return rand.Intn(max-min) + min
}
// Pack the data into (partial) LLRP packet payload.
func Pack(data []interface{}) []byte {
buf := new(bytes.Buffer)
for _, v := range data {
binary.Write(buf, binary.BigEndian, v)
}
return buf.Bytes()
}
// Parse6BinRuneSliceToRune translate 6 rune slices into a 6-bit encoded rune
func Parse6BinRuneSliceToRune(r []rune) (rune, error) {
if len(r) != 6 {
return 0, errors.New("Given rune should be exactley len=6")
}
i, err := strconv.ParseInt(string(r), 2, 64)
if err != nil {
return 0, err
}
if (48&i)>>4 < 2 {
i |= 64
}
return rune(i), nil
}
// ParseBinRuneSliceToUint8Slice returns uint8 slice from binary string
// Precondition: len(bs) % 8 == 0
func ParseBinRuneSliceToUint8Slice(bs []rune) ([]uint8, error) {
if len(bs)%8 != 0 {
fmt.Printf("len(bs): %v\n", len(bs))
return nil, errors.New("non-8 bit length binary string passed to ParseBinRuneSliceToUint8Slice: " + string(bs))
} else if len(bs) < 8 {
return nil, errors.New("binary string length less than 8 given to ParseBinRuneSliceToUint8Slice")
}
bsSize := len(bs) / 8
uints := make([]uint8, bsSize)
for j := 0; j < bsSize; j++ {
uintRep := uint8(0)
for i := 0; i < 8; i++ {
if bs[j*8-i+7] == '1' {
uintRep += uint8(math.Pow(float64(2), float64(i)))
}
}
uints[j] = uintRep
}
return uints, nil
}
// ParseBinRuneSliceToInt returns int value of the binary string
func ParseBinRuneSliceToInt(bs []rune) int {
i, err := strconv.ParseInt(string(bs), 2, 32)
if err != nil {
panic(err)
}
return int(i)
}
// ParseBinStringToDecArrayString
func ParseBinStringToDecArrayString(s string) (string, error) {
re := regexp.MustCompile("[^01]")
if re.FindStringIndex(s) != nil || len(s)%8 != 0 {
return "", errors.New("Input to ParseBinStringToHexString is not a bin string")
}
ds := ""
for i := 0; i < len(s); i += 8 {
v, err := strconv.ParseInt(s[i:i+8], 2, 16)
if err != nil {
return ds, nil
}
if i == 0 {
ds = fmt.Sprintf("%v", v)
} else {
ds = fmt.Sprintf("%s, %v", ds, v)
}
}
return ds, nil
}
// ParseBinStringToHexString returns Hex string
func ParseBinStringToHexString(s string) (string, error) {
re := regexp.MustCompile("[^01]")
if re.FindStringIndex(s) != nil || len(s)%8 != 0 {
return "", errors.New("Input to ParseBinStringToHexString is not a bin string")
}
var hs string
for i := 0; i < len(s); i += 4 {
n := (int(s[i])-48)*8 + (int(s[i+1])-48)*4 + (int(s[i+2])-48)*2 + (int(s[i+3])-48)*1
hs = fmt.Sprintf("%s%x", hs, n)
}
return hs, nil
}
// ParseByteSliceToBinString returns run slice of bytes
func ParseByteSliceToBinString(bys []byte) string {
bs := ""
for _, b := range bys {
bs += fmt.Sprintf("%.8b", b)
}
return bs
}
// ParseDecimalStringToBinRuneSlice convert serial to binary rune slice
func ParseDecimalStringToBinRuneSlice(s string) []rune {
n, _ := strconv.ParseInt(s, 10, 64)
return []rune(fmt.Sprintf("%b", big.NewInt(n)))
}
// ParseHexStringToBinString converts hex string to binary string
func ParseHexStringToBinString(s string) (string, error) {
re := regexp.MustCompile("[^0-9a-fA-F]")
if re.FindStringIndex(s) != nil {
return "", errors.New("Input to ParseHexStringToBinString is not a hex string")
}
var bs string
for _, c := range s {
n, _ := strconv.ParseInt(string(c), 16, 32)
bs = fmt.Sprintf("%s%.4b", bs, n)
}
return bs, nil
}
// ParseHexStringToDecArrayString converts hex string to byte array
func ParseHexStringToDecArrayString(s string) (string, error) {
re := regexp.MustCompile("[^0-9a-fA-F]")
if re.FindStringIndex(s) != nil {
return "", errors.New("Input to ParseHexStringToBinString is not a hex string")
}
ds := ""
for i := 0; i < len(s); i += 2 {
v, err := strconv.ParseInt(s[i:i+2], 16, 16)
if err != nil {
return ds, nil
}
if i == 0 {
ds = fmt.Sprintf("%v", v)
} else {
ds = fmt.Sprintf("%s, %v", ds, v)
}
}
return ds, nil
}
// ParseRuneSliceTo6BinRuneSlice returns 6-bit encoded rune slice
func ParseRuneSliceTo6BinRuneSlice(r []rune) []rune {
var rs []rune
for i := 0; i < len(r); i++ {
rs = append(rs, ParseRuneTo6BinRuneSlice(r[i])...)
}
return rs
}
// ParseRuneTo6BinRuneSlice coverts rune into 6-bit encoding rune slice
func ParseRuneTo6BinRuneSlice(r rune) []rune {
if r >= 64 { // if the rune is after '@' in ASCII table
r -= 64
}
binString := fmt.Sprintf("%.6b", r)
return []rune(binString)
}
// Encode via Gob to file
func Save(path string, object interface{}) error {
file, err := os.Create(path)
if err == nil {
encoder := gob.NewEncoder(file)
encoder.Encode(object)
}
file.Close()
return err
}
// Decode Gob file
func Load(path string, object interface{}) error {
file, err := os.Open(path)
if err == nil {
decoder := gob.NewDecoder(file)
err = decoder.Decode(object)
}
file.Close()
return err
}