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package util
import (
"bytes"
"crypto/md5"
"crypto/rand"
"encoding/base64"
"fmt"
"io"
"math"
"strconv"
"strings"
"unicode"
)
// BytesToHumanReadable returns the converted human readable representation of the bytes.
func BytesToHumanReadable(b uint64) string {
const unit = 1024
if b < unit {
return fmt.Sprintf("%d B", b)
}
div, exp := uint64(unit), 0
for n := b / unit; n >= unit; n /= unit {
div *= unit
exp++
}
return fmt.Sprintf("%.2f %ciB", float64(b)/float64(div), "KMGTPE"[exp])
}
// big endian
func BytesToUint64(b []byte) (v uint64) {
length := uint(len(b))
for i := uint(0); i < length-1; i++ {
v += uint64(b[i])
v <<= 8
}
v += uint64(b[length-1])
return
}
func BytesToUint32(b []byte) (v uint32) {
length := uint(len(b))
for i := uint(0); i < length-1; i++ {
v += uint32(b[i])
v <<= 8
}
v += uint32(b[length-1])
return
}
func BytesToUint16(b []byte) (v uint16) {
v += uint16(b[0])
v <<= 8
v += uint16(b[1])
return
}
func Uint64toBytes(b []byte, v uint64) {
for i := uint(0); i < 8; i++ {
b[7-i] = byte(v >> (i * 8))
}
}
func Uint32toBytes(b []byte, v uint32) {
for i := uint(0); i < 4; i++ {
b[3-i] = byte(v >> (i * 8))
}
}
func Uint16toBytes(b []byte, v uint16) {
b[0] = byte(v >> 8)
b[1] = byte(v)
}
func Uint8toBytes(b []byte, v uint8) {
b[0] = byte(v)
}
// returns a 64 bit big int
func HashStringToLong(dir string) (v int64) {
h := md5.New()
io.WriteString(h, dir)
b := h.Sum(nil)
v += int64(b[0])
v <<= 8
v += int64(b[1])
v <<= 8
v += int64(b[2])
v <<= 8
v += int64(b[3])
v <<= 8
v += int64(b[4])
v <<= 8
v += int64(b[5])
v <<= 8
v += int64(b[6])
v <<= 8
v += int64(b[7])
return
}
func HashToInt32(data []byte) (v int32) {
h := md5.New()
h.Write(data)
b := h.Sum(nil)
v += int32(b[0])
v <<= 8
v += int32(b[1])
v <<= 8
v += int32(b[2])
v <<= 8
v += int32(b[3])
return
}
func Base64Encode(data []byte) string {
return base64.StdEncoding.EncodeToString(data)
}
func Base64Md5(data []byte) string {
return Base64Encode(Md5(data))
}
func Md5(data []byte) []byte {
hash := md5.New()
hash.Write(data)
return hash.Sum(nil)
}
func Md5String(data []byte) string {
return fmt.Sprintf("%x", Md5(data))
}
func Base64Md5ToBytes(contentMd5 string) []byte {
data, err := base64.StdEncoding.DecodeString(contentMd5)
if err != nil {
return nil
}
return data
}
func RandomInt32() int32 {
buf := make([]byte, 4)
rand.Read(buf)
return int32(BytesToUint32(buf))
}
func RandomUint64() int32 {
buf := make([]byte, 8)
rand.Read(buf)
return int32(BytesToUint64(buf))
}
func RandomBytes(byteCount int) []byte {
buf := make([]byte, byteCount)
rand.Read(buf)
return buf
}
type BytesReader struct {
Bytes []byte
*bytes.Reader
}
func NewBytesReader(b []byte) *BytesReader {
return &BytesReader{
Bytes: b,
Reader: bytes.NewReader(b),
}
}
// EmptyTo returns to if s is empty.
func EmptyTo(s, to string) string {
if s == "" {
return to
}
return s
}
// IfElse works like b ? this : that.
func IfElse(b bool, this, that string) string {
if b {
return this
}
return that
}
// ParseBytes parses a string representation of bytes into the number
// of bytes it represents.
//
// See Also: Bytes, IBytes.
//
// ParseBytes("42MB") -> 42000000, nil
// ParseBytes("42 MB") -> 42000000, nil
// ParseBytes("42 mib") -> 44040192, nil
func ParseBytes(s string) (uint64, error) {
lastDigit := 0
hasComma := false
for _, r := range s {
if !(unicode.IsDigit(r) || r == '.' || r == ',') {
break
}
if r == ',' {
hasComma = true
}
lastDigit++
}
num := s[:lastDigit]
if hasComma {
num = strings.Replace(num, ",", "", -1)
}
f, err := strconv.ParseFloat(num, 64)
if err != nil {
return 0, err
}
extra := strings.ToLower(strings.TrimSpace(s[lastDigit:]))
if m, ok := bytesSizeTable[extra]; ok {
f *= float64(m)
if f >= math.MaxUint64 {
return 0, fmt.Errorf("too large: %v", s)
}
return uint64(f), nil
}
return 0, fmt.Errorf("unhandled size name: %v", extra)
}
var bytesSizeTable = map[string]uint64{
"b": Byte, "kib": KiByte, "kb": KByte, "mib": MiByte, "mb": MByte, "gib": GiByte, "gb": GByte,
"tib": TiByte, "tb": TByte, "pib": PiByte, "pb": PByte, "eib": EiByte, "eb": EByte,
// Without suffix
"": Byte, "ki": KiByte, "k": KByte, "mi": MiByte, "m": MByte, "gi": GiByte, "g": GByte,
"ti": TiByte, "t": TByte, "pi": PiByte, "p": PByte, "ei": EiByte, "e": EByte,
}
// IEC Sizes.
// kibis of bits
const (
Byte = 1 << (iota * 10)
KiByte
MiByte
GiByte
TiByte
PiByte
EiByte
)
// SI Sizes.
const (
IByte = 1
KByte = IByte * 1000
MByte = KByte * 1000
GByte = MByte * 1000
TByte = GByte * 1000
PByte = TByte * 1000
EByte = PByte * 1000
)
|
