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|
package util
import (
"bytes"
"crypto/md5"
"crypto/rand"
"encoding/base64"
"fmt"
"io"
)
// 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 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),
}
}
|
