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package util
import ( "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)) }
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