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BytesAndInt.go
63 lines (59 loc) · 1.37 KB
/
BytesAndInt.go
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package comtools
import (
"bytes"
"encoding/binary"
"fmt"
)
//isSymbol表示有无符号
func BytesToInt(b []byte, isSymbol bool) (int, error) {
if isSymbol {
return bytesToIntS(b)
}
return bytesToIntU(b)
}
//字节数(大端)组转成int(无符号的)
func bytesToIntU(b []byte) (int, error) {
if len(b) == 3 {
b = append([]byte{0}, b...)
}
bytesBuffer := bytes.NewBuffer(b)
switch len(b) {
case 1:
var tmp uint8
err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
return int(tmp), err
case 2:
var tmp uint16
err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
return int(tmp), err
case 4:
var tmp uint32
err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
return int(tmp), err
default:
return 0, fmt.Errorf("%s", "BytesToInt bytes lenth is invaild!")
}
}
//字节数(大端)组转成int(有符号)
func bytesToIntS(b []byte) (int, error) {
if len(b) == 3 {
b = append([]byte{0}, b...)
}
bytesBuffer := bytes.NewBuffer(b)
switch len(b) {
case 1:
var tmp int8
err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
return int(tmp), err
case 2:
var tmp int16
err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
return int(tmp), err
case 4:
var tmp int32
err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)
return int(tmp), err
default:
return 0, fmt.Errorf("%s", "BytesToInt bytes lenth is invaild!")
}
}