//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!")
 }
}

//整形转换成字节
func IntToBytes(n int,b byte) ([]byte,error) {
 switch b {
 case 1:
 tmp := int8(n)
 bytesBuffer := bytes.NewBuffer([]byte{})
 binary.Write(bytesBuffer, binary.BigEndian, tmp)
 return bytesBuffer.Bytes(),nil
 case 2:
 tmp := int16(n)
 bytesBuffer := bytes.NewBuffer([]byte{})
 binary.Write(bytesBuffer, binary.BigEndian, tmp)
 return bytesBuffer.Bytes(),nil
 case 3,4:
 tmp := int32(n)
 bytesBuffer := bytes.NewBuffer([]byte{})
 binary.Write(bytesBuffer, binary.BigEndian, tmp)
 return bytesBuffer.Bytes(),nil
 }
 return nil,fmt.Errorf("IntToBytes b param is invaild")
}

func IntToBytes(n int)[]byte{
 data:=int64(n)//数据类型转换
 bytebuffer:=bytes.NewBuffer([]byte{})//字节集合
 binary.Write(bytebuffer,binary.BigEndian,data)//按照二进制写入字节
 return bytebuffer.Bytes()//返回字节结合
}

func BytesToInt(bs []byte)int{
 bytebuffer:=bytes.NewBuffer(bs) //根据二进制写入二进制结合
 var data int64
 binary.Read(bytebuffer,binary.BigEndian,data) //解码
 return int(data)
}