golang实现整型和字节数组之间的转换

阳光穿透心脏的1/2处 2022-05-22 09:04 186阅读 0赞

//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")
    }