golang []byte 和 int 互转

//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 uint8err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)return int(tmp), errcase 2:var tmp uint16err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)return int(tmp), errcase 4:var tmp uint32err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)return int(tmp), errdefault: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 int8err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)return int(tmp), errcase 2:var tmp int16err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)return int(tmp), errcase 4:var tmp int32err := binary.Read(bytesBuffer, binary.BigEndian, &tmp)return int(tmp), errdefault: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(),nilcase 2:tmp := int16(n)bytesBuffer := bytes.NewBuffer([]byte{})binary.Write(bytesBuffer, binary.BigEndian, &tmp)return bytesBuffer.Bytes(),nilcase 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")
}

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