1个unsigned short 与 2个 unsigned byte 互转

2019年11月10日 119次阅读

用例

通过一个无符号短整型代表两个无符号字节（Major Version、Minor Version）

代码实现

 /** * get an unsigned short (2 bytes) based on the high (1 byte) and low (1 byte) * * @param high * @param low * @return unsigned short * @throws NumberFormatException */
    public static int getVersion(short high, short low) throws NumberFormatException {
        short MAX_VALUE = 0xFF;
        int MIN_VALUE = 0x01;
        if (high < MIN_VALUE || high > MAX_VALUE || low < MIN_VALUE || low > MAX_VALUE) {
            throw new NumberFormatException("high value " + high + " or low value " + low + "greater than " + MAX_VALUE +
                    " or high value " + high + " or low value " + low + "less than " + MIN_VALUE);
        }
        return (high << 8) + low;//unsigned short
    }

    /** * get high (1 byte) and low (1 byte) values based on an unsigned short (2 bytes) * * @param i unsigned short * @return {high,low} * @throws NumberFormatException */
    public static short[] getVersion(int i) throws NumberFormatException {
        int MAX_VALUE = 0xFFFF;
        int MIN_VALUE = 0x01;
        if (i < MIN_VALUE || i > MAX_VALUE) {
            throw new NumberFormatException("value " + i + " greater than " + MAX_VALUE + " or less than " + MIN_VALUE);
        }
        short high = (short) (i >> 8);//unsigned byte
        short low = (short) (i & 0x00ff);//unsigned byte
        return new short[]{high, low};
    }
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