package cn.licoy.encryptbody.util;

/**
 * <p>二进制转换工具类</p>
 * @author licoy.cn
 * @version 2018/9/5
 */
public class Hex2Util {

    /**
     * 二进位组转十六进制字符串
     * @param buf 二进位组
     * @return 十六进制字符串
     */
    public static String parseByte2HexStr(byte buf[]) {
        StringBuilder sb = new StringBuilder();
        for (byte b : buf) {
            String hex = Integer.toHexString(b & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

    /**
     * 十六进制字符串转二进位组
     * @param hexStr 十六进制字符串
     * @return 二进位组
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1) return null;
        byte[] result = new byte[hexStr.length() / 2];

        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }

}
