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package com.github.andyshao.lang;

import java.util.Objects;

/**
 * 
 * Descript:

 * Copyright: Copyright(c) Aug 7, 2014

 * Encoding:UNIX UTF-8
 * 
 * @author Andy.Shao
 *
 */
public class ConvertStr2Byte implements Convert {

    static byte charToByte(char c) {
        return (byte) "0123456789ABCDEF".indexOf(c);
    }

    /**
     * hex string to bytes
     * @param hexString hex string
     * @return {@link ArrayType#BYTE_ARRAY}
     */
    public static byte[] hexStringTobytes(String hexString) {
        if (Objects.isNull(hexString) || hexString.isEmpty()) return null;

        hexString = hexString.toUpperCase();
        int length = hexString.length() / 2;
        char[] hexChars = hexString.toCharArray();
        byte[] d = new byte[length];
        for (int i = 0 ; i < length ; i++) {
            int pos = i * 2;
            d[i] = (byte) (char) (ConvertStr2Byte.charToByte(hexChars[pos]) << 4 | ConvertStr2Byte.charToByte(hexChars[pos + 1]));
        }

        return d;
    }

    /**
     * hex string to bytes
     * @param hexString hex string
     * @return {@link ArrayType#BYTE_ARRAY}
     */
    public static Byte[] hexStringToBytes(String hexString) {
        if (Objects.isNull(hexString) || hexString.isEmpty()) return null;

        hexString = hexString.toUpperCase();
        int length = hexString.length() / 2;
        char[] hexChars = hexString.toCharArray();
        Byte[] d = new Byte[length];
        for (int i = 0 ; i < length ; i++) {
            int pos = i * 2;
            d[i] = (byte) (char) (ConvertStr2Byte.charToByte(hexChars[pos]) << 4 | ConvertStr2Byte.charToByte(hexChars[pos + 1]));
        }

        return d;
    }

    @Override
    public Byte[] convert(String in) {
        return ConvertStr2Byte.hexStringToBytes(in);
    }
}