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package com.helix.kit;

import java.io.UnsupportedEncodingException;

/**
 * Hex工具类，16进制转换算法2
 */
public final class HexUtil {

    public static final String CHARSET_NAME_UTF8 = "UTF-8";
    public static final char[] digital = "0123456789abcdef".toCharArray();

    public static String encodeHexStr(final byte[] bytes) {
        if (bytes == null) {
            return null;
        }
        char[] result = new char[bytes.length * 2];
        for (int i = 0; i < bytes.length; i++) {
            result[i * 2] = digital[(bytes[i] & 0xf0) >> 4];
            result[i * 2 + 1] = digital[bytes[i] & 0x0f];
        }
        return new String(result);
    }

    public static byte[] decodeHexStr(final String str) {
        if (str == null) {
            return null;
        }
        char[] charArray = str.toCharArray();
        if (charArray.length % 2 != 0) {
            throw new RuntimeException("hex str length must can mod 2, str:" + str);
        }
        byte[] bytes = new byte[charArray.length / 2];
        for (int i = 0; i < charArray.length; i++) {
            char c = charArray[i];
            int b;
            if (c >= '0' && c <= '9') {
                b = (c - '0') << 4;
            } else if (c >= 'A' && c <= 'F') {
                b = (c - 'A' + 10) << 4;
            } else {
                throw new RuntimeException("unsport hex str:" + str);
            }
            c = charArray[++i];
            if (c >= '0' && c <= '9') {
                b |= c - '0';
            } else if (c >= 'A' && c <= 'F') {
                b |= c - 'A' + 10;
            } else {
                throw new RuntimeException("unsport hex str:" + str);
            }
            bytes[i / 2] = (byte) b;
        }
        return bytes;
    }

    public static String toString(final byte[] bytes) {
        if (bytes == null) {
            return null;
        }
        try {
            return new String(bytes, CHARSET_NAME_UTF8);
        } catch (final UnsupportedEncodingException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    public static String toString(final byte[] bytes, String charset) {
        if (bytes == null) {
            return null;
        }
        try {
            return new String(bytes, charset);
        } catch (final UnsupportedEncodingException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    public static byte[] toBytes(final String str) {
        if (str == null) {
            return null;
        }
        try {
            return str.getBytes(CHARSET_NAME_UTF8);
        } catch (final UnsupportedEncodingException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    private HexUtil() {
    }
}