package com.safeluck.aykj.decoder;

import com.safeluck.aykj.utils.BytesUtils;

import java.io.UnsupportedEncodingException;

/**
 * Created by zhouwei on 2016/12/3.
 */

public class GBKStringDecoder extends BaseDecoder<String> {

    public String stripEnd(String str, String stripChars) {
        int end;
        if(str != null && (end = str.length()) != 0) {
            if(stripChars == null) {
                while(end != 0 && Character.isWhitespace(str.charAt(end - 1))) {
                    --end;
                }
            } else {
                if(stripChars.length() == 0) {
                    return str;
                }

                while(end != 0 && stripChars.indexOf(str.charAt(end - 1)) != -1) {
                    --end;
                }
            }

            return str.substring(0, end);
        } else {
            return str;
        }
    }


    @Override
    public String decode(String str) {

        if(str==null)
            return null;
        byte[] bytes = BytesUtils.hexStringToBytes(str);

        try {

            String ret = new String(bytes,"gbk").trim();
            return ret;// this.stripEnd(ret,"\0");
        } catch (UnsupportedEncodingException e) {
            return null;
        }
    }

    @Override
    public String encode(String str) {
        try {
            if(str==null)
                return null;
            return BytesUtils.bytesToHexString(str.getBytes("gbk"));
        } catch (UnsupportedEncodingException e) {
            return null;
        }
    }
}