app/src/main/java/me/zhanghai/android/douya/util/IoUtils.java

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/*
 * Copyright (c) 2015 Zhang Hai <Dreaming.in.Code.ZH@Gmail.com>
 * All Rights Reserved.
 */

package me.zhanghai.android.douya.util;

import android.util.Base64;

import org.json.JSONArray;
import org.json.JSONException;

import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Collection;

public class IoUtils {

    private static final int BUFFER_SIZE = 4 * 1024;

    private static final char[] HEX_DIGITS_LOWER_CASED = "0123456789abcdef".toCharArray();
    private static final char[] HEX_DIGITS_UPPER_CASED = "0123456789ABCDEF".toCharArray();

    private static final String STRING_DELIMITER = "|";
    private static final String STRING_DELIMITER_REGEX = "\\|";

    private IoUtils() {}

    public static void close(Closeable closeable) {
        try {
            closeable.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static String inputStreamToString(InputStream inputStream, String charsetName)
            throws IOException {
        StringBuilder builder = new StringBuilder();
        InputStreamReader reader = new InputStreamReader(inputStream, charsetName);
        char[] buffer = new char[BUFFER_SIZE];
        int length;
        while ((length = reader.read(buffer)) != -1) {
            builder.append(buffer, 0, length);
        }
        return builder.toString();
    }

    public static String byteArrayToBase64(byte[] byteArray) {
        // We are using Base64 in Json so we don't want newlines here.
        return Base64.encodeToString(byteArray, Base64.NO_WRAP);
    }

    public static byte[] base64ToByteArray(String base64) {
        return Base64.decode(base64, Base64.DEFAULT);
    }

    private static String byteArrayToHexString(byte[] bytes, char[] digits) {