/*
 * Hello Minecraft! Launcher.
 * Copyright (C) 2018  huangyuhui <huanghongxun2008@126.com>
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see {http://www.gnu.org/licenses/}.
 */
package org.jackhuang.hmcl.util;

import java.io.*;
import java.nio.charset.Charset;

/**
 *
 * @author huang
 */
public final class IOUtils {

    private IOUtils() {
    }

    public static final int DEFAULT_BUFFER_SIZE = 8 * 1024;

    public static byte[] readFullyWithoutClosing(InputStream stream) throws IOException {
        ByteArrayOutputStream result = new ByteArrayOutputStream();
        copyTo(stream, result);
        return result.toByteArray();
    }

    public static ByteArrayOutputStream readFully(InputStream stream) throws IOException {
        try (InputStream is = stream) {
            ByteArrayOutputStream result = new ByteArrayOutputStream();
            copyTo(is, result);
            return result;
        }
    }

    public static byte[] readFullyAsByteArray(InputStream stream) throws IOException {
        return readFully(stream).toByteArray();
    }

    public static String readFullyAsString(InputStream stream) throws IOException {
        return readFully(stream).toString();
    }

    public static String readFullyAsString(InputStream stream, Charset charset) throws IOException {
        return readFully(stream).toString(charset.name());
    }

    public static void copyTo(InputStream src, OutputStream dest) throws IOException {
        copyTo(src, dest, new byte[DEFAULT_BUFFER_SIZE]);
    }

    public static void copyTo(InputStream src, OutputStream dest, byte[] buf) throws IOException {
        while (true) {
            int len = src.read(buf);
            if (len == -1)
                break;
            dest.write(buf, 0, len);
        }
    }
}
