001/*
002 *  Copyright (c) 2023-2026, Agents-Flex (fuhai999@gmail.com).
003 *  <p>
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *  <p>
008 *  http://www.apache.org/licenses/LICENSE-2.0
009 *  <p>
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package com.agentsflex.core.file2text.util;
017
018import java.io.ByteArrayOutputStream;
019import java.io.IOException;
020import java.io.InputStream;
021import java.io.OutputStream;
022
023public class IOUtils {
024    private static final int BUFFER_SIZE = 8192;
025
026    public static byte[] toByteArray(InputStream is, long maxSize) {
027        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
028        copyStream(is, buffer, maxSize);
029        return buffer.toByteArray();
030    }
031
032    public static void copyStream(InputStream is, OutputStream os, long maxSize) {
033        byte[] buffer = new byte[BUFFER_SIZE];
034        int bytesRead;
035        long total = 0;
036        try {
037            while ((bytesRead = is.read(buffer)) != -1) {
038                if (total + bytesRead > maxSize) {
039                    throw new RuntimeException("Stream too large: limit is " + maxSize + " bytes");
040                }
041                os.write(buffer, 0, bytesRead);
042                total += bytesRead;
043            }
044        } catch (IOException e) {
045            throw new RuntimeException(e);
046        }
047    }
048}