io.netty.util.internal.BoundedInputStream Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2024 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.util.internal;

import org.jetbrains.annotations.NotNull;

import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

public final class BoundedInputStream extends FilterInputStream {

    private final int maxBytesRead;
    private int numRead;

    public BoundedInputStream(@NotNull InputStream in, int maxBytesRead) {
        super(in);
        this.maxBytesRead = ObjectUtil.checkPositive(maxBytesRead, "maxRead");
    }

    public BoundedInputStream(@NotNull InputStream in) {
        this(in, 8 * 1024);
    }

    @Override
    public int read() throws IOException {
        checkMaxBytesRead(1);
        try {
            int b = super.read();
            if (b <= 0) {
                // We couldn't read anything.
                numRead--;
            }
            return b;
        } catch (IOException e) {
            numRead--;
            throw e;
        }
    }

    @Override
    public int read(byte[] buf, int off, int len) throws IOException {
        // Calculate the maximum number of bytes that we should try to read.
        int num = Math.min(len, maxBytesRead - numRead + 1);
        checkMaxBytesRead(num);
        try {
            int b = super.read(buf, off, num);
            if (b == -1) {
                // We couldn't read anything.
                numRead -= num;
            } else if (b != num) {
                // Correct numRead based on the actual amount we were able to read.
                numRead -= num - b;
            }
            return b;
        } catch (IOException e) {
            numRead -= num;
            throw e;
        }
    }

    private void checkMaxBytesRead(int n) throws IOException {
        int sum = numRead + n;
        if (sum < 0 || sum > maxBytesRead) {
            numRead = maxBytesRead + 1;
            throw new IOException("Maximum number of bytes read: " + maxBytesRead);
        }
        numRead = sum;
    }
}