com.epam.deltix.util.io.BufferedInputStreamEx Maven / Gradle / Ivy

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/*
 * Copyright 2021 EPAM Systems, Inc
 *
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership. Licensed 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
 *
 *   http://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 com.epam.deltix.util.io;

import com.epam.deltix.util.lang.Bits;

import java.io.BufferedInputStream;
import java.io.InputStream;

/**
 * {@link BufferedInputStream} populates it's buffer with initial data from provided buffer.
 */
public class BufferedInputStreamEx extends BufferedInputStream {
    public BufferedInputStreamEx(InputStream in, byte[] buf, int size) {
        super(in, Math.max(Bits.nextPowerOfTwo(size), 8192));

        assert size <= this.buf.length;

        // Copy provided buffer to internal buffer
        System.arraycopy(buf, 0, this.buf, 0, size);
        this.count = size;
    }
}