/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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
 *
 *   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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */
package org.apache.hc.core5.websocket;

import java.nio.ByteBuffer;

import org.apache.hc.core5.annotation.Internal;

/**
 * Shared low-level buffer operations for WebSocket frame and message handling.
 *
 * @since 5.7
 */
@Internal
public final class WebSocketBufferOps {

    private WebSocketBufferOps() {
    }

    public static byte[] toBytes(final ByteBuffer buf) {
        final ByteBuffer dup = buf.duplicate();
        final byte[] out = new byte[dup.remaining()];
        dup.get(out);
        return out;
    }

    public static ByteBuffer ensureCapacity(final ByteBuffer buf, final int needed) {
        if (buf.remaining() >= needed) {
            return buf;
        }
        final int require = buf.position() + needed;
        final int growth = Math.max(buf.capacity() >> 2, 4096);
        final int newCap = Math.max(buf.capacity() + growth, require);
        final ByteBuffer bigger = ByteBuffer.allocate(newCap);
        buf.flip();
        bigger.put(buf);
        return bigger;
    }

}
