UnsafeByteBufUtil.java — netty Source File

Source Code

/*
 * Copyright 2015 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.buffer;

import io.netty.util.internal.PlatformDependent;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.ReadOnlyBufferException;

import static io.netty.util.internal.MathUtil.isOutOfBounds;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import static io.netty.util.internal.PlatformDependent.BIG_ENDIAN_NATIVE_ORDER;

/**
 * All operations get and set as {@link ByteOrder#BIG_ENDIAN}.
 */
final class UnsafeByteBufUtil {
    private static final boolean UNALIGNED = PlatformDependent.isUnaligned();
    private static final byte ZERO = 0;
    private static final int MAX_HAND_ROLLED_SET_ZERO_BYTES = 64;

    static byte getByte(long address) {
        return PlatformDependent.getByte(address);
    }

    static short getShort(long address) {
        if (UNALIGNED) {
            short v = PlatformDependent.getShort(address);
            return BIG_ENDIAN_NATIVE_ORDER ? v : Short.reverseBytes(v);
        }
        return (short) (PlatformDependent.getByte(address) << 8 | PlatformDependent.getByte(address + 1) & 0xff);
    }

    static short getShortLE(long address) {
        if (UNALIGNED) {
            short v = PlatformDependent.getShort(address);
            return BIG_ENDIAN_NATIVE_ORDER ? Short.reverseBytes(v) : v;
        }
        return (short) (PlatformDependent.getByte(address) & 0xff | PlatformDependent.getByte(address + 1) << 8);
    }

    static int getUnsignedMedium(long address) {
        if (UNALIGNED) {
// ... (643 more lines)