io.netty.buffer.ReadOnlyUnsafeDirectByteBuf Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS 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 2013 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:
 *
 *   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 io.netty.buffer;


import io.netty.util.internal.PlatformDependent;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;



/**
 * Read-only ByteBuf which wraps a read-only direct ByteBuffer and use unsafe for best performance.
 */
final class ReadOnlyUnsafeDirectByteBuf extends ReadOnlyByteBufferBuf {
    private static final boolean NATIVE_ORDER = ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN;
    private final long memoryAddress;

    ReadOnlyUnsafeDirectByteBuf(ByteBufAllocator allocator, ByteBuffer buffer) {
        super(allocator, buffer);
        memoryAddress = PlatformDependent.directBufferAddress(buffer);
    }

    @Override
    protected byte _getByte(int index) {
        return PlatformDependent.getByte(addr(index));
    }

    @Override
    protected short _getShort(int index) {
        short v = PlatformDependent.getShort(addr(index));
        return NATIVE_ORDER? v : Short.reverseBytes(v);
    }

    @Override
    protected int _getUnsignedMedium(int index) {
        long addr = addr(index);
        return (PlatformDependent.getByte(addr) & 0xff) << 16 |
                (PlatformDependent.getByte(addr + 1) & 0xff) << 8 |
                PlatformDependent.getByte(addr + 2) & 0xff;
    }

    @Override
    protected int _getInt(int index) {
        int v = PlatformDependent.getInt(addr(index));
        return NATIVE_ORDER? v : Integer.reverseBytes(v);
    }

    @Override
    protected long _getLong(int index) {
        long v = PlatformDependent.getLong(addr(index));
        return NATIVE_ORDER? v : Long.reverseBytes(v);
    }

    @Override
    public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
        checkIndex(index, length);
        if (dst == null) {
            throw new NullPointerException("dst");
        }
        if (dstIndex < 0 || dstIndex > dst.capacity() - length) {
            throw new IndexOutOfBoundsException("dstIndex: " + dstIndex);
        }

        if (dst.hasMemoryAddress()) {
            PlatformDependent.copyMemory(addr(index), dst.memoryAddress() + dstIndex, length);
        } else if (dst.hasArray()) {
            PlatformDependent.copyMemory(addr(index), dst.array(), dst.arrayOffset() + dstIndex, length);
        } else {
            dst.setBytes(dstIndex, this, index, length);
        }
        return this;
    }

    @Override
    public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
        checkIndex(index, length);
        if (dst == null) {
            throw new NullPointerException("dst");
        }
        if (dstIndex < 0 || dstIndex > dst.length - length) {
            throw new IndexOutOfBoundsException(String.format(
                    "dstIndex: %d, length: %d (expected: range(0, %d))", dstIndex, length, dst.length));
        }

        if (length != 0) {
            PlatformDependent.copyMemory(addr(index), dst, dstIndex, length);
        }
        return this;
    }

    @Override
    public ByteBuf getBytes(int index, ByteBuffer dst) {
        checkIndex(index);
        if (dst == null) {
            throw new NullPointerException("dst");
        }

        int bytesToCopy = Math.min(capacity() - index, dst.remaining());
        ByteBuffer tmpBuf = internalNioBuffer();
        tmpBuf.clear().position(index).limit(index + bytesToCopy);
        dst.put(tmpBuf);
        return this;
    }

    @Override
    public ByteBuf copy(int index, int length) {
        checkIndex(index, length);
        ByteBuf copy = alloc().directBuffer(length, maxCapacity());
        if (length != 0) {
            if (copy.hasMemoryAddress()) {
                PlatformDependent.copyMemory(addr(index), copy.memoryAddress(), length);
                copy.setIndex(0, length);
            } else {
                copy.writeBytes(this, index, length);
            }
        }
        return copy;
    }

    private long addr(int index) {
        return memoryAddress + index;
    }
}