2013-03-21 15:49:14 +01:00
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/*
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* Copyright 2013 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.buffer;
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import io.netty.util.internal.PlatformDependent;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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/**
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* Read-only ByteBuf which wraps a read-only direct ByteBuffer and use unsafe for best performance.
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*/
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2013-03-23 10:54:43 +01:00
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final class ReadOnlyUnsafeDirectByteBuf extends ReadOnlyByteBufferBuf {
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2013-03-21 15:49:14 +01:00
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private static final boolean NATIVE_ORDER = ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN;
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private final long memoryAddress;
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public ReadOnlyUnsafeDirectByteBuf(ByteBufAllocator allocator, ByteBuffer buffer) {
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super(allocator, buffer);
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memoryAddress = PlatformDependent.directBufferAddress(buffer);
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}
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@Override
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protected byte _getByte(int index) {
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return PlatformDependent.getByte(addr(index));
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}
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@Override
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protected short _getShort(int index) {
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short v = PlatformDependent.getShort(addr(index));
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return NATIVE_ORDER? v : Short.reverseBytes(v);
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}
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@Override
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protected int _getUnsignedMedium(int index) {
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long addr = addr(index);
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return (PlatformDependent.getByte(addr) & 0xff) << 16 |
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(PlatformDependent.getByte(addr + 1) & 0xff) << 8 |
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PlatformDependent.getByte(addr + 2) & 0xff;
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}
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@Override
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protected int _getInt(int index) {
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int v = PlatformDependent.getInt(addr(index));
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return NATIVE_ORDER? v : Integer.reverseBytes(v);
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}
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@Override
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protected long _getLong(int index) {
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long v = PlatformDependent.getLong(addr(index));
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return NATIVE_ORDER? v : Long.reverseBytes(v);
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}
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@Override
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public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
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checkIndex(index, length);
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if (dst == null) {
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throw new NullPointerException("dst");
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}
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if (dstIndex < 0 || dstIndex > dst.capacity() - length) {
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throw new IndexOutOfBoundsException("dstIndex: " + dstIndex);
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}
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if (dst.hasMemoryAddress()) {
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PlatformDependent.copyMemory(addr(index), dst.memoryAddress() + dstIndex, length);
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} else if (dst.hasArray()) {
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PlatformDependent.copyMemory(addr(index), dst.array(), dst.arrayOffset() + dstIndex, length);
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} else {
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dst.setBytes(dstIndex, this, index, length);
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}
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return this;
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}
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@Override
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public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
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checkIndex(index, length);
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if (dst == null) {
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throw new NullPointerException("dst");
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}
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if (dstIndex < 0 || dstIndex > dst.length - length) {
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throw new IndexOutOfBoundsException(String.format(
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"dstIndex: %d, length: %d (expected: range(0, %d))", dstIndex, length, dst.length));
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}
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if (length != 0) {
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PlatformDependent.copyMemory(addr(index), dst, dstIndex, length);
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}
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return this;
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}
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@Override
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public ByteBuf getBytes(int index, ByteBuffer dst) {
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checkIndex(index);
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if (dst == null) {
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throw new NullPointerException("dst");
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}
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int bytesToCopy = Math.min(capacity() - index, dst.remaining());
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ByteBuffer tmpBuf = internalNioBuffer();
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tmpBuf.clear().position(index).limit(index + bytesToCopy);
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dst.put(tmpBuf);
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return this;
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}
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@Override
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public ByteBuf copy(int index, int length) {
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checkIndex(index, length);
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UnpooledUnsafeDirectByteBuf copy = (UnpooledUnsafeDirectByteBuf) alloc().directBuffer(length, maxCapacity());
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if (length != 0) {
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PlatformDependent.copyMemory(addr(index), copy.addr(0), length);
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copy.setIndex(0, length);
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}
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return copy;
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}
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private long addr(int index) {
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return memoryAddress + index;
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}
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}
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