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/*
* Copyright 2012 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.handler.codec;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.ByteBufProcessor;
import io.netty.buffer.SwappedByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.util.Signal;
import io.netty.util.internal.StringUtil;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
import java.nio.charset.Charset;
/**
* Special {@link ByteBuf} implementation which is used by the {@link ReplayingDecoder}
*/
final class ReplayingDecoderByteBuf extends ByteBuf {
private static final Signal REPLAY = ReplayingDecoder.REPLAY;
private ByteBuf buffer;
private boolean terminated;
private SwappedByteBuf swapped;
static final ReplayingDecoderByteBuf EMPTY_BUFFER = new ReplayingDecoderByteBuf(Unpooled.EMPTY_BUFFER);
static {
EMPTY_BUFFER.terminate();
}
ReplayingDecoderByteBuf() { }
ReplayingDecoderByteBuf(ByteBuf buffer) {
setCumulation(buffer);
}
void setCumulation(ByteBuf buffer) {
this.buffer = buffer;
}
void terminate() {
terminated = true;
}
@Override
public int capacity() {
if (terminated) {
return buffer.capacity();
} else {
return Integer.MAX_VALUE;
}
}
@Override
public ByteBuf capacity(int newCapacity) {
reject();
return this;
}
@Override
public int maxCapacity() {
return capacity();
}
@Override
public ByteBufAllocator alloc() {
return buffer.alloc();
}
@Override
public boolean isDirect() {
return buffer.isDirect();
}
@Override
public boolean hasArray() {
return false;
}
@Override
public byte[] array() {
throw new UnsupportedOperationException();
}
@Override
public int arrayOffset() {
throw new UnsupportedOperationException();
}
@Override
public boolean hasMemoryAddress() {
return false;
}
@Override
public long memoryAddress() {
throw new UnsupportedOperationException();
}
@Override
public ByteBuf clear() {
reject();
return this;
}
@Override
public boolean equals(Object obj) {
return this == obj;
}
@Override
public int compareTo(ByteBuf buffer) {
reject();
return 0;
}
@Override
public ByteBuf copy() {
reject();
return this;
}
@Override
public ByteBuf copy(int index, int length) {
checkIndex(index, length);
return buffer.copy(index, length);
}
@Override
public ByteBuf discardReadBytes() {
reject();
return this;
}
@Override
public ByteBuf ensureWritable(int writableBytes) {
reject();
return this;
}
@Override
public int ensureWritable(int minWritableBytes, boolean force) {
reject();
return 0;
}
@Override
public ByteBuf duplicate() {
reject();
return this;
}
@Override
public boolean getBoolean(int index) {
checkIndex(index, 1);
return buffer.getBoolean(index);
}
@Override
public byte getByte(int index) {
checkIndex(index, 1);
return buffer.getByte(index);
}
@Override
public short getUnsignedByte(int index) {
checkIndex(index, 1);
return buffer.getUnsignedByte(index);
}
@Override
public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
checkIndex(index, length);
buffer.getBytes(index, dst, dstIndex, length);
return this;
}
@Override
public ByteBuf getBytes(int index, byte[] dst) {
checkIndex(index, dst.length);
buffer.getBytes(index, dst);
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuffer dst) {
reject();
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
checkIndex(index, length);
buffer.getBytes(index, dst, dstIndex, length);
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int length) {
reject();
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst) {
reject();
return this;
}
@Override
public int getBytes(int index, GatheringByteChannel out, int length) {
reject();
return 0;
}
@Override
public ByteBuf getBytes(int index, OutputStream out, int length) {
reject();
return this;
}
@Override
public int getInt(int index) {
checkIndex(index, 4);
return buffer.getInt(index);
}
@Override
public long getUnsignedInt(int index) {
checkIndex(index, 4);
return buffer.getUnsignedInt(index);
}
@Override
public long getLong(int index) {
checkIndex(index, 8);
return buffer.getLong(index);
}
@Override
public int getMedium(int index) {
checkIndex(index, 3);
return buffer.getMedium(index);
}
@Override
public int getUnsignedMedium(int index) {
checkIndex(index, 3);
return buffer.getUnsignedMedium(index);
}
@Override
public short getShort(int index) {
checkIndex(index, 2);
return buffer.getShort(index);
}
@Override
public int getUnsignedShort(int index) {
checkIndex(index, 2);
return buffer.getUnsignedShort(index);
}
@Override
public char getChar(int index) {
checkIndex(index, 2);
return buffer.getChar(index);
}
@Override
public float getFloat(int index) {
checkIndex(index, 4);
return buffer.getFloat(index);
}
@Override
public double getDouble(int index) {
checkIndex(index, 8);
return buffer.getDouble(index);
}
@Override
public int hashCode() {
reject();
return 0;
}
@Override
public int indexOf(int fromIndex, int toIndex, byte value) {
if (fromIndex == toIndex) {
return -1;
}
if (Math.max(fromIndex, toIndex) > buffer.writerIndex()) {
throw REPLAY;
}
return buffer.indexOf(fromIndex, toIndex, value);
}
@Override
public int bytesBefore(byte value) {
int bytes = buffer.bytesBefore(value);
if (bytes < 0) {
throw REPLAY;
}
return bytes;
}
@Override
public int bytesBefore(int length, byte value) {
final int readerIndex = buffer.readerIndex();
return bytesBefore(readerIndex, buffer.writerIndex() - readerIndex, value);
}
@Override
public int bytesBefore(int index, int length, byte value) {
final int writerIndex = buffer.writerIndex();
if (index >= writerIndex) {
throw REPLAY;
}
if (index <= writerIndex - length) {
return buffer.bytesBefore(index, length, value);
}
int res = buffer.bytesBefore(index, writerIndex - index, value);
if (res < 0) {
throw REPLAY;
} else {
return res;
}
}
@Override
public int forEachByte(ByteBufProcessor processor) {
int ret = buffer.forEachByte(processor);
if (ret < 0) {
throw REPLAY;
} else {
return ret;
}
}
@Override
public int forEachByte(int index, int length, ByteBufProcessor processor) {
final int writerIndex = buffer.writerIndex();
if (index >= writerIndex) {
throw REPLAY;
}
if (index <= writerIndex - length) {
return buffer.forEachByte(index, length, processor);
}
int ret = buffer.forEachByte(index, writerIndex - index, processor);
if (ret < 0) {
throw REPLAY;
} else {
return ret;
}
}
@Override
public int forEachByteDesc(ByteBufProcessor processor) {
if (terminated) {
return buffer.forEachByteDesc(processor);
} else {
reject();
return 0;
}
}
@Override
public int forEachByteDesc(int index, int length, ByteBufProcessor processor) {
if (index + length > buffer.writerIndex()) {
throw REPLAY;
}
return buffer.forEachByteDesc(index, length, processor);
}
@Override
public ByteBuf markReaderIndex() {
buffer.markReaderIndex();
return this;
}
@Override
public ByteBuf markWriterIndex() {
reject();
return this;
}
@Override
public ByteOrder order() {
return buffer.order();
}
@Override
public ByteBuf order(ByteOrder endianness) {
if (endianness == null) {
throw new NullPointerException("endianness");
}
if (endianness == order()) {
return this;
}
SwappedByteBuf swapped = this.swapped;
if (swapped == null) {
this.swapped = swapped = new SwappedByteBuf(this);
}
return swapped;
}
@Override
public boolean isReadable() {
return terminated? buffer.isReadable() : true;
}
@Override
public boolean isReadable(int size) {
return terminated? buffer.isReadable(size) : true;
}
@Override
public int readableBytes() {
if (terminated) {
return buffer.readableBytes();
} else {
return Integer.MAX_VALUE - buffer.readerIndex();
}
}
@Override
public boolean readBoolean() {
checkReadableBytes(1);
return buffer.readBoolean();
}
@Override
public byte readByte() {
checkReadableBytes(1);
return buffer.readByte();
}
@Override
public short readUnsignedByte() {
checkReadableBytes(1);
return buffer.readUnsignedByte();
}
@Override
public ByteBuf readBytes(byte[] dst, int dstIndex, int length) {
checkReadableBytes(length);
buffer.readBytes(dst, dstIndex, length);
return this;
}
@Override
public ByteBuf readBytes(byte[] dst) {
checkReadableBytes(dst.length);
buffer.readBytes(dst);
return this;
}
@Override
public ByteBuf readBytes(ByteBuffer dst) {
reject();
return this;
}
@Override
public ByteBuf readBytes(ByteBuf dst, int dstIndex, int length) {
checkReadableBytes(length);
buffer.readBytes(dst, dstIndex, length);
return this;
}
@Override
public ByteBuf readBytes(ByteBuf dst, int length) {
reject();
return this;
}
@Override
public ByteBuf readBytes(ByteBuf dst) {
checkReadableBytes(dst.writableBytes());
buffer.readBytes(dst);
return this;
}
@Override
public int readBytes(GatheringByteChannel out, int length) {
reject();
return 0;
}
@Override
public ByteBuf readBytes(int length) {
checkReadableBytes(length);
return buffer.readBytes(length);
}
@Override
public ByteBuf readSlice(int length) {
checkReadableBytes(length);
return buffer.readSlice(length);
}
@Override
public ByteBuf readBytes(OutputStream out, int length) {
reject();
return this;
}
@Override
public int readerIndex() {
return buffer.readerIndex();
}
@Override
public ByteBuf readerIndex(int readerIndex) {
buffer.readerIndex(readerIndex);
return this;
}
@Override
public int readInt() {
checkReadableBytes(4);
return buffer.readInt();
}
@Override
public long readUnsignedInt() {
checkReadableBytes(4);
return buffer.readUnsignedInt();
}
@Override
public long readLong() {
checkReadableBytes(8);
return buffer.readLong();
}
@Override
public int readMedium() {
checkReadableBytes(3);
return buffer.readMedium();
}
@Override
public int readUnsignedMedium() {
checkReadableBytes(3);
return buffer.readUnsignedMedium();
}
@Override
public short readShort() {
checkReadableBytes(2);
return buffer.readShort();
}
@Override
public int readUnsignedShort() {
checkReadableBytes(2);
return buffer.readUnsignedShort();
}
@Override
public char readChar() {
checkReadableBytes(2);
return buffer.readChar();
}
@Override
public float readFloat() {
checkReadableBytes(4);
return buffer.readFloat();
}
@Override
public double readDouble() {
checkReadableBytes(8);
return buffer.readDouble();
}
@Override
public ByteBuf resetReaderIndex() {
buffer.resetReaderIndex();
return this;
}
@Override
public ByteBuf resetWriterIndex() {
reject();
return this;
}
@Override
public ByteBuf setBoolean(int index, boolean value) {
reject();
return this;
}
@Override
public ByteBuf setByte(int index, int value) {
reject();
return this;
}
@Override
public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
reject();
return this;
}
@Override
public ByteBuf setBytes(int index, byte[] src) {
reject();
return this;
}
@Override
public ByteBuf setBytes(int index, ByteBuffer src) {
reject();
return this;
}
@Override
public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
reject();
return this;
}
@Override
public ByteBuf setBytes(int index, ByteBuf src, int length) {
reject();
return this;
}
@Override
public ByteBuf setBytes(int index, ByteBuf src) {
reject();
return this;
}
@Override
public int setBytes(int index, InputStream in, int length) {
reject();
return 0;
}
@Override
public ByteBuf setZero(int index, int length) {
reject();
return this;
}
@Override
public int setBytes(int index, ScatteringByteChannel in, int length) {
reject();
return 0;
}
@Override
public ByteBuf setIndex(int readerIndex, int writerIndex) {
reject();
return this;
}
@Override
public ByteBuf setInt(int index, int value) {
reject();
return this;
}
@Override
public ByteBuf setLong(int index, long value) {
reject();
return this;
}
@Override
public ByteBuf setMedium(int index, int value) {
reject();
return this;
}
@Override
public ByteBuf setShort(int index, int value) {
reject();
return this;
}
@Override
public ByteBuf setChar(int index, int value) {
reject();
return this;
}
@Override
public ByteBuf setFloat(int index, float value) {
reject();
return this;
}
@Override
public ByteBuf setDouble(int index, double value) {
reject();
return this;
}
@Override
public ByteBuf skipBytes(int length) {
checkReadableBytes(length);
buffer.skipBytes(length);
return this;
}
@Override
public ByteBuf slice() {
reject();
return this;
}
@Override
public ByteBuf slice(int index, int length) {
checkIndex(index, length);
return buffer.slice(index, length);
}
@Override
public int nioBufferCount() {
return buffer.nioBufferCount();
}
@Override
public ByteBuffer nioBuffer() {
reject();
return null;
}
@Override
public ByteBuffer nioBuffer(int index, int length) {
checkIndex(index, length);
return buffer.nioBuffer(index, length);
}
@Override
public ByteBuffer[] nioBuffers() {
reject();
return null;
}
@Override
public ByteBuffer[] nioBuffers(int index, int length) {
checkIndex(index, length);
return buffer.nioBuffers(index, length);
}
@Override
public ByteBuffer internalNioBuffer(int index, int length) {
checkIndex(index, length);
return buffer.internalNioBuffer(index, length);
}
@Override
public String toString(int index, int length, Charset charset) {
checkIndex(index, length);
return buffer.toString(index, length, charset);
}
@Override
public String toString(Charset charsetName) {
reject();
return null;
}
@Override
public String toString() {
return StringUtil.simpleClassName(this) + '(' +
"ridx=" +
readerIndex() +
", " +
"widx=" +
writerIndex() +
')';
}
@Override
public boolean isWritable() {
return false;
}
@Override
public boolean isWritable(int size) {
return false;
}
@Override
public int writableBytes() {
return 0;
}
@Override
public int maxWritableBytes() {
return 0;
}
@Override
public ByteBuf writeBoolean(boolean value) {
reject();
return this;
}
@Override
public ByteBuf writeByte(int value) {
reject();
return this;
}
@Override
public ByteBuf writeBytes(byte[] src, int srcIndex, int length) {
reject();
return this;
}
@Override
public ByteBuf writeBytes(byte[] src) {
reject();
return this;
}
@Override
public ByteBuf writeBytes(ByteBuffer src) {
reject();
return this;
}
@Override
public ByteBuf writeBytes(ByteBuf src, int srcIndex, int length) {
reject();
return this;
}
@Override
public ByteBuf writeBytes(ByteBuf src, int length) {
reject();
return this;
}
@Override
public ByteBuf writeBytes(ByteBuf src) {
reject();
return this;
}
@Override
public int writeBytes(InputStream in, int length) {
reject();
return 0;
}
@Override
public int writeBytes(ScatteringByteChannel in, int length) {
reject();
return 0;
}
@Override
public ByteBuf writeInt(int value) {
reject();
return this;
}
@Override
public ByteBuf writeLong(long value) {
reject();
return this;
}
@Override
public ByteBuf writeMedium(int value) {
reject();
return this;
}
@Override
public ByteBuf writeZero(int length) {
reject();
return this;
}
@Override
public int writerIndex() {
return buffer.writerIndex();
}
@Override
public ByteBuf writerIndex(int writerIndex) {
reject();
return this;
}
@Override
public ByteBuf writeShort(int value) {
reject();
return this;
}
@Override
public ByteBuf writeChar(int value) {
reject();
return this;
}
@Override
public ByteBuf writeFloat(float value) {
reject();
return this;
}
@Override
public ByteBuf writeDouble(double value) {
reject();
return this;
}
private void checkIndex(int index, int length) {
if (index + length > buffer.writerIndex()) {
throw REPLAY;
}
}
private void checkReadableBytes(int readableBytes) {
if (buffer.readableBytes() < readableBytes) {
throw REPLAY;
}
}
@Override
public ByteBuf discardSomeReadBytes() {
reject();
return this;
}
@Override
public int refCnt() {
return buffer.refCnt();
}
@Override
public ByteBuf retain() {
reject();
return this;
}
@Override
public ByteBuf retain(int increment) {
reject();
return this;
}
@Override
public boolean release() {
reject();
return false;
}
@Override
public boolean release(int decrement) {
reject();
return false;
}
@Override
public ByteBuf unwrap() {
reject();
return this;
}
private static void reject() {
throw new UnsupportedOperationException("not a replayable operation");
}
}