Class MaplePacketDecoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.handler.codec.ByteToMessageDecoder

server.netty.MaplePacketDecoder

All Implemented Interfaces:

io.netty.channel.ChannelHandler, io.netty.channel.ChannelInboundHandler

public class MaplePacketDecoder
extends io.netty.handler.codec.ByteToMessageDecoder

Netty 入站處理器，負責將原始位元組流解密並還原為完整的封包位元組陣列。

繼承自 ByteToMessageDecoder，以兩段式狀態機運作：

• 第一段讀取 4 位元組封包頭，呼叫 MapleAESOFB.checkPacket(byte[]) 驗證合法性後取得封包長度， 存入 DecoderState；若長度不符則直接關閉連線。
• 第二段待緩衝區累積足夠位元組後，呼叫 MapleAESOFB.crypt(byte[]) 解密並將明文位元組陣列 推入 Netty pipeline 的下游（即 MapleServerHandler）。

當 ServerConstants.LOG_Handle_PACKETS 啟用時，於每個解密封包後印出 RecvPacketOpcode 名稱、包頭十六進位與封包長度，並寫入已知封包日誌。 DecoderState 以 Netty AttributeKey 綁定至個別 Channel，確保每個連線狀態互相獨立。

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MaplePacketDecoder.DecoderState

Nested classes/interfaces inherited from class io.netty.handler.codec.ByteToMessageDecoder

io.netty.handler.codec.ByteToMessageDecoder.Cumulator

Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

io.netty.channel.ChannelHandler.Sharable

Field Summary

Fields

Modifier and Type	Field	Description
static final io.netty.util.AttributeKey<MaplePacketDecoder.DecoderState>	DECODER_STATE_KEY

Fields inherited from class io.netty.handler.codec.ByteToMessageDecoder

COMPOSITE_CUMULATOR, MERGE_CUMULATOR

Constructor Summary

Constructors

Constructor	Description
MaplePacketDecoder()

Method Summary

Modifier and Type	Method	Description
protected void	decode(io.netty.channel.ChannelHandlerContext chc, io.netty.buffer.ByteBuf in, List<Object> message)

Methods inherited from class io.netty.handler.codec.ByteToMessageDecoder

actualReadableBytes, callDecode, channelInactive, channelRead, channelReadComplete, decodeLast, discardSomeReadBytes, handlerRemoved, handlerRemoved0, internalBuffer, isSingleDecode, setCumulator, setDiscardAfterReads, setSingleDecode, userEventTriggered

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, handlerAdded, isSharable

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.netty.channel.ChannelHandler

handlerAdded

Field Details

DECODER_STATE_KEY

public static final io.netty.util.AttributeKey<MaplePacketDecoder.DecoderState> DECODER_STATE_KEY

Constructor Details

MaplePacketDecoder

public MaplePacketDecoder()

Method Details

decode

protected void decode(io.netty.channel.ChannelHandlerContext chc,
 io.netty.buffer.ByteBuf in,
 List<Object> message)
               throws Exception

Specified by:

decode in class io.netty.handler.codec.ByteToMessageDecoder

Throws:

Exception