/**
* Copyright 2012 Nikita Koksharov
*
* Licensed 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 com.corundumstudio.socketio.protocol;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufInputStream;
import io.netty.buffer.ByteBufProcessor;
import io.netty.buffer.Unpooled;
import io.netty.util.CharsetUtil;
import java.io.IOException;
import java.net.URLDecoder;
import java.util.UUID;
import com.corundumstudio.socketio.AckCallback;
import com.corundumstudio.socketio.ack.AckManager;
public class PacketDecoder {
private final JsonSupport jsonSupport;
private final AckManager ackManager;
public PacketDecoder(JsonSupport jsonSupport, AckManager ackManager) {
this.jsonSupport = jsonSupport;
this.ackManager = ackManager;
}
// TODO optimize
public ByteBuf preprocessJson(Integer jsonIndex, ByteBuf content) throws IOException {
String packet = URLDecoder.decode(content.toString(CharsetUtil.UTF_8), CharsetUtil.UTF_8.name());
if (jsonIndex != null) {
// skip "d="
packet = packet.substring(2);
}
int splitIndex = packet.indexOf(":");
String len = packet.substring(0, splitIndex);
Integer length = Integer.valueOf(len);
packet = packet.substring(splitIndex+1, splitIndex+length+1);
packet = new String(packet.getBytes(CharsetUtil.ISO_8859_1), CharsetUtil.UTF_8);
return Unpooled.wrappedBuffer(packet.getBytes(CharsetUtil.UTF_8));
}
// fastest way to parse chars to int
private long parseLong(ByteBuf chars, int length) {
long result = 0;
for (int i = chars.readerIndex(); i < length; i++) {
int digit = ((int)chars.getByte(i) & 0xF);
for (int j = 0; j < length-1-i; j++) {
digit *= 10;
}
result += digit;
}
return result;
}
private PacketType readType(ByteBuf buffer) {
int typeId = buffer.readByte() & 0xF;
return PacketType.valueOf(typeId);
}
private PacketType readInnerType(ByteBuf buffer) {
int typeId = buffer.readByte() & 0xF;
return PacketType.valueOfInner(typeId);
}
@Deprecated
public Packet decodePacket(String string, UUID uuid) throws IOException {
ByteBuf buf = Unpooled.copiedBuffer(string, CharsetUtil.UTF_8);
try {
return null;
} finally {
buf.release();
}
}
private static int find(ByteBuf buffer, final char item) {
int index = buffer.forEachByte(buffer.readerIndex(), buffer.readableBytes(), new ByteBufProcessor() {
@Override
public boolean process(byte value) throws Exception {
return value != item;
}
});
return index;
}
public Packet decodePackets(ByteBuf buffer, UUID uuid) throws IOException {
boolean isString = buffer.getByte(0) == 0x0;
if (isString) {
int headEndIndex = buffer.forEachByte(new ByteBufProcessor() {
@Override
public boolean process(byte value) throws Exception {
return value != -1;
}
});
int len = (int) parseLong(buffer, headEndIndex);
buffer.readerIndex(buffer.readerIndex() + headEndIndex);
ByteBuf frame = buffer.slice(buffer.readerIndex() + 1, len);
// skip this frame
buffer.readerIndex(buffer.readerIndex() + 1 + len);
return decode(uuid, frame);
}
return decode(uuid, buffer);
}
private String readString(ByteBuf frame) {
return readString(frame, frame.readableBytes());
}
private String readString(ByteBuf frame, int size) {
byte[] bytes = new byte[size];
frame.readBytes(bytes);
return new String(bytes, CharsetUtil.UTF_8);
}
private Packet decode(UUID uuid, ByteBuf frame) throws IOException {
PacketType type = readType(frame);
Packet packet = new Packet(type);
if (type == PacketType.PING) {
packet.setData(readString(frame));
return packet;
}
if (!frame.isReadable()) {
return packet;
}
PacketType innerType = readInnerType(frame);
packet.setSubType(innerType);
int endIndex = find(frame, '[');
if (endIndex > frame.readerIndex()) {
// TODO optimize
String nspAckId = readString(frame, endIndex - frame.readerIndex());
if (nspAckId.contains(",")) {
String[] parts = nspAckId.split(",");
String nsp = parts[0];
packet.setNsp(nsp);
if (parts.length > 1) {
String ackId = parts[1];
packet.setAckId(Long.valueOf(ackId));
}
} else {
packet.setAckId(Long.valueOf(nspAckId));
}
}
if (packet.getType() == PacketType.MESSAGE) {
if (packet.getSubType() == PacketType.CONNECT
|| packet.getSubType() == PacketType.DISCONNECT) {
packet.setNsp(readString(frame));
}
if (packet.getSubType() == PacketType.ACK) {
ByteBufInputStream in = new ByteBufInputStream(frame);
AckCallback<?> callback = ackManager.getCallback(uuid, packet.getAckId());
AckArgs args = jsonSupport.readAckArgs(in, callback);
packet.setData(args.getArgs());
}
if (packet.getSubType() == PacketType.EVENT) {
ByteBufInputStream in = new ByteBufInputStream(frame);
Event event = jsonSupport.readValue(in, Event.class);
packet.setName(event.getName());
packet.setData(event.getArgs());
}
}
return packet;
}
}