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IOParser.java
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IOParser.java
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package io.socket.parser;
import io.socket.hasbinary.HasBinary;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
final public class IOParser implements Parser {
private static final Logger logger = Logger.getLogger(IOParser.class.getName());
private IOParser() {}
final public static class Encoder implements Parser.Encoder {
public Encoder() {}
@Override
public void encode(Packet obj, Callback callback) {
if ((obj.type == EVENT || obj.type == ACK) && HasBinary.hasBinary(obj.data)) {
obj.type = obj.type == EVENT ? BINARY_EVENT : BINARY_ACK;
}
if (logger.isLoggable(Level.FINE)) {
logger.fine(String.format("encoding packet %s", obj));
}
if (BINARY_EVENT == obj.type || BINARY_ACK == obj.type) {
encodeAsBinary(obj, callback);
} else {
String encoding = encodeAsString(obj);
callback.call(new String[] {encoding});
}
}
private String encodeAsString(Packet obj) {
StringBuilder str = new StringBuilder("" + obj.type);
if (BINARY_EVENT == obj.type || BINARY_ACK == obj.type) {
str.append(obj.attachments);
str.append("-");
}
if (obj.nsp != null && obj.nsp.length() != 0 && !"/".equals(obj.nsp)) {
str.append(obj.nsp);
str.append(",");
}
if (obj.id >= 0) {
str.append(obj.id);
}
if (obj.data != null) {
str.append(obj.data);
}
if (logger.isLoggable(Level.FINE)) {
logger.fine(String.format("encoded %s as %s", obj, str));
}
return str.toString();
}
private void encodeAsBinary(Packet obj, Callback callback) {
Binary.DeconstructedPacket deconstruction = Binary.deconstructPacket(obj);
String pack = encodeAsString(deconstruction.packet);
List<Object> buffers = new ArrayList<Object>(Arrays.asList(deconstruction.buffers));
buffers.add(0, pack);
callback.call(buffers.toArray());
}
}
final public static class Decoder implements Parser.Decoder {
/*package*/ BinaryReconstructor reconstructor;
private Decoder.Callback onDecodedCallback;
public Decoder() {
this.reconstructor = null;
}
@Override
public void add(String obj) {
Packet packet = decodeString(obj);
if (BINARY_EVENT == packet.type || BINARY_ACK == packet.type) {
this.reconstructor = new BinaryReconstructor(packet);
if (this.reconstructor.reconPack.attachments == 0) {
if (this.onDecodedCallback != null) {
this.onDecodedCallback.call(packet);
}
}
} else {
if (this.onDecodedCallback != null) {
this.onDecodedCallback.call(packet);
}
}
}
@Override
public void add(byte[] obj) {
if (this.reconstructor == null) {
throw new RuntimeException("got binary data when not reconstructing a packet");
} else {
Packet packet = this.reconstructor.takeBinaryData(obj);
if (packet != null) {
this.reconstructor = null;
if (this.onDecodedCallback != null) {
this.onDecodedCallback.call(packet);
}
}
}
}
private static Packet decodeString(String str) {
int i = 0;
int length = str.length();
Packet<Object> p = new Packet<>(Character.getNumericValue(str.charAt(0)));
if (p.type < 0 || p.type > types.length - 1) {
throw new DecodingException("unknown packet type " + p.type);
}
if (BINARY_EVENT == p.type || BINARY_ACK == p.type) {
if (!str.contains("-") || length <= i + 1) {
throw new DecodingException("illegal attachments");
}
StringBuilder attachments = new StringBuilder();
while (str.charAt(++i) != '-') {
attachments.append(str.charAt(i));
}
p.attachments = Integer.parseInt(attachments.toString());
}
if (length > i + 1 && '/' == str.charAt(i + 1)) {
StringBuilder nsp = new StringBuilder();
while (true) {
++i;
char c = str.charAt(i);
if (',' == c) break;
nsp.append(c);
if (i + 1 == length) break;
}
p.nsp = nsp.toString();
} else {
p.nsp = "/";
}
if (length > i + 1){
Character next = str.charAt(i + 1);
if (Character.getNumericValue(next) > -1) {
StringBuilder id = new StringBuilder();
while (true) {
++i;
char c = str.charAt(i);
if (Character.getNumericValue(c) < 0) {
--i;
break;
}
id.append(c);
if (i + 1 == length) break;
}
try {
p.id = Integer.parseInt(id.toString());
} catch (NumberFormatException e){
throw new DecodingException("invalid payload");
}
}
}
if (length > i + 1){
try {
str.charAt(++i);
p.data = new JSONTokener(str.substring(i)).nextValue();
} catch (JSONException e) {
logger.log(Level.WARNING, "An error occured while retrieving data from JSONTokener", e);
throw new DecodingException("invalid payload");
}
if (!isPayloadValid(p.type, p.data)) {
throw new DecodingException("invalid payload");
}
}
if (logger.isLoggable(Level.FINE)) {
logger.fine(String.format("decoded %s as %s", str, p));
}
return p;
}
private static boolean isPayloadValid(int type, Object payload) {
switch (type) {
case Parser.CONNECT:
case Parser.CONNECT_ERROR:
return payload instanceof JSONObject;
case Parser.DISCONNECT:
return payload == null;
case Parser.EVENT:
case Parser.BINARY_EVENT:
return payload instanceof JSONArray
&& ((JSONArray) payload).length() > 0
&& !((JSONArray) payload).isNull(0);
case Parser.ACK:
case Parser.BINARY_ACK:
return payload instanceof JSONArray;
default:
return false;
}
}
@Override
public void destroy() {
if (this.reconstructor != null) {
this.reconstructor.finishReconstruction();
}
this.onDecodedCallback = null;
}
@Override
public void onDecoded (Callback callback) {
this.onDecodedCallback = callback;
}
}
/*package*/ static class BinaryReconstructor {
public Packet reconPack;
/*package*/ List<byte[]> buffers;
BinaryReconstructor(Packet packet) {
this.reconPack = packet;
this.buffers = new ArrayList<>();
}
public Packet takeBinaryData(byte[] binData) {
this.buffers.add(binData);
if (this.buffers.size() == this.reconPack.attachments) {
Packet packet = Binary.reconstructPacket(this.reconPack,
this.buffers.toArray(new byte[this.buffers.size()][]));
this.finishReconstruction();
return packet;
}
return null;
}
public void finishReconstruction () {
this.reconPack = null;
this.buffers = new ArrayList<>();
}
}
}