Add fix for new login protocol

src/main/java/net/minecraft/server/Packet1Login.java

@@ -0,0 +1,82 @@
+package net.minecraft.server;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException; // CraftBukkit
+
+public class Packet1Login extends Packet {
+
+    public int a;
+    public String name;
+    public long c;
+    public WorldType d;
+    public int e;
+    public byte f;
+    public byte g;
+    public byte h;
+    public byte i;
+
+    public Packet1Login() {}
+
+    public Packet1Login(String s, int i, long j, WorldType worldtype, int k, byte b0, byte b1, byte b2, byte b3) {
+        this.name = s;
+        this.a = i;
+        this.c = j;
+        this.d = worldtype;
+        this.f = b0;
+        this.g = b1;
+        this.e = k;
+        this.h = b2;
+        this.i = b3;
+    }
+
+    public void a(DataInputStream datainputstream) throws IOException { // CraftBukkit
+        this.a = datainputstream.readInt();
+        this.name = a(datainputstream, 16);
+        if (this.a < 23) return; // CraftBukkit
+        this.c = datainputstream.readLong();
+        String s = a(datainputstream, 16);
+
+        this.d = WorldType.a(s);
+        if (this.d == null) {
+            this.d = WorldType.NORMAL;
+        }
+
+        this.e = datainputstream.readInt();
+        this.f = datainputstream.readByte();
+        this.g = datainputstream.readByte();
+        this.h = datainputstream.readByte();
+        this.i = datainputstream.readByte();
+    }
+
+    public void a(DataOutputStream dataoutputstream) throws IOException { // CraftBukkit
+        dataoutputstream.writeInt(this.a);
+        a(this.name, dataoutputstream);
+        dataoutputstream.writeLong(this.c);
+        if (this.d == null) {
+            a("", dataoutputstream);
+        } else {
+            a(this.d.name(), dataoutputstream);
+        }
+
+        dataoutputstream.writeInt(this.e);
+        dataoutputstream.writeByte(this.f);
+        dataoutputstream.writeByte(this.g);
+        dataoutputstream.writeByte(this.h);
+        dataoutputstream.writeByte(this.i);
+    }
+
+    public void a(NetHandler nethandler) {
+        nethandler.a(this);
+    }
+
+    public int a() {
+        int i = 0;
+
+        if (this.d != null) {
+            i = this.d.name().length();
+        }
+
+        return 4 + this.name.length() + 4 + 7 + 4 + i;
+    }
+}