change robot structure

mirai-core/src/main/java/net/mamoe/mirai/network/packet/ServerEvent.kt

 package net.mamoe.mirai.network.packet
 
+import net.mamoe.mirai.util.toUHexString
 import net.mamoe.mirai.utils.MiraiLogger
 import java.io.ByteArrayOutputStream
 import java.io.DataInputStream
@@ -32,7 +33,7 @@ class ServerGroupUploadFileEventPacket(input: DataInputStream, packetId: ByteArr
     lateinit var message: String
 
     override fun decode() {
-        message = String(this.input.goto(65).readNBytes(this.input.goto(60).readShort().toInt()))
+        message = String(this.input.goto(64).readNBytes(this.input.goto(60).readShort().toInt()))
     }//todo test
 }
 
@@ -46,12 +47,7 @@ class ServerGroupMessageEventPacket(input: DataInputStream, packetId: ByteArray,
         NORMAL,
         XML,
         AT,
-        FACE,//qq自带表情 [face107.gif]
-
-        PLAIN_TEXT, //纯文本
-        IMAGE, //自定义图片 {F50C5235-F958-6DF7-4EFA-397736E125A4}.gif
-
-        ANONYMOUS,//匿名用户发出的消息
+        IMAGE,
 
         OTHER,
     }
@@ -60,26 +56,17 @@ class ServerGroupMessageEventPacket(input: DataInputStream, packetId: ByteArray,
         group = this.input.goto(51).readInt()
         qq = this.input.goto(56).readInt()
         val fontLength = this.input.goto(108).readShort()
-        //println(this.input.goto(110 + fontLength).readNBytes(2).toUHexString())//always 00 00
+        println(this.input.goto(110 + fontLength).readNBytes(2).toUHexString())
 
         messageType = when (val id = this.input.goto(110 + fontLength + 2).readByte().toInt()) {
             19 -> MessageType.NORMAL
             14 -> MessageType.XML
+            2 -> MessageType.IMAGE
             6 -> MessageType.AT
 
-
-            1 -> MessageType.PLAIN_TEXT
-            2 -> MessageType.FACE
-            3 -> MessageType.IMAGE
-            25 -> MessageType.ANONYMOUS
-
-            else -> {
-                println("id=$id")
-                MessageType.OTHER
-            }
+            else -> MessageType.OTHER
         }
 
-
         when (messageType) {
             MessageType.NORMAL -> {
                 val gzippedMessage = this.input.goto(110 + fontLength + 16).readNBytes(this.input.goto(110 + fontLength + 3).readShort().toInt() - 11)
@@ -97,7 +84,7 @@ class ServerGroupMessageEventPacket(input: DataInputStream, packetId: ByteArray,
                 }
             }
 
-            MessageType.FACE -> {
+            MessageType.IMAGE -> {
                 val faceId = this.input.goto(110 + fontLength + 8).readByte()
                 message = "[face${faceId}.gif]"
             }
@@ -155,7 +142,7 @@ class ServerFriendMessageEventPacket(input: DataInputStream, packetId: ByteArray
         val fontLength = input.readShort(93+msgLength)
         val offset = msgLength+fontLength
         message = if(input.readByte(97+offset).toUHexString() == "02"){
-            "[face" + input.goto(103+offset).readVarString(1) + ".gif]"
+            "[face" + input.goto(103+offset).readByte(1).toInt().toString() + ".gif]"
             //.gif
         }else {
             val offset2 = input.readShort(101 + offset)