update

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

@@ -91,4 +91,13 @@ fun DataInputStream.readVarString(length:Int): String{
 }
 
 
-fun ByteArray.dataInputStream(): DataInputStream = DataInputStream(this.inputStream())
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+fun ByteArray.dataInputStream(): DataInputStream = DataInputStream(this.inputStream())
+
+/**
+ * Reset and skip(position)
+ */
+fun <N : Number> DataInputStream.goto(position: N): DataInputStream {
+    this.reset()
+    this.skip(position.toLong());
+    return this
+}
\ No newline at end of file