update

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

@@ -96,8 +96,28 @@ fun ByteArray.dataInputStream(): DataInputStream = DataInputStream(this.inputStr
 /**
  * Reset and skip(position)
  */
-fun <N : Number> DataInputStream.goto(position: N): DataInputStream {
+infix fun <N : Number> DataInputStream.goto(position: N): DataInputStream {
     this.reset()
     this.skip(position.toLong());
     return this
+}
+
+fun <N : Number> DataInputStream.readNBytes(position: N, length: Int): ByteArray {
+    this.goto(position)
+    return this.readNBytes(length)
+}
+
+fun <N : Number> DataInputStream.readInt(position: N): Int {
+    this.goto(position)
+    return this.readInt();
+}
+
+fun <N : Number> DataInputStream.readByte(position: N): Byte {
+    this.goto(position)
+    return this.readByte();
+}
+
+fun <N : Number> DataInputStream.readShort(position: N): Short {
+    this.goto(position)
+    return this.readShort();
 }
\ No newline at end of file