From 7a72473daac48164b0ea2618421312d7dd854095 Mon Sep 17 00:00:00 2001
From: Mrs4s <1844812067@qq.com>
Date: Sat, 20 Feb 2021 14:34:12 +0800
Subject: [PATCH] fix t119 panic.

---
 client/c2c_processor.go | 1 -
 client/group_file.go    | 2 +-
 client/tlv_decoders.go  | 8 +++++---
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/client/c2c_processor.go b/client/c2c_processor.go
index 9d149007..319e61ae 100644
--- a/client/c2c_processor.go
+++ b/client/c2c_processor.go
@@ -11,7 +11,6 @@ import (
 	"google.golang.org/protobuf/proto"
 )
 
-// com.tencent.mobileqq.app.QQMessageFacadeConfig::start
 var c2cDecoders = map[int32]func(*QQClient, *msg.Message){
 	33: troopAddMemberBroadcastDecoder,
 	35: troopSystemMessageDecoder, 36: troopSystemMessageDecoder, 37: troopSystemMessageDecoder,
diff --git a/client/group_file.go b/client/group_file.go
index 402cd4c6..3e1af9af 100644
--- a/client/group_file.go
+++ b/client/group_file.go
@@ -4,6 +4,7 @@ import (
 	"crypto/sha1"
 	"encoding/hex"
 	"fmt"
+	"google.golang.org/protobuf/proto"
 	"io"
 	"math/rand"
 	"os"
@@ -13,7 +14,6 @@ import (
 	"github.com/Mrs4s/MiraiGo/client/pb/oidb"
 	"github.com/Mrs4s/MiraiGo/protocol/packets"
 	"github.com/Mrs4s/MiraiGo/utils"
-	"github.com/golang/protobuf/proto"
 	"github.com/pkg/errors"
 )
 
diff --git a/client/tlv_decoders.go b/client/tlv_decoders.go
index b1e0e296..88c6e0fb 100644
--- a/client/tlv_decoders.go
+++ b/client/tlv_decoders.go
@@ -104,9 +104,11 @@ func (c *QQClient) decodeT119(data []byte) {
 	}
 	key := md5.Sum(append(append(c.PasswordMd5[:], []byte{0x00, 0x00, 0x00, 0x00}...), binary.NewWriterF(func(w *binary.Writer) { w.WriteUInt32(uint32(c.Uin)) })...))
 	decrypted := binary.NewTeaCipher(key[:]).Decrypt(c.sigInfo.encryptedA1)
-	dr := binary.NewReader(decrypted)
-	dr.ReadBytes(51)
-	SystemDeviceInfo.TgtgtKey = dr.ReadBytes(16)
+	if len(decrypted) > 51+16 {
+		dr := binary.NewReader(decrypted)
+		dr.ReadBytes(51)
+		SystemDeviceInfo.TgtgtKey = dr.ReadBytes(16)
+	}
 	c.Nickname = nick
 	c.Age = age
 	c.Gender = gender