From cfdeca99aca94a4b89fd777abd928e51b4535037 Mon Sep 17 00:00:00 2001
From: azw <vcl_delphi@126.com>
Date: Sat, 22 Apr 2023 09:44:29 +0000
Subject: [PATCH] 1

---
 a8/udpsession.cc | 43 +++++++++++++++++++++++++++++++++++++++++++
 a8/udpsession.h  | 12 ++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/a8/udpsession.cc b/a8/udpsession.cc
index be80019..028532c 100644
--- a/a8/udpsession.cc
+++ b/a8/udpsession.cc
@@ -1,5 +1,8 @@
 #include <a8/a8.h>
 
+#include <memory.h>
+#include <unistd.h>
+
 #include <a8/udpsession.h>
 
 static const int DEFAULT_MAX_PACKET_LEN = 1024 * 10;
@@ -28,4 +31,44 @@ namespace a8
         max_packet_len_ = std::max(max_packet_len, DEFAULT_MAX_PACKET_LEN);
     }
 
+    void UdpSession::OnSocketRead(char* buf, unsigned int buflen)
+    {
+        unsigned int already_read_bytes = 0;
+        do {
+            if (already_read_bytes < buflen) {
+                int read_bytes = std::min(buflen - already_read_bytes,
+                                          (unsigned int)max_packet_len_ - recv_bufflen_);
+                if (read_bytes > 0) {
+                    memmove(&recv_buff_[recv_bufflen_], buf + already_read_bytes, read_bytes);
+                    recv_bufflen_ += read_bytes;
+                    already_read_bytes += read_bytes;
+                }
+            }
+
+            int offset = 0;
+            int prev_offset = 0;
+            do {
+                prev_offset = offset;
+                DecodePacket(recv_buff_, offset, recv_bufflen_);
+            } while (prev_offset < offset && offset < recv_bufflen_);
+
+            if (offset > 0 && offset < recv_bufflen_){
+                memmove(recv_buff_, recv_buff_ + offset, recv_bufflen_ - offset);
+            }
+            recv_bufflen_ -= offset;
+            if (recv_bufflen_ >= max_packet_len_) {
+                //收到超长包
+                #if 0
+                Close();
+                #endif
+                return;
+            }
+        } while (already_read_bytes < buflen);
+    }
+
+    void UdpSession::DecodePacket(char* buf, int& offset, unsigned int buflen)
+    {
+        DecodeUserPacket(buf, offset, buflen);
+    }
+
 }
diff --git a/a8/udpsession.h b/a8/udpsession.h
index a0485ce..a6ef0b5 100644
--- a/a8/udpsession.h
+++ b/a8/udpsession.h
@@ -1,5 +1,10 @@
 #pragma once
 
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <sys/epoll.h>
+#include <netinet/tcp.h>
+
 namespace a8
 {
 
@@ -13,6 +18,13 @@ namespace a8
 
         void Update();
         void SetMaxPacketLen(int max_packet_len);
+        virtual void OnRecvPacket() = 0;
+        virtual void SendClientMsg(char* buf, int buf_len) = 0;
+
+    protected:
+        virtual void OnSocketRead(char* buf, unsigned int buflen);
+        virtual void DecodePacket(char* buf, int& offset, unsigned int buflen);
+        virtual void DecodeUserPacket(char* buf, int& offset, unsigned int buflen) = 0;
 
     private:
         a8::UdpListener* listener_ = nullptr;