add：添加get_data接口。

include/of_util.h

@@ -39,6 +39,7 @@ public:
 public:
     void push(const char* data, int len);
     int index_of(const char* data, int len, int start_pos = 0);
+    const char* get_data() const;
     void remove_of(int start_pos, int len);
     void clear();
 private:

src/of_util.cpp

@@ -12,7 +12,6 @@ int CMutBuffer::index_of(const char* data, int len, int start_pos)
     if (start_pos < 0 || start_pos >= static_cast<int>(buffer_.size()) || len <= 0) {
         return -1;
     }
-
     auto it = std::search(buffer_.begin() + start_pos, buffer_.end(), data, data + len);
     if (it != buffer_.end()) {
         return std::distance(buffer_.begin(), it);
@@ -25,10 +24,15 @@ void CMutBuffer::remove_of(int start_pos, int len)
     if (start_pos < 0 || start_pos >= static_cast<int>(buffer_.size()) || len <= 0) {
         return;
     }
-
     auto end_pos = std::min(start_pos + len, static_cast<int>(buffer_.size()));
     buffer_.erase(buffer_.begin() + start_pos, buffer_.begin() + end_pos);
 }
+
+const char* CMutBuffer::get_data() const
+{
+    return buffer_.data();
+}
+
 void CMutBuffer::clear()
 {
     std::lock_guard<std::mutex> lock(mutex_);