add databuffer helper functions

include/misc/DataBuffer.h

@@ -85,6 +85,18 @@ public:
         return *this;
     }
 
+    void WriteSome(const char* buffer, std::size_t amount) {
+        std::size_t end_pos = m_Buffer.size();
+        m_Buffer.resize(m_Buffer.size() + amount);
+        memcpy(&m_Buffer[end_pos], buffer, amount);
+    }
+
+    void WriteSome(const std::uint8_t* buffer, std::size_t amount) {
+        std::size_t end_pos = m_Buffer.size();
+        m_Buffer.resize(m_Buffer.size() + amount);
+        memcpy(&m_Buffer[end_pos], buffer, amount);
+    }
+
     void ReadSome(char* buffer, std::size_t amount) {
         assert(m_ReadOffset + amount <= GetSize());
         std::copy_n(m_Buffer.begin() + static_cast<Data::difference_type>(m_ReadOffset), amount, buffer);