add packet constructor which accepts payload buffer.

src/common/packet.cc

@@ -38,6 +38,16 @@ Packet::Packet (uint32_t size)
 {
   m_global_uid++;
 }
+Packet::Packet (uint8_t const*buffer, uint32_t size)
+  : m_buffer (),
+    m_uid (m_global_uid)
+{
+  m_global_uid++;
+  m_buffer.AddAtStart (size);
+  Buffer::Iterator i = m_buffer.Begin ();
+  i.Write (buffer, size);
+}
+
 Packet::Packet (Buffer buffer, Tags tags, uint32_t uid)
   : m_buffer (buffer),
     m_tags (tags),

src/common/packet.h

@@ -103,6 +103,15 @@ public:
    * \param size the size of the zero-filled payload
    */
   Packet (uint32_t size);
+  /**
+   * Create a packet with payload filled with the content
+   * of this buffer. The input data is copied: the input
+   * buffer is untouched.
+   *
+   * \param buffer the data to store in the packet.
+   * \param size the size of the input buffer.
+   */
+  Packet (uint8_t const*buffer, uint32_t size);
   /**
    * Create a new packet which contains a fragment of the original
    * packet. The returned packet shares the same uid as this packet.