documented packet structure

diff --git a/doc/protocol b/doc/protocol
index 63055a267fce123b022ef54ba6fdfad26ef649c4..a20d8d641073f3c561aa3b04e9076c38d034fd95 100644 (file)
--- a/doc/protocol
+++ b/doc/protocol
@@ -1,3 +1,23 @@
+Structure
+=========
+
+Offset  Size   Type  Description
+ 0      4      data  protocol tag, must be 0xFB1AB1AF
+ 4      2      uint  sequence number
+ 6      2      uint  sequence ack
+ 8      4      data  bitfield with previous acks
+12      1      uint  type code for the payload
+13      3      none  padding, reserved for future use
+16      0-484  data  payload, contents and length vary,
+                     mostly depending on the type code
+
+all multibyte values are in LE
+the current code does no conversion, so only works on machines
+with native LE (or BE if the server and all clients are on that,
+but that's by accident and will break if conversion code is ever
+added)
+
+
 Packets
 =======
 

diff --git a/src/net/Packet.hpp b/src/net/Packet.hpp
index af2f8727e3383669042365d2085c2f4c9a178083..5e9751cb434a29c1117a6203b6b59fe88e6a7430 100644 (file)
--- a/src/net/Packet.hpp
+++ b/src/net/Packet.hpp
@@ -27,6 +27,9 @@ struct Packet {
                std::uint32_t tag;
                TControl ctrl;
                std::uint8_t type;
+               std::uint8_t reserved1;
+               std::uint8_t reserved2;
+               std::uint8_t reserved3;
        } header;
 
        static constexpr std::size_t MAX_PAYLOAD_LEN = 500 - sizeof(Header);