Add connection message type

src/main.zig

@@ -1,12 +1,20 @@
-//! By convention, main.zig is where your main function lives in the case that
-//! you are building an executable. If you are making a library, the convention
-//! is to delete this file and start with root.zig instead.
-
 const is_debug = builtin.mode == .Debug;
 
 const SaprusPacketType = enum(u16) {
     relay = 0x003C,
     file_transfer = 0x8888,
+    connection = 0x00E9,
+};
+
+const SaprusConnectionOptions = packed struct {
+    opt1: bool = false,
+    opt2: bool = false,
+    opt3: bool = false,
+    opt4: bool = false,
+    opt5: bool = false,
+    opt6: bool = false,
+    opt7: bool = false,
+    opt8: bool = false,
 };
 
 const SaprusMessage = union(SaprusPacketType) {
@@ -15,6 +23,14 @@ const SaprusMessage = union(SaprusPacketType) {
         payload: []u8,
     },
     file_transfer: void, // unimplemented
+    connection: struct {
+        src_port: u16,
+        dest_port: u16,
+        seq_num: u32 = 0,
+        msg_id: u32 = 0,
+        reserved: u8 = 0,
+        options: SaprusConnectionOptions = .{},
+    },
 
     const Self = @This();
 
@@ -24,12 +40,20 @@ const SaprusMessage = union(SaprusPacketType) {
         try w.writeInt(u16, @intFromEnum(@as(SaprusPacketType, s)), .big);
 
         switch (s) {
-            .relay => |relay| {
-                try w.writeAll(&relay.dest);
-                try w.writeInt(u16, @intCast(relay.payload.len), .big);
-                try w.writeAll(relay.payload);
+            .relay => |r| {
+                try w.writeAll(&r.dest);
+                try w.writeInt(u16, @intCast(r.payload.len), .big);
+                try w.writeAll(r.payload);
             },
             .file_transfer => unreachable,
+            .connection => |c| {
+                try w.writeInt(u16, c.src_port, .big);
+                try w.writeInt(u16, c.dest_port, .big);
+                try w.writeInt(u32, c.seq_num, .big);
+                try w.writeInt(u32, c.msg_id, .big);
+                try w.writeInt(u8, c.reserved, .big);
+                try w.writeStruct(c.options);
+            },
         }
 
         return buf.toOwnedSlice();