Explain the three values written by WriteSecBuf, in particular, why the

net/http/http_auth_handler_ntlm_portable.cc

Index: net/http/http_auth_handler_ntlm_portable.cc
diff --git a/net/http/http_auth_handler_ntlm_portable.cc b/net/http/http_auth_handler_ntlm_portable.cc
index 035a6dc80170c091536c615c49c013332ce13b73..237e33a9825efe6a9885bdb2abfe286fa673e558 100644
--- a/net/http/http_auth_handler_ntlm_portable.cc
+++ b/net/http/http_auth_handler_ntlm_portable.cc
@@ -195,8 +195,12 @@ static void* WriteSecBuf(void* buf, uint16 length, uint32 offset) {
   length = SWAP16(length);
   offset = SWAP32(offset);
 #endif
+  // Len: 2 bytes.
   buf = WriteBytes(buf, &length, sizeof(length));
+  // MaxLen: 2 bytes. The sender should set it to the value of Len. The
+  // recipient must ignore it.
   buf = WriteBytes(buf, &length, sizeof(length));
+  // BufferOffset: 4 bytes.
   buf = WriteBytes(buf, &offset, sizeof(offset));
   return buf;
 }