From a36d6e475d52207354378ca77809e409e43ae26a Mon Sep 17 00:00:00 2001
From: Mr_Goldberg <gold@berg>
Date: Thu, 11 Jun 2020 12:21:19 -0400
Subject: [PATCH] GetEncryptedAppTicket can be called with cbMaxTicket=0 to get
 the ticket size.

---
 dll/steam_user.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dll/steam_user.h b/dll/steam_user.h
index 77fda24..8caaa24 100644
--- a/dll/steam_user.h
+++ b/dll/steam_user.h
@@ -374,8 +374,15 @@ SteamAPICall_t RequestEncryptedAppTicket( void *pDataToInclude, int cbDataToIncl
 bool GetEncryptedAppTicket( void *pTicket, int cbMaxTicket, uint32 *pcbTicket )
 {
     PRINT_DEBUG("Steam_User::GetEncryptedAppTicket %i\n", cbMaxTicket);
-    if (!pcbTicket || !pTicket) return false;
+    if (!pcbTicket) return false;
     unsigned int ticket_size = encrypted_app_ticket.size() + 126;
+    if (!cbMaxTicket) {
+        *pcbTicket = ticket_size;
+        return true;
+    }
+
+    if (!pTicket) return false;
+
     //TODO figure out exact sizes?
     if (ticket_size < cbMaxTicket) cbMaxTicket = ticket_size;
     char ticket_base[] = {0x08, 0x01};