Handles: use the 11-bit networked EHANDLE entity index

The client m_hActiveWeapon is a networked EHANDLE: low 11 bits are the
entity index and the rest is the serial. Masking with 0xFFFF included serial
bits, so on later maps the weapon index became garbage (e.g. 49184/12319)
and melee killbot could not recognize the crowbar. Use 0x7FF for client and
server active-weapon handles, weapon owner checks and item-ESP weapon skips.
Document the layout in CONTEXT.

2 files changed, 5 insertions, 5 deletions

diff --git a/src/esp.cpp b/src/esp.cpp
index a0d84dd..3db25e6 100644
--- a/src/esp.cpp
+++ b/src/esp.cpp
@@ -675,7 +675,7 @@ static bool active_weapon_contains(void *local_ent, const char *needle) {
   uint32_t h = *(uint32_t *)((uintptr_t)local_ent + g_net.activeweapon);
   if (h == 0xFFFFFFFFu)
     return false;
-  int idx = (int)(h & 0xFFFF);
+  int idx = (int)(h & 0x7FF); // networked EHANDLE: 11-bit entity index
   if (idx <= 0 || idx > 4096)
     return false;
   void *wep = entitylist_get(idx);
@@ -902,7 +902,7 @@ bool melee_weapon_active(void *local_ent) {
   if (g_net.activeweapon >= 0) {
     uint32_t h = *(uint32_t *)((uintptr_t)local_ent + g_net.activeweapon);
     if (h != 0xFFFFFFFFu)
-      idx = (int)(h & 0xFFFF);
+      idx = (int)(h & 0x7FF); // 11-bit entity index; upper bits are serial
   }
   const char *cls = nullptr, *model = nullptr;
   bool crowbar = check(idx, &cls, &model);
@@ -1221,7 +1221,7 @@ static bool active_weapon_is_shotgun(void *local_ent) {
   uint32_t h = *(uint32_t *)((uintptr_t)local_ent + g_net.activeweapon);
   if (h == 0xFFFFFFFFu)
     return false;
-  int idx = (int)(h & 0xFFFF);
+  int idx = (int)(h & 0x7FF); // networked EHANDLE: 11-bit entity index
   if (idx <= 0 || idx > 4096)
     return false;
   void *wep = entitylist_get(idx);
@@ -1486,7 +1486,7 @@ static int local_active_weapon_idx(int local_idx) {
   uint32_t h = *(uint32_t *)((uintptr_t)local + g_net.activeweapon);
   if (!item_handle_valid(h))
     return -1;
-  return (int)(h & 0xFFFF);
+  return (int)(h & 0x7FF);
 }
 
 static int classify_weapon(const char *model, const char *cls, char *label,
diff --git a/src/server.cpp b/src/server.cpp
index 115cd53..5599227 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -210,6 +210,6 @@ int server_active_weapon(int idx) {
   uint32_t h = *(uint32_t *)((uintptr_t)base + g_srv_activeweapon);
   if (h == 0xFFFFFFFFu)
     return -1;
-  int wi = (int)(h & 0xFFFF);
+  int wi = (int)(h & 0x7FF); // 11-bit entity index
   return (wi > 0 && wi <= 4096) ? wi : -1;
 }