From 5728e103c3e230b36114b80a7b61d8ea40c06dd7 Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Fri, 30 Oct 2026 05:54:13 +0000
Subject: [PATCH] Decompile 7 functions in Source/Client/SessionPredicates.cpp,
 Source/Client/Session.h

Batch #4672 by eAthena: 0 byte-identical, 7 confirmed by peer review.

- fn_23850 CSession::IsState291To303: logic confirmed by peer review
- fn_23852 CSession::IsType0Or4: logic confirmed by peer review
- fn_23879 CSession::IsMonsterActor: logic confirmed by peer review
- fn_23880 CSession::IsLocalPlayerAid: logic confirmed by peer review
- fn_23881 CSession::IsHomunAid: logic confirmed by peer review
- fn_23882 CSession::IsMercenaryAid: logic confirmed by peer review
- fn_23885 CSession::IsPetAid: logic confirmed by peer review

Peer-reviewed-by: youko, Bruwuno
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
Adds to the build: Source/Client/SessionPredicates.cpp
---
 Source/Client/Session.h             |  8 +++
 Source/Client/SessionPredicates.cpp | 89 +++++++++++++++++++++++++++++
 data/compile.json                   |  1 +
 3 files changed, 98 insertions(+)
 create mode 100644 Source/Client/SessionPredicates.cpp

diff --git a/Source/Client/Session.h b/Source/Client/Session.h
index 24f36554..5c1c6220 100644
--- a/Source/Client/Session.h
+++ b/Source/Client/Session.h
@@ -19,6 +19,7 @@
 #include <vector>
 
 class CActRes;
+class CGameActor;
 class CRenderObject;
 class LuaScript;
 struct JobNameInitialization;
@@ -359,6 +360,13 @@ public:
   int GetMapProperty12() const;
   int GetMapProperty13() const;
   bool HasUnknown6178Records() const;
+  int IsState291To303(int state) const;
+  int IsType0Or4(int type) const;
+  int IsMonsterActor(CGameActor* actor) const;
+  int IsLocalPlayerAid(std::uint32_t aid) const;
+  bool IsHomunAid(std::uint32_t aid) const;
+  bool IsMercenaryAid(std::uint32_t aid) const;
+  bool IsPetAid(std::uint32_t aid) const;
   bool IsEquipItemType(int type) const;
   bool IsMiscItemType(int type) const;
   bool IsSuperNoviceJob(int job) const;
diff --git a/Source/Client/SessionPredicates.cpp b/Source/Client/SessionPredicates.cpp
new file mode 100644
index 00000000..b9d1dbcf
--- /dev/null
+++ b/Source/Client/SessionPredicates.cpp
@@ -0,0 +1,89 @@
+#include "Client/Mode/CGameMode.h"
+#include "Client/Mode/ModeMgr.h"
+#include "Client/Session.h"
+#include "Contents/Actors/GameActor.h"
+#include "Contents/Actors/Pc.h"
+#include "Contents/World/World.h"
+
+#include <cstdint>
+
+// OFFSET: 0x00E1D6B0
+// FUNCTION: fn_23850
+int CSession::IsState291To303(int state) const {
+  switch (state) {
+  case 291:
+  case 292:
+  case 293:
+  case 294:
+  case 295:
+  case 297:
+  case 298:
+  case 299:
+  case 300:
+  case 301:
+  case 302:
+  case 303:
+    return 1;
+  default:
+    return 0;
+  }
+}
+
+// OFFSET: 0x00E1D850
+// FUNCTION: fn_23852
+int CSession::IsType0Or4(int type) const {
+  if (type == 0 || type == 4) {
+    return 1;
+  }
+  return 0;
+}
+
+// OFFSET: 0x00E1DD50
+// FUNCTION: fn_23879
+int CSession::IsMonsterActor(CGameActor* actor) const {
+  if (!actor) {
+    return 0;
+  }
+
+  const int job = actor->GetEffectiveJob(-1);
+  if ((job > 1000 && job < 4000) || (job >= 20021 && job <= 31999)) {
+    return 1;
+  }
+
+  if (actor->GetEffectiveJob(-1) >= 2114) {
+    actor->GetEffectiveJob(-1);
+  }
+  return 0;
+}
+
+// OFFSET: 0x00E1DDB0
+// FUNCTION: fn_23880
+int CSession::IsLocalPlayerAid(std::uint32_t aid) const {
+  if (aid == 0) {
+    return 0;
+  }
+
+  CPlayer* player = static_cast<CGameMode*>(g_modeMgr.GetGameMode())->scene->player;
+  if (player && aid == static_cast<std::uint32_t>(player->Slot50())) {
+    return 1;
+  }
+  return 0;
+}
+
+// OFFSET: 0x00E1DDF0
+// FUNCTION: fn_23881
+bool CSession::IsHomunAid(std::uint32_t aid) const {
+  return aid != 0xFFFFFFFF && aid == *reinterpret_cast<const std::uint32_t*>(&this->unknown_5570[8]);
+}
+
+// OFFSET: 0x00E1DE10
+// FUNCTION: fn_23882
+bool CSession::IsMercenaryAid(std::uint32_t aid) const {
+  return aid != 0xFFFFFFFF && aid == *reinterpret_cast<const std::uint32_t*>(&this->unknown_5620[8]);
+}
+
+// OFFSET: 0x00E1DF00
+// FUNCTION: fn_23885
+bool CSession::IsPetAid(std::uint32_t aid) const {
+  return aid != 0xFFFFFFFF && aid == this->unknown_1010;
+}
diff --git a/data/compile.json b/data/compile.json
index fc9aa423..750d436f 100644
--- a/data/compile.json
+++ b/data/compile.json
@@ -280,6 +280,7 @@
   "Source/Client/ReplayPacketRecorder.cpp": 2,
   "Source/Client/Session.cpp": 0,
   "Source/Client/SessionParty.cpp": 0,
+  "Source/Client/SessionPredicates.cpp": 0,
   "Source/Client/Stove/StoveMgr.cpp": 0,
   "Source/Client/Timer.cpp": 0,
   "Source/Contents/AchievementMgr.cpp": 4,