From 4570708c2dd9a8a22406ce988b6228917504085c Mon Sep 17 00:00:00 2001
From: Blu3train <frtempra@gmail.com>
Date: Sat, 28 Oct 2023 11:20:53 +0200
Subject: [PATCH] New NeXAS engine hook

---
 texthook/engine/engine.cc  | 57 ++++++++++++++++++++++++++++++++++++++
 texthook/engine/engine.h   |  2 +-
 texthook/engine/match32.cc |  2 +-
 3 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/texthook/engine/engine.cc b/texthook/engine/engine.cc
index c2c7abc..c7bb867 100644
--- a/texthook/engine/engine.cc
+++ b/texthook/engine/engine.cc
@@ -13209,6 +13209,63 @@ bool InsertNeXASHook()
   return true;
 }
 
+bool NeXAS2Filter(LPVOID data, DWORD *size, HookParam *, BYTE)
+{
+  auto text = reinterpret_cast<LPSTR>(data);
+  auto len = reinterpret_cast<size_t *>(size);
+  static std::string prevText;
+
+  StringCharReplacer(text, len, "@n", 2, ' ');
+  StringFilter(text, len, "@v", 7); // remove "@v" followed by 5 char
+  StringFilter(text, len, "@p", 2);
+  StringFilter(text, len, "@k", 2);
+  if (cpp_strnstr(text, "@", *len))
+    return false;
+
+  if (prevText.find(text, 0, *len) != std::string::npos) // Check if the string is present in the previous one
+    return false;
+  prevText.assign(text, *len);
+ 
+  return true;
+}
+
+bool InsertNeXAS2Hook() {
+	//by Blu3train
+	/*
+	* Sample games:
+	* https://vndb.org/r113353
+	*/
+	const BYTE bytes[] = {
+		0x50,                    // push eax             <- hook here
+		0xE8, XX4,               // call Aquarium.exe+2796B0
+		0x8B, 0x86, XX4,         // mov eax,[esi+000000A4]
+		0x8B, 0x40, 0xFC         // mov eax,[eax-04]
+	};
+
+	ULONG range = min(processStopAddress - processStartAddress, MAX_REL_ADDR);
+	ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), processStartAddress, processStartAddress + range);
+	if (!addr) {
+		ConsoleOutput("vnreng:NeXAS2: pattern not found");
+		return false;
+	}
+
+	HookParam hp = {};
+	hp.address = addr;
+	hp.offset = pusha_eax_off -4;
+    hp.index = 0;
+	hp.split = pusha_edx_off -4;
+    hp.split_index = 0;
+	hp.type = USING_STRING | USING_UTF8 | USING_SPLIT;
+	hp.filter_fun = NeXAS2Filter;
+	ConsoleOutput("vnreng: INSERT NeXAS2");
+	NewHook(hp, "NeXAS2");
+
+	return true;
+}
+
+bool InsertNeXASHooks()
+{ return InsertNeXASHook() || InsertNeXAS2Hook();}
+
 /** jichi 7/6/2014 YukaSystem2
  *  Sample game: セミラミスの天秤
  *
diff --git a/texthook/engine/engine.h b/texthook/engine/engine.h
index 5e167b2..2839635 100644
--- a/texthook/engine/engine.h
+++ b/texthook/engine/engine.h
@@ -121,7 +121,7 @@ bool InsertMEDHook();           // MED: *.med
 bool InsertMinkHook();          // Mink: *.at2
 //bool InsertMonoHook();          // Mono (Unity3D): */Mono/mono.dll
 bool InsertNekopackHook();      // Nekopack: *.dat
-bool InsertNeXASHook();         // NeXAS: Thumbnail.pac
+bool InsertNeXASHooks();        // NeXAS: Thumbnail.pac
 bool InsertNextonHook();        // NEXTON: aInfo.db
 bool InsertNexton1Hook();
 bool InsertNitroplusHook();     // Nitroplus: *.npa
diff --git a/texthook/engine/match32.cc b/texthook/engine/match32.cc
index fffc4c7..3315739 100644
--- a/texthook/engine/match32.cc
+++ b/texthook/engine/match32.cc
@@ -221,7 +221,7 @@ bool DetermineEngineByFile1()
 
     if (Util::CheckFile(L"Thumbnail.pac")) {
       //ConsoleOutput("vnreng: IGNORE NeXAS");
-      InsertNeXASHook(); // jichi 7/6/2014: GIGA
+      InsertNeXASHooks(); // jichi 7/6/2014: GIGA
       return true;
     }