From 681f5fba40833f4c934976ee645bf3134ed32e80 Mon Sep 17 00:00:00 2001
From: Blu3train <frtempra@gmail.com>
Date: Tue, 25 Apr 2023 01:07:20 +0200
Subject: [PATCH] System-NNN engine hooks

---
 texthook/engine/engine.cc  | 124 +++++++++++++++++++++++++++++++++++++
 texthook/engine/engine.h   |   1 +
 texthook/engine/match32.cc |   4 ++
 3 files changed, 129 insertions(+)

diff --git a/texthook/engine/engine.cc b/texthook/engine/engine.cc
index c2c7abc..93e92f3 100644
--- a/texthook/engine/engine.cc
+++ b/texthook/engine/engine.cc
@@ -21728,6 +21728,130 @@ bool InsertNamcoPS2Hook()
 }
 #endif // 0
 
+bool SystemNNNFilter(LPVOID data, DWORD *size, HookParam *, BYTE)
+{
+  auto text = reinterpret_cast<LPSTR>(data);
+  auto len = reinterpret_cast<size_t *>(size);
+
+  StringCharReplacer(text, len, "\r\n", 2, ' ');
+  StringCharReplacer(text, len, "\x00FC\x00FE", 2, '\'');           // "\x00FC\x00FE"->italic
+  StringReplacer(text, len, "\x0081\x000E", 2, "\x0084\x009F", 2);  // "\x0081\x000E"->"─"
+
+  // Remove ruby: Shift-JIS "\x0023\x0081\x006D"->"#［" "\x0081\x006E"->"］"
+  if (cpp_strnstr(text, "\x0023\x0081\x006D", *len)) {
+    StringFilterBetween(text, len, "\x0023\x0081\x006D", 3, "\x0081\x006E", 2);
+  }
+  return true;
+}
+
+bool InsertSystemNNN1Hook() 
+{
+  //by Blu3train
+    /*
+    * Sample games:
+    * https://vndb.org/v33721
+    * https://vndb.org/v29300
+    * https://vndb.org/v26721
+    */
+  const BYTE bytes[] = {
+    0x8B, 0xDF,               // mov ebx,edi
+    0x8D, 0x4B, 0x01,         // lea ecx,[ebx+01]  << hook here
+    0x0F, 0x1F, 0x40, 0x00,   // nop dword ptr [eax+00]
+    0x8A, 0x03,               // mov al,[ebx]
+    0x43,                     // inc ebx
+    0x84, 0xC0,               // test al,al
+    0x75, 0xF9,               // jne exe+69320
+    0x2B, 0xD9                // sub ebx,ecx
+  };
+  //enum { addr_offset = sizeof(bytes) - 2 };
+  enum { addr_offset = 2 };
+
+  ULONG range = min(processStopAddress - processStartAddress, MAX_REL_ADDR);
+  ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), processStartAddress, processStartAddress + range);
+  if (!addr) {
+    ConsoleOutput("vnreng:System-NNN1: pattern not found");
+    return false;
+  }
+
+  HookParam hp = {};
+  hp.address = addr + addr_offset;
+  hp.offset = pusha_ebx_off -4;
+  hp.type = USING_STRING | NO_CONTEXT;
+  hp.filter_fun = SystemNNNFilter;
+  ConsoleOutput("vnreng: INSERT System-NNN1");
+  NewHook(hp, "System-NNN1");
+  return true;
+}
+
+bool SystemNNNqFilter(LPVOID data, DWORD *size, HookParam *, BYTE)
+{
+  auto text = reinterpret_cast<LPSTR>(data);
+  auto len = reinterpret_cast<size_t *>(size);
+  text[*len] = '\n';
+  (*len)++;
+  return true;
+}
+
+bool InsertSystemNNN2Hook() 
+{
+  //by Blu3train
+    /*
+    * Sample games:
+    * https://vndb.org/v933
+    */
+  const BYTE bytes[] = {
+    0x33, 0xC0,                          // xor eax,eax  << hook here
+    0xF2, 0xAE,                          // repne scasb 
+    0xF7, 0xD1,                          // not ecx
+    0x49,                                // dec ecx
+    0x89, 0x74, 0x24, 0x0C,              // mov [esp+0C],esi
+    0x3B, 0xCE,                          // cmp ecx,esi
+    0x89, 0x4C, 0x24, 0x10,              // mov [esp+10],ecx
+    0x0F, 0x8E, XX4                      // jng gss.exe+1A0DC
+  };
+  enum { addr_offset = 0};
+  ULONG range = min(processStopAddress - processStartAddress, MAX_REL_ADDR);
+  ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), processStartAddress, processStartAddress + range);
+  if (!addr) {
+    ConsoleOutput("vnreng:System-NNN2: pattern not found");
+    return false;
+  }
+
+  HookParam hp = {};
+  hp.address = addr + addr_offset;
+  hp.offset = pusha_edi_off -4;
+  hp.type = USING_STRING | NO_CONTEXT;
+  hp.filter_fun = SystemNNNFilter;
+  ConsoleOutput("vnreng: INSERT System-NNN2");
+  NewHook(hp, "System-NNN2");
+  
+  const BYTE bytes2[] = {
+    0xC1, 0xE9, 0x02,        // shr ecx,02
+    0xF3, 0xA5,              // repe movsd 
+    0x8B, 0xCB,              // mov ecx,ebx
+    0x8B, 0x54, 0x24, 0x1C,  // mov edx,[esp+1C]
+    0x83, 0xE1, 0x03,        // and ecx,03
+    0x03, 0xC5,              // add eax,ebp
+    0x33, 0xDB               // xor ebx,ebx
+  };
+  range = min(processStopAddress - processStartAddress, MAX_REL_ADDR);
+  addr = MemDbg::findBytes(bytes2, sizeof(bytes2), processStartAddress, processStartAddress + range);
+  if (addr) {
+    HookParam hp = {};
+    hp.address = addr;
+    hp.offset = pusha_esi_off -4;
+    hp.type = USING_STRING;
+    hp.filter_fun = SystemNNNqFilter;
+    ConsoleOutput("vnreng: INSERT System-NNN2q");
+    NewHook(hp, "System-NNN2q");
+  }
+
+  return true;
+}
+
+bool InsertSystemNNNHooks()
+{ return InsertSystemNNN1Hook() || InsertSystemNNN2Hook();}
+
 } // namespace Engine
 
 // EOF
diff --git a/texthook/engine/engine.h b/texthook/engine/engine.h
index 5e167b2..1193688 100644
--- a/texthook/engine/engine.h
+++ b/texthook/engine/engine.h
@@ -165,6 +165,7 @@ void InsertRealliveHook();      // RealLive: RealLive*.exe
 void InsertStuffScriptHook();   // Stuff: *.mpk
 bool InsertTinkerBellHook();    // TinkerBell: arc00.dat
 bool InsertWaffleHook();        // WAFFLE: cg.pak
+bool InsertSystemNNNHooks();    // System-NNN: nya/configse.xtx
 
 // CIRCUS: avdata/
 bool InsertCircusHook1();
diff --git a/texthook/engine/match32.cc b/texthook/engine/match32.cc
index fffc4c7..4acebe7 100644
--- a/texthook/engine/match32.cc
+++ b/texthook/engine/match32.cc
@@ -370,6 +370,10 @@ bool DetermineEngineByFile3()
 
 bool DetermineEngineByFile4()
 {
+  if (Util::CheckFile(L"nya/configse.xtx")) {
+    if (InsertSystemNNNHooks())
+      return true;
+  }
   if (Util::CheckFile(L"EAGLS.dll")) { // jichi 3/24/2014: E.A.G.L.S
     //ConsoleOutput("vnreng: IGNORE EAGLS");
     InsertEaglsHook();