diff --git a/src/hook.c b/src/hook.c
new file mode 100644
index 0000000000..6c8dd9395a
--- /dev/null
+++ b/src/hook.c
@@ -0,0 +1,201 @@
+/*****************************************************************************
+ * Copyright (c) 2014 Ted John
+ * OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
+ *
+ * This file is part of OpenRCT2.
+ *
+ * OpenRCT2 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ *****************************************************************************/
+
+#include
+#include "hook.h"
+
+void* g_hooktableaddress = 0;
+int g_hooktableoffset = 0;
+int g_maxhooks = 1000;
+
+void hookfunc(int address, int newaddress, int stacksize, int registerargs[], int registersreturned)
+{
+ int i = 0;
+ char data[100];
+
+ int registerssaved = 7;
+ int n = registersreturned;
+ for (; n; registerssaved--) {
+ n &= n - 1;
+ }
+ int numrargs = 0;
+ for (int j = 0; ; j++) {
+ if (registerargs[j] != END) {
+ numrargs++;
+ } else {
+ break;
+ }
+ }
+
+ int rargssize = numrargs * 4;
+
+ data[i++] = 0x50; // push eax
+
+ // move stack down for possible existing arguments
+ for (int j = 0; j < stacksize; j++) {
+ data[i++] = 0x8B; // mov eax, [esp+x]
+ data[i++] = 0x44;
+ data[i++] = 0xE4;
+ data[i++] = (signed char)((4 * (stacksize - j)) + 4);
+
+ data[i++] = 0x89; // mov [esp+x], eax
+ data[i++] = 0x44;
+ data[i++] = 0xE4;
+ data[i++] = (signed char)((4 * (stacksize - j)) - ((registerssaved + stacksize) * 4));
+ }
+
+ if (numrargs > 0) {
+ // push the registers to be on the stack to access as arguments
+ data[i++] = 0x83; // add esp, x
+ data[i++] = 0xC4;
+ data[i++] = -((registerssaved + stacksize) * 4) + 4;
+
+ for (signed int j = numrargs - 1; j >= 0; j--) {
+ switch (registerargs[j]) {
+ case EAX: data[i++] = 0x50; break;
+ case EBX: data[i++] = 0x53; break;
+ case ECX: data[i++] = 0x51; break;
+ case EDX: data[i++] = 0x52; break;
+ case ESI: data[i++] = 0x56; break;
+ case EDI: data[i++] = 0x57; break;
+ case EBP: data[i++] = 0x55; break;
+ }
+ }
+
+ data[i++] = 0x83; // add esp, x
+ data[i++] = 0xC4;
+ data[i++] = rargssize + ((registerssaved + stacksize) * 4) - 4;
+ }
+
+
+ data[i++] = 0xE8; // call
+ data[i++] = 0x00;
+ data[i++] = 0x00;
+ data[i++] = 0x00;
+ data[i++] = 0x00;
+
+ int sizec = i;
+
+ data[i++] = 0x8B; // push eax, [esp] - puts eip in eax
+ data[i++] = 0x04;
+ data[i++] = 0xE4;
+
+ data[i++] = 0x83; // add eax, x
+ data[i++] = 0xC0;
+ int sizeoffset = i;
+ data[i++] = 0; // set to returnlocation offset later
+
+ data[i++] = 0x89; // mov [esp-20h], eax - put return address on stack
+ data[i++] = 0x44;
+ data[i++] = 0xE4;
+ data[i++] = (signed char)(-(registerssaved * 4) - rargssize - (stacksize * 4)) + 4;
+
+ data[i++] = 0x83; // add esp, x
+ data[i++] = 0xC4;
+ data[i++] = 4;
+
+ data[i++] = 0x58; // pop eax
+
+ if (!(registersreturned & EAX)) {
+ data[i++] = 0x50; // push eax
+ }
+ if (!(registersreturned & EBX)) {
+ data[i++] = 0x53; // push ebx
+ }
+ if (!(registersreturned & ECX)) {
+ data[i++] = 0x51; // push ecx
+ }
+ if (!(registersreturned & EDX)) {
+ data[i++] = 0x52; // push edx
+ }
+ if (!(registersreturned & EBP)) {
+ data[i++] = 0x55; // push ebp
+ }
+ if (!(registersreturned & ESI)) {
+ data[i++] = 0x56; // push esi
+ }
+ if (!(registersreturned & EDI)) {
+ data[i++] = 0x57; // push edi
+ }
+
+ data[i++] = 0x83; // sub esp, x
+ data[i++] = 0xEC;
+ data[i++] = 4 + (stacksize * 4) + rargssize;
+
+ data[i++] = 0xEA; // jmp
+ *((int *)&data[i]) = newaddress; i += 4;
+ data[i++] = 0x23;
+ data[i++] = 0x00;
+
+ data[sizeoffset] = i - sizec;
+
+ // returnlocation:
+
+ data[i++] = 0x83; // sub esp, x
+ data[i++] = 0xEC;
+ data[i++] = (signed char)(stacksize * -4) - rargssize;
+
+ if (!(registersreturned & EDI)) {
+ data[i++] = 0x5F; // pop edi
+ }
+ if (!(registersreturned & ESI)) {
+ data[i++] = 0x5E; // pop esi
+ }
+ if (!(registersreturned & EBP)) {
+ data[i++] = 0x5D; // pop ebp
+ }
+ if (!(registersreturned & EDX)) {
+ data[i++] = 0x5A; // pop edx
+ }
+ if (!(registersreturned & ECX)) {
+ data[i++] = 0x59; // pop ecx
+ }
+ if (!(registersreturned & EBX)) {
+ data[i++] = 0x5B; // pop ebx
+ }
+ if (!(registersreturned & EAX)) {
+ data[i++] = 0x58; // pop eax
+ }
+
+ data[i++] = 0xC3; // retn
+
+ WriteProcessMemory(GetCurrentProcess(), (LPVOID)address, data, i, 0);
+}
+
+void addhook(int address, int newaddress, int stacksize, int registerargs[], int registersreturned)
+{
+ if (!g_hooktableaddress) {
+ g_hooktableaddress = VirtualAllocEx(GetCurrentProcess(), NULL, g_maxhooks * 100, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
+ }
+ if (g_hooktableoffset > g_maxhooks) {
+ return;
+ }
+ unsigned int hookaddress = (unsigned int)g_hooktableaddress + (g_hooktableoffset * 100);
+ char data[9];
+ int i = 0;
+ data[i++] = 0xEA; // jmp
+ *((int *)&data[i]) = hookaddress; i += 4;
+ data[i++] = 0x23;
+ data[i++] = 0x00;
+ data[i++] = 0xC3; // retn
+ WriteProcessMemory(GetCurrentProcess(), (LPVOID)address, data, i, 0);
+ hookfunc(hookaddress, newaddress, stacksize, registerargs, registersreturned);
+ g_hooktableoffset++;
+}
\ No newline at end of file
diff --git a/src/hook.h b/src/hook.h
new file mode 100644
index 0000000000..ee4ccd3c73
--- /dev/null
+++ b/src/hook.h
@@ -0,0 +1,41 @@
+/*****************************************************************************
+ * Copyright (c) 2014 Ted John
+ * OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
+ *
+ * This file is part of OpenRCT2.
+ *
+ * OpenRCT2 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ *****************************************************************************/
+
+#ifndef _HOOK_H_
+#define _HOOK_H_
+
+extern void* g_hooktableaddress;
+extern int g_hooktableoffset;
+extern int g_maxhooks;
+
+enum REGISTER_ARGS {
+ EAX = 1 << 0,
+ EBX = 1 << 1,
+ ECX = 1 << 2,
+ EDX = 1 << 3,
+ ESI = 1 << 4,
+ EDI = 1 << 5,
+ EBP = 1 << 6,
+ END = 0
+};
+
+void addhook(int address, int newaddress, int stacksize, int registerargs[], int registersreturned);
+
+#endif
\ No newline at end of file