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SDK/Include/detours.cpp

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+// -----------------------------------------------------------------------------
+// Matthew L (Azorbix)
+// detours.cpp/h
+//
+// Created for Game-Deception
+//
+// Credits:
+//   Dom1n1k
+//   LanceVorgin
+//   P47R!CK
+//
+// Changes by Hans211:
+// - use mlde32 instead of ade32
+// - store length of hook in 1st byte of allocated room
+// - use push xxxx ret as hook instead of jmp
+// - length of detour is optional
+// -----------------------------------------------------------------------------
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <stdlib.h>
+#include "detours.h"
+
+
+int DetourASMlen(BYTE *src, int minlen)			// find out asm instruction length
+{
+	int i,len;
+
+	for (len=0; len<minlen; len+=i) {
+		i=mlde32((void *)src);
+		if (i<=0) return 0;
+		src+=i;
+	}
+	return len;
+}
+
+void *DetourCreate(BYTE *src, const BYTE *dst, int minlen)
+{
+	BYTE	*jmp, *org;
+	DWORD	dwback;
+	DWORD jumpto, newjump;
+	int		len;
+
+	len=DetourASMlen(src,(minlen<6)?6:minlen);
+	if (len==0 && minlen>=6)  len=minlen;
+	if (len==0) return 0;
+
+	org=jmp = (BYTE*)malloc(len+5+1);		// room for nobytes + jmplen + size byte
+    jmp[0]=len;								// save length in first byte
+    jmp++;
+
+VirtualProtect(src,len,PAGE_READWRITE,&dwback);
+
+ if(src[0] == 0xE9)
+ {
+  jmp = (BYTE*)malloc(10);
+  jumpto = (*(DWORD*)(src+1))+((DWORD)src)+5;
+  newjump = (jumpto-(DWORD)(jmp+5));
+  jmp[0] = 0xE9;
+  *(DWORD*)(jmp+1) = newjump;
+  jmp += 5;
+  jmp[0] = 0xE9;
+  *(DWORD*)(jmp+1) = (DWORD)(src-jmp);
+ }
+ else
+ {
+  jmp = (BYTE*)malloc(5+len);
+  memcpy(jmp,src,len);
+  jmp += len;
+  jmp[0] = 0xE9;
+  *(DWORD*)(jmp+1) = (DWORD)(src+len-jmp)-5;
+ }
+ src[0] = 0xE9;
+ *(DWORD*)(src+1) = (DWORD)(dst - src) - 5;
+
+ for(int i = 5; i < len; i++)
+  src[i] = 0x90;
+ VirtualProtect(src,len,dwback,&dwback);
+ return (jmp-len);
+}
+
+// restore == return value of DetourCreate
+void DetourRemove(BYTE *src, BYTE *restore, int len)
+{
+	DWORD dwBack;
+
+	len=*(BYTE *)(restore-1);		// ignore len parameter, only for backward competability
+
+	VirtualProtect(src, len, PAGE_EXECUTE_READWRITE, &dwBack);
+	memcpy(src, restore, len);
+	restore[0] = 0xE9;
+
+	*(DWORD*)(restore+1) = (DWORD)(src - restore) - 5;
+	VirtualProtect(src, len, dwBack, &dwBack);
+}