Cstrike: Import some memory tools from SourceMod

2014-05-28 00:06:51 +02:00
parent 62cf10f0c3
commit d7b3b47aa4
14 changed files with 2376 additions and 4 deletions
--- a/public/memtools/CDetour/detourhelpers.h
+++ b/public/memtools/CDetour/detourhelpers.h
@@ -0,0 +1,129 @@
+/**
+ * vim: set ts=4 :
+ * =============================================================================
+ * SourceMod
+ * Copyright (C) 2004-2010 AlliedModders LLC.  All rights reserved.
+ * =============================================================================
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, version 3.0, as published by the
+ * Free Software Foundation.
+ * 
+ * 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 <http://www.gnu.org/licenses/>.
+ *
+ * As a special exception, AlliedModders LLC gives you permission to link the
+ * code of this program (as well as its derivative works) to "Half-Life 2," the
+ * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
+ * by the Valve Corporation.  You must obey the GNU General Public License in
+ * all respects for all other code used.  Additionally, AlliedModders LLC grants
+ * this exception to all derivative works.  AlliedModders LLC defines further
+ * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
+ * or <http://www.sourcemod.net/license.php>.
+ *
+ * Version: $Id: detourhelpers.h 248 2008-08-27 00:56:22Z pred $
+ */
+
+#ifndef _INCLUDE_SOURCEMOD_DETOURHELPERS_H_
+#define _INCLUDE_SOURCEMOD_DETOURHELPERS_H_
+
+#if defined(__linux__) || defined(__APPLE__)
+	#include <sys/mman.h>
+	#ifndef PAGE_SIZE
+		#define	PAGE_SIZE	4096
+	#endif
+	#define ALIGN(ar) ((long)ar & ~(PAGE_SIZE-1))
+	#define	PAGE_EXECUTE_READWRITE	PROT_READ|PROT_WRITE|PROT_EXEC
+	#if defined(__linux)
+		#include <malloc.h>
+	#endif
+#elif defined(WIN32)
+	#include <windows.h>
+#endif
+
+struct patch_t
+{
+	patch_t()
+	{
+		patch[0] = 0;
+		bytes = 0;
+	}
+	unsigned char patch[20];
+	size_t bytes;
+};
+
+inline void ProtectMemory(void *addr, int length, int prot)
+{
+#if defined(__linux__) || defined(__APPLE__)
+	void *addr2 = (void *)ALIGN(addr);
+	mprotect(addr2, sysconf(_SC_PAGESIZE), prot);
+#elif defined(WIN32)
+	DWORD old_prot;
+	VirtualProtect(addr, length, prot, &old_prot);
+#endif
+}
+
+inline unsigned char *AllocatePageMemory(size_t size)
+{
+#if defined WIN32
+	return (unsigned char *)VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
+#elif defined __GNUC__
+#if defined __APPLE__
+	unsigned char *addr = (unsigned char *)valloc(size);
+#else
+	unsigned char *addr = (unsigned char *)memalign(sysconf(_SC_PAGESIZE), size);
+#endif
+	mprotect(addr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
+	return addr;
+#endif
+}
+
+inline void FreePageMemory(void *addr)
+{
+#if defined(WIN32)
+	VirtualFree(addr, 0, MEM_RELEASE);
+#else
+	free(addr);
+#endif
+}
+
+inline void SetMemPatchable(void *address, size_t size)
+{
+	ProtectMemory(address, (int)size, PAGE_EXECUTE_READWRITE);
+}
+
+inline void DoGatePatch(unsigned char *target, void *callback)
+{
+	SetMemPatchable(target, 20);
+
+	target[0] = 0xFF;	/* JMP */
+	target[1] = 0x25;	/* MEM32 */
+	*(void **)(&target[2]) = callback;
+}
+
+inline void ApplyPatch(void *address, int offset, const patch_t *patch, patch_t *restore)
+{
+	ProtectMemory(address, 20, PAGE_EXECUTE_READWRITE);
+
+	unsigned char *addr = (unsigned char *)address + offset;
+	if (restore)
+	{
+		for (size_t i=0; i<patch->bytes; i++)
+		{
+			restore->patch[i] = addr[i];
+		}
+		restore->bytes = patch->bytes;
+	}
+
+	for (size_t i=0; i<patch->bytes; i++)
+	{
+		addr[i] = patch->patch[i];
+	}
+}
+
+#endif //_INCLUDE_SOURCEMOD_DETOURHELPERS_H_