99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/**
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* vim: set ts=4 :
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* =============================================================================
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* SourceMod
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* Copyright (C) 2004-2010 AlliedModders LLC. All rights reserved.
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* =============================================================================
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License, version 3.0, as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* As a special exception, AlliedModders LLC gives you permission to link the
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* code of this program (as well as its derivative works) to "Half-Life 2," the
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* "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
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* by the Valve Corporation. You must obey the GNU General Public License in
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* all respects for all other code used. Additionally, AlliedModders LLC grants
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* this exception to all derivative works. AlliedModders LLC defines further
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* exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
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* or <http://www.sourcemod.net/license.php>.
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*
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* Version: $Id: detourhelpers.h 248 2008-08-27 00:56:22Z pred $
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*/
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#ifndef _INCLUDE_SOURCEMOD_DETOURHELPERS_H_
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#define _INCLUDE_SOURCEMOD_DETOURHELPERS_H_
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#if defined PLATFORM_POSIX
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#include <sys/mman.h>
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#define PAGE_SIZE 4096
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#define ALIGN(ar) ((long)ar & ~(PAGE_SIZE-1))
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#define PAGE_EXECUTE_READWRITE PROT_READ|PROT_WRITE|PROT_EXEC
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#endif
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struct patch_t
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{
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patch_t()
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{
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patch[0] = 0;
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bytes = 0;
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}
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unsigned char patch[20];
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size_t bytes;
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};
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inline void ProtectMemory(void *addr, int length, int prot)
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{
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#if defined PLATFORM_POSIX
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void *addr2 = (void *)ALIGN(addr);
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mprotect(addr2, sysconf(_SC_PAGESIZE), prot);
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#elif defined PLATFORM_WINDOWS
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DWORD old_prot;
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VirtualProtect(addr, length, prot, &old_prot);
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#endif
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}
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inline void SetMemPatchable(void *address, size_t size)
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{
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ProtectMemory(address, (int)size, PAGE_EXECUTE_READWRITE);
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}
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inline void DoGatePatch(unsigned char *target, void *callback)
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{
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SetMemPatchable(target, 20);
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target[0] = 0xFF; /* JMP */
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target[1] = 0x25; /* MEM32 */
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*(void **)(&target[2]) = callback;
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}
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inline void ApplyPatch(void *address, int offset, const patch_t *patch, patch_t *restore)
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{
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ProtectMemory(address, 20, PAGE_EXECUTE_READWRITE);
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unsigned char *addr = (unsigned char *)address + offset;
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if (restore)
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{
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for (size_t i=0; i<patch->bytes; i++)
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{
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restore->patch[i] = addr[i];
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}
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restore->bytes = patch->bytes;
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}
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for (size_t i=0; i<patch->bytes; i++)
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{
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addr[i] = patch->patch[i];
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}
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}
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#endif //_INCLUDE_SOURCEMOD_DETOURHELPERS_H_
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