aff4431eea
Moved sm_memtable files in sqlite extension to sdk directory (to be consistent with topmenus) Some extension source files had an incorrect extension name in their headers Updated copyright year on some rarely altered files --HG-- branch : sourcemod-1.0.x extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/branches/sourcemod-1.0.x%402038
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 Team Fortress 2 Extension
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* Copyright (C) 2004-2008 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: $Id$
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*/
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#ifndef _INCLUDE_SOURCEMOD_DETOURS_H_
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#define _INCLUDE_SOURCEMOD_DETOURS_H_
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#if defined PLATFORM_LINUX
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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_LINUX
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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_DETOURS_H_
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