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Cstrike: Import some memory tools from SourceMod

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This commit is contained in:
Arkshine 2014-05-28 00:06:51 +02:00
parent 62cf10f0c3
commit d7b3b47aa4
14 changed files with 2376 additions and 4 deletions
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3
AMBuildScript
View File

@ -225,6 +225,7 @@ class AMXXConfig(object):
'-arch', 'i386',
'-lstdc++',
'-stdlib=libstdc++',
'-framework', 'CoreServices',
]
cfg.cxxflags += ['-stdlib=libstdc++']
elif builder.target_platform == 'windows':
@ -238,7 +239,9 @@ class AMXXConfig(object):
]
cfg.includes += [os.path.join(builder.buildPath, 'includes')]
cfg.includes += [os.path.join(builder.sourcePath, 'public')]
cfg.includes += [os.path.join(builder.sourcePath, 'public', 'amtl')]
cfg.includes += [os.path.join(builder.sourcePath, 'public', 'memtools')]
return
#

3
dlls/cstrike/cstrike/AMBuilder
View File

@ -9,6 +9,9 @@ binary.sources = [
'CstrikePlayer.cpp',
'CstrikeNatives.cpp',
'CstrikeHacks.cpp',
'../../../public/memtools/MemoryUtils.cpp',
'../../../public/memtools/CDetour/detours.cpp',
'../../../public/memtools/CDetour/asm/asm.c',
]
AMXX.modules += [builder.Add(binary)]

6
dlls/cstrike/cstrike/Makefile
View File

@ -14,7 +14,9 @@ MM_ROOT = ../../../../metamod/metamod
PROJECT = cstrike
OBJECTS = sdk/amxxmodule.cpp amxx_api.cpp CstrikePlayer.cpp CstrikeNatives.cpp CstrikeHacks.cpp
OBJECTS = sdk/amxxmodule.cpp amxx_api.cpp CstrikePlayer.cpp CstrikeNatives.cpp CstrikeHacks.cpp \
../../../public/memtools/MemoryUtils.cpp ../../../public/memtools/CDetour/detours.cpp \
../../../public/memtools/CDetour/asm/asm.c
##############################################
### CONFIGURE ANY OTHER FLAGS/OPTIONS HERE ###
@ -29,7 +31,7 @@ CPP_OSX = clang
LINK =
INCLUDE = -I. -I$(HLSDK) -I$(HLSDK)/common -I$(HLSDK)/dlls -I$(HLSDK)/engine -I$(HLSDK)/game_shared \
INCLUDE = -I. -I../../../public -I../../../public/amtl -I$(HLSDK) -I$(HLSDK)/common -I$(HLSDK)/dlls -I$(HLSDK)/engine -I$(HLSDK)/game_shared \
-I$(HLSDK)/public -I$(MM_ROOT) -Isdk
################################################

11
dlls/cstrike/cstrike/msvc10/cstrike.vcxproj
View File

@ -62,7 +62,7 @@
</Midl>
<ClCompile>
<Optimization>Disabled</Optimization>
<AdditionalIncludeDirectories>..\;..\sdk;$(METAMOD)\metamod;$(HLSDK)\common;$(HLSDK)\engine;$(HLSDK)\dlls;$(HLSDK)\pm_shared;$(HLSDK)\public;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\;..\..\..\..\public; ..\..\..\..\public\amtl;..\..\..\..\public\memtools;..\sdk;$(METAMOD)\metamod;$(HLSDK)\common;$(HLSDK)\engine;$(HLSDK)\dlls;$(HLSDK)\pm_shared;$(HLSDK)\public;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;CSTRIKE_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
<RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
@ -105,7 +105,7 @@
<ClCompile>
<Optimization>MaxSpeed</Optimization>
<InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
<AdditionalIncludeDirectories>..\;..\sdk;$(METAMOD)\metamod;$(HLSDK)\common;$(HLSDK)\engine;$(HLSDK)\dlls;$(HLSDK)\pm_shared;$(HLSDK)\public;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\;..\..\..\..\public; ..\..\..\..\public\amtl;..\..\..\..\public\memtools;..\sdk;$(METAMOD)\metamod;$(HLSDK)\common;$(HLSDK)\engine;$(HLSDK)\dlls;$(HLSDK)\pm_shared;$(HLSDK)\public;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;CSTRIKE_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<StringPooling>true</StringPooling>
<RuntimeLibrary>MultiThreaded</RuntimeLibrary>
@ -135,6 +135,9 @@
</Link>
</ItemDefinitionGroup>
<ItemGroup>
<ClCompile Include="..\..\..\..\public\memtools\CDetour\asm\asm.c" />
<ClCompile Include="..\..\..\..\public\memtools\CDetour\detours.cpp" />
<ClCompile Include="..\..\..\..\public\memtools\MemoryUtils.cpp" />
<ClCompile Include="..\amxx_api.cpp" />
<ClCompile Include="..\CstrikeNatives.cpp" />
<ClCompile Include="..\CstrikeHacks.cpp" />
@ -142,6 +145,10 @@
<ClCompile Include="..\sdk\amxxmodule.cpp" />
</ItemGroup>
<ItemGroup>
<ClInclude Include="..\..\..\..\public\memtools\CDetour\asm\asm.h" />
<ClInclude Include="..\..\..\..\public\memtools\CDetour\detourhelpers.h" />
<ClInclude Include="..\..\..\..\public\memtools\CDetour\detours.h" />
<ClInclude Include="..\..\..\..\public\memtools\MemoryUtils.h" />
<ClInclude Include="..\CstrikeDatas.h" />
<ClInclude Include="..\CstrikeNatives.h" />
<ClInclude Include="..\CstrikePlayer.h" />

30
dlls/cstrike/cstrike/msvc10/cstrike.vcxproj.filters
View File

@ -18,6 +18,15 @@
<Filter Include="Pawn Includes">
<UniqueIdentifier>{7be12e0f-47b1-4d7e-880c-83e5d1c378d1}</UniqueIdentifier>
</Filter>
<Filter Include="Memtools">
<UniqueIdentifier>{bbcd1d67-4670-423d-912f-695737e76bad}</UniqueIdentifier>
</Filter>
<Filter Include="Memtools\CDetour">
<UniqueIdentifier>{074d4da1-d1be-40ba-8417-1fc388d85568}</UniqueIdentifier>
</Filter>
<Filter Include="Memtools\CDetour\asm">
<UniqueIdentifier>{4f3c4a13-065a-49b1-83a1-f646a3ec3678}</UniqueIdentifier>
</Filter>
</ItemGroup>
<ItemGroup>
<ClCompile Include="..\CstrikeHacks.cpp">
@ -35,6 +44,15 @@
<ClCompile Include="..\CstrikeNatives.cpp">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\..\..\..\public\memtools\MemoryUtils.cpp">
<Filter>Memtools</Filter>
</ClCompile>
<ClCompile Include="..\..\..\..\public\memtools\CDetour\detours.cpp">
<Filter>Memtools\CDetour</Filter>
</ClCompile>
<ClCompile Include="..\..\..\..\public\memtools\CDetour\asm\asm.c">
<Filter>Memtools\CDetour\asm</Filter>
</ClCompile>
</ItemGroup>
<ItemGroup>
<ClInclude Include="..\CstrikePlayer.h">
@ -55,6 +73,18 @@
<ClInclude Include="..\CstrikeDatas.h">
<Filter>Header Files</Filter>
</ClInclude>
<ClInclude Include="..\..\..\..\public\memtools\MemoryUtils.h">
<Filter>Memtools</Filter>
</ClInclude>
<ClInclude Include="..\..\..\..\public\memtools\CDetour\detourhelpers.h">
<Filter>Memtools\CDetour</Filter>
</ClInclude>
<ClInclude Include="..\..\..\..\public\memtools\CDetour\detours.h">
<Filter>Memtools\CDetour</Filter>
</ClInclude>
<ClInclude Include="..\..\..\..\public\memtools\CDetour\asm\asm.h">
<Filter>Memtools\CDetour\asm</Filter>
</ClInclude>
</ItemGroup>
<ItemGroup>
<None Include="..\..\..\plugins\include\cstrike.inc">

419
public/memtools/CDetour/asm/asm.c Normal file
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@ -0,0 +1,419 @@
#include "asm.h"
#ifndef WIN32
#define _GNU_SOURCE
#include <dlfcn.h>
#include <string.h>
#define REG_EAX 0
#define REG_ECX 1
#define REG_EDX 2
#define REG_EBX 3
#define IA32_MOV_REG_IMM 0xB8 // encoding is +r <imm32>
#endif
/**
* Checks if a call to a fpic thunk has just been written into dest.
* If found replaces it with a direct mov that sets the required register to the value of pc.
*
* @param dest Destination buffer where a call opcode + addr (5 bytes) has just been written.
* @param pc The program counter value that needs to be set (usually the next address from the source).
* @noreturn
*/
void check_thunks(unsigned char *dest, unsigned char *pc)
{
#if defined WIN32
return;
#else
/* Step write address back 4 to the start of the function address */
unsigned char *writeaddr = dest - 4;
unsigned char *calloffset = *(unsigned char **)writeaddr;
unsigned char *calladdr = (unsigned char *)(dest + (unsigned int)calloffset);
/* Lookup name of function being called */
if ((*calladdr == 0x8B) && (*(calladdr+2) == 0x24) && (*(calladdr+3) == 0xC3))
{
//a thunk maybe?
char movByte = IA32_MOV_REG_IMM;
/* Calculate the correct mov opcode */
switch (*(calladdr+1))
{
case 0x04:
{
movByte += REG_EAX;
break;
}
case 0x1C:
{
movByte += REG_EBX;
break;
}
case 0x0C:
{
movByte += REG_ECX;
break;
}
case 0x14:
{
movByte += REG_EDX;
break;
}
default:
{
//Msg("Unknown thunk: %c\n", *(calladdr+1));
break;
}
}
/* Move our write address back one to where the call opcode was */
writeaddr--;
/* Write our mov */
*writeaddr = movByte;
writeaddr++;
/* Write the value - The provided program counter value */
*(void **)writeaddr = (void *)pc;
writeaddr += 4;
}
return;
#endif
}
//if dest is NULL, returns minimum number of bytes needed to be copied
//if dest is not NULL, it will copy the bytes to dest as well as fix CALLs and JMPs
//http://www.devmaster.net/forums/showthread.php?t=2311
int copy_bytes(unsigned char *func, unsigned char* dest, int required_len) {
int bytecount = 0;
while(bytecount < required_len && *func != 0xCC)
{
// prefixes F0h, F2h, F3h, 66h, 67h, D8h-DFh, 2Eh, 36h, 3Eh, 26h, 64h and 65h
int operandSize = 4;
int FPU = 0;
int twoByte = 0;
unsigned char opcode = 0x90;
unsigned char modRM = 0xFF;
while(*func == 0xF0 ||
*func == 0xF2 ||
*func == 0xF3 ||
(*func & 0xFC) == 0x64 ||
(*func & 0xF8) == 0xD8 ||
(*func & 0x7E) == 0x62)
{
if(*func == 0x66)
{
operandSize = 2;
}
else if((*func & 0xF8) == 0xD8)
{
FPU = *func;
if (dest)
*dest++ = *func++;
else
func++;
bytecount++;
break;
}
if (dest)
*dest++ = *func++;
else
func++;
bytecount++;
}
// two-byte opcode byte
if(*func == 0x0F)
{
twoByte = 1;
if (dest)
*dest++ = *func++;
else
func++;
bytecount++;
}
// opcode byte
opcode = *func++;
if (dest) *dest++ = opcode;
bytecount++;
// mod R/M byte
modRM = 0xFF;
if(FPU)
{
if((opcode & 0xC0) != 0xC0)
{
modRM = opcode;
}
}
else if(!twoByte)
{
if((opcode & 0xC4) == 0x00 ||
((opcode & 0xF4) == 0x60 && ((opcode & 0x0A) == 0x02 || (opcode & 0x09) == 0x09)) ||
(opcode & 0xF0) == 0x80 ||
((opcode & 0xF8) == 0xC0 && (opcode & 0x0E) != 0x02) ||
(opcode & 0xFC) == 0xD0 ||
(opcode & 0xF6) == 0xF6)
{
modRM = *func++;
if (dest) *dest++ = modRM;
bytecount++;
}
}
else
{
if(((opcode & 0xF0) == 0x00 && (opcode & 0x0F) >= 0x04 && (opcode & 0x0D) != 0x0D) ||
(opcode & 0xF0) == 0x30 ||
opcode == 0x77 ||
(opcode & 0xF0) == 0x80 ||
((opcode & 0xF0) == 0xA0 && (opcode & 0x07) <= 0x02) ||
(opcode & 0xF8) == 0xC8)
{
// No mod R/M byte
}
else
{
modRM = *func++;
if (dest) *dest++ = modRM;
bytecount++;
}
}
// SIB
if((modRM & 0x07) == 0x04 &&
(modRM & 0xC0) != 0xC0)
{
if (dest)
*dest++ = *func++; //SIB
else
func++;
bytecount++;
}
// mod R/M displacement
// Dword displacement, no base
if((modRM & 0xC5) == 0x05) {
if (dest) {
*(unsigned int*)dest = *(unsigned int*)func;
dest += 4;
}
func += 4;
bytecount += 4;
}
// Byte displacement
if((modRM & 0xC0) == 0x40) {
if (dest)
*dest++ = *func++;
else
func++;
bytecount++;
}
// Dword displacement
if((modRM & 0xC0) == 0x80) {
if (dest) {
*(unsigned int*)dest = *(unsigned int*)func;
dest += 4;
}
func += 4;
bytecount += 4;
}
// immediate
if(FPU)
{
// Can't have immediate operand
}
else if(!twoByte)
{
if((opcode & 0xC7) == 0x04 ||
(opcode & 0xFE) == 0x6A || // PUSH/POP/IMUL
(opcode & 0xF0) == 0x70 || // Jcc
opcode == 0x80 ||
opcode == 0x83 ||
(opcode & 0xFD) == 0xA0 || // MOV
opcode == 0xA8 || // TEST
(opcode & 0xF8) == 0xB0 || // MOV
(opcode & 0xFE) == 0xC0 || // RCL
opcode == 0xC6 || // MOV
opcode == 0xCD || // INT
(opcode & 0xFE) == 0xD4 || // AAD/AAM
(opcode & 0xF8) == 0xE0 || // LOOP/JCXZ
opcode == 0xEB ||
(opcode == 0xF6 && (modRM & 0x30) == 0x00)) // TEST
{
if (dest)
*dest++ = *func++;
else
func++;
bytecount++;
}
else if((opcode & 0xF7) == 0xC2) // RET
{
if (dest) {
*(unsigned short*)dest = *(unsigned short*)func;
dest += 2;
}
func += 2;
bytecount += 2;
}
else if((opcode & 0xFC) == 0x80 ||
(opcode & 0xC7) == 0x05 ||
(opcode & 0xF8) == 0xB8 ||
(opcode & 0xFE) == 0xE8 || // CALL/Jcc
(opcode & 0xFE) == 0x68 ||
(opcode & 0xFC) == 0xA0 ||
(opcode & 0xEE) == 0xA8 ||
opcode == 0xC7 ||
(opcode == 0xF7 && (modRM & 0x30) == 0x00))
{
if (dest) {
//Fix CALL/JMP offset
if ((opcode & 0xFE) == 0xE8) {
if (operandSize == 4)
{
*(long*)dest = ((func + *(long*)func) - dest);
//pRED* edit. func is the current address of the call address, +4 is the next instruction, so the value of $pc
check_thunks(dest+4, func+4);
}
else
*(short*)dest = ((func + *(short*)func) - dest);
} else {
if (operandSize == 4)
*(unsigned long*)dest = *(unsigned long*)func;
else
*(unsigned short*)dest = *(unsigned short*)func;
}
dest += operandSize;
}
func += operandSize;
bytecount += operandSize;
}
}
else
{
if(opcode == 0xBA || // BT
opcode == 0x0F || // 3DNow!
(opcode & 0xFC) == 0x70 || // PSLLW
(opcode & 0xF7) == 0xA4 || // SHLD
opcode == 0xC2 ||
opcode == 0xC4 ||
opcode == 0xC5 ||
opcode == 0xC6)
{
if (dest)
*dest++ = *func++;
else
func++;
}
else if((opcode & 0xF0) == 0x80) // Jcc -i
{
if (dest) {
if (operandSize == 4)
*(unsigned long*)dest = *(unsigned long*)func;
else
*(unsigned short*)dest = *(unsigned short*)func;
dest += operandSize;
}
func += operandSize;
bytecount += operandSize;
}
}
}
return bytecount;
}
//insert a specific JMP instruction at the given location
void inject_jmp(void* src, void* dest) {
*(unsigned char*)src = OP_JMP;
*(long*)((unsigned char*)src+1) = (long)((unsigned char*)dest - ((unsigned char*)src + OP_JMP_SIZE));
}
//fill a given block with NOPs
void fill_nop(void* src, unsigned int len) {
unsigned char* src2 = (unsigned char*)src;
while (len) {
*src2++ = OP_NOP;
--len;
}
}
void* eval_jump(void* src) {
unsigned char* addr = (unsigned char*)src;
if (!addr) return 0;
//import table jump
if (addr[0] == OP_PREFIX && addr[1] == OP_JMP_SEG) {
addr += 2;
addr = *(unsigned char**)addr;
//TODO: if addr points into the IAT
return *(void**)addr;
}
//8bit offset
else if (addr[0] == OP_JMP_BYTE) {
addr = &addr[OP_JMP_BYTE_SIZE] + *(char*)&addr[1];
//mangled 32bit jump?
if (addr[0] == OP_JMP) {
addr = addr + *(int*)&addr[1];
}
return addr;
}
/*
//32bit offset
else if (addr[0] == OP_JMP) {
addr = &addr[OP_JMP_SIZE] + *(int*)&addr[1];
}
*/
return addr;
}
/*
from ms detours package
static bool detour_is_imported(PBYTE pbCode, PBYTE pbAddress)
{
MEMORY_BASIC_INFORMATION mbi;
VirtualQuery((PVOID)pbCode, &mbi, sizeof(mbi));
__try {
PIMAGE_DOS_HEADER pDosHeader = (PIMAGE_DOS_HEADER)mbi.AllocationBase;
if (pDosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
return false;
}
PIMAGE_NT_HEADERS pNtHeader = (PIMAGE_NT_HEADERS)((PBYTE)pDosHeader +
pDosHeader->e_lfanew);
if (pNtHeader->Signature != IMAGE_NT_SIGNATURE) {
return false;
}
if (pbAddress >= ((PBYTE)pDosHeader +
pNtHeader->OptionalHeader
.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress) &&
pbAddress < ((PBYTE)pDosHeader +
pNtHeader->OptionalHeader
.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress +
pNtHeader->OptionalHeader
.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].Size)) {
return true;
}
return false;
}
__except(EXCEPTION_EXECUTE_HANDLER) {
return false;
}
}
*/

40
public/memtools/CDetour/asm/asm.h Normal file
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@ -0,0 +1,40 @@
#ifndef __ASM_H__
#define __ASM_H__
#define OP_JMP 0xE9
#define OP_JMP_SIZE 5
#define OP_NOP 0x90
#define OP_NOP_SIZE 1
#define OP_PREFIX 0xFF
#define OP_JMP_SEG 0x25
#define OP_JMP_BYTE 0xEB
#define OP_JMP_BYTE_SIZE 2
#ifdef __cplusplus
extern "C" {
#endif
void check_thunks(unsigned char *dest, unsigned char *pc);
//if dest is NULL, returns minimum number of bytes needed to be copied
//if dest is not NULL, it will copy the bytes to dest as well as fix CALLs and JMPs
//http://www.devmaster.net/forums/showthread.php?t=2311
int copy_bytes(unsigned char *func, unsigned char* dest, int required_len);
//insert a specific JMP instruction at the given location
void inject_jmp(void* src, void* dest);
//fill a given block with NOPs
void fill_nop(void* src, unsigned int len);
//evaluate a JMP at the target
void* eval_jump(void* src);
#ifdef __cplusplus
}
#endif
#endif //__ASM_H__

129
public/memtools/CDetour/detourhelpers.h Normal file
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@ -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_

231
public/memtools/CDetour/detours.cpp Normal file
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@ -0,0 +1,231 @@
/**
* 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: detours.cpp 248 2008-08-27 00:56:22Z pred $
*/
#include "detours.h"
#include "asm/asm.h"
//ISourcePawnEngine *CDetourManager::spengine = NULL;
//IGameConfig *CDetourManager::gameconf = NULL;
void CDetourManager::Init(/*ISourcePawnEngine *spengine, IGameConfig *gameconf*/)
{
//CDetourManager::spengine = spengine;
//CDetourManager::gameconf = gameconf;
}
CDetour *CDetourManager::CreateDetour(void *callbackfunction, void **trampoline, const char *signame)
{
CDetour *detour = new CDetour(callbackfunction, trampoline, signame);
if (detour)
{
if (!detour->Init(/*spengine, gameconf*/))
{
delete detour;
return NULL;
}
return detour;
}
return NULL;
}
CDetour *CDetourManager::CreateDetour(void *callbackfunction, void **trampoline, void *address)
{
CDetour *detour = new CDetour(callbackfunction, trampoline, address);
if (detour)
{
if (!detour->Init(/*spengine, gameconf*/))
{
delete detour;
return NULL;
}
return detour;
}
return NULL;
}
CDetour::CDetour(void *callbackfunction, void **trampoline, const char *signame)
{
enabled = false;
detoured = false;
detour_address = NULL;
detour_trampoline = NULL;
this->signame = signame;
this->detour_callback = callbackfunction;
this->address = NULL;
//spengine = NULL;
//gameconf = NULL;
this->trampoline = trampoline;
}
CDetour::CDetour(void *callbackfunction, void **trampoline, void *address)
{
enabled = false;
detoured = false;
detour_address = address;
detour_trampoline = NULL;
this->signame = NULL;
this->detour_callback = callbackfunction;
this->address = address;
//spengine = NULL;
//gameconf = NULL;
this->trampoline = trampoline;
}
bool CDetour::Init(/*ISourcePawnEngine *spengine, IGameConfig *gameconf*/)
{
//this->spengine = spengine;
//this->gameconf = gameconf;
if (!CreateDetour())
{
enabled = false;
return enabled;
}
enabled = true;
return enabled;
}
void CDetour::Destroy()
{
DeleteDetour();
delete this;
}
bool CDetour::IsEnabled()
{
return enabled;
}
bool CDetour::CreateDetour()
{
/*if (signame != NULL && !gameconf->GetMemSig(signame, &detour_address))
{
g_pSM->LogError(myself, "Could not locate %s - Disabling detour", signame);
return false;
}*/
if (address != NULL)
{
detour_address = address;
}
if (!detour_address)
{
//g_pSM->LogError(myself, "Sigscan for %s failed - Disabling detour to prevent crashes", signame);
return false;
}
detour_restore.bytes = copy_bytes((unsigned char *)detour_address, NULL, OP_JMP_SIZE+1);
/* First, save restore bits */
for (size_t i=0; i<detour_restore.bytes; i++)
{
detour_restore.patch[i] = ((unsigned char *)detour_address)[i];
}
JitWriter wr;
JitWriter *jit = &wr;
unsigned int CodeSize = 0;
wr.outbase = NULL;
wr.outptr = NULL;
jit_rewind:
/* Patch old bytes in */
if (wr.outbase != NULL)
{
copy_bytes((unsigned char *)detour_address, (unsigned char*)wr.outptr, detour_restore.bytes);
}
wr.outptr += detour_restore.bytes;
/* Return to the original function */
unsigned int call = IA32_Jump_Imm32(jit, 0);
IA32_Write_Jump32_Abs(jit, call, (unsigned char *)detour_address + detour_restore.bytes);
if (wr.outbase == NULL)
{
CodeSize = wr.get_outputpos();
wr.outbase = (char *)AllocatePageMemory(CodeSize);
//spengine->SetReadWrite(wr.outbase);
wr.outptr = wr.outbase;
detour_trampoline = wr.outbase;
goto jit_rewind;
}
//spengine->SetReadExecute(wr.outbase);
*trampoline = detour_trampoline;
return true;
}
void CDetour::DeleteDetour()
{
if (detoured)
{
DisableDetour();
}
if (detour_trampoline)
{
/* Free the allocated trampoline memory */
FreePageMemory(detour_trampoline);
detour_trampoline = NULL;
}
}
void CDetour::EnableDetour()
{
if (!detoured)
{
DoGatePatch((unsigned char *)detour_address, &detour_callback);
detoured = true;
}
}
void CDetour::DisableDetour()
{
if (detoured)
{
/* Remove the patch */
ApplyPatch(detour_address, 0, &detour_restore, NULL);
detoured = false;
}
}

361
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/**
* 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: detours.h 257 2008-09-23 03:12:13Z pred $
*/
#ifndef _INCLUDE_SOURCEMOD_DETOURS_H_
#define _INCLUDE_SOURCEMOD_DETOURS_H_
#include "amxxmodule.h"
//#include <jit/jit_helpers.h>
//#include <jit/x86/x86_macros.h>
#include "detourhelpers.h"
/**
* CDetours class for SourceMod Extensions by pRED*
* detourhelpers.h entirely stolen from CSS:DM and were written by BAILOPAN (I assume).
* asm.h/c from devmaster.net (thanks cybermind) edited by pRED* to handle gcc -fPIC thunks correctly
* Concept by Nephyrin Zey (http://www.doublezen.net/) and Windows Detour Library (http://research.microsoft.com/sn/detours/)
* Member function pointer ideas by Don Clugston (http://www.codeproject.com/cpp/FastDelegate.asp)
*/
#define DETOUR_MEMBER_CALL(name) (this->*name##_Actual)
#define DETOUR_STATIC_CALL(name) (name##_Actual)
#define DETOUR_DECL_STATIC0(name, ret) \
ret (*name##_Actual)(void) = NULL; \
ret name(void)
#define DETOUR_DECL_STATIC1(name, ret, p1type, p1name) \
ret (*name##_Actual)(p1type) = NULL; \
ret name(p1type p1name)
#define DETOUR_DECL_STATIC4(name, ret, p1type, p1name, p2type, p2name, p3type, p3name, p4type, p4name) \
ret (*name##_Actual)(p1type, p2type, p3type, p4type) = NULL; \
ret name(p1type p1name, p2type p2name, p3type p3name, p4type p4name)
#define DETOUR_DECL_MEMBER0(name, ret) \
class name##Class \
{ \
public: \
ret name(); \
static ret (name##Class::* name##_Actual)(void); \
}; \
ret (name##Class::* name##Class::name##_Actual)(void) = NULL; \
ret name##Class::name()
#define DETOUR_DECL_MEMBER1(name, ret, p1type, p1name) \
class name##Class \
{ \
public: \
ret name(p1type p1name); \
static ret (name##Class::* name##_Actual)(p1type); \
}; \
ret (name##Class::* name##Class::name##_Actual)(p1type) = NULL; \
ret name##Class::name(p1type p1name)
#define DETOUR_DECL_MEMBER2(name, ret, p1type, p1name, p2type, p2name) \
class name##Class \
{ \
public: \
ret name(p1type p1name, p2type p2name); \
static ret (name##Class::* name##_Actual)(p1type, p2type); \
}; \
ret (name##Class::* name##Class::name##_Actual)(p1type, p2type) = NULL; \
ret name##Class::name(p1type p1name, p2type p2name)
#define DETOUR_DECL_MEMBER3(name, ret, p1type, p1name, p2type, p2name, p3type, p3name) \
class name##Class \
{ \
public: \
ret name(p1type p1name, p2type p2name, p3type p3name); \
static ret (name##Class::* name##_Actual)(p1type, p2type, p3type); \
}; \
ret (name##Class::* name##Class::name##_Actual)(p1type, p2type, p3type) = NULL; \
ret name##Class::name(p1type p1name, p2type p2name, p3type p3name)
#define DETOUR_DECL_MEMBER4(name, ret, p1type, p1name, p2type, p2name, p3type, p3name, p4type, p4name) \
class name##Class \
{ \
public: \
ret name(p1type p1name, p2type p2name, p3type p3name, p4type p4name); \
static ret (name##Class::* name##_Actual)(p1type, p2type, p3type, p4type); \
}; \
ret (name##Class::* name##Class::name##_Actual)(p1type, p2type, p3type, p4type) = NULL; \
ret name##Class::name(p1type p1name, p2type p2name, p3type p3name, p4type p4name)
#define DETOUR_DECL_MEMBER8(name, ret, p1type, p1name, p2type, p2name, p3type, p3name, p4type, p4name, p5type, p5name, p6type, p6name, p7type, p7name, p8type, p8name) \
class name##Class \
{ \
public: \
ret name(p1type p1name, p2type p2name, p3type p3name, p4type p4name, p5type p5name, p6type p6name, p7type p7name, p8type p8name); \
static ret (name##Class::* name##_Actual)(p1type, p2type, p3type, p4type, p5type, p6type, p7type, p8type); \
}; \
ret (name##Class::* name##Class::name##_Actual)(p1type, p2type, p3type, p4type, p5type, p6type, p7type, p8type) = NULL; \
ret name##Class::name(p1type p1name, p2type p2name, p3type p3name, p4type p4name, p5type p5name, p6type p6name, p7type p7name, p8type p8name)
#define GET_MEMBER_CALLBACK(name) (void *)GetCodeAddress(&name##Class::name)
#define GET_MEMBER_TRAMPOLINE(name) (void **)(&name##Class::name##_Actual)
#define GET_STATIC_CALLBACK(name) (void *)&name
#define GET_STATIC_TRAMPOLINE(name) (void **)&name##_Actual
#define DETOUR_CREATE_MEMBER(name, gamedata, target) CDetourManager::CreateDetour(GET_MEMBER_CALLBACK(name), GET_MEMBER_TRAMPOLINE(name), gamedata, target);
#define DETOUR_CREATE_STATIC(name, gamedata, target) CDetourManager::CreateDetour(GET_STATIC_CALLBACK(name), GET_STATIC_TRAMPOLINE(name), gamedata, target);
#define DETOUR_CREATE_STATIC_FIXED(name, address) CDetourManager::CreateDetour(GET_STATIC_CALLBACK(name), GET_STATIC_TRAMPOLINE(name), address);
class GenericClass {};
typedef void (GenericClass::*VoidFunc)();
inline void *GetCodeAddr(VoidFunc mfp)
{
return *(void **)&mfp;
}
/**
* Converts a member function pointer to a void pointer.
* This relies on the assumption that the code address lies at mfp+0
* This is the case for both g++ and later MSVC versions on non virtual functions but may be different for other compilers
* Based on research by Don Clugston : http://www.codeproject.com/cpp/FastDelegate.asp
*/
#define GetCodeAddress(mfp) GetCodeAddr(reinterpret_cast<VoidFunc>(mfp))
class CDetourManager;
class CDetour
{
public:
bool IsEnabled();
/**
* These would be somewhat self-explanatory I hope
*/
void EnableDetour();
void DisableDetour();
void Destroy();
friend class CDetourManager;
protected:
CDetour(void *callbackfunction, void **trampoline, const char *signame);
CDetour(void *callbackfunction, void **trampoline, void *address);
bool Init();
private:
/* These create/delete the allocated memory */
bool CreateDetour();
void DeleteDetour();
bool enabled;
bool detoured;
patch_t detour_restore;
/* Address of the detoured function */
void *detour_address;
/* Address of the allocated trampoline function */
void *detour_trampoline;
/* Address of the callback handler */
void *detour_callback;
/* The function pointer used to call our trampoline */
void **trampoline;
const char *signame;
void *address;
};
class CDetourManager
{
public:
static void Init();
/**
* Creates a new detour
*
* @param callbackfunction Void pointer to your detour callback function.
* @param trampoline Address of the trampoline pointer
* @param signame Section name containing a signature to fetch from the gamedata file.
* @return A new CDetour pointer to control your detour.
*
* Example:
*
* CBaseServer::ConnectClient(netadr_s &, int, int, int, char const*, char const*, char const*, int)
*
* Define a new class with the required function and a member function pointer to the same type:
*
* class CBaseServerDetour
* {
* public:
* bool ConnectClient(void *netaddr_s, int, int, int, char const*, char const*, char const*, int);
* static bool (CBaseServerDetour::* ConnectClient_Actual)(void *netaddr_s, int, int, int, char const*, char const*, char const*, int);
* }
*
* void *callbackfunc = GetCodeAddress(&CBaseServerDetour::ConnectClient);
* void **trampoline = (void **)(&CBaseServerDetour::ConnectClient_Actual);
*
* Creation:
* CDetourManager::CreateDetour(callbackfunc, trampoline, "ConnectClient");
*
* Usage:
*
* CBaseServerDetour::ConnectClient(void *netaddr_s, int, int, int, char const*, char const*, char const*, int)
* {
* //pre hook code
* bool result = (this->*ConnectClient_Actual)(netaddr_s, rest of params);
* //post hook code
* return result;
* }
*
* Note we changed the netadr_s reference into a void* to avoid needing to define the type
*/
static CDetour *CreateDetour(void *callbackfunction, void **trampoline, const char *signame);
static CDetour *CreateDetour(void *callbackfunction, void **trampoline, void *address);
friend class CBlocker;
friend class CDetour;
/*private:
static ISourcePawnEngine *spengine;
static IGameConfig *gameconf;*/
};
// Helpers from jit_helpers.h/x86_macros.h.
class JitWriter
{
public:
inline cell read_cell()
{
cell val = *(inptr);
inptr++;
return val;
}
inline cell peek_cell()
{
return *inptr;
}
inline cell *read_cellptr()
{
cell *val = *(cell **)(inptr);
inptr++;
return val;
}
inline void write_ubyte(unsigned char c)
{
if (outbase)
{
*outptr = c;
}
outptr++;
}
inline void write_ushort(unsigned short c)
{
if (outbase)
{
*(unsigned short *)outptr = c;
}
outptr += sizeof(unsigned short);
}
inline void write_byte(char c)
{
if (outbase)
{
*outptr = c;
}
outptr++;
}
inline void write_int32(int c)
{
if (outbase)
{
*(int *)outptr = c;
}
outptr += sizeof(int);
}
inline void write_uint32(unsigned int c)
{
if (outbase)
{
*(unsigned int *)outptr = c;
}
outptr += sizeof(unsigned int);
}
inline unsigned int get_outputpos()
{
return (outptr - outbase);
}
inline void set_outputpos(unsigned int offs)
{
outptr = outbase + offs;
}
inline unsigned int get_inputpos()
{
return (unsigned int)((char *)inptr - (char *)inbase);
}
public:
cell *inptr; /* input pointer */
cell *inbase; /* input base */
char *outbase; /* output pointer */
char *outptr; /* output base */
};
#define IA32_JMP_IMM32 0xE9 // encoding is imm32
inline unsigned int IA32_Jump_Imm32(JitWriter *jit, int disp)
{
unsigned int ptr;
jit->write_ubyte(IA32_JMP_IMM32);
ptr = jit->get_outputpos();
jit->write_int32(disp);
return ptr;
}
/**
* Corrects a jump using an absolute offset, not a relative one.
*/
inline void IA32_Write_Jump32_Abs(JitWriter *jit, unsigned int jmp, void *target)
{
//save old ptr
char *oldptr = jit->outptr;
//get relative difference
long diff = ((long)target - ((long)jit->outbase + jmp + 4));
//overwrite old value
jit->outptr = jit->outbase + jmp;
jit->write_int32(diff);
//restore old ptr
jit->outptr = oldptr;
}
#endif // _INCLUDE_SOURCEMOD_DETOURS_H_

657
public/memtools/MemoryUtils.cpp Normal file
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/**
* vim: set ts=4 sw=4 tw=99 noet :
* =============================================================================
* SourceMod
* Copyright (C) 2004-2011 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>.
*/
#include "MemoryUtils.h"
#include <string.h>
#if defined(__linux__)
#include <fcntl.h>
#include <link.h>
#include <sys/mman.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#define PAGE_SIZE 4096
#define PAGE_ALIGN_UP(x) ((x + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1))
#endif
#if defined(__APPLE__)
#include <AvailabilityMacros.h>
#include <mach/task.h>
#include <mach-o/dyld_images.h>
#include <mach-o/loader.h>
#include <mach-o/nlist.h>
#include <dlfcn.h>
/* Define things from 10.6 SDK for older SDKs */
#ifndef MAC_OS_X_VERSION_10_6
struct task_dyld_info
{
mach_vm_address_t all_image_info_addr;
mach_vm_size_t all_image_info_size;
};
typedef struct task_dyld_info task_dyld_info_data_t;
#define TASK_DYLD_INFO 17
#define TASK_DYLD_INFO_COUNT (sizeof(task_dyld_info_data_t) / sizeof(natural_t))
#endif // MAC_OS_X_VERSION_10_6
#endif // __APPLE__
MemoryUtils g_MemUtils;
MemoryUtils::MemoryUtils()
{
#if defined(__APPLE__)
Gestalt(gestaltSystemVersionMajor, &m_OSXMajor);
Gestalt(gestaltSystemVersionMinor, &m_OSXMinor);
/* Get pointer to struct that describes all loaded mach-o images in process */
if ((m_OSXMajor == 10 && m_OSXMinor >= 6) || m_OSXMajor > 10)
{
task_dyld_info_data_t dyld_info;
mach_msg_type_number_t count = TASK_DYLD_INFO_COUNT;
task_info(mach_task_self(), TASK_DYLD_INFO, (task_info_t)&dyld_info, &count);
m_ImageList = (struct dyld_all_image_infos *)dyld_info.all_image_info_addr;
}
else
{
struct nlist list[2];
memset(list, 0, sizeof(list));
list[0].n_un.n_name = (char *)"_dyld_all_image_infos";
nlist("/usr/lib/dyld", list);
m_ImageList = (struct dyld_all_image_infos *)list[0].n_value;
}
#endif
}
MemoryUtils::~MemoryUtils()
{
#if defined(__linux__) || defined(__APPLE__)
for (size_t i = 0; i < m_SymTables.length(); i++)
{
delete m_SymTables[i];
}
m_SymTables.clear();
#endif
}
void *MemoryUtils::FindPattern(const void *libPtr, const char *pattern, size_t len)
{
DynLibInfo lib;
bool found;
char *ptr, *end;
memset(&lib, 0, sizeof(DynLibInfo));
if (!GetLibraryInfo(libPtr, lib))
{
return NULL;
}
ptr = reinterpret_cast<char *>(lib.baseAddress);
end = ptr + lib.memorySize - len;
while (ptr < end)
{
found = true;
for (register size_t i = 0; i < len; i++)
{
if (pattern[i] != '\x2A' && pattern[i] != ptr[i])
{
found = false;
break;
}
}
if (found)
return ptr;
ptr++;
}
return NULL;
}
void *MemoryUtils::ResolveSymbol(void *handle, const char *symbol)
{
#if defined(WIN32)
return GetProcAddress((HMODULE)handle, symbol);
#elif defined(__linux__)
struct link_map *dlmap;
struct stat dlstat;
int dlfile;
uintptr_t map_base;
Elf32_Ehdr *file_hdr;
Elf32_Shdr *sections, *shstrtab_hdr, *symtab_hdr, *strtab_hdr;
Elf32_Sym *symtab;
const char *shstrtab, *strtab;
uint16_t section_count;
uint32_t symbol_count;
LibSymbolTable *libtable;
SymbolTable *table;
Symbol *symbol_entry;
dlmap = (struct link_map *)handle;
symtab_hdr = NULL;
strtab_hdr = NULL;
table = NULL;
/* See if we already have a symbol table for this library */
for (size_t i = 0; i < m_SymTables.length(); i++)
{
libtable = m_SymTables[i];
if (libtable->lib_base == dlmap->l_addr)
{
table = &libtable->table;
break;
}
}
/* If we don't have a symbol table for this library, then create one */
if (table == NULL)
{
libtable = new LibSymbolTable();
libtable->table.Initialize();
libtable->lib_base = dlmap->l_addr;
libtable->last_pos = 0;
table = &libtable->table;
m_SymTables.append(libtable);
}
/* See if the symbol is already cached in our table */
symbol_entry = table->FindSymbol(symbol, strlen(symbol));
if (symbol_entry != NULL)
{
return symbol_entry->address;
}
/* If symbol isn't in our table, then we have open the actual library */
dlfile = open(dlmap->l_name, O_RDONLY);
if (dlfile == -1 || fstat(dlfile, &dlstat) == -1)
{
close(dlfile);
return NULL;
}
/* Map library file into memory */
file_hdr = (Elf32_Ehdr *)mmap(NULL, dlstat.st_size, PROT_READ, MAP_PRIVATE, dlfile, 0);
map_base = (uintptr_t)file_hdr;
if (file_hdr == MAP_FAILED)
{
close(dlfile);
return NULL;
}
close(dlfile);
if (file_hdr->e_shoff == 0 || file_hdr->e_shstrndx == SHN_UNDEF)
{
munmap(file_hdr, dlstat.st_size);
return NULL;
}
sections = (Elf32_Shdr *)(map_base + file_hdr->e_shoff);
section_count = file_hdr->e_shnum;
/* Get ELF section header string table */
shstrtab_hdr = &sections[file_hdr->e_shstrndx];
shstrtab = (const char *)(map_base + shstrtab_hdr->sh_offset);
/* Iterate sections while looking for ELF symbol table and string table */
for (uint16_t i = 0; i < section_count; i++)
{
Elf32_Shdr &hdr = sections[i];
const char *section_name = shstrtab + hdr.sh_name;
if (strcmp(section_name, ".symtab") == 0)
{
symtab_hdr = &hdr;
}
else if (strcmp(section_name, ".strtab") == 0)
{
strtab_hdr = &hdr;
}
}
/* Uh oh, we don't have a symbol table or a string table */
if (symtab_hdr == NULL || strtab_hdr == NULL)
{
munmap(file_hdr, dlstat.st_size);
return NULL;
}
symtab = (Elf32_Sym *)(map_base + symtab_hdr->sh_offset);
strtab = (const char *)(map_base + strtab_hdr->sh_offset);
symbol_count = symtab_hdr->sh_size / symtab_hdr->sh_entsize;
/* Iterate symbol table starting from the position we were at last time */
for (uint32_t i = libtable->last_pos; i < symbol_count; i++)
{
Elf32_Sym &sym = symtab[i];
unsigned char sym_type = ELF32_ST_TYPE(sym.st_info);
const char *sym_name = strtab + sym.st_name;
Symbol *cur_sym;
/* Skip symbols that are undefined or do not refer to functions or objects */
if (sym.st_shndx == SHN_UNDEF || (sym_type != STT_FUNC && sym_type != STT_OBJECT))
{
continue;
}
/* Caching symbols as we go along */
cur_sym = table->InternSymbol(sym_name, strlen(sym_name), (void *)(dlmap->l_addr + sym.st_value));
if (strcmp(symbol, sym_name) == 0)
{
symbol_entry = cur_sym;
libtable->last_pos = ++i;
break;
}
}
munmap(file_hdr, dlstat.st_size);
return symbol_entry ? symbol_entry->address : NULL;
#elif defined(__APPLE__)
uintptr_t dlbase, linkedit_addr;
uint32_t image_count;
struct mach_header *file_hdr;
struct load_command *loadcmds;
struct segment_command *linkedit_hdr;
struct symtab_command *symtab_hdr;
struct nlist *symtab;
const char *strtab;
uint32_t loadcmd_count;
uint32_t symbol_count;
LibSymbolTable *libtable;
SymbolTable *table;
Symbol *symbol_entry;
dlbase = 0;
image_count = m_ImageList->infoArrayCount;
linkedit_hdr = NULL;
symtab_hdr = NULL;
table = NULL;
/* Loop through mach-o images in process.
* We can skip index 0 since that is just the executable.
*/
for (uint32_t i = 1; i < image_count; i++)
{
const struct dyld_image_info &info = m_ImageList->infoArray[i];
/* "Load" each one until we get a matching handle */
void *h = dlopen(info.imageFilePath, RTLD_NOLOAD);
if (h == handle)
{
dlbase = (uintptr_t)info.imageLoadAddress;
dlclose(h);
break;
}
dlclose(h);
}
if (!dlbase)
{
/* Uh oh, we couldn't find a matching handle */
return NULL;
}
/* See if we already have a symbol table for this library */
for (size_t i = 0; i < m_SymTables.length(); i++)
{
libtable = m_SymTables[i];
if (libtable->lib_base == dlbase)
{
table = &libtable->table;
break;
}
}
/* If we don't have a symbol table for this library, then create one */
if (table == NULL)
{
libtable = new LibSymbolTable();
libtable->table.Initialize();
libtable->lib_base = dlbase;
libtable->last_pos = 0;
table = &libtable->table;
m_SymTables.append(libtable);
}
/* See if the symbol is already cached in our table */
symbol_entry = table->FindSymbol(symbol, strlen(symbol));
if (symbol_entry != NULL)
{
return symbol_entry->address;
}
/* If symbol isn't in our table, then we have to locate it in memory */
file_hdr = (struct mach_header *)dlbase;
loadcmds = (struct load_command *)(dlbase + sizeof(struct mach_header));
loadcmd_count = file_hdr->ncmds;
/* Loop through load commands until we find the ones for the symbol table */
for (uint32_t i = 0; i < loadcmd_count; i++)
{
if (loadcmds->cmd == LC_SEGMENT && !linkedit_hdr)
{
struct segment_command *seg = (struct segment_command *)loadcmds;
if (strcmp(seg->segname, "__LINKEDIT") == 0)
{
linkedit_hdr = seg;
if (symtab_hdr)
{
break;
}
}
}
else if (loadcmds->cmd == LC_SYMTAB)
{
symtab_hdr = (struct symtab_command *)loadcmds;
if (linkedit_hdr)
{
break;
}
}
/* Load commands are not of a fixed size which is why we add the size */
loadcmds = (struct load_command *)((uintptr_t)loadcmds + loadcmds->cmdsize);
}
if (!linkedit_hdr || !symtab_hdr || !symtab_hdr->symoff || !symtab_hdr->stroff)
{
/* Uh oh, no symbol table */
return NULL;
}
linkedit_addr = dlbase + linkedit_hdr->vmaddr;
symtab = (struct nlist *)(linkedit_addr + symtab_hdr->symoff - linkedit_hdr->fileoff);
strtab = (const char *)(linkedit_addr + symtab_hdr->stroff - linkedit_hdr->fileoff);
symbol_count = symtab_hdr->nsyms;
/* Iterate symbol table starting from the position we were at last time */
for (uint32_t i = libtable->last_pos; i < symbol_count; i++)
{
struct nlist &sym = symtab[i];
/* Ignore the prepended underscore on all symbols, so +1 here */
const char *sym_name = strtab + sym.n_un.n_strx + 1;
Symbol *cur_sym;
/* Skip symbols that are undefined */
if (sym.n_sect == NO_SECT)
{
continue;
}
/* Caching symbols as we go along */
cur_sym = table->InternSymbol(sym_name, strlen(sym_name), (void *)(dlbase + sym.n_value));
if (strcmp(symbol, sym_name) == 0)
{
symbol_entry = cur_sym;
libtable->last_pos = ++i;
break;
}
}
return symbol_entry ? symbol_entry->address : NULL;
#endif
}
bool MemoryUtils::GetLibraryInfo(const void *libPtr, DynLibInfo &lib)
{
uintptr_t baseAddr;
if (libPtr == NULL)
{
return false;
}
#if defined(WIN32)
MEMORY_BASIC_INFORMATION info;
IMAGE_DOS_HEADER *dos;
IMAGE_NT_HEADERS *pe;
IMAGE_FILE_HEADER *file;
IMAGE_OPTIONAL_HEADER *opt;
if (!VirtualQuery(libPtr, &info, sizeof(MEMORY_BASIC_INFORMATION)))
{
return false;
}
baseAddr = reinterpret_cast<uintptr_t>(info.AllocationBase);
/* All this is for our insane sanity checks :o */
dos = reinterpret_cast<IMAGE_DOS_HEADER *>(baseAddr);
pe = reinterpret_cast<IMAGE_NT_HEADERS *>(baseAddr + dos->e_lfanew);
file = &pe->FileHeader;
opt = &pe->OptionalHeader;
/* Check PE magic and signature */
if (dos->e_magic != IMAGE_DOS_SIGNATURE || pe->Signature != IMAGE_NT_SIGNATURE || opt->Magic != IMAGE_NT_OPTIONAL_HDR32_MAGIC)
{
return false;
}
/* Check architecture, which is 32-bit/x86 right now
* Should change this for 64-bit if Valve gets their act together
*/
if (file->Machine != IMAGE_FILE_MACHINE_I386)
{
return false;
}
/* For our purposes, this must be a dynamic library */
if ((file->Characteristics & IMAGE_FILE_DLL) == 0)
{
return false;
}
/* Finally, we can do this */
lib.memorySize = opt->SizeOfImage;
#elif defined(__linux__)
Dl_info info;
Elf32_Ehdr *file;
Elf32_Phdr *phdr;
uint16_t phdrCount;
if (!dladdr(libPtr, &info))
{
return false;
}
if (!info.dli_fbase || !info.dli_fname)
{
return false;
}
/* This is for our insane sanity checks :o */
baseAddr = reinterpret_cast<uintptr_t>(info.dli_fbase);
file = reinterpret_cast<Elf32_Ehdr *>(baseAddr);
/* Check ELF magic */
if (memcmp(ELFMAG, file->e_ident, SELFMAG) != 0)
{
return false;
}
/* Check ELF version */
if (file->e_ident[EI_VERSION] != EV_CURRENT)
{
return false;
}
/* Check ELF architecture, which is 32-bit/x86 right now
* Should change this for 64-bit if Valve gets their act together
*/
if (file->e_ident[EI_CLASS] != ELFCLASS32 || file->e_machine != EM_386 || file->e_ident[EI_DATA] != ELFDATA2LSB)
{
return false;
}
/* For our purposes, this must be a dynamic library/shared object */
if (file->e_type != ET_DYN)
{
return false;
}
phdrCount = file->e_phnum;
phdr = reinterpret_cast<Elf32_Phdr *>(baseAddr + file->e_phoff);
for (uint16_t i = 0; i < phdrCount; i++)
{
Elf32_Phdr &hdr = phdr[i];
/* We only really care about the segment with executable code */
if (hdr.p_type == PT_LOAD && hdr.p_flags == (PF_X|PF_R))
{
/* From glibc, elf/dl-load.c:
* c->mapend = ((ph->p_vaddr + ph->p_filesz + GLRO(dl_pagesize) - 1)
* & ~(GLRO(dl_pagesize) - 1));
*
* In glibc, the segment file size is aligned up to the nearest page size and
* added to the virtual address of the segment. We just want the size here.
*/
lib.memorySize = PAGE_ALIGN_UP(hdr.p_filesz);
break;
}
}
#elif defined(__APPLE__)
Dl_info info;
struct mach_header *file;
struct segment_command *seg;
uint32_t cmd_count;
if (!dladdr(libPtr, &info))
{
return false;
}
if (!info.dli_fbase || !info.dli_fname)
{
return false;
}
/* This is for our insane sanity checks :o */
baseAddr = (uintptr_t)info.dli_fbase;
file = (struct mach_header *)baseAddr;
/* Check Mach-O magic */
if (file->magic != MH_MAGIC)
{
return false;
}
/* Check architecture (32-bit/x86) */
if (file->cputype != CPU_TYPE_I386 || file->cpusubtype != CPU_SUBTYPE_I386_ALL)
{
return false;
}
/* For our purposes, this must be a dynamic library */
if (file->filetype != MH_DYLIB)
{
return false;
}
cmd_count = file->ncmds;
seg = (struct segment_command *)(baseAddr + sizeof(struct mach_header));
/* Add up memory sizes of mapped segments */
for (uint32_t i = 0; i < cmd_count; i++)
{
if (seg->cmd == LC_SEGMENT)
{
lib.memorySize += seg->vmsize;
}
seg = (struct segment_command *)((uintptr_t)seg + seg->cmdsize);
}
#endif
lib.baseAddress = reinterpret_cast<void *>(baseAddr);
return true;
}
bool MemoryUtils::GetLibraryOfAddress(const void *libPtr, char *buffer, size_t maxlength, uintptr_t *base)
{
#if defined(__linux__) || defined(__APPLE__)
Dl_info info;
if (!dladdr(libPtr, &info))
{
return false;
}
if (!info.dli_fbase || !info.dli_fname)
{
return false;
}
const char *dllpath = info.dli_fname;
snprintf(buffer, maxlength, "%s", dllpath);
if (base)
{
*base = (uintptr_t)info.dli_fbase;
}
#else
MEMORY_BASIC_INFORMATION mem;
if (!VirtualQuery(libPtr, &mem, sizeof(mem)))
{
return false;
}
if (mem.AllocationBase == NULL)
{
return false;
}
HMODULE dll = (HMODULE)mem.AllocationBase;
GetModuleFileName(dll, (LPTSTR)buffer, maxlength);
if (base)
{
*base = (uintptr_t)mem.AllocationBase;
}
#endif
return true;
}

89
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/**
* vim: set ts=4 sw=4 tw=99 noet :
* =============================================================================
* SourceMod
* Copyright (C) 2004-2011 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>.
*/
#ifndef _INCLUDE_SOURCEMOD_MEMORYUTILS_H_
#define _INCLUDE_SOURCEMOD_MEMORYUTILS_H_
#if defined(__linux__) || defined(__APPLE__)
#include <stdint.h>
#include <am-vector.h>
#include <sm_symtable.h>
#endif
#if defined(__APPLE__)
#include <CoreServices/CoreServices.h>
#endif
#if defined(WIN32)
#include <windows.h>
#endif
struct DynLibInfo
{
void *baseAddress;
size_t memorySize;
};
#if defined(__linux__) || defined(__APPLE__)
struct LibSymbolTable
{
SymbolTable table;
uintptr_t lib_base;
uint32_t last_pos;
};
#endif
class MemoryUtils
{
public:
MemoryUtils();
~MemoryUtils();
public:
void *FindPattern(const void *libPtr, const char *pattern, size_t len);
void *ResolveSymbol(void *handle, const char *symbol);
public:
bool GetLibraryInfo(const void *libPtr, DynLibInfo &lib);
bool GetLibraryOfAddress(const void *libPtr, char *buffer, size_t maxlength, uintptr_t *base);
#if defined(__linux__) || defined(__APPLE__)
private:
ke::Vector<LibSymbolTable *> m_SymTables;
#if defined(__APPLE__)
struct dyld_all_image_infos *m_ImageList;
SInt32 m_OSXMajor;
SInt32 m_OSXMinor;
#endif // __APPLE__
#endif
};
extern MemoryUtils g_MemUtils;
#endif // _INCLUDE_SOURCEMOD_MEMORYUTILS_H_

170
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/**
* vim: set ts=4 sw=4 tw=99 noet :
* =============================================================================
* SourceMod
* Copyright (C) 2004-2008 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: $Id$
*/
#ifndef _INCLUDE_SOURCEMOD_CORE_STRINGTABLE_H_
#define _INCLUDE_SOURCEMOD_CORE_STRINGTABLE_H_
#include <stdlib.h>
#include <string.h>
class BaseMemTable
{
public:
BaseMemTable(unsigned int init_size)
{
membase = (unsigned char *)malloc(init_size);
size = init_size;
tail = 0;
}
~BaseMemTable()
{
free(membase);
membase = NULL;
}
public:
/**
* Allocates 'size' bytes of memory.
* Optionally outputs the address through 'addr'.
* Returns an index >= 0 on success, < 0 on failure.
*/
int CreateMem(unsigned int addsize, void **addr)
{
int idx = (int)tail;
while (tail + addsize >= size) {
size *= 2;
membase = (unsigned char *)realloc(membase, size);
}
tail += addsize;
if (addr)
*addr = (void *)&membase[idx];
return idx;
}
/**
* Given an index into the memory table, returns its address.
* Returns NULL if invalid.
*/
void *GetAddress(int index)
{
if (index < 0 || (unsigned int)index >= tail)
return NULL;
return &membase[index];
}
/**
* Scraps the memory table. For caching purposes, the memory
* is not freed, however subsequent calls to CreateMem() will
* begin at the first index again.
*/
void Reset()
{
tail = 0;
}
inline unsigned int GetMemUsage()
{
return size;
}
inline unsigned int GetActualMemUsed()
{
return tail;
}
private:
unsigned char *membase;
unsigned int size;
unsigned int tail;
};
class BaseStringTable
{
public:
BaseStringTable(unsigned int init_size) : m_table(init_size)
{
}
public:
/**
* Adds a string to the string table and returns its index.
*/
int AddString(const char *string)
{
return AddString(string, strlen(string));
}
/**
* Adds a string to the string table and returns its index.
*/
int AddString(const char *string, size_t length)
{
size_t len = length + 1;
int idx;
char *addr;
idx = m_table.CreateMem(len, (void **)&addr);
memcpy(addr, string, length + 1);
return idx;
}
/**
* Given an index into the string table, returns the associated string.
*/
inline const char *GetString(int str)
{
return (const char *)m_table.GetAddress(str);
}
/**
* Scraps the string table. For caching purposes, the memory
* is not freed, however subsequent calls to AddString() will
* begin at the first index again.
*/
void Reset()
{
m_table.Reset();
}
/**
* Returns the parent BaseMemTable that this string table uses.
*/
inline BaseMemTable *GetMemTable()
{
return &m_table;
}
private:
BaseMemTable m_table;
};
#endif //_INCLUDE_SOURCEMOD_CORE_STRINGTABLE_H_

231
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/**
* vim: set ts=4 sw=4 tw=99 noet :
* =============================================================================
* SourceMod
* Copyright (C) 2004-2009 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>.
*/
#ifndef _INCLUDE_SOURCEMOD_CORE_SYMBOLTABLE_H_
#define _INCLUDE_SOURCEMOD_CORE_SYMBOLTABLE_H_
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#define KESTRING_TABLE_START_SIZE 65536
struct Symbol
{
size_t length;
uint32_t hash;
void *address;
Symbol *tbl_next;
inline char *buffer()
{
return reinterpret_cast<char *>(this + 1);
}
};
class SymbolTable
{
public:
~SymbolTable()
{
for (uint32_t i = 0; i < nbuckets; i++)
{
Symbol *sym = buckets[i];
while (sym != NULL)
{
Symbol *next = sym->tbl_next;
free(sym);
sym = next;
}
}
free(buckets);
}
bool Initialize()
{
buckets = (Symbol **)malloc(sizeof(Symbol *) * KESTRING_TABLE_START_SIZE);
if (buckets == NULL)
{
return false;
}
memset(buckets, 0, sizeof(Symbol *) * KESTRING_TABLE_START_SIZE);
nbuckets = KESTRING_TABLE_START_SIZE;
nused = 0;
bucketmask = KESTRING_TABLE_START_SIZE - 1;
return true;
}
static inline uint32_t HashString(const char *data, size_t len)
{
#undef get16bits
#if (defined(__GNUC__) && defined(__i386__)) || defined(__WATCOMC__) \
|| defined(_MSC_VER) || defined (__BORLANDC__) || defined (__TURBOC__)
#define get16bits(d) (*((const uint16_t *) (d)))
#endif
#if !defined (get16bits)
#define get16bits(d) ((((uint32_t)(((const uint8_t *)(d))[1])) << 8)\
+(uint32_t)(((const uint8_t *)(d))[0]) )
#endif
uint32_t hash = len, tmp;
int rem;
if (len <= 0 || data == NULL)
{
return 0;
}
rem = len & 3;
len >>= 2;
/* Main loop */
for (;len > 0; len--) {
hash += get16bits (data);
tmp = (get16bits (data+2) << 11) ^ hash;
hash = (hash << 16) ^ tmp;
data += 2 * sizeof (uint16_t);
hash += hash >> 11;
}
/* Handle end cases */
switch (rem) {
case 3: hash += get16bits (data);
hash ^= hash << 16;
hash ^= data[sizeof (uint16_t)] << 18;
hash += hash >> 11;
break;
case 2: hash += get16bits (data);
hash ^= hash << 11;
hash += hash >> 17;
break;
case 1: hash += *data;
hash ^= hash << 10;
hash += hash >> 1;
}
/* Force "avalanching" of final 127 bits */
hash ^= hash << 3;
hash += hash >> 5;
hash ^= hash << 4;
hash += hash >> 17;
hash ^= hash << 25;
hash += hash >> 6;
return hash;
#undef get16bits
}
Symbol **FindSymbolBucket(const char *str, size_t len, uint32_t hash)
{
uint32_t bucket = hash & bucketmask;
Symbol **pkvs = &buckets[bucket];
Symbol *kvs = *pkvs;
while (kvs != NULL)
{
if (len == kvs->length && memcmp(str, kvs->buffer(), len * sizeof(char)) == 0)
{
return pkvs;
}
pkvs = &kvs->tbl_next;
kvs = *pkvs;
}
return pkvs;
}
void ResizeSymbolTable()
{
uint32_t xnbuckets = nbuckets * 2;
Symbol **xbuckets = (Symbol **)malloc(sizeof(Symbol *) * xnbuckets);
if (xbuckets == NULL)
{
return;
}
memset(xbuckets, 0, sizeof(Symbol *) * xnbuckets);
uint32_t xbucketmask = xnbuckets - 1;
for (uint32_t i = 0; i < nbuckets; i++)
{
Symbol *sym = buckets[i];
while (sym != NULL)
{
Symbol *next = sym->tbl_next;
uint32_t bucket = sym->hash & xbucketmask;
sym->tbl_next = xbuckets[bucket];
xbuckets[bucket] = sym;
sym = next;
}
}
free(buckets);
buckets = xbuckets;
nbuckets = xnbuckets;
bucketmask = xbucketmask;
}
Symbol *FindSymbol(const char *str, size_t len)
{
uint32_t hash = HashString(str, len);
Symbol **pkvs = FindSymbolBucket(str, len, hash);
return *pkvs;
}
Symbol *InternSymbol(const char* str, size_t len, void *address)
{
uint32_t hash = HashString(str, len);
Symbol **pkvs = FindSymbolBucket(str, len, hash);
if (*pkvs != NULL)
{
return *pkvs;
}
Symbol *kvs = (Symbol *)malloc(sizeof(Symbol) + sizeof(char) * (len + 1));
kvs->length = len;
kvs->hash = hash;
kvs->address = address;
kvs->tbl_next = NULL;
memcpy(kvs + 1, str, sizeof(char) * (len + 1));
*pkvs = kvs;
nused++;
if (nused > nbuckets && nbuckets <= INT_MAX / 2)
{
ResizeSymbolTable();
}
return kvs;
}
private:
uint32_t nbuckets;
uint32_t nused;
uint32_t bucketmask;
Symbol **buckets;
};
#endif //_INCLUDE_SOURCEMOD_CORE_SYMBOLTABLE_H_