goldsrc-cheat/src/include/detour.h

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/**
* @file detour.h
* @brief Detour hooking library header
* @author 8dcc
*
* https://github.com/8dcc/detour-lib
*/
#ifndef DETOUR_H_
#define DETOUR_H_
#ifdef __i386__
typedef uint32_t detour_ptr_t;
#define JMP_SZ_ 7 /* Size of jmp instructions in 32bit */
#else
typedef uint64_t detour_ptr_t;
#define JMP_SZ_ 12 /* Size of jmp instructions in 64bit */
#endif
typedef struct {
bool detoured;
void* orig;
void* hook;
uint8_t jmp_bytes[JMP_SZ_];
uint8_t saved_bytes[JMP_SZ_];
} detour_data_t;
/*----------------------------------------------------------------------------*/
void detour_init(detour_data_t* data, void* orig, void* hook);
bool detour_add(detour_data_t* d);
bool detour_del(detour_data_t* d);
/*----------------------------------------------------------------------------*/
/* Declare the type for the original function */
#define DECL_DETOUR_TYPE(funcRet, newTypeName, ...) \
typedef funcRet (*newTypeName##_t)(__VA_ARGS__);
/* Reset original bytes, call original, detour again.
* Keep in mind that:
* - The returned value of the original function is not stored. If the
* function is not void, and you care about the return value, use
* GET_ORIGINAL() instead.
* - detourData is NOT a pointer, it expects the full struct
* - funcType should be the same name passed to DECL_DETOUR_TYPE, without the
* ending added by the macro ("_t") */
#define CALL_ORIGINAL(detourData, funcType, ...) \
{ \
detour_del(&detourData); \
((funcType##_t)detourData.orig)(__VA_ARGS__); \
detour_add(&detourData); \
}
/* Same as CALL_ORIGINAL, but accepts an extra parameter for storing the
* returned value of the original function */
#define GET_ORIGINAL(detourData, returnVar, funcType, ...) \
{ \
detour_del(&detourData); \
returnVar = ((funcType##_t)detourData.orig)(__VA_ARGS__); \
detour_add(&detourData); \
}
#endif /* DETOUR_H_ */