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https://github.com/FunkyFr3sh/cnc-ddraw.git
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56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
#ifndef PATCH_H
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#define PATCH_H
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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static inline PROC patch_call(char* src, char* dst)
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{
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DWORD op = PAGE_EXECUTE_READ;
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VirtualProtect(src, 5, PAGE_EXECUTE_READWRITE, &op);
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src[0] = 0xE8;
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DWORD org = *((DWORD*)(&src[1]));
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*((DWORD*)(&src[1])) = dst - src - 5;
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VirtualProtect(src, 5, op, &op);
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return (PROC)(src + 5 + org);
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}
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static inline void patch_ljmp(char* src, char* dst)
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{
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DWORD op = PAGE_EXECUTE_READ;
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VirtualProtect(src, 5, PAGE_EXECUTE_READWRITE, &op);
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src[0] = 0xE9;
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*((DWORD*)(&src[1])) = dst - src - 5;
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VirtualProtect(src, 5, op, &op);
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}
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static inline void patch_clear(char* start, char value, char* end)
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{
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DWORD op = PAGE_EXECUTE_READ;
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VirtualProtect(start, end - start, PAGE_EXECUTE_READWRITE, &op);
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memset(start, value, end - start);
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VirtualProtect(start, end - start, op, &op);
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}
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static inline DWORD patch_setdword(DWORD* dst, DWORD value)
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{
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DWORD op = PAGE_EXECUTE_READ;
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VirtualProtect(dst, sizeof(DWORD), PAGE_EXECUTE_READWRITE, &op);
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DWORD org = *dst;
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*dst = value;
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VirtualProtect(dst, sizeof(DWORD), op, &op);
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return org;
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}
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static inline void patch_setbytes(char* dst, char* buf, size_t size)
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{
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DWORD op = PAGE_EXECUTE_READ;
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VirtualProtect(dst, size, PAGE_EXECUTE_READWRITE, &op);
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memcpy(dst, buf, size);
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VirtualProtect(dst, size, op, &op);
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}
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#define PATCH_SET(a,b) patch_setbytes(a,b,sizeof(b)-1)
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#endif
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