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add patch.h for testing

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FunkyFr3sh 2021-06-01 17:35:00 +02:00
parent 061f078f73
commit f262004e13
1 changed files with 55 additions and 0 deletions
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inc/patch.h Normal file
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#ifndef PATCH_H
#define PATCH_H
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
static inline PROC patch_call(char *src, char *dst)
{
DWORD op = PAGE_EXECUTE_READ;
VirtualProtect(src, 5, PAGE_EXECUTE_READWRITE, &op);
src[0] = 0xE8;
DWORD org = *((DWORD *)(&src[1]));
*((DWORD *)(&src[1])) = dst - src - 5;
VirtualProtect(src, 5, op, &op);
return (PROC)(src + 5 + org);
}
static inline void patch_ljmp(char *src, char *dst)
{
DWORD op = PAGE_EXECUTE_READ;
VirtualProtect(src, 5, PAGE_EXECUTE_READWRITE, &op);
src[0] = 0xE9;
*((DWORD *)(&src[1])) = dst - src - 5;
VirtualProtect(src, 5, op, &op);
}
static inline void patch_clear(char *start, char value, char *end)
{
DWORD op = PAGE_EXECUTE_READ;
VirtualProtect(start, end - start, PAGE_EXECUTE_READWRITE, &op);
memset(start, value, end - start);
VirtualProtect(start, end - start, op, &op);
}
static inline DWORD patch_setdword(DWORD *dst, DWORD value)
{
DWORD op = PAGE_EXECUTE_READ;
VirtualProtect(dst, sizeof(DWORD), PAGE_EXECUTE_READWRITE, &op);
DWORD org = *dst;
*dst = value;
VirtualProtect(dst, sizeof(DWORD), op, &op);
return org;
}
static inline void patch_setbytes(char *dst, char *buf, size_t size)
{
DWORD op = PAGE_EXECUTE_READ;
VirtualProtect(dst, size, PAGE_EXECUTE_READWRITE, &op);
memcpy(dst, buf, size);
VirtualProtect(dst, size, op, &op);
}
#define PATCH_SET(a,b) patch_setbytes(a,b,sizeof(b)-1)
#endif