source: Daodan/src/Daodan_Patch.c@ 417

Last change on this file since 417 was 351, checked in by rossy, 15 years ago

almost windowed mode
File size: 2.2 KB
Line 
1#include "Daodan_Patch.h"
2#include <windows.h>
3#include <stdlib.h>
4#include <string.h>
5
6bool DDrPatch_MakeJump(void* from, void* to)
7{
8 DWORD oldp;
9
10 if (VirtualProtect(from, 5, PAGE_EXECUTE_READWRITE, &oldp))
11 {
12 *(char*)from++ = 0xe9; // jmp rel32
13 *(int*)from = (unsigned int)to - (unsigned int)from - 4;
14 VirtualProtect(from, 5, oldp, &oldp);
15 return true;
16 }
17 else
18 return false;
19}
20
21bool DDrPatch_MakeCall(void* from, void* to)
22{
23 DWORD oldp;
24
25 if (VirtualProtect(from, 5, PAGE_EXECUTE_READWRITE, &oldp))
26 {
27 *(char*)from++ = 0xe8; // call rel32
28 *(int*)from = (unsigned int)to - (unsigned int)from - 4;
29 VirtualProtect(from, 5, oldp, &oldp);
30 return true;
31 }
32 else
33 return false;
34}
35
36bool DDrPatch_String(char* dest, const char* string, int length)
37{
38 DWORD oldp;
39
40 if (VirtualProtect(dest, length, PAGE_EXECUTE_READWRITE, &oldp))
41 {
42 memcpy(dest, string, length);
43 VirtualProtect(dest, length, oldp, &oldp);
44 return true;
45 }
46 else
47 return false;
48}
49
50bool DDrPatch_Byte(char* dest, char value)
51{
52 DWORD oldp;
53
54 if (VirtualProtect(dest, 1, PAGE_EXECUTE_READWRITE, &oldp))
55 {
56 *dest = value;
57 VirtualProtect(dest, 1, oldp, &oldp);
58 return true;
59 }
60 else
61 return false;
62}
63
64bool DDrPatch_Int32(int* dest, int value)
65{
66 DWORD oldp;
67
68 if (VirtualProtect(dest, 4, PAGE_EXECUTE_READWRITE, &oldp))
69 {
70 *dest = value;
71 VirtualProtect(dest, 4, oldp, &oldp);
72 return true;
73 }
74 else
75 return false;
76}
77
78bool DDrPatch_Int16(short* dest, short value)
79{
80 DWORD oldp;
81
82 if (VirtualProtect(dest, 2, PAGE_EXECUTE_READWRITE, &oldp))
83 {
84 *dest = value;
85 VirtualProtect(dest, 2, oldp, &oldp);
86 return true;
87 }
88 else
89 return false;
90}
91
92bool DDrPatch_StrDup(int* dest, const char* value)
93{
94 DWORD oldp;
95
96 if (VirtualProtect(dest, 4, PAGE_EXECUTE_READWRITE, &oldp))
97 {
98 *dest = (int)strdup(value);
99 VirtualProtect(dest, 4, oldp, &oldp);
100 return true;
101 }
102 else
103 return false;
104}
105
106bool DDrPatch_NOOP(char* dest, unsigned int length)
107{
108 DWORD oldp;
109
110 if (VirtualProtect(dest, length, PAGE_EXECUTE_READWRITE, &oldp))
111 {
112 memset(dest, 0x90, length);
113 VirtualProtect(dest, length, oldp, &oldp);
114 return true;
115 }
116 else
117 return false;
118}
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