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