| 47 | }; |
| 48 | |
| 49 | struct Restorable |
| 50 | { |
| 51 | Restorable(void *func, const void *code, size_t size) |
| 52 | : func_(func), size_(size), backup_(new uint8_t[size]) |
| 53 | { |
| 54 | memcpy(backup_, func, size); |
| 55 | memcpy_safe(func, code, size); |
| 56 | } |
| 57 | |
| 58 | ~Restorable() |
| 59 | { |
| 60 | memcpy_safe(func_, backup_, size_); |
| 61 | delete[] backup_; |
| 62 | } |
| 63 | |
| 64 | Restorable swap() |
| 65 | { |
| 66 | return Restorable(func_, backup_, size_); |
| 67 | } |
| 68 | |
| 69 | private: |
| 70 | void *func_; |
| 71 | uint8_t *backup_; |
| 72 | size_t size_; |
| 73 | |
| 74 | static bool memcpy_safe(void *dst, const void *src, size_t size) |
| 75 | { |
| 76 | #if OS_WIN |
| 77 | DWORD op; |
| 78 | BOOL success = VirtualProtect(dst, size, PAGE_EXECUTE_READWRITE, &op); |
| 79 | if (success == 0) |
| 80 | return false; |
| 81 | memcpy(dst, src, size); |
| 82 | success = VirtualProtect(dst, size, op, &op); |
| 83 | return success != 0; |
| 84 | #elif OS_MAC |
| 85 | kern_return_t kr; |
| 86 | kr = mach_vm_protect(mach_task_self(), |
| 87 | (mach_vm_address_t)dst, (mach_vm_size_t)size, |
| 88 | FALSE, VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE | VM_PROT_COPY); |
| 89 | if (kr != KERN_SUCCESS) |
| 90 | return false; |
| 91 | |
| 92 | kr = mach_vm_write(mach_task_self(), |
| 93 | (mach_vm_address_t)dst, (vm_offset_t)src, size); |
| 94 | if (kr != KERN_SUCCESS) |
| 95 | return false; |
| 96 | |
| 97 | kr = mach_vm_protect(mach_task_self(), |
| 98 | (mach_vm_address_t)dst, (mach_vm_size_t)size, |
| 99 | FALSE, VM_PROT_READ | VM_PROT_EXECUTE); |
| 100 | return kr == KERN_SUCCESS; |
| 101 | #endif |
| 102 | } |
| 103 | }; |
| 104 | |
| 105 | template <typename> |
| 106 | class Hook; |