317 lines
8.4 KiB
C++
317 lines
8.4 KiB
C++
// util/util.cc
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// 8/23/2013 jichi
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// Branch: ITH_Engine/engine.cpp, revision 133
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// See: http://ja.wikipedia.org/wiki/プロジェクト:美少女ゲーム系/ゲームエンジン
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#include "common.h"
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#include "util/util.h"
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#include "ithsys/ithsys.h"
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#include "main.h"
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#include "growl.h"
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namespace { // unnamed
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// jichi 4/19/2014: Return the integer that can mask the signature
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// Artikash 8/4/2018: change implementation
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DWORD SigMask(DWORD sig)
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{
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DWORD count = 0;
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while (sig)
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{
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sig >>= 8;
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++count;
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}
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count -= 4;
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count = -count;
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return 0xffffffff >> (count << 3);
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}
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} // namespace unnamed
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// jichi 8/24/2013: binary search?
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DWORD Util::GetCodeRange(DWORD hModule,DWORD *low, DWORD *high)
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{
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IMAGE_DOS_HEADER *DosHdr;
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IMAGE_NT_HEADERS *NtHdr;
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DWORD dwReadAddr;
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IMAGE_SECTION_HEADER *shdr;
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DosHdr = (IMAGE_DOS_HEADER *)hModule;
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if (IMAGE_DOS_SIGNATURE == DosHdr->e_magic) {
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dwReadAddr = hModule + DosHdr->e_lfanew;
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NtHdr = (IMAGE_NT_HEADERS *)dwReadAddr;
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if (IMAGE_NT_SIGNATURE == NtHdr->Signature) {
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shdr = (PIMAGE_SECTION_HEADER)((DWORD)(&NtHdr->OptionalHeader) + NtHdr->FileHeader.SizeOfOptionalHeader);
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while ((shdr->Characteristics & IMAGE_SCN_CNT_CODE) == 0)
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shdr++;
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*low = hModule + shdr->VirtualAddress;
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*high = *low + (shdr->Misc.VirtualSize & 0xfffff000) + 0x1000;
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}
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}
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return 0;
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}
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DWORD Util::FindCallAndEntryBoth(DWORD fun, DWORD size, DWORD pt, DWORD sig)
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{
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//WCHAR str[0x40];
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enum { reverse_length = 0x800 };
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DWORD t, l;
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DWORD mask = SigMask(sig);
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bool flag2;
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for (DWORD i = 0x1000; i < size-4; i++) {
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bool flag1 = false;
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if (*(BYTE *)(pt + i) == 0xe8) {
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flag1 = flag2 = true;
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t = *(DWORD *)(pt + i + 1);
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} else if (*(WORD *)(pt + i) == 0x15ff) {
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flag1 = true;
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flag2 = false;
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t = *(DWORD *)(pt + i + 2);
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}
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if (flag1) {
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if (flag2) {
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flag1 = (pt + i + 5 + t == fun);
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l = 5;
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} else if (t >= pt && t <= pt + size - 4) {
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flag1 = fun == *(DWORD *)t;
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l = 6;
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} else
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flag1 = false;
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if (flag1)
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//swprintf(str,L"CALL addr: 0x%.8X",pt + i);
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//OutputConsole(str);
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for (DWORD j = i; j > i - reverse_length; j--)
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if ((*(WORD *)(pt + j)) == (sig & mask)) //Fun entry 1.
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//swprintf(str,L"Entry: 0x%.8X",pt + j);
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//OutputConsole(str);
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return pt + j;
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else
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i += l;
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}
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}
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//OutputConsole(L"Find call and entry failed.");
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return 0;
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}
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DWORD Util::FindCallOrJmpRel(DWORD fun, DWORD size, DWORD pt, bool jmp)
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{
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BYTE sig = (jmp) ? 0xe9 : 0xe8;
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for (DWORD i = 0x1000; i < size - 4; i++)
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if (sig == *(BYTE *)(pt + i)) {
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DWORD t = *(DWORD *)(pt + i + 1);
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if(fun == pt + i + 5 + t)
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//OutputDWORD(pt + i);
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return pt + i;
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else
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i += 5;
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}
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return 0;
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}
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DWORD Util::FindCallOrJmpAbs(DWORD fun, DWORD size, DWORD pt, bool jmp)
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{
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WORD sig = jmp ? 0x25ff : 0x15ff;
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for (DWORD i = 0x1000; i < size - 4; i++)
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if (sig == *(WORD *)(pt + i)) {
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DWORD t = *(DWORD *)(pt + i + 2);
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if (t > pt && t < pt + size) {
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if (fun == *(DWORD *)t)
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return pt + i;
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else
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i += 5;
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}
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}
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return 0;
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}
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DWORD Util::FindCallBoth(DWORD fun, DWORD size, DWORD pt)
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{
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for (DWORD i = 0x1000; i < size - 4; i++) {
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if (*(BYTE *)(pt + i) == 0xe8) {
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DWORD t = *(DWORD *)(pt + i + 1) + pt + i + 5;
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if (t == fun)
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return i;
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}
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if (*(WORD *)(pt + i) == 0x15ff) {
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DWORD t = *(DWORD *)(pt + i + 2);
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if (t >= pt && t <= pt + size - 4) {
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if (*(DWORD *)t == fun)
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return i;
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else
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i += 6;
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}
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}
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}
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return 0;
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}
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DWORD Util::FindCallAndEntryAbs(DWORD fun, DWORD size, DWORD pt, DWORD sig)
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{
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//WCHAR str[0x40];
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enum { reverse_length = 0x800 };
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DWORD mask = SigMask(sig);
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for (DWORD i = 0x1000; i < size - 4; i++)
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if (*(WORD *)(pt + i) == 0x15ff) {
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DWORD t = *(DWORD *)(pt + i + 2);
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if (t >= pt && t <= pt + size - 4) {
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if (*(DWORD *)t == fun)
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//swprintf(str,L"CALL addr: 0x%.8X",pt + i);
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//OutputConsole(str);
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for (DWORD j = i ; j > i - reverse_length; j--)
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if ((*(DWORD *)(pt + j) & mask) == sig) // Fun entry 1.
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//swprintf(str,L"Entry: 0x%.8X",pt + j);
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//OutputConsole(str);
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return pt + j;
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} else
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i += 6;
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}
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//OutputConsole(L"Find call and entry failed.");
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return 0;
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}
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DWORD Util::FindCallAndEntryRel(DWORD fun, DWORD size, DWORD pt, DWORD sig)
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{
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//WCHAR str[0x40];
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enum { reverse_length = 0x800 };
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if (DWORD i = FindCallOrJmpRel(fun, size, pt, false)) {
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DWORD mask = SigMask(sig);
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for (DWORD j = i; j > i - reverse_length; j--)
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if (((*(DWORD *)j) & mask) == sig) //Fun entry 1.
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//swprintf(str,L"Entry: 0x%.8X",j);
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//OutputConsole(str);
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return j;
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//OutputConsole(L"Find call and entry failed.");
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}
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return 0;
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}
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bool Util::CheckFile(LPCWSTR name)
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{
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WIN32_FIND_DATAW unused;
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HANDLE file = FindFirstFileW(name, &unused);
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if (file != INVALID_HANDLE_VALUE)
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{
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FindClose(file);
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return true;
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}
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wchar_t path[MAX_PATH * 2];
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wchar_t* end = path + GetModuleFileNameW(nullptr, path, MAX_PATH);
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while (*(--end) != L'\\');
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wcscpy(end + 1, name);
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file = FindFirstFileW(path, &unused);
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if (file != INVALID_HANDLE_VALUE)
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{
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FindClose(file);
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return true;
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}
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return false;
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}
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DWORD Util::FindEntryAligned(DWORD start, DWORD back_range)
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{
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start &= ~0xf;
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for (DWORD i = start, j = start - back_range; i > j; i-=0x10) {
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DWORD k = *(DWORD *)(i-4);
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if (k == 0xcccccccc
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|| k == 0x90909090
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|| k == 0xccccccc3
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|| k == 0x909090c3
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)
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return i;
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DWORD t = k & 0xff0000ff;
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if (t == 0xcc0000c2 || t == 0x900000c2)
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return i;
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k >>= 8;
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if (k == 0xccccc3 || k == 0x9090c3)
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return i;
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t = k & 0xff;
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if (t == 0xc2)
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return i;
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k >>= 8;
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if (k == 0xccc3 || k == 0x90c3)
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return i;
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k >>= 8;
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if (k == 0xc3)
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return i;
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}
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return 0;
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}
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DWORD Util::FindImportEntry(DWORD hModule, DWORD fun)
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{
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IMAGE_DOS_HEADER *DosHdr;
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IMAGE_NT_HEADERS *NtHdr;
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DWORD IAT, end, pt, addr;
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DosHdr = (IMAGE_DOS_HEADER *)hModule;
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if (IMAGE_DOS_SIGNATURE == DosHdr->e_magic) {
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NtHdr = (IMAGE_NT_HEADERS *)(hModule + DosHdr->e_lfanew);
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if (IMAGE_NT_SIGNATURE == NtHdr->Signature) {
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IAT = NtHdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress;
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end = NtHdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].Size;
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IAT += hModule;
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end += IAT;
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for (pt = IAT; pt < end; pt += 4) {
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addr = *(DWORD *)pt;
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if (addr == fun)
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return pt;
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}
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}
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}
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return 0;
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}
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// Search string in rsrc section. This section usually contains version and copyright info.
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bool Util::SearchResourceString(LPCWSTR str)
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{
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DWORD hModule = (DWORD)GetModuleHandleW(nullptr);
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IMAGE_DOS_HEADER *DosHdr;
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IMAGE_NT_HEADERS *NtHdr;
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DosHdr = (IMAGE_DOS_HEADER *)hModule;
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DWORD rsrc, size;
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//__asm int 3
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if (IMAGE_DOS_SIGNATURE == DosHdr->e_magic) {
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NtHdr = (IMAGE_NT_HEADERS *)(hModule + DosHdr->e_lfanew);
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if (IMAGE_NT_SIGNATURE == NtHdr->Signature) {
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rsrc = NtHdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress;
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if (rsrc) {
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rsrc += hModule;
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if (IthGetMemoryRange((LPVOID)rsrc, &rsrc ,&size) &&
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SearchPattern(rsrc, size - 4, str, wcslen(str) << 1))
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return true;
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}
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}
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}
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return false;
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}
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DWORD Util::SearchMemory(const BYTE* bytes, unsigned short length, DWORD protect)
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{
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std::vector<std::pair<DWORD, DWORD>> validMemory;
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for (BYTE* probe = NULL; (DWORD)probe < 0x80000000;) // end of user memory space
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{
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MEMORY_BASIC_INFORMATION info = {};
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if (!VirtualQuery(probe, &info, sizeof(info)))
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{
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probe += 0x1000;
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continue;
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}
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else
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{
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if (info.Protect > protect && !(info.Protect & PAGE_GUARD)) validMemory.push_back({ (DWORD)info.BaseAddress, info.RegionSize });
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probe += info.RegionSize;
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}
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}
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for (auto memory : validMemory)
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// Artikash 7/14/2018: not sure, but I think this could throw read access violation if I dont subtract search_length
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for (int i = 0; i < memory.second - length; ++i)
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for (int j = 0; j <= length; ++j)
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if (j == length) return memory.first + i; // not sure about this algorithm...
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else if (*((BYTE*)memory.first + i + j) != *(bytes + j) && *(bytes + j) != 0x11) break; // 0x11 = wildcard
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return 0;
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}
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// EOF
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