Javaソースコード難読化ツール自作入門 – 第３回

//（前略）
#define iLenInputFilePath	500
#define iMaxLinesInFile		(10 * 1000)
#define iMaxLettersInLine	(10 * 1000)

int iNumOfDecFunc = 0;
char szDecFuncDef[iMaxLinesInFile][iMaxLettersInLine];

void obfConstInLine(char *szLine);
//（中略）

int main(int argc, char **argv) {
	//（中略）
	srand((unsigned int)time(NULL));
	char szLine[iMaxLettersInLine];
	while (fgets(szLine, iMaxLettersInLine, fp)) {
		obfConstInLine(szLine);
	}
	//（中略）
}

bool bInComment = false;
void obfConstInLine(char *szLine) {
	if (*szLine == '\n') {
		printf("%s", szLine);
		return;
	}
	if (bIsClassEnd(szLine)) {
		injectDecFuncDef();
		printf("%s", szLine);
		return;
	}

	int iLenLine = strlen(szLine);
	for (int i = 0; i < iLenLine; i++) {
		//skip comment
		char *pcPlaceInSzLine = pcSkipIfComment(&szLine[i]);
		i += (pcPlaceInSzLine - &szLine[i]);

		//skip single quotation
		pcPlaceInSzLine = pcSkipIfSingleQuotation(&szLine[i]);
		i += (pcPlaceInSzLine - &szLine[i]);

		//skip stirng literal
		pcPlaceInSzLine = pcSkipIfStringLiteral(&szLine[i]);
		i += (pcPlaceInSzLine - &szLine[i]);

		//skip case n:
		if (i) {
			if (bIsCase(&szLine[i])) {
				break;
			}
		}

		//find and obf const
		if (!i) {
		} else if (bIsNumChr(szLine[i]) && bIsSeparator(szLine[i - 1])) {
			char szConst[iMaxLettersInLine];
			pcGetFirstSeparatedElement(&szLine[i], szConst);
			if (bIsIntNum(szConst)) {
				int iConst = (int)strtol(szConst, NULL, 0);
				
				char szFuncCall[100];
				int iRand, iCorrectionVal;
				makeDecFuncCall(iConst, szFuncCall, &iRand, &iCorrectionVal);
				makeDecFuncDef(iCorrectionVal);
				printf("//dec: %d\n", iRand - iCorrectionVal);

				char *pcPlaceInSzLine2 = szReplace(&szLine[i], szConst, szFuncCall);
				i += (pcPlaceInSzLine2 - &szLine[i]);
			} else {
				i += (pcFindSeparator(&szLine[i]) - &szLine[i]);
			}
		}
	}
	printf("%s", szLine);
}
//（後略）

public class test {
	public static void main(String[] args) {
		hoge();
	}

	static void hoge() {
		int iA = 0;
		iA = 1 - 2 - -5;	//= 1 - 2 + 5
		iA = 1 - 2 - - -5;	/*= 1 - 2 - 5*/ iA = 10;

		char chA = '\"'; String strA = "1234\n";
		switch (iA) {
			case 10:
				System.out.println("iA = 10");
				break;
			default:
				System.out.println("iA = ?");
		}
	}
}

public class test {
	public static void main(String[] args) {
		hoge();
	}

	static void hoge() {
//dec: 0
		int iA = func0000(530090);
//dec: 1
//dec: 2
//dec: 5
		iA = func0001(166900) - func0002(331909) - -func0003(492950);	//= 1 - 2 + 5
//dec: 1
//dec: 2
//dec: 5
//dec: 10
		iA = func0004(894684) - func0005(975861) - - -func0006(550598);	/*= 1 - 2 - 5*/ iA = func0007(839692);

		char chA = '\"'; String strA = "1234\n";
		switch (iA) {
			case 10:
				System.out.println("iA = 10");
				break;
			default:
				System.out.println("iA = ?");
		}
	}

	static int func0000(int iRand) {
		return iRand - 530090;
	}
	//（中略）
	static int func0007(int iRand) {
		return iRand - 839682;
	}
}