2011-11-10 07:47:22 +08:00
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/*
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Copyright (C) 2011 de4dot@gmail.com
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This file is part of de4dot.
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de4dot is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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de4dot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System.Collections.Generic;
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using System.Text;
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using System.Text.RegularExpressions;
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2011-12-09 16:02:06 +08:00
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namespace de4dot.code.deobfuscators {
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2011-11-10 07:47:22 +08:00
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static class RandomNameChecker {
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static Regex noUpper = new Regex(@"^[^A-Z]+$");
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static Regex allUpper = new Regex(@"^[A-Z]+$");
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public static bool isNonRandom(string name) {
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if (name.Length < 5)
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return true;
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if (noUpper.IsMatch(name))
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return true;
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if (allUpper.IsMatch(name))
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return true;
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for (int i = 0; i < name.Length - 1; i++) {
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if (isDigit(name[i]))
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return false;
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if (i > 0 && isUpper(name[i]) && isUpper(name[i - 1]))
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return false;
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}
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var words = getCamelWords(name);
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int vowels = 0;
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foreach (var word in words) {
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if (word.Length > 1 && hasVowel(word))
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vowels++;
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}
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switch (words.Count) {
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case 1:
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return vowels == words.Count;
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case 2:
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case 3:
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return vowels >= 1;
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case 4:
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case 5:
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return vowels >= 2;
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case 6:
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return vowels >= 3;
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case 7:
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return vowels >= 4;
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default:
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return vowels >= words.Count - 4;
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}
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}
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static bool hasVowel(string s) {
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foreach (var c in s) {
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switch (c) {
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case 'A':
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case 'a':
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case 'E':
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case 'e':
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case 'I':
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case 'i':
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case 'O':
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case 'o':
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case 'U':
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case 'u':
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case 'Y':
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case 'y':
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return true;
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}
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}
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return false;
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}
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static List<string> getCamelWords(string name) {
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var words = new List<string>();
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var sb = new StringBuilder();
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for (int i = 0; i < name.Length; i++) {
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char c = name[i];
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if (isUpper(c)) {
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if (sb.Length > 0)
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words.Add(sb.ToString());
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sb.Length = 0;
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}
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sb.Append(c);
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}
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if (sb.Length > 0)
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words.Add(sb.ToString());
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return words;
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}
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// Returns true if random, false if unknown
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public static bool isRandom(string name) {
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int len = name.Length;
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if (len < 5)
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return false;
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var typeWords = getTypeWords(name);
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if (countNumbers(typeWords, 2))
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return true;
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int lower, upper, digits;
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countTypeWords(typeWords, out lower, out upper, out digits);
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if (upper >= 3)
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return true;
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bool hasTwoUpperWords = upper == 2;
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foreach (var word in typeWords) {
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if (word.Length > 1 && isDigit(word[0]))
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return true;
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}
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// Check for: lower, digit, lower
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for (int i = 2; i < typeWords.Count; i++) {
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if (isDigit(typeWords[i - 1][0]) && isLower(typeWords[i - 2][0]) && isLower(typeWords[i][0]))
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return true;
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}
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if (hasTwoUpperWords && hasDigit(name))
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return true;
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// Check if it ends in lower, upper, digit
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if (isLower(name[len - 3]) && isUpper(name[len - 2]) && isDigit(name[len - 1]))
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return true;
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return false;
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}
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static bool hasDigit(string s) {
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foreach (var c in s) {
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if (isDigit(c))
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return true;
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}
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return false;
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}
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static List<string> getTypeWords(string s) {
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var words = new List<string>();
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var sb = new StringBuilder();
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for (int i = 0; i < s.Length; ) {
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if (isDigit(s[i])) {
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sb.Length = 0;
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while (i < s.Length && isDigit(s[i]))
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sb.Append(s[i++]);
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words.Add(sb.ToString());
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}
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else if (isUpper(s[i])) {
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sb.Length = 0;
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while (i < s.Length && isUpper(s[i]))
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sb.Append(s[i++]);
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words.Add(sb.ToString());
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}
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else if (isLower(s[i])) {
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sb.Length = 0;
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while (i < s.Length && isLower(s[i]))
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sb.Append(s[i++]);
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words.Add(sb.ToString());
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}
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else {
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sb.Length = 0;
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while (i < s.Length) {
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if (isDigit(s[i]) || isUpper(s[i]) || isLower(s[i]))
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break;
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sb.Append(s[i++]);
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}
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words.Add(sb.ToString());
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}
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}
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return words;
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}
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static bool countNumbers(List<string> words, int numbers) {
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int num = 0;
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foreach (var word in words) {
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if (string.IsNullOrEmpty(word))
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continue;
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if (isDigit(word[0]) && ++num >= numbers)
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return true;
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}
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return false;
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}
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// 2+ chars only
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static void countTypeWords(List<string> words, out int lower, out int upper, out int digits) {
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lower = 0;
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upper = 0;
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digits = 0;
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foreach (var word in words) {
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if (word.Length <= 1)
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continue;
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char c = word[0];
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if (isDigit(c))
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digits++;
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else if (isLower(c))
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lower++;
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else if (isUpper(c))
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upper++;
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}
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}
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static bool isLower(char c) {
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return 'a' <= c && c <= 'z';
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}
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static bool isUpper(char c) {
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return 'A' <= c && c <= 'Z';
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}
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static bool isDigit(char c) {
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return '0' <= c && c <= '9';
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}
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}
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}
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