LegacyConsoleArchive/jpexs-decompiler
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remove obfuscated unused variables

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[email protected]
2015-10-19 10:22:29 +02:00
parent b45d67014c
commit c7a9c0f824
1 changed files with 57 additions and 0 deletions
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libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/action/deobfuscation/ActionDeobfuscatorSimpleFast.java
+57
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@@ -57,6 +57,7 @@ import com.jpexs.decompiler.flash.action.swf5.ActionBitRShift;
import com.jpexs.decompiler.flash.action.swf5.ActionBitURShift;
import com.jpexs.decompiler.flash.action.swf5.ActionBitXor;
import com.jpexs.decompiler.flash.action.swf5.ActionDecrement;
import com.jpexs.decompiler.flash.action.swf5.ActionDefineLocal;
import com.jpexs.decompiler.flash.action.swf5.ActionEquals2;
import com.jpexs.decompiler.flash.action.swf5.ActionIncrement;
import com.jpexs.decompiler.flash.action.swf5.ActionLess2;
@@ -73,7 +74,9 @@ import com.jpexs.decompiler.graph.Graph;
import com.jpexs.decompiler.graph.GraphTargetItem;
import com.jpexs.decompiler.graph.TranslateStack;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
*
@@ -91,6 +94,7 @@ public class ActionDeobfuscatorSimpleFast implements SWFDecompilerListener {
while (changed) {
changed = removeGetTimes(fastActions);
changed |= removeObfuscationIfs(fastActions);
changed |= removeObfuscatedUnusedVariables(fastActions);
}
actions.setActions(fastActions.toActionList());
@@ -216,6 +220,59 @@ public class ActionDeobfuscatorSimpleFast implements SWFDecompilerListener {
return ret;
}
private boolean removeObfuscatedUnusedVariables(FastActionList actions) throws InterruptedException {
if (actions.isEmpty()) {
return false;
}
Map<String, Integer> pushValues = getPushValues(actions);
boolean ret = false;
// Push, Push DefineLocal => remove when first pushed value is obfuscated and never used
FastActionListIterator iterator = actions.iterator();
while (iterator.hasNext()) {
Action a = iterator.next().action;
Action a1 = iterator.peek(0).action;
Action a2 = iterator.peek(1).action;
if (a instanceof ActionPush && a1 instanceof ActionPush && a2 instanceof ActionDefineLocal) {
ActionPush pushName = (ActionPush) a;
ActionPush pushValue = (ActionPush) a1;
if (pushName.values.size() == 1 && pushValue.values.size() == 1) {
String strName = EcmaScript.toString(pushName.values.get(0), pushName.constantPool);
if (isFakeName(strName) && pushValues.get(strName) == 1) {
iterator.remove(); // Push name
iterator.next();
iterator.remove(); // Push value
iterator.next();
iterator.remove(); // DefineLocal
ret = true;
}
}
}
}
return ret;
}
private Map<String, Integer> getPushValues(FastActionList actions) {
Map<String, Integer> ret = new HashMap<>();
for (ActionItem actionItem : actions) {
Action action = actionItem.action;
if (action instanceof ActionPush) {
ActionPush push = (ActionPush) action;
for (int i = 0; i < push.values.size(); i++) {
String str = EcmaScript.toString(push.values.get(i), push.constantPool);
Integer cnt = ret.get(str);
cnt = cnt == null ? 1 : cnt + 1;
ret.put(str, cnt);
}
}
}
return ret;
}
protected boolean isFakeName(String name) {
for (char ch : name.toCharArray()) {
if (ch > 31) {