为了最终回答我自己的问题,这是我一直用来检测可能错误的实用程序类。我将 SWF 作为字节数组加载,并在将其加载为实际的 MovieClip 之前扫描内容。
如您所见,我的代码在很大程度上取决于com.segfaultlabs.swfutils 包
重要提示:我已经停止使用这种防止错误的方法,而是选择了更手动的方法来检查文件,方法是实际尝试加载它们并查看它们是否有效。这是因为该实用程序不完整,而且我目前对 ABC 格式的了解还不足以确保我可以开发出始终正确的检查。
在这里发布我的代码作为其他想要尝试它的人的起点:-)
package nl.ijsfontein.utils
{
import com.segfaultlabs.swfutils.ABC.ABCCPool;
import com.segfaultlabs.swfutils.ABC.ABCClass;
import com.segfaultlabs.swfutils.ABC.ABCInstance;
import com.segfaultlabs.swfutils.ABC.ABCMethodInfo;
import com.segfaultlabs.swfutils.ABC.ABCMultiname;
import com.segfaultlabs.swfutils.ABC.ABCParser;
import com.segfaultlabs.swfutils.ABC.ABCTraitConstSlot;
import com.segfaultlabs.swfutils.ABC.ABCTraitsInfo;
import com.segfaultlabs.swfutils.ABC.ABCinfo;
import com.segfaultlabs.swfutils.SWFDataInput;
import com.segfaultlabs.swfutils.SWFFile;
import flash.system.ApplicationDomain;
import flash.utils.ByteArray;
/**
* utility to see which classes a swf uses, but doesn't contain itself
* - this can be used to detect possible VerifyErrors before they happen.
*/
public class SwfDependencyUtil
{
public function SwfDependencyUtil()
{
}
// return null if ok, or name of needed class if external depencendy
private static function resolveSuper(abc:ABCinfo, superClass:String):String
{
//if (superClass.indexOf("flash.") == 0 || superClass.indexOf("*") == 0 || superClass.indexOf("Object") == 0)
if (superClass.indexOf("*") == 0)
{
trace(' super: ' + superClass + " (ignore)");
}
else
{
var superClassClass:ABCClass = null;
for each ( var c:ABCClass in abc.classes )
{
if (c.name == superClass)
{
superClassClass = c;
}
}
if (superClassClass)
{
trace(' super: ' + superClass + " (resolved internally)");
return resolveSuper(abc, superClassClass.iref.base);
}
else
{
trace(' super: ' + superClass + " (NOTFOUND)");
return superClass;
}
}
return null;
}
/*
* checks: classes, superclasses, static variables, member variables
* TODO: function arguments
* won't check: method bodies
*
* TODO: refactor to multiple methods
*/
public static function getDependencies(swfBytes:ByteArray):Array /* of String */
{
var result:Array = [];
swfBytes.position = 0;
var swfr:SWFFile = new SWFFile(swfBytes);
var arr:Array;
if ( swfr.compressed )
{
swfr.dataInput = swfr.uncompress();
swfr.readHeader();
};
arr = swfr.parseTags();
if ( arr[82] != null )
{
var abc:ABCinfo = new ABCinfo();
var cpool:ABCCPool = new ABCCPool();
var abcparse:ABCParser = new ABCParser();
abcparse.readMethodBytes = true;
abcparse.readExceptions = false;
for ( var j:int = 0; j < arr[82].length; j += 1 )
{
swfr.dataInstance.position = arr[82][j].position;
try
{
abcparse.parse( swfr.dataInput as SWFDataInput, abc, cpool, new FakeLogger() );
for each ( var c:ABCClass in abc.classes )
{
trace('class:', c.name);
var superClass:String = c.iref.base;
var dependency:String = resolveSuper(abc, superClass);
if (dependency)
{
result.push(dependency);
}
for each (var mn:ABCMultiname in c.iref.interfaces)
{
var interfaceName:String = mn.nsset[0] != "" ? mn.nsset[0] + "::" + mn.name : mn.name;
var interfaceDependency:String = resolveSuper(abc, interfaceName);
if (interfaceDependency)
{
result.push(interfaceDependency);
}
}
for each (var ti:ABCTraitsInfo in c.traits)
{
if (ti is ABCTraitConstSlot)
{
var constName:String
if (QName(ABCTraitConstSlot(ti).type).uri)
{
constName = QName(ABCTraitConstSlot(ti).type).uri + "::" + QName(ABCTraitConstSlot(ti).type).localName
}
else
{
constName = QName(ABCTraitConstSlot(ti).type).localName
}
var constDependency:String = resolveSuper(abc, constName);
if (constDependency)
{
result.push(constDependency);
}
}
else if (ti is ABCMethodInfo)
{
trace('method', ABCMethodInfo(ti).name);
} else
{
trace(ti);
}
// trace(ti.type.localName);
}
// const (static?) members: c.traits
}
for each ( var i:ABCInstance in abc.instances )
{
// trace(i);
for each (var instanceTi:ABCTraitsInfo in i.traits)
{
if (instanceTi is ABCTraitConstSlot)
{
trace('instance:', createClassNameFromQname(ABCTraitConstSlot(instanceTi).type));
var csdep:String = resolveSuper(abc, createClassNameFromQname(ABCTraitConstSlot(instanceTi).type));
if (csdep)
{
result.push(csdep);
}
}
else if (instanceTi is ABCMethodInfo)
{
}
else
{
trace('unexpected trait type');
}
}
}
abc.dispose();
}
catch ( e:Error )
{
trace( " Error ",e.getStackTrace() );
};
};
cpool.dispose();
}
else
{
trace("No DoABC block... ;(");
}
return result;
}
private static function createClassNameFromQname(qn:QName):String
{
var result:String
if (qn.uri)
{
result = qn.uri + "::" + qn.localName
}
else
{
result = qn.localName
}
return result;
}
public static function getUnsatisfiedDependencies(swfBytes:ByteArray):Array /* of String */
{
var result:Array = [];
var dependencies:Array = SwfDependencyUtil.getDependencies(swfBytes)
for each (var dependency:String in dependencies)
{
if (ApplicationDomain.currentDomain.hasDefinition(dependency))
{
trace('ok: ', dependency);
}
else
{
trace('ERROR: unsatisfied dependency: ', dependency);
result.push(dependency);
}
}
return result;
}
}
}