bool OCGs::optContentIsVisible( Object *dictRef )
{
Object dictObj;
Dict *dict;
Object dictType;
Object ocg;
Object policy;
bool result = true;
dictRef->fetch( m_xref, &dictObj );
if ( ! dictObj.isDict() ) {
error(-1, "Unexpected oc reference target: %i", dictObj.getType() );
dictObj.free();
return result;
}
dict = dictObj.getDict();
// printf("checking if optContent is visible\n");
dict->lookup("Type", &dictType);
if (dictType.isName("OCMD")) {
// If we supported Visibility Expressions, we'd check
// for a VE entry, and then call out to the parser here...
// printf("found OCMD dict\n");
dict->lookup("P", &policy);
dict->lookupNF("OCGs", &ocg);
if (ocg.isArray()) {
if (policy.isName("AllOn")) {
result = allOn( ocg.getArray() );
} else if (policy.isName("AllOff")) {
result = allOff( ocg.getArray() );
} else if (policy.isName("AnyOff")) {
result = anyOff( ocg.getArray() );
} else if ( (!policy.isName()) || (policy.isName("AnyOn") ) ) {
// this is the default
result = anyOn( ocg.getArray() );
}
} else if (ocg.isRef()) {
OptionalContentGroup* oc = findOcgByRef( ocg.getRef() );
if ( !oc || oc->getState() == OptionalContentGroup::Off ) {
result = false;
} else {
result = true ;
}
}
ocg.free();
policy.free();
} else if ( dictType.isName("OCG") ) {
OptionalContentGroup* oc = findOcgByRef( dictRef->getRef() );
if ( !oc || oc->getState() == OptionalContentGroup::Off ) {
result=false;
}
}
dictType.free();
dictObj.free();
// printf("visibility: %s\n", result? "on" : "off");
return result;
}
void PDFFormat::init(std::string& filename){
PDFDoc *doc = PDFDocFactory().createPDFDoc(GooString(filename.c_str()));
//GBool enc = doc->isEncrypted();
GooString ID;
Object obj,id_obj;
Dict* trailer = doc->getXRef()->getTrailerDict()->getDict();
trailer->lookupNF("ID",&obj);
obj.getArray()->getNF(0,&id_obj);
data.ID1.assign(id_obj.getString()->getCString(),16);
obj.getArray()->getNF(1,&id_obj);
data.ID2.assign(id_obj.getString()->getCString(),16);
GBool enc = trailer->hasKey("Encrypt");
if(enc){
is_encrypted = true;
trailer->lookupNF("Encrypt",&obj);
Object encObj;
doc->getXRef()->fetch(obj.getRef().num,obj.getRef().gen,&encObj);
encObj.getDict()->lookupNF("Filter",&obj);
encObj.getDict()->lookupNF("R",&obj);
this->data.R = obj.getInt();
encObj.getDict()->lookupNF("V",&obj);
this->data.V = obj.getInt();
encObj.getDict()->lookupNF("P",&obj);
this->data.P = obj.getInt();
encObj.getDict()->lookupNF("Length",&obj);
this->data.length = obj.getInt();
encObj.getDict()->lookupNF("O",&obj);
if ((int)this->data.R <= 4) {
/* Revision 4 or less => 32Byte O string */
this->data.O.assign(obj.getString()->getCString(),32);
} else {
/* Revision 5 or 6 => 48Byte O string */
this->data.O.assign(obj.getString()->getCString(),48);
::memcpy(this->data.O_valid_salt, this->data.O.substr(32, 8).c_str(), 8);
::memcpy(this->data.O_key_salt, this->data.O.substr(40, 8).c_str(), 8);
this->data.O.resize(32);
}
encObj.getDict()->lookupNF("U",&obj);
if ((int)this->data.R <= 4) {
/* Revision 4 or less => 32Byte U string */
this->data.U.assign(obj.getString()->getCString(),32);
} else {
/* Revision 5 or 6 => 48Byte U string */
this->data.U.assign(obj.getString()->getCString(),48);
::memcpy(this->data.U_valid_salt, this->data.U.substr(32, 8).c_str(), 8);
::memcpy(this->data.U_key_salt, this->data.U.substr(40, 8).c_str(), 8);
this->data.U.resize(32);
}
if(encObj.getDict()->hasKey("EncryptMetadata")){
encObj.getDict()->lookupNF("EncryptMetadata", &obj);
this->data.MetaEncrypted = obj.getBool();
}
int v_major = doc->getPDFMajorVersion();
int v_minor = doc->getPDFMinorVersion();
if (verbose) {
// Print PDF encryption information from EncObj
std::cout << "======= PDF information =======" << std::endl;
std::cout << "PDF version: " << v_major << "." << v_minor << std::endl;
if ((int)this->data.R == 5) {
std::cout << "Extension level 3 detected." << std::endl;
} else if ((int)this->data.R == 6) {
std::cout << "Extension level 5 detected." << std::endl;
} else if ((int)this->data.R > 6) {
std::cout << "Warning: Unknown (unsupported) security revision!" << std::endl;
}
std::cout << "Security revision: " << (int)this->data.R << std::endl;
std::cout << "Encryption alg. version: " << (int)this->data.V << std::endl;
std::cout << "Key length: " << (int)this->data.length << std::endl;
std::cout << "Metadata encrypted: ";
if (this->data.MetaEncrypted) {
std::cout << "yes";
} else {
std::cout << "no";
}
std::cout << std::endl;
std::cout << "===============================" << std::endl;
}
}else{
is_encrypted = false;
}
is_supported = true;
}
