Don't crash on decoding unsupported-attributes

src/ippmsg.cpp

@@ -38,7 +38,7 @@ IppMsg::IppMsg(QNetworkReply* resp)
 
     while(!bts.atEnd())
     {
-        if(bts.peekU8() <= IppTag::PrinterAttrs) {
+        if(bts.peekU8() <= IppTag::UnsupportedAttrs) {
 
             if(currentAttrType == IppTag::OpAttrs) {
                 _opAttrs = attrs;
@@ -49,6 +49,9 @@ IppMsg::IppMsg(QNetworkReply* resp)
             else if (currentAttrType == IppTag::PrinterAttrs) {
                 _printerAttrs = attrs;
             }
+            else if (currentAttrType == IppTag::UnsupportedAttrs) {
+                qDebug() << "WARNING: unsupported attrs reported:" << attrs;
+            }
 
             if(bts >>= (uint8_t)IppTag::EndAttrs) {
                 break;
@@ -78,12 +81,12 @@ QString IppMsg::consume_attribute(QJsonObject& attrs, Bytestream& data, QString
     data/tmp_len >> tmp_str;
     name = tmp_str!="" ? tmp_str.c_str() : lastName;
 
-
     switch (tag) {
         case OpAttrs:
         case JobAttrs:
         case EndAttrs:
         case PrinterAttrs:
+        case UnsupportedAttrs:
             Q_ASSERT(false);
         case Integer:
         case Enum:
@@ -245,7 +248,6 @@ Bytestream IppMsg::encode_attr(quint8 tag, QString name, QJsonValueRef value)
         }
         case Resolution:
         {
-            qDebug() << value << value.toObject();
             qint32 x = value.toObject()["x"].toInt();
             qint32 y = value.toObject()["y"].toInt();
             qint8 units = value.toObject()["units"].toInt();

src/ippmsg.h

@@ -19,6 +19,8 @@ public:
         JobAttrs            = 0x02,
         EndAttrs            = 0x03,
         PrinterAttrs        = 0x04,
+        UnsupportedAttrs    = 0x05,
+        Unsupported         = 0x10,
         Integer             = 0x21,
         Boolean             = 0x22,
         Enum                = 0x23,