Fixes for sequential devices

src/imageformats/pcx.cpp

@@ -174,7 +174,7 @@ static QDataStream &operator>>(QDataStream &s, PCXHEADER &ph)
 
     // Skip the rest of the header
     quint8 byte;
-    while (s.device()->pos() < 128) {
+    for (auto i = 0; i < 54; ++i) {
         s >> byte;
     }
 
@@ -684,12 +684,6 @@ bool PCXHandler::canRead(QIODevice *device)
         return false;
     }
 
-    // We do not support sequential images
-    // We need to know the current position to properly read the header
-    if (device->isSequential()) {
-        return false;
-    }
-
     qint64 oldPos = device->pos();
 
     char head[1];