JBIG2Stream: Move Object instead of copying it

poppler/JBIG2Stream.cc

@@ -1174,7 +1174,7 @@ JBIG2CodeTable::~JBIG2CodeTable() {
 // JBIG2Stream
 //------------------------------------------------------------------------
 
-JBIG2Stream::JBIG2Stream(Stream *strA, Object *globalsStreamA, Object *globalsStreamRefA):
+JBIG2Stream::JBIG2Stream(Stream *strA, Object &&globalsStreamA, Object *globalsStreamRefA):
   FilterStream(strA)
 {
   pageBitmap = nullptr;
@@ -1199,8 +1199,8 @@ JBIG2Stream::JBIG2Stream(Stream *strA, Object *globalsStreamA, Object *globalsSt
   huffDecoder = new JBIG2HuffmanDecoder();
   mmrDecoder = new JBIG2MMRDecoder();
 
-  if (globalsStreamA->isStream()) {
-    globalsStream = globalsStreamA->copy();
+  if (globalsStreamA.isStream()) {
+    globalsStream = std::move(globalsStreamA);
     if (globalsStreamRefA->isRef())
       globalsStreamRef = globalsStreamRefA->getRef();
   }

poppler/JBIG2Stream.h

@@ -43,7 +43,7 @@ class JBIG2MMRDecoder;
 class JBIG2Stream: public FilterStream {
 public:
 
-  JBIG2Stream(Stream *strA, Object *globalsStreamA, Object *globalsStreamRefA);
+  JBIG2Stream(Stream *strA, Object &&globalsStreamA, Object *globalsStreamRefA);
   ~JBIG2Stream();
   StreamKind getKind() override { return strJBIG2; }
   void reset() override;

poppler/Stream.cc

@@ -213,7 +213,7 @@ Stream *Stream::makeFilter(const char *name, Stream *str, Object *params, int re
   int encoding;
   bool endOfLine, byteAlign, endOfBlock, black, damagedRowsBeforeError;
   int columns, rows;
-  Object globals, obj;
+  Object obj;
 
   if (!strcmp(name, "ASCIIHexDecode") || !strcmp(name, "AHx")) {
     str = new ASCIIHexStream(str);
@@ -325,12 +325,13 @@ Stream *Stream::makeFilter(const char *name, Stream *str, Object *params, int re
     }
     str = new FlateStream(str, pred, columns, colors, bits);
   } else if (!strcmp(name, "JBIG2Decode")) {
+    Object globals;
     if (params->isDict()) {
       XRef *xref = params->getDict()->getXRef();
       obj = params->dictLookupNF("JBIG2Globals");
       globals = obj.fetch(xref, recursion);
     }
-    str = new JBIG2Stream(str, &globals, &obj);
+    str = new JBIG2Stream(str, std::move(globals), &obj);
   } else if (!strcmp(name, "JPXDecode")) {
 #ifdef HAVE_JPX_DECODER
     str = new JPXStream(str);