pdfviewer: when q start, and an operator is called, it should not be able to see operands before q.…

experimental/PdfViewer/pdfparser/native/SkPdfNativeDoc.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPdfNativeDoc_DEFINED
 #define SkPdfNativeDoc_DEFINED
 
@@ skipping 18 matching lines @@
 class SkStream;
 
 class SkPdfNativeDoc {
 private:
     struct PublicObjectEntry {
         long fOffset;
         // long endOffset;  // TODO(edisonn): determine the end of the object, to be used when the doc is corrupted
         SkPdfNativeObject* fObj;
         // TODO(edisonn): perf ... probably it does not make sense to cache the ref. test it!
         SkPdfNativeObject* fResolvedReference;
+        bool fIsReferenceResolved;
     };
 
 public:
     // TODO(edisonn): read methods: file, stream, http(s)://url, url with seek?
     // TODO(edisonn): read first page asap, linearized
     // TODO(edisonn): read page N asap, read all file
     // TODO(edisonn): allow corruptions of file (e.g. missing endobj, missing stream length, ...)
     // TODO(edisonn): encryption
 
     SkPdfNativeDoc(const char* path);
@@ skipping 35 matching lines @@
 
     const unsigned char* readCrossReferenceSection(const unsigned char* xrefStart, const unsigned char* trailerEnd);
     const unsigned char* readTrailer(const unsigned char* trailerStart, const unsigned char* trailerEnd, bool storeCatalog, long* prev, bool skipKeyword);
 
     // TODO(edisonn): updates not supported right now, generation ignored
     void addCrossSectionInfo(int id, int generation, int offset, bool isFreed);
     static void reset(PublicObjectEntry* obj) {
         obj->fObj = NULL;
         obj->fResolvedReference = NULL;
         obj->fOffset = -1;
+        obj->fIsReferenceResolved = false;
     }
 
     SkPdfNativeObject* readObject(int id/*, int generation*/);
 
     void fillPages(SkPdfPageTreeNodeDictionary* tree);
 
     // private fields
     SkPdfAllocator* fAllocator;
     SkPdfMapper* fMapper;
     const unsigned char* fFileContent;
     size_t fContentLength;
     SkPdfNativeObject* fRootCatalogRef;
     SkPdfCatalogDictionary* fRootCatalog;
 
     mutable SkTDArray<PublicObjectEntry> fObjects;
     SkTDArray<SkPdfPageObjectDictionary*> fPages;
 };
 
 #endif  // SkPdfNativeDoc_DEFINED