[BlobStorage] Enforcing renderer constraints to prevent broken blobs

third_party/WebKit/Source/platform/blob/BlobData.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 167 matching lines @@
                            long long offset,
                            long long length,
                            double expectedModificationTime);
   void appendText(const String&, bool normalizeLineEndingsToNative);
 
   // The value of the size property for a Blob who has this data.
   // BlobDataItem::toEndOfFile if the Blob has a file whose size was not yet
   // determined.
   long long length() const;
 
+  bool isSingleUnknownSizeFile() const {
+    return m_fileComposition == FileCompositionStatus::SINGLE_UNKNOWN_SIZE_FILE;
+  }
+
  private:
   FRIEND_TEST_ALL_PREFIXES(BlobDataTest, Consolidation);
 
   enum class FileCompositionStatus {
     SINGLE_UNKNOWN_SIZE_FILE,
     NO_UNKNOWN_SIZE_FILES
   };
 
   explicit BlobData(FileCompositionStatus composition)
       : m_fileComposition(composition) {}
@@ skipping 23 matching lines @@
   static PassRefPtr<BlobDataHandle> create(const String& uuid,
                                            const String& type,
                                            long long size) {
     return adoptRef(new BlobDataHandle(uuid, type, size));
   }
 
   String uuid() const { return m_uuid.isolatedCopy(); }
   String type() const { return m_type.isolatedCopy(); }
   unsigned long long size() const { return m_size; }
 
+  bool isSingleUnknownSizeFile() const { return m_isSingleUnknownSizeFile; }
+
   ~BlobDataHandle();
 
  private:
   BlobDataHandle();
   BlobDataHandle(std::unique_ptr<BlobData>, long long size);
   BlobDataHandle(const String& uuid, const String& type, long long size);
 
   const String m_uuid;
   const String m_type;
   const long long m_size;
+  const bool m_isSingleUnknownSizeFile;
 };
 
 }  // namespace blink
 
 #endif  // BlobData_h