1 files changed, 878 insertions, 0 deletions
diff --git a/dom/base/File.h b/dom/base/File.h
new file mode 100644
index 0000000000..aed1f68c3d
--- /dev/null
+++ b/dom/base/File.h
@@ -0,0 +1,878 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_File_h
+#define mozilla_dom_File_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/GuardObjects.h"
+#include "mozilla/LinkedList.h"
+#include "mozilla/StaticMutex.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/Date.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsCOMPtr.h"
+#include "nsIDOMBlob.h"
+#include "nsIFile.h"
+#include "nsIMemoryReporter.h"
+#include "nsIMutable.h"
+#include "nsIXMLHttpRequest.h"
+#include "nsString.h"
+#include "nsTemporaryFileInputStream.h"
+#include "nsWrapperCache.h"
+#include "nsWeakReference.h"
+
+class nsIFile;
+class nsIInputStream;
+
+#define BLOBIMPL_IID \
+  { 0xbccb3275, 0x6778, 0x4ac5, \
+    { 0xaf, 0x03, 0x90, 0xed, 0x37, 0xad, 0xdf, 0x5d } }
+
+namespace mozilla {
+namespace dom {
+
+struct BlobPropertyBag;
+struct ChromeFilePropertyBag;
+struct FilePropertyBag;
+class BlobImpl;
+class File;
+class OwningArrayBufferOrArrayBufferViewOrBlobOrUSVString;
+
+class Blob : public nsIDOMBlob
+           , public nsIXHRSendable
+           , public nsIMutable
+           , public nsSupportsWeakReference
+           , public nsWrapperCache
+{
+public:
+  NS_DECL_NSIDOMBLOB
+  NS_DECL_NSIXHRSENDABLE
+  NS_DECL_NSIMUTABLE
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(Blob, nsIDOMBlob)
+
+  typedef OwningArrayBufferOrArrayBufferViewOrBlobOrUSVString BlobPart;
+
+  // This creates a Blob or a File based on the type of BlobImpl.
+  static Blob*
+  Create(nsISupports* aParent, BlobImpl* aImpl);
+
+  static already_AddRefed<Blob>
+  Create(nsISupports* aParent, const nsAString& aContentType,
+         uint64_t aLength);
+
+  static already_AddRefed<Blob>
+  Create(nsISupports* aParent, const nsAString& aContentType, uint64_t aStart,
+         uint64_t aLength);
+
+  static already_AddRefed<Blob>
+  CreateStringBlob(nsISupports* aParent, const nsACString& aData,
+                   const nsAString& aContentType);
+
+  // The returned Blob takes ownership of aMemoryBuffer. aMemoryBuffer will be
+  // freed by free so it must be allocated by malloc or something
+  // compatible with it.
+  static already_AddRefed<Blob>
+  CreateMemoryBlob(nsISupports* aParent, void* aMemoryBuffer, uint64_t aLength,
+                   const nsAString& aContentType);
+
+  static already_AddRefed<Blob>
+  CreateTemporaryBlob(nsISupports* aParent, PRFileDesc* aFD,
+                      uint64_t aStartPos, uint64_t aLength,
+                      const nsAString& aContentType);
+
+  BlobImpl* Impl() const
+  {
+    return mImpl;
+  }
+
+  bool IsFile() const;
+
+  const nsTArray<RefPtr<BlobImpl>>* GetSubBlobImpls() const;
+
+  // This method returns null if this Blob is not a File; it returns
+  // the same object in case this Blob already implements the File interface;
+  // otherwise it returns a new File object with the same BlobImpl.
+  already_AddRefed<File> ToFile();
+
+  // This method creates a new File object with the given name and the same
+  // BlobImpl.
+  already_AddRefed<File> ToFile(const nsAString& aName,
+                                ErrorResult& aRv) const;
+
+  already_AddRefed<Blob>
+  CreateSlice(uint64_t aStart, uint64_t aLength, const nsAString& aContentType,
+              ErrorResult& aRv);
+
+  void
+  GetInternalStream(nsIInputStream** aStream, ErrorResult& aRv);
+
+  int64_t
+  GetFileId();
+
+  // WebIDL methods
+  nsISupports* GetParentObject() const
+  {
+    return mParent;
+  }
+
+  bool
+  IsMemoryFile() const;
+
+  // Blob constructor
+  static already_AddRefed<Blob>
+  Constructor(const GlobalObject& aGlobal,
+              const Optional<Sequence<BlobPart>>& aData,
+              const BlobPropertyBag& aBag,
+              ErrorResult& aRv);
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  uint64_t GetSize(ErrorResult& aRv);
+
+  void GetType(nsAString& aType);
+
+  already_AddRefed<Blob> Slice(const Optional<int64_t>& aStart,
+                               const Optional<int64_t>& aEnd,
+                               const nsAString& aContentType,
+                               ErrorResult& aRv);
+
+protected:
+  // File constructor should never be used directly. Use Blob::Create instead.
+  Blob(nsISupports* aParent, BlobImpl* aImpl);
+  virtual ~Blob() {};
+
+  virtual bool HasFileInterface() const { return false; }
+
+  // The member is the real backend implementation of this File/Blob.
+  // It's thread-safe and not CC-able and it's the only element that is moved
+  // between threads.
+  // Note: we should not store any other state in this class!
+  RefPtr<BlobImpl> mImpl;
+
+private:
+  nsCOMPtr<nsISupports> mParent;
+};
+
+class File final : public Blob
+{
+  friend class Blob;
+
+public:
+  // Note: BlobImpl must be a File in order to use this method.
+  // Check impl->IsFile().
+  static File*
+  Create(nsISupports* aParent, BlobImpl* aImpl);
+
+  static already_AddRefed<File>
+  Create(nsISupports* aParent, const nsAString& aName,
+         const nsAString& aContentType, uint64_t aLength,
+         int64_t aLastModifiedDate);
+
+  // The returned File takes ownership of aMemoryBuffer. aMemoryBuffer will be
+  // freed by free so it must be allocated by malloc or something
+  // compatible with it.
+  static already_AddRefed<File>
+  CreateMemoryFile(nsISupports* aParent, void* aMemoryBuffer, uint64_t aLength,
+                   const nsAString& aName, const nsAString& aContentType,
+                   int64_t aLastModifiedDate);
+
+  // This method creates a BlobFileImpl for the new File object. This is
+  // thread-safe, cross-process, cross-thread as any other BlobImpl, but, when
+  // GetType() is called, it must dispatch a runnable to the main-thread in
+  // order to use nsIMIMEService.
+  // Would be nice if we try to avoid to use this method outside the
+  // main-thread to avoid extra runnables.
+  static already_AddRefed<File>
+  CreateFromFile(nsISupports* aParent, nsIFile* aFile, bool aTemporary = false);
+
+  static already_AddRefed<File>
+  CreateFromFile(nsISupports* aParent, nsIFile* aFile, const nsAString& aName,
+                 const nsAString& aContentType);
+
+  // WebIDL methods
+
+  virtual JSObject* WrapObject(JSContext *cx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  // File constructor
+  static already_AddRefed<File>
+  Constructor(const GlobalObject& aGlobal,
+              const Sequence<BlobPart>& aData,
+              const nsAString& aName,
+              const FilePropertyBag& aBag,
+              ErrorResult& aRv);
+
+  // ChromeOnly
+  static already_AddRefed<File>
+  CreateFromFileName(const GlobalObject& aGlobal,
+                     const nsAString& aData,
+                     const ChromeFilePropertyBag& aBag,
+                     ErrorResult& aRv);
+
+  // ChromeOnly
+  static already_AddRefed<File>
+  CreateFromNsIFile(const GlobalObject& aGlobal,
+                    nsIFile* aData,
+                    const ChromeFilePropertyBag& aBag,
+                    ErrorResult& aRv);
+
+  void GetName(nsAString& aName) const;
+
+  int64_t GetLastModified(ErrorResult& aRv);
+
+  Date GetLastModifiedDate(ErrorResult& aRv);
+
+  void GetRelativePath(nsAString& aPath) const;
+
+  void GetMozFullPath(nsAString& aFilename, ErrorResult& aRv) const;
+
+  void GetMozFullPathInternal(nsAString& aName, ErrorResult& aRv) const;
+
+protected:
+  virtual bool HasFileInterface() const override { return true; }
+
+private:
+  // File constructor should never be used directly. Use Blob::Create or
+  // File::Create.
+  File(nsISupports* aParent, BlobImpl* aImpl);
+  ~File() {};
+};
+
+// This is the abstract class for any File backend. It must be nsISupports
+// because this class must be ref-counted and it has to work with IPC.
+class BlobImpl : public nsISupports
+{
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(BLOBIMPL_IID)
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  BlobImpl() {}
+
+  virtual void GetName(nsAString& aName) const = 0;
+
+  virtual void GetDOMPath(nsAString& aName) const = 0;
+
+  virtual void SetDOMPath(const nsAString& aName) = 0;
+
+  virtual int64_t GetLastModified(ErrorResult& aRv) = 0;
+
+  virtual void SetLastModified(int64_t aLastModified) = 0;
+
+  virtual void GetMozFullPath(nsAString& aName, ErrorResult& aRv) const = 0;
+
+  virtual void GetMozFullPathInternal(nsAString& aFileName, ErrorResult& aRv) const = 0;
+
+  virtual uint64_t GetSize(ErrorResult& aRv) = 0;
+
+  virtual void GetType(nsAString& aType) = 0;
+
+  /**
+   * An effectively-unique serial number identifying this instance of FileImpl.
+   *
+   * Implementations should obtain a serial number from
+   * FileImplBase::NextSerialNumber().
+   */
+  virtual uint64_t GetSerialNumber() const = 0;
+
+  already_AddRefed<BlobImpl>
+  Slice(const Optional<int64_t>& aStart, const Optional<int64_t>& aEnd,
+        const nsAString& aContentType, ErrorResult& aRv);
+
+  virtual already_AddRefed<BlobImpl>
+  CreateSlice(uint64_t aStart, uint64_t aLength,
+              const nsAString& aContentType, ErrorResult& aRv) = 0;
+
+  virtual const nsTArray<RefPtr<BlobImpl>>*
+  GetSubBlobImpls() const = 0;
+
+  virtual void GetInternalStream(nsIInputStream** aStream,
+                                 ErrorResult& aRv) = 0;
+
+  virtual int64_t GetFileId() = 0;
+
+  virtual nsresult GetSendInfo(nsIInputStream** aBody,
+                               uint64_t* aContentLength,
+                               nsACString& aContentType,
+                               nsACString& aCharset) = 0;
+
+  virtual nsresult GetMutable(bool* aMutable) const = 0;
+
+  virtual nsresult SetMutable(bool aMutable) = 0;
+
+  virtual void SetLazyData(const nsAString& aName,
+                           const nsAString& aContentType,
+                           uint64_t aLength,
+                           int64_t aLastModifiedDate) = 0;
+
+  virtual bool IsMemoryFile() const = 0;
+
+  virtual bool IsSizeUnknown() const = 0;
+
+  virtual bool IsDateUnknown() const = 0;
+
+  virtual bool IsFile() const = 0;
+
+  // Returns true if the BlobImpl is backed by an nsIFile and the underlying
+  // file is a directory.
+  virtual bool IsDirectory() const
+  {
+    return false;
+  }
+
+  // True if this implementation can be sent to other threads.
+  virtual bool MayBeClonedToOtherThreads() const
+  {
+    return true;
+  }
+
+protected:
+  virtual ~BlobImpl() {}
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(BlobImpl, BLOBIMPL_IID)
+
+class BlobImplBase : public BlobImpl
+{
+public:
+  BlobImplBase(const nsAString& aName, const nsAString& aContentType,
+               uint64_t aLength, int64_t aLastModifiedDate)
+    : mIsFile(true)
+    , mImmutable(false)
+    , mContentType(aContentType)
+    , mName(aName)
+    , mStart(0)
+    , mLength(aLength)
+    , mLastModificationDate(aLastModifiedDate)
+    , mSerialNumber(NextSerialNumber())
+  {
+    // Ensure non-null mContentType by default
+    mContentType.SetIsVoid(false);
+  }
+
+  BlobImplBase(const nsAString& aName, const nsAString& aContentType,
+               uint64_t aLength)
+    : mIsFile(true)
+    , mImmutable(false)
+    , mContentType(aContentType)
+    , mName(aName)
+    , mStart(0)
+    , mLength(aLength)
+    , mLastModificationDate(INT64_MAX)
+    , mSerialNumber(NextSerialNumber())
+  {
+    // Ensure non-null mContentType by default
+    mContentType.SetIsVoid(false);
+  }
+
+  BlobImplBase(const nsAString& aContentType, uint64_t aLength)
+    : mIsFile(false)
+    , mImmutable(false)
+    , mContentType(aContentType)
+    , mStart(0)
+    , mLength(aLength)
+    , mLastModificationDate(INT64_MAX)
+    , mSerialNumber(NextSerialNumber())
+  {
+    // Ensure non-null mContentType by default
+    mContentType.SetIsVoid(false);
+  }
+
+  BlobImplBase(const nsAString& aContentType, uint64_t aStart,
+               uint64_t aLength)
+    : mIsFile(false)
+    , mImmutable(false)
+    , mContentType(aContentType)
+    , mStart(aStart)
+    , mLength(aLength)
+    , mLastModificationDate(INT64_MAX)
+    , mSerialNumber(NextSerialNumber())
+  {
+    NS_ASSERTION(aLength != UINT64_MAX,
+                 "Must know length when creating slice");
+    // Ensure non-null mContentType by default
+    mContentType.SetIsVoid(false);
+  }
+
+  virtual void GetName(nsAString& aName) const override;
+
+  virtual void GetDOMPath(nsAString& aName) const override;
+
+  virtual void SetDOMPath(const nsAString& aName) override;
+
+  virtual int64_t GetLastModified(ErrorResult& aRv) override;
+
+  virtual void SetLastModified(int64_t aLastModified) override;
+
+  virtual void GetMozFullPath(nsAString& aName, ErrorResult& aRv) const override;
+
+  virtual void GetMozFullPathInternal(nsAString& aFileName,
+                                      ErrorResult& aRv) const override;
+
+  virtual uint64_t GetSize(ErrorResult& aRv) override
+  {
+    return mLength;
+  }
+
+  virtual void GetType(nsAString& aType) override;
+
+  virtual uint64_t GetSerialNumber() const override { return mSerialNumber; }
+
+  virtual already_AddRefed<BlobImpl>
+  CreateSlice(uint64_t aStart, uint64_t aLength,
+              const nsAString& aContentType, ErrorResult& aRv) override
+  {
+    return nullptr;
+  }
+
+  virtual const nsTArray<RefPtr<BlobImpl>>*
+  GetSubBlobImpls() const override
+  {
+    return nullptr;
+  }
+
+  virtual void GetInternalStream(nsIInputStream** aStream,
+                                 ErrorResult& aRv) override
+  {
+    aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
+  }
+
+  virtual int64_t GetFileId() override;
+
+  virtual nsresult GetSendInfo(nsIInputStream** aBody,
+                               uint64_t* aContentLength,
+                               nsACString& aContentType,
+                               nsACString& aCharset) override;
+
+  virtual nsresult GetMutable(bool* aMutable) const override;
+
+  virtual nsresult SetMutable(bool aMutable) override;
+
+  virtual void
+  SetLazyData(const nsAString& aName, const nsAString& aContentType,
+              uint64_t aLength, int64_t aLastModifiedDate) override
+  {
+    mName = aName;
+    mContentType = aContentType;
+    mLength = aLength;
+    mLastModificationDate = aLastModifiedDate;
+    mIsFile = !aName.IsVoid();
+  }
+
+  virtual bool IsMemoryFile() const override
+  {
+    return false;
+  }
+
+  virtual bool IsDateUnknown() const override
+  {
+    return mIsFile && mLastModificationDate == INT64_MAX;
+  }
+
+  virtual bool IsFile() const override
+  {
+    return mIsFile;
+  }
+
+  virtual bool IsSizeUnknown() const override
+  {
+    return mLength == UINT64_MAX;
+  }
+
+protected:
+  virtual ~BlobImplBase() {}
+
+  /**
+   * Returns a new, effectively-unique serial number. This should be used
+   * by implementations to obtain a serial number for GetSerialNumber().
+   * The implementation is thread safe.
+   */
+  static uint64_t NextSerialNumber();
+
+  bool mIsFile;
+  bool mImmutable;
+
+  nsString mContentType;
+  nsString mName;
+  nsString mPath; // The path relative to a directory chosen by the user
+
+  uint64_t mStart;
+  uint64_t mLength;
+
+  int64_t mLastModificationDate;
+
+  const uint64_t mSerialNumber;
+};
+
+class BlobImplString final : public BlobImplBase
+                           , public nsIMemoryReporter
+{
+  MOZ_DEFINE_MALLOC_SIZE_OF(MallocSizeOf)
+
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIMEMORYREPORTER
+
+  static already_AddRefed<BlobImplString>
+  Create(const nsACString& aData, const nsAString& aContentType);
+
+  virtual void GetInternalStream(nsIInputStream** aStream,
+                                 ErrorResult& aRv) override;
+
+  virtual already_AddRefed<BlobImpl>
+  CreateSlice(uint64_t aStart, uint64_t aLength,
+              const nsAString& aContentType, ErrorResult& aRv) override;
+
+private:
+  BlobImplString(const nsACString& aData, const nsAString& aContentType);
+
+  ~BlobImplString();
+
+  nsCString mData;
+};
+
+/**
+ * This class may be used off the main thread, and in particular, its
+ * constructor and destructor may not run on the same thread.  Be careful!
+ */
+class BlobImplMemory final : public BlobImplBase
+{
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  BlobImplMemory(void* aMemoryBuffer, uint64_t aLength, const nsAString& aName,
+                 const nsAString& aContentType, int64_t aLastModifiedDate)
+    : BlobImplBase(aName, aContentType, aLength, aLastModifiedDate)
+    , mDataOwner(new DataOwner(aMemoryBuffer, aLength))
+  {
+    NS_ASSERTION(mDataOwner && mDataOwner->mData, "must have data");
+  }
+
+  BlobImplMemory(void* aMemoryBuffer, uint64_t aLength,
+                 const nsAString& aContentType)
+    : BlobImplBase(aContentType, aLength)
+    , mDataOwner(new DataOwner(aMemoryBuffer, aLength))
+  {
+    NS_ASSERTION(mDataOwner && mDataOwner->mData, "must have data");
+  }
+
+  virtual void GetInternalStream(nsIInputStream** aStream,
+                                 ErrorResult& aRv) override;
+
+  virtual already_AddRefed<BlobImpl>
+  CreateSlice(uint64_t aStart, uint64_t aLength,
+              const nsAString& aContentType, ErrorResult& aRv) override;
+
+  virtual bool IsMemoryFile() const override
+  {
+    return true;
+  }
+
+  class DataOwner final : public mozilla::LinkedListElement<DataOwner>
+  {
+  public:
+    NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DataOwner)
+    DataOwner(void* aMemoryBuffer, uint64_t aLength)
+      : mData(aMemoryBuffer)
+      , mLength(aLength)
+    {
+      mozilla::StaticMutexAutoLock lock(sDataOwnerMutex);
+
+      if (!sDataOwners) {
+        sDataOwners = new mozilla::LinkedList<DataOwner>();
+        EnsureMemoryReporterRegistered();
+      }
+      sDataOwners->insertBack(this);
+    }
+
+  private:
+    // Private destructor, to discourage deletion outside of Release():
+    ~DataOwner() {
+      mozilla::StaticMutexAutoLock lock(sDataOwnerMutex);
+
+      remove();
+      if (sDataOwners->isEmpty()) {
+        // Free the linked list if it's empty.
+        sDataOwners = nullptr;
+      }
+
+      free(mData);
+    }
+
+  public:
+    static void EnsureMemoryReporterRegistered();
+
+    // sDataOwners and sMemoryReporterRegistered may only be accessed while
+    // holding sDataOwnerMutex!  You also must hold the mutex while touching
+    // elements of the linked list that DataOwner inherits from.
+    static mozilla::StaticMutex sDataOwnerMutex;
+    static mozilla::StaticAutoPtr<mozilla::LinkedList<DataOwner> > sDataOwners;
+    static bool sMemoryReporterRegistered;
+
+    void* mData;
+    uint64_t mLength;
+  };
+
+private:
+  // Create slice
+  BlobImplMemory(const BlobImplMemory* aOther, uint64_t aStart,
+                 uint64_t aLength, const nsAString& aContentType)
+    : BlobImplBase(aContentType, aOther->mStart + aStart, aLength)
+    , mDataOwner(aOther->mDataOwner)
+  {
+    NS_ASSERTION(mDataOwner && mDataOwner->mData, "must have data");
+    mImmutable = aOther->mImmutable;
+  }
+
+  ~BlobImplMemory() {}
+
+  // Used when backed by a memory store
+  RefPtr<DataOwner> mDataOwner;
+};
+
+class BlobImplTemporaryBlob final : public BlobImplBase
+{
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  BlobImplTemporaryBlob(PRFileDesc* aFD, uint64_t aStartPos,
+                        uint64_t aLength, const nsAString& aContentType)
+    : BlobImplBase(aContentType, aLength)
+    , mStartPos(aStartPos)
+  {
+    mFileDescOwner = new nsTemporaryFileInputStream::FileDescOwner(aFD);
+  }
+
+  virtual void GetInternalStream(nsIInputStream** aStream,
+                                 ErrorResult& aRv) override;
+
+  virtual already_AddRefed<BlobImpl>
+  CreateSlice(uint64_t aStart, uint64_t aLength,
+              const nsAString& aContentType, ErrorResult& aRv) override;
+
+private:
+  BlobImplTemporaryBlob(const BlobImplTemporaryBlob* aOther,
+                        uint64_t aStart, uint64_t aLength,
+                        const nsAString& aContentType)
+    : BlobImplBase(aContentType, aLength)
+    , mStartPos(aStart)
+    , mFileDescOwner(aOther->mFileDescOwner)
+  {}
+
+  ~BlobImplTemporaryBlob() {}
+
+  uint64_t mStartPos;
+  RefPtr<nsTemporaryFileInputStream::FileDescOwner> mFileDescOwner;
+};
+
+class BlobImplFile : public BlobImplBase
+{
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  // Create as a file
+  explicit BlobImplFile(nsIFile* aFile, bool aTemporary = false)
+    : BlobImplBase(EmptyString(), EmptyString(), UINT64_MAX, INT64_MAX)
+    , mFile(aFile)
+    , mWholeFile(true)
+    , mIsTemporary(aTemporary)
+  {
+    NS_ASSERTION(mFile, "must have file");
+    // Lazily get the content type and size
+    mContentType.SetIsVoid(true);
+    mFile->GetLeafName(mName);
+  }
+
+  // Create as a file
+  BlobImplFile(const nsAString& aName, const nsAString& aContentType,
+               uint64_t aLength, nsIFile* aFile)
+    : BlobImplBase(aName, aContentType, aLength, UINT64_MAX)
+    , mFile(aFile)
+    , mWholeFile(true)
+    , mIsTemporary(false)
+  {
+    NS_ASSERTION(mFile, "must have file");
+  }
+
+  BlobImplFile(const nsAString& aName, const nsAString& aContentType,
+               uint64_t aLength, nsIFile* aFile,
+               int64_t aLastModificationDate)
+    : BlobImplBase(aName, aContentType, aLength, aLastModificationDate)
+    , mFile(aFile)
+    , mWholeFile(true)
+    , mIsTemporary(false)
+  {
+    NS_ASSERTION(mFile, "must have file");
+  }
+
+  // Create as a file with custom name
+  BlobImplFile(nsIFile* aFile, const nsAString& aName,
+               const nsAString& aContentType)
+    : BlobImplBase(aName, aContentType, UINT64_MAX, INT64_MAX)
+    , mFile(aFile)
+    , mWholeFile(true)
+    , mIsTemporary(false)
+  {
+    NS_ASSERTION(mFile, "must have file");
+    if (aContentType.IsEmpty()) {
+      // Lazily get the content type and size
+      mContentType.SetIsVoid(true);
+    }
+  }
+
+  // Overrides
+  virtual uint64_t GetSize(ErrorResult& aRv) override;
+  virtual void GetType(nsAString& aType) override;
+  virtual int64_t GetLastModified(ErrorResult& aRv) override;
+  virtual void SetLastModified(int64_t aLastModified) override;
+  virtual void GetMozFullPathInternal(nsAString& aFullPath,
+                                      ErrorResult& aRv) const override;
+  virtual void GetInternalStream(nsIInputStream** aInputStream,
+                                 ErrorResult& aRv) override;
+
+  virtual bool IsDirectory() const override;
+
+  // We always have size and date for this kind of blob.
+  virtual bool IsSizeUnknown() const override { return false; }
+  virtual bool IsDateUnknown() const override { return false; }
+
+protected:
+  virtual ~BlobImplFile() {
+    if (mFile && mIsTemporary) {
+      NS_WARNING("In temporary ~BlobImplFile");
+      // Ignore errors if any, not much we can do. Clean-up will be done by
+      // https://mxr.mozilla.org/mozilla-central/source/xpcom/io/nsAnonymousTemporaryFile.cpp?rev=6c1c7e45c902#127
+#ifdef DEBUG
+      nsresult rv =
+#endif
+      mFile->Remove(false);
+      NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                           "Failed to remove temporary DOMFile.");
+    }
+  }
+
+private:
+  // Create slice
+  BlobImplFile(const BlobImplFile* aOther, uint64_t aStart,
+               uint64_t aLength, const nsAString& aContentType)
+    : BlobImplBase(aContentType, aOther->mStart + aStart, aLength)
+    , mFile(aOther->mFile)
+    , mWholeFile(false)
+    , mIsTemporary(false)
+  {
+    NS_ASSERTION(mFile, "must have file");
+    mImmutable = aOther->mImmutable;
+  }
+
+  virtual already_AddRefed<BlobImpl>
+  CreateSlice(uint64_t aStart, uint64_t aLength,
+              const nsAString& aContentType, ErrorResult& aRv) override;
+
+  nsCOMPtr<nsIFile> mFile;
+  bool mWholeFile;
+  bool mIsTemporary;
+};
+
+class EmptyBlobImpl final : public BlobImplBase
+{
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  explicit EmptyBlobImpl(const nsAString& aContentType)
+    : BlobImplBase(aContentType, 0 /* aLength */)
+  {
+    mImmutable = true;
+  }
+
+  EmptyBlobImpl(const nsAString& aName,
+                const nsAString& aContentType,
+                int64_t aLastModifiedDate)
+    : BlobImplBase(aName, aContentType, 0, aLastModifiedDate)
+  {
+    mImmutable = true;
+  }
+
+  virtual void GetInternalStream(nsIInputStream** aStream,
+                                 ErrorResult& aRv) override;
+
+  virtual already_AddRefed<BlobImpl>
+  CreateSlice(uint64_t aStart, uint64_t aLength,
+              const nsAString& aContentType, ErrorResult& aRv) override;
+
+  virtual bool IsMemoryFile() const override
+  {
+    return true;
+  }
+
+private:
+  ~EmptyBlobImpl() {}
+};
+
+class BlobImplStream final : public BlobImplBase
+                           , public nsIMemoryReporter
+{
+  MOZ_DEFINE_MALLOC_SIZE_OF(MallocSizeOf)
+
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIMEMORYREPORTER
+
+  static already_AddRefed<BlobImplStream>
+  Create(nsIInputStream* aInputStream,
+         const nsAString& aContentType,
+         uint64_t aLength);
+
+  static already_AddRefed<BlobImplStream>
+  Create(nsIInputStream* aInputStream,
+         const nsAString& aName,
+         const nsAString& aContentType,
+         int64_t aLastModifiedDate,
+         uint64_t aLength);
+
+  virtual void GetInternalStream(nsIInputStream** aStream,
+                                 ErrorResult& aRv) override;
+
+  virtual already_AddRefed<BlobImpl>
+  CreateSlice(uint64_t aStart, uint64_t aLength,
+              const nsAString& aContentType, ErrorResult& aRv) override;
+
+  virtual bool IsMemoryFile() const override
+  {
+    return true;
+  }
+
+private:
+  BlobImplStream(nsIInputStream* aInputStream,
+                 const nsAString& aContentType,
+                 uint64_t aLength);
+
+  BlobImplStream(nsIInputStream* aInputStream,
+                 const nsAString& aName,
+                 const nsAString& aContentType,
+                 int64_t aLastModifiedDate,
+                 uint64_t aLength);
+
+  BlobImplStream(BlobImplStream* aOther,
+                 const nsAString& aContentType,
+                 uint64_t aStart,
+                 uint64_t aLength);
+
+  ~BlobImplStream();
+
+  void MaybeRegisterMemoryReporter();
+
+  nsCOMPtr<nsIInputStream> mInputStream;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_File_h