michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef nsDOMFile_h__
michael@0: #define nsDOMFile_h__
michael@0: 
michael@0: #include "mozilla/Attributes.h"
michael@0: #include "nsICharsetDetectionObserver.h"
michael@0: #include "nsIFile.h"
michael@0: #include "nsIDOMFile.h"
michael@0: #include "nsIDOMFileList.h"
michael@0: #include "nsIInputStream.h"
michael@0: #include "nsIJSNativeInitializer.h"
michael@0: #include "nsIMutable.h"
michael@0: #include "nsCOMArray.h"
michael@0: #include "nsCOMPtr.h"
michael@0: #include "nsString.h"
michael@0: #include "nsIXMLHttpRequest.h"
michael@0: #include "nsAutoPtr.h"
michael@0: #include "nsFileStreams.h"
michael@0: #include "nsTemporaryFileInputStream.h"
michael@0: 
michael@0: #include "mozilla/GuardObjects.h"
michael@0: #include "mozilla/LinkedList.h"
michael@0: #include <stdint.h>
michael@0: #include "mozilla/StaticMutex.h"
michael@0: #include "mozilla/StaticPtr.h"
michael@0: #include "mozilla/dom/DOMError.h"
michael@0: #include "mozilla/dom/indexedDB/FileInfo.h"
michael@0: #include "mozilla/dom/indexedDB/FileManager.h"
michael@0: #include "mozilla/dom/indexedDB/IndexedDatabaseManager.h"
michael@0: #include "nsWrapperCache.h"
michael@0: #include "nsCycleCollectionParticipant.h"
michael@0: 
michael@0: class nsIFile;
michael@0: class nsIInputStream;
michael@0: class nsIClassInfo;
michael@0: 
michael@0: class nsDOMFileBase : public nsIDOMFile,
michael@0:                       public nsIXHRSendable,
michael@0:                       public nsIMutable
michael@0: {
michael@0: public:
michael@0:   typedef mozilla::dom::indexedDB::FileInfo FileInfo;
michael@0: 
michael@0:   virtual already_AddRefed<nsIDOMBlob>
michael@0:   CreateSlice(uint64_t aStart, uint64_t aLength,
michael@0:               const nsAString& aContentType) = 0;
michael@0: 
michael@0:   virtual const nsTArray<nsCOMPtr<nsIDOMBlob> >*
michael@0:   GetSubBlobs() const { return nullptr; }
michael@0: 
michael@0:   NS_DECL_NSIDOMBLOB
michael@0:   NS_DECL_NSIDOMFILE
michael@0:   NS_DECL_NSIXHRSENDABLE
michael@0:   NS_DECL_NSIMUTABLE
michael@0: 
michael@0:   void
michael@0:   SetLazyData(const nsAString& aName, const nsAString& aContentType,
michael@0:               uint64_t aLength, uint64_t aLastModifiedDate)
michael@0:   {
michael@0:     NS_ASSERTION(aLength, "must have length");
michael@0: 
michael@0:     mName = aName;
michael@0:     mContentType = aContentType;
michael@0:     mLength = aLength;
michael@0:     mLastModificationDate = aLastModifiedDate;
michael@0:     mIsFile = !aName.IsVoid();
michael@0:   }
michael@0: 
michael@0:   bool IsSizeUnknown() const
michael@0:   {
michael@0:     return mLength == UINT64_MAX;
michael@0:   }
michael@0: 
michael@0:   bool IsDateUnknown() const
michael@0:   {
michael@0:     return mIsFile && mLastModificationDate == UINT64_MAX;
michael@0:   }
michael@0: 
michael@0: protected:
michael@0:   nsDOMFileBase(const nsAString& aName, const nsAString& aContentType,
michael@0:                 uint64_t aLength, uint64_t aLastModifiedDate)
michael@0:     : mIsFile(true), mImmutable(false), mContentType(aContentType),
michael@0:       mName(aName), mStart(0), mLength(aLength), mLastModificationDate(aLastModifiedDate)
michael@0:   {
michael@0:     // Ensure non-null mContentType by default
michael@0:     mContentType.SetIsVoid(false);
michael@0:   }
michael@0: 
michael@0:   nsDOMFileBase(const nsAString& aName, const nsAString& aContentType,
michael@0:                 uint64_t aLength)
michael@0:     : mIsFile(true), mImmutable(false), mContentType(aContentType),
michael@0:       mName(aName), mStart(0), mLength(aLength), mLastModificationDate(UINT64_MAX)
michael@0:   {
michael@0:     // Ensure non-null mContentType by default
michael@0:     mContentType.SetIsVoid(false);
michael@0:   }
michael@0: 
michael@0:   nsDOMFileBase(const nsAString& aContentType, uint64_t aLength)
michael@0:     : mIsFile(false), mImmutable(false), mContentType(aContentType),
michael@0:       mStart(0), mLength(aLength), mLastModificationDate(UINT64_MAX)
michael@0:   {
michael@0:     // Ensure non-null mContentType by default
michael@0:     mContentType.SetIsVoid(false);
michael@0:   }
michael@0: 
michael@0:   nsDOMFileBase(const nsAString& aContentType, uint64_t aStart,
michael@0:                 uint64_t aLength)
michael@0:     : mIsFile(false), mImmutable(false), mContentType(aContentType),
michael@0:       mStart(aStart), mLength(aLength), mLastModificationDate(UINT64_MAX)
michael@0:   {
michael@0:     NS_ASSERTION(aLength != UINT64_MAX,
michael@0:                  "Must know length when creating slice");
michael@0:     // Ensure non-null mContentType by default
michael@0:     mContentType.SetIsVoid(false);
michael@0:   }
michael@0: 
michael@0:   virtual ~nsDOMFileBase() {}
michael@0: 
michael@0:   virtual bool IsStoredFile() const
michael@0:   {
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   virtual bool IsWholeFile() const
michael@0:   {
michael@0:     NS_NOTREACHED("Should only be called on dom blobs backed by files!");
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   virtual bool IsSnapshot() const
michael@0:   {
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   FileInfo* GetFileInfo() const
michael@0:   {
michael@0:     NS_ASSERTION(IsStoredFile(), "Should only be called on stored files!");
michael@0:     NS_ASSERTION(!mFileInfos.IsEmpty(), "Must have at least one file info!");
michael@0: 
michael@0:     return mFileInfos.ElementAt(0);
michael@0:   }
michael@0: 
michael@0:   bool mIsFile;
michael@0:   bool mImmutable;
michael@0: 
michael@0:   nsString mContentType;
michael@0:   nsString mName;
michael@0:   nsString mPath; // The path relative to a directory chosen by the user
michael@0: 
michael@0:   uint64_t mStart;
michael@0:   uint64_t mLength;
michael@0: 
michael@0:   uint64_t mLastModificationDate;
michael@0: 
michael@0:   // Protected by IndexedDatabaseManager::FileMutex()
michael@0:   nsTArray<nsRefPtr<FileInfo> > mFileInfos;
michael@0: };
michael@0: 
michael@0: class nsDOMFile : public nsDOMFileBase
michael@0: {
michael@0: public:
michael@0:   nsDOMFile(const nsAString& aName, const nsAString& aContentType,
michael@0:             uint64_t aLength, uint64_t aLastModifiedDate)
michael@0:   : nsDOMFileBase(aName, aContentType, aLength, aLastModifiedDate)
michael@0:   { }
michael@0: 
michael@0:   nsDOMFile(const nsAString& aName, const nsAString& aContentType,
michael@0:             uint64_t aLength)
michael@0:   : nsDOMFileBase(aName, aContentType, aLength)
michael@0:   { }
michael@0: 
michael@0:   nsDOMFile(const nsAString& aContentType, uint64_t aLength)
michael@0:   : nsDOMFileBase(aContentType, aLength)
michael@0:   { }
michael@0: 
michael@0:   nsDOMFile(const nsAString& aContentType, uint64_t aStart, uint64_t aLength)
michael@0:   : nsDOMFileBase(aContentType, aStart, aLength)
michael@0:   { }
michael@0: 
michael@0:   NS_DECL_THREADSAFE_ISUPPORTS
michael@0: };
michael@0: 
michael@0: class nsDOMFileCC : public nsDOMFileBase
michael@0: {
michael@0: public:
michael@0:   nsDOMFileCC(const nsAString& aName, const nsAString& aContentType,
michael@0:               uint64_t aLength)
michael@0:   : nsDOMFileBase(aName, aContentType, aLength)
michael@0:   { }
michael@0: 
michael@0:   nsDOMFileCC(const nsAString& aContentType, uint64_t aLength)
michael@0:   : nsDOMFileBase(aContentType, aLength)
michael@0:   { }
michael@0: 
michael@0:   nsDOMFileCC(const nsAString& aContentType, uint64_t aStart, uint64_t aLength)
michael@0:   : nsDOMFileBase(aContentType, aStart, aLength)
michael@0:   { }
michael@0: 
michael@0:   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
michael@0: 
michael@0:   NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsDOMFileCC, nsIDOMFile)
michael@0: };
michael@0: 
michael@0: class nsDOMFileFile : public nsDOMFile
michael@0: {
michael@0: public:
michael@0:   // Create as a file
michael@0:   nsDOMFileFile(nsIFile *aFile)
michael@0:     : nsDOMFile(EmptyString(), EmptyString(), UINT64_MAX, UINT64_MAX),
michael@0:       mFile(aFile), mWholeFile(true), mStoredFile(false)
michael@0:   {
michael@0:     NS_ASSERTION(mFile, "must have file");
michael@0:     // Lazily get the content type and size
michael@0:     mContentType.SetIsVoid(true);
michael@0:     mFile->GetLeafName(mName);
michael@0:   }
michael@0: 
michael@0:   nsDOMFileFile(nsIFile *aFile, FileInfo *aFileInfo)
michael@0:     : nsDOMFile(EmptyString(), EmptyString(), UINT64_MAX, UINT64_MAX),
michael@0:       mFile(aFile), mWholeFile(true), mStoredFile(true)
michael@0:   {
michael@0:     NS_ASSERTION(mFile, "must have file");
michael@0:     NS_ASSERTION(aFileInfo, "must have file info");
michael@0:     // Lazily get the content type and size
michael@0:     mContentType.SetIsVoid(true);
michael@0:     mFile->GetLeafName(mName);
michael@0: 
michael@0:     mFileInfos.AppendElement(aFileInfo);
michael@0:   }
michael@0: 
michael@0:   // Create as a file
michael@0:   nsDOMFileFile(const nsAString& aName, const nsAString& aContentType,
michael@0:                 uint64_t aLength, nsIFile *aFile)
michael@0:     : nsDOMFile(aName, aContentType, aLength, UINT64_MAX),
michael@0:       mFile(aFile), mWholeFile(true), mStoredFile(false)
michael@0:   {
michael@0:     NS_ASSERTION(mFile, "must have file");
michael@0:   }
michael@0: 
michael@0:   nsDOMFileFile(const nsAString& aName, const nsAString& aContentType,
michael@0:                 uint64_t aLength, nsIFile *aFile, uint64_t aLastModificationDate)
michael@0:     : nsDOMFile(aName, aContentType, aLength, aLastModificationDate),
michael@0:       mFile(aFile), mWholeFile(true), mStoredFile(false)
michael@0:   {
michael@0:     NS_ASSERTION(mFile, "must have file");
michael@0:   }
michael@0: 
michael@0:   // Create as a file with custom name
michael@0:   nsDOMFileFile(nsIFile *aFile, const nsAString& aName,
michael@0:                 const nsAString& aContentType)
michael@0:     : nsDOMFile(aName, aContentType, UINT64_MAX, UINT64_MAX),
michael@0:       mFile(aFile), mWholeFile(true), mStoredFile(false)
michael@0:   {
michael@0:     NS_ASSERTION(mFile, "must have file");
michael@0:     if (aContentType.IsEmpty()) {
michael@0:       // Lazily get the content type and size
michael@0:       mContentType.SetIsVoid(true);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Create as a stored file
michael@0:   nsDOMFileFile(const nsAString& aName, const nsAString& aContentType,
michael@0:                 uint64_t aLength, nsIFile* aFile,
michael@0:                 FileInfo* aFileInfo)
michael@0:     : nsDOMFile(aName, aContentType, aLength, UINT64_MAX),
michael@0:       mFile(aFile), mWholeFile(true), mStoredFile(true)
michael@0:   {
michael@0:     NS_ASSERTION(mFile, "must have file");
michael@0:     mFileInfos.AppendElement(aFileInfo);
michael@0:   }
michael@0: 
michael@0:   // Create as a stored blob
michael@0:   nsDOMFileFile(const nsAString& aContentType, uint64_t aLength,
michael@0:                 nsIFile* aFile, FileInfo* aFileInfo)
michael@0:     : nsDOMFile(aContentType, aLength),
michael@0:       mFile(aFile), mWholeFile(true), mStoredFile(true)
michael@0:   {
michael@0:     NS_ASSERTION(mFile, "must have file");
michael@0:     mFileInfos.AppendElement(aFileInfo);
michael@0:   }
michael@0: 
michael@0:   // Create as a file to be later initialized
michael@0:   nsDOMFileFile()
michael@0:     : nsDOMFile(EmptyString(), EmptyString(), UINT64_MAX, UINT64_MAX),
michael@0:       mWholeFile(true), mStoredFile(false)
michael@0:   {
michael@0:     // Lazily get the content type and size
michael@0:     mContentType.SetIsVoid(true);
michael@0:     mName.SetIsVoid(true);
michael@0:   }
michael@0: 
michael@0:   // Overrides
michael@0:   NS_IMETHOD GetSize(uint64_t* aSize) MOZ_OVERRIDE;
michael@0:   NS_IMETHOD GetType(nsAString& aType) MOZ_OVERRIDE;
michael@0:   NS_IMETHOD GetLastModifiedDate(JSContext* cx, JS::MutableHandle<JS::Value> aLastModifiedDate) MOZ_OVERRIDE;
michael@0:   NS_IMETHOD GetMozLastModifiedDate(uint64_t* aLastModifiedDate) MOZ_OVERRIDE;
michael@0:   NS_IMETHOD GetMozFullPathInternal(nsAString& aFullPath) MOZ_OVERRIDE;
michael@0:   NS_IMETHOD GetInternalStream(nsIInputStream**) MOZ_OVERRIDE;
michael@0: 
michael@0:   void SetPath(const nsAString& aFullPath);
michael@0: 
michael@0: protected:
michael@0:   // Create slice
michael@0:   nsDOMFileFile(const nsDOMFileFile* aOther, uint64_t aStart, uint64_t aLength,
michael@0:                 const nsAString& aContentType)
michael@0:     : nsDOMFile(aContentType, aOther->mStart + aStart, aLength),
michael@0:       mFile(aOther->mFile), mWholeFile(false),
michael@0:       mStoredFile(aOther->mStoredFile)
michael@0:   {
michael@0:     NS_ASSERTION(mFile, "must have file");
michael@0:     mImmutable = aOther->mImmutable;
michael@0: 
michael@0:     if (mStoredFile) {
michael@0:       FileInfo* fileInfo;
michael@0: 
michael@0:       using mozilla::dom::indexedDB::IndexedDatabaseManager;
michael@0: 
michael@0:       if (IndexedDatabaseManager::IsClosed()) {
michael@0:         fileInfo = aOther->GetFileInfo();
michael@0:       }
michael@0:       else {
michael@0:         mozilla::MutexAutoLock lock(IndexedDatabaseManager::FileMutex());
michael@0:         fileInfo = aOther->GetFileInfo();
michael@0:       }
michael@0: 
michael@0:       mFileInfos.AppendElement(fileInfo);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   virtual already_AddRefed<nsIDOMBlob>
michael@0:   CreateSlice(uint64_t aStart, uint64_t aLength,
michael@0:               const nsAString& aContentType) MOZ_OVERRIDE;
michael@0: 
michael@0:   virtual bool IsStoredFile() const MOZ_OVERRIDE
michael@0:   {
michael@0:     return mStoredFile;
michael@0:   }
michael@0: 
michael@0:   virtual bool IsWholeFile() const MOZ_OVERRIDE
michael@0:   {
michael@0:     return mWholeFile;
michael@0:   }
michael@0: 
michael@0:   nsCOMPtr<nsIFile> mFile;
michael@0:   bool mWholeFile;
michael@0:   bool mStoredFile;
michael@0: };
michael@0: 
michael@0: /**
michael@0:  * This class may be used off the main thread, and in particular, its
michael@0:  * constructor and destructor may not run on the same thread.  Be careful!
michael@0:  */
michael@0: class nsDOMMemoryFile : public nsDOMFile
michael@0: {
michael@0: public:
michael@0:   // Create as file
michael@0:   nsDOMMemoryFile(void *aMemoryBuffer,
michael@0:                   uint64_t aLength,
michael@0:                   const nsAString& aName,
michael@0:                   const nsAString& aContentType)
michael@0:     : nsDOMFile(aName, aContentType, aLength, UINT64_MAX),
michael@0:       mDataOwner(new DataOwner(aMemoryBuffer, aLength))
michael@0:   {
michael@0:     NS_ASSERTION(mDataOwner && mDataOwner->mData, "must have data");
michael@0:   }
michael@0: 
michael@0:   // Create as blob
michael@0:   nsDOMMemoryFile(void *aMemoryBuffer,
michael@0:                   uint64_t aLength,
michael@0:                   const nsAString& aContentType)
michael@0:     : nsDOMFile(aContentType, aLength),
michael@0:       mDataOwner(new DataOwner(aMemoryBuffer, aLength))
michael@0:   {
michael@0:     NS_ASSERTION(mDataOwner && mDataOwner->mData, "must have data");
michael@0:   }
michael@0: 
michael@0:   NS_IMETHOD GetInternalStream(nsIInputStream**) MOZ_OVERRIDE;
michael@0: 
michael@0:   NS_IMETHOD_(bool) IsMemoryFile(void) MOZ_OVERRIDE;
michael@0: 
michael@0: protected:
michael@0:   // Create slice
michael@0:   nsDOMMemoryFile(const nsDOMMemoryFile* aOther, uint64_t aStart,
michael@0:                   uint64_t aLength, const nsAString& aContentType)
michael@0:     : nsDOMFile(aContentType, aOther->mStart + aStart, aLength),
michael@0:       mDataOwner(aOther->mDataOwner)
michael@0:   {
michael@0:     NS_ASSERTION(mDataOwner && mDataOwner->mData, "must have data");
michael@0:     mImmutable = aOther->mImmutable;
michael@0:   }
michael@0:   virtual already_AddRefed<nsIDOMBlob>
michael@0:   CreateSlice(uint64_t aStart, uint64_t aLength,
michael@0:               const nsAString& aContentType) MOZ_OVERRIDE;
michael@0: 
michael@0:   // These classes need to see DataOwner.
michael@0:   friend class DataOwnerAdapter;
michael@0:   friend class nsDOMMemoryFileDataOwnerMemoryReporter;
michael@0: 
michael@0:   class DataOwner MOZ_FINAL : public mozilla::LinkedListElement<DataOwner> {
michael@0:   public:
michael@0:     NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DataOwner)
michael@0:     DataOwner(void* aMemoryBuffer, uint64_t aLength)
michael@0:       : mData(aMemoryBuffer)
michael@0:       , mLength(aLength)
michael@0:     {
michael@0:       mozilla::StaticMutexAutoLock lock(sDataOwnerMutex);
michael@0: 
michael@0:       if (!sDataOwners) {
michael@0:         sDataOwners = new mozilla::LinkedList<DataOwner>();
michael@0:         EnsureMemoryReporterRegistered();
michael@0:       }
michael@0:       sDataOwners->insertBack(this);
michael@0:     }
michael@0: 
michael@0:   private:
michael@0:     // Private destructor, to discourage deletion outside of Release():
michael@0:     ~DataOwner() {
michael@0:       mozilla::StaticMutexAutoLock lock(sDataOwnerMutex);
michael@0: 
michael@0:       remove();
michael@0:       if (sDataOwners->isEmpty()) {
michael@0:         // Free the linked list if it's empty.
michael@0:         sDataOwners = nullptr;
michael@0:       }
michael@0: 
michael@0:       moz_free(mData);
michael@0:     }
michael@0: 
michael@0:   public:
michael@0:     static void EnsureMemoryReporterRegistered();
michael@0: 
michael@0:     // sDataOwners and sMemoryReporterRegistered may only be accessed while
michael@0:     // holding sDataOwnerMutex!  You also must hold the mutex while touching
michael@0:     // elements of the linked list that DataOwner inherits from.
michael@0:     static mozilla::StaticMutex sDataOwnerMutex;
michael@0:     static mozilla::StaticAutoPtr<mozilla::LinkedList<DataOwner> > sDataOwners;
michael@0:     static bool sMemoryReporterRegistered;
michael@0: 
michael@0:     void* mData;
michael@0:     uint64_t mLength;
michael@0:   };
michael@0: 
michael@0:   // Used when backed by a memory store
michael@0:   nsRefPtr<DataOwner> mDataOwner;
michael@0: };
michael@0: 
michael@0: class nsDOMFileList MOZ_FINAL : public nsIDOMFileList,
michael@0:                                 public nsWrapperCache
michael@0: {
michael@0: public:
michael@0:   nsDOMFileList(nsISupports *aParent) : mParent(aParent)
michael@0:   {
michael@0:     SetIsDOMBinding();
michael@0:   }
michael@0: 
michael@0:   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
michael@0:   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsDOMFileList)
michael@0: 
michael@0:   NS_DECL_NSIDOMFILELIST
michael@0: 
michael@0:   virtual JSObject* WrapObject(JSContext *cx) MOZ_OVERRIDE;
michael@0: 
michael@0:   nsISupports* GetParentObject()
michael@0:   {
michael@0:     return mParent;
michael@0:   }
michael@0: 
michael@0:   void Disconnect()
michael@0:   {
michael@0:     mParent = nullptr;
michael@0:   }
michael@0: 
michael@0:   bool Append(nsIDOMFile *aFile) { return mFiles.AppendObject(aFile); }
michael@0: 
michael@0:   bool Remove(uint32_t aIndex) { return mFiles.RemoveObjectAt(aIndex); }
michael@0:   void Clear() { return mFiles.Clear(); }
michael@0: 
michael@0:   static nsDOMFileList* FromSupports(nsISupports* aSupports)
michael@0:   {
michael@0: #ifdef DEBUG
michael@0:     {
michael@0:       nsCOMPtr<nsIDOMFileList> list_qi = do_QueryInterface(aSupports);
michael@0: 
michael@0:       // If this assertion fires the QI implementation for the object in
michael@0:       // question doesn't use the nsIDOMFileList pointer as the nsISupports
michael@0:       // pointer. That must be fixed, or we'll crash...
michael@0:       NS_ASSERTION(list_qi == static_cast<nsIDOMFileList*>(aSupports),
michael@0:                    "Uh, fix QI!");
michael@0:     }
michael@0: #endif
michael@0: 
michael@0:     return static_cast<nsDOMFileList*>(aSupports);
michael@0:   }
michael@0: 
michael@0:   nsIDOMFile* Item(uint32_t aIndex)
michael@0:   {
michael@0:     return mFiles.SafeObjectAt(aIndex);
michael@0:   }
michael@0:   nsIDOMFile* IndexedGetter(uint32_t aIndex, bool& aFound)
michael@0:   {
michael@0:     aFound = aIndex < static_cast<uint32_t>(mFiles.Count());
michael@0:     return aFound ? mFiles.ObjectAt(aIndex) : nullptr;
michael@0:   }
michael@0:   uint32_t Length()
michael@0:   {
michael@0:     return mFiles.Count();
michael@0:   }
michael@0: 
michael@0: private:
michael@0:   nsCOMArray<nsIDOMFile> mFiles;
michael@0:   nsISupports *mParent;
michael@0: };
michael@0: 
michael@0: class MOZ_STACK_CLASS nsDOMFileInternalUrlHolder {
michael@0: public:
michael@0:   nsDOMFileInternalUrlHolder(nsIDOMBlob* aFile, nsIPrincipal* aPrincipal
michael@0:                              MOZ_GUARD_OBJECT_NOTIFIER_PARAM);
michael@0:   ~nsDOMFileInternalUrlHolder();
michael@0:   nsAutoString mUrl;
michael@0: private:
michael@0:   MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
michael@0: };
michael@0: // This class would take the ownership of aFD and the caller must not close it.
michael@0: class nsDOMTemporaryFileBlob : public nsDOMFile
michael@0: {
michael@0: public:
michael@0:   nsDOMTemporaryFileBlob(PRFileDesc* aFD, uint64_t aStartPos, uint64_t aLength,
michael@0:                          const nsAString& aContentType)
michael@0:     : nsDOMFile(aContentType, aLength),
michael@0:       mLength(aLength),
michael@0:       mStartPos(aStartPos),
michael@0:       mContentType(aContentType)
michael@0:   {
michael@0:     mFileDescOwner = new nsTemporaryFileInputStream::FileDescOwner(aFD);
michael@0:   }
michael@0: 
michael@0:   ~nsDOMTemporaryFileBlob() { }
michael@0:   NS_IMETHOD GetInternalStream(nsIInputStream**) MOZ_OVERRIDE;
michael@0: 
michael@0: protected:
michael@0:   nsDOMTemporaryFileBlob(const nsDOMTemporaryFileBlob* aOther, uint64_t aStart, uint64_t aLength,
michael@0:                          const nsAString& aContentType)
michael@0:     : nsDOMFile(aContentType, aLength),
michael@0:       mLength(aLength),
michael@0:       mStartPos(aStart),
michael@0:       mFileDescOwner(aOther->mFileDescOwner),
michael@0:       mContentType(aContentType) { }
michael@0: 
michael@0:   virtual already_AddRefed<nsIDOMBlob>
michael@0:   CreateSlice(uint64_t aStart, uint64_t aLength,
michael@0:               const nsAString& aContentType) MOZ_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:   uint64_t mLength;
michael@0:   uint64_t mStartPos;
michael@0:   nsRefPtr<nsTemporaryFileInputStream::FileDescOwner> mFileDescOwner;
michael@0:   nsString mContentType;
michael@0: };
michael@0: 
michael@0: #endif