import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/base/FileReader.h

@@ -0,0 +1,202 @@
+/* -*- 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_FileReader_h
+#define mozilla_dom_FileReader_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/DOMEventTargetHelper.h"
+
+#include "nsIAsyncInputStream.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsCOMPtr.h"
+#include "nsString.h"
+#include "nsWeakReference.h"
+#include "WorkerHolder.h"
+
+#define NS_PROGRESS_EVENT_INTERVAL 50
+
+class nsITimer;
+class nsIEventTarget;
+
+namespace mozilla {
+namespace dom {
+
+class Blob;
+class DOMError;
+
+namespace workers {
+class WorkerPrivate;
+}
+
+extern const uint64_t kUnknownSize;
+
+class FileReaderDecreaseBusyCounter;
+
+class FileReader final : public DOMEventTargetHelper,
+                         public nsIInterfaceRequestor,
+                         public nsSupportsWeakReference,
+                         public nsIInputStreamCallback,
+                         public nsITimerCallback,
+                         public workers::WorkerHolder
+{
+  friend class FileReaderDecreaseBusyCounter;
+
+public:
+  FileReader(nsIGlobalObject* aGlobal,
+             workers::WorkerPrivate* aWorkerPrivate);
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  NS_DECL_NSITIMERCALLBACK
+  NS_DECL_NSIINPUTSTREAMCALLBACK
+  NS_DECL_NSIINTERFACEREQUESTOR
+
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(FileReader,
+                                                         DOMEventTargetHelper)
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  // WebIDL
+  static already_AddRefed<FileReader>
+  Constructor(const GlobalObject& aGlobal, ErrorResult& aRv);
+  void ReadAsArrayBuffer(JSContext* aCx, Blob& aBlob, ErrorResult& aRv)
+  {
+    ReadFileContent(aBlob, EmptyString(), FILE_AS_ARRAYBUFFER, aRv);
+  }
+
+  void ReadAsText(Blob& aBlob, const nsAString& aLabel, ErrorResult& aRv)
+  {
+    ReadFileContent(aBlob, aLabel, FILE_AS_TEXT, aRv);
+  }
+
+  void ReadAsDataURL(Blob& aBlob, ErrorResult& aRv)
+  {
+    ReadFileContent(aBlob, EmptyString(), FILE_AS_DATAURL, aRv);
+  }
+
+  void Abort(ErrorResult& aRv);
+
+  uint16_t ReadyState() const
+  {
+    return static_cast<uint16_t>(mReadyState);
+  }
+
+  DOMError* GetError() const
+  {
+    return mError;
+  }
+
+  void GetResult(JSContext* aCx, JS::MutableHandle<JS::Value> aResult,
+                 ErrorResult& aRv);
+
+  IMPL_EVENT_HANDLER(loadstart)
+  IMPL_EVENT_HANDLER(progress)
+  IMPL_EVENT_HANDLER(load)
+  IMPL_EVENT_HANDLER(abort)
+  IMPL_EVENT_HANDLER(error)
+  IMPL_EVENT_HANDLER(loadend)
+
+  void ReadAsBinaryString(Blob& aBlob, ErrorResult& aRv)
+  {
+    ReadFileContent(aBlob, EmptyString(), FILE_AS_BINARY, aRv);
+  }
+
+  // WorkerHolder
+  bool Notify(workers::Status) override;
+
+private:
+  virtual ~FileReader();
+
+  // This must be in sync with dom/webidl/FileReader.webidl
+  enum eReadyState {
+    EMPTY = 0,
+    LOADING = 1,
+    DONE = 2
+  };
+
+  enum eDataFormat {
+    FILE_AS_ARRAYBUFFER,
+    FILE_AS_BINARY,
+    FILE_AS_TEXT,
+    FILE_AS_DATAURL
+  };
+
+  void RootResultArrayBuffer();
+
+  void ReadFileContent(Blob& aBlob,
+                       const nsAString &aCharset, eDataFormat aDataFormat,
+                       ErrorResult& aRv);
+  nsresult GetAsText(Blob *aBlob, const nsACString &aCharset,
+                     const char *aFileData, uint32_t aDataLen,
+                     nsAString &aResult);
+  nsresult GetAsDataURL(Blob *aBlob, const char *aFileData,
+                        uint32_t aDataLen, nsAString &aResult);
+
+  nsresult OnLoadEnd(nsresult aStatus);
+
+  void StartProgressEventTimer();
+  void ClearProgressEventTimer();
+
+  void FreeDataAndDispatchSuccess();
+  void FreeDataAndDispatchError();
+  void FreeDataAndDispatchError(nsresult aRv);
+  nsresult DispatchProgressEvent(const nsAString& aType);
+
+  nsresult DoAsyncWait();
+  nsresult DoReadData(uint64_t aCount);
+
+  void OnLoadEndArrayBuffer();
+
+  void FreeFileData()
+  {
+    free(mFileData);
+    mFileData = nullptr;
+    mDataLen = 0;
+  }
+
+  nsresult IncreaseBusyCounter();
+  void DecreaseBusyCounter();
+
+  void Shutdown();
+
+  char *mFileData;
+  RefPtr<Blob> mBlob;
+  nsCString mCharset;
+  uint32_t mDataLen;
+
+  eDataFormat mDataFormat;
+
+  nsString mResult;
+
+  JS::Heap<JSObject*> mResultArrayBuffer;
+
+  nsCOMPtr<nsITimer> mProgressNotifier;
+  bool mProgressEventWasDelayed;
+  bool mTimerIsActive;
+
+  nsCOMPtr<nsIAsyncInputStream> mAsyncStream;
+
+  RefPtr<DOMError> mError;
+
+  eReadyState mReadyState;
+
+  uint64_t mTotal;
+  uint64_t mTransferred;
+
+  nsCOMPtr<nsIEventTarget> mTarget;
+
+  uint64_t mBusyCount;
+
+  // Kept alive with a WorkerHolder.
+  workers::WorkerPrivate* mWorkerPrivate;
+};
+
+} // dom namespace
+} // mozilla namespace
+
+#endif // mozilla_dom_FileReader_h