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-rw-r--r--dom/file/FileReader.h207
1 files changed, 207 insertions, 0 deletions
diff --git a/dom/file/FileReader.h b/dom/file/FileReader.h
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+/* -*- 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 "nsINamed.h"
+#include "nsITimer.h"
+#include "nsCOMPtr.h"
+#include "nsString.h"
+#include "nsWeakReference.h"
+
+#define NS_PROGRESS_EVENT_INTERVAL 50
+
+class nsITimer;
+class nsIEventTarget;
+
+namespace mozilla::dom {
+
+class Blob;
+class DOMException;
+class OwningStringOrArrayBuffer;
+class StrongWorkerRef;
+class WeakWorkerRef;
+
+extern const uint64_t kUnknownSize;
+
+class FileReaderDecreaseBusyCounter;
+
+// 26a79031-c94b-47e9-850a-f04fe17bc026
+#define FILEREADER_ID \
+ { \
+ 0x26a79031, 0xc94b, 0x47e9, { \
+ 0x85, 0x0a, 0xf0, 0x4f, 0xe1, 0x7b, 0xc0, 0x26 \
+ } \
+ }
+
+class FileReader final : public DOMEventTargetHelper,
+ public nsIInterfaceRequestor,
+ public nsSupportsWeakReference,
+ public nsIInputStreamCallback,
+ public nsITimerCallback,
+ public nsINamed {
+ friend class FileReaderDecreaseBusyCounter;
+
+ public:
+ FileReader(nsIGlobalObject* aGlobal, WeakWorkerRef* aWorkerRef);
+
+ NS_DECL_ISUPPORTS_INHERITED
+
+ NS_DECL_NSITIMERCALLBACK
+ NS_DECL_NSIINPUTSTREAMCALLBACK
+ NS_DECL_NSIINTERFACEREQUESTOR
+ NS_DECL_NSINAMED
+
+ NS_DECLARE_STATIC_IID_ACCESSOR(FILEREADER_ID)
+
+ NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(FileReader,
+ DOMEventTargetHelper)
+
+ JSObject* WrapObject(JSContext* aCx,
+ JS::Handle<JSObject*> aGivenProto) override;
+
+ // WebIDL
+ static already_AddRefed<FileReader> Constructor(const GlobalObject& aGlobal);
+ void ReadAsArrayBuffer(JSContext* aCx, Blob& aBlob, ErrorResult& aRv) {
+ ReadFileContent(aBlob, u""_ns, FILE_AS_ARRAYBUFFER, aRv);
+ }
+
+ void ReadAsText(Blob& aBlob, const Optional<nsAString>& aLabel,
+ ErrorResult& aRv) {
+ if (aLabel.WasPassed()) {
+ ReadFileContent(aBlob, aLabel.Value(), FILE_AS_TEXT, aRv);
+ } else {
+ ReadFileContent(aBlob, u""_ns, FILE_AS_TEXT, aRv);
+ }
+ }
+
+ void ReadAsDataURL(Blob& aBlob, ErrorResult& aRv) {
+ ReadFileContent(aBlob, u""_ns, FILE_AS_DATAURL, aRv);
+ }
+
+ void Abort();
+
+ uint16_t ReadyState() const { return static_cast<uint16_t>(mReadyState); }
+
+ DOMException* GetError() const { return mError; }
+
+ void GetResult(JSContext* aCx, Nullable<OwningStringOrArrayBuffer>& aResult);
+
+ 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, u""_ns, FILE_AS_BINARY, aRv);
+ }
+
+ enum eDataFormat {
+ FILE_AS_ARRAYBUFFER,
+ FILE_AS_BINARY,
+ FILE_AS_TEXT,
+ FILE_AS_DATAURL
+ };
+
+ eDataFormat DataFormat() const { return mDataFormat; }
+ const nsString& Result() const { return mResult; }
+
+ void InitialAsyncWait();
+
+ private:
+ ~FileReader() override;
+
+ // This must be in sync with dom/webidl/FileReader.webidl
+ enum eReadyState { EMPTY = 0, LOADING = 1, DONE = 2 };
+
+ 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);
+
+ void 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();
+
+ nsresult IncreaseBusyCounter();
+ void DecreaseBusyCounter();
+
+ void Cleanup();
+ 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<DOMException> mError;
+
+ eReadyState mReadyState;
+
+ uint64_t mTotal;
+ uint64_t mTransferred;
+
+ nsCOMPtr<nsIEventTarget> mTarget;
+
+ uint64_t mBusyCount;
+
+ // This is set if FileReader is created on workers, but it is null if the
+ // worker is shutting down. The null value is checked in ReadFileContent()
+ // before starting any reading.
+ RefPtr<WeakWorkerRef> mWeakWorkerRef;
+
+ // This value is set when the reading starts in order to keep the worker alive
+ // during the process.
+ RefPtr<StrongWorkerRef> mStrongWorkerRef;
+
+ // Runnable to start the reading asynchronous.
+ class AsyncWaitRunnable;
+ RefPtr<AsyncWaitRunnable> mAsyncWaitRunnable;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(FileReader, FILEREADER_ID)
+
+} // namespace mozilla::dom
+
+#endif // mozilla_dom_FileReader_h