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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/DOMEventTargetHelper.h"
#include "nsCOMPtr.h"
#include "nsIAsyncInputStream.h"
#include "nsIInterfaceRequestor.h"
#include "nsINamed.h"
#include "nsITimer.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_INLINE_DECL_STATIC_IID(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;
};
} // namespace mozilla::dom
#endif // mozilla_dom_FileReader_h
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