DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (1aeaa33a64f9)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189
/* -*- 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 "mozilla/dom/WorkerHolder.h"

#include "nsIAsyncInputStream.h"
#include "nsIInterfaceRequestor.h"
#include "nsINamed.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsWeakReference.h"

#define NS_PROGRESS_EVENT_INTERVAL 50

class nsITimer;
class nsIEventTarget;

namespace mozilla {
namespace dom {

class Blob;
class DOMException;
class WorkerPrivate;

extern const uint64_t kUnknownSize;

class FileReaderDecreaseBusyCounter;

class FileReader final : public DOMEventTargetHelper,
                         public nsIInterfaceRequestor,
                         public nsSupportsWeakReference,
                         public nsIInputStreamCallback,
                         public nsITimerCallback,
                         public nsINamed,
                         public WorkerHolder {
  friend class FileReaderDecreaseBusyCounter;

 public:
  FileReader(nsIGlobalObject* aGlobal, WorkerPrivate* aWorkerPrivate);

  NS_DECL_ISUPPORTS_INHERITED

  NS_DECL_NSITIMERCALLBACK
  NS_DECL_NSIINPUTSTREAMCALLBACK
  NS_DECL_NSIINTERFACEREQUESTOR
  NS_DECL_NSINAMED

  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 Optional<nsAString>& aLabel,
                  ErrorResult& aRv) {
    if (aLabel.WasPassed()) {
      ReadFileContent(aBlob, aLabel.Value(), FILE_AS_TEXT, aRv);
    } else {
      ReadFileContent(aBlob, EmptyString(), FILE_AS_TEXT, aRv);
    }
  }

  void ReadAsDataURL(Blob& aBlob, ErrorResult& aRv) {
    ReadFileContent(aBlob, EmptyString(), 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, 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(WorkerStatus) 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<DOMException> mError;

  eReadyState mReadyState;

  uint64_t mTotal;
  uint64_t mTransferred;

  nsCOMPtr<nsIEventTarget> mTarget;

  uint64_t mBusyCount;

  // Kept alive with a WorkerHolder.
  WorkerPrivate* mWorkerPrivate;
};

}  // namespace dom
}  // namespace mozilla

#endif  // mozilla_dom_FileReader_h