layout/style/StreamLoader.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_css_StreamLoader_h
   8 #define mozilla_css_StreamLoader_h
   9
  10 #include "nsIStreamListener.h"
  11 #include "nsIThreadRetargetableStreamListener.h"
  12 #include "nsString.h"
  13 #include "mozilla/css/SheetLoadData.h"
  14 #include "mozilla/Assertions.h"
  15
  16 class nsIInputStream;
  17
  18 namespace mozilla::css {
  19
  20 class StreamLoader : public nsIStreamListener,
  21                      public nsIThreadRetargetableStreamListener {
  22  public:
  23   NS_DECL_THREADSAFE_ISUPPORTS
  24   NS_DECL_NSIREQUESTOBSERVER
  25   NS_DECL_NSISTREAMLISTENER
  26   NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER
  27
  28   explicit StreamLoader(SheetLoadData&);
  29
  30   void ChannelOpenFailed(nsresult rv) {
  31 #ifdef NIGHTLY_BUILD
  32     mChannelOpenFailed = true;
  33 #endif
  34   }
  35
  36  private:
  37   virtual ~StreamLoader();
  38
  39   /**
  40    * callback method used for ReadSegments
  41    */
  42   static nsresult WriteSegmentFun(nsIInputStream*, void*, const char*, uint32_t,
  43                                   uint32_t, uint32_t*);
  44
  45   void HandleBOM();
  46
  47   RefPtr<SheetLoadData> mSheetLoadData;
  48   nsresult mStatus;
  49   Maybe<const Encoding*> mEncodingFromBOM;
  50
  51   // We store the initial three bytes of the stream into mBOMBytes, and then
  52   // use that buffer to detect a BOM. We then shift any non-BOM bytes into
  53   // mBytes, and store all subsequent data in that buffer.
  54   nsCString mBytes;
  55   nsAutoCStringN<3> mBOMBytes;
  56
  57 #ifdef NIGHTLY_BUILD
  58   bool mChannelOpenFailed = false;
  59   bool mOnStopRequestCalled = false;
  60 #endif
  61 };
  62
  63 }  // namespace mozilla::css
  64
  65 #endif  // mozilla_css_StreamLoader_h