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 "nsString.h"
  12 #include "mozilla/css/SheetLoadData.h"
  13 #include "mozilla/Assertions.h"
  14
  15 class nsIInputStream;
  16
  17 namespace mozilla {
  18 namespace css {
  19
  20 class StreamLoader : public nsIStreamListener {
  21  public:
  22   NS_DECL_ISUPPORTS
  23   NS_DECL_NSIREQUESTOBSERVER
  24   NS_DECL_NSISTREAMLISTENER
  25
  26   explicit StreamLoader(SheetLoadData&);
  27
  28   void ChannelOpenFailed(nsresult rv) {
  29 #ifdef NIGHTLY_BUILD
  30     mChannelOpenFailed = true;
  31 #endif
  32   }
  33
  34  private:
  35   virtual ~StreamLoader();
  36
  37   /**
  38    * callback method used for ReadSegments
  39    */
  40   static nsresult WriteSegmentFun(nsIInputStream*, void*, const char*, uint32_t,
  41                                   uint32_t, uint32_t*);
  42
  43   void HandleBOM();
  44
  45   RefPtr<SheetLoadData> mSheetLoadData;
  46   nsresult mStatus;
  47   Maybe<const Encoding*> mEncodingFromBOM;
  48
  49   // We store the initial three bytes of the stream into mBOMBytes, and then
  50   // use that buffer to detect a BOM. We then shift any non-BOM bytes into
  51   // mBytes, and store all subsequent data in that buffer.
  52   nsCString mBytes;
  53   nsAutoCStringN<3> mBOMBytes;
  54
  55 #ifdef NIGHTLY_BUILD
  56   bool mChannelOpenFailed = false;
  57   bool mOnStopRequestCalled = false;
  58 #endif
  59 };
  60
  61 }  // namespace css
  62 }  // namespace mozilla
  63
  64 #endif  // mozilla_css_StreamLoader_h