The Tor Browser: image/decoders/icon/win/nsIconChannel.cpp@ac0c01689b40 (annotated)

image/decoders/icon/win/nsIconChannel.cpp@ac0c01689b40 (annotated)

image/decoders/icon/win/nsIconChannel.cpp

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  *
  * 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/. */
 #include "mozilla/ArrayUtils.h"
 #include "nsIconChannel.h"
 #include "nsIIconURI.h"
 #include "nsIServiceManager.h"
 #include "nsIInterfaceRequestor.h"
 #include "nsIInterfaceRequestorUtils.h"
 #include "nsXPIDLString.h"
 #include "nsReadableUtils.h"
 #include "nsMimeTypes.h"
 #include "nsMemory.h"
 #include "nsIStringStream.h"
 #include "nsIURL.h"
 #include "nsNetUtil.h"
 #include "nsIFile.h"
 #include "nsIFileURL.h"
 #include "nsIMIMEService.h"
 #include "nsCExternalHandlerService.h"
 #include "nsDirectoryServiceDefs.h"
 #ifdef _WIN32_WINNT
 #undef _WIN32_WINNT
 #endif
 #define _WIN32_WINNT 0x0600
 // we need windows.h to read out registry information...
 #include <windows.h>
 #include <shellapi.h>
 #include <shlobj.h>
 #include <objbase.h>
 #include <wchar.h>
 using namespace mozilla;
 struct ICONFILEHEADER {
   uint16_t ifhReserved;
   uint16_t ifhType;
   uint16_t ifhCount;
 };
 struct ICONENTRY {
   int8_t ieWidth;
   int8_t ieHeight;
   uint8_t ieColors;
   uint8_t ieReserved;
   uint16_t iePlanes;
   uint16_t ieBitCount;
   uint32_t ieSizeImage;
   uint32_t ieFileOffset;
 };
 // Match stock icons with names
 static SHSTOCKICONID GetStockIconIDForName(const nsACString &aStockName)
 {
   // UAC shield icon
   if (aStockName == NS_LITERAL_CSTRING("uac-shield"))
     return SIID_SHIELD;
   return SIID_INVALID;
 }
 // nsIconChannel methods
 nsIconChannel::nsIconChannel()
 {
 }
 nsIconChannel::~nsIconChannel()
 {}
 NS_IMPL_ISUPPORTS(nsIconChannel,
                   nsIChannel,
                   nsIRequest,
                   nsIRequestObserver,
                   nsIStreamListener)
 nsresult nsIconChannel::Init(nsIURI* uri)
 {
   NS_ASSERTION(uri, "no uri");
   mUrl = uri;
   mOriginalURI = uri;
   nsresult rv;
   mPump = do_CreateInstance(NS_INPUTSTREAMPUMP_CONTRACTID, &rv);
   return rv;
 }
 ////////////////////////////////////////////////////////////////////////////////
 // nsIRequest methods:
 NS_IMETHODIMP nsIconChannel::GetName(nsACString &result)
 {
   return mUrl->GetSpec(result);
 }
 NS_IMETHODIMP nsIconChannel::IsPending(bool *result)
 {
   return mPump->IsPending(result);
 }
 NS_IMETHODIMP nsIconChannel::GetStatus(nsresult *status)
 {
   return mPump->GetStatus(status);
 }
 NS_IMETHODIMP nsIconChannel::Cancel(nsresult status)
 {
   return mPump->Cancel(status);
 }
 NS_IMETHODIMP nsIconChannel::Suspend(void)
 {
   return mPump->Suspend();
 }
 NS_IMETHODIMP nsIconChannel::Resume(void)
 {
   return mPump->Resume();
 }
 NS_IMETHODIMP nsIconChannel::GetLoadGroup(nsILoadGroup* *aLoadGroup)
 {
   *aLoadGroup = mLoadGroup;
   NS_IF_ADDREF(*aLoadGroup);
   return NS_OK;
 }
 NS_IMETHODIMP nsIconChannel::SetLoadGroup(nsILoadGroup* aLoadGroup)
 {
   mLoadGroup = aLoadGroup;
   return NS_OK;
 }
 NS_IMETHODIMP nsIconChannel::GetLoadFlags(uint32_t *aLoadAttributes)
 {
   return mPump->GetLoadFlags(aLoadAttributes);
 }
 NS_IMETHODIMP nsIconChannel::SetLoadFlags(uint32_t aLoadAttributes)
 {
   return mPump->SetLoadFlags(aLoadAttributes);
 }
 ////////////////////////////////////////////////////////////////////////////////
 // nsIChannel methods:
 NS_IMETHODIMP nsIconChannel::GetOriginalURI(nsIURI* *aURI)
 {
   *aURI = mOriginalURI;
   NS_ADDREF(*aURI);
   return NS_OK;
 }
 NS_IMETHODIMP nsIconChannel::SetOriginalURI(nsIURI* aURI)
 {
   NS_ENSURE_ARG_POINTER(aURI);
   mOriginalURI = aURI;
   return NS_OK;
 }
 NS_IMETHODIMP nsIconChannel::GetURI(nsIURI* *aURI)
 {
   *aURI = mUrl;
   NS_IF_ADDREF(*aURI);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsIconChannel::Open(nsIInputStream **_retval)
 {
   return MakeInputStream(_retval, false);
 }
 nsresult nsIconChannel::ExtractIconInfoFromUrl(nsIFile ** aLocalFile, uint32_t * aDesiredImageSize, nsCString &aContentType, nsCString &aFileExtension)
 {
   nsresult rv = NS_OK;
   nsCOMPtr<nsIMozIconURI> iconURI (do_QueryInterface(mUrl, &rv));
   NS_ENSURE_SUCCESS(rv, rv);
   iconURI->GetImageSize(aDesiredImageSize);
   iconURI->GetContentType(aContentType);
   iconURI->GetFileExtension(aFileExtension);
   nsCOMPtr<nsIURL> url;
   rv = iconURI->GetIconURL(getter_AddRefs(url));
   if (NS_FAILED(rv) || !url) return NS_OK;
   nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(url, &rv);
   if (NS_FAILED(rv) || !fileURL) return NS_OK;
   nsCOMPtr<nsIFile> file;
   rv = fileURL->GetFile(getter_AddRefs(file));
   if (NS_FAILED(rv) || !file) return NS_OK;
   return file->Clone(aLocalFile);
 }
 NS_IMETHODIMP nsIconChannel::AsyncOpen(nsIStreamListener *aListener, nsISupports *ctxt)
 {
   nsCOMPtr<nsIInputStream> inStream;
   nsresult rv = MakeInputStream(getter_AddRefs(inStream), true);
   if (NS_FAILED(rv))
     return rv;
   // Init our streampump
   rv = mPump->Init(inStream, int64_t(-1), int64_t(-1), 0, 0, false);
   if (NS_FAILED(rv))
     return rv;
   rv = mPump->AsyncRead(this, ctxt);
   if (NS_SUCCEEDED(rv)) {
     // Store our real listener
     mListener = aListener;
     // Add ourself to the load group, if available
     if (mLoadGroup)
       mLoadGroup->AddRequest(this, nullptr);
   }
   return rv;
 }
 static DWORD GetSpecialFolderIcon(nsIFile* aFile, int aFolder, SHFILEINFOW* aSFI, UINT aInfoFlags)
 {
   DWORD shellResult = 0;
   if (!aFile)
     return shellResult;
   wchar_t fileNativePath[MAX_PATH];
   nsAutoString fileNativePathStr;
   aFile->GetPath(fileNativePathStr);
   ::GetShortPathNameW(fileNativePathStr.get(), fileNativePath, ArrayLength(fileNativePath));
   LPITEMIDLIST idList;
   HRESULT hr = ::SHGetSpecialFolderLocation(nullptr, aFolder, &idList);
   if (SUCCEEDED(hr)) {
     wchar_t specialNativePath[MAX_PATH];
     ::SHGetPathFromIDListW(idList, specialNativePath);
     ::GetShortPathNameW(specialNativePath, specialNativePath, ArrayLength(specialNativePath));
     if (!wcsicmp(fileNativePath, specialNativePath)) {
       aInfoFlags |= (SHGFI_PIDL | SHGFI_SYSICONINDEX);
       shellResult = ::SHGetFileInfoW((LPCWSTR)(LPCITEMIDLIST)idList, 0, aSFI,
                                      sizeof(*aSFI), aInfoFlags);
     }
   }
   CoTaskMemFree(idList);
   return shellResult;
 }
 static UINT GetSizeInfoFlag(uint32_t aDesiredImageSize)
 {
   UINT infoFlag;
   if (aDesiredImageSize > 16)
     infoFlag = SHGFI_SHELLICONSIZE;
   else
     infoFlag = SHGFI_SMALLICON;
   return infoFlag;
 }
 nsresult nsIconChannel::GetHIconFromFile(HICON *hIcon)
 {
   nsXPIDLCString contentType;
   nsCString fileExt;
   nsCOMPtr<nsIFile> localFile; // file we want an icon for
   uint32_t desiredImageSize;
   nsresult rv = ExtractIconInfoFromUrl(getter_AddRefs(localFile), &desiredImageSize, contentType, fileExt);
   NS_ENSURE_SUCCESS(rv, rv);
   // if the file exists, we are going to use it's real attributes...otherwise we only want to use it for it's extension...
   SHFILEINFOW      sfi;
   UINT infoFlags = SHGFI_ICON;
   bool fileExists = false;
   nsAutoString filePath;
   CopyASCIItoUTF16(fileExt, filePath);
   if (localFile)
   {
     rv = localFile->Normalize();
     NS_ENSURE_SUCCESS(rv, rv);
     localFile->GetPath(filePath);
     if (filePath.Length() < 2 || filePath[1] != ':')
       return NS_ERROR_MALFORMED_URI; // UNC
     if (filePath.Last() == ':')
       filePath.Append('\\');
     else {
       localFile->Exists(&fileExists);
       if (!fileExists)
        localFile->GetLeafName(filePath);
     }
   }
   if (!fileExists)
    infoFlags |= SHGFI_USEFILEATTRIBUTES;
   infoFlags |= GetSizeInfoFlag(desiredImageSize);
   // if we have a content type... then use it! but for existing files, we want
   // to show their real icon.
   if (!fileExists && !contentType.IsEmpty())
   {
     nsCOMPtr<nsIMIMEService> mimeService (do_GetService(NS_MIMESERVICE_CONTRACTID, &rv));
     NS_ENSURE_SUCCESS(rv, rv);
     nsAutoCString defFileExt;
     mimeService->GetPrimaryExtension(contentType, fileExt, defFileExt);
     // If the mime service does not know about this mime type, we show
     // the generic icon.
     // In any case, we need to insert a '.' before the extension.
     filePath = NS_LITERAL_STRING(".") + NS_ConvertUTF8toUTF16(defFileExt);
   }
   // Is this the "Desktop" folder?
   DWORD shellResult = GetSpecialFolderIcon(localFile, CSIDL_DESKTOP, &sfi, infoFlags);
   if (!shellResult) {
     // Is this the "My Documents" folder?
     shellResult = GetSpecialFolderIcon(localFile, CSIDL_PERSONAL, &sfi, infoFlags);
   }
   // There are other "Special Folders" and Namespace entities that we are not
   // fetching icons for, see:
   // http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/shell/reference/enums/csidl.asp
   // If we ever need to get them, code to do so would be inserted here.
   // Not a special folder, or something else failed above.
   if (!shellResult)
     shellResult = ::SHGetFileInfoW(filePath.get(),
                                    FILE_ATTRIBUTE_ARCHIVE, &sfi, sizeof(sfi), infoFlags);
   if (shellResult && sfi.hIcon)
     *hIcon = sfi.hIcon;
   else
     rv = NS_ERROR_NOT_AVAILABLE;
   return rv;
 }
 nsresult nsIconChannel::GetStockHIcon(nsIMozIconURI *aIconURI, HICON *hIcon)
 {
   nsresult rv = NS_OK;
   // We can only do this on Vista or above
   HMODULE hShellDLL = ::LoadLibraryW(L"shell32.dll");
   decltype(SHGetStockIconInfo)* pSHGetStockIconInfo =
     (decltype(SHGetStockIconInfo)*) ::GetProcAddress(hShellDLL, "SHGetStockIconInfo");
   if (pSHGetStockIconInfo)
   {
     uint32_t desiredImageSize;
     aIconURI->GetImageSize(&desiredImageSize);
     nsAutoCString stockIcon;
     aIconURI->GetStockIcon(stockIcon);
     SHSTOCKICONID stockIconID = GetStockIconIDForName(stockIcon);
     if (stockIconID == SIID_INVALID)
       return NS_ERROR_NOT_AVAILABLE;
     UINT infoFlags = SHGSI_ICON;
     infoFlags |= GetSizeInfoFlag(desiredImageSize);
     SHSTOCKICONINFO sii = {0};
     sii.cbSize = sizeof(sii);
     HRESULT hr = pSHGetStockIconInfo(stockIconID, infoFlags, &sii);
     if (SUCCEEDED(hr))
       *hIcon = sii.hIcon;
     else
       rv = NS_ERROR_FAILURE;
   }
   else
   {
     rv = NS_ERROR_NOT_AVAILABLE;
   }
   if (hShellDLL)
     ::FreeLibrary(hShellDLL);
   return rv;
 }
 // Given a BITMAPINFOHEADER, returns the size of the color table.
 static int GetColorTableSize(BITMAPINFOHEADER* aHeader)
 {
   int colorTableSize = -1;
   // http://msdn.microsoft.com/en-us/library/dd183376%28v=VS.85%29.aspx
   switch (aHeader->biBitCount) {
   case 0:
     colorTableSize = 0;
     break;
   case 1:
     colorTableSize = 2 * sizeof(RGBQUAD);
     break;
   case 4:
   case 8:
   {
     // The maximum possible size for the color table is 2**bpp, so check for
     // that and fail if we're not in those bounds
     unsigned int maxEntries = 1 << (aHeader->biBitCount);
     if (aHeader->biClrUsed > 0 && aHeader->biClrUsed <= maxEntries)
       colorTableSize = aHeader->biClrUsed * sizeof(RGBQUAD);
     else if (aHeader->biClrUsed == 0)
       colorTableSize = maxEntries * sizeof(RGBQUAD);
     break;
   }
   case 16:
   case 32:
     // If we have BI_BITFIELDS compression, we would normally need 3 DWORDS for
     // the bitfields mask which would be stored in the color table; However,
     // we instead force the bitmap to request data of type BI_RGB so the color
     // table should be of size 0.
     // Setting aHeader->biCompression = BI_RGB forces the later call to
     // GetDIBits to return to us BI_RGB data.
     if (aHeader->biCompression == BI_BITFIELDS) {
       aHeader->biCompression = BI_RGB;
     }
     colorTableSize = 0;
     break;
   case 24:
     colorTableSize = 0;
     break;
   }
   if (colorTableSize < 0)
     NS_WARNING("Unable to figure out the color table size for this bitmap");
   return colorTableSize;
 }
 // Given a header and a size, creates a freshly allocated BITMAPINFO structure.
 // It is the caller's responsibility to null-check and delete the structure.
 static BITMAPINFO* CreateBitmapInfo(BITMAPINFOHEADER* aHeader,
                                     size_t aColorTableSize)
 {
   BITMAPINFO* bmi = (BITMAPINFO*) ::operator new(sizeof(BITMAPINFOHEADER) +
                                                  aColorTableSize,
                                                  mozilla::fallible_t());
   if (bmi) {
     memcpy(bmi, aHeader, sizeof(BITMAPINFOHEADER));
     memset(bmi->bmiColors, 0, aColorTableSize);
   }
   return bmi;
 }
 nsresult nsIconChannel::MakeInputStream(nsIInputStream** _retval, bool nonBlocking)
 {
   // Check whether the icon requested's a file icon or a stock icon
   nsresult rv = NS_ERROR_NOT_AVAILABLE;
   // GetDIBits does not exist on windows mobile.
   HICON hIcon = nullptr;
   nsCOMPtr<nsIMozIconURI> iconURI(do_QueryInterface(mUrl, &rv));
   NS_ENSURE_SUCCESS(rv, rv);
   nsAutoCString stockIcon;
   iconURI->GetStockIcon(stockIcon);
   if (!stockIcon.IsEmpty())
     rv = GetStockHIcon(iconURI, &hIcon);
   else
     rv = GetHIconFromFile(&hIcon);
   NS_ENSURE_SUCCESS(rv, rv);
   if (hIcon)
   {
     // we got a handle to an icon. Now we want to get a bitmap for the icon using GetIconInfo....
     ICONINFO iconInfo;
     if (GetIconInfo(hIcon, &iconInfo))
     {
       // we got the bitmaps, first find out their size
       HDC hDC = CreateCompatibleDC(nullptr); // get a device context for the screen.
       BITMAPINFOHEADER maskHeader  = {sizeof(BITMAPINFOHEADER)};
       BITMAPINFOHEADER colorHeader = {sizeof(BITMAPINFOHEADER)};
       int colorTableSize, maskTableSize;
       if (GetDIBits(hDC, iconInfo.hbmMask,  0, 0, nullptr, (BITMAPINFO*)&maskHeader,  DIB_RGB_COLORS) &&
           GetDIBits(hDC, iconInfo.hbmColor, 0, 0, nullptr, (BITMAPINFO*)&colorHeader, DIB_RGB_COLORS) &&
           maskHeader.biHeight == colorHeader.biHeight &&
           maskHeader.biWidth  == colorHeader.biWidth  &&
           colorHeader.biBitCount > 8 &&
           colorHeader.biSizeImage > 0 &&
           colorHeader.biWidth >= 0 && colorHeader.biWidth <= 255 &&
           colorHeader.biHeight >= 0 && colorHeader.biHeight <= 255 &&
           maskHeader.biSizeImage > 0  &&
           (colorTableSize = GetColorTableSize(&colorHeader)) >= 0 &&
           (maskTableSize  = GetColorTableSize(&maskHeader))  >= 0) {
         uint32_t iconSize = sizeof(ICONFILEHEADER) +
                             sizeof(ICONENTRY) +
                             sizeof(BITMAPINFOHEADER) +
                             colorHeader.biSizeImage +
                             maskHeader.biSizeImage;
         char *buffer = new char[iconSize];
         if (!buffer)
           rv = NS_ERROR_OUT_OF_MEMORY;
         else {
           char *whereTo = buffer;
           int howMuch;
           // the data starts with an icon file header
           ICONFILEHEADER iconHeader;
           iconHeader.ifhReserved = 0;
           iconHeader.ifhType = 1;
           iconHeader.ifhCount = 1;
           howMuch = sizeof(ICONFILEHEADER);
           memcpy(whereTo, &iconHeader, howMuch);
           whereTo += howMuch;
           // followed by the single icon entry
           ICONENTRY iconEntry;
           iconEntry.ieWidth = static_cast<int8_t>(colorHeader.biWidth);
           iconEntry.ieHeight = static_cast<int8_t>(colorHeader.biHeight);
           iconEntry.ieColors = 0;
           iconEntry.ieReserved = 0;
           iconEntry.iePlanes = 1;
           iconEntry.ieBitCount = colorHeader.biBitCount;
           iconEntry.ieSizeImage = sizeof(BITMAPINFOHEADER) +
                                   colorHeader.biSizeImage +
                                   maskHeader.biSizeImage;
           iconEntry.ieFileOffset = sizeof(ICONFILEHEADER) + sizeof(ICONENTRY);
           howMuch = sizeof(ICONENTRY);
           memcpy(whereTo, &iconEntry, howMuch);
           whereTo += howMuch;
           // followed by the bitmap info header
           // (doubling the height because icons have two bitmaps)
           colorHeader.biHeight *= 2;
           colorHeader.biSizeImage += maskHeader.biSizeImage;
           howMuch = sizeof(BITMAPINFOHEADER);
           memcpy(whereTo, &colorHeader, howMuch);
           whereTo += howMuch;
           colorHeader.biHeight /= 2;
           colorHeader.biSizeImage -= maskHeader.biSizeImage;
           // followed by the XOR bitmap data (colorHeader)
           // (you'd expect the color table to come here, but it apparently doesn't)
           BITMAPINFO* colorInfo = CreateBitmapInfo(&colorHeader, colorTableSize);
           if (colorInfo && GetDIBits(hDC, iconInfo.hbmColor, 0,
                                      colorHeader.biHeight, whereTo, colorInfo,
                                      DIB_RGB_COLORS)) {
             whereTo += colorHeader.biSizeImage;
             // and finally the AND bitmap data (maskHeader)
             BITMAPINFO* maskInfo = CreateBitmapInfo(&maskHeader, maskTableSize);
             if (maskInfo && GetDIBits(hDC, iconInfo.hbmMask, 0,
                                       maskHeader.biHeight, whereTo, maskInfo,
                                       DIB_RGB_COLORS)) {
               // Now, create a pipe and stuff our data into it
               nsCOMPtr<nsIInputStream> inStream;
               nsCOMPtr<nsIOutputStream> outStream;
               rv = NS_NewPipe(getter_AddRefs(inStream), getter_AddRefs(outStream),
                               iconSize, iconSize, nonBlocking);
               if (NS_SUCCEEDED(rv)) {
                 uint32_t written;
                 rv = outStream->Write(buffer, iconSize, &written);
                 if (NS_SUCCEEDED(rv)) {
                   NS_ADDREF(*_retval = inStream);
                 }
               }
             } // if we got bitmap bits
             delete maskInfo;
           } // if we got mask bits
           delete colorInfo;
           delete [] buffer;
         } // if we allocated the buffer
       } // if we got mask size
       DeleteDC(hDC);
       DeleteObject(iconInfo.hbmColor);
       DeleteObject(iconInfo.hbmMask);
     } // if we got icon info
     DestroyIcon(hIcon);
   } // if we got an hIcon
   // If we didn't make a stream, then fail.
   if (!*_retval && NS_SUCCEEDED(rv))
     rv = NS_ERROR_NOT_AVAILABLE;
   return rv;
 }
 NS_IMETHODIMP nsIconChannel::GetContentType(nsACString &aContentType)
 {
   aContentType.AssignLiteral(IMAGE_ICO);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsIconChannel::SetContentType(const nsACString &aContentType)
 {
   // It doesn't make sense to set the content-type on this type
   // of channel...
   return NS_ERROR_FAILURE;
 }
 NS_IMETHODIMP nsIconChannel::GetContentCharset(nsACString &aContentCharset)
 {
   aContentCharset.Truncate();
   return NS_OK;
 }
 NS_IMETHODIMP
 nsIconChannel::SetContentCharset(const nsACString &aContentCharset)
 {
   // It doesn't make sense to set the content-charset on this type
   // of channel...
   return NS_ERROR_FAILURE;
 }
 NS_IMETHODIMP
 nsIconChannel::GetContentDisposition(uint32_t *aContentDisposition)
 {
   return NS_ERROR_NOT_AVAILABLE;
 }
 NS_IMETHODIMP
 nsIconChannel::SetContentDisposition(uint32_t aContentDisposition)
 {
   return NS_ERROR_NOT_AVAILABLE;
 }
 NS_IMETHODIMP
 nsIconChannel::GetContentDispositionFilename(nsAString &aContentDispositionFilename)
 {
   return NS_ERROR_NOT_AVAILABLE;
 }
 NS_IMETHODIMP
 nsIconChannel::SetContentDispositionFilename(const nsAString &aContentDispositionFilename)
 {
   return NS_ERROR_NOT_AVAILABLE;
 }
 NS_IMETHODIMP
 nsIconChannel::GetContentDispositionHeader(nsACString &aContentDispositionHeader)
 {
   return NS_ERROR_NOT_AVAILABLE;
 }
 NS_IMETHODIMP nsIconChannel::GetContentLength(int64_t *aContentLength)
 {
   *aContentLength = mContentLength;
   return NS_OK;
 }
 NS_IMETHODIMP nsIconChannel::SetContentLength(int64_t aContentLength)
 {
   NS_NOTREACHED("nsIconChannel::SetContentLength");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP nsIconChannel::GetOwner(nsISupports* *aOwner)
 {
   *aOwner = mOwner.get();
   NS_IF_ADDREF(*aOwner);
   return NS_OK;
 }
 NS_IMETHODIMP nsIconChannel::SetOwner(nsISupports* aOwner)
 {
   mOwner = aOwner;
   return NS_OK;
 }
 NS_IMETHODIMP nsIconChannel::GetNotificationCallbacks(nsIInterfaceRequestor* *aNotificationCallbacks)
 {
   *aNotificationCallbacks = mCallbacks.get();
   NS_IF_ADDREF(*aNotificationCallbacks);
   return NS_OK;
 }
 NS_IMETHODIMP nsIconChannel::SetNotificationCallbacks(nsIInterfaceRequestor* aNotificationCallbacks)
 {
   mCallbacks = aNotificationCallbacks;
   return NS_OK;
 }
 NS_IMETHODIMP nsIconChannel::GetSecurityInfo(nsISupports * *aSecurityInfo)
 {
   *aSecurityInfo = nullptr;
   return NS_OK;
 }
 // nsIRequestObserver methods
 NS_IMETHODIMP nsIconChannel::OnStartRequest(nsIRequest* aRequest, nsISupports* aContext)
 {
   if (mListener)
     return mListener->OnStartRequest(this, aContext);
   return NS_OK;
 }
 NS_IMETHODIMP nsIconChannel::OnStopRequest(nsIRequest* aRequest, nsISupports* aContext, nsresult aStatus)
 {
   if (mListener) {
     mListener->OnStopRequest(this, aContext, aStatus);
     mListener = nullptr;
   }
   // Remove from load group
   if (mLoadGroup)
     mLoadGroup->RemoveRequest(this, nullptr, aStatus);
   // Drop notification callbacks to prevent cycles.
   mCallbacks = nullptr;
   return NS_OK;
 }
 // nsIStreamListener methods
 NS_IMETHODIMP nsIconChannel::OnDataAvailable(nsIRequest* aRequest,
                                              nsISupports* aContext,
                                              nsIInputStream* aStream,
                                              uint64_t aOffset,
                                              uint32_t aCount)
 {
   if (mListener)
     return mListener->OnDataAvailable(this, aContext, aStream, aOffset, aCount);
   return NS_OK;
 }

The Tor Browser / annotate

image/decoders/icon/win/nsIconChannel.cpp@ac0c01689b40 (annotated)

image/decoders/icon/win/nsIconChannel.cpp