1 files changed, 841 insertions, 0 deletions

diff --git a/image/decoders/icon/win/nsIconChannel.cpp b/image/decoders/icon/win/nsIconChannel.cpp
new file mode 100644
index 0000000000..9ddcbbc488
--- /dev/null
+++ b/image/decoders/icon/win/nsIconChannel.cpp
@@ -0,0 +1,841 @@
+/* -*- 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 "nsIOutputStream.h"
+#include "nsIPipe.h"
+#include "nsNetCID.h"
+#include "nsIFile.h"
+#include "nsIFileURL.h"
+#include "nsIMIMEService.h"
+#include "nsCExternalHandlerService.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsProxyRelease.h"
+#include "nsContentSecurityManager.h"
+#include "nsContentUtils.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)
+{
+  return aStockName.EqualsLiteral("uac-shield") ? SIID_SHIELD :
+                                                  SIID_INVALID;
+}
+
+// nsIconChannel methods
+nsIconChannel::nsIconChannel()
+{
+}
+
+nsIconChannel::~nsIconChannel()
+{
+  if (mLoadInfo) {
+    NS_ReleaseOnMainThread(mLoadInfo.forget());
+  }
+}
+
+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);
+}
+
+NS_IMETHODIMP
+nsIconChannel::Open2(nsIInputStream** aStream)
+{
+  nsCOMPtr<nsIStreamListener> listener;
+  nsresult rv = nsContentSecurityManager::doContentSecurityCheck(this, listener);
+  NS_ENSURE_SUCCESS(rv, rv);
+  return Open(aStream);
+}
+
+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)
+{
+  MOZ_ASSERT(!mLoadInfo ||
+             mLoadInfo->GetSecurityMode() == 0 ||
+             mLoadInfo->GetInitialSecurityCheckDone() ||
+             (mLoadInfo->GetSecurityMode() == nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL &&
+              nsContentUtils::IsSystemPrincipal(mLoadInfo->LoadingPrincipal())),
+             "security flags in loadInfo but asyncOpen2() not called");
+
+  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;
+}
+
+NS_IMETHODIMP
+nsIconChannel::AsyncOpen2(nsIStreamListener* aListener)
+{
+  nsCOMPtr<nsIStreamListener> listener = aListener;
+  nsresult rv = nsContentSecurityManager::doContentSecurityCheck(this, listener);
+  NS_ENSURE_SUCCESS(rv, rv);
+  return AsyncOpen(listener, nullptr);
+}
+
+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)
+{
+  return
+    (UINT) (aDesiredImageSize > 16 ? SHGFI_SHELLICONSIZE : SHGFI_SMALLICON);
+}
+
+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);
+  if (bmi) {
+    memcpy(bmi, aHeader, sizeof(BITMAPINFOHEADER));
+    memset(bmi->bmiColors, 0, aColorTableSize);
+  }
+  return bmi;
+}
+
+nsresult
+nsIconChannel::MakeInputStream(nsIInputStream** _retval, bool aNonBlocking)
+{
+  // 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;
+
+        UniquePtr<char[]> buffer = MakeUnique<char[]>(iconSize);
+        if (!buffer) {
+          rv = NS_ERROR_OUT_OF_MEMORY;
+        } else {
+          char* whereTo = buffer.get();
+          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, aNonBlocking);
+              if (NS_SUCCEEDED(rv)) {
+                uint32_t written;
+                rv = outStream->Write(buffer.get(), iconSize, &written);
+                if (NS_SUCCEEDED(rv)) {
+                  NS_ADDREF(*_retval = inStream);
+                }
+              }
+
+            } // if we got bitmap bits
+            delete maskInfo;
+          } // if we got mask bits
+          delete colorInfo;
+        } // 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 = 0;
+  return NS_ERROR_FAILURE;
+}
+
+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::GetLoadInfo(nsILoadInfo** aLoadInfo)
+{
+  NS_IF_ADDREF(*aLoadInfo = mLoadInfo);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsIconChannel::SetLoadInfo(nsILoadInfo* aLoadInfo)
+{
+  mLoadInfo = aLoadInfo;
+  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;
+}