/* -*- 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/. */

#include "nsLayoutStylesheetCache.h"

#include "nsAppDirectoryServiceDefs.h"

#include "mozilla/StyleSheetInlines.h"

#include "mozilla/MemoryReporting.h"

#include "mozilla/Omnijar.h"

#include "mozilla/Preferences.h"

#include "mozilla/StyleSheet.h"

#include "mozilla/StyleSheetInlines.h"

#include "mozilla/Telemetry.h"

#include "mozilla/css/Loader.h"

#include "mozilla/dom/SRIMetadata.h"

#include "MainThreadUtils.h"

#include "nsColor.h"

#include "nsDirectoryServiceDefs.h"

#include "nsDirectoryService.h"

#include "nsExceptionHandler.h"

#include "nsIChromeRegistry.h"

#include "nsIConsoleService.h"

#include "nsIFile.h"

#include "nsIObserverService.h"

#include "nsISimpleEnumerator.h"

#include "nsISubstitutingProtocolHandler.h"

#include "nsIXULRuntime.h"

#include "nsNetUtil.h"

#include "nsPresContext.h"

#include "nsPrintfCString.h"

#include "nsServiceManagerUtils.h"

#include "nsXULAppAPI.h"

#include "nsZipArchive.h"

#include "zlib.h"

using namespace mozilla;

using namespace mozilla::css;

NS_IMPL_ISUPPORTS(

  nsLayoutStylesheetCache, nsIObserver, nsIMemoryReporter)

nsresult

nsLayoutStylesheetCache::Observe(nsISupports* aSubject,

                            const char* aTopic,

                            const char16_t* aData)

{

  if (!strcmp(aTopic, "profile-before-change")) {

    mUserContentSheet = nullptr;

    mUserChromeSheet  = nullptr;

  }

  else if (!strcmp(aTopic, "profile-do-change")) {

    InitFromProfile();

  }

  else if (strcmp(aTopic, "chrome-flush-skin-caches") == 0 ||

           strcmp(aTopic, "chrome-flush-caches") == 0) {

    mScrollbarsSheet = nullptr;

    mFormsSheet = nullptr;

  }

  else {

    MOZ_ASSERT_UNREACHABLE("Unexpected observer topic.");

  }

  return NS_OK;

}

StyleSheet*

nsLayoutStylesheetCache::ScrollbarsSheet()

{

  if (!mScrollbarsSheet) {

    // Scrollbars don't need access to unsafe rules

    LoadSheetURL("chrome://global/skin/scrollbars.css",

                 &mScrollbarsSheet, eSafeAgentSheetFeatures, eCrash);

  }

  return mScrollbarsSheet;

}

StyleSheet*

nsLayoutStylesheetCache::FormsSheet()

{

  if (!mFormsSheet) {

    // forms.css needs access to unsafe rules

    LoadSheetURL("resource://gre-resources/forms.css",

                 &mFormsSheet, eAgentSheetFeatures, eCrash);

  }

  return mFormsSheet;

}

StyleSheet*

nsLayoutStylesheetCache::UserContentSheet()

{

  return mUserContentSheet;

}

StyleSheet*

nsLayoutStylesheetCache::UserChromeSheet()

{

  return mUserChromeSheet;

}

StyleSheet*

nsLayoutStylesheetCache::UASheet()

{

  if (!mUASheet) {

    LoadSheetURL("resource://gre-resources/ua.css",

                 &mUASheet, eAgentSheetFeatures, eCrash);

  }

  return mUASheet;

}

StyleSheet*

nsLayoutStylesheetCache::HTMLSheet()

{

  return mHTMLSheet;

}

StyleSheet*

nsLayoutStylesheetCache::MinimalXULSheet()

{

  return mMinimalXULSheet;

}

StyleSheet*

nsLayoutStylesheetCache::XULSheet()

{

  if (!mXULSheet) {

    LoadSheetURL("chrome://global/content/xul.css",

                 &mXULSheet, eAgentSheetFeatures, eCrash);

  }

  return mXULSheet;

}

StyleSheet*

nsLayoutStylesheetCache::XULComponentsSheet()

{

  if (!mXULComponentsSheet) {

    LoadSheetURL("chrome://global/content/components.css",

                 &mXULComponentsSheet, eAgentSheetFeatures, eCrash);

  }

  return mXULComponentsSheet;

}

StyleSheet*

nsLayoutStylesheetCache::QuirkSheet()

{

  return mQuirkSheet;

}

StyleSheet*

nsLayoutStylesheetCache::SVGSheet()

{

  return mSVGSheet;

}

StyleSheet*

nsLayoutStylesheetCache::MathMLSheet()

{

  if (!mMathMLSheet) {

    LoadSheetURL("resource://gre-resources/mathml.css",

                 &mMathMLSheet, eAgentSheetFeatures, eCrash);

  }

  return mMathMLSheet;

}

StyleSheet*

nsLayoutStylesheetCache::CounterStylesSheet()

{

  return mCounterStylesSheet;

}

StyleSheet*

nsLayoutStylesheetCache::NoScriptSheet()

{

  if (!mNoScriptSheet) {

    LoadSheetURL("resource://gre-resources/noscript.css",

                 &mNoScriptSheet, eAgentSheetFeatures, eCrash);

  }

  return mNoScriptSheet;

}

StyleSheet*

nsLayoutStylesheetCache::NoFramesSheet()

{

  if (!mNoFramesSheet) {

    LoadSheetURL("resource://gre-resources/noframes.css",

                 &mNoFramesSheet, eAgentSheetFeatures, eCrash);

  }

  return mNoFramesSheet;

}

StyleSheet*

nsLayoutStylesheetCache::ChromePreferenceSheet(nsPresContext* aPresContext)

{

  if (!mChromePreferenceSheet) {

    BuildPreferenceSheet(&mChromePreferenceSheet, aPresContext);

  }

  return mChromePreferenceSheet;

}

StyleSheet*

nsLayoutStylesheetCache::ContentPreferenceSheet(nsPresContext* aPresContext)

{

  if (!mContentPreferenceSheet) {

    BuildPreferenceSheet(&mContentPreferenceSheet, aPresContext);

  }

  return mContentPreferenceSheet;

}

StyleSheet*

nsLayoutStylesheetCache::ContentEditableSheet()

{

  if (!mContentEditableSheet) {

    LoadSheetURL("resource://gre/res/contenteditable.css",

                 &mContentEditableSheet, eAgentSheetFeatures, eCrash);

  }

  return mContentEditableSheet;

}

StyleSheet*

nsLayoutStylesheetCache::DesignModeSheet()

{

  if (!mDesignModeSheet) {

    LoadSheetURL("resource://gre/res/designmode.css",

                 &mDesignModeSheet, eAgentSheetFeatures, eCrash);

  }

  return mDesignModeSheet;

}

void

nsLayoutStylesheetCache::Shutdown()

{

  gCSSLoader = nullptr;

  NS_WARNING_ASSERTION(!gStyleCache || !gUserContentSheetURL,

                       "Got the URL but never used?");

  gStyleCache = nullptr;

  gUserContentSheetURL = nullptr;

}

void

nsLayoutStylesheetCache::SetUserContentCSSURL(nsIURI* aURI)

{

  MOZ_ASSERT(XRE_IsContentProcess(), "Only used in content processes.");

  gUserContentSheetURL = aURI;

}

MOZ_DEFINE_MALLOC_SIZE_OF(LayoutStylesheetCacheMallocSizeOf)

NS_IMETHODIMP

nsLayoutStylesheetCache::CollectReports(nsIHandleReportCallback* aHandleReport,

                                        nsISupports* aData, bool aAnonymize)

{

  MOZ_COLLECT_REPORT(

    "explicit/layout/style-sheet-cache", KIND_HEAP, UNITS_BYTES,

    SizeOfIncludingThis(LayoutStylesheetCacheMallocSizeOf),

    "Memory used for some built-in style sheets.");

  return NS_OK;

}

size_t

nsLayoutStylesheetCache::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const

{

  size_t n = aMallocSizeOf(this);

  #define MEASURE(s) n += s ? s->SizeOfIncludingThis(aMallocSizeOf) : 0;

  MEASURE(mChromePreferenceSheet);

  MEASURE(mContentEditableSheet);

  MEASURE(mContentPreferenceSheet);

  MEASURE(mCounterStylesSheet);

  MEASURE(mDesignModeSheet);

  MEASURE(mFormsSheet);

  MEASURE(mHTMLSheet);

  MEASURE(mMathMLSheet);

  MEASURE(mMinimalXULSheet);

  MEASURE(mNoFramesSheet);

  MEASURE(mNoScriptSheet);

  MEASURE(mQuirkSheet);

  MEASURE(mSVGSheet);

  MEASURE(mScrollbarsSheet);

  MEASURE(mUASheet);

  MEASURE(mUserChromeSheet);

  MEASURE(mUserContentSheet);

  MEASURE(mXULSheet);

  MEASURE(mXULComponentsSheet);

  // Measurement of the following members may be added later if DMD finds it is

  // worthwhile:

  // - gCSSLoader

  return n;

}

nsLayoutStylesheetCache::nsLayoutStylesheetCache()

{

  nsCOMPtr<nsIObserverService> obsSvc =

    mozilla::services::GetObserverService();

  NS_ASSERTION(obsSvc, "No global observer service?");

  if (obsSvc) {

    obsSvc->AddObserver(this, "profile-before-change", false);

    obsSvc->AddObserver(this, "profile-do-change", false);

    obsSvc->AddObserver(this, "chrome-flush-skin-caches", false);

    obsSvc->AddObserver(this, "chrome-flush-caches", false);

  }

  InitFromProfile();

  // And make sure that we load our UA sheets.  No need to do this

  // per-profile, since they're profile-invariant.

  LoadSheetURL("resource://gre-resources/counterstyles.css",

               &mCounterStylesSheet, eAgentSheetFeatures, eCrash);

  LoadSheetURL("resource://gre-resources/html.css",

               &mHTMLSheet, eAgentSheetFeatures, eCrash);

  LoadSheetURL("chrome://global/content/minimal-xul.css",

               &mMinimalXULSheet, eAgentSheetFeatures, eCrash);

  LoadSheetURL("resource://gre-resources/quirk.css",

               &mQuirkSheet, eAgentSheetFeatures, eCrash);

  LoadSheetURL("resource://gre/res/svg.css",

               &mSVGSheet, eAgentSheetFeatures, eCrash);

  if (XRE_IsParentProcess()) {

    // We know we need xul.css for the UI, so load that now too:

    XULSheet();

    XULComponentsSheet();

  }

  if (gUserContentSheetURL) {

    MOZ_ASSERT(XRE_IsContentProcess(), "Only used in content processes.");

    LoadSheet(gUserContentSheetURL, &mUserContentSheet,

              eUserSheetFeatures, eLogToConsole);

    gUserContentSheetURL = nullptr;

  }

  // The remaining sheets are created on-demand do to their use being rarer

  // (which helps save memory for Firefox OS apps) or because they need to

  // be re-loadable in DependentPrefChanged.

}

nsLayoutStylesheetCache::~nsLayoutStylesheetCache()

{

  mozilla::UnregisterWeakMemoryReporter(this);

}

void

nsLayoutStylesheetCache::InitMemoryReporter()

{

  mozilla::RegisterWeakMemoryReporter(this);

}

/* static */ nsLayoutStylesheetCache*

nsLayoutStylesheetCache::Singleton()

{

  MOZ_ASSERT(NS_IsMainThread());

  if (!gStyleCache) {

    gStyleCache = new nsLayoutStylesheetCache;

    gStyleCache->InitMemoryReporter();

    // For each pref that controls a CSS feature that a UA style sheet depends

    // on (such as a pref that enables a property that a UA style sheet uses),

    // register DependentPrefChanged as a callback to ensure that the relevant

    // style sheets will be re-parsed.

    // Preferences::RegisterCallback(&DependentPrefChanged,

    //                               "layout.css.example-pref.enabled");

  }

  return gStyleCache;

}

void

nsLayoutStylesheetCache::InitFromProfile()

{

  nsCOMPtr<nsIXULRuntime> appInfo = do_GetService("@mozilla.org/xre/app-info;1");

  if (appInfo) {

    bool inSafeMode = false;

    appInfo->GetInSafeMode(&inSafeMode);

    if (inSafeMode)

      return;

  }

  nsCOMPtr<nsIFile> contentFile;

  nsCOMPtr<nsIFile> chromeFile;

  NS_GetSpecialDirectory(NS_APP_USER_CHROME_DIR,

                         getter_AddRefs(contentFile));

  if (!contentFile) {

    // if we don't have a profile yet, that's OK!

    return;

  }

  contentFile->Clone(getter_AddRefs(chromeFile));

  if (!chromeFile) return;

  contentFile->Append(NS_LITERAL_STRING("userContent.css"));

  chromeFile->Append(NS_LITERAL_STRING("userChrome.css"));

  LoadSheetFile(contentFile, &mUserContentSheet, eUserSheetFeatures, eLogToConsole);

  LoadSheetFile(chromeFile, &mUserChromeSheet, eUserSheetFeatures, eLogToConsole);

  if (XRE_IsParentProcess()) {

    // We're interested specifically in potential chrome customizations,

    // so we only need data points from the parent process

    Telemetry::Accumulate(Telemetry::USER_CHROME_CSS_LOADED, mUserChromeSheet != nullptr);

  }

}

void

nsLayoutStylesheetCache::LoadSheetURL(const char* aURL,

                                      RefPtr<StyleSheet>* aSheet,

                                      SheetParsingMode aParsingMode,

                                      FailureAction aFailureAction)

{

  nsCOMPtr<nsIURI> uri;

  NS_NewURI(getter_AddRefs(uri), aURL);

  LoadSheet(uri, aSheet, aParsingMode, aFailureAction);

  if (!aSheet) {

    NS_ERROR(nsPrintfCString("Could not load %s", aURL).get());

  }

}

void

nsLayoutStylesheetCache::LoadSheetFile(nsIFile* aFile,

                                       RefPtr<StyleSheet>* aSheet,

                                       SheetParsingMode aParsingMode,

                                       FailureAction aFailureAction)

{

  bool exists = false;

  aFile->Exists(&exists);

  if (!exists) return;

  nsCOMPtr<nsIURI> uri;

  NS_NewFileURI(getter_AddRefs(uri), aFile);

  LoadSheet(uri, aSheet, aParsingMode, aFailureAction);

}

static inline nsresult

ComputeCRC32(nsIFile* aFile, uint32_t* aResult)

{

  PRFileDesc* fd;

  nsresult rv = aFile->OpenNSPRFileDesc(PR_RDONLY, 0, &fd);

  NS_ENSURE_SUCCESS(rv, rv);

  uint32_t crc = crc32(0, nullptr, 0);

  unsigned char buf[512];

  int32_t n;

  while ((n = PR_Read(fd, buf, sizeof(buf))) > 0) {

    crc = crc32(crc, buf, n);

  }

  PR_Close(fd);

  if (n < 0) {

    return NS_ERROR_FAILURE;

  }

  *aResult = crc;

  return NS_OK;

}

static void

ListInterestingFiles(nsString& aAnnotation, nsIFile* aFile,

                     const nsTArray<nsString>& aInterestingFilenames)

{

  nsString filename;

  aFile->GetLeafName(filename);

  for (const nsString& interestingFilename : aInterestingFilenames) {

    if (interestingFilename == filename) {

      nsString path;

      aFile->GetPath(path);

      aAnnotation.AppendLiteral("  ");

      aAnnotation.Append(path);

      aAnnotation.AppendLiteral(" (");

      int64_t size;

      if (NS_SUCCEEDED(aFile->GetFileSize(&size))) {

        aAnnotation.AppendPrintf("%" PRId64, size);

      } else {

        aAnnotation.AppendLiteral("???");

      }

      aAnnotation.AppendLiteral(" bytes, crc32 = ");

      uint32_t crc;

      nsresult rv = ComputeCRC32(aFile, &crc);

      if (NS_SUCCEEDED(rv)) {

        aAnnotation.AppendPrintf("0x%08x)\n", crc);

      } else {

        aAnnotation.AppendPrintf("error 0x%08x)\n", uint32_t(rv));

      }

      return;

    }

  }

  bool isDir = false;

  aFile->IsDirectory(&isDir);

  if (!isDir) {

    return;

  }

  nsCOMPtr<nsIDirectoryEnumerator> entries;

  if (NS_FAILED(aFile->GetDirectoryEntries(getter_AddRefs(entries)))) {

    aAnnotation.AppendLiteral("  (failed to enumerated directory)\n");

    return;

  }

  for (;;) {

    nsCOMPtr<nsIFile> file;

    if (NS_FAILED(entries->GetNextFile(getter_AddRefs(file)))) {

      aAnnotation.AppendLiteral("  (failed during directory enumeration)\n");

      return;

    }

    if (!file) {

      break;

    }

    ListInterestingFiles(aAnnotation, file, aInterestingFilenames);

  }

}

// Generate a crash report annotation to help debug issues with style

// sheets failing to load (bug 1194856).

static void

AnnotateCrashReport(nsIURI* aURI)

{

  nsAutoCString spec;

  nsAutoCString scheme;

  nsDependentCSubstring filename;

  if (aURI) {

    spec = aURI->GetSpecOrDefault();

    aURI->GetScheme(scheme);

    int32_t i = spec.RFindChar('/');

    if (i != -1) {

      filename.Rebind(spec, i + 1);

    }

  }

  nsString annotation;

  // The URL of the sheet that failed to load.

  annotation.AppendLiteral("Error loading sheet: ");

  annotation.Append(NS_ConvertUTF8toUTF16(spec).get());

  annotation.Append('\n');

  annotation.AppendLiteral("NS_ERROR_FILE_CORRUPTION reason: ");

  if (nsZipArchive::sFileCorruptedReason) {

    annotation.Append(NS_ConvertUTF8toUTF16(nsZipArchive::sFileCorruptedReason).get());

    annotation.Append('\n');

  } else {

    annotation.AppendLiteral("(none)\n");

  }

  // The jar: or file: URL that the sheet's resource: or chrome: URL

  // resolves to.

  if (scheme.EqualsLiteral("resource")) {

    annotation.AppendLiteral("Real location: ");

    nsCOMPtr<nsISubstitutingProtocolHandler> handler;

    nsCOMPtr<nsIIOService> io(do_GetIOService());

    if (io) {

      nsCOMPtr<nsIProtocolHandler> ph;

      io->GetProtocolHandler(scheme.get(), getter_AddRefs(ph));

      if (ph) {

        handler = do_QueryInterface(ph);

      }

    }

    if (!handler) {

      annotation.AppendLiteral("(ResolveURI failed)\n");

    } else {

      nsAutoCString resolvedSpec;

      nsresult rv = handler->ResolveURI(aURI, resolvedSpec);

      if (NS_FAILED(rv)) {

        annotation.AppendPrintf("(ResolveURI failed with 0x%08" PRIx32 ")\n",

                                static_cast<uint32_t>(rv));

      }

      annotation.Append(NS_ConvertUTF8toUTF16(resolvedSpec));

      annotation.Append('\n');

    }

  } else if (scheme.EqualsLiteral("chrome")) {

    annotation.AppendLiteral("Real location: ");

    nsCOMPtr<nsIChromeRegistry> reg =

      mozilla::services::GetChromeRegistryService();

    if (!reg) {

      annotation.AppendLiteral("(no chrome registry)\n");

    } else {

      nsCOMPtr<nsIURI> resolvedURI;

      reg->ConvertChromeURL(aURI, getter_AddRefs(resolvedURI));

      if (!resolvedURI) {

        annotation.AppendLiteral("(ConvertChromeURL failed)\n");

      } else {

        annotation.Append(

          NS_ConvertUTF8toUTF16(resolvedURI->GetSpecOrDefault()));

        annotation.Append('\n');

      }

    }

  }

  nsTArray<nsString> interestingFiles;

  interestingFiles.AppendElement(NS_LITERAL_STRING("chrome.manifest"));

  interestingFiles.AppendElement(NS_LITERAL_STRING("omni.ja"));

  interestingFiles.AppendElement(NS_ConvertUTF8toUTF16(filename));

  annotation.AppendLiteral("GRE directory: ");

  nsCOMPtr<nsIFile> file;

  nsDirectoryService::gService->Get(NS_GRE_DIR, NS_GET_IID(nsIFile),

                                    getter_AddRefs(file));

  if (file) {

    // The Firefox installation directory.

    nsString path;

    file->GetPath(path);

    annotation.Append(path);

    annotation.Append('\n');

    // List interesting files -- any chrome.manifest or omni.ja file or any file

    // whose name is the sheet's filename -- under the Firefox installation

    // directory.

    annotation.AppendLiteral("Interesting files in the GRE directory:\n");

    ListInterestingFiles(annotation, file, interestingFiles);

    // If the Firefox installation directory has a chrome.manifest file, let's

    // see what's in it.

    file->Append(NS_LITERAL_STRING("chrome.manifest"));

    bool exists = false;

    file->Exists(&exists);

    if (exists) {

      annotation.AppendLiteral("Contents of chrome.manifest:\n[[[\n");

      PRFileDesc* fd;

      if (NS_SUCCEEDED(file->OpenNSPRFileDesc(PR_RDONLY, 0, &fd))) {

        nsCString contents;

        char buf[512];

        int32_t n;

        while ((n = PR_Read(fd, buf, sizeof(buf))) > 0) {

          contents.Append(buf, n);

        }

        if (n < 0) {

          annotation.AppendLiteral("  (error while reading)\n");

        } else {

          annotation.Append(NS_ConvertUTF8toUTF16(contents));

        }

        PR_Close(fd);

      }

      annotation.AppendLiteral("]]]\n");

    }

  } else {

    annotation.AppendLiteral("(none)\n");

  }

  // The jar: or file: URL prefix that chrome: and resource: URLs get translated

  // to.

  annotation.AppendLiteral("GRE omnijar URI string: ");

  nsCString uri;

  nsresult rv = Omnijar::GetURIString(Omnijar::GRE, uri);

  if (NS_FAILED(rv)) {

    annotation.AppendLiteral("(failed)\n");

  } else {

    annotation.Append(NS_ConvertUTF8toUTF16(uri));

    annotation.Append('\n');

  }

  RefPtr<nsZipArchive> zip = Omnijar::GetReader(Omnijar::GRE);

  if (zip) {

    // List interesting files in the GRE omnijar.

    annotation.AppendLiteral("Interesting files in the GRE omnijar:\n");

    nsZipFind* find;

    rv = zip->FindInit(nullptr, &find);

    if (NS_FAILED(rv)) {

      annotation.AppendPrintf("  (FindInit failed with 0x%08" PRIx32 ")\n",

                              static_cast<uint32_t>(rv));

    } else if (!find) {

      annotation.AppendLiteral("  (FindInit returned null)\n");

    } else {

      const char* result;

      uint16_t len;

      while (NS_SUCCEEDED(find->FindNext(&result, &len))) {

        nsCString itemPathname;

        nsString itemFilename;

        itemPathname.Append(result, len);

        int32_t i = itemPathname.RFindChar('/');

        if (i != -1) {

          itemFilename = NS_ConvertUTF8toUTF16(Substring(itemPathname, i + 1));

        }

        for (const nsString& interestingFile : interestingFiles) {

          if (interestingFile == itemFilename) {

            annotation.AppendLiteral("  ");

            annotation.Append(NS_ConvertUTF8toUTF16(itemPathname));

            nsZipItem* item = zip->GetItem(itemPathname.get());

            if (!item) {

              annotation.AppendLiteral(" (GetItem failed)\n");

            } else {

              annotation.AppendPrintf(" (%d bytes, crc32 = 0x%08x)\n",

                                      item->RealSize(),

                                      item->CRC32());

            }

            break;

          }

        }

      }

      delete find;

    }

  } else {

    annotation.AppendLiteral("No GRE omnijar\n");

  }

  CrashReporter::AnnotateCrashReport(

    CrashReporter::Annotation::SheetLoadFailure,

    NS_ConvertUTF16toUTF8(annotation));

}

static void

ErrorLoadingSheet(nsIURI* aURI, const char* aMsg, FailureAction aFailureAction)

{

  nsPrintfCString errorMessage("%s loading built-in stylesheet '%s'",

                               aMsg,

                               aURI ? aURI->GetSpecOrDefault().get() : "");

  if (aFailureAction == eLogToConsole) {

    nsCOMPtr<nsIConsoleService> cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID);

    if (cs) {

      cs->LogStringMessage(NS_ConvertUTF8toUTF16(errorMessage).get());

      return;

    }

  }

  AnnotateCrashReport(aURI);

  MOZ_CRASH_UNSAFE_OOL(errorMessage.get());

}

void

nsLayoutStylesheetCache::LoadSheet(nsIURI* aURI,

                                   RefPtr<StyleSheet>* aSheet,

                                   SheetParsingMode aParsingMode,

                                   FailureAction aFailureAction)

{

  if (!aURI) {

    ErrorLoadingSheet(aURI, "null URI", eCrash);

    return;

  }

  if (!gCSSLoader) {

    gCSSLoader = new Loader;

    if (!gCSSLoader) {

      ErrorLoadingSheet(aURI, "no Loader", eCrash);

      return;

    }

  }

  nsZipArchive::sFileCorruptedReason = nullptr;

  // Note: The parallel parsing code assume that UA sheets are always loaded

  // synchronously like they are here, and thus that we'll never attempt

  // parallel parsing on them. If that ever changes, we'll either need to find a

  // different way to prohibit parallel parsing for UA sheets, or handle

  // -moz-bool-pref and various other things in the parallel parsing code.

  nsresult rv = gCSSLoader->LoadSheetSync(aURI, aParsingMode, true, aSheet);

  if (NS_FAILED(rv)) {

    ErrorLoadingSheet(aURI,

      nsPrintfCString("LoadSheetSync failed with error %" PRIx32, static_cast<uint32_t>(rv)).get(),

      aFailureAction);

  }

}

/* static */ void

nsLayoutStylesheetCache::InvalidatePreferenceSheets()

{

  if (gStyleCache) {

    gStyleCache->mContentPreferenceSheet = nullptr;

    gStyleCache->mChromePreferenceSheet = nullptr;

  }

}

void

nsLayoutStylesheetCache::BuildPreferenceSheet(RefPtr<StyleSheet>* aSheet,

                                              nsPresContext* aPresContext)

{

  *aSheet = new StyleSheet(eAgentSheetFeatures,

                           CORS_NONE,

                           mozilla::net::RP_Unset,

                           dom::SRIMetadata());

  StyleSheet* sheet = *aSheet;

  nsCOMPtr<nsIURI> uri;

  NS_NewURI(getter_AddRefs(uri), "about:PreferenceStyleSheet", nullptr);

  MOZ_ASSERT(uri, "URI creation shouldn't fail");

  sheet->SetURIs(uri, uri, uri);

  sheet->SetComplete();

  static const uint32_t kPreallocSize = 1024;

  nsCString sheetText;

  sheetText.SetCapacity(kPreallocSize);

#define NS_GET_R_G_B(color_) \

  NS_GET_R(color_), NS_GET_G(color_), NS_GET_B(color_)

  sheetText.AppendLiteral(

      "@namespace url(http://www.w3.org/1999/xhtml);\n"

      "@namespace svg url(http://www.w3.org/2000/svg);\n");

  // Rules for link styling.

  nscolor linkColor = aPresContext->DefaultLinkColor();

  nscolor activeColor = aPresContext->DefaultActiveLinkColor();

  nscolor visitedColor = aPresContext->DefaultVisitedLinkColor();

  sheetText.AppendPrintf(

      "*|*:link { color: #%02x%02x%02x; }\n"

      "*|*:any-link:active { color: #%02x%02x%02x; }\n"

      "*|*:visited { color: #%02x%02x%02x; }\n",

      NS_GET_R_G_B(linkColor),

      NS_GET_R_G_B(activeColor),

      NS_GET_R_G_B(visitedColor));

  bool underlineLinks =

    aPresContext->GetCachedBoolPref(kPresContext_UnderlineLinks);

  sheetText.AppendPrintf(

      "*|*:any-link%s { text-decoration: %s; }\n",

      underlineLinks ? ":not(svg|a)" : "",

      underlineLinks ? "underline" : "none");

  // Rules for focus styling.

  bool focusRingOnAnything = aPresContext->GetFocusRingOnAnything();

  uint8_t focusRingWidth = aPresContext->FocusRingWidth();

  uint8_t focusRingStyle = aPresContext->GetFocusRingStyle();

  if ((focusRingWidth != 1 && focusRingWidth <= 4) || focusRingOnAnything) {

    if (focusRingWidth != 1) {

      // If the focus ring width is different from the default, fix buttons

      // with rings.

      sheetText.AppendPrintf(

          "button::-moz-focus-inner, input[type=\"reset\"]::-moz-focus-inner, "

          "input[type=\"button\"]::-moz-focus-inner, "

          "input[type=\"submit\"]::-moz-focus-inner { "

          "border: %dpx %s transparent !important; }\n",

          focusRingWidth,

          focusRingStyle == 0 ? "solid" : "dotted");

      sheetText.AppendLiteral(

          "button:focus::-moz-focus-inner, "

          "input[type=\"reset\"]:focus::-moz-focus-inner, "

          "input[type=\"button\"]:focus::-moz-focus-inner, "

          "input[type=\"submit\"]:focus::-moz-focus-inner { "

          "border-color: ButtonText !important; }\n");

    }

    sheetText.AppendPrintf(

        "%s { outline: %dpx %s !important; %s}\n",

        focusRingOnAnything ?

          ":focus" :

          "*|*:link:focus, *|*:visited:focus",

        focusRingWidth,

        focusRingStyle == 0 ? // solid

          "solid -moz-mac-focusring" : "dotted WindowText",

        focusRingStyle == 0 ? // solid

          "-moz-outline-radius: 3px; outline-offset: 1px; " : "");

  }

  if (aPresContext->GetUseFocusColors()) {

    nscolor focusText = aPresContext->FocusTextColor();

    nscolor focusBG = aPresContext->FocusBackgroundColor();

    sheetText.AppendPrintf(

        "*:focus, *:focus > font { color: #%02x%02x%02x !important; "

        "background-color: #%02x%02x%02x !important; }\n",

        NS_GET_R_G_B(focusText),

        NS_GET_R_G_B(focusBG));

  }

  NS_ASSERTION(sheetText.Length() <= kPreallocSize,