The Tor Browser: content/base/src/nsDOMFile.cpp@deefc01c0e14 (annotated)

content/base/src/nsDOMFile.cpp@deefc01c0e14 (annotated)

content/base/src/nsDOMFile.cpp

Thu, 15 Jan 2015 21:03:48 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 21:03:48 +0100
branch: TOR_BUG_9701
changeset 11: deefc01c0e14
permissions: -rw-r--r--

Integrate friendly tips from Tor colleagues to make (or not) 4.5 alpha 3;
This includes removal of overloaded (but unused) methods, and addition of
a overlooked call to DataStruct::SetData(nsISupports, uint32_t, bool.)

 /* -*- Mode: C++; tab-width: 2; 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 "nsDOMFile.h"
 #include "nsCExternalHandlerService.h"
 #include "nsContentCID.h"
 #include "nsContentUtils.h"
 #include "nsDOMClassInfoID.h"
 #include "nsError.h"
 #include "nsICharsetDetector.h"
 #include "nsIClassInfo.h"
 #include "nsIConverterInputStream.h"
 #include "nsIDocument.h"
 #include "nsIFileStreams.h"
 #include "nsIInputStream.h"
 #include "nsIIPCSerializableInputStream.h"
 #include "nsIMemoryReporter.h"
 #include "nsIMIMEService.h"
 #include "nsISeekableStream.h"
 #include "nsIUnicharInputStream.h"
 #include "nsIUnicodeDecoder.h"
 #include "nsNetCID.h"
 #include "nsNetUtil.h"
 #include "nsIUUIDGenerator.h"
 #include "nsHostObjectProtocolHandler.h"
 #include "nsStringStream.h"
 #include "nsJSUtils.h"
 #include "nsPrintfCString.h"
 #include "mozilla/SHA1.h"
 #include "mozilla/CheckedInt.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/Attributes.h"
 #include "nsThreadUtils.h"
 #include "mozilla/dom/FileListBinding.h"
 using namespace mozilla;
 using namespace mozilla::dom;
 // XXXkhuey the input stream that we pass out of a DOMFile
 // can outlive the actual DOMFile object.  Thus, we must
 // ensure that the buffer underlying the stream we get
 // from NS_NewByteInputStream is held alive as long as the
 // stream is.  We do that by passing back this class instead.
 class DataOwnerAdapter MOZ_FINAL : public nsIInputStream,
                                    public nsISeekableStream,
                                    public nsIIPCSerializableInputStream
 {
   typedef nsDOMMemoryFile::DataOwner DataOwner;
 public:
   static nsresult Create(DataOwner* aDataOwner,
                          uint32_t aStart,
                          uint32_t aLength,
                          nsIInputStream** _retval);
   NS_DECL_THREADSAFE_ISUPPORTS
   // These are mandatory.
   NS_FORWARD_NSIINPUTSTREAM(mStream->)
   NS_FORWARD_NSISEEKABLESTREAM(mSeekableStream->)
   // This is optional. We use a conditional QI to keep it from being called
   // if the underlying stream doesn't support it.
   NS_FORWARD_NSIIPCSERIALIZABLEINPUTSTREAM(mSerializableInputStream->)
 private:
   DataOwnerAdapter(DataOwner* aDataOwner,
                    nsIInputStream* aStream)
     : mDataOwner(aDataOwner), mStream(aStream),
       mSeekableStream(do_QueryInterface(aStream)),
       mSerializableInputStream(do_QueryInterface(aStream))
   {
     NS_ASSERTION(mSeekableStream, "Somebody gave us the wrong stream!");
   }
   nsRefPtr<DataOwner> mDataOwner;
   nsCOMPtr<nsIInputStream> mStream;
   nsCOMPtr<nsISeekableStream> mSeekableStream;
   nsCOMPtr<nsIIPCSerializableInputStream> mSerializableInputStream;
 };
 NS_IMPL_ADDREF(DataOwnerAdapter)
 NS_IMPL_RELEASE(DataOwnerAdapter)
 NS_INTERFACE_MAP_BEGIN(DataOwnerAdapter)
   NS_INTERFACE_MAP_ENTRY(nsIInputStream)
   NS_INTERFACE_MAP_ENTRY(nsISeekableStream)
   NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIIPCSerializableInputStream,
                                      mSerializableInputStream)
   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIInputStream)
 NS_INTERFACE_MAP_END
 nsresult DataOwnerAdapter::Create(DataOwner* aDataOwner,
                                   uint32_t aStart,
                                   uint32_t aLength,
                                   nsIInputStream** _retval)
 {
   nsresult rv;
   NS_ASSERTION(aDataOwner, "Uh ...");
   nsCOMPtr<nsIInputStream> stream;
   rv = NS_NewByteInputStream(getter_AddRefs(stream),
                              static_cast<const char*>(aDataOwner->mData) +
                              aStart,
                              (int32_t)aLength,
                              NS_ASSIGNMENT_DEPEND);
   NS_ENSURE_SUCCESS(rv, rv);
   NS_ADDREF(*_retval = new DataOwnerAdapter(aDataOwner, stream));
   return NS_OK;
 }
 ////////////////////////////////////////////////////////////////////////////
 // nsDOMFileBase implementation
 NS_IMETHODIMP
 nsDOMFileBase::GetName(nsAString &aFileName)
 {
   NS_ASSERTION(mIsFile, "Should only be called on files");
   aFileName = mName;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileBase::GetPath(nsAString &aPath)
 {
   NS_ASSERTION(mIsFile, "Should only be called on files");
   aPath = mPath;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileBase::GetLastModifiedDate(JSContext* cx, JS::MutableHandle<JS::Value> aLastModifiedDate)
 {
   JS::Rooted<JSObject*> date(cx, JS_NewDateObjectMsec(cx, JS_Now() / PR_USEC_PER_MSEC));
   if (!date) {
     return NS_ERROR_OUT_OF_MEMORY;
   }
   aLastModifiedDate.setObject(*date);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileBase::GetMozFullPath(nsAString &aFileName)
 {
   NS_ASSERTION(mIsFile, "Should only be called on files");
   // It is unsafe to call IsCallerChrome on a non-main thread. If
   // you hit the following assertion you need to figure out some other way to
   // determine privileges and call GetMozFullPathInternal.
   NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
   if (nsContentUtils::IsCallerChrome()) {
     return GetMozFullPathInternal(aFileName);
   }
   aFileName.Truncate();
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileBase::GetMozFullPathInternal(nsAString &aFileName)
 {
   if (!mIsFile) {
     return NS_ERROR_FAILURE;
   }
   aFileName.Truncate();
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileBase::GetSize(uint64_t *aSize)
 {
   *aSize = mLength;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileBase::GetType(nsAString &aType)
 {
   aType = mContentType;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileBase::GetMozLastModifiedDate(uint64_t* aLastModifiedDate)
 {
   NS_ASSERTION(mIsFile, "Should only be called on files");
   if (IsDateUnknown()) {
     mLastModificationDate = PR_Now();
   }
   *aLastModifiedDate = mLastModificationDate;
   return NS_OK;
 }
 // Makes sure that aStart and aEnd is less then or equal to aSize and greater
 // than 0
 static void
 ParseSize(int64_t aSize, int64_t& aStart, int64_t& aEnd)
 {
   CheckedInt64 newStartOffset = aStart;
   if (aStart < -aSize) {
     newStartOffset = 0;
   }
   else if (aStart < 0) {
     newStartOffset += aSize;
   }
   else if (aStart > aSize) {
     newStartOffset = aSize;
   }
   CheckedInt64 newEndOffset = aEnd;
   if (aEnd < -aSize) {
     newEndOffset = 0;
   }
   else if (aEnd < 0) {
     newEndOffset += aSize;
   }
   else if (aEnd > aSize) {
     newEndOffset = aSize;
   }
   if (!newStartOffset.isValid() || !newEndOffset.isValid() ||
       newStartOffset.value() >= newEndOffset.value()) {
     aStart = aEnd = 0;
   }
   else {
     aStart = newStartOffset.value();
     aEnd = newEndOffset.value();
   }
 }
 NS_IMETHODIMP
 nsDOMFileBase::Slice(int64_t aStart, int64_t aEnd,
                      const nsAString& aContentType, uint8_t optional_argc,
                      nsIDOMBlob **aBlob)
 {
   *aBlob = nullptr;
   // Truncate aStart and aEnd so that we stay within this file.
   uint64_t thisLength;
   nsresult rv = GetSize(&thisLength);
   NS_ENSURE_SUCCESS(rv, rv);
   if (optional_argc < 2) {
     aEnd = (int64_t)thisLength;
   }
   ParseSize((int64_t)thisLength, aStart, aEnd);
   // Create the new file
   *aBlob = CreateSlice((uint64_t)aStart, (uint64_t)(aEnd - aStart),
                        aContentType).take();
   return *aBlob ? NS_OK : NS_ERROR_UNEXPECTED;
 }
 NS_IMETHODIMP
 nsDOMFileBase::GetInternalStream(nsIInputStream **aStream)
 {
   // Must be overridden
   NS_NOTREACHED("Must override GetInternalStream");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 nsDOMFileBase::GetInternalUrl(nsIPrincipal* aPrincipal, nsAString& aURL)
 {
   NS_ENSURE_STATE(aPrincipal);
   nsCString url;
   nsresult rv = nsBlobProtocolHandler::AddDataEntry(
     NS_LITERAL_CSTRING(BLOBURI_SCHEME),
     static_cast<nsIDOMBlob*>(this), aPrincipal, url);
   if (NS_FAILED(rv)) {
     return rv;
   }
   CopyASCIItoUTF16(url, aURL);
   return NS_OK;
 }
 NS_IMETHODIMP_(int64_t)
 nsDOMFileBase::GetFileId()
 {
   int64_t id = -1;
   if (IsStoredFile() && IsWholeFile() && !IsSnapshot()) {
     if (!indexedDB::IndexedDatabaseManager::IsClosed()) {
       indexedDB::IndexedDatabaseManager::FileMutex().Lock();
     }
     NS_ASSERTION(!mFileInfos.IsEmpty(),
                  "A stored file must have at least one file info!");
     nsRefPtr<indexedDB::FileInfo>& fileInfo = mFileInfos.ElementAt(0);
     if (fileInfo) {
       id =  fileInfo->Id();
     }
     if (!indexedDB::IndexedDatabaseManager::IsClosed()) {
       indexedDB::IndexedDatabaseManager::FileMutex().Unlock();
     }
   }
   return id;
 }
 NS_IMETHODIMP_(void)
 nsDOMFileBase::AddFileInfo(indexedDB::FileInfo* aFileInfo)
 {
   if (indexedDB::IndexedDatabaseManager::IsClosed()) {
     NS_ERROR("Shouldn't be called after shutdown!");
     return;
   }
   nsRefPtr<indexedDB::FileInfo> fileInfo = aFileInfo;
   MutexAutoLock lock(indexedDB::IndexedDatabaseManager::FileMutex());
   NS_ASSERTION(!mFileInfos.Contains(aFileInfo),
                "Adding the same file info agan?!");
   nsRefPtr<indexedDB::FileInfo>* element = mFileInfos.AppendElement();
   element->swap(fileInfo);
 }
 NS_IMETHODIMP_(indexedDB::FileInfo*)
 nsDOMFileBase::GetFileInfo(indexedDB::FileManager* aFileManager)
 {
   if (indexedDB::IndexedDatabaseManager::IsClosed()) {
     NS_ERROR("Shouldn't be called after shutdown!");
     return nullptr;
   }
   // A slice created from a stored file must keep the file info alive.
   // However, we don't support sharing of slices yet, so the slice must be
   // copied again. That's why we have to ignore the first file info.
   // Snapshots are handled in a similar way (they have to be copied).
   uint32_t startIndex;
   if (IsStoredFile() && (!IsWholeFile() || IsSnapshot())) {
     startIndex = 1;
   }
   else {
     startIndex = 0;
   }
   MutexAutoLock lock(indexedDB::IndexedDatabaseManager::FileMutex());
   for (uint32_t i = startIndex; i < mFileInfos.Length(); i++) {
     nsRefPtr<indexedDB::FileInfo>& fileInfo = mFileInfos.ElementAt(i);
     if (fileInfo->Manager() == aFileManager) {
       return fileInfo;
     }
   }
   return nullptr;
 }
 NS_IMETHODIMP
 nsDOMFileBase::GetSendInfo(nsIInputStream** aBody,
                            uint64_t* aContentLength,
                            nsACString& aContentType,
                            nsACString& aCharset)
 {
   nsresult rv;
   nsCOMPtr<nsIInputStream> stream;
   rv = this->GetInternalStream(getter_AddRefs(stream));
   NS_ENSURE_SUCCESS(rv, rv);
   rv = this->GetSize(aContentLength);
   NS_ENSURE_SUCCESS(rv, rv);
   nsString contentType;
   rv = this->GetType(contentType);
   NS_ENSURE_SUCCESS(rv, rv);
   CopyUTF16toUTF8(contentType, aContentType);
   aCharset.Truncate();
   stream.forget(aBody);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileBase::GetMutable(bool* aMutable)
 {
   *aMutable = !mImmutable;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileBase::SetMutable(bool aMutable)
 {
   nsresult rv = NS_OK;
   NS_ENSURE_ARG(!mImmutable || !aMutable);
   if (!mImmutable && !aMutable) {
     // Force the content type and size to be cached
     nsString dummyString;
     rv = this->GetType(dummyString);
     NS_ENSURE_SUCCESS(rv, rv);
     uint64_t dummyInt;
     rv = this->GetSize(&dummyInt);
     NS_ENSURE_SUCCESS(rv, rv);
   }
   mImmutable = !aMutable;
   return rv;
 }
 NS_IMETHODIMP_(bool)
 nsDOMFileBase::IsMemoryFile(void)
 {
   return false;
 }
 ////////////////////////////////////////////////////////////////////////////
 // nsDOMFile implementation
 DOMCI_DATA(File, nsDOMFile)
 DOMCI_DATA(Blob, nsDOMFile)
 NS_INTERFACE_MAP_BEGIN(nsDOMFile)
   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMFile)
   NS_INTERFACE_MAP_ENTRY(nsIDOMBlob)
   NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIDOMFile, mIsFile)
   NS_INTERFACE_MAP_ENTRY(nsIXHRSendable)
   NS_INTERFACE_MAP_ENTRY(nsIMutable)
   NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO_CONDITIONAL(File, mIsFile)
   NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO_CONDITIONAL(Blob, !mIsFile)
 NS_INTERFACE_MAP_END
 // Threadsafe when GetMutable() == false
 NS_IMPL_ADDREF(nsDOMFile)
 NS_IMPL_RELEASE(nsDOMFile)
 ////////////////////////////////////////////////////////////////////////////
 // nsDOMFileCC implementation
 NS_IMPL_CYCLE_COLLECTION_CLASS(nsDOMFileCC)
 NS_IMPL_CYCLE_COLLECTION_UNLINK_0(nsDOMFileCC)
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMFileCC)
   // We don't have anything to traverse, but some of our subclasses do.
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMFileCC)
   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMFile)
   NS_INTERFACE_MAP_ENTRY(nsIDOMBlob)
   NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIDOMFile, mIsFile)
   NS_INTERFACE_MAP_ENTRY(nsIXHRSendable)
   NS_INTERFACE_MAP_ENTRY(nsIMutable)
   NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO_CONDITIONAL(File, mIsFile)
   NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO_CONDITIONAL(Blob, !mIsFile)
 NS_INTERFACE_MAP_END
 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMFileCC)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMFileCC)
 ////////////////////////////////////////////////////////////////////////////
 // nsDOMFileFile implementation
 already_AddRefed<nsIDOMBlob>
 nsDOMFileFile::CreateSlice(uint64_t aStart, uint64_t aLength,
                            const nsAString& aContentType)
 {
   nsCOMPtr<nsIDOMBlob> t = new nsDOMFileFile(this, aStart, aLength, aContentType);
   return t.forget();
 }
 NS_IMETHODIMP
 nsDOMFileFile::GetMozFullPathInternal(nsAString &aFilename)
 {
   NS_ASSERTION(mIsFile, "Should only be called on files");
   return mFile->GetPath(aFilename);
 }
 NS_IMETHODIMP
 nsDOMFileFile::GetLastModifiedDate(JSContext* cx, JS::MutableHandle<JS::Value> aLastModifiedDate)
 {
   NS_ASSERTION(mIsFile, "Should only be called on files");
   PRTime msecs;
   if (IsDateUnknown()) {
     nsresult rv = mFile->GetLastModifiedTime(&msecs);
     NS_ENSURE_SUCCESS(rv, rv);
     mLastModificationDate = msecs;
   } else {
     msecs = mLastModificationDate;
   }
   JSObject* date = JS_NewDateObjectMsec(cx, msecs);
   if (date) {
     aLastModifiedDate.setObject(*date);
   }
   else {
     date = JS_NewDateObjectMsec(cx, JS_Now() / PR_USEC_PER_MSEC);
     aLastModifiedDate.setObject(*date);
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileFile::GetSize(uint64_t *aFileSize)
 {
   if (IsSizeUnknown()) {
     NS_ASSERTION(mWholeFile,
                  "Should only use lazy size when using the whole file");
     int64_t fileSize;
     nsresult rv = mFile->GetFileSize(&fileSize);
     NS_ENSURE_SUCCESS(rv, rv);
     if (fileSize < 0) {
       return NS_ERROR_FAILURE;
     }
     mLength = fileSize;
   }
   *aFileSize = mLength;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileFile::GetType(nsAString &aType)
 {
   if (mContentType.IsVoid()) {
     NS_ASSERTION(mWholeFile,
                  "Should only use lazy ContentType when using the whole file");
     nsresult rv;
     nsCOMPtr<nsIMIMEService> mimeService =
       do_GetService(NS_MIMESERVICE_CONTRACTID, &rv);
     NS_ENSURE_SUCCESS(rv, rv);
     nsAutoCString mimeType;
     rv = mimeService->GetTypeFromFile(mFile, mimeType);
     if (NS_FAILED(rv)) {
       mimeType.Truncate();
     }
     AppendUTF8toUTF16(mimeType, mContentType);
     mContentType.SetIsVoid(false);
   }
   aType = mContentType;
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileFile::GetMozLastModifiedDate(uint64_t* aLastModifiedDate)
 {
   NS_ASSERTION(mIsFile, "Should only be called on files");
   if (IsDateUnknown()) {
     PRTime msecs;
     nsresult rv = mFile->GetLastModifiedTime(&msecs);
     NS_ENSURE_SUCCESS(rv, rv);
     mLastModificationDate = msecs;
   }
   *aLastModifiedDate = mLastModificationDate;
   return NS_OK;
 }
 const uint32_t sFileStreamFlags =
   nsIFileInputStream::CLOSE_ON_EOF |
   nsIFileInputStream::REOPEN_ON_REWIND |
   nsIFileInputStream::DEFER_OPEN;
 NS_IMETHODIMP
 nsDOMFileFile::GetInternalStream(nsIInputStream **aStream)
 {
   return mWholeFile ?
     NS_NewLocalFileInputStream(aStream, mFile, -1, -1, sFileStreamFlags) :
     NS_NewPartialLocalFileInputStream(aStream, mFile, mStart, mLength,
                                       -1, -1, sFileStreamFlags);
 }
 void
 nsDOMFileFile::SetPath(const nsAString& aPath)
 {
   MOZ_ASSERT(aPath.IsEmpty() ||
              aPath[aPath.Length() - 1] == char16_t('/'),
              "Path must end with a path separator");
   mPath = aPath;
 }
 ////////////////////////////////////////////////////////////////////////////
 // nsDOMMemoryFile implementation
 already_AddRefed<nsIDOMBlob>
 nsDOMMemoryFile::CreateSlice(uint64_t aStart, uint64_t aLength,
                              const nsAString& aContentType)
 {
   nsCOMPtr<nsIDOMBlob> t =
     new nsDOMMemoryFile(this, aStart, aLength, aContentType);
   return t.forget();
 }
 NS_IMETHODIMP
 nsDOMMemoryFile::GetInternalStream(nsIInputStream **aStream)
 {
   if (mLength > INT32_MAX)
     return NS_ERROR_FAILURE;
   return DataOwnerAdapter::Create(mDataOwner, mStart, mLength, aStream);
 }
 NS_IMETHODIMP_(bool)
 nsDOMMemoryFile::IsMemoryFile(void)
 {
   return true;
 }
 /* static */ StaticMutex
 nsDOMMemoryFile::DataOwner::sDataOwnerMutex;
 /* static */ StaticAutoPtr<LinkedList<nsDOMMemoryFile::DataOwner> >
 nsDOMMemoryFile::DataOwner::sDataOwners;
 /* static */ bool
 nsDOMMemoryFile::DataOwner::sMemoryReporterRegistered;
 MOZ_DEFINE_MALLOC_SIZE_OF(DOMMemoryFileDataOwnerMallocSizeOf)
 class nsDOMMemoryFileDataOwnerMemoryReporter MOZ_FINAL
   : public nsIMemoryReporter
 {
 public:
   NS_DECL_THREADSAFE_ISUPPORTS
   NS_IMETHOD CollectReports(nsIMemoryReporterCallback *aCallback,
                             nsISupports *aClosure)
   {
     typedef nsDOMMemoryFile::DataOwner DataOwner;
     StaticMutexAutoLock lock(DataOwner::sDataOwnerMutex);
     if (!DataOwner::sDataOwners) {
       return NS_OK;
     }
     const size_t LARGE_OBJECT_MIN_SIZE = 8 * 1024;
     size_t smallObjectsTotal = 0;
     for (DataOwner *owner = DataOwner::sDataOwners->getFirst();
          owner; owner = owner->getNext()) {
       size_t size = DOMMemoryFileDataOwnerMallocSizeOf(owner->mData);
       if (size < LARGE_OBJECT_MIN_SIZE) {
         smallObjectsTotal += size;
       }
       else {
         SHA1Sum sha1;
         sha1.update(owner->mData, owner->mLength);
         uint8_t digest[SHA1Sum::HashSize]; // SHA1 digests are 20 bytes long.
         sha1.finish(digest);
         nsAutoCString digestString;
         for (size_t i = 0; i < sizeof(digest); i++) {
           digestString.AppendPrintf("%02x", digest[i]);
         }
         nsresult rv = aCallback->Callback(
           /* process */ NS_LITERAL_CSTRING(""),
           nsPrintfCString(
             "explicit/dom/memory-file-data/large/file(length=%llu, sha1=%s)",
             owner->mLength, digestString.get()),
           KIND_HEAP, UNITS_BYTES, size,
           nsPrintfCString(
             "Memory used to back a memory file of length %llu bytes.  The file "
             "has a sha1 of %s.\n\n"
             "Note that the allocator may round up a memory file's length -- "
             "that is, an N-byte memory file may take up more than N bytes of "
             "memory.",
             owner->mLength, digestString.get()),
           aClosure);
         NS_ENSURE_SUCCESS(rv, rv);
       }
     }
     if (smallObjectsTotal > 0) {
       nsresult rv = aCallback->Callback(
         /* process */ NS_LITERAL_CSTRING(""),
         NS_LITERAL_CSTRING("explicit/dom/memory-file-data/small"),
         KIND_HEAP, UNITS_BYTES, smallObjectsTotal,
         nsPrintfCString(
           "Memory used to back small memory files (less than %d bytes each).\n\n"
           "Note that the allocator may round up a memory file's length -- "
           "that is, an N-byte memory file may take up more than N bytes of "
           "memory."),
         aClosure);
       NS_ENSURE_SUCCESS(rv, rv);
     }
     return NS_OK;
   }
 };
 NS_IMPL_ISUPPORTS(nsDOMMemoryFileDataOwnerMemoryReporter, nsIMemoryReporter)
 /* static */ void
 nsDOMMemoryFile::DataOwner::EnsureMemoryReporterRegistered()
 {
   sDataOwnerMutex.AssertCurrentThreadOwns();
   if (sMemoryReporterRegistered) {
     return;
   }
   RegisterStrongMemoryReporter(new nsDOMMemoryFileDataOwnerMemoryReporter());
   sMemoryReporterRegistered = true;
 }
 ////////////////////////////////////////////////////////////////////////////
 // nsDOMFileList implementation
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(nsDOMFileList)
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMFileList)
   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMFileList)
   NS_INTERFACE_MAP_ENTRY(nsIDOMFileList)
 NS_INTERFACE_MAP_END
 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMFileList)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMFileList)
 JSObject*
 nsDOMFileList::WrapObject(JSContext *cx)
 {
   return FileListBinding::Wrap(cx, this);
 }
 NS_IMETHODIMP
 nsDOMFileList::GetLength(uint32_t* aLength)
 {
   *aLength = Length();
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMFileList::Item(uint32_t aIndex, nsIDOMFile **aFile)
 {
   NS_IF_ADDREF(*aFile = Item(aIndex));
   return NS_OK;
 }
 ////////////////////////////////////////////////////////////////////////////
 // nsDOMFileInternalUrlHolder implementation
 nsDOMFileInternalUrlHolder::nsDOMFileInternalUrlHolder(nsIDOMBlob* aFile,
                                                        nsIPrincipal* aPrincipal
                                                        MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL) {
   MOZ_GUARD_OBJECT_NOTIFIER_INIT;
   aFile->GetInternalUrl(aPrincipal, mUrl);
 }
 nsDOMFileInternalUrlHolder::~nsDOMFileInternalUrlHolder() {
   if (!mUrl.IsEmpty()) {
     nsAutoCString narrowUrl;
     CopyUTF16toUTF8(mUrl, narrowUrl);
     nsBlobProtocolHandler::RemoveDataEntry(narrowUrl);
   }
 }
 ////////////////////////////////////////////////////////////////////////////
 // nsDOMTemporaryFileBlob implementation
 already_AddRefed<nsIDOMBlob>
 nsDOMTemporaryFileBlob::CreateSlice(uint64_t aStart, uint64_t aLength,
                                     const nsAString& aContentType)
 {
   if (aStart + aLength > mLength)
     return nullptr;
   nsCOMPtr<nsIDOMBlob> t =
     new nsDOMTemporaryFileBlob(this, aStart + mStartPos, aLength, aContentType);
   return t.forget();
 }
 NS_IMETHODIMP
 nsDOMTemporaryFileBlob::GetInternalStream(nsIInputStream **aStream)
 {
   nsCOMPtr<nsIInputStream> stream =
     new nsTemporaryFileInputStream(mFileDescOwner, mStartPos, mStartPos + mLength);
   stream.forget(aStream);
   return NS_OK;
 }

The Tor Browser / annotate

content/base/src/nsDOMFile.cpp@deefc01c0e14 (annotated)

content/base/src/nsDOMFile.cpp