parser/html/nsHtml5Atom.cpp
author Nicholas Nethercote <nnethercote@mozilla.com>
Tue, 05 Sep 2017 16:06:43 +1000
changeset 379424 60ac0fadec3127895fa37fe392f4981f4fa75105
parent 373993 54888c1fde2a972988213708412d6cc2b90f551b
permissions -rw-r--r--
Bug 1396694 (part 1) - Make nsIAtom non-scriptable. r=froydnj. This also lets us remove a couple of IDL methods.

/* 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 "nsHtml5Atom.h"
#include "nsAutoPtr.h"
#include "mozilla/Unused.h"

nsHtml5Atom::nsHtml5Atom(const nsAString& aString)
{
  mLength = aString.Length();
  SetKind(AtomKind::HTML5Atom);
  RefPtr<nsStringBuffer> buf = nsStringBuffer::FromString(aString);
  if (buf) {
    mString = static_cast<char16_t*>(buf->Data());
  } else {
    const size_t size = (mLength + 1) * sizeof(char16_t);
    buf = nsStringBuffer::Alloc(size);
    if (MOZ_UNLIKELY(!buf)) {
      // We OOM because atom allocations should be small and it's hard to
      // handle them more gracefully in a constructor.
      NS_ABORT_OOM(size);
    }
    mString = static_cast<char16_t*>(buf->Data());
    CopyUnicodeTo(aString, 0, mString, mLength);
    mString[mLength] = char16_t(0);
  }

  NS_ASSERTION(mString[mLength] == char16_t(0), "null terminated");
  NS_ASSERTION(buf && buf->StorageSize() >= (mLength+1) * sizeof(char16_t),
               "enough storage");
  NS_ASSERTION(Equals(aString), "correct data");

  // Take ownership of buffer
  mozilla::Unused << buf.forget();
}

nsHtml5Atom::~nsHtml5Atom()
{
  nsStringBuffer::FromData(mString)->Release();
}

NS_IMETHODIMP
nsHtml5Atom::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
  NS_NOTREACHED("Attempt to call QueryInterface an nsHtml5Atom.");
  return NS_ERROR_UNEXPECTED;
}

NS_IMETHODIMP
nsHtml5Atom::ToUTF8String(nsACString& aReturn)
{
  NS_NOTREACHED("Should not attempt to convert to an UTF-8 string.");
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP_(size_t)
nsHtml5Atom::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
{
  NS_NOTREACHED("Should not call SizeOfIncludingThis.");
  return 0;
}