xpcom/string/nsTDependentString.cpp
author Chris Pearce <cpearce@mozilla.com>
Mon, 12 Mar 2018 13:05:04 +1300
changeset 407747 09d7852a968dbc0d25ba6e299b78f53ee5ba8ca9
parent 379572 b4c1ad9565ee9d00d96501c4a83083daf25c1413
child 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1434804 - Pause autoplayed media if they become audible. r=kamidphish Our autoplay blocking is trivial to defeat; just mute or volume=0 a video, play(), and then unmute, and then you're playing audibly. So this patch makes us pause() media that become audible atfter playback has started. MozReview-Commit-ID: 2RAtbohMGJO

/* -*- 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/. */

template <typename T>
nsTDependentString<T>::nsTDependentString(const char_type* aStart,
                                          const char_type* aEnd)
  : string_type(const_cast<char_type*>(aStart), uint32_t(aEnd - aStart),
                DataFlags::TERMINATED, ClassFlags(0))
{
  MOZ_RELEASE_ASSERT(aStart <= aEnd, "Overflow!");
  this->AssertValidDependentString();
}

template <typename T>
void
nsTDependentString<T>::Rebind(const string_type& str, uint32_t startPos)
{
  MOZ_ASSERT(str.GetDataFlags() & DataFlags::TERMINATED, "Unterminated flat string");

  // If we currently own a buffer, release it.
  this->Finalize();

  size_type strLength = str.Length();

  if (startPos > strLength) {
    startPos = strLength;
  }

  char_type* newData =
    const_cast<char_type*>(static_cast<const char_type*>(str.Data())) + startPos;
  size_type newLen = strLength - startPos;
  DataFlags newDataFlags = str.GetDataFlags() & (DataFlags::TERMINATED | DataFlags::LITERAL);
  this->SetData(newData, newLen, newDataFlags);
}

template <typename T>
void
nsTDependentString<T>::Rebind(const char_type* aStart, const char_type* aEnd)
{
  MOZ_RELEASE_ASSERT(aStart <= aEnd, "Overflow!");
  this->Rebind(aStart, uint32_t(aEnd - aStart));
}