parser/html/nsHtml5OwningUTF16Buffer.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "nsHtml5OwningUTF16Buffer.h"
   6
   7 #include "mozilla/Span.h"
   8
   9 using namespace mozilla;
  10
  11 nsHtml5OwningUTF16Buffer::nsHtml5OwningUTF16Buffer(char16_t* aBuffer)
  12     : nsHtml5UTF16Buffer(aBuffer, 0), next(nullptr), key(nullptr) {}
  13
  14 nsHtml5OwningUTF16Buffer::nsHtml5OwningUTF16Buffer(void* aKey)
  15     : nsHtml5UTF16Buffer(nullptr, 0), next(nullptr), key(aKey) {}
  16
  17 nsHtml5OwningUTF16Buffer::~nsHtml5OwningUTF16Buffer() {
  18   DeleteBuffer();
  19
  20   // This is to avoid dtor recursion on 'next', bug 706932.
  21   RefPtr<nsHtml5OwningUTF16Buffer> tail;
  22   tail.swap(next);
  23   while (tail && tail->mRefCnt == 1) {
  24     RefPtr<nsHtml5OwningUTF16Buffer> tmp;
  25     tmp.swap(tail->next);
  26     tail.swap(tmp);
  27   }
  28 }
  29
  30 // static
  31 already_AddRefed<nsHtml5OwningUTF16Buffer>
  32 nsHtml5OwningUTF16Buffer::FalliblyCreate(int32_t aLength) {
  33   char16_t* newBuf = new (mozilla::fallible) char16_t[aLength];
  34   if (!newBuf) {
  35     return nullptr;
  36   }
  37   RefPtr<nsHtml5OwningUTF16Buffer> newObj =
  38       new (mozilla::fallible) nsHtml5OwningUTF16Buffer(newBuf);
  39   if (!newObj) {
  40     delete[] newBuf;
  41     return nullptr;
  42   }
  43   return newObj.forget();
  44 }
  45
  46 void nsHtml5OwningUTF16Buffer::Swap(nsHtml5OwningUTF16Buffer* aOther) {
  47   nsHtml5UTF16Buffer::Swap(aOther);
  48 }
  49
  50 Span<char16_t> nsHtml5OwningUTF16Buffer::TailAsSpan(int32_t aBufferSize) {
  51   MOZ_ASSERT(aBufferSize >= getEnd());
  52   return {getBuffer() + getEnd(), static_cast<size_t>(aBufferSize - getEnd())};
  53 }
  54
  55 void nsHtml5OwningUTF16Buffer::AdvanceEnd(int32_t aNumberOfCodeUnits) {
  56   setEnd(getEnd() + aNumberOfCodeUnits);
  57 }