parser/html/nsHtml5OwningUTF16Buffer.h

   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 #ifndef nsHtml5OwningUTF16Buffer_h
   6 #define nsHtml5OwningUTF16Buffer_h
   7
   8 #include "nsHtml5UTF16Buffer.h"
   9 #include "mozilla/Span.h"
  10
  11 class nsHtml5OwningUTF16Buffer : public nsHtml5UTF16Buffer {
  12  private:
  13   /**
  14    * Passes a buffer and its length to the superclass constructor.
  15    */
  16   explicit nsHtml5OwningUTF16Buffer(char16_t* aBuffer);
  17
  18  public:
  19   /**
  20    * Constructor for a parser key placeholder. (No actual buffer.)
  21    * @param aKey a parser key
  22    */
  23   explicit nsHtml5OwningUTF16Buffer(void* aKey);
  24
  25  protected:
  26   /**
  27    * Takes care of releasing the owned buffer.
  28    */
  29   ~nsHtml5OwningUTF16Buffer();
  30
  31  public:
  32   /**
  33    * The next buffer in a queue.
  34    */
  35   RefPtr<nsHtml5OwningUTF16Buffer> next;
  36
  37   /**
  38    * A parser key.
  39    */
  40   void* key;
  41
  42   static already_AddRefed<nsHtml5OwningUTF16Buffer> FalliblyCreate(
  43       int32_t aLength);
  44
  45   /**
  46    * Swap start, end and buffer fields with another object.
  47    */
  48   void Swap(nsHtml5OwningUTF16Buffer* aOther);
  49
  50   /**
  51    * Return a span from `end` to `aBufferSize`.
  52    */
  53   mozilla::Span<char16_t> TailAsSpan(int32_t aBufferSize);
  54
  55   /**
  56    * Add the argument to `end`.
  57    */
  58   void AdvanceEnd(int32_t aNumberOfCodeUnits);
  59
  60   nsrefcnt AddRef();
  61   nsrefcnt Release();
  62
  63  private:
  64   mozilla::ThreadSafeAutoRefCnt mRefCnt;
  65 };
  66
  67 #endif  // nsHtml5OwningUTF16Buffer_h