1 files changed, 64 insertions, 0 deletions
diff --git a/parser/html/nsHtml5OwningUTF16Buffer.h b/parser/html/nsHtml5OwningUTF16Buffer.h
new file mode 100644
index 0000000000..2cc94583e7
--- /dev/null
+++ b/parser/html/nsHtml5OwningUTF16Buffer.h
@@ -0,0 +1,64 @@
+/* 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/. */
+
+#ifndef nsHtml5OwningUTF16Buffer_h
+#define nsHtml5OwningUTF16Buffer_h
+
+#include "nsHtml5UTF16Buffer.h"
+#include "mozilla/Span.h"
+
+class nsHtml5OwningUTF16Buffer : public nsHtml5UTF16Buffer {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(nsHtml5OwningUTF16Buffer)
+
+ private:
+  /**
+   * Passes a buffer and its length to the superclass constructor.
+   */
+  explicit nsHtml5OwningUTF16Buffer(char16_t* aBuffer);
+
+ public:
+  /**
+   * Constructor for a parser key placeholder. (No actual buffer.)
+   * @param aKey a parser key
+   */
+  explicit nsHtml5OwningUTF16Buffer(void* aKey);
+
+ protected:
+  /**
+   * Takes care of releasing the owned buffer.
+   */
+  ~nsHtml5OwningUTF16Buffer();
+
+ public:
+  /**
+   * The next buffer in a queue.
+   */
+  RefPtr<nsHtml5OwningUTF16Buffer> next;
+
+  /**
+   * A parser key.
+   */
+  void* key;
+
+  static already_AddRefed<nsHtml5OwningUTF16Buffer> FalliblyCreate(
+      int32_t aLength);
+
+  /**
+   * Swap start, end and buffer fields with another object.
+   */
+  void Swap(nsHtml5OwningUTF16Buffer* aOther);
+
+  /**
+   * Return a span from `end` to `aBufferSize`.
+   */
+  mozilla::Span<char16_t> TailAsSpan(int32_t aBufferSize);
+
+  /**
+   * Add the argument to `end`.
+   */
+  void AdvanceEnd(int32_t aNumberOfCodeUnits);
+};
+
+#endif  // nsHtml5OwningUTF16Buffer_h