1 files changed, 61 insertions, 0 deletions
diff --git a/xpcom/io/StreamBufferSource.h b/xpcom/io/StreamBufferSource.h
new file mode 100644
index 0000000000..f0a3d30eea
--- /dev/null
+++ b/xpcom/io/StreamBufferSource.h
@@ -0,0 +1,61 @@
+/* -*- 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/. */
+
+#ifndef mozilla_StreamBufferSource_h
+#define mozilla_StreamBufferSource_h
+
+#include <cstddef>
+#include "ErrorList.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/Span.h"
+#include "nsISupportsImpl.h"
+#include "nsString.h"
+
+namespace mozilla {
+
+class StreamBufferSource {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(StreamBufferSource)
+
+  virtual Span<const char> Data() = 0;
+
+  virtual nsresult GetData(nsACString& aString) {
+    Span<const char> data = Data();
+    if (!aString.Assign(data.Elements(), data.Length(), fallible)) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+    return NS_OK;
+  }
+
+  virtual bool Owning() = 0;
+
+  virtual size_t SizeOfExcludingThisIfUnshared(MallocSizeOf aMallocSizeOf) {
+    return SizeOfExcludingThisEvenIfShared(aMallocSizeOf);
+  }
+  size_t SizeOfIncludingThisIfUnshared(MallocSizeOf aMallocSizeOf) {
+    if (mRefCnt > 1) {
+      return 0;
+    }
+    size_t n = aMallocSizeOf(this);
+    n += SizeOfExcludingThisIfUnshared(aMallocSizeOf);
+    return n;
+  }
+
+  virtual size_t SizeOfExcludingThisEvenIfShared(
+      MallocSizeOf aMallocSizeOf) = 0;
+  size_t SizeOfIncludingThisEvenIfShared(MallocSizeOf aMallocSizeOf) {
+    size_t n = aMallocSizeOf(this);
+    n += SizeOfExcludingThisEvenIfShared(aMallocSizeOf);
+    return n;
+  }
+
+ protected:
+  virtual ~StreamBufferSource() = default;
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_StreamBufferSource_h