import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

netwerk/base/SimpleBuffer.h

@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 SimpleBuffer_h__
+#define SimpleBuffer_h__
+
+/*
+  This class is similar to a nsPipe except it does not have any locking, stores
+  an unbounded amount of data, can only be used on one thread, and has much
+  simpler result code semantics to deal with.
+*/
+
+#include "prtypes.h"
+#include "mozilla/LinkedList.h"
+#include "nsIThreadInternal.h"
+
+namespace mozilla {
+namespace net {
+
+class SimpleBufferPage : public LinkedListElement<SimpleBufferPage>
+{
+public:
+  SimpleBufferPage() : mReadOffset(0), mWriteOffset(0) {}
+  static const size_t kSimpleBufferPageSize = 32000;
+
+private:
+  friend class SimpleBuffer;
+  char mBuffer[kSimpleBufferPageSize];
+  size_t mReadOffset;
+  size_t mWriteOffset;
+};
+
+class SimpleBuffer
+{
+public:
+  SimpleBuffer();
+  ~SimpleBuffer() {}
+
+  nsresult Write(char *stc, size_t len); // return OK or OUT_OF_MEMORY
+  size_t Read(char *dest, size_t maxLen); // return bytes read
+  size_t Available();
+  void Clear();
+
+private:
+  PRThread *mOwningThread;
+  nsresult mStatus;
+  AutoCleanLinkedList<SimpleBufferPage> mBufferList;
+  size_t mAvailable;
+};
+
+} // namespace net
+} // namespace mozilla
+
+#endif