netwerk/base/SimpleBuffer.h
author Andrew Halberstadt <ahalberstadt@mozilla.com>
Thu, 25 May 2017 11:48:03 -0400
changeset 410946 ff64a7889c1fac56d48205fc2fad4eb5aa481a73
parent 404244 6fddc78b430a8da96dba18d24827215b85e7b00c
child 469949 17e1f96d453f869f9bb64cc1d889320ca2b4adba
permissions -rw-r--r--
Bug 1346025 - Move vendored python modules from /python to /third_party/python, r=ted This commit is a simple 'hg mv' and does not contain any file modifications. *** Bug 1346025 - Split vendored modules in python/moz.build to third_party/python/moz.build, r=ted *** Bug 1346025 - Update references to moved python modules, r=ted MozReview-Commit-ID: A12RnIFtXju

/* -*- 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:
  NS_DECL_OWNINGTHREAD

  nsresult mStatus;
  AutoCleanLinkedList<SimpleBufferPage> mBufferList;
  size_t mAvailable;
};

} // namespace net
} // namespace mozilla

#endif