forked from mirrors/gecko-dev
54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_quota_MemoryOutputStream_h
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#define mozilla_dom_quota_MemoryOutputStream_h
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#include <cstdint>
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#include "mozilla/AlreadyAddRefed.h"
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#include "nsIOutputStream.h"
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#include "nsISupports.h"
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#include "nsString.h"
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class nsIInputStream;
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namespace mozilla {
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namespace dom {
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namespace quota {
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// An output stream so you can read your potentially-async input stream into
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// a contiguous buffer in the form of an nsCString using NS_AsyncCopy.
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// Back when streams were more synchronous and people didn't know blocking I/O
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// was bad, if you wanted to read a stream into a flat buffer, you could use
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// NS_ReadInputStreamToString/NS_ReadInputStreamToBuffer. But those don't work
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// with async streams. This can be used to replace hand-rolled Read/AsyncWait()
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// loops. Because you specify the expected size up front, the nsCString buffer
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// is pre-allocated so wasteful reallocations can be avoided. However,
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// nsCString currently may over-allocate and this can be problematic on 32-bit
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// windows until we're rid of that build configuration.
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class MemoryOutputStream final : public nsIOutputStream {
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nsCString mData;
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uint64_t mOffset;
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public:
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static already_AddRefed<MemoryOutputStream> Create(uint64_t aSize);
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const nsCString& Data() const { return mData; }
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private:
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MemoryOutputStream() : mOffset(0) {}
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virtual ~MemoryOutputStream() = default;
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIOUTPUTSTREAM
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};
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} // namespace quota
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} // namespace dom
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} // namespace mozilla
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#endif /* mozilla_dom_quota_MemoryOutputStream_h */
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