зеркало из https://github.com/mozilla/gecko-dev.git
50 строки
1.7 KiB
C++
50 строки
1.7 KiB
C++
/* -*- 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_dom_quota_MemoryOutputStream_h
|
|
#define mozilla_dom_quota_MemoryOutputStream_h
|
|
|
|
#include "nsIOutputStream.h"
|
|
#include "nsString.h"
|
|
|
|
namespace mozilla {
|
|
namespace dom {
|
|
namespace quota {
|
|
|
|
// An output stream so you can read your potentially-async input stream into
|
|
// a contiguous buffer in the form of an nsCString using NS_AsyncCopy.
|
|
// Back when streams were more synchronous and people didn't know blocking I/O
|
|
// was bad, if you wanted to read a stream into a flat buffer, you could use
|
|
// NS_ReadInputStreamToString/NS_ReadInputStreamToBuffer. But those don't work
|
|
// with async streams. This can be used to replace hand-rolled Read/AsyncWait()
|
|
// loops. Because you specify the expected size up front, the nsCString buffer
|
|
// is pre-allocated so wasteful reallocations can be avoided. However,
|
|
// nsCString currently may over-allocate and this can be problematic on 32-bit
|
|
// windows until we're rid of that build configuration.
|
|
class MemoryOutputStream final : public nsIOutputStream {
|
|
nsCString mData;
|
|
uint64_t mOffset;
|
|
|
|
public:
|
|
static already_AddRefed<MemoryOutputStream> Create(uint64_t aSize);
|
|
|
|
const nsCString& Data() const { return mData; }
|
|
|
|
private:
|
|
MemoryOutputStream() : mOffset(0) {}
|
|
|
|
virtual ~MemoryOutputStream() = default;
|
|
|
|
NS_DECL_THREADSAFE_ISUPPORTS
|
|
NS_DECL_NSIOUTPUTSTREAM
|
|
};
|
|
|
|
} // namespace quota
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif /* mozilla_dom_quota_MemoryOutputStream_h */
|