gecko-dev/netwerk/base/PartiallySeekableInputStream.h

69 lines
2.2 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 PartiallySeekableInputStream_h
#define PartiallySeekableInputStream_h
#include "mozilla/Attributes.h"
#include "nsCOMPtr.h"
#include "nsIAsyncInputStream.h"
#include "nsICloneableInputStream.h"
#include "nsIIPCSerializableInputStream.h"
#include "nsISeekableStream.h"
namespace mozilla {
namespace net {
// A wrapper for making a stream seekable for the first |aBufferSize| bytes.
// Note that this object takes the ownership of the underlying stream.
class PartiallySeekableInputStream final : public nsISeekableStream
, public nsIAsyncInputStream
, public nsICloneableInputStream
, public nsIIPCSerializableInputStream
, public nsIInputStreamCallback
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIINPUTSTREAM
NS_DECL_NSISEEKABLESTREAM
NS_DECL_NSIASYNCINPUTSTREAM
NS_DECL_NSICLONEABLEINPUTSTREAM
NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
NS_DECL_NSIINPUTSTREAMCALLBACK
explicit PartiallySeekableInputStream(already_AddRefed<nsIInputStream> aInputStream,
uint64_t aBufferSize = 4096);
private:
PartiallySeekableInputStream(already_AddRefed<nsIInputStream> aClonedBaseStream,
PartiallySeekableInputStream* aClonedFrom);
~PartiallySeekableInputStream() = default;
void
Init();
nsCOMPtr<nsIInputStream> mInputStream;
// Raw pointers because these are just QI of mInputStream.
nsICloneableInputStream* mWeakCloneableInputStream;
nsIIPCSerializableInputStream* mWeakIPCSerializableInputStream;
nsIAsyncInputStream* mWeakAsyncInputStream;
nsCOMPtr<nsIInputStreamCallback> mAsyncWaitCallback;
nsTArray<char> mCachedBuffer;
uint64_t mBufferSize;
uint64_t mPos;
bool mClosed;
};
} // net namespace
} // mozilla namespace
#endif // PartiallySeekableInputStream_h