зеркало из https://github.com/mozilla/gecko-dev.git
86 строки
2.8 KiB
C++
86 строки
2.8 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 SlicedInputStream_h
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#define SlicedInputStream_h
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#include "mozilla/Attributes.h"
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#include "nsCOMPtr.h"
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#include "nsIAsyncInputStream.h"
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#include "nsICloneableInputStream.h"
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#include "nsIIPCSerializableInputStream.h"
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#include "nsISeekableStream.h"
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namespace mozilla {
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// A wrapper for a slice of an underlying input stream.
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class SlicedInputStream final : public nsIAsyncInputStream
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, public nsICloneableInputStream
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, public nsIIPCSerializableInputStream
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, public nsISeekableStream
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, public nsIInputStreamCallback
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{
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSIASYNCINPUTSTREAM
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NS_DECL_NSICLONEABLEINPUTSTREAM
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NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
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NS_DECL_NSISEEKABLESTREAM
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NS_DECL_NSIINPUTSTREAMCALLBACK
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// Create an input stream whose data comes from a slice of aInputStream. The
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// slice begins at aStart bytes beyond aInputStream's current position, and
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// extends for a maximum of aLength bytes. If aInputStream contains fewer
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// than aStart bytes, reading from SlicedInputStream returns no data. If
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// aInputStream contains more than aStart bytes, but fewer than aStart +
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// aLength bytes, reading from SlicedInputStream returns as many bytes as can
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// be consumed from aInputStream after reading aLength bytes.
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//
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// aInputStream should not be read from after constructing a
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// SlicedInputStream wrapper around it.
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SlicedInputStream(already_AddRefed<nsIInputStream> aInputStream,
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uint64_t aStart, uint64_t aLength);
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// This CTOR is meant to be used just for IPC.
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SlicedInputStream();
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private:
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~SlicedInputStream();
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void
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SetSourceStream(already_AddRefed<nsIInputStream> aInputStream);
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nsresult
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RunAsyncWaitCallback();
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nsCOMPtr<nsIInputStream> mInputStream;
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// Raw pointers because these are just QI of mInputStream.
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nsICloneableInputStream* mWeakCloneableInputStream;
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nsIIPCSerializableInputStream* mWeakIPCSerializableInputStream;
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nsISeekableStream* mWeakSeekableInputStream;
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nsIAsyncInputStream* mWeakAsyncInputStream;
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uint64_t mStart;
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uint64_t mLength;
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uint64_t mCurPos;
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bool mClosed;
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// These four are used for AsyncWait.
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nsCOMPtr<nsIInputStreamCallback> mAsyncWaitCallback;
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nsCOMPtr<nsIEventTarget> mAsyncWaitEventTarget;
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uint32_t mAsyncWaitFlags;
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uint32_t mAsyncWaitRequestedCount;
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};
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} // mozilla namespace
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#endif // SlicedInputStream_h
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