зеркало из https://github.com/mozilla/gecko-dev.git
51 строка
1.7 KiB
C
51 строка
1.7 KiB
C
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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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// 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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{
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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_NSICLONEABLEINPUTSTREAM
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NS_DECL_NSIASYNCINPUTSTREAM
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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(nsIInputStream* aInputStream,
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uint64_t aStart, uint64_t aLength);
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private:
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~SlicedInputStream();
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nsCOMPtr<nsIInputStream> mInputStream;
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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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};
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#endif // SlicedInputStream_h
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