123 lines
3.8 KiB
C++
123 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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 nsBufferedStreams_h__
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#define nsBufferedStreams_h__
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#include "nsIBufferedStreams.h"
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#include "nsIInputStream.h"
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#include "nsIOutputStream.h"
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#include "nsISafeOutputStream.h"
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#include "nsISeekableStream.h"
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#include "nsIStreamBufferAccess.h"
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#include "nsCOMPtr.h"
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#include "nsIIPCSerializableInputStream.h"
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////////////////////////////////////////////////////////////////////////////////
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class nsBufferedStream : public nsISeekableStream
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{
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSISEEKABLESTREAM
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nsBufferedStream();
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nsresult Close();
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protected:
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virtual ~nsBufferedStream();
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nsresult Init(nsISupports* stream, uint32_t bufferSize);
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NS_IMETHOD Fill() = 0;
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NS_IMETHOD Flush() = 0;
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uint32_t mBufferSize;
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char* mBuffer;
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// mBufferStartOffset is the offset relative to the start of mStream.
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int64_t mBufferStartOffset;
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// mCursor is the read cursor for input streams, or write cursor for
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// output streams, and is relative to mBufferStartOffset.
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uint32_t mCursor;
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// mFillPoint is the amount available in the buffer for input streams,
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// or the high watermark of bytes written into the buffer, and therefore
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// is relative to mBufferStartOffset.
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uint32_t mFillPoint;
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nsISupports* mStream; // cast to appropriate subclass
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bool mBufferDisabled;
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bool mEOF; // True if mStream is at EOF
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uint8_t mGetBufferCount;
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};
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////////////////////////////////////////////////////////////////////////////////
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class nsBufferedInputStream : public nsBufferedStream,
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public nsIBufferedInputStream,
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public nsIStreamBufferAccess,
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public nsIIPCSerializableInputStream
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{
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public:
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSIBUFFEREDINPUTSTREAM
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NS_DECL_NSISTREAMBUFFERACCESS
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NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
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nsBufferedInputStream() : nsBufferedStream() {}
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static nsresult
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Create(nsISupports *aOuter, REFNSIID aIID, void **aResult);
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nsIInputStream* Source() {
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return (nsIInputStream*)mStream;
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}
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protected:
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virtual ~nsBufferedInputStream() {}
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NS_IMETHOD Fill() override;
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NS_IMETHOD Flush() override { return NS_OK; } // no-op for input streams
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};
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////////////////////////////////////////////////////////////////////////////////
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class nsBufferedOutputStream final : public nsBufferedStream,
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public nsISafeOutputStream,
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public nsIBufferedOutputStream,
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public nsIStreamBufferAccess
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{
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public:
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_NSIOUTPUTSTREAM
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NS_DECL_NSISAFEOUTPUTSTREAM
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NS_DECL_NSIBUFFEREDOUTPUTSTREAM
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NS_DECL_NSISTREAMBUFFERACCESS
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nsBufferedOutputStream() : nsBufferedStream() {}
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static nsresult
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Create(nsISupports *aOuter, REFNSIID aIID, void **aResult);
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nsIOutputStream* Sink() {
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return (nsIOutputStream*)mStream;
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}
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protected:
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virtual ~nsBufferedOutputStream() { nsBufferedOutputStream::Close(); }
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NS_IMETHOD Fill() override { return NS_OK; } // no-op for output streams
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nsCOMPtr<nsISafeOutputStream> mSafeStream; // QI'd from mStream
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};
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////////////////////////////////////////////////////////////////////////////////
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#endif // nsBufferedStreams_h__
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