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152 lines
5.1 KiB
C++
152 lines
5.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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 "nsInt64.h"
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#include "nsIIPCSerializable.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_ISUPPORTS
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NS_DECL_NSISEEKABLESTREAM
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nsBufferedStream();
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virtual ~nsBufferedStream();
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nsresult Close();
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protected:
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nsresult Init(nsISupports* stream, PRUint32 bufferSize);
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NS_IMETHOD Fill() = 0;
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NS_IMETHOD Flush() = 0;
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PRUint32 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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nsInt64 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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PRUint32 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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PRUint32 mFillPoint;
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nsISupports* mStream; // cast to appropriate subclass
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PRPackedBool mBufferDisabled;
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PRUint8 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 nsIIPCSerializable
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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_NSIIPCSERIALIZABLE
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nsBufferedInputStream() : nsBufferedStream() {}
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virtual ~nsBufferedInputStream() {}
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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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NS_IMETHOD Fill();
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NS_IMETHOD Flush() { return NS_OK; } // no-op for input streams
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};
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////////////////////////////////////////////////////////////////////////////////
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class nsBufferedOutputStream : 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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virtual ~nsBufferedOutputStream() { nsBufferedOutputStream::Close(); }
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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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NS_IMETHOD Fill() { return NS_OK; } // no-op for input 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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