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121 lines
4.4 KiB
C++
121 lines
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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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 nsDiskCacheStreams.h, released
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* June 13, 2001.
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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) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Gordon Sheridan <gordon@netscape.com>
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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 _nsDiskCacheStreams_h_
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#define _nsDiskCacheStreams_h_
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#include "nsDiskCacheBinding.h"
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#include "nsCache.h"
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#include "nsIInputStream.h"
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#include "nsIOutputStream.h"
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#include "pratom.h"
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class nsDiskCacheInputStream;
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class nsDiskCacheOutputStream;
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class nsDiskCacheDevice;
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class nsDiskCacheStreamIO : public nsISupports {
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public:
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nsDiskCacheStreamIO(nsDiskCacheBinding * binding);
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virtual ~nsDiskCacheStreamIO();
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NS_DECL_ISUPPORTS
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nsresult GetInputStream(PRUint32 offset, nsIInputStream ** inputStream);
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nsresult GetOutputStream(PRUint32 offset, nsIOutputStream ** outputStream);
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nsresult CloseOutputStream(nsDiskCacheOutputStream * outputStream);
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nsresult CloseOutputStreamInternal(nsDiskCacheOutputStream * outputStream);
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nsresult Write( const char * buffer,
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PRUint32 count,
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PRUint32 * bytesWritten);
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nsresult Seek(PRInt32 whence, PRInt32 offset);
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nsresult Tell(PRUint32 * position);
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nsresult SetEOF();
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void ClearBinding();
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void IncrementInputStreamCount() { PR_ATOMIC_INCREMENT(&mInStreamCount); }
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void DecrementInputStreamCount()
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{
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PR_ATOMIC_DECREMENT(&mInStreamCount);
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NS_ASSERTION(mInStreamCount >= 0, "mInStreamCount has gone negative");
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}
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// GCC 2.95.2 requires this to be defined, although we never call it.
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// and OS/2 requires that it not be private
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nsDiskCacheStreamIO() { NS_NOTREACHED("oops"); }
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private:
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void Close();
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nsresult OpenCacheFile(PRIntn flags, PRFileDesc ** fd);
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nsresult ReadCacheBlocks();
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nsresult FlushBufferToFile();
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void UpdateFileSize();
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void DeleteBuffer();
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nsresult Flush();
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nsDiskCacheBinding * mBinding; // not an owning reference
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nsDiskCacheDevice * mDevice;
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nsDiskCacheOutputStream * mOutStream; // not an owning reference
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PRInt32 mInStreamCount;
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nsCOMPtr<nsILocalFile> mLocalFile;
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PRFileDesc * mFD;
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PRUint32 mStreamPos; // for Output Streams
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PRUint32 mStreamEnd;
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PRUint32 mBufPos; // current mark in buffer
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PRUint32 mBufEnd; // current end of data in buffer
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PRUint32 mBufSize; // current end of buffer
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PRBool mBufDirty;
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char * mBuffer;
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};
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#endif // _nsDiskCacheStreams_h_
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