gecko-dev/netwerk/cache/nsDiskCacheStreams.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is nsDiskCacheStreams.h, released
* June 13, 2001.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Gordon Sheridan <gordon@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef _nsDiskCacheStreams_h_
#define _nsDiskCacheStreams_h_
#include "nsDiskCacheBinding.h"
#include "nsCache.h"
#include "nsIInputStream.h"
#include "nsIOutputStream.h"
#include "pratom.h"
class nsDiskCacheInputStream;
class nsDiskCacheOutputStream;
class nsDiskCacheDevice;
class nsDiskCacheStreamIO : public nsISupports {
public:
nsDiskCacheStreamIO(nsDiskCacheBinding * binding);
virtual ~nsDiskCacheStreamIO();
NS_DECL_ISUPPORTS
nsresult GetInputStream(PRUint32 offset, nsIInputStream ** inputStream);
nsresult GetOutputStream(PRUint32 offset, nsIOutputStream ** outputStream);
nsresult CloseOutputStream(nsDiskCacheOutputStream * outputStream);
nsresult CloseOutputStreamInternal(nsDiskCacheOutputStream * outputStream);
nsresult Write( const char * buffer,
PRUint32 count,
PRUint32 * bytesWritten);
nsresult Seek(PRInt32 whence, PRInt32 offset);
nsresult Tell(PRUint32 * position);
nsresult SetEOF();
void ClearBinding();
void IncrementInputStreamCount() { PR_ATOMIC_INCREMENT(&mInStreamCount); }
void DecrementInputStreamCount()
{
PR_ATOMIC_DECREMENT(&mInStreamCount);
NS_ASSERTION(mInStreamCount >= 0, "mInStreamCount has gone negative");
}
// GCC 2.95.2 requires this to be defined, although we never call it.
// and OS/2 requires that it not be private
nsDiskCacheStreamIO() { NS_NOTREACHED("oops"); }
private:
void Close();
nsresult OpenCacheFile(PRIntn flags, PRFileDesc ** fd);
nsresult ReadCacheBlocks();
nsresult FlushBufferToFile();
void UpdateFileSize();
void DeleteBuffer();
nsresult Flush();
nsDiskCacheBinding * mBinding; // not an owning reference
nsDiskCacheDevice * mDevice;
nsDiskCacheOutputStream * mOutStream; // not an owning reference
PRInt32 mInStreamCount;
nsCOMPtr<nsILocalFile> mLocalFile;
PRFileDesc * mFD;
PRUint32 mStreamPos; // for Output Streams
PRUint32 mStreamEnd;
PRUint32 mBufPos; // current mark in buffer
PRUint32 mBufEnd; // current end of data in buffer
PRUint32 mBufSize; // current end of buffer
PRBool mBufDirty;
char * mBuffer;
};
#endif // _nsDiskCacheStreams_h_