gecko-dev/netwerk/cache/nsDiskCacheStreams.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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();
nsresult 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<nsIFile> 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
bool mBufDirty;
char * mBuffer;
};
#endif // _nsDiskCacheStreams_h_