pjs/netwerk/cache/nsDiskCacheEntry.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 nsMemoryCacheDevice.cpp, released
* February 22, 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>
* Patrick C. Beard <beard@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 _nsDiskCacheEntry_h_
#define _nsDiskCacheEntry_h_
#include "nsDiskCacheMap.h"
#include "nsCacheEntry.h"
/******************************************************************************
* nsDiskCacheEntry
*****************************************************************************/
struct nsDiskCacheEntry {
PRUint32 mHeaderVersion; // useful for stand-alone metadata files
PRUint32 mMetaLocation; // for verification
PRInt32 mFetchCount;
PRUint32 mLastFetched;
PRUint32 mLastModified;
PRUint32 mExpirationTime;
PRUint32 mDataSize;
PRUint32 mKeySize; // includes terminating null byte
PRUint32 mMetaDataSize; // includes terminating null byte
// followed by key data (mKeySize bytes)
// followed by meta data (mMetaDataSize bytes)
PRUint32 Size() { return sizeof(nsDiskCacheEntry) +
mKeySize + mMetaDataSize;
}
char* Key() { return reinterpret_cast<char*const>(this) +
sizeof(nsDiskCacheEntry);
}
char* MetaData()
{ return Key() + mKeySize; }
nsCacheEntry * CreateCacheEntry(nsCacheDevice * device);
void Swap() // host to network (memory to disk)
{
#if defined(IS_LITTLE_ENDIAN)
mHeaderVersion = htonl(mHeaderVersion);
mMetaLocation = htonl(mMetaLocation);
mFetchCount = htonl(mFetchCount);
mLastFetched = htonl(mLastFetched);
mLastModified = htonl(mLastModified);
mExpirationTime = htonl(mExpirationTime);
mDataSize = htonl(mDataSize);
mKeySize = htonl(mKeySize);
mMetaDataSize = htonl(mMetaDataSize);
#endif
}
void Unswap() // network to host (disk to memory)
{
#if defined(IS_LITTLE_ENDIAN)
mHeaderVersion = ntohl(mHeaderVersion);
mMetaLocation = ntohl(mMetaLocation);
mFetchCount = ntohl(mFetchCount);
mLastFetched = ntohl(mLastFetched);
mLastModified = ntohl(mLastModified);
mExpirationTime = ntohl(mExpirationTime);
mDataSize = ntohl(mDataSize);
mKeySize = ntohl(mKeySize);
mMetaDataSize = ntohl(mMetaDataSize);
#endif
}
};
/******************************************************************************
* nsDiskCacheEntryInfo
*****************************************************************************/
class nsDiskCacheEntryInfo : public nsICacheEntryInfo {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSICACHEENTRYINFO
nsDiskCacheEntryInfo(const char * deviceID, nsDiskCacheEntry * diskEntry)
: mDeviceID(deviceID)
, mDiskEntry(diskEntry)
{
}
virtual ~nsDiskCacheEntryInfo() {}
const char* Key() { return mDiskEntry->Key(); }
private:
const char * mDeviceID;
nsDiskCacheEntry * mDiskEntry;
};
#endif /* _nsDiskCacheEntry_h_ */