gecko/netwerk/cache/nsDiskCache.h

76 lines
2.8 KiB
C++

/* -*- 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 nsCacheDevice.h, released
* March 9, 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):
* Patrick Beard <beard@netscape.com>
* 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 _nsDiskCache_h_
#define _nsDiskCache_h_
#include "nsCacheEntry.h"
#ifdef XP_WIN
#include <winsock.h> // for htonl/ntohl
#endif
class nsDiskCache {
public:
enum {
kCurrentVersion = 0x0001000D // format = 16 bits major version/16 bits minor version
};
enum { kData, kMetaData };
// Parameter initval initializes internal state of hash function. Hash values are different
// for the same text when different initval is used. It can be any random number.
//
// It can be used for generating 64-bit hash value:
// (PRUint64(Hash(key, initval1)) << 32) | Hash(key, initval2)
//
// It can be also used to hash multiple strings:
// h = Hash(string1, 0);
// h = Hash(string2, h);
// ...
static PLDHashNumber Hash(const char* key, PLDHashNumber initval=0);
static nsresult Truncate(PRFileDesc * fd, PRUint32 newEOF);
};
#endif // _nsDiskCache_h_