101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _nsDiskCacheEntry_h_
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#define _nsDiskCacheEntry_h_
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#include "nsDiskCacheMap.h"
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#include "nsCacheEntry.h"
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/******************************************************************************
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* nsDiskCacheEntry
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*****************************************************************************/
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struct nsDiskCacheEntry {
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uint32_t mHeaderVersion; // useful for stand-alone metadata files
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uint32_t mMetaLocation; // for verification
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int32_t mFetchCount;
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uint32_t mLastFetched;
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uint32_t mLastModified;
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uint32_t mExpirationTime;
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uint32_t mDataSize;
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uint32_t mKeySize; // includes terminating null byte
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uint32_t mMetaDataSize; // includes terminating null byte
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// followed by key data (mKeySize bytes)
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// followed by meta data (mMetaDataSize bytes)
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uint32_t Size() { return sizeof(nsDiskCacheEntry) +
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mKeySize + mMetaDataSize;
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}
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char* Key() { return reinterpret_cast<char*const>(this) +
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sizeof(nsDiskCacheEntry);
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}
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char* MetaData()
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{ return Key() + mKeySize; }
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nsCacheEntry * CreateCacheEntry(nsCacheDevice * device);
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void Swap() // host to network (memory to disk)
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{
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#if defined(IS_LITTLE_ENDIAN)
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mHeaderVersion = htonl(mHeaderVersion);
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mMetaLocation = htonl(mMetaLocation);
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mFetchCount = htonl(mFetchCount);
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mLastFetched = htonl(mLastFetched);
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mLastModified = htonl(mLastModified);
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mExpirationTime = htonl(mExpirationTime);
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mDataSize = htonl(mDataSize);
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mKeySize = htonl(mKeySize);
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mMetaDataSize = htonl(mMetaDataSize);
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#endif
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}
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void Unswap() // network to host (disk to memory)
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{
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#if defined(IS_LITTLE_ENDIAN)
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mHeaderVersion = ntohl(mHeaderVersion);
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mMetaLocation = ntohl(mMetaLocation);
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mFetchCount = ntohl(mFetchCount);
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mLastFetched = ntohl(mLastFetched);
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mLastModified = ntohl(mLastModified);
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mExpirationTime = ntohl(mExpirationTime);
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mDataSize = ntohl(mDataSize);
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mKeySize = ntohl(mKeySize);
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mMetaDataSize = ntohl(mMetaDataSize);
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#endif
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}
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};
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/******************************************************************************
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* nsDiskCacheEntryInfo
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*****************************************************************************/
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class nsDiskCacheEntryInfo : public nsICacheEntryInfo {
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSICACHEENTRYINFO
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nsDiskCacheEntryInfo(const char * deviceID, nsDiskCacheEntry * diskEntry)
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: mDeviceID(deviceID)
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, mDiskEntry(diskEntry)
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{
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}
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const char* Key() { return mDiskEntry->Key(); }
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private:
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virtual ~nsDiskCacheEntryInfo() {}
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const char * mDeviceID;
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nsDiskCacheEntry * mDiskEntry;
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};
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#endif /* _nsDiskCacheEntry_h_ */
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