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66 lines
2.4 KiB
C++
66 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim: set sw=4 ts=8 et tw=80 : */
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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 _nsDiskCacheBlockFile_h_
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#define _nsDiskCacheBlockFile_h_
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#include "nsIFile.h"
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/******************************************************************************
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* nsDiskCacheBlockFile
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*
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* The structure of a cache block file is a 4096 bytes bit map, followed by
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* some number of blocks of mBlockSize. The creator of a
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* nsDiskCacheBlockFile object must provide the block size for a given file.
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*
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*****************************************************************************/
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class nsDiskCacheBlockFile {
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public:
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nsDiskCacheBlockFile()
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: mFD(nsnull)
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, mBitMap(nsnull)
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, mBlockSize(0)
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, mBitMapWords(0)
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, mFileSize(0)
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, mBitMapDirty(false)
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{}
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~nsDiskCacheBlockFile() { (void) Close(true); }
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nsresult Open( nsIFile * blockFile, PRUint32 blockSize,
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PRUint32 bitMapSize);
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nsresult Close(bool flush);
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/*
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* Trim
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* Truncates the block file to the end of the last allocated block.
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*/
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nsresult Trim() { return nsDiskCache::Truncate(mFD, CalcBlockFileSize()); }
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nsresult DeallocateBlocks( PRInt32 startBlock, PRInt32 numBlocks);
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nsresult WriteBlocks( void * buffer, PRUint32 size, PRInt32 numBlocks,
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PRInt32 * startBlock);
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nsresult ReadBlocks( void * buffer, PRInt32 startBlock, PRInt32 numBlocks,
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PRInt32 * bytesRead);
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private:
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nsresult FlushBitMap();
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PRInt32 AllocateBlocks( PRInt32 numBlocks);
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nsresult VerifyAllocation( PRInt32 startBlock, PRInt32 numBLocks);
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PRUint32 CalcBlockFileSize();
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bool Write(PRInt32 offset, const void *buf, PRInt32 amount);
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/**
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* Data members
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*/
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PRFileDesc * mFD;
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PRUint32 * mBitMap; // XXX future: array of bit map blocks
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PRUint32 mBlockSize;
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PRUint32 mBitMapWords;
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PRInt32 mFileSize;
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bool mBitMapDirty;
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};
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#endif // _nsDiskCacheBlockFile_h_
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