1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/netwerk/cache/nsDiskCacheBlockFile.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,69 @@
1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
1.5 +/* vim: set sw=4 ts=8 et tw=80 : */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef _nsDiskCacheBlockFile_h_
1.11 +#define _nsDiskCacheBlockFile_h_
1.12 +
1.13 +#include "mozilla/MemoryReporting.h"
1.14 +#include "nsIFile.h"
1.15 +#include "nsDiskCache.h"
1.16 +
1.17 +/******************************************************************************
1.18 + * nsDiskCacheBlockFile
1.19 + *
1.20 + * The structure of a cache block file is a 4096 bytes bit map, followed by
1.21 + * some number of blocks of mBlockSize. The creator of a
1.22 + * nsDiskCacheBlockFile object must provide the block size for a given file.
1.23 + *
1.24 + *****************************************************************************/
1.25 +class nsDiskCacheBlockFile {
1.26 +public:
1.27 + nsDiskCacheBlockFile()
1.28 + : mFD(nullptr)
1.29 + , mBitMap(nullptr)
1.30 + , mBlockSize(0)
1.31 + , mBitMapWords(0)
1.32 + , mFileSize(0)
1.33 + , mBitMapDirty(false)
1.34 + {}
1.35 + ~nsDiskCacheBlockFile() { (void) Close(true); }
1.36 +
1.37 + nsresult Open( nsIFile * blockFile, uint32_t blockSize,
1.38 + uint32_t bitMapSize, nsDiskCache::CorruptCacheInfo * corruptInfo);
1.39 + nsresult Close(bool flush);
1.40 +
1.41 + /*
1.42 + * Trim
1.43 + * Truncates the block file to the end of the last allocated block.
1.44 + */
1.45 + nsresult Trim() { return nsDiskCache::Truncate(mFD, CalcBlockFileSize()); }
1.46 + nsresult DeallocateBlocks( int32_t startBlock, int32_t numBlocks);
1.47 + nsresult WriteBlocks( void * buffer, uint32_t size, int32_t numBlocks,
1.48 + int32_t * startBlock);
1.49 + nsresult ReadBlocks( void * buffer, int32_t startBlock, int32_t numBlocks,
1.50 + int32_t * bytesRead);
1.51 +
1.52 + size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf);
1.53 +
1.54 +private:
1.55 + nsresult FlushBitMap();
1.56 + int32_t AllocateBlocks( int32_t numBlocks);
1.57 + nsresult VerifyAllocation( int32_t startBlock, int32_t numBLocks);
1.58 + uint32_t CalcBlockFileSize();
1.59 + bool Write(int32_t offset, const void *buf, int32_t amount);
1.60 +
1.61 +/**
1.62 + * Data members
1.63 + */
1.64 + PRFileDesc * mFD;
1.65 + uint32_t * mBitMap; // XXX future: array of bit map blocks
1.66 + uint32_t mBlockSize;
1.67 + uint32_t mBitMapWords;
1.68 + int32_t mFileSize;
1.69 + bool mBitMapDirty;
1.70 +};
1.71 +
1.72 +#endif // _nsDiskCacheBlockFile_h_
