The Tor Browser / file comparison
comparison: netwerk/cache/nsDiskCacheBlockFile.h
netwerk/cache/nsDiskCacheBlockFile.h
- branch
- TOR_BUG_9701
- changeset 9
- a63d609f5ebe
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| -1:000000000000 | 0:01daaa03fa17 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* vim: set sw=4 ts=8 et tw=80 : */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef _nsDiskCacheBlockFile_h_ | |
| 8 #define _nsDiskCacheBlockFile_h_ | |
| 9 | |
| 10 #include "mozilla/MemoryReporting.h" | |
| 11 #include "nsIFile.h" | |
| 12 #include "nsDiskCache.h" | |
| 13 | |
| 14 /****************************************************************************** | |
| 15 * nsDiskCacheBlockFile | |
| 16 * | |
| 17 * The structure of a cache block file is a 4096 bytes bit map, followed by | |
| 18 * some number of blocks of mBlockSize. The creator of a | |
| 19 * nsDiskCacheBlockFile object must provide the block size for a given file. | |
| 20 * | |
| 21 *****************************************************************************/ | |
| 22 class nsDiskCacheBlockFile { | |
| 23 public: | |
| 24 nsDiskCacheBlockFile() | |
| 25 : mFD(nullptr) | |
| 26 , mBitMap(nullptr) | |
| 27 , mBlockSize(0) | |
| 28 , mBitMapWords(0) | |
| 29 , mFileSize(0) | |
| 30 , mBitMapDirty(false) | |
| 31 {} | |
| 32 ~nsDiskCacheBlockFile() { (void) Close(true); } | |
| 33 | |
| 34 nsresult Open( nsIFile * blockFile, uint32_t blockSize, | |
| 35 uint32_t bitMapSize, nsDiskCache::CorruptCacheInfo * corruptInfo); | |
| 36 nsresult Close(bool flush); | |
| 37 | |
| 38 /* | |
| 39 * Trim | |
| 40 * Truncates the block file to the end of the last allocated block. | |
| 41 */ | |
| 42 nsresult Trim() { return nsDiskCache::Truncate(mFD, CalcBlockFileSize()); } | |
| 43 nsresult DeallocateBlocks( int32_t startBlock, int32_t numBlocks); | |
| 44 nsresult WriteBlocks( void * buffer, uint32_t size, int32_t numBlocks, | |
| 45 int32_t * startBlock); | |
| 46 nsresult ReadBlocks( void * buffer, int32_t startBlock, int32_t numBlocks, | |
| 47 int32_t * bytesRead); | |
| 48 | |
| 49 size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf); | |
| 50 | |
| 51 private: | |
| 52 nsresult FlushBitMap(); | |
| 53 int32_t AllocateBlocks( int32_t numBlocks); | |
| 54 nsresult VerifyAllocation( int32_t startBlock, int32_t numBLocks); | |
| 55 uint32_t CalcBlockFileSize(); | |
| 56 bool Write(int32_t offset, const void *buf, int32_t amount); | |
| 57 | |
| 58 /** | |
| 59 * Data members | |
| 60 */ | |
| 61 PRFileDesc * mFD; | |
| 62 uint32_t * mBitMap; // XXX future: array of bit map blocks | |
| 63 uint32_t mBlockSize; | |
| 64 uint32_t mBitMapWords; | |
| 65 int32_t mFileSize; | |
| 66 bool mBitMapDirty; | |
| 67 }; | |
| 68 | |
| 69 #endif // _nsDiskCacheBlockFile_h_ |
