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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be | 
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. | 
| 4 | 4 | 
| 5 // This is an internal class that handles the address of a cache record. | 5 // This is an internal class that handles the address of a cache record. | 
| 6 // See net/disk_cache/disk_cache.h for the public interface of the cache. | 6 // See net/disk_cache/disk_cache.h for the public interface of the cache. | 
| 7 | 7 | 
| 8 #ifndef NET_DISK_CACHE_BLOCKFILE_ADDR_H_ | 8 #ifndef NET_DISK_CACHE_BLOCKFILE_ADDR_H_ | 
| 9 #define NET_DISK_CACHE_BLOCKFILE_ADDR_H_ | 9 #define NET_DISK_CACHE_BLOCKFILE_ADDR_H_ | 
| 10 | 10 | 
|  | 11 #include <stddef.h> | 
|  | 12 #include <stdint.h> | 
|  | 13 | 
| 11 #include "net/base/net_export.h" | 14 #include "net/base/net_export.h" | 
| 12 #include "net/disk_cache/blockfile/disk_format_base.h" | 15 #include "net/disk_cache/blockfile/disk_format_base.h" | 
| 13 | 16 | 
| 14 namespace disk_cache { | 17 namespace disk_cache { | 
| 15 | 18 | 
| 16 enum FileType { | 19 enum FileType { | 
| 17   EXTERNAL = 0, | 20   EXTERNAL = 0, | 
| 18   RANKINGS = 1, | 21   RANKINGS = 1, | 
| 19   BLOCK_256 = 2, | 22   BLOCK_256 = 2, | 
| 20   BLOCK_1K = 3, | 23   BLOCK_1K = 3, | 
| 21   BLOCK_4K = 4, | 24   BLOCK_4K = 4, | 
| 22   BLOCK_FILES = 5, | 25   BLOCK_FILES = 5, | 
| 23   BLOCK_ENTRIES = 6, | 26   BLOCK_ENTRIES = 6, | 
| 24   BLOCK_EVICTED = 7 | 27   BLOCK_EVICTED = 7 | 
| 25 }; | 28 }; | 
| 26 | 29 | 
| 27 const int kMaxBlockSize = 4096 * 4; | 30 const int kMaxBlockSize = 4096 * 4; | 
| 28 const int16 kMaxBlockFile = 255; | 31 const int16_t kMaxBlockFile = 255; | 
| 29 const int kMaxNumBlocks = 4; | 32 const int kMaxNumBlocks = 4; | 
| 30 const int16 kFirstAdditionalBlockFile = 4; | 33 const int16_t kFirstAdditionalBlockFile = 4; | 
| 31 const size_t kFirstAdditionalBlockFileV3 = 7; | 34 const size_t kFirstAdditionalBlockFileV3 = 7; | 
| 32 | 35 | 
| 33 // Defines a storage address for a cache record | 36 // Defines a storage address for a cache record | 
| 34 // | 37 // | 
| 35 // Header: | 38 // Header: | 
| 36 //   1000 0000 0000 0000 0000 0000 0000 0000 : initialized bit | 39 //   1000 0000 0000 0000 0000 0000 0000 0000 : initialized bit | 
| 37 //   0111 0000 0000 0000 0000 0000 0000 0000 : file type | 40 //   0111 0000 0000 0000 0000 0000 0000 0000 : file type | 
| 38 // | 41 // | 
| 39 // File type values: | 42 // File type values: | 
| 40 //   0 = separate file on disk | 43 //   0 = separate file on disk | 
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| 158   } | 161   } | 
| 159 | 162 | 
| 160   // Returns true if this address looks like a valid one. | 163   // Returns true if this address looks like a valid one. | 
| 161   bool SanityCheckV2() const; | 164   bool SanityCheckV2() const; | 
| 162   bool SanityCheckV3() const; | 165   bool SanityCheckV3() const; | 
| 163   bool SanityCheckForEntryV2() const; | 166   bool SanityCheckForEntryV2() const; | 
| 164   bool SanityCheckForEntryV3() const; | 167   bool SanityCheckForEntryV3() const; | 
| 165   bool SanityCheckForRankings() const; | 168   bool SanityCheckForRankings() const; | 
| 166 | 169 | 
| 167  private: | 170  private: | 
| 168   uint32 reserved_bits() const { | 171   uint32_t reserved_bits() const { return value_ & kReservedBitsMask; } | 
| 169     return value_ & kReservedBitsMask; |  | 
| 170   } |  | 
| 171 | 172 | 
| 172   static const uint32 kInitializedMask    = 0x80000000; | 173   static const uint32_t kInitializedMask = 0x80000000; | 
| 173   static const uint32 kFileTypeMask       = 0x70000000; | 174   static const uint32_t kFileTypeMask = 0x70000000; | 
| 174   static const uint32 kFileTypeOffset     = 28; | 175   static const uint32_t kFileTypeOffset = 28; | 
| 175   static const uint32 kReservedBitsMask   = 0x0c000000; | 176   static const uint32_t kReservedBitsMask = 0x0c000000; | 
| 176   static const uint32 kNumBlocksMask      = 0x03000000; | 177   static const uint32_t kNumBlocksMask = 0x03000000; | 
| 177   static const uint32 kNumBlocksOffset    = 24; | 178   static const uint32_t kNumBlocksOffset = 24; | 
| 178   static const uint32 kFileSelectorMask   = 0x00ff0000; | 179   static const uint32_t kFileSelectorMask = 0x00ff0000; | 
| 179   static const uint32 kFileSelectorOffset = 16; | 180   static const uint32_t kFileSelectorOffset = 16; | 
| 180   static const uint32 kStartBlockMask     = 0x0000FFFF; | 181   static const uint32_t kStartBlockMask = 0x0000FFFF; | 
| 181   static const uint32 kFileNameMask       = 0x0FFFFFFF; | 182   static const uint32_t kFileNameMask = 0x0FFFFFFF; | 
| 182 | 183 | 
| 183   CacheAddr value_; | 184   CacheAddr value_; | 
| 184 }; | 185 }; | 
| 185 | 186 | 
| 186 }  // namespace disk_cache | 187 }  // namespace disk_cache | 
| 187 | 188 | 
| 188 #endif  // NET_DISK_CACHE_BLOCKFILE_ADDR_H_ | 189 #endif  // NET_DISK_CACHE_BLOCKFILE_ADDR_H_ | 
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