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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2008 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_ADDR_H_ | 8 #ifndef NET_DISK_CACHE_ADDR_H_ |
| 9 #define NET_DISK_CACHE_ADDR_H_ | 9 #define NET_DISK_CACHE_ADDR_H_ |
| 10 | 10 |
| 11 #include "net/disk_cache/disk_format.h" | 11 #include "net/disk_cache/disk_format.h" |
| 12 | 12 |
| 13 namespace disk_cache { | 13 namespace disk_cache { |
| 14 | 14 |
| 15 enum FileType { | 15 enum FileType { |
| 16 EXTERNAL = 0, | 16 EXTERNAL = 0, |
| 17 RANKINGS = 1, | 17 RANKINGS = 1, |
| 18 BLOCK_256, | 18 BLOCK_256, |
| 19 BLOCK_1K, | 19 BLOCK_1K, |
| 20 BLOCK_4K, | 20 BLOCK_4K, |
| 21 }; | 21 }; |
| 22 | 22 |
| 23 const int kMaxBlockSize = 4096 * 4; | 23 const int kMaxBlockSize = 4096 * 4; |
| 24 const int kMaxBlockFile = 255; | 24 const int kMaxBlockFile = 255; |
| 25 const int kMaxNumBlocks = 4; | 25 const int kMaxNumBlocks = 4; |
| 26 const int kFirstAdditionlBlockFile = 4; | 26 const int kFirstAdditionalBlockFile = 4; |
| 27 | 27 |
| 28 // Defines a storage address for a cache record | 28 // Defines a storage address for a cache record |
| 29 // | 29 // |
| 30 // Header: | 30 // Header: |
| 31 // 1000 0000 0000 0000 0000 0000 0000 0000 : initialized bit | 31 // 1000 0000 0000 0000 0000 0000 0000 0000 : initialized bit |
| 32 // 0111 0000 0000 0000 0000 0000 0000 0000 : file type | 32 // 0111 0000 0000 0000 0000 0000 0000 0000 : file type |
| 33 // | 33 // |
| 34 // File type values: | 34 // File type values: |
| 35 // 0 = separate file on disk | 35 // 0 = separate file on disk |
| 36 // 1 = rankings block file | 36 // 1 = rankings block file |
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| 128 static const uint32 kFileSelectorOffset = 16; | 128 static const uint32 kFileSelectorOffset = 16; |
| 129 static const uint32 kStartBlockMask = 0x0000FFFF; | 129 static const uint32 kStartBlockMask = 0x0000FFFF; |
| 130 static const uint32 kFileNameMask = 0x0FFFFFFF; | 130 static const uint32 kFileNameMask = 0x0FFFFFFF; |
| 131 | 131 |
| 132 CacheAddr value_; | 132 CacheAddr value_; |
| 133 }; | 133 }; |
| 134 | 134 |
| 135 } // namespace disk_cache | 135 } // namespace disk_cache |
| 136 | 136 |
| 137 #endif // NET_DISK_CACHE_ADDR_H_ | 137 #endif // NET_DISK_CACHE_ADDR_H_ |
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