1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_DISK_CACHE_FLASH_FORMAT_H_ 6 #define NET_DISK_CACHE_FLASH_FORMAT_H_ 7 8 namespace disk_cache { 9 10 // Storage constants. 11 const int32 kFlashPageSize = 8 * 1024; 12 const int32 kFlashBlockSize = 512 * kFlashPageSize; 13 14 // Segment constants. 15 const int32 kFlashSegmentSize = 4 * 1024 * 1024; 16 const int32 kFlashSmallEntrySize = 4 * 1024; 17 const size_t kFlashMaxEntryCount = kFlashSegmentSize / kFlashSmallEntrySize - 1; 18 19 // Segment summary consists of a fixed region at the end of the segment 20 // containing a counter specifying the number of saved offsets followed by the 21 // offsets. 22 const int32 kFlashSummarySize = (1 + kFlashMaxEntryCount) * sizeof(int32); 23 const int32 kFlashSegmentFreeSpace = kFlashSegmentSize - kFlashSummarySize; 24 25 // An entry consists of a fixed number of streams. 26 const int32 kFlashLogStoreEntryNumStreams = 4; 27 const int32 kFlashLogStoreEntryHeaderSize = 28 kFlashLogStoreEntryNumStreams * sizeof(int32); 29 30 } // namespace disk_cache 31 32 #endif // NET_DISK_CACHE_FLASH_FORMAT_H_ 33
