1 // Copyright 2013 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_SIMPLE_SIMPLE_ENTRY_FORMAT_HISTORY_H_ 6 #define NET_DISK_CACHE_SIMPLE_SIMPLE_ENTRY_FORMAT_HISTORY_H_ 7 8 #include "base/basictypes.h" 9 #include "base/port.h" 10 #include "net/base/net_export.h" 11 12 namespace disk_cache { 13 14 namespace simplecache_v5 { 15 16 const uint64 kSimpleInitialMagicNumber = GG_UINT64_C(0xfcfb6d1ba7725c30); 17 const uint64 kSimpleFinalMagicNumber = GG_UINT64_C(0xf4fa6f45970d41d8); 18 19 // A file containing stream 0 and stream 1 in the Simple cache consists of: 20 // - a SimpleFileHeader. 21 // - the key. 22 // - the data from stream 1. 23 // - a SimpleFileEOF record for stream 1. 24 // - the data from stream 0. 25 // - a SimpleFileEOF record for stream 0. 26 27 // A file containing stream 2 in the Simple cache consists of: 28 // - a SimpleFileHeader. 29 // - the key. 30 // - the data. 31 // - at the end, a SimpleFileEOF record. 32 static const int kSimpleEntryFileCount = 2; 33 static const int kSimpleEntryStreamCount = 3; 34 35 struct NET_EXPORT_PRIVATE SimpleFileHeader { 36 SimpleFileHeader(); 37 38 uint64 initial_magic_number; 39 uint32 version; 40 uint32 key_length; 41 uint32 key_hash; 42 }; 43 44 struct NET_EXPORT_PRIVATE SimpleFileEOF { 45 enum Flags { 46 FLAG_HAS_CRC32 = (1U << 0), 47 }; 48 49 SimpleFileEOF(); 50 51 uint64 final_magic_number; 52 uint32 flags; 53 uint32 data_crc32; 54 // |stream_size| is only used in the EOF record for stream 0. 55 uint32 stream_size; 56 }; 57 58 } // namespace simplecache_v5 59 60 } // namespace disk_cache 61 62 #endif // NET_DISK_CACHE_SIMPLE_SIMPLE_ENTRY_FORMAT_HISTORY_H_ 63