1 // Copyright (c) 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_H_ 6 #define NET_DISK_CACHE_SIMPLE_SIMPLE_ENTRY_FORMAT_H_ 7 8 9 #include "base/basictypes.h" 10 #include "base/port.h" 11 #include "net/base/net_export.h" 12 13 namespace base { 14 class Time; 15 } 16 17 namespace disk_cache { 18 19 const uint64 kSimpleInitialMagicNumber = GG_UINT64_C(0xfcfb6d1ba7725c30); 20 const uint64 kSimpleFinalMagicNumber = GG_UINT64_C(0xf4fa6f45970d41d8); 21 const uint64 kSimpleSparseRangeMagicNumber = GG_UINT64_C(0xeb97bf016553676b); 22 23 // A file containing stream 0 and stream 1 in the Simple cache consists of: 24 // - a SimpleFileHeader. 25 // - the key. 26 // - the data from stream 1. 27 // - a SimpleFileEOF record for stream 1. 28 // - the data from stream 0. 29 // - a SimpleFileEOF record for stream 0. 30 31 // A file containing stream 2 in the Simple cache consists of: 32 // - a SimpleFileHeader. 33 // - the key. 34 // - the data. 35 // - at the end, a SimpleFileEOF record. 36 static const int kSimpleEntryFileCount = 2; 37 static const int kSimpleEntryStreamCount = 3; 38 39 struct NET_EXPORT_PRIVATE SimpleFileHeader { 40 SimpleFileHeader(); 41 42 uint64 initial_magic_number; 43 uint32 version; 44 uint32 key_length; 45 uint32 key_hash; 46 }; 47 48 struct NET_EXPORT_PRIVATE SimpleFileEOF { 49 enum Flags { 50 FLAG_HAS_CRC32 = (1U << 0), 51 }; 52 53 SimpleFileEOF(); 54 55 uint64 final_magic_number; 56 uint32 flags; 57 uint32 data_crc32; 58 // |stream_size| is only used in the EOF record for stream 0. 59 uint32 stream_size; 60 }; 61 62 struct SimpleFileSparseRangeHeader { 63 SimpleFileSparseRangeHeader(); 64 65 uint64 sparse_range_magic_number; 66 int64 offset; 67 int64 length; 68 uint32 data_crc32; 69 }; 70 71 } // namespace disk_cache 72 73 #endif // NET_DISK_CACHE_SIMPLE_SIMPLE_ENTRY_FORMAT_H_ 74