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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 #include "net/disk_cache/addr.h" | 5 #include "net/disk_cache/addr.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 | 8 |
9 namespace { | |
10 | |
11 bool AreReservedBitsValid(uint32 value) { | |
gavinp
2013/06/16 23:44:15
Make this an inline getter.
| |
12 // These two bits of a block address should not be set. | |
13 const uint32 kReservedBitsMask = 0x0c000000; | |
gavinp
2013/06/16 23:44:15
Move this into the header.
| |
14 return !(value & kReservedBitsMask); | |
15 } | |
16 | |
17 } // namespace | |
18 | |
9 namespace disk_cache { | 19 namespace disk_cache { |
10 | 20 |
11 int Addr::start_block() const { | 21 int Addr::start_block() const { |
12 DCHECK(is_block_file()); | 22 DCHECK(is_block_file()); |
13 return value_ & kStartBlockMask; | 23 return value_ & kStartBlockMask; |
14 } | 24 } |
15 | 25 |
16 int Addr::num_blocks() const { | 26 int Addr::num_blocks() const { |
17 DCHECK(is_block_file() || !value_); | 27 DCHECK(is_block_file() || !value_); |
18 return ((value_ & kNumBlocksMask) >> kNumBlocksOffset) + 1; | 28 return ((value_ & kNumBlocksMask) >> kNumBlocksOffset) + 1; |
19 } | 29 } |
20 | 30 |
21 bool Addr::SetFileNumber(int file_number) { | 31 bool Addr::SetFileNumber(int file_number) { |
22 DCHECK(is_separate_file()); | 32 DCHECK(is_separate_file()); |
23 if (file_number & ~kFileNameMask) | 33 if (file_number & ~kFileNameMask) |
24 return false; | 34 return false; |
25 value_ = kInitializedMask | file_number; | 35 value_ = kInitializedMask | file_number; |
26 return true; | 36 return true; |
27 } | 37 } |
28 | 38 |
29 bool Addr::SanityCheck() const { | 39 bool Addr::SanityCheckV2() const { |
30 if (!is_initialized()) | 40 if (!is_initialized()) |
31 return !value_; | 41 return !value_; |
32 | 42 |
33 if (((value_ & kFileTypeMask) >> kFileTypeOffset) > 4) | 43 if (file_type() > BLOCK_4K) |
34 return false; | 44 return false; |
35 | 45 |
36 if (is_separate_file()) | 46 if (is_separate_file()) |
37 return true; | 47 return true; |
38 | 48 |
39 const uint32 kReservedBitsMask = 0x0c000000; | 49 return AreReservedBitsValid(value_); |
40 return !(value_ & kReservedBitsMask); | 50 } |
51 | |
52 bool Addr::SanityCheckV3() const { | |
53 if (!is_initialized()) | |
54 return !value_; | |
55 | |
56 // For actual entries, SanityCheckForEntryV3 should be used. | |
57 if (file_type() > BLOCK_FILES) | |
58 return false; | |
59 | |
60 if (is_separate_file()) | |
61 return true; | |
62 | |
63 return AreReservedBitsValid(value_); | |
41 } | 64 } |
42 | 65 |
43 bool Addr::SanityCheckForEntryV2() const { | 66 bool Addr::SanityCheckForEntryV2() const { |
44 if (!SanityCheck() || !is_initialized()) | 67 if (!SanityCheckV2() || !is_initialized()) |
45 return false; | 68 return false; |
46 | 69 |
47 if (is_separate_file() || file_type() != BLOCK_256) | 70 if (is_separate_file() || file_type() != BLOCK_256) |
48 return false; | 71 return false; |
49 | 72 |
50 return true; | 73 return true; |
51 } | 74 } |
52 | 75 |
76 bool Addr::SanityCheckForEntryV3() const { | |
77 if (!is_initialized()) | |
78 return false; | |
79 | |
80 if (!AreReservedBitsValid(value_)) | |
81 return false; | |
82 | |
83 if (file_type() != BLOCK_ENTRIES && file_type() != BLOCK_EVICTED) | |
84 return false; | |
85 | |
86 if (num_blocks() != 1) | |
87 return false; | |
88 | |
89 return true; | |
90 } | |
91 | |
53 bool Addr::SanityCheckForRankings() const { | 92 bool Addr::SanityCheckForRankings() const { |
54 if (!SanityCheck() || !is_initialized()) | 93 if (!SanityCheckV2() || !is_initialized()) |
55 return false; | 94 return false; |
56 | 95 |
57 if (is_separate_file() || file_type() != RANKINGS || num_blocks() != 1) | 96 if (is_separate_file() || file_type() != RANKINGS || num_blocks() != 1) |
58 return false; | 97 return false; |
59 | 98 |
60 return true; | 99 return true; |
61 } | 100 } |
62 | 101 |
63 } // namespace disk_cache | 102 } // namespace disk_cache |
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