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
3// found in the LICENSE file.
4
5#include "net/disk_cache/blockfile/addr.h"
6
7#include "base/logging.h"
8
9namespace disk_cache {
10
11int Addr::start_block() const {
12  DCHECK(is_block_file());
13  return value_ & kStartBlockMask;
14}
15
16int Addr::num_blocks() const {
17  DCHECK(is_block_file() || !value_);
18  return ((value_ & kNumBlocksMask) >> kNumBlocksOffset) + 1;
19}
20
21bool Addr::SetFileNumber(int file_number) {
22  DCHECK(is_separate_file());
23  if (file_number & ~kFileNameMask)
24    return false;
25  value_ = kInitializedMask | file_number;
26  return true;
27}
28
29bool Addr::SanityCheckV2() const {
30  if (!is_initialized())
31    return !value_;
32
33  if (file_type() > BLOCK_4K)
34    return false;
35
36  if (is_separate_file())
37    return true;
38
39  return !reserved_bits();
40}
41
42bool Addr::SanityCheckV3() const {
43  if (!is_initialized())
44    return !value_;
45
46  // For actual entries, SanityCheckForEntryV3 should be used.
47  if (file_type() > BLOCK_FILES)
48    return false;
49
50  if (is_separate_file())
51    return true;
52
53  return !reserved_bits();
54}
55
56bool Addr::SanityCheckForEntryV2() const {
57  if (!SanityCheckV2() || !is_initialized())
58    return false;
59
60  if (is_separate_file() || file_type() != BLOCK_256)
61    return false;
62
63  return true;
64}
65
66bool Addr::SanityCheckForEntryV3() const {
67  if (!is_initialized())
68    return false;
69
70  if (reserved_bits())
71    return false;
72
73  if (file_type() != BLOCK_ENTRIES && file_type() != BLOCK_EVICTED)
74    return false;
75
76  if (num_blocks() != 1)
77    return false;
78
79  return true;
80}
81
82bool Addr::SanityCheckForRankings() const {
83  if (!SanityCheckV2() || !is_initialized())
84    return false;
85
86  if (is_separate_file() || file_type() != RANKINGS || num_blocks() != 1)
87    return false;
88
89  return true;
90}
91
92}  // namespace disk_cache
93