net/disk_cache/blockfile/addr.cc

   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
   9 namespace disk_cache {
  10
  11 int Addr::start_block() const {
  12   DCHECK(is_block_file());
  13   return value_ & kStartBlockMask;
  14 }
  15
  16 int Addr::num_blocks() const {
  17   DCHECK(is_block_file() || !value_);
  18   return ((value_ & kNumBlocksMask) >> kNumBlocksOffset) + 1;
  19 }
  20
  21 bool 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
  29 bool 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
  42 bool 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
  56 bool 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
  66 bool 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
  82 bool 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