1// Copyright (c) 2011 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/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::SanityCheck() const {
30  if (!is_initialized())
31    return !value_;
32
33  if (((value_ & kFileTypeMask) >> kFileTypeOffset) > 4)
34    return false;
35
36  if (is_separate_file())
37    return true;
38
39  const uint32 kReservedBitsMask = 0x0c000000;
40  return !(value_ & kReservedBitsMask);
41}
42
43}  // namespace disk_cache
44