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1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2009 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/bitmap.h" | 5 #include "net/disk_cache/bitmap.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 | 8 |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 | 10 |
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29 // Returns the index of the first bit set to |value| from |word|. This code | 29 // Returns the index of the first bit set to |value| from |word|. This code |
30 // assumes that we'll be able to find that bit. | 30 // assumes that we'll be able to find that bit. |
31 int FindLSBNonEmpty(uint32 word, bool value) { | 31 int FindLSBNonEmpty(uint32 word, bool value) { |
32 // If we are looking for 0, negate |word| and look for 1. | 32 // If we are looking for 0, negate |word| and look for 1. |
33 if (!value) | 33 if (!value) |
34 word = ~word; | 34 word = ~word; |
35 | 35 |
36 return FindLSBSetNonZero(word); | 36 return FindLSBSetNonZero(word); |
37 } | 37 } |
38 | 38 |
39 } | 39 } // namespace |
40 | 40 |
41 namespace disk_cache { | 41 namespace disk_cache { |
42 | 42 |
43 Bitmap::Bitmap(int num_bits, bool clear_bits) | 43 Bitmap::Bitmap(int num_bits, bool clear_bits) |
44 : num_bits_(num_bits), | 44 : num_bits_(num_bits), |
45 array_size_(RequiredArraySize(num_bits)), | 45 array_size_(RequiredArraySize(num_bits)), |
46 alloc_(true) { | 46 alloc_(true) { |
47 map_ = new uint32[array_size_]; | 47 map_ = new uint32[array_size_]; |
48 | 48 |
49 // Initialize all of the bits. | 49 // Initialize all of the bits. |
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98 map_[j] |= (1 << i); | 98 map_[j] |= (1 << i); |
99 else | 99 else |
100 map_[j] &= ~(1 << i); | 100 map_[j] &= ~(1 << i); |
101 } | 101 } |
102 | 102 |
103 bool Bitmap::Get(int index) const { | 103 bool Bitmap::Get(int index) const { |
104 DCHECK_LT(index, num_bits_); | 104 DCHECK_LT(index, num_bits_); |
105 DCHECK_GE(index, 0); | 105 DCHECK_GE(index, 0); |
106 const int i = index & (kIntBits-1); | 106 const int i = index & (kIntBits-1); |
107 const int j = index / kIntBits; | 107 const int j = index / kIntBits; |
108 return map_[j] & (1 << i) ? true : false; | 108 return ((map_[j] & (1 << i)) != 0); |
109 } | 109 } |
110 | 110 |
111 void Bitmap::Toggle(int index) { | 111 void Bitmap::Toggle(int index) { |
112 DCHECK_LT(index, num_bits_); | 112 DCHECK_LT(index, num_bits_); |
113 DCHECK_GE(index, 0); | 113 DCHECK_GE(index, 0); |
114 const int i = index & (kIntBits - 1); | 114 const int i = index & (kIntBits - 1); |
115 const int j = index / kIntBits; | 115 const int j = index / kIntBits; |
116 map_[j] ^= (1 << i); | 116 map_[j] ^= (1 << i); |
117 } | 117 } |
118 | 118 |
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302 uint32 to_add = 0xffffffff << len; | 302 uint32 to_add = 0xffffffff << len; |
303 to_add = (~to_add) << offset; | 303 to_add = (~to_add) << offset; |
304 if (value) { | 304 if (value) { |
305 map_[word] |= to_add; | 305 map_[word] |= to_add; |
306 } else { | 306 } else { |
307 map_[word] &= ~to_add; | 307 map_[word] &= ~to_add; |
308 } | 308 } |
309 } | 309 } |
310 | 310 |
311 } // namespace disk_cache | 311 } // namespace disk_cache |
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