Index: net/disk_cache/blockfile/bitmap.h |
diff --git a/net/disk_cache/blockfile/bitmap.h b/net/disk_cache/blockfile/bitmap.h |
deleted file mode 100644 |
index dc05157f7a4400a8ea1c3268764d6fb309864d86..0000000000000000000000000000000000000000 |
--- a/net/disk_cache/blockfile/bitmap.h |
+++ /dev/null |
@@ -1,136 +0,0 @@ |
-// Copyright (c) 2011 The Chromium Authors. All rights reserved. |
-// Use of this source code is governed by a BSD-style license that can be |
-// found in the LICENSE file. |
- |
-#ifndef NET_DISK_CACHE_BLOCKFILE_BITMAP_H_ |
-#define NET_DISK_CACHE_BLOCKFILE_BITMAP_H_ |
- |
-#include "base/basictypes.h" |
-#include "net/base/net_export.h" |
- |
-namespace disk_cache { |
- |
-// This class provides support for simple maps of bits. |
-class NET_EXPORT_PRIVATE Bitmap { |
- public: |
- Bitmap() : map_(NULL), num_bits_(0), array_size_(0), alloc_(false) {} |
- |
- // This constructor will allocate on a uint32 boundary. If |clear_bits| is |
- // false, the bitmap bits will not be initialized. |
- Bitmap(int num_bits, bool clear_bits); |
- |
- // Constructs a Bitmap with the actual storage provided by the caller. |map| |
- // has to be valid until this object destruction. |num_bits| is the number of |
- // bits in the bitmap, and |num_words| is the size of |map| in 32-bit words. |
- Bitmap(uint32* map, int num_bits, int num_words); |
- |
- ~Bitmap(); |
- |
- // Resizes the bitmap. |
- // If |num_bits| < Size(), the extra bits will be discarded. |
- // If |num_bits| > Size(), the extra bits will be filled with zeros if |
- // |clear_bits| is true. |
- // This object cannot be using memory provided during construction. |
- void Resize(int num_bits, bool clear_bits); |
- |
- // Returns the number of bits in the bitmap. |
- int Size() const { return num_bits_; } |
- |
- // Returns the number of 32-bit words in the bitmap. |
- int ArraySize() const { return array_size_; } |
- |
- // Sets all the bits to true or false. |
- void SetAll(bool value) { |
- memset(map_, (value ? 0xFF : 0x00), array_size_ * sizeof(*map_)); |
- } |
- |
- // Clears all bits in the bitmap |
- void Clear() { SetAll(false); } |
- |
- // Sets the value, gets the value or toggles the value of a given bit. |
- void Set(int index, bool value); |
- bool Get(int index) const; |
- void Toggle(int index); |
- |
- // Directly sets an element of the internal map. Requires |array_index| < |
- // ArraySize(); |
- void SetMapElement(int array_index, uint32 value); |
- |
- // Gets an entry of the internal map. Requires array_index < |
- // ArraySize() |
- uint32 GetMapElement(int array_index) const; |
- |
- // Directly sets the whole internal map. |size| is the number of 32-bit words |
- // to set from |map|. If |size| > array_size(), it ignores the end of |map|. |
- void SetMap(const uint32* map, int size); |
- |
- // Gets a pointer to the internal map. |
- const uint32* GetMap() const { return map_; } |
- |
- // Sets a range of bits to |value|. |
- void SetRange(int begin, int end, bool value); |
- |
- // Returns true if any bit between begin inclusive and end exclusive is set. |
- // 0 <= |begin| <= |end| <= Size() is required. |
- bool TestRange(int begin, int end, bool value) const; |
- |
- // Scans bits starting at bit *|index|, looking for a bit set to |value|. If |
- // it finds that bit before reaching bit index |limit|, sets *|index| to the |
- // bit index and returns true. Otherwise returns false. |
- // Requires |limit| <= Size(). |
- // |
- // Note that to use these methods in a loop you must increment the index |
- // after each use, as in: |
- // |
- // for (int index = 0 ; map.FindNextBit(&index, limit, value) ; ++index) { |
- // DoSomethingWith(index); |
- // } |
- bool FindNextBit(int* index, int limit, bool value) const; |
- |
- // Finds the first offset >= *|index| and < |limit| that has its bit set. |
- // See FindNextBit() for more info. |
- bool FindNextSetBitBeforeLimit(int* index, int limit) const { |
- return FindNextBit(index, limit, true); |
- } |
- |
- // Finds the first offset >= *|index| that has its bit set. |
- // See FindNextBit() for more info. |
- bool FindNextSetBit(int *index) const { |
- return FindNextSetBitBeforeLimit(index, num_bits_); |
- } |
- |
- // Scans bits starting at bit *|index|, looking for a bit set to |value|. If |
- // it finds that bit before reaching bit index |limit|, sets *|index| to the |
- // bit index and then counts the number of consecutive bits set to |value| |
- // (before reaching |limit|), and returns that count. If no bit is found |
- // returns 0. Requires |limit| <= Size(). |
- int FindBits(int* index, int limit, bool value) const; |
- |
- // Returns number of allocated words required for a bitmap of size |num_bits|. |
- static int RequiredArraySize(int num_bits) { |
- // Force at least one allocated word. |
- if (num_bits <= kIntBits) |
- return 1; |
- |
- return (num_bits + kIntBits - 1) >> kLogIntBits; |
- } |
- |
- private: |
- static const int kIntBits = sizeof(uint32) * 8; |
- static const int kLogIntBits = 5; // 2^5 == 32 bits per word. |
- |
- // Sets |len| bits from |start| to |value|. All the bits to be set should be |
- // stored in the same word, and len < kIntBits. |
- void SetWordBits(int start, int len, bool value); |
- |
- uint32* map_; // The bitmap. |
- int num_bits_; // The upper bound of the bitmap. |
- int array_size_; // The physical size (in uint32s) of the bitmap. |
- bool alloc_; // Whether or not we allocated the memory. |
- |
- DISALLOW_COPY_AND_ASSIGN(Bitmap); |
-}; |
- |
-} // namespace disk_cache |
- |
-#endif // NET_DISK_CACHE_BLOCKFILE_BITMAP_H_ |