| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef MOZC_BASE_BITARRAY_H_ |
| #define MOZC_BASE_BITARRAY_H_ |
| |
| #include <cstring> // memset |
| |
| #include "base/port.h" |
| #include "base/scoped_ptr.h" |
| |
| namespace mozc { |
| |
| class BitArray { |
| public: |
| // Specify the size of bit vector |
| explicit BitArray(uint32 size) : array_(new uint32[1 + (size >> 5)]), |
| size_(size) { |
| memset(reinterpret_cast<char *>(array_.get()), 0, 4 * (1 + (size >> 5))); |
| } |
| |
| ~BitArray() {} |
| |
| // Gets true/false of |index| |
| bool get(uint32 index) const { |
| return static_cast<bool>( |
| (array_[(index >> 5)] >> (index & 0x0000001F)) & 0x00000001); |
| } |
| |
| // Sets the bit at |index| to true. |
| void set(uint32 index) { |
| array_[(index >> 5)] |= 0x00000001 << (index & 0x0000001F); |
| } |
| |
| // Sets the bit at |index| to false. |
| void clear(uint32 index) { |
| array_[(index >> 5)] &= ~(0x00000001 << (index & 0x0000001F)); |
| } |
| |
| // Returns the body of bit vector. |
| const char *array() const { |
| return reinterpret_cast<const char *>(array_.get()); |
| } |
| |
| // Returns the required buffer size for saving the bit vector. |
| size_t array_size() const { |
| return 4 * (1 + (size_ >> 5)); |
| } |
| |
| // Returns the number of bit(s). |
| size_t size() const { |
| return size_; |
| } |
| |
| // Immutable accessor. |
| static bool GetValue(const char *array, uint32 index) { |
| const uint32 *uarray = reinterpret_cast<const uint32 *>(array); |
| return static_cast<bool>( |
| (uarray[(index >> 5)] >> (index & 0x0000001F)) & 0x00000001); |
| } |
| |
| private: |
| scoped_ptr<uint32[]> array_; |
| const size_t size_; |
| |
| DISALLOW_COPY_AND_ASSIGN(BitArray); |
| }; |
| |
| } // namespace mozc |
| |
| #endif // MOZC_BASE_BITARRAY_H_ |