1 /* 2 * Copyright (C) 2012 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef BitArray_h 27 #define BitArray_h 28 29 #include <string.h> 30 #include "wtf/Assertions.h" 31 32 namespace WTF { 33 34 template<unsigned arraySize> 35 class BitArray { 36 public: 37 BitArray(bool value = false) 38 { 39 memset(m_data, value ? 0xFF : 0, sizeof(m_data)); 40 } 41 set(unsigned index)42 void set(unsigned index) 43 { 44 ASSERT_WITH_SECURITY_IMPLICATION(index < arraySize); 45 m_data[index / 8] |= 1 << (index & 7); 46 } 47 clear(unsigned index)48 void clear(unsigned index) 49 { 50 ASSERT_WITH_SECURITY_IMPLICATION(index < arraySize); 51 m_data[index / 8] &= ~(1 << (index & 7)); 52 } 53 get(unsigned index)54 bool get(unsigned index) const 55 { 56 ASSERT_WITH_SECURITY_IMPLICATION(index < arraySize); 57 return !!(m_data[index / 8] & (1 << (index & 7))); 58 } 59 60 private: 61 unsigned char m_data[arraySize / 8 + 1]; 62 }; 63 64 } // namespace WTF 65 66 using WTF::BitArray; 67 68 #endif // BitArray_h 69