1 /* 2 * Copyright (C) 2009 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 ByteArray_h 27 #define ByteArray_h 28 29 #include <wtf/PassRefPtr.h> 30 #include <wtf/RefCounted.h> 31 32 namespace WTF { 33 class ByteArray : public RefCountedBase { 34 public: length()35 unsigned length() const { return m_size; } 36 set(unsigned index,double value)37 void set(unsigned index, double value) 38 { 39 if (index >= m_size) 40 return; 41 if (!(value > 0)) // Clamp NaN to 0 42 value = 0; 43 else if (value > 255) 44 value = 255; 45 m_data[index] = static_cast<unsigned char>(value + 0.5); 46 } 47 set(unsigned index,unsigned char value)48 void set(unsigned index, unsigned char value) 49 { 50 if (index >= m_size) 51 return; 52 m_data[index] = value; 53 } 54 get(unsigned index,unsigned char & result)55 bool get(unsigned index, unsigned char& result) const 56 { 57 if (index >= m_size) 58 return false; 59 result = m_data[index]; 60 return true; 61 } 62 get(unsigned index)63 unsigned char get(unsigned index) const 64 { 65 ASSERT(index < m_size); 66 return m_data[index]; 67 } 68 data()69 unsigned char* data() { return m_data; } 70 deref()71 void deref() 72 { 73 if (derefBase()) { 74 // We allocated with new unsigned char[] in create(), 75 // and then used placement new to construct the object. 76 this->~ByteArray(); 77 delete[] reinterpret_cast<unsigned char*>(this); 78 } 79 } 80 81 static PassRefPtr<ByteArray> create(size_t size); 82 83 private: ByteArray(size_t size)84 ByteArray(size_t size) 85 : m_size(size) 86 { 87 } 88 size_t m_size; 89 unsigned char m_data[sizeof(size_t)]; 90 }; 91 } 92 93 #endif 94