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 <limits.h> 30#include <wtf/PassRefPtr.h> 31#include <wtf/Platform.h> 32#include <wtf/RefCounted.h> 33 34namespace WTF { 35 class ByteArray : public RefCountedBase { 36 public: 37 unsigned length() const { return m_size; } 38 39 void set(unsigned index, double value) 40 { 41 if (index >= m_size) 42 return; 43 if (!(value > 0)) // Clamp NaN to 0 44 value = 0; 45 else if (value > 255) 46 value = 255; 47 m_data[index] = static_cast<unsigned char>(value + 0.5); 48 } 49 50 void set(unsigned index, unsigned char value) 51 { 52 if (index >= m_size) 53 return; 54 m_data[index] = value; 55 } 56 57 bool get(unsigned index, unsigned char& result) const 58 { 59 if (index >= m_size) 60 return false; 61 result = m_data[index]; 62 return true; 63 } 64 65 unsigned char get(unsigned index) const 66 { 67 ASSERT(index < m_size); 68 return m_data[index]; 69 } 70 71 unsigned char* data() { return m_data; } 72 73 void deref() 74 { 75 if (derefBase()) { 76 // We allocated with new unsigned char[] in create(), 77 // and then used placement new to construct the object. 78 this->~ByteArray(); 79 delete[] reinterpret_cast<unsigned char*>(this); 80 } 81 } 82 83 static PassRefPtr<ByteArray> create(size_t size); 84 85 private: 86 ByteArray(size_t size) 87 : m_size(size) 88 { 89 } 90 size_t m_size; 91// MSVC can't handle correctly unsized array. 92// warning C4200: nonstandard extension used : zero-sized array in struct/union 93// Cannot generate copy-ctor or copy-assignment operator when UDT contains a zero-sized array 94#if COMPILER(MSVC) 95 unsigned char m_data[INT_MAX]; 96#else 97 unsigned char m_data[]; 98#endif 99 }; 100} // namespace WTF 101 102using WTF::ByteArray; 103 104#endif 105