1 /* 2 * Copyright (C) 2011 Apple Inc. All rights reserved. 3 * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef TextCodecASCIIFastPath_h 28 #define TextCodecASCIIFastPath_h 29 30 #include <stdint.h> 31 32 namespace WebCore { 33 34 // Assuming that a pointer is the size of a "machine word", then 35 // uintptr_t is an integer type that is also a machine word. 36 typedef uintptr_t MachineWord; 37 38 // This constant has type uintptr_t since we will use it to align 39 // pointers. Not because MachineWord is uintptr_t. 40 const uintptr_t machineWordAlignmentMask = sizeof(MachineWord) - 1; 41 42 template<size_t size> struct NonASCIIMask; 43 template<> struct NonASCIIMask<4> { 44 static unsigned value() { return 0x80808080U; } 45 }; 46 template<> struct NonASCIIMask<8> { 47 static unsigned long long value() { return 0x8080808080808080ULL; } 48 }; 49 50 template<size_t size> struct UCharByteFiller; 51 template<> struct UCharByteFiller<4> { 52 static void copy(UChar* destination, const uint8_t* source) 53 { 54 destination[0] = source[0]; 55 destination[1] = source[1]; 56 destination[2] = source[2]; 57 destination[3] = source[3]; 58 } 59 }; 60 template<> struct UCharByteFiller<8> { 61 static void copy(UChar* destination, const uint8_t* source) 62 { 63 destination[0] = source[0]; 64 destination[1] = source[1]; 65 destination[2] = source[2]; 66 destination[3] = source[3]; 67 destination[4] = source[4]; 68 destination[5] = source[5]; 69 destination[6] = source[6]; 70 destination[7] = source[7]; 71 } 72 }; 73 74 inline bool isAllASCII(MachineWord word) 75 { 76 return !(word & NonASCIIMask<sizeof(MachineWord)>::value()); 77 } 78 79 inline void copyASCIIMachineWord(UChar* destination, const uint8_t* source) 80 { 81 UCharByteFiller<sizeof(MachineWord)>::copy(destination, source); 82 } 83 84 inline bool isAlignedToMachineWord(const void* pointer) 85 { 86 return !(reinterpret_cast<uintptr_t>(pointer) & machineWordAlignmentMask); 87 } 88 89 template<typename T> inline T* alignToMachineWord(T* pointer) 90 { 91 return reinterpret_cast<T*>(reinterpret_cast<uintptr_t>(pointer) & ~machineWordAlignmentMask); 92 } 93 94 } // namespace WebCore 95 96 #endif // TextCodecASCIIFastPath_h 97
