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/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
* Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 TextCodecASCIIFastPath_h
#define TextCodecASCIIFastPath_h
#include <stdint.h>
namespace WebCore {
// Assuming that a pointer is the size of a "machine word", then
// uintptr_t is an integer type that is also a machine word.
typedef uintptr_t MachineWord;
// This constant has type uintptr_t since we will use it to align
// pointers. Not because MachineWord is uintptr_t.
const uintptr_t machineWordAlignmentMask = sizeof(MachineWord) - 1;
template<size_t size> struct NonASCIIMask;
template<> struct NonASCIIMask<4> {
static unsigned value() { return 0x80808080U; }
};
template<> struct NonASCIIMask<8> {
static unsigned long long value() { return 0x8080808080808080ULL; }
};
template<size_t size> struct UCharByteFiller;
template<> struct UCharByteFiller<4> {
static void copy(UChar* destination, const uint8_t* source)
{
destination[0] = source[0];
destination[1] = source[1];
destination[2] = source[2];
destination[3] = source[3];
}
};
template<> struct UCharByteFiller<8> {
static void copy(UChar* destination, const uint8_t* source)
{
destination[0] = source[0];
destination[1] = source[1];
destination[2] = source[2];
destination[3] = source[3];
destination[4] = source[4];
destination[5] = source[5];
destination[6] = source[6];
destination[7] = source[7];
}
};
inline bool isAllASCII(MachineWord word)
{
return !(word & NonASCIIMask<sizeof(MachineWord)>::value());
}
inline void copyASCIIMachineWord(UChar* destination, const uint8_t* source)
{
UCharByteFiller<sizeof(MachineWord)>::copy(destination, source);
}
inline bool isAlignedToMachineWord(const void* pointer)
{
return !(reinterpret_cast<uintptr_t>(pointer) & machineWordAlignmentMask);
}
template<typename T> inline T* alignToMachineWord(T* pointer)
{
return reinterpret_cast<T*>(reinterpret_cast<uintptr_t>(pointer) & ~machineWordAlignmentMask);
}
} // namespace WebCore
#endif // TextCodecASCIIFastPath_h
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