TextCodecASCIIFastPath.h [plain text]
#ifndef TextCodecASCIIFastPath_h
#define TextCodecASCIIFastPath_h
#include <stdint.h>
namespace WebCore {
typedef uintptr_t MachineWord;
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);
}
}
#endif // TextCodecASCIIFastPath_h