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/*
* Copyright (C) 2023 Apple Inc. All rights reserved.
*
* 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 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 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.
*/
#pragma once
#include <wtf/Compiler.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace WTF {
#if CPU(NEEDS_ALIGNED_ACCESS)
#define COMPARE_2CHARS(address, char1, char2) \
(((address)[0] == char1) && ((address)[1] == char2))
#define COMPARE_4CHARS(address, char1, char2, char3, char4) \
(COMPARE_2CHARS(address, char1, char2) && COMPARE_2CHARS((address) + 2, char3, char4))
#define COMPARE_2UCHARS(address, char1, char2) \
(((address)[0] == char1) && ((address)[1] == char2))
#define COMPARE_4UCHARS(address, char1, char2, char3, char4) \
(COMPARE_2UCHARS(address, char1, char2) && COMPARE_2UCHARS((address) + 2, char3, char4))
#else // CPU(NEEDS_ALIGNED_ACCESS)
#if CPU(BIG_ENDIAN)
#define CHARPAIR_TOUINT16(a, b) \
((((uint16_t)(a)) << 8) + (uint16_t)(b))
#define CHARQUAD_TOUINT32(a, b, c, d) \
((((uint32_t)(CHARPAIR_TOUINT16(a, b))) << 16) + CHARPAIR_TOUINT16(c, d))
#define UCHARPAIR_TOUINT32(a, b) \
((((uint32_t)(a)) << 16) + (uint32_t)(b))
#define UCHARQUAD_TOUINT64(a, b, c, d) \
((((uint64_t)(UCHARQUAD_TOUINT64(a, b))) << 32) + UCHARPAIR_TOUINT32(c, d))
#else // CPU(BIG_ENDIAN)
#define CHARPAIR_TOUINT16(a, b) \
((((uint16_t)(b)) << 8) + (uint16_t)(a))
#define CHARQUAD_TOUINT32(a, b, c, d) \
((((uint32_t)(CHARPAIR_TOUINT16(c, d))) << 16) + CHARPAIR_TOUINT16(a, b))
#define UCHARPAIR_TOUINT32(a, b) \
((((uint32_t)(b)) << 16) + (uint32_t)(a))
#define UCHARQUAD_TOUINT64(a, b, c, d) \
((((uint64_t)(UCHARPAIR_TOUINT32(c, d))) << 32) + UCHARPAIR_TOUINT32(a, b))
#endif // CPU(BIG_ENDIAN)
#define COMPARE_2CHARS(address, char1, char2) \
((reinterpret_cast_ptr<const uint16_t*>(address))[0] == CHARPAIR_TOUINT16(char1, char2))
#define COMPARE_2UCHARS(address, char1, char2) \
((reinterpret_cast_ptr<const uint32_t*>(address))[0] == UCHARPAIR_TOUINT32(char1, char2))
#if CPU(X86_64) || CPU(ARM64)
#define COMPARE_4CHARS(address, char1, char2, char3, char4) \
((reinterpret_cast_ptr<const uint32_t*>(address))[0] == CHARQUAD_TOUINT32(char1, char2, char3, char4))
#define COMPARE_4UCHARS(address, char1, char2, char3, char4) \
((reinterpret_cast_ptr<const uint64_t*>(address))[0] == UCHARQUAD_TOUINT64(char1, char2, char3, char4))
#else // CPU(X86_64) || CPU(ARM64)
#define COMPARE_4CHARS(address, char1, char2, char3, char4) \
(COMPARE_2CHARS(address, char1, char2) && COMPARE_2CHARS((address) + 2, char3, char4))
#define COMPARE_4UCHARS(address, char1, char2, char3, char4) \
(COMPARE_2UCHARS(address, char1, char2) && COMPARE_2UCHARS((address) + 2, char3, char4))
#endif // CPU(X86_64) || CPU(ARM64)
#endif // CPU(NEEDS_ALIGNED_ACCESS)
#define COMPARE_3CHARS(address, char1, char2, char3) \
(COMPARE_2CHARS(address, char1, char2) && ((address)[2] == (char3)))
#define COMPARE_3UCHARS(address, char1, char2, char3) \
(COMPARE_2UCHARS(address, char1, char2) && ((address)[2] == (char3)))
#define COMPARE_5CHARS(address, char1, char2, char3, char4, char5) \
(COMPARE_4CHARS(address, char1, char2, char3, char4) && ((address)[4] == (char5)))
#define COMPARE_5UCHARS(address, char1, char2, char3, char4, char5) \
(COMPARE_4UCHARS(address, char1, char2, char3, char4) && ((address)[4] == (char5)))
#define COMPARE_6CHARS(address, char1, char2, char3, char4, char5, char6) \
(COMPARE_4CHARS(address, char1, char2, char3, char4) && COMPARE_2CHARS(address + 4, char5, char6))
#define COMPARE_6UCHARS(address, char1, char2, char3, char4, char5, char6) \
(COMPARE_4UCHARS(address, char1, char2, char3, char4) && COMPARE_2UCHARS(address + 4, char5, char6))
#define COMPARE_7CHARS(address, char1, char2, char3, char4, char5, char6, char7) \
(COMPARE_4CHARS(address, char1, char2, char3, char4) && COMPARE_4CHARS(address + 3, char4, char5, char6, char7))
#define COMPARE_7UCHARS(address, char1, char2, char3, char4, char5, char6, char7) \
(COMPARE_4UCHARS(address, char1, char2, char3, char4) && COMPARE_4UCHARS(address + 3, char4, char5, char6, char7))
#define COMPARE_8CHARS(address, char1, char2, char3, char4, char5, char6, char7, char8) \
(COMPARE_4CHARS(address, char1, char2, char3, char4) && COMPARE_4CHARS(address + 4, char5, char6, char7, char8))
#define COMPARE_8UCHARS(address, char1, char2, char3, char4, char5, char6, char7, char8) \
(COMPARE_4UCHARS(address, char1, char2, char3, char4) && COMPARE_4UCHARS(address + 4, char5, char6, char7, char8))
template<typename CharacterType>
ALWAYS_INLINE static bool compareCharacters(const CharacterType* source, char c0, char c1)
{
if constexpr (sizeof(CharacterType) == 1)
return COMPARE_2CHARS(source, c0, c1);
else
return COMPARE_2UCHARS(source, c0, c1);
}
template<typename CharacterType>
ALWAYS_INLINE static bool compareCharacters(const CharacterType* source, char c0, char c1, char c2)
{
if constexpr (sizeof(CharacterType) == 1)
return COMPARE_3CHARS(source, c0, c1, c2);
else
return COMPARE_3UCHARS(source, c0, c1, c2);
}
template<typename CharacterType>
ALWAYS_INLINE static bool compareCharacters(const CharacterType* source, char c0, char c1, char c2, char c3)
{
if constexpr (sizeof(CharacterType) == 1)
return COMPARE_4CHARS(source, c0, c1, c2, c3);
else
return COMPARE_4UCHARS(source, c0, c1, c2, c3);
}
template<typename CharacterType>
ALWAYS_INLINE static bool compareCharacters(const CharacterType* source, char c0, char c1, char c2, char c3, char c4)
{
if constexpr (sizeof(CharacterType) == 1)
return COMPARE_5CHARS(source, c0, c1, c2, c3, c4);
else
return COMPARE_5UCHARS(source, c0, c1, c2, c3, c4);
}
template<typename CharacterType>
ALWAYS_INLINE static bool compareCharacters(const CharacterType* source, char c0, char c1, char c2, char c3, char c4, char c5)
{
if constexpr (sizeof(CharacterType) == 1)
return COMPARE_6CHARS(source, c0, c1, c2, c3, c4, c5);
else
return COMPARE_6UCHARS(source, c0, c1, c2, c3, c4, c5);
}
template<typename CharacterType>
ALWAYS_INLINE static bool compareCharacters(const CharacterType* source, char c0, char c1, char c2, char c3, char c4, char c5, char c6)
{
if constexpr (sizeof(CharacterType) == 1)
return COMPARE_7CHARS(source, c0, c1, c2, c3, c4, c5, c6);
else
return COMPARE_7UCHARS(source, c0, c1, c2, c3, c4, c5, c6);
}
template<typename CharacterType>
ALWAYS_INLINE static bool compareCharacters(const CharacterType* source, char c0, char c1, char c2, char c3, char c4, char c5, char c6, char c7)
{
if constexpr (sizeof(CharacterType) == 1)
return COMPARE_8CHARS(source, c0, c1, c2, c3, c4, c5, c6, c7);
else
return COMPARE_8UCHARS(source, c0, c1, c2, c3, c4, c5, c6, c7);
}
#undef COMPARE_2CHARS
#undef COMPARE_2UCHARS
#undef COMPARE_3CHARS
#undef COMPARE_3UCHARS
#undef COMPARE_4CHARS
#undef COMPARE_4UCHARS
#undef COMPARE_5CHARS
#undef COMPARE_5UCHARS
#undef COMPARE_6CHARS
#undef COMPARE_6UCHARS
#undef COMPARE_7CHARS
#undef COMPARE_7UCHARS
#undef COMPARE_8CHARS
#undef COMPARE_8UCHARS
#undef CHARPAIR_TOUINT16
#undef CHARQUAD_TOUINT32
#undef UCHARPAIR_TOUINT32
#undef UCHARQUAD_TOUINT64
} // namespace WTF
using WTF::compareCharacters;
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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