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/*
* Copyright (C) 2007-2024 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/text/LChar.h>
namespace WTF {
namespace Unicode {
enum class ConversionResultCode : uint8_t {
Success, // conversion successful
SourceInvalid, // source sequence is invalid/malformed
TargetExhausted // insufficient room in target for conversion
};
template<typename CharacterType> struct ConversionResult {
ConversionResultCode code { };
std::span<CharacterType> buffer { };
bool isAllASCII { };
};
WTF_EXPORT_PRIVATE ConversionResult<char16_t> convert(std::span<const char8_t>, std::span<char16_t>);
WTF_EXPORT_PRIVATE ConversionResult<char8_t> convert(std::span<const char16_t>, std::span<char8_t>);
WTF_EXPORT_PRIVATE ConversionResult<char8_t> convert(std::span<const LChar>, std::span<char8_t>);
// Invalid sequences are converted to the replacement character.
WTF_EXPORT_PRIVATE ConversionResult<char16_t> convertReplacingInvalidSequences(std::span<const char8_t>, std::span<char16_t>);
WTF_EXPORT_PRIVATE ConversionResult<char8_t> convertReplacingInvalidSequences(std::span<const char16_t>, std::span<char8_t>);
WTF_EXPORT_PRIVATE bool equal(std::span<const char16_t>, std::span<const char8_t>);
WTF_EXPORT_PRIVATE bool equal(std::span<const LChar>, std::span<const char8_t>);
// The checkUTF8 function checks the UTF-8 and returns a span of the valid complete
// UTF-8 sequences at the start of the passed-in characters, along with the UTF-16
// length and an indication if all were ASCII.
struct CheckedUTF8 {
std::span<const char8_t> characters { };
size_t lengthUTF16 { };
bool isAllASCII { };
};
WTF_EXPORT_PRIVATE CheckedUTF8 checkUTF8(std::span<const char8_t>);
// The computeUTF16LengthWithHash function returns a length and hash of 0 if the
// source is exhausted or invalid. The hash is of the computeHashAndMaskTop8Bits variety.
struct UTF16LengthWithHash {
size_t lengthUTF16 { };
unsigned hash { };
};
WTF_EXPORT_PRIVATE UTF16LengthWithHash computeUTF16LengthWithHash(std::span<const char8_t>);
} // namespace Unicode
} // namespace WTF
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