ffd8c8c505
Add new validate_with_error_position function which returns -1 if data is a valid UTF-8 string or otherwise a byte position of first invalid character. The position is added to exception messages of all UTF-8 parsing errors in Scylla. validate_with_error_position is done in two passes in order to preserve the same performance in common case when the string is valid.
57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
/*
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* Leverage SIMD for fast UTF-8 validation with range base algorithm.
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* Details at https://github.com/cyb70289/utf8/.
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*
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* Copyright (c) 2018, Arm Limited and affiliates. All rights reserved.
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <cstdint>
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#include "bytes.hh"
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namespace utils {
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namespace utf8 {
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bool validate(const uint8_t *data, size_t len);
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inline bool validate(bytes_view string) {
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const uint8_t *data = reinterpret_cast<const uint8_t*>(string.data());
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size_t len = string.size();
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return validate(data, len);
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}
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// If data represents a correct UTF-8 string, return std::nullopt,
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// otherwise return a position of first error byte.
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std::optional<size_t> validate_with_error_position(const uint8_t *data, size_t len);
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inline std::optional<size_t> validate_with_error_position(bytes_view string) {
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const uint8_t *data = reinterpret_cast<const uint8_t*>(string.data());
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size_t len = string.size();
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return validate_with_error_position(data, len);
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}
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} // namespace utf8
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} // namespace utils
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