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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/react-native/ReactCommon/jsinspector-modern
Просмотр файла: Utf8.h
/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#pragma once
#include <vector>
namespace facebook::react::jsinspector_modern {
/**
* Takes a vector of bytes representing a fragment of a UTF-8 string, and
* removes the minimum number (0-3) of trailing bytes so that the remainder is
* valid UTF-8. Useful for slicing binary data into UTF-8 strings.
*
* \param buffer Buffer to operate on - will be resized if necessary.
*/
inline void truncateToValidUTF8(std::vector<char>& buffer) {
const auto length = buffer.size();
// Ensure we don't cut a UTF-8 code point in the middle by removing any
// trailing bytes representing an incomplete UTF-8 code point.
// If the last byte is a UTF-8 first byte or continuation byte (topmost bit
// is 1) (otherwise the last char is ASCII and we don't need to do
// anything).
if (length > 0 && (buffer[length - 1] & 0b10000000) == 0b10000000) {
int continuationBytes = 0;
// Find the first byte of the UTF-8 code point (topmost bits 11) and count
// the number of continuation bytes following it.
while ((buffer[length - continuationBytes - 1] & 0b11000000) !=
0b11000000) {
continuationBytes++;
if (continuationBytes > 3 || continuationBytes >= length - 1) {
throw std::runtime_error("Invalid UTF-8 sequence");
}
}
char firstByteOfSequence = buffer[length - continuationBytes - 1];
// Check for the special case that our original cut point was at the end
// of a UTF-8 code-point, and therefore already valid. This will be the
// case if the first byte indicates continuationBytes continuation bytes
// should follow, i.e. its top bits are (1+continuationBytes) 1's followed
// by a 0.
char mask = static_cast<char>(0b11111000 << (3 - continuationBytes));
char expectedBitsAfterMask = static_cast<char>(mask << 1);
if (continuationBytes == 0 ||
(firstByteOfSequence & mask) != expectedBitsAfterMask) {
// Remove the trailing continuation bytes, if any, and the first byte.
buffer.resize(length - (continuationBytes + 1));
}
}
}
} // namespace facebook::react::jsinspector_modern
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